diff options
Diffstat (limited to 'arch')
91 files changed, 639 insertions, 1665 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 15ac18a56c93..20b688c81956 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -7,6 +7,8 @@ config ARM64 select GENERIC_IOMAP select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW + select GENERIC_KERNEL_EXECVE + select GENERIC_KERNEL_THREAD select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select HARDIRQS_SW_RESEND diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 77f696c14339..ab239b2c456f 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -128,11 +128,6 @@ unsigned long get_wchan(struct task_struct *p); extern struct task_struct *cpu_switch_to(struct task_struct *prev, struct task_struct *next); -/* - * Create a new kernel thread - */ -extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); - #define task_pt_regs(p) \ ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) diff --git a/arch/arm64/include/asm/syscalls.h b/arch/arm64/include/asm/syscalls.h index 09ff33572aab..a1b00cd6f786 100644 --- a/arch/arm64/include/asm/syscalls.h +++ b/arch/arm64/include/asm/syscalls.h @@ -23,18 +23,16 @@ /* * System call wrappers implemented in kernel/entry.S. */ -asmlinkage long sys_execve_wrapper(const char __user *filename, - const char __user *const __user *argv, - const char __user *const __user *envp); -asmlinkage long sys_clone_wrapper(unsigned long clone_flags, - unsigned long newsp, - void __user *parent_tid, - unsigned long tls_val, - void __user *child_tid); asmlinkage long sys_rt_sigreturn_wrapper(void); asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss, stack_t __user *uoss); +/* + * AArch64 sys_clone implementation has a different prototype than the generic + * one (additional TLS value argument). + */ +#define sys_clone sys_clone + #include <asm-generic/syscalls.h> #endif /* __ASM_SYSCALLS_H */ diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index 68aff2816e86..43064a8bd99e 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -25,4 +25,5 @@ #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_COMPAT_SYS_SENDFILE #endif +#define __ARCH_WANT_SYS_EXECVE #include <uapi/asm/unistd.h> diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 6d909faebf28..d9850cf9870d 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -23,7 +23,7 @@ __SYSCALL(0, sys_restart_syscall) __SYSCALL(1, sys_exit) -__SYSCALL(2, compat_sys_fork_wrapper) +__SYSCALL(2, compat_sys_fork) __SYSCALL(3, sys_read) __SYSCALL(4, sys_write) __SYSCALL(5, compat_sys_open) @@ -32,7 +32,7 @@ __SYSCALL(7, sys_ni_syscall) /* 7 was sys_waitpid */ __SYSCALL(8, sys_creat) __SYSCALL(9, sys_link) __SYSCALL(10, sys_unlink) -__SYSCALL(11, compat_sys_execve_wrapper) +__SYSCALL(11, compat_sys_execve) __SYSCALL(12, sys_chdir) __SYSCALL(13, sys_ni_syscall) /* 13 was sys_time */ __SYSCALL(14, sys_mknod) @@ -141,7 +141,7 @@ __SYSCALL(116, compat_sys_sysinfo) __SYSCALL(117, sys_ni_syscall) /* 117 was sys_ipc */ __SYSCALL(118, sys_fsync) __SYSCALL(119, compat_sys_sigreturn_wrapper) -__SYSCALL(120, compat_sys_clone_wrapper) +__SYSCALL(120, sys_clone) __SYSCALL(121, sys_setdomainname) __SYSCALL(122, sys_newuname) __SYSCALL(123, sys_ni_syscall) /* 123 was sys_modify_ldt */ @@ -211,7 +211,7 @@ __SYSCALL(186, compat_sys_sigaltstack_wrapper) __SYSCALL(187, compat_sys_sendfile) __SYSCALL(188, sys_ni_syscall) /* 188 reserved */ __SYSCALL(189, sys_ni_syscall) /* 189 reserved */ -__SYSCALL(190, compat_sys_vfork_wrapper) +__SYSCALL(190, compat_sys_vfork) __SYSCALL(191, compat_sys_getrlimit) /* SuS compliant getrlimit */ __SYSCALL(192, sys_mmap_pgoff) __SYSCALL(193, compat_sys_truncate64_wrapper) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index a6f3f7da6880..cbfa4d28100e 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -594,7 +594,7 @@ work_resched: /* * "slow" syscall return path. */ -ENTRY(ret_to_user) +ret_to_user: disable_irq // disable interrupts ldr x1, [tsk, #TI_FLAGS] and x2, x1, #_TIF_WORK_MASK @@ -611,7 +611,10 @@ ENDPROC(ret_to_user) */ ENTRY(ret_from_fork) bl schedule_tail - get_thread_info tsk + cbz x19, 1f // not a kernel thread + mov x0, x20 + blr x19 +1: get_thread_info tsk b ret_to_user ENDPROC(ret_from_fork) @@ -673,16 +676,6 @@ __sys_trace_return: /* * Special system call wrappers. */ -ENTRY(sys_execve_wrapper) - mov x3, sp - b sys_execve -ENDPROC(sys_execve_wrapper) - -ENTRY(sys_clone_wrapper) - mov x5, sp - b sys_clone -ENDPROC(sys_clone_wrapper) - ENTRY(sys_rt_sigreturn_wrapper) mov x0, sp b sys_rt_sigreturn diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index e04cebdbb47f..8a5f3341861e 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -240,27 +240,41 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start, struct pt_regs *childregs = task_pt_regs(p); unsigned long tls = p->thread.tp_value; - *childregs = *regs; - childregs->regs[0] = 0; + memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context)); - if (is_compat_thread(task_thread_info(p))) - childregs->compat_sp = stack_start; - else { + if (likely(regs)) { + *childregs = *regs; + childregs->regs[0] = 0; + if (is_compat_thread(task_thread_info(p))) { + if (stack_start) + childregs->compat_sp = stack_start; + } else { + /* + * Read the current TLS pointer from tpidr_el0 as it may be + * out-of-sync with the saved value. + */ + asm("mrs %0, tpidr_el0" : "=r" (tls)); + if (stack_start) { + /* 16-byte aligned stack mandatory on AArch64 */ + if (stack_start & 15) + return -EINVAL; + childregs->sp = stack_start; + } + } /* - * Read the current TLS pointer from tpidr_el0 as it may be - * out-of-sync with the saved value. + * If a TLS pointer was passed to clone (4th argument), use it + * for the new thread. */ - asm("mrs %0, tpidr_el0" : "=r" (tls)); - childregs->sp = stack_start; + if (clone_flags & CLONE_SETTLS) + tls = regs->regs[3]; + } else { + memset(childregs, 0, sizeof(struct pt_regs)); + childregs->pstate = PSR_MODE_EL1h; + p->thread.cpu_context.x19 = stack_start; + p->thread.cpu_context.x20 = stk_sz; } - - memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context)); - p->thread.cpu_context.sp = (unsigned long)childregs; p->thread.cpu_context.pc = (unsigned long)ret_from_fork; - - /* If a TLS pointer was passed to clone, use that for the new thread. */ - if (clone_flags & CLONE_SETTLS) - tls = regs->regs[3]; + p->thread.cpu_context.sp = (unsigned long)childregs; p->thread.tp_value = tls; ptrace_hw_copy_thread(p); @@ -309,43 +323,6 @@ struct task_struct *__switch_to(struct task_struct *prev, return last; } -/* - * Shuffle the argument into the correct register before calling the - * thread function. x1 is the thread argument, x2 is the pointer to - * the thread function, and x3 points to the exit function. - */ -extern void kernel_thread_helper(void); -asm( ".section .text\n" -" .align\n" -" .type kernel_thread_helper, #function\n" -"kernel_thread_helper:\n" -" mov x0, x1\n" -" mov x30, x3\n" -" br x2\n" -" .size kernel_thread_helper, . - kernel_thread_helper\n" -" .previous"); - -#define kernel_thread_exit do_exit - -/* - * Create a kernel thread. - */ -pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - - regs.regs[1] = (unsigned long)arg; - regs.regs[2] = (unsigned long)fn; - regs.regs[3] = (unsigned long)kernel_thread_exit; - regs.pc = (unsigned long)kernel_thread_helper; - regs.pstate = PSR_MODE_EL1h; - - return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - unsigned long get_wchan(struct task_struct *p) { struct stackframe frame; diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c index b120df37de35..4364df85050e 100644 --- a/arch/arm64/kernel/sys.c +++ b/arch/arm64/kernel/sys.c @@ -31,79 +31,11 @@ */ asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp, int __user *parent_tidptr, unsigned long tls_val, - int __user *child_tidptr, struct pt_regs *regs) + int __user *child_tidptr) { - if (!newsp) - newsp = regs->sp; - /* 16-byte aligned stack mandatory on AArch64 */ - if (newsp & 15) - return -EINVAL; - return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); -} - -/* - * sys_execve() executes a new program. - */ -asmlinkage long sys_execve(const char __user *filenamei, - const char __user *const __user *argv, - const char __user *const __user *envp, - struct pt_regs *regs) -{ - long error; - struct filename *filename; - - filename = getname(filenamei); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, argv, envp, regs); - putname(filename); -out: - return error; -} - -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - struct pt_regs regs; - int ret; - - memset(®s, 0, sizeof(struct pt_regs)); - ret = do_execve(filename, - (const char __user *const __user *)argv, - (const char __user *const __user *)envp, ®s); - if (ret < 0) - goto out; - - /* - * Save argc to the register structure for userspace. - */ - regs.regs[0] = ret; - - /* - * We were successful. We won't be returning to our caller, but - * instead to user space by manipulating the kernel stack. - */ - asm( "add x0, %0, %1\n\t" - "mov x1, %2\n\t" - "mov x2, %3\n\t" - "bl memmove\n\t" /* copy regs to top of stack */ - "mov x27, #0\n\t" /* not a syscall */ - "mov x28, %0\n\t" /* thread structure */ - "mov sp, x0\n\t" /* reposition stack pointer */ - "b ret_to_user" - : - : "r" (current_thread_info()), - "Ir" (THREAD_START_SP - sizeof(regs)), - "r" (®s), - "Ir" (sizeof(regs)) - : "x0", "x1", "x2", "x27", "x28", "x30", "memory"); - - out: - return ret; + return do_fork(clone_flags, newsp, current_pt_regs(), 0, + parent_tidptr, child_tidptr); } -EXPORT_SYMBOL(kernel_execve); asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, @@ -118,8 +50,6 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len, /* * Wrappers to pass the pt_regs argument. */ -#define sys_execve sys_execve_wrapper -#define sys_clone sys_clone_wrapper #define sys_rt_sigreturn sys_rt_sigreturn_wrapper #define sys_sigaltstack sys_sigaltstack_wrapper diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S index 54c4aec47a08..7ef59e9245ef 100644 --- a/arch/arm64/kernel/sys32.S +++ b/arch/arm64/kernel/sys32.S @@ -26,25 +26,6 @@ /* * System call wrappers for the AArch32 compatibility layer. */ -compat_sys_fork_wrapper: - mov x0, sp - b compat_sys_fork -ENDPROC(compat_sys_fork_wrapper) - -compat_sys_vfork_wrapper: - mov x0, sp - b compat_sys_vfork -ENDPROC(compat_sys_vfork_wrapper) - -compat_sys_execve_wrapper: - mov x3, sp - b compat_sys_execve -ENDPROC(compat_sys_execve_wrapper) - -compat_sys_clone_wrapper: - mov x5, sp - b compat_sys_clone -ENDPROC(compat_sys_clone_wrapper) compat_sys_sigreturn_wrapper: mov x0, sp diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c index 906e3bd270b0..6fabc1912da0 100644 --- a/arch/arm64/kernel/sys_compat.c +++ b/arch/arm64/kernel/sys_compat.c @@ -28,43 +28,15 @@ #include <asm/cacheflush.h> #include <asm/unistd32.h> -asmlinkage int compat_sys_fork(struct pt_regs *regs) +asmlinkage int compat_sys_fork(void) { - return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL); + return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL); } -asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp, - int __user *parent_tidptr, int tls_val, - int __user *child_tidptr, struct pt_regs *regs) +asmlinkage int compat_sys_vfork(void) { - if (!newsp) - newsp = regs->compat_sp; - - return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); -} - -asmlinkage int compat_sys_vfork(struct pt_regs *regs) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp, - regs, 0, NULL, NULL); -} - -asmlinkage int compat_sys_execve(const char __user *filenamei, - compat_uptr_t argv, compat_uptr_t envp, - struct pt_regs *regs) -{ - int error; - struct filename *filename; - - filename = getname(filenamei); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = compat_do_execve(filename->name, compat_ptr(argv), - compat_ptr(envp), regs); - putname(filename); -out: - return error; + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, + current_pt_regs(), 0, NULL, NULL); } asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid, diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig index aee1b569ee6e..66eab3703c75 100644 --- a/arch/c6x/Kconfig +++ b/arch/c6x/Kconfig @@ -18,6 +18,7 @@ config C6X select OF_EARLY_FLATTREE select GENERIC_CLOCKEVENTS select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE select MODULES_USE_ELF_RELA config MMU diff --git a/arch/c6x/include/uapi/asm/unistd.h b/arch/c6x/include/uapi/asm/unistd.h index 4ff747d12dad..625beafb9cd1 100644 --- a/arch/c6x/include/uapi/asm/unistd.h +++ b/arch/c6x/include/uapi/asm/unistd.h @@ -14,7 +14,6 @@ * more details. */ -#define __ARCH_WANT_KERNEL_EXECVE #define __ARCH_WANT_SYS_EXECVE /* Use the standard ABI for syscalls. */ diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S index 5449c36018fe..75f6f36472cf 100644 --- a/arch/c6x/kernel/entry.S +++ b/arch/c6x/kernel/entry.S @@ -413,19 +413,9 @@ ENTRY(ret_from_kernel_thread) 0: B .S2 B10 /* call fn */ LDW .D2T1 *+SP(REGS_A1+8),A4 /* get arg */ - MVKL .S2 sys_exit,B11 - MVKH .S2 sys_exit,B11 - ADDKPC .S2 0f,B3,1 -0: - BNOP .S2 B11,5 /* jump to sys_exit */ + ADDKPC .S2 ret_from_fork_2,B3,3 ENDPROC(ret_from_kernel_thread) -ENTRY(ret_from_kernel_execve) - GET_THREAD_INFO A12 - BNOP .S2 syscall_exit,4 - ADD .D2X A4,-8,SP -ENDPROC(ret_from_kernel_execve) - ;; ;; These are the interrupt handlers, responsible for calling __do_IRQ() ;; int6 is used for syscalls (see _system_call entry) diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig index 0744f7d7b1fd..e418803b6c8e 100644 --- a/arch/hexagon/Kconfig +++ b/arch/hexagon/Kconfig @@ -31,6 +31,8 @@ config HEXAGON select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS_BROADCAST select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE ---help--- Qualcomm Hexagon is a processor architecture designed for high performance and low power across a wide variety of applications. diff --git a/arch/hexagon/include/asm/processor.h b/arch/hexagon/include/asm/processor.h index a03323ab9d44..6dd5d3706869 100644 --- a/arch/hexagon/include/asm/processor.h +++ b/arch/hexagon/include/asm/processor.h @@ -34,7 +34,6 @@ struct task_struct; /* this is defined in arch/process.c */ -extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long thread_saved_pc(struct task_struct *tsk); extern void start_thread(struct pt_regs *, unsigned long, unsigned long); diff --git a/arch/hexagon/include/uapi/asm/ptrace.h b/arch/hexagon/include/uapi/asm/ptrace.h index 8ef784047a74..1ffce0c6ee07 100644 --- a/arch/hexagon/include/uapi/asm/ptrace.h +++ b/arch/hexagon/include/uapi/asm/ptrace.h @@ -32,4 +32,8 @@ extern int regs_query_register_offset(const char *name); extern const char *regs_query_register_name(unsigned int offset); +#define current_pt_regs() \ + ((struct pt_regs *) \ + ((unsigned long)current_thread_info() + THREAD_SIZE) - 1) + #endif diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h index 81312d6a52e6..26b2e0f909c8 100644 --- a/arch/hexagon/include/uapi/asm/unistd.h +++ b/arch/hexagon/include/uapi/asm/unistd.h @@ -27,5 +27,6 @@ */ #define sys_mmap2 sys_mmap_pgoff +#define __ARCH_WANT_SYS_EXECVE #include <asm-generic/unistd.h> diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c index 9f6d7411b574..cfbc52bd5227 100644 --- a/arch/hexagon/kernel/process.c +++ b/arch/hexagon/kernel/process.c @@ -26,33 +26,6 @@ #include <linux/slab.h> /* - * Kernel thread creation. The desired kernel function is "wrapped" - * in the kernel_thread_helper function, which does cleanup - * afterwards. - */ -static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *)) -{ - do_exit(fn(arg)); -} - -int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - /* - * Yes, we're exploting illicit knowledge of the ABI here. - */ - regs.r00 = (unsigned long) arg; - regs.r01 = (unsigned long) fn; - pt_set_elr(®s, (unsigned long)kernel_thread_helper); - pt_set_kmode(®s); - - return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - -/* * Program thread launch. Often defined as a macro in processor.h, * but we're shooting for a small footprint and it's not an inner-loop * performance-critical operation. @@ -114,7 +87,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk) * Copy architecture-specific thread state */ int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, struct task_struct *p, + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct thread_info *ti = task_thread_info(p); @@ -125,61 +98,50 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, childregs = (struct pt_regs *) (((unsigned long) ti + THREAD_SIZE) - sizeof(*childregs)); - memcpy(childregs, regs, sizeof(*childregs)); ti->regs = childregs; /* * Establish kernel stack pointer and initial PC for new thread + * Note that unlike the usual situation, we do not copy the + * parent's callee-saved here; those are in pt_regs and whatever + * we leave here will be overridden on return to userland. */ ss = (struct hexagon_switch_stack *) ((unsigned long) childregs - sizeof(*ss)); ss->lr = (unsigned long)ret_from_fork; p->thread.switch_sp = ss; - - /* If User mode thread, set pt_reg stack pointer as per parameter */ - if (user_mode(childregs)) { - pt_set_rte_sp(childregs, usp); - - /* Child sees zero return value */ - childregs->r00 = 0; - - /* - * The clone syscall has the C signature: - * int [r0] clone(int flags [r0], - * void *child_frame [r1], - * void *parent_tid [r2], - * void *child_tid [r3], - * void *thread_control_block [r4]); - * ugp is used to provide TLS support. - */ - if (clone_flags & CLONE_SETTLS) - childregs->ugp = childregs->r04; - - /* - * Parent sees new pid -- not necessary, not even possible at - * this point in the fork process - * Might also want to set things like ti->addr_limit - */ - } else { - /* - * If kernel thread, resume stack is kernel stack base. - * Note that this is pointer arithmetic on pt_regs * - */ - pt_set_rte_sp(childregs, (unsigned long)(childregs + 1)); - /* - * We need the current thread_info fast path pointer - * set up in pt_regs. The register to be used is - * parametric for assembler code, but the mechanism - * doesn't drop neatly into C. Needs to be fixed. - */ - childregs->THREADINFO_REG = (unsigned long) ti; + if (unlikely(p->flags & PF_KTHREAD)) { + memset(childregs, 0, sizeof(struct pt_regs)); + /* r24 <- fn, r25 <- arg */ + ss->r2524 = usp | ((u64)arg << 32); + pt_set_kmode(childregs); + return 0; } + memcpy(childregs, regs, sizeof(*childregs)); + ss->r2524 = 0; + + pt_set_rte_sp(childregs, usp); + + /* Child sees zero return value */ + childregs->r00 = 0; + + /* + * The clone syscall has the C signature: + * int [r0] clone(int flags [r0], + * void *child_frame [r1], + * void *parent_tid [r2], + * void *child_tid [r3], + * void *thread_control_block [r4]); + * ugp is used to provide TLS support. + */ + if (clone_flags & CLONE_SETTLS) + childregs->ugp = childregs->r04; /* - * thread_info pointer is pulled out of task_struct "stack" - * field on switch_to. + * Parent sees new pid -- not necessary, not even possible at + * this point in the fork process + * Might also want to set things like ti->addr_limit */ - p->stack = (void *)ti; return 0; } diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c index 5047b8b879c0..fe0d1373165d 100644 --- a/arch/hexagon/kernel/signal.c +++ b/arch/hexagon/kernel/signal.c @@ -249,14 +249,14 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) */ asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) { - struct pt_regs *regs = current_thread_info()->regs; + struct pt_regs *regs = current_pt_regs(); return do_sigaltstack(uss, uoss, regs->r29); } asmlinkage int sys_rt_sigreturn(void) { - struct pt_regs *regs = current_thread_info()->regs; + struct pt_regs *regs = current_pt_regs(); struct rt_sigframe __user *frame; sigset_t blocked; diff --git a/arch/hexagon/kernel/syscall.c b/arch/hexagon/kernel/syscall.c index 319fa6494f58..d2cc3270af3e 100644 --- a/arch/hexagon/kernel/syscall.c +++ b/arch/hexagon/kernel/syscall.c @@ -35,55 +35,13 @@ * See signal.c for signal-related system call wrappers. */ -asmlinkage int sys_execve(char __user *ufilename, - const char __user *const __user *argv, - const char __user *const __user *envp) -{ - struct pt_regs *pregs = current_thread_info()->regs; - struct filename *filename; - int retval; - - filename = getname(ufilename); - retval = PTR_ERR(filename); - if (IS_ERR(filename)) - return retval; - - retval = do_execve(filename->name, argv, envp, pregs); - putname(filename); - - return retval; -} - asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, unsigned long parent_tidp, unsigned long child_tidp) { - struct pt_regs *pregs = current_thread_info()->regs; + struct pt_regs *pregs = current_pt_regs(); if (!newsp) newsp = pregs->SP; return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp, (int __user *)child_tidp); } - -/* - * Do a system call from the kernel, so as to have a proper pt_regs - * and recycle the sys_execvpe infrustructure. - */ -int kernel_execve(const char *filename, - const char *const argv[], const char *const envp[]) -{ - register unsigned long __a0 asm("r0") = (unsigned long) filename; - register unsigned long __a1 asm("r1") = (unsigned long) argv; - register unsigned long __a2 asm("r2") = (unsigned long) envp; - int retval; - - __asm__ volatile( - " R6 = #%4;\n" - " trap0(#1);\n" - " %0 = R0;\n" - : "=r" (retval) - : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) - ); - - return retval; -} diff --git a/arch/hexagon/kernel/vm_entry.S b/arch/hexagon/kernel/vm_entry.S index cd71673ac259..425e50c694f7 100644 --- a/arch/hexagon/kernel/vm_entry.S +++ b/arch/hexagon/kernel/vm_entry.S @@ -266,4 +266,8 @@ _K_enter_machcheck: .globl ret_from_fork ret_from_fork: call schedule_tail + P0 = cmp.eq(R24, #0); + if P0 jump return_from_syscall + R0 = R25; + callr R24 jump return_from_syscall diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 3279646120e3..670600468128 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -42,6 +42,8 @@ config IA64 select GENERIC_TIME_VSYSCALL_OLD select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE default y help The Itanium Processor Family is Intel's 64-bit successor to diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h index 944152a50912..e0a899a1a8a6 100644 --- a/arch/ia64/include/asm/processor.h +++ b/arch/ia64/include/asm/processor.h @@ -340,22 +340,6 @@ struct task_struct; */ #define release_thread(dead_task) -/* - * This is the mechanism for creating a new kernel thread. - * - * NOTE 1: Only a kernel-only process (ie the swapper or direct - * descendants who haven't done an "execve()") should use this: it - * will work within a system call from a "real" process, but the - * process memory space will not be free'd until both the parent and - * the child have exited. - * - * NOTE 2: This MUST NOT be an inlined function. Otherwise, we get - * into trouble in init/main.c when the child thread returns to - * do_basic_setup() and the timing is such that free_initmem() has - * been called already. - */ -extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags); - /* Get wait channel for task P. */ extern unsigned long get_wchan (struct task_struct *p); diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h index 8b3ff2f5b861..1574bca86138 100644 --- a/arch/ia64/include/asm/unistd.h +++ b/arch/ia64/include/asm/unistd.h @@ -29,6 +29,7 @@ #define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGSUSPEND +#define __ARCH_WANT_SYS_EXECVE #if !defined(__ASSEMBLY__) && !defined(ASSEMBLER) diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S index 1ccbe12a4d84..940a67263629 100644 --- a/arch/ia64/kernel/entry.S +++ b/arch/ia64/kernel/entry.S @@ -61,14 +61,13 @@ ENTRY(ia64_execve) * Allocate 8 input registers since ptrace() may clobber them */ .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) - alloc loc1=ar.pfs,8,2,4,0 + alloc loc1=ar.pfs,8,2,3,0 mov loc0=rp .body mov out0=in0 // filename ;; // stop bit between alloc and call mov out1=in1 // argv mov out2=in2 // envp - add out3=16,sp // regs br.call.sptk.many rp=sys_execve .ret0: cmp4.ge p6,p7=r8,r0 @@ -76,7 +75,6 @@ ENTRY(ia64_execve) sxt4 r8=r8 // return 64-bit result ;; stf.spill [sp]=f0 -(p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode... mov rp=loc0 (p6) mov ar.pfs=r0 // clear ar.pfs on success (p7) br.ret.sptk.many rp @@ -484,19 +482,6 @@ GLOBAL_ENTRY(prefetch_stack) br.ret.sptk.many rp END(prefetch_stack) -GLOBAL_ENTRY(kernel_execve) - rum psr.ac - mov r15=__NR_execve // put syscall number in place - break __BREAK_SYSCALL - br.ret.sptk.many rp -END(kernel_execve) - -GLOBAL_ENTRY(clone) - mov r15=__NR_clone // put syscall number in place - break __BREAK_SYSCALL - br.ret.sptk.many rp -END(clone) - /* * Invoke a system call, but do some tracing before and after the call. * We MUST preserve the current register frame throughout this routine @@ -600,6 +585,27 @@ GLOBAL_ENTRY(ia64_strace_leave_kernel) .ret4: br.cond.sptk ia64_leave_kernel END(ia64_strace_leave_kernel) +ENTRY(call_payload) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0) + /* call the kernel_thread payload; fn is in r4, arg - in r5 */ + alloc loc1=ar.pfs,0,3,1,0 + mov loc0=rp + mov loc2=gp + mov out0=r5 // arg + ld8 r14 = [r4], 8 // fn.address + ;; + mov b6 = r14 + ld8 gp = [r4] // fn.gp + ;; + br.call.sptk.many rp=b6 // fn(arg) +.ret12: mov gp=loc2 + mov rp=loc0 + mov ar.pfs=loc1 + /* ... and if it has returned, we are going to userland */ + cmp.ne pKStk,pUStk=r0,r0 + br.ret.sptk.many rp +END(call_payload) + GLOBAL_ENTRY(ia64_ret_from_clone) PT_REGS_UNWIND_INFO(0) { /* @@ -616,6 +622,7 @@ GLOBAL_ENTRY(ia64_ret_from_clone) br.call.sptk.many rp=ia64_invoke_schedule_tail } .ret8: +(pKStk) br.call.sptk.many rp=call_payload adds r2=TI_FLAGS+IA64_TASK_SIZE,r13 ;; ld4 r2=[r2] diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S index 629a250f7c19..4738ff7bd66a 100644 --- a/arch/ia64/kernel/head.S +++ b/arch/ia64/kernel/head.S @@ -1093,19 +1093,6 @@ GLOBAL_ENTRY(cycle_to_cputime) END(cycle_to_cputime) #endif /* CONFIG_VIRT_CPU_ACCOUNTING */ -GLOBAL_ENTRY(start_kernel_thread) - .prologue - .save rp, r0 // this is the end of the call-chain - .body - alloc r2 = ar.pfs, 0, 0, 2, 0 - mov out0 = r9 - mov out1 = r11;; - br.call.sptk.many rp = kernel_thread_helper;; - mov out0 = r8 - br.call.sptk.many rp = sys_exit;; -1: br.sptk.few 1b // not reached -END(start_kernel_thread) - #ifdef CONFIG_IA64_BRL_EMU /* diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index 35e106f2ed13..25543a295ad9 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -401,64 +401,15 @@ copy_thread(unsigned long clone_flags, struct pt_regs *child_ptregs; int retval = 0; -#ifdef CONFIG_SMP - /* - * For SMP idle threads, fork_by_hand() calls do_fork with - * NULL regs. - */ - if (!regs) - return 0; -#endif - - stack = ((struct switch_stack *) regs) - 1; - child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; child_stack = (struct switch_stack *) child_ptregs - 1; - /* copy parent's switch_stack & pt_regs to child: */ - memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); - rbs = (unsigned long) current + IA64_RBS_OFFSET; child_rbs = (unsigned long) p + IA64_RBS_OFFSET; - rbs_size = stack->ar_bspstore - rbs; - - /* copy the parent's register backing store to the child: */ - memcpy((void *) child_rbs, (void *) rbs, rbs_size); - - if (likely(user_mode(child_ptregs))) { - if (clone_flags & CLONE_SETTLS) - child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */ - if (user_stack_base) { - child_ptregs->r12 = user_stack_base + user_stack_size - 16; - child_ptregs->ar_bspstore = user_stack_base; - child_ptregs->ar_rnat = 0; - child_ptregs->loadrs = 0; - } - } else { - /* - * Note: we simply preserve the relative position of - * the stack pointer here. There is no need to - * allocate a scratch area here, since that will have - * been taken care of by the caller of sys_clone() - * already. - */ - child_ptregs->r12 = (unsigned long) child_ptregs - 16; /* kernel sp */ - child_ptregs->r13 = (unsigned long) p; /* set `current' pointer */ - } - child_stack->ar_bspstore = child_rbs + rbs_size; - child_stack->b0 = (unsigned long) &ia64_ret_from_clone; /* copy parts of thread_struct: */ p->thread.ksp = (unsigned long) child_stack - 16; - /* stop some PSR bits from being inherited. - * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() - * therefore we must specify them explicitly here and not include them in - * IA64_PSR_BITS_TO_CLEAR. - */ - child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) - & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); - /* * NOTE: The calling convention considers all floating point * registers in the high partition (fph) to be scratch. Since @@ -480,8 +431,66 @@ copy_thread(unsigned long clone_flags, # define THREAD_FLAGS_TO_SET 0 p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) | THREAD_FLAGS_TO_SET); + ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ + if (unlikely(p->flags & PF_KTHREAD)) { + if (unlikely(!user_stack_base)) { + /* fork_idle() called us */ + return 0; + } + memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack)); + child_stack->r4 = user_stack_base; /* payload */ + child_stack->r5 = user_stack_size; /* argument */ + /* + * Preserve PSR bits, except for bits 32-34 and 37-45, + * which we can't read. + */ + child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; + /* mark as valid, empty frame */ + child_ptregs->cr_ifs = 1UL << 63; + child_stack->ar_fpsr = child_ptregs->ar_fpsr + = ia64_getreg(_IA64_REG_AR_FPSR); + child_stack->pr = (1 << PRED_KERNEL_STACK); + child_stack->ar_bspstore = child_rbs; + child_stack->b0 = (unsigned long) &ia64_ret_from_clone; + + /* stop some PSR bits from being inherited. + * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() + * therefore we must specify them explicitly here and not include them in + * IA64_PSR_BITS_TO_CLEAR. + */ + child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) + & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); + + return 0; + } + stack = ((struct switch_stack *) regs) - 1; + /* copy parent's switch_stack & pt_regs to child: */ + memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); + + /* copy the parent's register backing store to the child: */ + rbs_size = stack->ar_bspstore - rbs; + memcpy((void *) child_rbs, (void *) rbs, rbs_size); + if (clone_flags & CLONE_SETTLS) + child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */ + if (user_stack_base) { + child_ptregs->r12 = user_stack_base + user_stack_size - 16; + child_ptregs->ar_bspstore = user_stack_base; + child_ptregs->ar_rnat = 0; + child_ptregs->loadrs = 0; + } + child_stack->ar_bspstore = child_rbs + rbs_size; + child_stack->b0 = (unsigned long) &ia64_ret_from_clone; + + /* stop some PSR bits from being inherited. + * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() + * therefore we must specify them explicitly here and not include them in + * IA64_PSR_BITS_TO_CLEAR. + */ + child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) + & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); + #ifdef CONFIG_PERFMON if (current->thread.pfm_context) pfm_inherit(p, child_ptregs); @@ -608,57 +617,6 @@ dump_fpu (struct pt_regs *pt, elf_fpregset_t dst) return 1; /* f0-f31 are always valid so we always return 1 */ } -long -sys_execve (const char __user *filename, - const char __user *const __user *argv, - const char __user *const __user *envp, - struct pt_regs *regs) -{ - struct filename *fname; - int error; - - fname = getname(filename); - error = PTR_ERR(fname); - if (IS_ERR(fname)) - goto out; - error = do_execve(fname->name, argv, envp, regs); - putname(fname); -out: - return error; -} - -pid_t -kernel_thread (int (*fn)(void *), void *arg, unsigned long flags) -{ - extern void start_kernel_thread (void); - unsigned long *helper_fptr = (unsigned long *) &start_kernel_thread; - struct { - struct switch_stack sw; - struct pt_regs pt; - } regs; - - memset(®s, 0, sizeof(regs)); - regs.pt.cr_iip = helper_fptr[0]; /* set entry point (IP) */ - regs.pt.r1 = helper_fptr[1]; /* set GP */ - regs.pt.r9 = (unsigned long) fn; /* 1st argument */ - regs.pt.r11 = (unsigned long) arg; /* 2nd argument */ - /* Preserve PSR bits, except for bits 32-34 and 37-45, which we can't read. */ - regs.pt.cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; - regs.pt.cr_ifs = 1UL << 63; /* mark as valid, empty frame */ - regs.sw.ar_fpsr = regs.pt.ar_fpsr = ia64_getreg(_IA64_REG_AR_FPSR); - regs.sw.ar_bspstore = (unsigned long) current + IA64_RBS_OFFSET; - regs.sw.pr = (1 << PRED_KERNEL_STACK); - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s.pt, 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - -/* This gets called from kernel_thread() via ia64_invoke_thread_helper(). */ -int -kernel_thread_helper (int (*fn)(void *), void *arg) -{ - return (*fn)(arg); -} - /* * Flush thread state. This is called when a thread does an execve(). */ diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index e7c161433eae..953a7ba5d050 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -16,6 +16,7 @@ config M68K select ARCH_WANT_IPC_PARSE_VERSION select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_REL select MODULES_USE_ELF_RELA diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h index 5fc7f7bec1c8..0aa165405966 100644 --- a/arch/m68k/include/asm/unistd.h +++ b/arch/m68k/include/asm/unistd.h @@ -32,7 +32,6 @@ #define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_SYS_EXECVE -#define __ARCH_WANT_KERNEL_EXECVE /* * "Conditional" syscalls diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 946cb0187751..45b2f293f8cf 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -115,16 +115,9 @@ ENTRY(ret_from_kernel_thread) | a3 contains the kernel thread payload, d7 - its argument movel %d1,%sp@- jsr schedule_tail - GET_CURRENT(%d0) movel %d7,(%sp) jsr %a3@ addql #4,%sp - movel %d0,(%sp) - jra sys_exit - -ENTRY(ret_from_kernel_execve) - movel 4(%sp), %sp - GET_CURRENT(%d0) jra ret_from_exception #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index dba9390d37cf..4183e62f178c 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -40,6 +40,8 @@ config MIPS select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_REL select MODULES_USE_ELF_RELA if 64BIT + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE menu "Machine selection" diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h index 5e33fabe354d..d28c41e0887c 100644 --- a/arch/mips/include/asm/processor.h +++ b/arch/mips/include/asm/processor.h @@ -310,8 +310,6 @@ struct task_struct; /* Free all resources held by a thread. */ #define release_thread(thread) do { } while(0) -extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); - extern unsigned long thread_saved_pc(struct task_struct *tsk); /* diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h index 4f5da948a777..cec5e125f7e4 100644 --- a/arch/mips/include/asm/ptrace.h +++ b/arch/mips/include/asm/ptrace.h @@ -61,4 +61,10 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs) die(str, regs); } +#define current_pt_regs() \ +({ \ + unsigned long sp = (unsigned long)__builtin_frame_address(0); \ + (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \ +}) + #endif /* _ASM_PTRACE_H */ diff --git a/arch/mips/include/asm/unistd.h b/arch/mips/include/asm/unistd.h index 9e47cc11aa26..b306e2081cad 100644 --- a/arch/mips/include/asm/unistd.h +++ b/arch/mips/include/asm/unistd.h @@ -20,6 +20,7 @@ #define __ARCH_OMIT_COMPAT_SYS_GETDENTS64 #define __ARCH_WANT_OLD_READDIR #define __ARCH_WANT_SYS_ALARM +#define __ARCH_WANT_SYS_EXECVE #define __ARCH_WANT_SYS_GETHOSTNAME #define __ARCH_WANT_SYS_IPC #define __ARCH_WANT_SYS_PAUSE diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S index a6c133212003..3320cb4ac1d4 100644 --- a/arch/mips/kernel/entry.S +++ b/arch/mips/kernel/entry.S @@ -65,6 +65,12 @@ need_resched: b need_resched #endif +FEXPORT(ret_from_kernel_thread) + jal schedule_tail # a0 = struct task_struct *prev + move a0, s1 + jal s0 + j syscall_exit + FEXPORT(ret_from_fork) jal schedule_tail # a0 = struct task_struct *prev diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c index 3a21acedf882..8796dbc7e358 100644 --- a/arch/mips/kernel/linux32.c +++ b/arch/mips/kernel/linux32.c @@ -3,7 +3,6 @@ * * Copyright (C) 2000 Silicon Graphics, Inc. * Written by Ulf Carlsson (ulfc@engr.sgi.com) - * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com) */ #include <linux/compiler.h> #include <linux/mm.h> @@ -77,26 +76,6 @@ out: return error; } -/* - * sys_execve() executes a new program. - */ -asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs) -{ - int error; - struct filename *filename; - - filename = getname(compat_ptr(regs.regs[4])); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]), - compat_ptr(regs.regs[6]), ®s); - putname(filename); - -out: - return error; -} - #define RLIM_INFINITY32 0x7fffffff #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x) diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c index 3fc1691110dc..2d9304c2b54c 100644 --- a/arch/mips/kernel/mips_ksyms.c +++ b/arch/mips/kernel/mips_ksyms.c @@ -32,8 +32,6 @@ EXPORT_SYMBOL(memset); EXPORT_SYMBOL(memcpy); EXPORT_SYMBOL(memmove); -EXPORT_SYMBOL(kernel_thread); - /* * Functions that operate on entire pages. Mostly used by memory management. */ diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index e9a5fd7277f4..d13720ac656f 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -84,6 +84,7 @@ void __noreturn cpu_idle(void) } asmlinkage void ret_from_fork(void); +asmlinkage void ret_from_kernel_thread(void); void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) { @@ -113,7 +114,7 @@ void flush_thread(void) } int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, struct task_struct *p, struct pt_regs *regs) + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct thread_info *ti = task_thread_info(p); struct pt_regs *childregs; @@ -136,19 +137,30 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, childregs = (struct pt_regs *) childksp - 1; /* Put the stack after the struct pt_regs. */ childksp = (unsigned long) childregs; + p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1); + if (unlikely(p->flags & PF_KTHREAD)) { + unsigned long status = p->thread.cp0_status; + memset(childregs, 0, sizeof(struct pt_regs)); + ti->addr_limit = KERNEL_DS; + p->thread.reg16 = usp; /* fn */ + p->thread.reg17 = arg; + p->thread.reg29 = childksp; + p->thread.reg31 = (unsigned long) ret_from_kernel_thread; +#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) + status = (status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) | + ((status & (ST0_KUC | ST0_IEC)) << 2); +#else + status |= ST0_EXL; +#endif + childregs->cp0_status = status; + return 0; + } *childregs = *regs; childregs->regs[7] = 0; /* Clear error flag */ - childregs->regs[2] = 0; /* Child gets zero as return value */ + childregs->regs[29] = usp; + ti->addr_limit = USER_DS; - if (childregs->cp0_status & ST0_CU0) { - childregs->regs[28] = (unsigned long) ti; - childregs->regs[29] = childksp; - ti->addr_limit = KERNEL_DS; - } else { - childregs->regs[29] = usp; - ti->addr_limit = USER_DS; - } p->thread.reg29 = (unsigned long) childregs; p->thread.reg31 = (unsigned long) ret_from_fork; @@ -156,7 +168,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, * New tasks lose permission to use the fpu. This accelerates context * switching for most programs since they don't use the fpu. */ - p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1); childregs->cp0_status &= ~(ST0_CU2|ST0_CU1); #ifdef CONFIG_MIPS_MT_SMTC @@ -222,35 +233,6 @@ int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr) } /* - * Create a kernel thread - */ -static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *)) -{ - do_exit(fn(arg)); -} - -long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - - regs.regs[4] = (unsigned long) arg; - regs.regs[5] = (unsigned long) fn; - regs.cp0_epc = (unsigned long) kernel_thread_helper; - regs.cp0_status = read_c0_status(); -#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) - regs.cp0_status = (regs.cp0_status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) | - ((regs.cp0_status & (ST0_KUC | ST0_IEC)) << 2); -#else - regs.cp0_status |= ST0_EXL; -#endif - - /* Ok, create the new process.. */ - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); -} - -/* * */ struct mips_frame_info { diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S index f6ba8381ee01..d27ca340d46d 100644 --- a/arch/mips/kernel/scall64-n32.S +++ b/arch/mips/kernel/scall64-n32.S @@ -167,7 +167,7 @@ EXPORT(sysn32_call_table) PTR sys_getsockopt PTR sys_clone /* 6055 */ PTR sys_fork - PTR sys32_execve + PTR compat_sys_execve PTR sys_exit PTR compat_sys_wait4 PTR sys_kill /* 6060 */ diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S index 53c2d7245764..9601be6afa3d 100644 --- a/arch/mips/kernel/scall64-o32.S +++ b/arch/mips/kernel/scall64-o32.S @@ -203,7 +203,7 @@ sys_call_table: PTR sys_creat PTR sys_link PTR sys_unlink /* 4010 */ - PTR sys32_execve + PTR compat_sys_execve PTR sys_chdir PTR compat_sys_time PTR sys_mknod diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 2bd561bc05ae..c611e2df7767 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -127,28 +127,6 @@ _sys_clone(nabi_no_regargs struct pt_regs regs) parent_tidptr, child_tidptr); } -/* - * sys_execve() executes a new program. - */ -asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) -{ - int error; - struct filename *filename; - - filename = getname((const char __user *) (long)regs.regs[4]); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, - (const char __user *const __user *) (long)regs.regs[5], - (const char __user *const __user *) (long)regs.regs[6], - ®s); - putname(filename); - -out: - return error; -} - SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) { struct thread_info *ti = task_thread_info(current); @@ -313,34 +291,3 @@ asmlinkage void bad_stack(void) { do_exit(SIGSEGV); } - -/* - * Do a system call from kernel instead of calling sys_execve so we - * end up with proper pt_regs. - */ -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - register unsigned long __a0 asm("$4") = (unsigned long) filename; - register unsigned long __a1 asm("$5") = (unsigned long) argv; - register unsigned long __a2 asm("$6") = (unsigned long) envp; - register unsigned long __a3 asm("$7"); - unsigned long __v0; - - __asm__ volatile (" \n" - " .set noreorder \n" - " li $2, %5 # __NR_execve \n" - " syscall \n" - " move %0, $2 \n" - " .set reorder \n" - : "=&r" (__v0), "=r" (__a3) - : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) - : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", - "memory"); - - if (__a3 == 0) - return __v0; - - return -__v0; -} diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index 05f2ba41ff1a..e7f1a2993f78 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -22,6 +22,8 @@ config OPENRISC select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE config MMU def_bool y diff --git a/arch/openrisc/include/uapi/asm/unistd.h b/arch/openrisc/include/uapi/asm/unistd.h index 437bdbb61b14..5db7bc0fa5a7 100644 --- a/arch/openrisc/include/uapi/asm/unistd.h +++ b/arch/openrisc/include/uapi/asm/unistd.h @@ -20,6 +20,8 @@ #define sys_mmap2 sys_mmap_pgoff +#define __ARCH_WANT_SYS_EXECVE + #include <asm-generic/unistd.h> #define __NR_or1k_atomic __NR_arch_specific_syscall diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index ddfcaa828b0e..c60a09df323f 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -894,6 +894,16 @@ ENTRY(ret_from_fork) l.jal schedule_tail l.nop + /* Check if we are a kernel thread */ + l.sfeqi r20,0 + l.bf 1f + l.nop + + /* ...we are a kernel thread so invoke the requested callback */ + l.jalr r20 + l.or r3,r22,r0 + +1: /* _syscall_returns expect r11 to contain return value */ l.lwz r11,PT_GPR11(r1) @@ -915,26 +925,6 @@ ENTRY(ret_from_fork) l.j _syscall_return l.nop -/* Since syscalls don't save call-clobbered registers, the args to - * kernel_thread_helper will need to be passed through callee-saved - * registers and copied to the parameter registers when the thread - * begins running. - * - * See arch/openrisc/kernel/process.c: - * The args are passed as follows: - * arg1 (r3) : passed in r20 - * arg2 (r4) : passed in r22 - */ - -ENTRY(_kernel_thread_helper) - l.or r3,r20,r0 - l.or r4,r22,r0 - l.movhi r31,hi(kernel_thread_helper) - l.ori r31,r31,lo(kernel_thread_helper) - l.jr r31 - l.nop - - /* ========================================================[ switch ] === */ /* @@ -1044,8 +1034,13 @@ ENTRY(_switch) /* Unwind stack to pre-switch state */ l.addi r1,r1,(INT_FRAME_SIZE) - /* Return via the link-register back to where we 'came from', where that can be - * either schedule() or return_from_fork()... */ + /* Return via the link-register back to where we 'came from', where + * that may be either schedule(), ret_from_fork(), or + * ret_from_kernel_thread(). If we are returning to a new thread, + * we are expected to have set up the arg to schedule_tail already, + * hence we do so here unconditionally: + */ + l.lwz r3,TI_STACK(r3) /* Load 'prev' as schedule_tail arg */ l.jr r9 l.nop @@ -1088,10 +1083,6 @@ ENTRY(sys_fork) l.j _fork_save_extra_regs_and_call l.addi r3,r1,0 -ENTRY(sys_execve) - l.j _sys_execve - l.addi r6,r1,0 - ENTRY(sys_sigaltstack) l.j _sys_sigaltstack l.addi r5,r1,0 diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c index c35f3ab1a8d3..e0874b8e09e4 100644 --- a/arch/openrisc/kernel/process.c +++ b/arch/openrisc/kernel/process.c @@ -109,66 +109,82 @@ void release_thread(struct task_struct *dead_task) */ extern asmlinkage void ret_from_fork(void); +/* + * copy_thread + * @clone_flags: flags + * @usp: user stack pointer or fn for kernel thread + * @arg: arg to fn for kernel thread; always NULL for userspace thread + * @p: the newly created task + * @regs: CPU context to copy for userspace thread; always NULL for kthread + * + * At the top of a newly initialized kernel stack are two stacked pt_reg + * structures. The first (topmost) is the userspace context of the thread. + * The second is the kernelspace context of the thread. + * + * A kernel thread will not be returning to userspace, so the topmost pt_regs + * struct can be uninitialized; it _does_ need to exist, though, because + * a kernel thread can become a userspace thread by doing a kernel_execve, in + * which case the topmost context will be initialized and used for 'returning' + * to userspace. + * + * The second pt_reg struct needs to be initialized to 'return' to + * ret_from_fork. A kernel thread will need to set r20 to the address of + * a function to call into (with arg in r22); userspace threads need to set + * r20 to NULL in which case ret_from_fork will just continue a return to + * userspace. + * + * A kernel thread 'fn' may return; this is effectively what happens when + * kernel_execve is called. In that case, the userspace pt_regs must have + * been initialized (which kernel_execve takes care of, see start_thread + * below); ret_from_fork will then continue its execution causing the + * 'kernel thread' to return to userspace as a userspace thread. + */ + int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, struct task_struct *p, struct pt_regs *regs) + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { - struct pt_regs *childregs; + struct pt_regs *userregs; struct pt_regs *kregs; unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; - struct thread_info *ti; unsigned long top_of_kernel_stack; top_of_kernel_stack = sp; p->set_child_tid = p->clear_child_tid = NULL; - /* Copy registers */ - /* redzone */ - sp -= STACK_FRAME_OVERHEAD; + /* Locate userspace context on stack... */ + sp -= STACK_FRAME_OVERHEAD; /* redzone */ sp -= sizeof(struct pt_regs); - childregs = (struct pt_regs *)sp; + userregs = (struct pt_regs *) sp; - /* Copy parent registers */ - *childregs = *regs; + /* ...and kernel context */ + sp -= STACK_FRAME_OVERHEAD; /* redzone */ + sp -= sizeof(struct pt_regs); + kregs = (struct pt_regs *)sp; - if ((childregs->sr & SPR_SR_SM) == 1) { - /* for kernel thread, set `current_thread_info' - * and stackptr in new task - */ - childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; - childregs->gpr[10] = (unsigned long)task_thread_info(p); + if (unlikely(p->flags & PF_KTHREAD)) { + memset(kregs, 0, sizeof(struct pt_regs)); + kregs->gpr[20] = usp; /* fn, kernel thread */ + kregs->gpr[22] = arg; } else { - childregs->sp = usp; - } - - childregs->gpr[11] = 0; /* Result from fork() */ + *userregs = *regs; - /* - * The way this works is that at some point in the future - * some task will call _switch to switch to the new task. - * That will pop off the stack frame created below and start - * the new task running at ret_from_fork. The new task will - * do some house keeping and then return from the fork or clone - * system call, using the stack frame created above. - */ - /* redzone */ - sp -= STACK_FRAME_OVERHEAD; - sp -= sizeof(struct pt_regs); - kregs = (struct pt_regs *)sp; + userregs->sp = usp; + userregs->gpr[11] = 0; /* Result from fork() */ - ti = task_thread_info(p); - ti->ksp = sp; + kregs->gpr[20] = 0; /* Userspace thread */ + } - /* kregs->sp must store the location of the 'pre-switch' kernel stack - * pointer... for a newly forked process, this is simply the top of - * the kernel stack. + /* + * _switch wants the kernel stack page in pt_regs->sp so that it + * can restore it to thread_info->ksp... see _switch for details. */ kregs->sp = top_of_kernel_stack; - kregs->gpr[3] = (unsigned long)current; /* arg to schedule_tail */ - kregs->gpr[10] = (unsigned long)task_thread_info(p); kregs->gpr[9] = (unsigned long)ret_from_fork; + task_thread_info(p)->ksp = (unsigned long)kregs; + return 0; } @@ -177,16 +193,14 @@ copy_thread(unsigned long clone_flags, unsigned long usp, */ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) { - unsigned long sr = regs->sr & ~SPR_SR_SM; + unsigned long sr = mfspr(SPR_SR) & ~SPR_SR_SM; set_fs(USER_DS); - memset(regs->gpr, 0, sizeof(regs->gpr)); + memset(regs, 0, sizeof(struct pt_regs)); regs->pc = pc; regs->sr = sr; regs->sp = sp; - -/* printk("start thread, ksp = %lx\n", current_thread_info()->ksp);*/ } /* Fill in the fpu structure for a core dump. */ @@ -237,74 +251,9 @@ void dump_elf_thread(elf_greg_t *dest, struct pt_regs* regs) dest[35] = 0; } -extern void _kernel_thread_helper(void); - -void __noreturn kernel_thread_helper(int (*fn) (void *), void *arg) -{ - do_exit(fn(arg)); -} - -/* - * Create a kernel thread. - */ -int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - - regs.gpr[20] = (unsigned long)fn; - regs.gpr[22] = (unsigned long)arg; - regs.sr = mfspr(SPR_SR); - regs.pc = (unsigned long)_kernel_thread_helper; - - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, - 0, ®s, 0, NULL, NULL); -} - -/* - * sys_execve() executes a new program. - */ -asmlinkage long _sys_execve(const char __user *name, - const char __user * const __user *argv, - const char __user * const __user *envp, - struct pt_regs *regs) -{ - int error; - struct filename *filename; - - filename = getname(name); - error = PTR_ERR(filename); - - if (IS_ERR(filename)) - goto out; - - error = do_execve(filename->name, argv, envp, regs); - putname(filename); - -out: - return error; -} - unsigned long get_wchan(struct task_struct *p) { /* TODO */ return 0; } - -int kernel_execve(const char *filename, char *const argv[], char *const envp[]) -{ - register long __res asm("r11") = __NR_execve; - register long __a asm("r3") = (long)(filename); - register long __b asm("r4") = (long)(argv); - register long __c asm("r5") = (long)(envp); - __asm__ volatile ("l.sys 1" - : "=r" (__res), "=r"(__a), "=r"(__b), "=r"(__c) - : "0"(__res), "1"(__a), "2"(__b), "3"(__c) - : "r6", "r7", "r8", "r12", "r13", "r15", - "r17", "r19", "r21", "r23", "r25", "r27", - "r29", "r31"); - __asm__ volatile ("l.nop"); - return __res; -} diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index 11def45b98c5..0aec70c35614 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -22,6 +22,8 @@ config PARISC select GENERIC_STRNCPY_FROM_USER select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE help The PA-RISC microprocessor is designed by Hewlett-Packard and used diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h index 541639c3f607..55512e26b0c2 100644 --- a/arch/parisc/include/asm/unistd.h +++ b/arch/parisc/include/asm/unistd.h @@ -163,6 +163,7 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \ #define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND +#define __ARCH_WANT_SYS_EXECVE #endif /* __ASSEMBLY__ */ diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S index 18670a078849..c9a9abd4bc58 100644 --- a/arch/parisc/kernel/entry.S +++ b/arch/parisc/kernel/entry.S @@ -708,59 +708,9 @@ ENTRY(end_fault_vector) .import do_cpu_irq_mask,code /* - * r26 = function to be called - * r25 = argument to pass in - * r24 = flags for do_fork() - * - * Kernel threads don't ever return, so they don't need - * a true register context. We just save away the arguments - * for copy_thread/ret_ to properly set up the child. - */ - -#define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */ -#define CLONE_UNTRACED 0x00800000 - - .import do_fork -ENTRY(__kernel_thread) - STREG %r2, -RP_OFFSET(%r30) - - copy %r30, %r1 - ldo PT_SZ_ALGN(%r30),%r30 -#ifdef CONFIG_64BIT - /* Yo, function pointers in wide mode are little structs... -PB */ - ldd 24(%r26), %r2 - STREG %r2, PT_GR27(%r1) /* Store childs %dp */ - ldd 16(%r26), %r26 - - STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */ - copy %r0, %r22 /* user_tid */ -#endif - STREG %r26, PT_GR26(%r1) /* Store function & argument for child */ - STREG %r25, PT_GR25(%r1) - ldil L%CLONE_UNTRACED, %r26 - ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */ - or %r26, %r24, %r26 /* will have kernel mappings. */ - ldi 1, %r25 /* stack_start, signals kernel thread */ - stw %r0, -52(%r30) /* user_tid */ -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - BL do_fork, %r2 - copy %r1, %r24 /* pt_regs */ - - /* Parent Returns here */ - - LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2 - ldo -PT_SZ_ALGN(%r30), %r30 - bv %r0(%r2) - nop -ENDPROC(__kernel_thread) - - /* * Child Returns here * - * copy_thread moved args from temp save area set up above - * into task save area. + * copy_thread moved args into task save area. */ ENTRY(ret_from_kernel_thread) @@ -769,51 +719,17 @@ ENTRY(ret_from_kernel_thread) BL schedule_tail, %r2 nop - LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1 + LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 LDREG TASK_PT_GR25(%r1), %r26 #ifdef CONFIG_64BIT LDREG TASK_PT_GR27(%r1), %r27 - LDREG TASK_PT_GR22(%r1), %r22 #endif LDREG TASK_PT_GR26(%r1), %r1 ble 0(%sr7, %r1) copy %r31, %r2 - -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ - loadgp /* Thread could have been in a module */ -#endif -#ifndef CONFIG_64BIT - b sys_exit -#else - load32 sys_exit, %r1 - bv %r0(%r1) -#endif - ldi 0, %r26 -ENDPROC(ret_from_kernel_thread) - - .import sys_execve, code -ENTRY(__execve) - copy %r2, %r15 - copy %r30, %r16 - ldo PT_SZ_ALGN(%r30), %r30 - STREG %r26, PT_GR26(%r16) - STREG %r25, PT_GR25(%r16) - STREG %r24, PT_GR24(%r16) -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - BL sys_execve, %r2 - copy %r16, %r26 - - cmpib,=,n 0,%r28,intr_return /* forward */ - - /* yes, this will trap and die. */ - copy %r15, %r2 - copy %r16, %r30 - bv %r0(%r2) + b finish_child_return nop -ENDPROC(__execve) +ENDPROC(ret_from_kernel_thread) /* @@ -1776,49 +1692,27 @@ ENTRY(sys_fork_wrapper) LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 ldo TASK_REGS(%r1),%r1 reg_save %r1 - mfctl %cr27, %r3 - STREG %r3, PT_CR27(%r1) - - STREG %r2,-RP_OFFSET(%r30) - ldo FRAME_SIZE(%r30),%r30 -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - - /* These are call-clobbered registers and therefore - also syscall-clobbered (we hope). */ - STREG %r2,PT_GR19(%r1) /* save for child */ - STREG %r30,PT_GR21(%r1) + mfctl %cr27, %r28 + STREG %r28, PT_CR27(%r1) LDREG PT_GR30(%r1),%r25 copy %r1,%r24 - BL sys_clone,%r2 + b sys_clone ldi SIGCHLD,%r26 - - LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 -wrapper_exit: - ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */ - LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 - ldo TASK_REGS(%r1),%r1 /* get pt regs */ - - LDREG PT_CR27(%r1), %r3 - mtctl %r3, %cr27 - reg_restore %r1 - - /* strace expects syscall # to be preserved in r20 */ - ldi __NR_fork,%r20 - bv %r0(%r2) - STREG %r20,PT_GR20(%r1) ENDPROC(sys_fork_wrapper) /* Set the return value for the child */ ENTRY(child_return) BL schedule_tail, %r2 nop +finish_child_return: + LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 + ldo TASK_REGS(%r1),%r1 /* get pt regs */ - LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1 - LDREG TASK_PT_GR19(%r1),%r2 - b wrapper_exit + LDREG PT_CR27(%r1), %r3 + mtctl %r3, %cr27 + reg_restore %r1 + b syscall_exit copy %r0,%r28 ENDPROC(child_return) @@ -1827,23 +1721,10 @@ ENTRY(sys_clone_wrapper) LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ reg_save %r1 - mfctl %cr27, %r3 - STREG %r3, PT_CR27(%r1) - - STREG %r2,-RP_OFFSET(%r30) - ldo FRAME_SIZE(%r30),%r30 -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - - /* WARNING - Clobbers r19 and r21, userspace must save these! */ - STREG %r2,PT_GR19(%r1) /* save for child */ - STREG %r30,PT_GR21(%r1) - BL sys_clone,%r2 + mfctl %cr27, %r28 + STREG %r28, PT_CR27(%r1) + b sys_clone copy %r1,%r24 - - b wrapper_exit - LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 ENDPROC(sys_clone_wrapper) @@ -1851,72 +1732,14 @@ ENTRY(sys_vfork_wrapper) LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ reg_save %r1 - mfctl %cr27, %r3 - STREG %r3, PT_CR27(%r1) + mfctl %cr27, %r28 + STREG %r28, PT_CR27(%r1) - STREG %r2,-RP_OFFSET(%r30) - ldo FRAME_SIZE(%r30),%r30 -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - - STREG %r2,PT_GR19(%r1) /* save for child */ - STREG %r30,PT_GR21(%r1) - - BL sys_vfork,%r2 + b sys_vfork copy %r1,%r26 - - b wrapper_exit - LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 ENDPROC(sys_vfork_wrapper) - .macro execve_wrapper execve - LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 - ldo TASK_REGS(%r1),%r1 /* get pt regs */ - - /* - * Do we need to save/restore r3-r18 here? - * I don't think so. why would new thread need old - * threads registers? - */ - - /* %arg0 - %arg3 are already saved for us. */ - - STREG %r2,-RP_OFFSET(%r30) - ldo FRAME_SIZE(%r30),%r30 -#ifdef CONFIG_64BIT - ldo -16(%r30),%r29 /* Reference param save area */ -#endif - BL \execve,%r2 - copy %r1,%arg0 - - ldo -FRAME_SIZE(%r30),%r30 - LDREG -RP_OFFSET(%r30),%r2 - - /* If exec succeeded we need to load the args */ - - ldo -1024(%r0),%r1 - cmpb,>>= %r28,%r1,error_\execve - copy %r2,%r19 - -error_\execve: - bv %r0(%r19) - nop - .endm - - .import sys_execve -ENTRY(sys_execve_wrapper) - execve_wrapper sys_execve -ENDPROC(sys_execve_wrapper) - -#ifdef CONFIG_64BIT - .import sys32_execve -ENTRY(sys32_execve_wrapper) - execve_wrapper sys32_execve -ENDPROC(sys32_execve_wrapper) -#endif - ENTRY(sys_rt_sigreturn_wrapper) LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 ldo TASK_REGS(%r26),%r26 /* get pt regs */ diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index cbc37216bf90..38db36f64307 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -52,6 +52,7 @@ #include <asm/io.h> #include <asm/asm-offsets.h> +#include <asm/assembly.h> #include <asm/pdc.h> #include <asm/pdc_chassis.h> #include <asm/pgalloc.h> @@ -165,23 +166,6 @@ void (*pm_power_off)(void) = machine_power_off; EXPORT_SYMBOL(pm_power_off); /* - * Create a kernel thread - */ - -extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); -pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - - /* - * FIXME: Once we are sure we don't need any debug here, - * kernel_thread can become a #define. - */ - - return __kernel_thread(fn, arg, flags); -} -EXPORT_SYMBOL(kernel_thread); - -/* * Free current thread data structures etc.. */ void exit_thread(void) @@ -256,8 +240,8 @@ sys_vfork(struct pt_regs *regs) int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, /* in ia64 this is "user_stack_size" */ - struct task_struct * p, struct pt_regs * pregs) + unsigned long arg, + struct task_struct *p, struct pt_regs *pregs) { struct pt_regs * cregs = &(p->thread.regs); void *stack = task_stack_page(p); @@ -270,48 +254,32 @@ copy_thread(unsigned long clone_flags, unsigned long usp, #ifdef CONFIG_HPUX extern void * const hpux_child_return; #endif + if (unlikely(p->flags & PF_KTHREAD)) { + memset(cregs, 0, sizeof(struct pt_regs)); + if (!usp) /* idle thread */ + return 0; - *cregs = *pregs; - - /* Set the return value for the child. Note that this is not - actually restored by the syscall exit path, but we put it - here for consistency in case of signals. */ - cregs->gr[28] = 0; /* child */ - - /* - * We need to differentiate between a user fork and a - * kernel fork. We can't use user_mode, because the - * the syscall path doesn't save iaoq. Right now - * We rely on the fact that kernel_thread passes - * in zero for usp. - */ - if (usp == 1) { /* kernel thread */ - cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN; /* Must exit via ret_from_kernel_thread in order * to call schedule_tail() */ + cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; cregs->kpc = (unsigned long) &ret_from_kernel_thread; /* * Copy function and argument to be called from * ret_from_kernel_thread. */ #ifdef CONFIG_64BIT - cregs->gr[27] = pregs->gr[27]; + cregs->gr[27] = ((unsigned long *)usp)[3]; + cregs->gr[26] = ((unsigned long *)usp)[2]; +#else + cregs->gr[26] = usp; #endif - cregs->gr[26] = pregs->gr[26]; - cregs->gr[25] = pregs->gr[25]; + cregs->gr[25] = arg; } else { /* user thread */ - /* - * Note that the fork wrappers are responsible - * for setting gr[21]. - */ - - /* Use same stack depth as parent */ - cregs->ksp = (unsigned long)stack - + (pregs->gr[21] & (THREAD_SIZE - 1)); cregs->gr[30] = usp; + cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; if (personality(p->personality) == PER_HPUX) { #ifdef CONFIG_HPUX cregs->kpc = (unsigned long) &hpux_child_return; @@ -323,8 +291,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp, } /* Setup thread TLS area from the 4th parameter in clone */ if (clone_flags & CLONE_SETTLS) - cregs->cr27 = pregs->gr[23]; - + cregs->cr27 = pregs->gr[23]; } return 0; @@ -335,39 +302,6 @@ unsigned long thread_saved_pc(struct task_struct *t) return t->thread.regs.kpc; } -/* - * sys_execve() executes a new program. - */ - -asmlinkage int sys_execve(struct pt_regs *regs) -{ - int error; - struct filename *filename; - - filename = getname((const char __user *) regs->gr[26]); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, - (const char __user *const __user *) regs->gr[25], - (const char __user *const __user *) regs->gr[24], - regs); - putname(filename); -out: - - return error; -} - -extern int __execve(const char *filename, - const char *const argv[], - const char *const envp[], struct task_struct *task); -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - return __execve(filename, argv, envp, current); -} - unsigned long get_wchan(struct task_struct *p) { diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c index bf5b93a885d3..9cfdaa19ab63 100644 --- a/arch/parisc/kernel/sys_parisc32.c +++ b/arch/parisc/kernel/sys_parisc32.c @@ -53,28 +53,6 @@ #define DBG(x) #endif -/* - * sys32_execve() executes a new program. - */ - -asmlinkage int sys32_execve(struct pt_regs *regs) -{ - int error; - struct filename *filename; - - DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26])); - filename = getname((const char __user *) regs->gr[26]); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = compat_do_execve(filename->name, compat_ptr(regs->gr[25]), - compat_ptr(regs->gr[24]), regs); - putname(filename); -out: - - return error; -} - asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23, int r22, int r21, int r20) { diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S index 3735abd7f8f6..cb2da96d6ab9 100644 --- a/arch/parisc/kernel/syscall_table.S +++ b/arch/parisc/kernel/syscall_table.S @@ -66,7 +66,7 @@ ENTRY_SAME(creat) ENTRY_SAME(link) ENTRY_SAME(unlink) /* 10 */ - ENTRY_DIFF(execve_wrapper) + ENTRY_COMP(execve) ENTRY_SAME(chdir) /* See comments in kernel/time.c!!! Maybe we don't need this? */ ENTRY_COMP(time) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 5dba755a43e6..af431de6363c 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -137,6 +137,7 @@ config S390 select KTIME_SCALAR if 32BIT select HAVE_ARCH_SECCOMP_FILTER select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h index bbbae41fa9a5..ccbcab7742cd 100644 --- a/arch/s390/include/asm/unistd.h +++ b/arch/s390/include/asm/unistd.h @@ -54,7 +54,6 @@ # define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND # endif #define __ARCH_WANT_SYS_EXECVE -#define __ARCH_WANT_KERNEL_EXECVE /* * "Conditional" syscalls diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index ef46f66bc0d6..aa8f2ba6289b 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -330,40 +330,18 @@ ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) l %r12,__LC_THREAD_INFO l %r13,__LC_SVC_NEW_PSW+4 - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - je 1f l %r1,BASED(.Lschedule_tail) basr %r14,%r1 # call schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_tracenogo - -1: # it's a kernel thread - st %r15,__PT_R15(%r11) # store stack pointer for new kthread - l %r1,BASED(.Lschedule_tail) - basr %r14,%r1 # call schedule_tail - TRACE_IRQS_ON - ssm __LC_SVC_NEW_PSW # reenable interrupts - lm %r9,%r11,__PT_R9(%r11) # load gprs + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lm %r9,%r10,__PT_R9(%r11) # load gprs ENTRY(kernel_thread_starter) la %r2,0(%r10) basr %r14,%r9 - la %r2,0 - br %r11 # do_exit - -# -# kernel_execve function needs to deal with pt_regs that is not -# at the usual place -# -ENTRY(ret_from_kernel_execve) - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - lr %r15,%r2 - lr %r11,%r2 - ahi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r12,__LC_THREAD_INFO - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_return + j sysc_tracenogo /* * Program check handler routine diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 07d8de353984..499e95e90f38 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -352,33 +352,17 @@ sysc_tracenogo: ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) lg %r12,__LC_THREAD_INFO - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - je 1f brasl %r14,schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_tracenogo -1: # it's a kernel thread - stg %r15,__PT_R15(%r11) # store stack pointer for new kthread - brasl %r14,schedule_tail - TRACE_IRQS_ON - ssm __LC_SVC_NEW_PSW # reenable interrupts - lmg %r9,%r11,__PT_R9(%r11) # load gprs + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lmg %r9,%r10,__PT_R9(%r11) # load gprs ENTRY(kernel_thread_starter) la %r2,0(%r10) basr %r14,%r9 - la %r2,0 - br %r11 # do_exit - -ENTRY(ret_from_kernel_execve) - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - lgr %r15,%r2 - lgr %r11,%r2 - aghi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - lg %r12,__LC_THREAD_INFO - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_return + j sysc_tracenogo /* * Program check handler routine diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 9f2edb5c5551..0c7d365fa402 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -41,6 +41,8 @@ config SPARC select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE config SPARC32 def_bool !64BIT diff --git a/arch/sparc/include/asm/processor_32.h b/arch/sparc/include/asm/processor_32.h index f74ac9ee33a8..c1e01914fd98 100644 --- a/arch/sparc/include/asm/processor_32.h +++ b/arch/sparc/include/asm/processor_32.h @@ -106,7 +106,6 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc, /* Free all resources held by a thread. */ #define release_thread(tsk) do { } while(0) -extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long get_wchan(struct task_struct *); diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h index 721e25f0e2ea..cce72ce4c334 100644 --- a/arch/sparc/include/asm/processor_64.h +++ b/arch/sparc/include/asm/processor_64.h @@ -94,6 +94,7 @@ struct thread_struct { #ifndef __ASSEMBLY__ #include <linux/types.h> +#include <asm/fpumacro.h> /* Return saved PC of a blocked thread. */ struct task_struct; @@ -143,6 +144,10 @@ do { \ : \ : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \ "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ + fprs_write(0); \ + current_thread_info()->xfsr[0] = 0; \ + current_thread_info()->fpsaved[0] = 0; \ + regs->tstate &= ~TSTATE_PEF; \ } while (0) #define start_thread32(regs, pc, sp) \ @@ -183,13 +188,15 @@ do { \ : \ : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \ "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ + fprs_write(0); \ + current_thread_info()->xfsr[0] = 0; \ + current_thread_info()->fpsaved[0] = 0; \ + regs->tstate &= ~TSTATE_PEF; \ } while (0) /* Free all resources held by a thread. */ #define release_thread(tsk) do { } while (0) -extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); - extern unsigned long get_wchan(struct task_struct *task); #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) diff --git a/arch/sparc/include/asm/ptrace.h b/arch/sparc/include/asm/ptrace.h index da43bdc62294..bdfafd7af46f 100644 --- a/arch/sparc/include/asm/ptrace.h +++ b/arch/sparc/include/asm/ptrace.h @@ -32,6 +32,9 @@ static inline bool pt_regs_clear_syscall(struct pt_regs *regs) #define arch_ptrace_stop(exit_code, info) \ synchronize_user_stack() +#define current_pt_regs() \ + ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1) + struct global_reg_snapshot { unsigned long tstate; unsigned long tpc; @@ -55,9 +58,7 @@ union global_cpu_snapshot { extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; -#define force_successful_syscall_return() \ -do { current_thread_info()->syscall_noerror = 1; \ -} while (0) +#define force_successful_syscall_return() set_thread_noerror(1) #define user_mode(regs) (!((regs)->tstate & TSTATE_PRIV)) #define instruction_pointer(regs) ((regs)->tpc) #define instruction_pointer_set(regs, val) ((regs)->tpc = (val)) @@ -100,6 +101,9 @@ static inline bool pt_regs_clear_syscall(struct pt_regs *regs) #define arch_ptrace_stop(exit_code, info) \ synchronize_user_stack() +#define current_pt_regs() \ + ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1) + #define user_mode(regs) (!((regs)->psr & PSR_PS)) #define instruction_pointer(regs) ((regs)->pc) #define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP]) diff --git a/arch/sparc/include/asm/switch_to_64.h b/arch/sparc/include/asm/switch_to_64.h index 7923c4a2be38..cad36f56fa03 100644 --- a/arch/sparc/include/asm/switch_to_64.h +++ b/arch/sparc/include/asm/switch_to_64.h @@ -23,7 +23,7 @@ do { flush_tlb_pending(); \ /* If you are tempted to conditionalize the following */ \ /* so that ASI is only written if it changes, think again. */ \ __asm__ __volatile__("wr %%g0, %0, %%asi" \ - : : "r" (__thread_flag_byte_ptr(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\ + : : "r" (task_thread_info(next)->current_ds));\ trap_block[current_thread_info()->cpu].thread = \ task_thread_info(next); \ __asm__ __volatile__( \ diff --git a/arch/sparc/include/asm/syscalls.h b/arch/sparc/include/asm/syscalls.h index 45a43f637a14..bf8972adea17 100644 --- a/arch/sparc/include/asm/syscalls.h +++ b/arch/sparc/include/asm/syscalls.h @@ -8,6 +8,4 @@ extern asmlinkage long sparc_do_fork(unsigned long clone_flags, struct pt_regs *regs, unsigned long stack_size); -extern asmlinkage int sparc_execve(struct pt_regs *regs); - #endif /* _SPARC64_SYSCALLS_H */ diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h index a3fe4dcc0aa6..269bd92313df 100644 --- a/arch/sparc/include/asm/thread_info_64.h +++ b/arch/sparc/include/asm/thread_info_64.h @@ -14,12 +14,12 @@ #define TI_FLAG_FAULT_CODE_SHIFT 56 #define TI_FLAG_BYTE_WSTATE 1 #define TI_FLAG_WSTATE_SHIFT 48 -#define TI_FLAG_BYTE_CWP 2 -#define TI_FLAG_CWP_SHIFT 40 -#define TI_FLAG_BYTE_CURRENT_DS 3 -#define TI_FLAG_CURRENT_DS_SHIFT 32 -#define TI_FLAG_BYTE_FPDEPTH 4 -#define TI_FLAG_FPDEPTH_SHIFT 24 +#define TI_FLAG_BYTE_NOERROR 2 +#define TI_FLAG_BYTE_NOERROR_SHIFT 40 +#define TI_FLAG_BYTE_FPDEPTH 3 +#define TI_FLAG_FPDEPTH_SHIFT 32 +#define TI_FLAG_BYTE_CWP 4 +#define TI_FLAG_CWP_SHIFT 24 #define TI_FLAG_BYTE_WSAVED 5 #define TI_FLAG_WSAVED_SHIFT 16 @@ -47,7 +47,7 @@ struct thread_info { struct exec_domain *exec_domain; int preempt_count; /* 0 => preemptable, <0 => BUG */ __u8 new_child; - __u8 syscall_noerror; + __u8 current_ds; __u16 cpu; unsigned long *utraps; @@ -74,9 +74,9 @@ struct thread_info { #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) -#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS) #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) +#define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR) #define TI_FPSAVED 0x00000010 #define TI_KSP 0x00000018 #define TI_FAULT_ADDR 0x00000020 @@ -84,7 +84,7 @@ struct thread_info { #define TI_EXEC_DOMAIN 0x00000030 #define TI_PRE_COUNT 0x00000038 #define TI_NEW_CHILD 0x0000003c -#define TI_SYS_NOERROR 0x0000003d +#define TI_CURRENT_DS 0x0000003d #define TI_CPU 0x0000003e #define TI_UTRAPS 0x00000040 #define TI_REG_WINDOW 0x00000048 @@ -121,7 +121,7 @@ struct thread_info { #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ - .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \ + .current_ds = ASI_P, \ .exec_domain = &default_exec_domain, \ .preempt_count = INIT_PREEMPT_COUNT, \ .restart_block = { \ @@ -153,13 +153,12 @@ register struct thread_info *current_thread_info_reg asm("g6"); #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) -#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS]) -#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val)) +#define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR]) +#define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val)) #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) - #endif /* !(__ASSEMBLY__) */ /* diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 73083e1d38d9..e562d3caee57 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -38,14 +38,14 @@ #define VERIFY_READ 0 #define VERIFY_WRITE 1 -#define get_fs() ((mm_segment_t) { get_thread_current_ds() }) +#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)}) #define get_ds() (KERNEL_DS) #define segment_eq(a,b) ((a).seg == (b).seg) #define set_fs(val) \ do { \ - set_thread_current_ds((val).seg); \ + current_thread_info()->current_ds =(val).seg; \ __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \ } while(0) diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h index 0ecea6ed943e..c3e5d8b64171 100644 --- a/arch/sparc/include/asm/unistd.h +++ b/arch/sparc/include/asm/unistd.h @@ -46,6 +46,7 @@ #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_COMPAT_SYS_SENDFILE #endif +#define __ARCH_WANT_SYS_EXECVE /* * "Conditional" syscalls diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S index dcaa1cf0de40..21fd1a8f47d2 100644 --- a/arch/sparc/kernel/entry.S +++ b/arch/sparc/kernel/entry.S @@ -806,23 +806,10 @@ sys_nis_syscall: call c_sys_nis_syscall mov %l5, %o7 - .align 4 - .globl sys_execve -sys_execve: - mov %o7, %l5 - add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg - call sparc_execve - mov %l5, %o7 - - .globl sunos_execv sunos_execv: - st %g0, [%sp + STACKFRAME_SZ + PT_I2] - - call sparc_execve - add %sp, STACKFRAME_SZ, %o0 - - b ret_sys_call - ld [%sp + STACKFRAME_SZ + PT_I0], %o0 + .globl sunos_execv + b sys_execve + clr %i2 .align 4 .globl sys_sparc_pipe @@ -959,17 +946,9 @@ flush_patch_four: .align 4 linux_sparc_ni_syscall: sethi %hi(sys_ni_syscall), %l7 - b syscall_is_too_hard + b do_syscall or %l7, %lo(sys_ni_syscall), %l7 -linux_fast_syscall: - andn %l7, 3, %l7 - mov %i0, %o0 - mov %i1, %o1 - mov %i2, %o2 - jmpl %l7 + %g0, %g0 - mov %i3, %o3 - linux_syscall_trace: add %sp, STACKFRAME_SZ, %o0 call syscall_trace @@ -991,6 +970,23 @@ ret_from_fork: b ret_sys_call ld [%sp + STACKFRAME_SZ + PT_I0], %o0 + .globl ret_from_kernel_thread +ret_from_kernel_thread: + call schedule_tail + ld [%g3 + TI_TASK], %o0 + ld [%sp + STACKFRAME_SZ + PT_G1], %l0 + call %l0 + ld [%sp + STACKFRAME_SZ + PT_G2], %o0 + rd %psr, %l1 + ld [%sp + STACKFRAME_SZ + PT_PSR], %l0 + andn %l0, PSR_CWP, %l0 + nop + and %l1, PSR_CWP, %l1 + or %l0, %l1, %l0 + st %l0, [%sp + STACKFRAME_SZ + PT_PSR] + b ret_sys_call + mov 0, %o0 + /* Linux native system calls enter here... */ .align 4 .globl linux_sparc_syscall @@ -1002,11 +998,8 @@ linux_sparc_syscall: bgeu linux_sparc_ni_syscall sll %g1, 2, %l4 ld [%l7 + %l4], %l7 - andcc %l7, 1, %g0 - bne linux_fast_syscall - /* Just do first insn from SAVE_ALL in the delay slot */ -syscall_is_too_hard: +do_syscall: SAVE_ALL_HEAD rd %wim, %l3 diff --git a/arch/sparc/kernel/etrap_64.S b/arch/sparc/kernel/etrap_64.S index 786b185e6e3f..1276ca2567ba 100644 --- a/arch/sparc/kernel/etrap_64.S +++ b/arch/sparc/kernel/etrap_64.S @@ -92,8 +92,10 @@ etrap_save: save %g2, -STACK_BIAS, %sp rdpr %wstate, %g2 wrpr %g0, 0, %canrestore sll %g2, 3, %g2 + + /* Set TI_SYS_FPDEPTH to 1 and clear TI_SYS_NOERROR. */ mov 1, %l5 - stb %l5, [%l6 + TI_FPDEPTH] + sth %l5, [%l6 + TI_SYS_NOERROR] wrpr %g3, 0, %otherwin wrpr %g2, 0, %wstate @@ -152,7 +154,9 @@ etrap_save: save %g2, -STACK_BIAS, %sp add %l6, TI_FPSAVED + 1, %l4 srl %l5, 1, %l3 add %l5, 2, %l5 - stb %l5, [%l6 + TI_FPDEPTH] + + /* Set TI_SYS_FPDEPTH to %l5 and clear TI_SYS_NOERROR. */ + sth %l5, [%l6 + TI_SYS_NOERROR] ba,pt %xcc, 2b stb %g0, [%l4 + %l3] nop diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c index 487bffb36f5e..bf4c6addce7b 100644 --- a/arch/sparc/kernel/process_32.c +++ b/arch/sparc/kernel/process_32.c @@ -316,9 +316,10 @@ asmlinkage int sparc_do_fork(unsigned long clone_flags, * XXX See comment above sys_vfork in sparc64. todo. */ extern void ret_from_fork(void); +extern void ret_from_kernel_thread(void); int copy_thread(unsigned long clone_flags, unsigned long sp, - unsigned long unused, + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct thread_info *ti = task_thread_info(p); @@ -336,16 +337,13 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, } /* - * p->thread_info new_stack childregs - * ! ! ! {if(PSR_PS) } - * V V (stk.fr.) V (pt_regs) { (stk.fr.) } - * +----- - - - - - ------+===========+============={+==========}+ + * p->thread_info new_stack childregs stack bottom + * ! ! ! ! + * V V (stk.fr.) V (pt_regs) V + * +----- - - - - - ------+===========+=============+ */ new_stack = task_stack_page(p) + THREAD_SIZE; - if (regs->psr & PSR_PS) - new_stack -= STACKFRAME_SZ; new_stack -= STACKFRAME_SZ + TRACEREG_SZ; - memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); /* @@ -356,55 +354,58 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, * Thus, kpsr|=PSR_PIL. */ ti->ksp = (unsigned long) new_stack; + p->thread.kregs = childregs; + + if (unlikely(p->flags & PF_KTHREAD)) { + extern int nwindows; + unsigned long psr; + memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ); + p->thread.flags |= SPARC_FLAG_KTHREAD; + p->thread.current_ds = KERNEL_DS; + ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8); + childregs->u_regs[UREG_G1] = sp; /* function */ + childregs->u_regs[UREG_G2] = arg; + psr = childregs->psr = get_psr(); + ti->kpsr = psr | PSR_PIL; + ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows); + return 0; + } + memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); + childregs->u_regs[UREG_FP] = sp; + p->thread.flags &= ~SPARC_FLAG_KTHREAD; + p->thread.current_ds = USER_DS; ti->kpc = (((unsigned long) ret_from_fork) - 0x8); ti->kpsr = current->thread.fork_kpsr | PSR_PIL; ti->kwim = current->thread.fork_kwim; - if(regs->psr & PSR_PS) { - extern struct pt_regs fake_swapper_regs; + if (sp != regs->u_regs[UREG_FP]) { + struct sparc_stackf __user *childstack; + struct sparc_stackf __user *parentstack; - p->thread.kregs = &fake_swapper_regs; - new_stack += STACKFRAME_SZ + TRACEREG_SZ; - childregs->u_regs[UREG_FP] = (unsigned long) new_stack; - p->thread.flags |= SPARC_FLAG_KTHREAD; - p->thread.current_ds = KERNEL_DS; - memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ); - childregs->u_regs[UREG_G6] = (unsigned long) ti; - } else { - p->thread.kregs = childregs; - childregs->u_regs[UREG_FP] = sp; - p->thread.flags &= ~SPARC_FLAG_KTHREAD; - p->thread.current_ds = USER_DS; - - if (sp != regs->u_regs[UREG_FP]) { - struct sparc_stackf __user *childstack; - struct sparc_stackf __user *parentstack; - - /* - * This is a clone() call with supplied user stack. - * Set some valid stack frames to give to the child. - */ - childstack = (struct sparc_stackf __user *) - (sp & ~0xfUL); - parentstack = (struct sparc_stackf __user *) - regs->u_regs[UREG_FP]; + /* + * This is a clone() call with supplied user stack. + * Set some valid stack frames to give to the child. + */ + childstack = (struct sparc_stackf __user *) + (sp & ~0xfUL); + parentstack = (struct sparc_stackf __user *) + regs->u_regs[UREG_FP]; #if 0 - printk("clone: parent stack:\n"); - show_stackframe(parentstack); + printk("clone: parent stack:\n"); + show_stackframe(parentstack); #endif - childstack = clone_stackframe(childstack, parentstack); - if (!childstack) - return -EFAULT; + childstack = clone_stackframe(childstack, parentstack); + if (!childstack) + return -EFAULT; #if 0 - printk("clone: child stack:\n"); - show_stackframe(childstack); + printk("clone: child stack:\n"); + show_stackframe(childstack); #endif - childregs->u_regs[UREG_FP] = (unsigned long)childstack; - } + childregs->u_regs[UREG_FP] = (unsigned long)childstack; } #ifdef CONFIG_SMP @@ -475,69 +476,6 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) return 1; } -/* - * sparc_execve() executes a new program after the asm stub has set - * things up for us. This should basically do what I want it to. - */ -asmlinkage int sparc_execve(struct pt_regs *regs) -{ - int error, base = 0; - struct filename *filename; - - /* Check for indirect call. */ - if(regs->u_regs[UREG_G1] == 0) - base = 1; - - filename = getname((char __user *)regs->u_regs[base + UREG_I0]); - error = PTR_ERR(filename); - if(IS_ERR(filename)) - goto out; - error = do_execve(filename->name, - (const char __user *const __user *) - regs->u_regs[base + UREG_I1], - (const char __user *const __user *) - regs->u_regs[base + UREG_I2], - regs); - putname(filename); -out: - return error; -} - -/* - * This is the mechanism for creating a new kernel thread. - * - * NOTE! Only a kernel-only process(ie the swapper or direct descendants - * who haven't done an "execve()") should use this: it will work within - * a system call from a "real" process, but the process memory space will - * not be freed until both the parent and the child have exited. - */ -pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ - long retval; - - __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */ - "mov %5, %%g3\n\t" /* and arg. */ - "mov %1, %%g1\n\t" - "mov %2, %%o0\n\t" /* Clone flags. */ - "mov 0, %%o1\n\t" /* usp arg == 0 */ - "t 0x10\n\t" /* Linux/Sparc clone(). */ - "cmp %%o1, 0\n\t" - "be 1f\n\t" /* The parent, just return. */ - " nop\n\t" /* Delay slot. */ - "jmpl %%g2, %%o7\n\t" /* Call the function. */ - " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */ - "mov %3, %%g1\n\t" - "t 0x10\n\t" /* Linux/Sparc exit(). */ - /* Notreached by child. */ - "1: mov %%o0, %0\n\t" : - "=r" (retval) : - "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), - "i" (__NR_exit), "r" (fn), "r" (arg) : - "g1", "g2", "g3", "o0", "o1", "memory", "cc"); - return retval; -} -EXPORT_SYMBOL(kernel_thread); - unsigned long get_wchan(struct task_struct *task) { unsigned long pc, fp, bias = 0; diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index c6e0c2910043..dff54f46728d 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -622,64 +622,55 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags, * Child --> %o0 == parents pid, %o1 == 1 */ int copy_thread(unsigned long clone_flags, unsigned long sp, - unsigned long unused, + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct thread_info *t = task_thread_info(p); struct sparc_stackf *parent_sf; unsigned long child_stack_sz; char *child_trap_frame; - int kernel_thread; - - kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; - parent_sf = ((struct sparc_stackf *) regs) - 1; /* Calculate offset to stack_frame & pt_regs */ - child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + - (kernel_thread ? STACKFRAME_SZ : 0)); + child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); child_trap_frame = (task_stack_page(p) + (THREAD_SIZE - child_stack_sz)); - memcpy(child_trap_frame, parent_sf, child_stack_sz); - t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | - (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | - (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); t->new_child = 1; t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; t->kregs = (struct pt_regs *) (child_trap_frame + sizeof(struct sparc_stackf)); t->fpsaved[0] = 0; - if (kernel_thread) { - struct sparc_stackf *child_sf = (struct sparc_stackf *) - (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); - - /* Zero terminate the stack backtrace. */ - child_sf->fp = NULL; - t->kregs->u_regs[UREG_FP] = - ((unsigned long) child_sf) - STACK_BIAS; + if (unlikely(p->flags & PF_KTHREAD)) { + memset(child_trap_frame, 0, child_stack_sz); + __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = + (current_pt_regs()->tstate + 1) & TSTATE_CWP; + t->current_ds = ASI_P; + t->kregs->u_regs[UREG_G1] = sp; /* function */ + t->kregs->u_regs[UREG_G2] = arg; + return 0; + } - t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); - t->kregs->u_regs[UREG_G6] = (unsigned long) t; - t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; - } else { - if (t->flags & _TIF_32BIT) { - sp &= 0x00000000ffffffffUL; - regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; - } - t->kregs->u_regs[UREG_FP] = sp; - t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); - if (sp != regs->u_regs[UREG_FP]) { - unsigned long csp; - - csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); - if (!csp) - return -EFAULT; - t->kregs->u_regs[UREG_FP] = csp; - } - if (t->utraps) - t->utraps[0]++; + parent_sf = ((struct sparc_stackf *) regs) - 1; + memcpy(child_trap_frame, parent_sf, child_stack_sz); + if (t->flags & _TIF_32BIT) { + sp &= 0x00000000ffffffffUL; + regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; } + t->kregs->u_regs[UREG_FP] = sp; + __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = + (regs->tstate + 1) & TSTATE_CWP; + t->current_ds = ASI_AIUS; + if (sp != regs->u_regs[UREG_FP]) { + unsigned long csp; + + csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); + if (!csp) + return -EFAULT; + t->kregs->u_regs[UREG_FP] = csp; + } + if (t->utraps) + t->utraps[0]++; /* Set the return value for the child. */ t->kregs->u_regs[UREG_I0] = current->pid; @@ -694,45 +685,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, return 0; } -/* - * This is the mechanism for creating a new kernel thread. - * - * NOTE! Only a kernel-only process(ie the swapper or direct descendants - * who haven't done an "execve()") should use this: it will work within - * a system call from a "real" process, but the process memory space will - * not be freed until both the parent and the child have exited. - */ -pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ - long retval; - - /* If the parent runs before fn(arg) is called by the child, - * the input registers of this function can be clobbered. - * So we stash 'fn' and 'arg' into global registers which - * will not be modified by the parent. - */ - __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ - "mov %5, %%g3\n\t" /* Save ARG into global */ - "mov %1, %%g1\n\t" /* Clone syscall nr. */ - "mov %2, %%o0\n\t" /* Clone flags. */ - "mov 0, %%o1\n\t" /* usp arg == 0 */ - "t 0x6d\n\t" /* Linux/Sparc clone(). */ - "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ - " mov %%o0, %0\n\t" - "jmpl %%g2, %%o7\n\t" /* Call the function. */ - " mov %%g3, %%o0\n\t" /* Set arg in delay. */ - "mov %3, %%g1\n\t" - "t 0x6d\n\t" /* Linux/Sparc exit(). */ - /* Notreached by child. */ - "1:" : - "=r" (retval) : - "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), - "i" (__NR_exit), "r" (fn), "r" (arg) : - "g1", "g2", "g3", "o0", "o1", "memory", "cc"); - return retval; -} -EXPORT_SYMBOL(kernel_thread); - typedef struct { union { unsigned int pr_regs[32]; @@ -799,41 +751,6 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) } EXPORT_SYMBOL(dump_fpu); -/* - * sparc_execve() executes a new program after the asm stub has set - * things up for us. This should basically do what I want it to. - */ -asmlinkage int sparc_execve(struct pt_regs *regs) -{ - int error, base = 0; - struct filename *filename; - - /* User register window flush is done by entry.S */ - - /* Check for indirect call. */ - if (regs->u_regs[UREG_G1] == 0) - base = 1; - - filename = getname((char __user *)regs->u_regs[base + UREG_I0]); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, - (const char __user *const __user *) - regs->u_regs[base + UREG_I1], - (const char __user *const __user *) - regs->u_regs[base + UREG_I2], regs); - putname(filename); - if (!error) { - fprs_write(0); - current_thread_info()->xfsr[0] = 0; - current_thread_info()->fpsaved[0] = 0; - regs->tstate &= ~TSTATE_PEF; - } -out: - return error; -} - unsigned long get_wchan(struct task_struct *task) { unsigned long pc, fp, bias = 0; diff --git a/arch/sparc/kernel/sys_sparc32.c b/arch/sparc/kernel/sys_sparc32.c index c3239811a1b5..03c7e929ec34 100644 --- a/arch/sparc/kernel/sys_sparc32.c +++ b/arch/sparc/kernel/sys_sparc32.c @@ -396,42 +396,6 @@ asmlinkage long compat_sys_rt_sigaction(int sig, return ret; } -/* - * sparc32_execve() executes a new program after the asm stub has set - * things up for us. This should basically do what I want it to. - */ -asmlinkage long sparc32_execve(struct pt_regs *regs) -{ - int error, base = 0; - struct filename *filename; - - /* User register window flush is done by entry.S */ - - /* Check for indirect call. */ - if ((u32)regs->u_regs[UREG_G1] == 0) - base = 1; - - filename = getname(compat_ptr(regs->u_regs[base + UREG_I0])); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - - error = compat_do_execve(filename->name, - compat_ptr(regs->u_regs[base + UREG_I1]), - compat_ptr(regs->u_regs[base + UREG_I2]), regs); - - putname(filename); - - if (!error) { - fprs_write(0); - current_thread_info()->xfsr[0] = 0; - current_thread_info()->fpsaved[0] = 0; - regs->tstate &= ~TSTATE_PEF; - } -out: - return error; -} - #ifdef CONFIG_MODULES asmlinkage long sys32_init_module(void __user *umod, u32 len, diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c index 0c9b31b22e07..a8e6eb0a11d5 100644 --- a/arch/sparc/kernel/sys_sparc_32.c +++ b/arch/sparc/kernel/sys_sparc_32.c @@ -258,27 +258,3 @@ out: up_read(&uts_sem); return err; } - -/* - * Do a system call from kernel instead of calling sys_execve so we - * end up with proper pt_regs. - */ -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - long __res; - register long __g1 __asm__ ("g1") = __NR_execve; - register long __o0 __asm__ ("o0") = (long)(filename); - register long __o1 __asm__ ("o1") = (long)(argv); - register long __o2 __asm__ ("o2") = (long)(envp); - asm volatile ("t 0x10\n\t" - "bcc 1f\n\t" - "mov %%o0, %0\n\t" - "sub %%g0, %%o0, %0\n\t" - "1:\n\t" - : "=r" (__res), "=&r" (__o0) - : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) - : "cc"); - return __res; -} diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index 878ef3d5fec5..51b85feb8b97 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -730,28 +730,6 @@ SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, return ret; } -/* - * Do a system call from kernel instead of calling sys_execve so we - * end up with proper pt_regs. - */ -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - long __res; - register long __g1 __asm__ ("g1") = __NR_execve; - register long __o0 __asm__ ("o0") = (long)(filename); - register long __o1 __asm__ ("o1") = (long)(argv); - register long __o2 __asm__ ("o2") = (long)(envp); - asm volatile ("t 0x6d\n\t" - "sub %%g0, %%o0, %0\n\t" - "movcc %%xcc, %%o0, %0\n\t" - : "=r" (__res), "=&r" (__o0) - : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) - : "cc"); - return __res; -} - asmlinkage long sys_kern_features(void) { return KERN_FEATURE_MIXED_MODE_STACK; diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S index 7f5f65d0b3fd..2ef41e67f0be 100644 --- a/arch/sparc/kernel/syscalls.S +++ b/arch/sparc/kernel/syscalls.S @@ -1,23 +1,19 @@ /* SunOS's execv() call only specifies the argv argument, the * environment settings are the same as the calling processes. */ -sys_execve: - sethi %hi(sparc_execve), %g1 - ba,pt %xcc, execve_merge - or %g1, %lo(sparc_execve), %g1 +sys64_execve: + set sys_execve, %g1 + jmpl %g1, %g0 + flushw #ifdef CONFIG_COMPAT sunos_execv: - stx %g0, [%sp + PTREGS_OFF + PT_V9_I2] + mov %g0, %o2 sys32_execve: - sethi %hi(sparc32_execve), %g1 - or %g1, %lo(sparc32_execve), %g1 -#endif - -execve_merge: - flushw + set compat_sys_execve, %g1 jmpl %g1, %g0 - add %sp, PTREGS_OFF, %o0 + flushw +#endif .align 32 sys_sparc_pipe: @@ -112,11 +108,16 @@ sys_clone: ret_from_syscall: /* Clear current_thread_info()->new_child. */ stb %g0, [%g6 + TI_NEW_CHILD] - ldx [%g6 + TI_FLAGS], %l0 call schedule_tail mov %g7, %o0 + ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 + brnz,pt %o0, ret_sys_call + ldx [%g6 + TI_FLAGS], %l0 + ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 + call %l1 + ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 ba,pt %xcc, ret_sys_call - ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 + mov 0, %o0 .globl sparc_exit .type sparc_exit,#function @@ -222,7 +223,6 @@ ret_sys_call: ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 2: - stb %g0, [%g6 + TI_SYS_NOERROR] /* System call success, clear Carry condition code. */ andn %g3, %g2, %g3 3: diff --git a/arch/sparc/kernel/systbls_64.S b/arch/sparc/kernel/systbls_64.S index 1c9af9fa38e9..ebb7f5fc58fb 100644 --- a/arch/sparc/kernel/systbls_64.S +++ b/arch/sparc/kernel/systbls_64.S @@ -107,7 +107,7 @@ sys_call_table: /*40*/ .word sys_newlstat, sys_dup, sys_sparc_pipe, sys_times, sys_nis_syscall .word sys_umount, sys_setgid, sys_getgid, sys_signal, sys_geteuid /*50*/ .word sys_getegid, sys_acct, sys_memory_ordering, sys_nis_syscall, sys_ioctl - .word sys_reboot, sys_nis_syscall, sys_symlink, sys_readlink, sys_execve + .word sys_reboot, sys_nis_syscall, sys_symlink, sys_readlink, sys64_execve /*60*/ .word sys_umask, sys_chroot, sys_newfstat, sys_fstat64, sys_getpagesize .word sys_msync, sys_vfork, sys_pread64, sys_pwrite64, sys_nis_syscall /*70*/ .word sys_nis_syscall, sys_mmap, sys_nis_syscall, sys_64_munmap, sys_mprotect diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index b66a77968f35..e7ecf1507d90 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -2688,8 +2688,8 @@ void __init trap_init(void) TI_PRE_COUNT != offsetof(struct thread_info, preempt_count) || TI_NEW_CHILD != offsetof(struct thread_info, new_child) || - TI_SYS_NOERROR != offsetof(struct thread_info, - syscall_noerror) || + TI_CURRENT_DS != offsetof(struct thread_info, + current_ds) || TI_RESTART_BLOCK != offsetof(struct thread_info, restart_block) || TI_KUNA_REGS != offsetof(struct thread_info, diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 9e28a118e6a4..85be1ca539b2 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -624,7 +624,7 @@ static void __init inherit_prom_mappings(void) void prom_world(int enter) { if (!enter) - set_fs((mm_segment_t) { get_thread_current_ds() }); + set_fs(get_fs()); __asm__ __volatile__("flushw"); } diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 875d008828b8..ea7f61e8bc9e 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -21,6 +21,8 @@ config TILE select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE # FIXME: investigate whether we need/want these options. # select HAVE_IOREMAP_PROT diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index 3063e6fc8daa..ca61fb4296b3 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -275,18 +275,14 @@ extern int compat_setup_rt_frame(int sig, struct k_sigaction *ka, struct compat_sigaction; struct compat_siginfo; struct compat_sigaltstack; -long compat_sys_execve(const char __user *path, - compat_uptr_t __user *argv, - compat_uptr_t __user *envp, struct pt_regs *); long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act, struct compat_sigaction __user *oact, size_t sigsetsize); long compat_sys_rt_sigqueueinfo(int pid, int sig, struct compat_siginfo __user *uinfo); -long compat_sys_rt_sigreturn(struct pt_regs *); +long compat_sys_rt_sigreturn(void); long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, - struct compat_sigaltstack __user *uoss_ptr, - struct pt_regs *); + struct compat_sigaltstack __user *uoss_ptr); long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high); long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high); long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count, @@ -303,12 +299,7 @@ long compat_sys_fallocate(int fd, int mode, long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval); -/* These are the intvec_64.S trampolines. */ -long _compat_sys_execve(const char __user *path, - const compat_uptr_t __user *argv, - const compat_uptr_t __user *envp); -long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, - struct compat_sigaltstack __user *uoss_ptr); +/* Assembly trampoline to avoid clobbering r0. */ long _compat_sys_rt_sigreturn(void); #endif /* _ASM_TILE_COMPAT_H */ diff --git a/arch/tile/include/asm/elf.h b/arch/tile/include/asm/elf.h index f8ccf08f6934..b73e1039c911 100644 --- a/arch/tile/include/asm/elf.h +++ b/arch/tile/include/asm/elf.h @@ -148,6 +148,7 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm, #define compat_start_thread(regs, ip, usp) do { \ regs->pc = ptr_to_compat_reg((void *)(ip)); \ regs->sp = ptr_to_compat_reg((void *)(usp)); \ + single_step_execve(); \ } while (0) /* diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index 8c4dd9ff91eb..879073e76586 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -211,6 +211,7 @@ static inline void start_thread(struct pt_regs *regs, { regs->pc = pc; regs->sp = usp; + single_step_execve(); } /* Free all resources held by a thread. */ @@ -239,6 +240,9 @@ unsigned long get_wchan(struct task_struct *p); #define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA) #define task_pt_regs(task) \ ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1) +#define current_pt_regs() \ + ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \ + (KSTK_PTREGS_GAP - 1)) - 1) #define task_sp(task) (task_pt_regs(task)->sp) #define task_pc(task) (task_pt_regs(task)->pc) /* Aliases for pc and sp (used in fs/proc/array.c) */ diff --git a/arch/tile/include/asm/switch_to.h b/arch/tile/include/asm/switch_to.h index 1d48c5fee8b7..b8f888cbe6b0 100644 --- a/arch/tile/include/asm/switch_to.h +++ b/arch/tile/include/asm/switch_to.h @@ -68,7 +68,10 @@ extern unsigned long get_switch_to_pc(void); /* Support function for forking a new task. */ void ret_from_fork(void); -/* Called from ret_from_fork() when a new process starts up. */ +/* Support function for forking a new kernel thread. */ +void ret_from_kernel_thread(void *fn, void *arg); + +/* Called from ret_from_xxx() when a new process starts up. */ struct task_struct *sim_notify_fork(struct task_struct *prev); #endif /* !__ASSEMBLY__ */ diff --git a/arch/tile/include/asm/syscalls.h b/arch/tile/include/asm/syscalls.h index 06f0464cfed9..369696d63e7b 100644 --- a/arch/tile/include/asm/syscalls.h +++ b/arch/tile/include/asm/syscalls.h @@ -51,8 +51,7 @@ long sys_cacheflush(unsigned long addr, unsigned long len, #ifndef __tilegx__ /* mm/fault.c */ -long sys_cmpxchg_badaddr(unsigned long address, struct pt_regs *); -long _sys_cmpxchg_badaddr(unsigned long address); +long sys_cmpxchg_badaddr(unsigned long address); #endif #ifdef CONFIG_COMPAT @@ -63,14 +62,23 @@ long sys_truncate64(const char __user *path, loff_t length); long sys_ftruncate64(unsigned int fd, loff_t length); #endif +/* Provide versions of standard syscalls that use current_pt_regs(). */ +long sys_clone(unsigned long clone_flags, unsigned long newsp, + void __user *parent_tid, void __user *child_tid); +long sys_execve(const char __user *filename, + const char __user *const __user *argv, + const char __user *const __user *envp); +long sys_rt_sigreturn(void); +long sys_sigaltstack(const stack_t __user *, stack_t __user *); +#define sys_clone sys_clone +#define sys_execve sys_execve +#define sys_rt_sigreturn sys_rt_sigreturn +#define sys_sigaltstack sys_sigaltstack + /* These are the intvec*.S trampolines. */ -long _sys_sigaltstack(const stack_t __user *, stack_t __user *); long _sys_rt_sigreturn(void); long _sys_clone(unsigned long clone_flags, unsigned long newsp, void __user *parent_tid, void __user *child_tid); -long _sys_execve(const char __user *filename, - const char __user *const __user *argv, - const char __user *const __user *envp); #include <asm-generic/syscalls.h> diff --git a/arch/tile/include/asm/unistd.h b/arch/tile/include/asm/unistd.h index 6e032a0a268e..dab827dc8acb 100644 --- a/arch/tile/include/asm/unistd.h +++ b/arch/tile/include/asm/unistd.h @@ -16,4 +16,5 @@ #define __ARCH_WANT_SYS_LLSEEK #endif #define __ARCH_WANT_SYS_NEWFSTATAT +#define __ARCH_WANT_SYS_EXECVE #include <uapi/asm/unistd.h> diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c index d67459b9ac2a..a2e805569d5d 100644 --- a/arch/tile/kernel/compat.c +++ b/arch/tile/kernel/compat.c @@ -102,10 +102,9 @@ long compat_sys_sched_rr_get_interval(compat_pid_t pid, #define compat_sys_fadvise64_64 sys32_fadvise64_64 #define compat_sys_readahead sys32_readahead -/* Call the trampolines to manage pt_regs where necessary. */ -#define compat_sys_execve _compat_sys_execve -#define compat_sys_sigaltstack _compat_sys_sigaltstack +/* Call the assembly trampolines where necessary. */ #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn +#undef sys_clone #define sys_clone _sys_clone /* diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c index 08b4fe1717bb..210a9bbae963 100644 --- a/arch/tile/kernel/compat_signal.c +++ b/arch/tile/kernel/compat_signal.c @@ -197,8 +197,7 @@ int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) } long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, - struct compat_sigaltstack __user *uoss_ptr, - struct pt_regs *regs) + struct compat_sigaltstack __user *uoss_ptr) { stack_t uss, uoss; int ret; @@ -219,7 +218,7 @@ long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, set_fs(KERNEL_DS); ret = do_sigaltstack(uss_ptr ? (stack_t __user __force *)&uss : NULL, (stack_t __user __force *)&uoss, - (unsigned long)compat_ptr(regs->sp)); + (unsigned long)compat_ptr(current_pt_regs()->sp)); set_fs(seg); if (ret >= 0 && uoss_ptr) { if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(*uoss_ptr)) || @@ -232,8 +231,9 @@ long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, } /* The assembly shim for this function arranges to ignore the return value. */ -long compat_sys_rt_sigreturn(struct pt_regs *regs) +long compat_sys_rt_sigreturn(void) { + struct pt_regs *regs = current_pt_regs(); struct compat_rt_sigframe __user *frame = (struct compat_rt_sigframe __user *) compat_ptr(regs->sp); sigset_t set; @@ -248,7 +248,7 @@ long compat_sys_rt_sigreturn(struct pt_regs *regs) if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; - if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0) + if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL) != 0) goto badframe; return 0; diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S index c31637baff28..f116cb0bce20 100644 --- a/arch/tile/kernel/entry.S +++ b/arch/tile/kernel/entry.S @@ -28,17 +28,6 @@ STD_ENTRY(current_text_addr) STD_ENDPROC(current_text_addr) /* - * Implement execve(). The i386 code has a note that forking from kernel - * space results in no copy on write until the execve, so we should be - * careful not to write to the stack here. - */ -STD_ENTRY(kernel_execve) - moveli TREG_SYSCALL_NR_NAME, __NR_execve - swint1 - jrp lr - STD_ENDPROC(kernel_execve) - -/* * We don't run this function directly, but instead copy it to a page * we map into every user process. See vdso_setup(). * diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S index 6943515100f8..f212bf7cea86 100644 --- a/arch/tile/kernel/intvec_32.S +++ b/arch/tile/kernel/intvec_32.S @@ -1291,6 +1291,21 @@ STD_ENTRY(ret_from_fork) } STD_ENDPROC(ret_from_fork) +STD_ENTRY(ret_from_kernel_thread) + jal sim_notify_fork + jal schedule_tail + FEEDBACK_REENTER(ret_from_fork) + { + move r0, r31 + jalr r30 + } + FEEDBACK_REENTER(ret_from_kernel_thread) + { + movei r30, 0 /* not an NMI */ + j .Lresume_userspace /* jump into middle of interrupt_return */ + } + STD_ENDPROC(ret_from_kernel_thread) + /* * Code for ill interrupt. */ @@ -1437,15 +1452,6 @@ STD_ENTRY_LOCAL(bad_intr) panic "Unhandled interrupt %#x: PC %#lx" STD_ENDPROC(bad_intr) -/* Put address of pt_regs in reg and jump. */ -#define PTREGS_SYSCALL(x, reg) \ - STD_ENTRY(_##x); \ - { \ - PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \ - j x \ - }; \ - STD_ENDPROC(_##x) - /* * Special-case sigreturn to not write r0 to the stack on return. * This is technically more efficient, but it also avoids difficulties @@ -1461,12 +1467,9 @@ STD_ENTRY_LOCAL(bad_intr) }; \ STD_ENDPROC(_##x) -PTREGS_SYSCALL(sys_execve, r3) -PTREGS_SYSCALL(sys_sigaltstack, r2) PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0) -PTREGS_SYSCALL(sys_cmpxchg_badaddr, r1) -/* Save additional callee-saves to pt_regs, put address in r4 and jump. */ +/* Save additional callee-saves to pt_regs and jump to standard function. */ STD_ENTRY(_sys_clone) push_extra_callee_saves r4 j sys_clone diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 7c06d597ffd0..54bc9a6678e8 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -1150,6 +1150,21 @@ STD_ENTRY(ret_from_fork) } STD_ENDPROC(ret_from_fork) +STD_ENTRY(ret_from_kernel_thread) + jal sim_notify_fork + jal schedule_tail + FEEDBACK_REENTER(ret_from_fork) + { + move r0, r31 + jalr r30 + } + FEEDBACK_REENTER(ret_from_kernel_thread) + { + movei r30, 0 /* not an NMI */ + j .Lresume_userspace /* jump into middle of interrupt_return */ + } + STD_ENDPROC(ret_from_kernel_thread) + /* Various stub interrupt handlers and syscall handlers */ STD_ENTRY_LOCAL(_kernel_double_fault) @@ -1166,15 +1181,6 @@ STD_ENTRY_LOCAL(bad_intr) panic "Unhandled interrupt %#x: PC %#lx" STD_ENDPROC(bad_intr) -/* Put address of pt_regs in reg and jump. */ -#define PTREGS_SYSCALL(x, reg) \ - STD_ENTRY(_##x); \ - { \ - PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \ - j x \ - }; \ - STD_ENDPROC(_##x) - /* * Special-case sigreturn to not write r0 to the stack on return. * This is technically more efficient, but it also avoids difficulties @@ -1190,16 +1196,12 @@ STD_ENTRY_LOCAL(bad_intr) }; \ STD_ENDPROC(_##x) -PTREGS_SYSCALL(sys_execve, r3) -PTREGS_SYSCALL(sys_sigaltstack, r2) PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0) #ifdef CONFIG_COMPAT -PTREGS_SYSCALL(compat_sys_execve, r3) -PTREGS_SYSCALL(compat_sys_sigaltstack, r2) PTREGS_SYSCALL_SIGRETURN(compat_sys_rt_sigreturn, r0) #endif -/* Save additional callee-saves to pt_regs, put address in r4 and jump. */ +/* Save additional callee-saves to pt_regs and jump to standard function. */ STD_ENTRY(_sys_clone) push_extra_callee_saves r4 j sys_clone diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index 307d010696c9..1c20029d2f5a 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -157,24 +157,44 @@ void arch_release_thread_info(struct thread_info *info) static void save_arch_state(struct thread_struct *t); int copy_thread(unsigned long clone_flags, unsigned long sp, - unsigned long stack_size, - struct task_struct *p, struct pt_regs *regs) + unsigned long arg, + struct task_struct *p, struct pt_regs *unused) { - struct pt_regs *childregs; + struct pt_regs *childregs = task_pt_regs(p); unsigned long ksp; + unsigned long *callee_regs; /* - * When creating a new kernel thread we pass sp as zero. - * Assign it to a reasonable value now that we have the stack. + * Set up the stack and stack pointer appropriately for the + * new child to find itself woken up in __switch_to(). + * The callee-saved registers must be on the stack to be read; + * the new task will then jump to assembly support to handle + * calling schedule_tail(), etc., and (for userspace tasks) + * returning to the context set up in the pt_regs. */ - if (sp == 0 && regs->ex1 == PL_ICS_EX1(KERNEL_PL, 0)) - sp = KSTK_TOP(p); + ksp = (unsigned long) childregs; + ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */ + ((long *)ksp)[0] = ((long *)ksp)[1] = 0; + ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long); + callee_regs = (unsigned long *)ksp; + ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */ + ((long *)ksp)[0] = ((long *)ksp)[1] = 0; + p->thread.ksp = ksp; - /* - * Do not clone step state from the parent; each thread - * must make its own lazily. - */ - task_thread_info(p)->step_state = NULL; + /* Record the pid of the task that created this one. */ + p->thread.creator_pid = current->pid; + + if (unlikely(p->flags & PF_KTHREAD)) { + /* kernel thread */ + memset(childregs, 0, sizeof(struct pt_regs)); + memset(&callee_regs[2], 0, + (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long)); + callee_regs[0] = sp; /* r30 = function */ + callee_regs[1] = arg; /* r31 = arg */ + childregs->ex1 = PL_ICS_EX1(KERNEL_PL, 0); + p->thread.pc = (unsigned long) ret_from_kernel_thread; + return 0; + } /* * Start new thread in ret_from_fork so it schedules properly @@ -182,46 +202,33 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, */ p->thread.pc = (unsigned long) ret_from_fork; - /* Save user stack top pointer so we can ID the stack vm area later. */ - p->thread.usp0 = sp; - - /* Record the pid of the process that created this one. */ - p->thread.creator_pid = current->pid; + /* + * Do not clone step state from the parent; each thread + * must make its own lazily. + */ + task_thread_info(p)->step_state = NULL; /* * Copy the registers onto the kernel stack so the * return-from-interrupt code will reload it into registers. */ - childregs = task_pt_regs(p); - *childregs = *regs; + *childregs = *current_pt_regs(); childregs->regs[0] = 0; /* return value is zero */ - childregs->sp = sp; /* override with new user stack pointer */ + if (sp) + childregs->sp = sp; /* override with new user stack pointer */ + memcpy(callee_regs, &childregs->regs[CALLEE_SAVED_FIRST_REG], + CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long)); + + /* Save user stack top pointer so we can ID the stack vm area later. */ + p->thread.usp0 = childregs->sp; /* * If CLONE_SETTLS is set, set "tp" in the new task to "r4", * which is passed in as arg #5 to sys_clone(). */ if (clone_flags & CLONE_SETTLS) - childregs->tp = regs->regs[4]; + childregs->tp = childregs->regs[4]; - /* - * Copy the callee-saved registers from the passed pt_regs struct - * into the context-switch callee-saved registers area. - * This way when we start the interrupt-return sequence, the - * callee-save registers will be correctly in registers, which - * is how we assume the compiler leaves them as we start doing - * the normal return-from-interrupt path after calling C code. - * Zero out the C ABI save area to mark the top of the stack. - */ - ksp = (unsigned long) childregs; - ksp -= C_ABI_SAVE_AREA_SIZE; /* interrupt-entry save area */ - ((long *)ksp)[0] = ((long *)ksp)[1] = 0; - ksp -= CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long); - memcpy((void *)ksp, ®s->regs[CALLEE_SAVED_FIRST_REG], - CALLEE_SAVED_REGS_COUNT * sizeof(unsigned long)); - ksp -= C_ABI_SAVE_AREA_SIZE; /* __switch_to() save area */ - ((long *)ksp)[0] = ((long *)ksp)[1] = 0; - p->thread.ksp = ksp; #if CHIP_HAS_TILE_DMA() /* @@ -578,61 +585,13 @@ int do_work_pending(struct pt_regs *regs, u32 thread_info_flags) } /* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */ -SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, - void __user *, parent_tidptr, void __user *, child_tidptr, - struct pt_regs *, regs) +SYSCALL_DEFINE4(clone, unsigned long, clone_flags, unsigned long, newsp, + void __user *, parent_tidptr, void __user *, child_tidptr) { - if (!newsp) - newsp = regs->sp; - return do_fork(clone_flags, newsp, regs, 0, + return do_fork(clone_flags, newsp, current_pt_regs(), 0, parent_tidptr, child_tidptr); } -/* - * sys_execve() executes a new program. - */ -SYSCALL_DEFINE4(execve, const char __user *, path, - const char __user *const __user *, argv, - const char __user *const __user *, envp, - struct pt_regs *, regs) -{ - long error; - struct filename *filename; - - filename = getname(path); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, argv, envp, regs); - putname(filename); - if (error == 0) - single_step_execve(); -out: - return error; -} - -#ifdef CONFIG_COMPAT -long compat_sys_execve(const char __user *path, - compat_uptr_t __user *argv, - compat_uptr_t __user *envp, - struct pt_regs *regs) -{ - long error; - struct filename *filename; - - filename = getname(path); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = compat_do_execve(filename->name, argv, envp, regs); - putname(filename); - if (error == 0) - single_step_execve(); -out: - return error; -} -#endif - unsigned long get_wchan(struct task_struct *p) { struct KBacktraceIterator kbt; @@ -650,37 +609,6 @@ unsigned long get_wchan(struct task_struct *p) return 0; } -/* - * We pass in lr as zero (cleared in kernel_thread) and the caller - * part of the backtrace ABI on the stack also zeroed (in copy_thread) - * so that backtraces will stop with this function. - * Note that we don't use r0, since copy_thread() clears it. - */ -static void start_kernel_thread(int dummy, int (*fn)(int), int arg) -{ - do_exit(fn(arg)); -} - -/* - * Create a kernel thread - */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - regs.ex1 = PL_ICS_EX1(KERNEL_PL, 0); /* run at kernel PL, no ICS */ - regs.pc = (long) start_kernel_thread; - regs.flags = PT_FLAGS_CALLER_SAVES; /* need to restore r1 and r2 */ - regs.regs[1] = (long) fn; /* function pointer */ - regs.regs[2] = (long) arg; /* parameter register */ - - /* Ok, create the new process.. */ - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, - 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - /* Flush thread state. */ void flush_thread(void) { diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c index 67efb656d104..657a7ace4ab4 100644 --- a/arch/tile/kernel/signal.c +++ b/arch/tile/kernel/signal.c @@ -37,10 +37,10 @@ #define DEBUG_SIG 0 -SYSCALL_DEFINE3(sigaltstack, const stack_t __user *, uss, - stack_t __user *, uoss, struct pt_regs *, regs) +SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, + stack_t __user *, uoss) { - return do_sigaltstack(uss, uoss, regs->sp); + return do_sigaltstack(uss, uoss, current_pt_regs()->sp); } @@ -83,8 +83,9 @@ void signal_fault(const char *type, struct pt_regs *regs, } /* The assembly shim for this function arranges to ignore the return value. */ -SYSCALL_DEFINE1(rt_sigreturn, struct pt_regs *, regs) +SYSCALL_DEFINE0(rt_sigreturn) { + struct pt_regs *regs = current_pt_regs(); struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->sp); sigset_t set; diff --git a/arch/tile/kernel/sys.c b/arch/tile/kernel/sys.c index b08095b402d6..02ff5c0ef775 100644 --- a/arch/tile/kernel/sys.c +++ b/arch/tile/kernel/sys.c @@ -106,14 +106,11 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, #define sys_readahead sys32_readahead #endif -/* Call the trampolines to manage pt_regs where necessary. */ -#define sys_execve _sys_execve -#define sys_sigaltstack _sys_sigaltstack +/* Call the assembly trampolines where necessary. */ +#undef sys_rt_sigreturn #define sys_rt_sigreturn _sys_rt_sigreturn +#undef sys_clone #define sys_clone _sys_clone -#ifndef __tilegx__ -#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr -#endif /* * Note that we can't include <linux/unistd.h> here since the header diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c index fe811fa5f1b9..3d2b81c163a6 100644 --- a/arch/tile/mm/fault.c +++ b/arch/tile/mm/fault.c @@ -70,9 +70,10 @@ static noinline void force_sig_info_fault(const char *type, int si_signo, * Synthesize the fault a PL0 process would get by doing a word-load of * an unaligned address or a high kernel address. */ -SYSCALL_DEFINE2(cmpxchg_badaddr, unsigned long, address, - struct pt_regs *, regs) +SYSCALL_DEFINE1(cmpxchg_badaddr, unsigned long, address) { + struct pt_regs *regs = current_pt_regs(); + if (address >= PAGE_OFFSET) force_sig_info_fault("atomic segfault", SIGSEGV, SEGV_MAPERR, address, INT_DTLB_MISS, current, regs); |
