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Merge branch 'x86-signal-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-signal-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Kill handle_signal()->set_fs()
  x86, do_signal: Simplify the TS_RESTORE_SIGMASK logic
  x86, signals: Convert the X86_32 code to use set_current_blocked()
  x86, signals: Convert the IA32_EMULATION code to use set_current_blocked()
This commit is contained in:
Linus Torvalds 2011-07-22 17:04:32 -07:00
parent 9e39264ed4 73d382decc
commit 8051207959
2 changed files with 27 additions and 51 deletions
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22
arch/x86/ia32/ia32_signal.c
View File

@ -127,15 +127,17 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
{
mask &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
sigset_t blocked;
current->saved_sigmask = current->blocked;
siginitset(&current->blocked, mask);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
mask &= _BLOCKABLE;
siginitset(&blocked, mask);
set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_restore_sigmask();
return -ERESTARTNOHAND;
}
@ -279,10 +281,7 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
set_current_blocked(&set);
if (ia32_restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
@ -308,10 +307,7 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
set_current_blocked(&set);
if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;

56
arch/x86/kernel/signal.c
View File

@ -485,17 +485,18 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
asmlinkage int
sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
mask &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
sigset_t blocked;
current->saved_sigmask = current->blocked;
siginitset(&current->blocked, mask);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
mask &= _BLOCKABLE;
siginitset(&blocked, mask);
set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_restore_sigmask();
set_restore_sigmask();
return -ERESTARTNOHAND;
}
@ -572,10 +573,7 @@ unsigned long sys_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
set_current_blocked(&set);
if (restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
@ -653,11 +651,15 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
static int
setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
struct pt_regs *regs)
{
int usig = signr_convert(sig);
sigset_t *set = &current->blocked;
int ret;
if (current_thread_info()->status & TS_RESTORE_SIGMASK)
set = &current->saved_sigmask;
/* Set up the stack frame */
if (is_ia32) {
if (ka->sa.sa_flags & SA_SIGINFO)
@ -672,12 +674,13 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
return -EFAULT;
}
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
return ret;
}
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
struct pt_regs *regs)
{
sigset_t blocked;
int ret;
@ -712,20 +715,11 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
ret = setup_rt_frame(sig, ka, info, oldset, regs);
ret = setup_rt_frame(sig, ka, info, regs);
if (ret)
return ret;
#ifdef CONFIG_X86_64
/*
* This has nothing to do with segment registers,
* despite the name. This magic affects uaccess.h
* macros' behavior. Reset it to the normal setting.
*/
set_fs(USER_DS);
#endif
/*
* Clear the direction flag as per the ABI for function entry.
*/
@ -767,7 +761,6 @@ static void do_signal(struct pt_regs *regs)
struct k_sigaction ka;
siginfo_t info;
int signr;
sigset_t *oldset;
/*
* We want the common case to go fast, which is why we may in certain
@ -779,23 +772,10 @@ static void do_signal(struct pt_regs *regs)
if (!user_mode(regs))
return;
if (current_thread_info()->status & TS_RESTORE_SIGMASK)
oldset = &current->saved_sigmask;
else
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
/*
* A signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TS_RESTORE_SIGMASK flag.
*/
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
handle_signal(signr, &info, &ka, regs);
return;
}
@ -823,7 +803,7 @@ static void do_signal(struct pt_regs *regs)
*/
if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
set_current_blocked(&current->saved_sigmask);
}
}