diff options
Diffstat (limited to 'arch/mips/kernel/signal32.c')
| -rw-r--r-- | arch/mips/kernel/signal32.c | 905 |
1 files changed, 905 insertions, 0 deletions
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c new file mode 100644 index 000000000000..1f3b19124c01 --- /dev/null +++ b/arch/mips/kernel/signal32.c @@ -0,0 +1,905 @@ +/* + * 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) 1991, 1992 Linus Torvalds + * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + */ +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/syscalls.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/compat.h> +#include <linux/suspend.h> +#include <linux/compiler.h> + +#include <asm/asm.h> +#include <linux/bitops.h> +#include <asm/cacheflush.h> +#include <asm/sim.h> +#include <asm/uaccess.h> +#include <asm/ucontext.h> +#include <asm/system.h> +#include <asm/fpu.h> + +#define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) + +typedef struct compat_siginfo { + int si_signo; + int si_code; + int si_errno; + + union { + int _pad[SI_PAD_SIZE32]; + + /* kill() */ + struct { + compat_pid_t _pid; /* sender's pid */ + compat_uid_t _uid; /* sender's uid */ + } _kill; + + /* SIGCHLD */ + struct { + compat_pid_t _pid; /* which child */ + compat_uid_t _uid; /* sender's uid */ + int _status; /* exit code */ + compat_clock_t _utime; + compat_clock_t _stime; + } _sigchld; + + /* IRIX SIGCHLD */ + struct { + compat_pid_t _pid; /* which child */ + compat_clock_t _utime; + int _status; /* exit code */ + compat_clock_t _stime; + } _irix_sigchld; + + /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ + struct { + s32 _addr; /* faulting insn/memory ref. */ + } _sigfault; + + /* SIGPOLL, SIGXFSZ (To do ...) */ + struct { + int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ + int _fd; + } _sigpoll; + + /* POSIX.1b timers */ + struct { + unsigned int _timer1; + unsigned int _timer2; + } _timer; + + /* POSIX.1b signals */ + struct { + compat_pid_t _pid; /* sender's pid */ + compat_uid_t _uid; /* sender's uid */ + compat_sigval_t _sigval; + } _rt; + + } _sifields; +} compat_siginfo_t; + +/* + * 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 + +#define DEBUG_SIG 0 + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +extern int do_signal32(sigset_t *oldset, struct pt_regs *regs); + +/* 32-bit compatibility types */ + +#define _NSIG_BPW32 32 +#define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32) + +typedef struct { + unsigned int sig[_NSIG_WORDS32]; +} sigset_t32; + +typedef unsigned int __sighandler32_t; +typedef void (*vfptr_t)(void); + +struct sigaction32 { + unsigned int sa_flags; + __sighandler32_t sa_handler; + compat_sigset_t sa_mask; +}; + +/* IRIX compatible stack_t */ +typedef struct sigaltstack32 { + s32 ss_sp; + compat_size_t ss_size; + int ss_flags; +} stack32_t; + +struct ucontext32 { + u32 uc_flags; + s32 uc_link; + stack32_t uc_stack; + struct sigcontext32 uc_mcontext; + sigset_t32 uc_sigmask; /* mask last for extensibility */ +}; + +extern void __put_sigset_unknown_nsig(void); +extern void __get_sigset_unknown_nsig(void); + +static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf) +{ + int err = 0; + + if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) + return -EFAULT; + + switch (_NSIG_WORDS) { + default: + __put_sigset_unknown_nsig(); + case 2: + err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]); + err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); + case 1: + err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]); + err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); + } + + return err; +} + +static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf) +{ + int err = 0; + unsigned long sig[4]; + + if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) + return -EFAULT; + + switch (_NSIG_WORDS) { + default: + __get_sigset_unknown_nsig(); + case 2: + err |= __get_user (sig[3], &ubuf->sig[3]); + err |= __get_user (sig[2], &ubuf->sig[2]); + kbuf->sig[1] = sig[2] | (sig[3] << 32); + case 1: + err |= __get_user (sig[1], &ubuf->sig[1]); + err |= __get_user (sig[0], &ubuf->sig[0]); + kbuf->sig[0] = sig[0] | (sig[1] << 32); + } + + return err; +} + +/* + * Atomically swap in the new signal mask, and wait for a signal. + */ + +save_static_function(sys32_sigsuspend); +__attribute_used__ noinline static int +_sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) +{ + compat_sigset_t *uset; + sigset_t newset, saveset; + + uset = (compat_sigset_t *) regs.regs[4]; + if (get_sigset(&newset, uset)) + return -EFAULT; + sigdelsetmask(&newset, ~_BLOCKABLE); + + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + current->blocked = newset; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs.regs[2] = EINTR; + regs.regs[7] = 1; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal32(&saveset, ®s)) + return -EINTR; + } +} + +save_static_function(sys32_rt_sigsuspend); +__attribute_used__ noinline static int +_sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) +{ + compat_sigset_t *uset; + sigset_t newset, saveset; + size_t sigsetsize; + + /* XXX Don't preclude handling different sized sigset_t's. */ + sigsetsize = regs.regs[5]; + if (sigsetsize != sizeof(compat_sigset_t)) + return -EINVAL; + + uset = (compat_sigset_t *) regs.regs[4]; + if (get_sigset(&newset, uset)) + return -EFAULT; + sigdelsetmask(&newset, ~_BLOCKABLE); + + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + current->blocked = newset; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs.regs[2] = EINTR; + regs.regs[7] = 1; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal32(&saveset, ®s)) + return -EINTR; + } +} + +asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act, + struct sigaction32 *oact) +{ + struct k_sigaction new_ka, old_ka; + int ret; + int err = 0; + + if (act) { + old_sigset_t mask; + + if (!access_ok(VERIFY_READ, act, sizeof(*act))) + return -EFAULT; + err |= __get_user((u32)(u64)new_ka.sa.sa_handler, + &act->sa_handler); + err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); + err |= __get_user(mask, &act->sa_mask.sig[0]); + if (err) + return -EFAULT; + + siginitset(&new_ka.sa.sa_mask, mask); + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + + if (!ret && oact) { + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) + return -EFAULT; + err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); + err |= __put_user((u32)(u64)old_ka.sa.sa_handler, + &oact->sa_handler); + err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); + err |= __put_user(0, &oact->sa_mask.sig[1]); + err |= __put_user(0, &oact->sa_mask.sig[2]); + err |= __put_user(0, &oact->sa_mask.sig[3]); + if (err) + return -EFAULT; + } + + return ret; +} + +asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs) +{ + const stack32_t *uss = (const stack32_t *) regs.regs[4]; + stack32_t *uoss = (stack32_t *) regs.regs[5]; + unsigned long usp = regs.regs[29]; + stack_t kss, koss; + int ret, err = 0; + mm_segment_t old_fs = get_fs(); + s32 sp; + + if (uss) { + if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) + return -EFAULT; + err |= __get_user(sp, &uss->ss_sp); + kss.ss_sp = (void *) (long) sp; + err |= __get_user(kss.ss_size, &uss->ss_size); + err |= __get_user(kss.ss_flags, &uss->ss_flags); + if (err) + return -EFAULT; + } + + set_fs (KERNEL_DS); + ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp); + set_fs (old_fs); + + if (!ret && uoss) { + if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) + return -EFAULT; + sp = (int) (long) koss.ss_sp; + err |= __put_user(sp, &uoss->ss_sp); + err |= __put_user(koss.ss_size, &uoss->ss_size); + err |= __put_user(koss.ss_flags, &uoss->ss_flags); + if (err) + return -EFAULT; + } + return ret; +} + +static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc) +{ + int err = 0; + __u32 used_math; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + err |= __get_user(regs->cp0_epc, &sc->sc_pc); + err |= __get_user(regs->hi, &sc->sc_mdhi); + err |= __get_user(regs->lo, &sc->sc_mdlo); + +#define restore_gp_reg(i) do { \ + err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); + restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); + restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); + restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); + restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); + restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); + restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); + restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); + restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); + restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); + restore_gp_reg(31); +#undef restore_gp_reg + + err |= __get_user(used_math, &sc->sc_used_math); + conditional_used_math(used_math); + + preempt_disable(); + + if (used_math()) { + /* restore fpu context if we have used it before */ + own_fpu(); + err |= restore_fp_context32(sc); + } else { + /* signal handler may have used FPU. Give it up. */ + lose_fpu(); + } + + preempt_enable(); + + return err; +} + +struct sigframe { + u32 sf_ass[4]; /* argument save space for o32 */ + u32 sf_code[2]; /* signal trampoline */ + struct sigcontext32 sf_sc; + sigset_t sf_mask; +}; + +struct rt_sigframe32 { + u32 rs_ass[4]; /* argument save space for o32 */ + u32 rs_code[2]; /* signal trampoline */ + compat_siginfo_t rs_info; + struct ucontext32 rs_uc; +}; + +int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from) +{ + int err; + + if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) + return -EFAULT; + + /* If you change siginfo_t structure, please be sure + this code is fixed accordingly. + It should never copy any pad contained in the structure + to avoid security leaks, but must copy the generic + 3 ints plus the relevant union member. + This routine must convert siginfo from 64bit to 32bit as well + at the same time. */ + err = __put_user(from->si_signo, &to->si_signo); + err |= __put_user(from->si_errno, &to->si_errno); + err |= __put_user((short)from->si_code, &to->si_code); + if (from->si_code < 0) + err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); + else { + switch (from->si_code >> 16) { + case __SI_CHLD >> 16: + err |= __put_user(from->si_utime, &to->si_utime); + err |= __put_user(from->si_stime, &to->si_stime); + err |= __put_user(from->si_status, &to->si_status); + default: + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + break; + case __SI_FAULT >> 16: + err |= __put_user((long)from->si_addr, &to->si_addr); + break; + case __SI_POLL >> 16: + err |= __put_user(from->si_band, &to->si_band); + err |= __put_user(from->si_fd, &to->si_fd); + break; + case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ + case __SI_MESGQ >> 16: + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + err |= __put_user(from->si_int, &to->si_int); + break; + } + } + return err; +} + +save_static_function(sys32_sigreturn); +__attribute_used__ noinline static void +_sys32_sigreturn(nabi_no_regargs struct pt_regs regs) +{ + struct sigframe *frame; + sigset_t blocked; + + frame = (struct sigframe *) regs.regs[29]; + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) + goto badframe; + + sigdelsetmask(&blocked, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = blocked; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext32(®s, &frame->sf_sc)) + goto badframe; + + /* + * Don't let your children do this ... + */ + if (current_thread_info()->flags & TIF_SYSCALL_TRACE) + do_syscall_trace(®s, 1); + __asm__ __volatile__( + "move\t$29, %0\n\t" + "j\tsyscall_exit" + :/* no outputs */ + :"r" (®s)); + /* Unreached */ + +badframe: + force_sig(SIGSEGV, current); +} + +save_static_function(sys32_rt_sigreturn); +__attribute_used__ noinline static void +_sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) +{ + struct rt_sigframe32 *frame; + sigset_t set; + stack_t st; + s32 sp; + + frame = (struct rt_sigframe32 *) regs.regs[29]; + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext)) + goto badframe; + + /* The ucontext contains a stack32_t, so we must convert! */ + if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) + goto badframe; + st.ss_size = (long) sp; + if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) + goto badframe; + if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) + goto badframe; + + /* It is more difficult to avoid calling this function than to + call it and ignore errors. */ + do_sigaltstack(&st, NULL, regs.regs[29]); + + /* + * Don't let your children do this ... + */ + __asm__ __volatile__( + "move\t$29, %0\n\t" + "j\tsyscall_exit" + :/* no outputs */ + :"r" (®s)); + /* Unreached */ + +badframe: + force_sig(SIGSEGV, current); +} + +static inline int setup_sigcontext32(struct pt_regs *regs, + struct sigcontext32 *sc) +{ + int err = 0; + + err |= __put_user(regs->cp0_epc, &sc->sc_pc); + err |= __put_user(regs->cp0_status, &sc->sc_status); + +#define save_gp_reg(i) { \ + err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); + save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); + save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); + save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); + save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); + save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); + save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); + save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); + save_gp_reg(31); +#undef save_gp_reg + + err |= __put_user(regs->hi, &sc->sc_mdhi); + err |= __put_user(regs->lo, &sc->sc_mdlo); + err |= __put_user(regs->cp0_cause, &sc->sc_cause); + err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr); + + err |= __put_user(!!used_math(), &sc->sc_used_math); + + if (!used_math()) + goto out; + + /* + * Save FPU state to signal context. Signal handler will "inherit" + * current FPU state. + */ + preempt_disable(); + + if (!is_fpu_owner()) { + own_fpu(); + restore_fp(current); + } + err |= save_fp_context32(sc); + + preempt_enable(); + +out: + return err; +} + +/* + * Determine which stack to use.. + */ +static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, + size_t frame_size) +{ + unsigned long sp; + + /* Default to using normal stack */ + sp = regs->regs[29]; + + /* + * FPU emulator may have it's own trampoline active just + * above the user stack, 16-bytes before the next lowest + * 16 byte boundary. Try to avoid trashing it. + */ + sp -= 32; + + /* This is the X/Open sanctioned signal stack switching. */ + if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) + sp = current->sas_ss_sp + current->sas_ss_size; + + return (void *)((sp - frame_size) & ALMASK); +} + +static inline void setup_frame(struct k_sigaction * ka, struct pt_regs *regs, + int signr, sigset_t *set) +{ + struct sigframe *frame; + int err = 0; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) + goto give_sigsegv; + + /* + * Set up the return code ... + * + * li v0, __NR_O32_sigreturn + * syscall + */ + err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0); + err |= __put_user(0x0000000c , frame->sf_code + 1); + flush_cache_sigtramp((unsigned long) frame->sf_code); + + err |= setup_sigcontext32(regs, &frame->sf_sc); + err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); + if (err) + goto give_sigsegv; + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = 0 (should be cause) + * a2 = pointer to struct sigcontext + * + * $25 and c0_epc point to the signal handler, $29 points to the + * struct sigframe. + */ + regs->regs[ 4] = signr; + 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->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", + current->comm, current->pid, + frame, regs->cp0_epc, frame->sf_code); +#endif + return; + +give_sigsegv: + force_sigsegv(signr, current); +} + +static inline void setup_rt_frame(struct k_sigaction * ka, + struct pt_regs *regs, int signr, + sigset_t *set, siginfo_t *info) +{ + struct rt_sigframe32 *frame; + int err = 0; + s32 sp; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) + goto give_sigsegv; + + /* Set up to return from userspace. If provided, use a stub already + in userspace. */ + /* + * Set up the return code ... + * + * li v0, __NR_O32_rt_sigreturn + * syscall + */ + err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0); + err |= __put_user(0x0000000c , frame->rs_code + 1); + flush_cache_sigtramp((unsigned long) frame->rs_code); + + /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ + err |= copy_siginfo_to_user32(&frame->rs_info, info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->rs_uc.uc_flags); + err |= __put_user(0, &frame->rs_uc.uc_link); + sp = (int) (long) current->sas_ss_sp; + err |= __put_user(sp, + &frame->rs_uc.uc_stack.ss_sp); + err |= __put_user(sas_ss_flags(regs->regs[29]), + &frame->rs_uc.uc_stack.ss_flags); + err |= __put_user(current->sas_ss_size, + &frame->rs_uc.uc_stack.ss_size); + err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); + err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); + + if (err) + goto give_sigsegv; + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = 0 (should be cause) + * a2 = pointer to ucontext + * + * $25 and c0_epc point to the signal handler, $29 points to + * the struct rt_sigframe32. + */ + regs->regs[ 4] = signr; + 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->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", + current->comm, current->pid, + frame, regs->cp0_epc, frame->rs_code); +#endif + return; + +give_sigsegv: + force_sigsegv(signr, current); +} + +static inline void handle_signal(unsigned long sig, siginfo_t *info, + struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs) +{ + switch (regs->regs[0]) { + case ERESTART_RESTARTBLOCK: + case ERESTARTNOHAND: + regs->regs[2] = EINTR; + break; + case ERESTARTSYS: + if(!(ka->sa.sa_flags & SA_RESTART)) { + regs->regs[2] = EINTR; + break; + } + /* fallthrough */ + case ERESTARTNOINTR: /* Userland will reload $v0. */ + regs->regs[7] = regs->regs[26]; + regs->cp0_epc -= 8; + } + + regs->regs[0] = 0; /* Don't deal with this again. */ + + if (ka->sa.sa_flags & SA_SIGINFO) + setup_rt_frame(ka, regs, sig, oldset, info); + else + setup_frame(ka, regs, sig, oldset); + + if (!(ka->sa.sa_flags & SA_NODEFER)) { + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + sigaddset(¤t->blocked,sig); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + } +} + +int do_signal32(sigset_t *oldset, struct pt_regs *regs) +{ + struct k_sigaction ka; + siginfo_t info; + int signr; + + /* + * We want the common case to go fast, which is why we may in certain + * cases get here from kernel mode. Just return without doing anything + * if so. + */ + if (!user_mode(regs)) + return 1; + + if (try_to_freeze(0)) + goto no_signal; + + if (!oldset) + oldset = ¤t->blocked; + + signr = get_signal_to_deliver(&info, &ka, regs, NULL); + if (signr > 0) { + handle_signal(signr, &info, &ka, oldset, regs); + return 1; + } + +no_signal: + /* + * Who's code doesn't conform to the restartable syscall convention + * dies here!!! The li instruction, a single machine instruction, + * must directly be followed by the syscall instruction. + */ + if (regs->regs[0]) { + if (regs->regs[2] == ERESTARTNOHAND || + regs->regs[2] == ERESTARTSYS || + regs->regs[2] == ERESTARTNOINTR) { + regs->regs[7] = regs->regs[26]; + regs->cp0_epc -= 8; + } + if (regs->regs[2] == ERESTART_RESTARTBLOCK) { + regs->regs[2] = __NR_O32_restart_syscall; + regs->regs[7] = regs->regs[26]; + regs->cp0_epc -= 4; + } + } + return 0; +} + +asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act, + struct sigaction32 *oact, + unsigned int sigsetsize) +{ + struct k_sigaction new_sa, old_sa; + int ret = -EINVAL; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(sigset_t)) + goto out; + + if (act) { + int err = 0; + + if (!access_ok(VERIFY_READ, act, sizeof(*act))) + return -EFAULT; + err |= __get_user((u32)(u64)new_sa.sa.sa_handler, + &act->sa_handler); + err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); + err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); + if (err) + return -EFAULT; + } + + ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); + + if (!ret && oact) { + int err = 0; + + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) + return -EFAULT; + + err |= __put_user((u32)(u64)old_sa.sa.sa_handler, + &oact->sa_handler); + err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); + err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); + if (err) + return -EFAULT; + } +out: + return ret; +} + +asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t *set, + compat_sigset_t *oset, unsigned int sigsetsize) +{ + sigset_t old_set, new_set; + int ret; + mm_segment_t old_fs = get_fs(); + + if (set && get_sigset(&new_set, set)) + return -EFAULT; + + set_fs (KERNEL_DS); + ret = sys_rt_sigprocmask(how, set ? &new_set : NULL, + oset ? &old_set : NULL, sigsetsize); + set_fs (old_fs); + + if (!ret && oset && put_sigset(&old_set, oset)) + return -EFAULT; + + return ret; +} + +asmlinkage int sys32_rt_sigpending(compat_sigset_t *uset, + unsigned int sigsetsize) +{ + int ret; + sigset_t set; + mm_segment_t old_fs = get_fs(); + + set_fs (KERNEL_DS); + ret = sys_rt_sigpending(&set, sigsetsize); + set_fs (old_fs); + + if (!ret && put_sigset(&set, uset)) + return -EFAULT; + + return ret; +} + +asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t *uinfo) +{ + siginfo_t info; + int ret; + mm_segment_t old_fs = get_fs(); + + if (copy_from_user (&info, uinfo, 3*sizeof(int)) || + copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) + return -EFAULT; + set_fs (KERNEL_DS); + ret = sys_rt_sigqueueinfo(pid, sig, &info); + set_fs (old_fs); + return ret; +} |
