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/*
* IA32 Architecture-specific signal handling support.
*
* Copyright (C) 1999, 2001 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
* Copyright (C) 2000 VA Linux Co
* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
*
* Derived from i386 and Alpha versions.
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/wait.h>
#include <asm/uaccess.h>
#include <asm/rse.h>
#include <asm/sigcontext.h>
#include <asm/segment.h>
#include <asm/ia32.h>
#include "../kernel/sigframe.h"
#define A(__x) ((unsigned long)(__x))
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
#define __IA32_NR_sigreturn 119
#define __IA32_NR_rt_sigreturn 173
struct sigframe_ia32
{
int pretcode;
int sig;
struct sigcontext_ia32 sc;
struct _fpstate_ia32 fpstate;
unsigned int extramask[_IA32_NSIG_WORDS-1];
char retcode[8];
};
struct rt_sigframe_ia32
{
int pretcode;
int sig;
int pinfo;
int puc;
siginfo_t32 info;
struct ucontext_ia32 uc;
struct _fpstate_ia32 fpstate;
char retcode[8];
};
int
copy_siginfo_from_user32 (siginfo_t *to, siginfo_t32 *from)
{
unsigned long tmp;
int err;
if (!access_ok(VERIFY_READ, from, sizeof(siginfo_t32)))
return -EFAULT;
err = __get_user(to->si_signo, &from->si_signo);
err |= __get_user(to->si_errno, &from->si_errno);
err |= __get_user(to->si_code, &from->si_code);
if (from->si_code < 0)
err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (from->si_code >> 16) {
case __SI_CHLD >> 16:
err |= __get_user(to->si_utime, &from->si_utime);
err |= __get_user(to->si_stime, &from->si_stime);
err |= __get_user(to->si_status, &from->si_status);
default:
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
break;
case __SI_FAULT >> 16:
err |= __get_user(tmp, &from->si_addr);
to->si_addr = (void *) tmp;
break;
case __SI_POLL >> 16:
err |= __get_user(to->si_band, &from->si_band);
err |= __get_user(to->si_fd, &from->si_fd);
break;
/* case __SI_RT: This is not generated by the kernel as of now. */
}
}
return err;
}
int
copy_siginfo_to_user32 (siginfo_t32 *to, siginfo_t *from)
{
int err;
if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t32)))
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: This is not generated by the kernel as of now. */
}
}
return err;
}
static inline void
sigact_set_handler (struct k_sigaction *sa, unsigned int handler, unsigned int restorer)
{
if (handler + 1 <= 2)
/* SIG_DFL, SIG_IGN, or SIG_ERR: must sign-extend to 64-bits */
sa->sa.sa_handler = (__sighandler_t) A((int) handler);
else
sa->sa.sa_handler = (__sighandler_t) (((unsigned long) restorer << 32) | handler);
}
asmlinkage long
ia32_rt_sigsuspend (sigset32_t *uset, unsigned int sigsetsize, struct sigscratch *scr)
{
extern long ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall);
sigset_t oldset, set;
scr->scratch_unat = 0; /* avoid leaking kernel bits to user level */
memset(&set, 0, sizeof(&set));
if (sigsetsize > sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&set.sig, &uset->sig, sigsetsize))
return -EFAULT;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sigmask_lock);
{
oldset = current->blocked;
current->blocked = set;
recalc_sigpending(current);
}
spin_unlock_irq(¤t->sigmask_lock);
/*
* The return below usually returns to the signal handler. We need to pre-set the
* correct error code here to ensure that the right values get saved in sigcontext
* by ia64_do_signal.
*/
scr->pt.r8 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (ia64_do_signal(&oldset, scr, 1))
return -EINTR;
}
}
asmlinkage long
ia32_sigsuspend (unsigned int mask, struct sigscratch *scr)
{
return ia32_rt_sigsuspend((sigset32_t *)&mask, sizeof(mask), scr);
}
asmlinkage long
sys32_signal (int sig, unsigned int handler)
{
struct k_sigaction new_sa, old_sa;
int ret;
sigact_set_handler(&new_sa, handler, 0);
new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
ret = do_sigaction(sig, &new_sa, &old_sa);
return ret ? ret : IA32_SA_HANDLER(&old_sa);
}
asmlinkage long
sys32_rt_sigaction (int sig, struct sigaction32 *act,
struct sigaction32 *oact, unsigned int sigsetsize)
{
struct k_sigaction new_ka, old_ka;
unsigned int handler, restorer;
int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset32_t))
return -EINVAL;
if (act) {
ret = get_user(handler, &act->sa_handler);
ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
ret |= get_user(restorer, &act->sa_restorer);
ret |= copy_from_user(&new_ka.sa.sa_mask, &act->sa_mask, sizeof(sigset32_t));
if (ret)
return -EFAULT;
sigact_set_handler(&new_ka, handler, restorer);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
ret |= copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask, sizeof(sigset32_t));
}
return ret;
}
extern asmlinkage long sys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset,
size_t sigsetsize);
asmlinkage long
sys32_rt_sigprocmask (int how, sigset32_t *set, sigset32_t *oset, unsigned int sigsetsize)
{
mm_segment_t old_fs = get_fs();
sigset_t s;
long ret;
if (sigsetsize > sizeof(s))
return -EINVAL;
if (set) {
memset(&s, 0, sizeof(s));
if (copy_from_user(&s.sig, set, sigsetsize))
return -EFAULT;
}
set_fs(KERNEL_DS);
ret = sys_rt_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL, sizeof(s));
set_fs(old_fs);
if (ret)
return ret;
if (oset) {
if (copy_to_user(oset, &s.sig, sigsetsize))
return -EFAULT;
}
return 0;
}
asmlinkage long
sys32_sigprocmask (int how, unsigned int *set, unsigned int *oset)
{
return sys32_rt_sigprocmask(how, (sigset32_t *) set, (sigset32_t *) oset, sizeof(*set));
}
asmlinkage long
sys32_rt_sigtimedwait (sigset32_t *uthese, siginfo_t32 *uinfo, struct timespec32 *uts,
unsigned int sigsetsize)
{
extern asmlinkage long sys_rt_sigtimedwait (const sigset_t *, siginfo_t *,
const struct timespec *, size_t);
extern int copy_siginfo_to_user32 (siginfo_t32 *, siginfo_t *);
mm_segment_t old_fs = get_fs();
struct timespec t;
siginfo_t info;
sigset_t s;
int ret;
if (copy_from_user(&s.sig, uthese, sizeof(sigset32_t)))
return -EFAULT;
if (uts) {
ret = get_user(t.tv_sec, &uts->tv_sec);
ret |= get_user(t.tv_nsec, &uts->tv_nsec);
if (ret)
return -EFAULT;
}
set_fs(KERNEL_DS);
ret = sys_rt_sigtimedwait(&s, &info, &t, sigsetsize);
set_fs(old_fs);
if (ret >= 0 && uinfo) {
if (copy_siginfo_to_user32(uinfo, &info))
return -EFAULT;
}
return ret;
}
asmlinkage long
sys32_rt_sigqueueinfo (int pid, int sig, siginfo_t32 *uinfo)
{
extern asmlinkage long sys_rt_sigqueueinfo (int, int, siginfo_t *);
extern int copy_siginfo_from_user32 (siginfo_t *to, siginfo_t32 *from);
mm_segment_t old_fs = get_fs();
siginfo_t info;
int ret;
if (copy_siginfo_from_user32(&info, uinfo))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_rt_sigqueueinfo(pid, sig, &info);
set_fs(old_fs);
return ret;
}
asmlinkage long
sys32_sigaction (int sig, struct old_sigaction32 *act, struct old_sigaction32 *oact)
{
struct k_sigaction new_ka, old_ka;
unsigned int handler, restorer;
int ret;
if (act) {
old_sigset32_t mask;
ret = get_user(handler, &act->sa_handler);
ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
ret |= get_user(restorer, &act->sa_restorer);
ret |= get_user(mask, &act->sa_mask);
if (ret)
return ret;
sigact_set_handler(&new_ka, handler, restorer);
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
ret |= put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
}
static int
setup_sigcontext_ia32 (struct sigcontext_ia32 *sc, struct _fpstate_ia32 *fpstate,
struct pt_regs *regs, unsigned long mask)
{
int err = 0;
unsigned long flag;
err |= __put_user((regs->r16 >> 32) & 0xffff, (unsigned int *)&sc->fs);
err |= __put_user((regs->r16 >> 48) & 0xffff, (unsigned int *)&sc->gs);
err |= __put_user((regs->r16 >> 16) & 0xffff, (unsigned int *)&sc->es);
err |= __put_user(regs->r16 & 0xffff, (unsigned int *)&sc->ds);
err |= __put_user(regs->r15, &sc->edi);
err |= __put_user(regs->r14, &sc->esi);
err |= __put_user(regs->r13, &sc->ebp);
err |= __put_user(regs->r12, &sc->esp);
err |= __put_user(regs->r11, &sc->ebx);
err |= __put_user(regs->r10, &sc->edx);
err |= __put_user(regs->r9, &sc->ecx);
err |= __put_user(regs->r8, &sc->eax);
#if 0
err |= __put_user(current->tss.trap_no, &sc->trapno);
err |= __put_user(current->tss.error_code, &sc->err);
#endif
err |= __put_user(regs->cr_iip, &sc->eip);
err |= __put_user(regs->r17 & 0xffff, (unsigned int *)&sc->cs);
/*
* `eflags' is in an ar register for this context
*/
asm volatile ("mov %0=ar.eflag ;;" : "=r"(flag));
err |= __put_user((unsigned int)flag, &sc->eflags);
err |= __put_user(regs->r12, &sc->esp_at_signal);
err |= __put_user((regs->r17 >> 16) & 0xffff, (unsigned int *)&sc->ss);
#if 0
tmp = save_i387(fpstate);
if (tmp < 0)
err = 1;
else
err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
/* non-iBCS2 extensions.. */
#endif
err |= __put_user(mask, &sc->oldmask);
#if 0
err |= __put_user(current->tss.cr2, &sc->cr2);
#endif
return err;
}
static int
restore_sigcontext_ia32 (struct pt_regs *regs, struct sigcontext_ia32 *sc, int *peax)
{
unsigned int err = 0;
#define COPY(ia64x, ia32x) err |= __get_user(regs->ia64x, &sc->ia32x)
#define copyseg_gs(tmp) (regs->r16 |= (unsigned long) tmp << 48)
#define copyseg_fs(tmp) (regs->r16 |= (unsigned long) tmp << 32)
#define copyseg_cs(tmp) (regs->r17 |= tmp)
#define copyseg_ss(tmp) (regs->r17 |= (unsigned long) tmp << 16)
#define copyseg_es(tmp) (regs->r16 |= (unsigned long) tmp << 16)
#define copyseg_ds(tmp) (regs->r16 |= tmp)
#define COPY_SEG(seg) \
{ \
unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
copyseg_##seg(tmp); \
}
#define COPY_SEG_STRICT(seg) \
{ \
unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
copyseg_##seg(tmp|3); \
}
/* To make COPY_SEGs easier, we zero r16, r17 */
regs->r16 = 0;
regs->r17 = 0;
COPY_SEG(gs);
COPY_SEG(fs);
COPY_SEG(es);
COPY_SEG(ds);
COPY(r15, edi);
COPY(r14, esi);
COPY(r13, ebp);
COPY(r12, esp);
COPY(r11, ebx);
COPY(r10, edx);
COPY(r9, ecx);
COPY(cr_iip, eip);
COPY_SEG_STRICT(cs);
COPY_SEG_STRICT(ss);
ia32_load_segment_descriptors(current);
{
unsigned int tmpflags;
unsigned long flag;
/*
* IA32 `eflags' is not part of `pt_regs', it's in an ar register which
* is part of the thread context. Fortunately, we are executing in the
* IA32 process's context.
*/
err |= __get_user(tmpflags, &sc->eflags);
asm volatile ("mov %0=ar.eflag ;;" : "=r"(flag));
flag &= ~0x40DD5;
flag |= (tmpflags & 0x40DD5);
asm volatile ("mov ar.eflag=%0 ;;" :: "r"(flag));
regs->r1 = -1; /* disable syscall checks, r1 is orig_eax */
}
#if 0
{
struct _fpstate * buf;
err |= __get_user(buf, &sc->fpstate);
if (buf) {
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
err |= restore_i387(buf);
}
}
#endif
err |= __get_user(*peax, &sc->eax);
return err;
#if 0
badframe:
return 1;
#endif
}
/*
* Determine which stack to use..
*/
static inline void *
get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
{
unsigned long esp;
/* Default to using normal stack (truncate off sign-extension of bit 31: */
esp = (unsigned int) regs->r12;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (!on_sig_stack(esp))
esp = current->sas_ss_sp + current->sas_ss_size;
}
/* Legacy stack switching not supported */
return (void *)((esp - frame_size) & -8ul);
}
static int
setup_frame_ia32 (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
{
struct sigframe_ia32 *frame;
int err = 0;
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
err |= __put_user((current->exec_domain
&& current->exec_domain->signal_invmap
&& sig < 32
? (int)(current->exec_domain->signal_invmap[sig])
: sig),
&frame->sig);
err |= setup_sigcontext_ia32(&frame->sc, &frame->fpstate, regs, set->sig[0]);
if (_IA32_NSIG_WORDS > 1)
err |= __copy_to_user(frame->extramask, (char *) &set->sig + 4,
sizeof(frame->extramask));
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
unsigned int restorer = IA32_SA_RESTORER(ka);
err |= __put_user(restorer, &frame->pretcode);
} else {
err |= __put_user((long)frame->retcode, &frame->pretcode);
/* This is popl %eax ; movl $,%eax ; int $0x80 */
err |= __put_user(0xb858, (short *)(frame->retcode+0));
err |= __put_user(__IA32_NR_sigreturn & 0xffff, (short *)(frame->retcode+2));
err |= __put_user(__IA32_NR_sigreturn >> 16, (short *)(frame->retcode+4));
err |= __put_user(0x80cd, (short *)(frame->retcode+6));
}
if (err)
goto give_sigsegv;
/* Set up registers for signal handler */
regs->r12 = (unsigned long) frame;
regs->cr_iip = IA32_SA_HANDLER(ka);
set_fs(USER_DS);
regs->r16 = (__USER_DS << 16) | (__USER_DS); /* ES == DS, GS, FS are zero */
regs->r17 = (__USER_DS << 16) | __USER_CS;
#if 0
regs->eflags &= ~TF_MASK;
#endif
#if 0
printk("SIG deliver (%s:%d): sig=%d sp=%p pc=%lx ra=%x\n",
current->comm, current->pid, sig, (void *) frame, regs->cr_iip, frame->pretcode);
#endif
return 1;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
return 0;
}
static int
setup_rt_frame_ia32 (int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs * regs)
{
struct rt_sigframe_ia32 *frame;
int err = 0;
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
err |= __put_user((current->exec_domain
&& current->exec_domain->signal_invmap
&& sig < 32
? current->exec_domain->signal_invmap[sig]
: sig),
&frame->sig);
err |= __put_user((long)&frame->info, &frame->pinfo);
err |= __put_user((long)&frame->uc, &frame->puc);
err |= copy_siginfo_to_user32(&frame->info, info);
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->r12), &frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= setup_sigcontext_ia32(&frame->uc.uc_mcontext, &frame->fpstate, regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
unsigned int restorer = IA32_SA_RESTORER(ka);
err |= __put_user(restorer, &frame->pretcode);
} else {
err |= __put_user((long)frame->retcode, &frame->pretcode);
/* This is movl $,%eax ; int $0x80 */
err |= __put_user(0xb8, (char *)(frame->retcode+0));
err |= __put_user(__IA32_NR_rt_sigreturn, (int *)(frame->retcode+1));
err |= __put_user(0x80cd, (short *)(frame->retcode+5));
}
if (err)
goto give_sigsegv;
/* Set up registers for signal handler */
regs->r12 = (unsigned long) frame;
regs->cr_iip = IA32_SA_HANDLER(ka);
set_fs(USER_DS);
regs->r16 = (__USER_DS << 16) | (__USER_DS); /* ES == DS, GS, FS are zero */
regs->r17 = (__USER_DS << 16) | __USER_CS;
#if 0
regs->eflags &= ~TF_MASK;
#endif
#if 0
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%x\n",
current->comm, current->pid, (void *) frame, regs->cr_iip, frame->pretcode);
#endif
return 1;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
return 0;
}
int
ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
return setup_rt_frame_ia32(sig, ka, info, set, regs);
else
return setup_frame_ia32(sig, ka, set, regs);
}
asmlinkage long
sys32_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6, int arg7,
unsigned long stack)
{
struct pt_regs *regs = (struct pt_regs *) &stack;
unsigned long esp = (unsigned int) regs->r12;
struct sigframe_ia32 *frame = (struct sigframe_ia32 *)(esp - 8);
sigset_t set;
int eax;
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
|| (_IA32_NSIG_WORDS > 1 && __copy_from_user((char *) &set.sig + 4, &frame->extramask,
sizeof(frame->extramask))))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sigmask_lock);
current->blocked = (sigset_t) set;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
if (restore_sigcontext_ia32(regs, &frame->sc, &eax))
goto badframe;
return eax;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
asmlinkage long
sys32_rt_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6, int arg7,
unsigned long stack)
{
struct pt_regs *regs = (struct pt_regs *) &stack;
unsigned long esp = (unsigned int) regs->r12;
struct rt_sigframe_ia32 *frame = (struct rt_sigframe_ia32 *)(esp - 4);
sigset_t set;
stack_t st;
int eax;
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sigmask_lock);
current->blocked = set;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
if (restore_sigcontext_ia32(regs, &frame->uc.uc_mcontext, &eax))
goto badframe;
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
goto badframe;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
do_sigaltstack(&st, NULL, esp);
return eax;
badframe:
force_sig(SIGSEGV, current);
return 0;
}
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