diff options
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/cpufreq/loongson2_clock.c | 4 | ||||
| -rw-r--r-- | arch/mips/kernel/process.c | 7 | ||||
| -rw-r--r-- | arch/mips/kernel/signal-common.h | 5 | ||||
| -rw-r--r-- | arch/mips/kernel/signal.c | 86 | ||||
| -rw-r--r-- | arch/mips/kernel/signal32.c | 55 | ||||
| -rw-r--r-- | arch/mips/kernel/signal_n32.c | 26 | ||||
| -rw-r--r-- | arch/mips/kernel/smtc.c | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/syscall.c | 6 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/vdso.c | 112 |
11 files changed, 169 insertions, 138 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index ef20957ca14b..7a6ac501cbb5 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -6,7 +6,7 @@ extra-y := head.o init_task.o vmlinux.lds obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \ ptrace.o reset.o setup.o signal.o syscall.o \ - time.o topology.o traps.o unaligned.o watch.o + time.o topology.o traps.o unaligned.o watch.o vdso.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_ftrace.o = -pg diff --git a/arch/mips/kernel/cpufreq/loongson2_clock.c b/arch/mips/kernel/cpufreq/loongson2_clock.c index d7ca256e33ef..cefc6e259baf 100644 --- a/arch/mips/kernel/cpufreq/loongson2_clock.c +++ b/arch/mips/kernel/cpufreq/loongson2_clock.c @@ -164,3 +164,7 @@ void loongson2_cpu_wait(void) spin_unlock_irqrestore(&loongson2_wait_lock, flags); } EXPORT_SYMBOL_GPL(loongson2_cpu_wait); + +MODULE_AUTHOR("Yanhua <yanh@lemote.com>"); +MODULE_DESCRIPTION("cpufreq driver for Loongson 2F"); +MODULE_LICENSE("GPL"); diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 463b71b90a00..99960940d4a4 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -63,8 +63,13 @@ void __noreturn cpu_idle(void) smtc_idle_loop_hook(); #endif - if (cpu_wait) + + if (cpu_wait) { + /* Don't trace irqs off for idle */ + stop_critical_timings(); (*cpu_wait)(); + start_critical_timings(); + } } #ifdef CONFIG_HOTPLUG_CPU if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) && diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h index 6c8e8c4246f7..10263b405981 100644 --- a/arch/mips/kernel/signal-common.h +++ b/arch/mips/kernel/signal-common.h @@ -26,11 +26,6 @@ */ extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size); -/* - * install trampoline code to get back from the sig handler - */ -extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall); - /* Check and clear pending FPU exceptions in saved CSR */ extern int fpcsr_pending(unsigned int __user *fpcsr); diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index d0c68b5d717b..2099d5a4c4b7 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -32,6 +32,7 @@ #include <asm/ucontext.h> #include <asm/cpu-features.h> #include <asm/war.h> +#include <asm/vdso.h> #include "signal-common.h" @@ -44,47 +45,20 @@ extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); -/* - * Horribly complicated - with the bloody RM9000 workarounds enabled - * the signal trampolines is moving to the end of the structure so we can - * increase the alignment without breaking software compatibility. - */ -#if ICACHE_REFILLS_WORKAROUND_WAR == 0 - struct sigframe { u32 sf_ass[4]; /* argument save space for o32 */ - u32 sf_code[2]; /* signal trampoline */ + u32 sf_pad[2]; /* Was: signal trampoline */ struct sigcontext sf_sc; sigset_t sf_mask; }; struct rt_sigframe { u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_code[2]; /* signal trampoline */ + u32 rs_pad[2]; /* Was: signal trampoline */ struct siginfo rs_info; struct ucontext rs_uc; }; -#else - -struct sigframe { - u32 sf_ass[4]; /* argument save space for o32 */ - u32 sf_pad[2]; - struct sigcontext sf_sc; /* hw context */ - sigset_t sf_mask; - u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ -}; - -struct rt_sigframe { - u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_pad[2]; - struct siginfo rs_info; - struct ucontext rs_uc; - u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ -}; - -#endif - /* * Helper routines */ @@ -266,32 +240,6 @@ void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); } -int install_sigtramp(unsigned int __user *tramp, unsigned int syscall) -{ - int err; - - /* - * Set up the return code ... - * - * li v0, __NR__foo_sigreturn - * syscall - */ - - err = __put_user(0x24020000 + syscall, tramp + 0); - err |= __put_user(0x0000000c , tramp + 1); - if (ICACHE_REFILLS_WORKAROUND_WAR) { - err |= __put_user(0, tramp + 2); - err |= __put_user(0, tramp + 3); - err |= __put_user(0, tramp + 4); - err |= __put_user(0, tramp + 5); - err |= __put_user(0, tramp + 6); - err |= __put_user(0, tramp + 7); - } - flush_cache_sigtramp((unsigned long) tramp); - - return err; -} - /* * Atomically swap in the new signal mask, and wait for a signal. */ @@ -484,8 +432,8 @@ badframe: } #ifdef CONFIG_TRAD_SIGNALS -static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, - int signr, sigset_t *set) +static int setup_frame(void *sig_return, struct k_sigaction *ka, + struct pt_regs *regs, int signr, sigset_t *set) { struct sigframe __user *frame; int err = 0; @@ -494,8 +442,6 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; - err |= install_sigtramp(frame->sf_code, __NR_sigreturn); - err |= setup_sigcontext(regs, &frame->sf_sc); err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); if (err) @@ -515,7 +461,7 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, regs->regs[ 5] = 0; regs->regs[ 6] = (unsigned long) &frame->sf_sc; regs->regs[29] = (unsigned long) frame; - regs->regs[31] = (unsigned long) frame->sf_code; + regs->regs[31] = (unsigned long) sig_return; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", @@ -529,8 +475,9 @@ give_sigsegv: } #endif -static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, - int signr, sigset_t *set, siginfo_t *info) +static int setup_rt_frame(void *sig_return, struct k_sigaction *ka, + struct pt_regs *regs, int signr, sigset_t *set, + siginfo_t *info) { struct rt_sigframe __user *frame; int err = 0; @@ -539,8 +486,6 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; - err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn); - /* Create siginfo. */ err |= copy_siginfo_to_user(&frame->rs_info, info); @@ -573,7 +518,7 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, regs->regs[ 5] = (unsigned long) &frame->rs_info; regs->regs[ 6] = (unsigned long) &frame->rs_uc; regs->regs[29] = (unsigned long) frame; - regs->regs[31] = (unsigned long) frame->rs_code; + regs->regs[31] = (unsigned long) sig_return; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", @@ -590,8 +535,11 @@ give_sigsegv: struct mips_abi mips_abi = { #ifdef CONFIG_TRAD_SIGNALS .setup_frame = setup_frame, + .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), #endif .setup_rt_frame = setup_rt_frame, + .rt_signal_return_offset = + offsetof(struct mips_vdso, rt_signal_trampoline), .restart = __NR_restart_syscall }; @@ -599,6 +547,8 @@ static int handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) { int ret; + struct mips_abi *abi = current->thread.abi; + void *vdso = current->mm->context.vdso; switch(regs->regs[0]) { case ERESTART_RESTARTBLOCK: @@ -619,9 +569,11 @@ static int handle_signal(unsigned long sig, siginfo_t *info, regs->regs[0] = 0; /* Don't deal with this again. */ if (sig_uses_siginfo(ka)) - ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); + ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, + ka, regs, sig, oldset, info); else - ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); + ret = abi->setup_frame(vdso + abi->signal_return_offset, + ka, regs, sig, oldset); spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c index 03abaf048f09..a0ed0e052b2e 100644 --- a/arch/mips/kernel/signal32.c +++ b/arch/mips/kernel/signal32.c @@ -32,6 +32,7 @@ #include <asm/system.h> #include <asm/fpu.h> #include <asm/war.h> +#include <asm/vdso.h> #include "signal-common.h" @@ -47,8 +48,6 @@ extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user /* * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... */ -#define __NR_O32_sigreturn 4119 -#define __NR_O32_rt_sigreturn 4193 #define __NR_O32_restart_syscall 4253 /* 32-bit compatibility types */ @@ -77,47 +76,20 @@ struct ucontext32 { compat_sigset_t uc_sigmask; /* mask last for extensibility */ }; -/* - * Horribly complicated - with the bloody RM9000 workarounds enabled - * the signal trampolines is moving to the end of the structure so we can - * increase the alignment without breaking software compatibility. - */ -#if ICACHE_REFILLS_WORKAROUND_WAR == 0 - struct sigframe32 { u32 sf_ass[4]; /* argument save space for o32 */ - u32 sf_code[2]; /* signal trampoline */ + u32 sf_pad[2]; /* Was: signal trampoline */ struct sigcontext32 sf_sc; compat_sigset_t sf_mask; }; struct rt_sigframe32 { u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_code[2]; /* signal trampoline */ + u32 rs_pad[2]; /* Was: signal trampoline */ compat_siginfo_t rs_info; struct ucontext32 rs_uc; }; -#else /* ICACHE_REFILLS_WORKAROUND_WAR */ - -struct sigframe32 { - u32 sf_ass[4]; /* argument save space for o32 */ - u32 sf_pad[2]; - struct sigcontext32 sf_sc; /* hw context */ - compat_sigset_t sf_mask; - u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ -}; - -struct rt_sigframe32 { - u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_pad[2]; - compat_siginfo_t rs_info; - struct ucontext32 rs_uc; - u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */ -}; - -#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ - /* * sigcontext handlers */ @@ -598,8 +570,8 @@ badframe: force_sig(SIGSEGV, current); } -static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, - int signr, sigset_t *set) +static int setup_frame_32(void *sig_return, struct k_sigaction *ka, + struct pt_regs *regs, int signr, sigset_t *set) { struct sigframe32 __user *frame; int err = 0; @@ -608,8 +580,6 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; - err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn); - err |= setup_sigcontext32(regs, &frame->sf_sc); err |= __copy_conv_sigset_to_user(&frame->sf_mask, set); @@ -630,7 +600,7 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, regs->regs[ 5] = 0; regs->regs[ 6] = (unsigned long) &frame->sf_sc; regs->regs[29] = (unsigned long) frame; - regs->regs[31] = (unsigned long) frame->sf_code; + regs->regs[31] = (unsigned long) sig_return; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", @@ -644,8 +614,9 @@ give_sigsegv: return -EFAULT; } -static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, - int signr, sigset_t *set, siginfo_t *info) +static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka, + struct pt_regs *regs, int signr, sigset_t *set, + siginfo_t *info) { struct rt_sigframe32 __user *frame; int err = 0; @@ -655,8 +626,6 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; - err |= install_sigtramp(frame->rs_code, __NR_O32_rt_sigreturn); - /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ err |= copy_siginfo_to_user32(&frame->rs_info, info); @@ -690,7 +659,7 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, regs->regs[ 5] = (unsigned long) &frame->rs_info; regs->regs[ 6] = (unsigned long) &frame->rs_uc; regs->regs[29] = (unsigned long) frame; - regs->regs[31] = (unsigned long) frame->rs_code; + regs->regs[31] = (unsigned long) sig_return; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", @@ -709,7 +678,11 @@ give_sigsegv: */ struct mips_abi mips_abi_32 = { .setup_frame = setup_frame_32, + .signal_return_offset = + offsetof(struct mips_vdso, o32_signal_trampoline), .setup_rt_frame = setup_rt_frame_32, + .rt_signal_return_offset = + offsetof(struct mips_vdso, o32_rt_signal_trampoline), .restart = __NR_O32_restart_syscall }; diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c index bb277e82d421..2c5df818c65a 100644 --- a/arch/mips/kernel/signal_n32.c +++ b/arch/mips/kernel/signal_n32.c @@ -39,13 +39,13 @@ #include <asm/fpu.h> #include <asm/cpu-features.h> #include <asm/war.h> +#include <asm/vdso.h> #include "signal-common.h" /* * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... */ -#define __NR_N32_rt_sigreturn 6211 #define __NR_N32_restart_syscall 6214 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); @@ -67,27 +67,13 @@ struct ucontextn32 { compat_sigset_t uc_sigmask; /* mask last for extensibility */ }; -#if ICACHE_REFILLS_WORKAROUND_WAR == 0 - -struct rt_sigframe_n32 { - u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_code[2]; /* signal trampoline */ - struct compat_siginfo rs_info; - struct ucontextn32 rs_uc; -}; - -#else /* ICACHE_REFILLS_WORKAROUND_WAR */ - struct rt_sigframe_n32 { u32 rs_ass[4]; /* argument save space for o32 */ - u32 rs_pad[2]; + u32 rs_pad[2]; /* Was: signal trampoline */ struct compat_siginfo rs_info; struct ucontextn32 rs_uc; - u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ }; -#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ - extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) @@ -173,7 +159,7 @@ badframe: force_sig(SIGSEGV, current); } -static int setup_rt_frame_n32(struct k_sigaction * ka, +static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) { struct rt_sigframe_n32 __user *frame; @@ -184,8 +170,6 @@ static int setup_rt_frame_n32(struct k_sigaction * ka, if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; - install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); - /* Create siginfo. */ err |= copy_siginfo_to_user32(&frame->rs_info, info); @@ -219,7 +203,7 @@ static int setup_rt_frame_n32(struct k_sigaction * ka, regs->regs[ 5] = (unsigned long) &frame->rs_info; regs->regs[ 6] = (unsigned long) &frame->rs_uc; regs->regs[29] = (unsigned long) frame; - regs->regs[31] = (unsigned long) frame->rs_code; + regs->regs[31] = (unsigned long) sig_return; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", @@ -235,5 +219,7 @@ give_sigsegv: struct mips_abi mips_abi_n32 = { .setup_rt_frame = setup_rt_frame_n32, + .rt_signal_return_offset = + offsetof(struct mips_vdso, n32_rt_signal_trampoline), .restart = __NR_N32_restart_syscall }; diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c index 25e825aea327..a95dea5459c4 100644 --- a/arch/mips/kernel/smtc.c +++ b/arch/mips/kernel/smtc.c @@ -182,7 +182,7 @@ static int vpemask[2][8] = { {0, 0, 0, 0, 0, 0, 0, 1} }; int tcnoprog[NR_CPUS]; -static atomic_t idle_hook_initialized = {0}; +static atomic_t idle_hook_initialized = ATOMIC_INIT(0); static int clock_hang_reported[NR_CPUS]; #endif /* CONFIG_SMTC_IDLE_HOOK_DEBUG */ diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 9587abc67f35..dd81b0f87518 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -79,7 +79,11 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, int do_color_align; unsigned long task_size; - task_size = STACK_TOP; +#ifdef CONFIG_32BIT + task_size = TASK_SIZE; +#else /* Must be CONFIG_64BIT*/ + task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE; +#endif if (len > task_size) return -ENOMEM; diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 4e00f9bc23ee..1a4dd657ccb9 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1599,7 +1599,7 @@ void __init trap_init(void) ebase = (unsigned long) __alloc_bootmem(size, 1 << fls(size), 0); } else { - ebase = CAC_BASE; + ebase = CKSEG0; if (cpu_has_mips_r2) ebase += (read_c0_ebase() & 0x3ffff000); } diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c new file mode 100644 index 000000000000..b773c1112b14 --- /dev/null +++ b/arch/mips/kernel/vdso.c @@ -0,0 +1,112 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2009, 2010 Cavium Networks, Inc. + */ + + +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/binfmts.h> +#include <linux/elf.h> +#include <linux/vmalloc.h> +#include <linux/unistd.h> + +#include <asm/vdso.h> +#include <asm/uasm.h> + +/* + * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... + */ +#define __NR_O32_sigreturn 4119 +#define __NR_O32_rt_sigreturn 4193 +#define __NR_N32_rt_sigreturn 6211 + +static struct page *vdso_page; + +static void __init install_trampoline(u32 *tramp, unsigned int sigreturn) +{ + uasm_i_addiu(&tramp, 2, 0, sigreturn); /* li v0, sigreturn */ + uasm_i_syscall(&tramp, 0); +} + +static int __init init_vdso(void) +{ + struct mips_vdso *vdso; + + vdso_page = alloc_page(GFP_KERNEL); + if (!vdso_page) + panic("Cannot allocate vdso"); + + vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL); + if (!vdso) + panic("Cannot map vdso"); + clear_page(vdso); + + install_trampoline(vdso->rt_signal_trampoline, __NR_rt_sigreturn); +#ifdef CONFIG_32BIT + install_trampoline(vdso->signal_trampoline, __NR_sigreturn); +#else + install_trampoline(vdso->n32_rt_signal_trampoline, + __NR_N32_rt_sigreturn); + install_trampoline(vdso->o32_signal_trampoline, __NR_O32_sigreturn); + install_trampoline(vdso->o32_rt_signal_trampoline, + __NR_O32_rt_sigreturn); +#endif + + vunmap(vdso); + + pr_notice("init_vdso successfull\n"); + + return 0; +} +device_initcall(init_vdso); + +static unsigned long vdso_addr(unsigned long start) +{ + return STACK_TOP; +} + +int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) +{ + int ret; + unsigned long addr; + struct mm_struct *mm = current->mm; + + down_write(&mm->mmap_sem); + + addr = vdso_addr(mm->start_stack); + + addr = get_unmapped_area(NULL, addr, PAGE_SIZE, 0, 0); + if (IS_ERR_VALUE(addr)) { + ret = addr; + goto up_fail; + } + + ret = install_special_mapping(mm, addr, PAGE_SIZE, + VM_READ|VM_EXEC| + VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| + VM_ALWAYSDUMP, + &vdso_page); + + if (ret) + goto up_fail; + + mm->context.vdso = (void *)addr; + +up_fail: + up_write(&mm->mmap_sem); + return ret; +} + +const char *arch_vma_name(struct vm_area_struct *vma) +{ + if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) + return "[vdso]"; + return NULL; +} |
