69be8f1896
It has been reported that the way Linux handles NODEFER for signals is not consistent with the way other Unix boxes handle it. I've written a program to test the behavior of how this flag affects signals and had several reports from people who ran this on various Unix boxes, confirming that Linux seems to be unique on the way this is handled. The way NODEFER affects signals on other Unix boxes is as follows: 1) If NODEFER is set, other signals in sa_mask are still blocked. 2) If NODEFER is set and the signal is in sa_mask, then the signal is still blocked. (Note: this is the behavior of all tested but Linux _and_ NetBSD 2.0 *). The way NODEFER affects signals on Linux: 1) If NODEFER is set, other signals are _not_ blocked regardless of sa_mask (Even NetBSD doesn't do this). 2) If NODEFER is set and the signal is in sa_mask, then the signal being handled is not blocked. The patch converts signal handling in all current Linux architectures to the way most Unix boxes work. Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU 3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX. * NetBSD was the only other Unix to behave like Linux on point #2. The main concern was brought up by point #1 which even NetBSD isn't like Linux. So with this patch, we leave NetBSD as the lonely one that behaves differently here with #2. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
905 lines
23 KiB
C
905 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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|
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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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|
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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;
|
|
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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}
|
|
}
|
|
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)))
|
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goto badframe;
|
|
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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|
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if (restore_sigcontext32(®s, &frame->sf_sc))
|
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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);
|
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
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;
|
|
}
|