906 lines
23 KiB
C
906 lines
23 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/compat.h>
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#include <linux/suspend.h>
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#include <linux/compiler.h>
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#include <asm/asm.h>
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#include <linux/bitops.h>
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#include <asm/cacheflush.h>
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#include <asm/sim.h>
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#include <asm/uaccess.h>
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#include <asm/ucontext.h>
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#include <asm/system.h>
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#include <asm/fpu.h>
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#define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3)
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typedef struct compat_siginfo {
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int si_signo;
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int si_code;
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int si_errno;
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union {
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int _pad[SI_PAD_SIZE32];
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/* kill() */
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struct {
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compat_pid_t _pid; /* sender's pid */
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compat_uid_t _uid; /* sender's uid */
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} _kill;
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/* SIGCHLD */
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struct {
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compat_pid_t _pid; /* which child */
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compat_uid_t _uid; /* sender's uid */
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int _status; /* exit code */
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compat_clock_t _utime;
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compat_clock_t _stime;
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} _sigchld;
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/* IRIX SIGCHLD */
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struct {
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compat_pid_t _pid; /* which child */
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compat_clock_t _utime;
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int _status; /* exit code */
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compat_clock_t _stime;
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} _irix_sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct {
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s32 _addr; /* faulting insn/memory ref. */
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} _sigfault;
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/* SIGPOLL, SIGXFSZ (To do ...) */
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struct {
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int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
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int _fd;
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} _sigpoll;
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/* POSIX.1b timers */
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struct {
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unsigned int _timer1;
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unsigned int _timer2;
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} _timer;
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/* POSIX.1b signals */
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struct {
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compat_pid_t _pid; /* sender's pid */
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compat_uid_t _uid; /* sender's uid */
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compat_sigval_t _sigval;
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} _rt;
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} _sifields;
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} compat_siginfo_t;
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/*
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* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
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*/
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#define __NR_O32_sigreturn 4119
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#define __NR_O32_rt_sigreturn 4193
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#define __NR_O32_restart_syscall 4253
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
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/* 32-bit compatibility types */
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#define _NSIG_BPW32 32
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#define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32)
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typedef struct {
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unsigned int sig[_NSIG_WORDS32];
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} sigset_t32;
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typedef unsigned int __sighandler32_t;
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typedef void (*vfptr_t)(void);
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struct sigaction32 {
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unsigned int sa_flags;
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__sighandler32_t sa_handler;
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compat_sigset_t sa_mask;
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};
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/* IRIX compatible stack_t */
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typedef struct sigaltstack32 {
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s32 ss_sp;
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compat_size_t ss_size;
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int ss_flags;
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} stack32_t;
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struct ucontext32 {
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u32 uc_flags;
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s32 uc_link;
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stack32_t uc_stack;
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struct sigcontext32 uc_mcontext;
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sigset_t32 uc_sigmask; /* mask last for extensibility */
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};
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extern void __put_sigset_unknown_nsig(void);
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extern void __get_sigset_unknown_nsig(void);
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static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf)
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{
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int err = 0;
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
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return -EFAULT;
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switch (_NSIG_WORDS) {
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default:
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__put_sigset_unknown_nsig();
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case 2:
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err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]);
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err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
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case 1:
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err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]);
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err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
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}
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return err;
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}
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static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf)
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{
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int err = 0;
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unsigned long sig[4];
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if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
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return -EFAULT;
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switch (_NSIG_WORDS) {
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default:
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__get_sigset_unknown_nsig();
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case 2:
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err |= __get_user (sig[3], &ubuf->sig[3]);
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err |= __get_user (sig[2], &ubuf->sig[2]);
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kbuf->sig[1] = sig[2] | (sig[3] << 32);
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case 1:
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err |= __get_user (sig[1], &ubuf->sig[1]);
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err |= __get_user (sig[0], &ubuf->sig[0]);
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kbuf->sig[0] = sig[0] | (sig[1] << 32);
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}
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return err;
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}
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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save_static_function(sys32_sigsuspend);
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__attribute_used__ noinline static int
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_sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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compat_sigset_t *uset;
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sigset_t newset, saveset;
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uset = (compat_sigset_t *) regs.regs[4];
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if (get_sigset(&newset, uset))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs.regs[2] = EINTR;
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regs.regs[7] = 1;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal32(&saveset, ®s))
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return -EINTR;
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}
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}
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save_static_function(sys32_rt_sigsuspend);
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__attribute_used__ noinline static int
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_sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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compat_sigset_t *uset;
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sigset_t newset, saveset;
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size_t sigsetsize;
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/* XXX Don't preclude handling different sized sigset_t's. */
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sigsetsize = regs.regs[5];
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if (sigsetsize != sizeof(compat_sigset_t))
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return -EINVAL;
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uset = (compat_sigset_t *) regs.regs[4];
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if (get_sigset(&newset, uset))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs.regs[2] = EINTR;
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regs.regs[7] = 1;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal32(&saveset, ®s))
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return -EINTR;
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}
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}
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asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act,
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struct sigaction32 *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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int err = 0;
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if (act) {
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old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)))
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return -EFAULT;
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err |= __get_user((u32)(u64)new_ka.sa.sa_handler,
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&act->sa_handler);
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err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
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err |= __get_user(mask, &act->sa_mask.sig[0]);
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if (err)
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return -EFAULT;
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
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return -EFAULT;
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err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
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&oact->sa_handler);
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err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
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err |= __put_user(0, &oact->sa_mask.sig[1]);
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err |= __put_user(0, &oact->sa_mask.sig[2]);
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err |= __put_user(0, &oact->sa_mask.sig[3]);
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if (err)
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return -EFAULT;
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}
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return ret;
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}
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asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
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{
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const stack32_t *uss = (const stack32_t *) regs.regs[4];
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stack32_t *uoss = (stack32_t *) regs.regs[5];
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unsigned long usp = regs.regs[29];
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stack_t kss, koss;
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int ret, err = 0;
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mm_segment_t old_fs = get_fs();
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s32 sp;
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if (uss) {
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if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
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return -EFAULT;
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err |= __get_user(sp, &uss->ss_sp);
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kss.ss_sp = (void *) (long) sp;
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err |= __get_user(kss.ss_size, &uss->ss_size);
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err |= __get_user(kss.ss_flags, &uss->ss_flags);
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if (err)
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return -EFAULT;
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}
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set_fs (KERNEL_DS);
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ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp);
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set_fs (old_fs);
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if (!ret && uoss) {
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if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
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return -EFAULT;
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sp = (int) (long) koss.ss_sp;
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err |= __put_user(sp, &uoss->ss_sp);
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err |= __put_user(koss.ss_size, &uoss->ss_size);
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err |= __put_user(koss.ss_flags, &uoss->ss_flags);
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if (err)
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return -EFAULT;
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}
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return ret;
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}
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static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
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{
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int err = 0;
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__u32 used_math;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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err |= __get_user(regs->cp0_epc, &sc->sc_pc);
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err |= __get_user(regs->hi, &sc->sc_mdhi);
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err |= __get_user(regs->lo, &sc->sc_mdlo);
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#define restore_gp_reg(i) do { \
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err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
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} while(0)
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restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
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restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
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restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
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restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
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restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
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restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
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restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
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restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
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restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
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restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
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restore_gp_reg(31);
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#undef restore_gp_reg
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err |= __get_user(used_math, &sc->sc_used_math);
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conditional_used_math(used_math);
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preempt_disable();
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if (used_math()) {
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/* restore fpu context if we have used it before */
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own_fpu();
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err |= restore_fp_context32(sc);
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} else {
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/* signal handler may have used FPU. Give it up. */
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lose_fpu();
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}
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preempt_enable();
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return err;
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}
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struct sigframe {
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u32 sf_ass[4]; /* argument save space for o32 */
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u32 sf_code[2]; /* signal trampoline */
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struct sigcontext32 sf_sc;
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sigset_t sf_mask;
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};
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struct rt_sigframe32 {
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u32 rs_ass[4]; /* argument save space for o32 */
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u32 rs_code[2]; /* signal trampoline */
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compat_siginfo_t rs_info;
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struct ucontext32 rs_uc;
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};
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int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from)
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{
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int err;
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if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member.
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This routine must convert siginfo from 64bit to 32bit as well
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at the same time. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (from->si_code >> 16) {
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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default:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_FAULT >> 16:
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err |= __put_user((long)from->si_addr, &to->si_addr);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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}
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}
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return err;
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}
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save_static_function(sys32_sigreturn);
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__attribute_used__ noinline static void
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_sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct sigframe *frame;
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sigset_t blocked;
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frame = (struct sigframe *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
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goto badframe;
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sigdelsetmask(&blocked, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = blocked;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigcontext32(®s, &frame->sf_sc))
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goto badframe;
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/*
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* Don't let your children do this ...
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*/
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if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
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do_syscall_trace(®s, 1);
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV, current);
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}
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save_static_function(sys32_rt_sigreturn);
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__attribute_used__ noinline static void
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_sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct rt_sigframe32 *frame;
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sigset_t set;
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stack_t st;
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s32 sp;
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frame = (struct rt_sigframe32 *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
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goto badframe;
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|
|
|
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())
|
|
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;
|
|
}
|