From 150256d8aadb3a337c31efa9e175cbd25bf06b06 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Wed, 18 Jan 2006 17:43:57 -0800 Subject: [PATCH] [PATCH] Generic sys_rt_sigsuspend() The TIF_RESTORE_SIGMASK flag allows us to have a generic implementation of sys_rt_sigsuspend() instead of duplicating it for each architecture. This provides such an implementation and makes arch/powerpc use it. It also tidies up the ppc32 sys_sigsuspend() to use TIF_RESTORE_SIGMASK. Signed-off-by: David Woodhouse Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/powerpc/kernel/signal_32.c | 56 +++------------------------------ arch/powerpc/kernel/signal_64.c | 36 --------------------- include/asm-powerpc/unistd.h | 2 ++ include/linux/sched.h | 1 + kernel/compat.c | 28 +++++++++++++++++ kernel/signal.c | 26 +++++++++++++++ 6 files changed, 62 insertions(+), 87 deletions(-) diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index 177bba78fb0b..7f0d5ce2567d 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -252,8 +252,7 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs); /* * Atomically swap in the new signal mask, and wait for a signal. */ -long sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7, - struct pt_regs *regs) +long sys_sigsuspend(old_sigset_t mask) { sigset_t saveset; @@ -264,55 +263,10 @@ long sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7, recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); - regs->result = -EINTR; - regs->gpr[3] = EINTR; - regs->ccr |= 0x10000000; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(&saveset, regs)) { - set_thread_flag(TIF_RESTOREALL); - return 0; - } - } -} - -long sys_rt_sigsuspend( -#ifdef CONFIG_PPC64 - compat_sigset_t __user *unewset, -#else - sigset_t __user *unewset, -#endif - size_t sigsetsize, int p3, int p4, - int p6, int p7, struct pt_regs *regs) -{ - sigset_t saveset, newset; - - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(sigset_t)) - return -EINVAL; - - if (get_sigset_t(&newset, unewset)) - return -EFAULT; - sigdelsetmask(&newset, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - current->blocked = newset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - regs->result = -EINTR; - regs->gpr[3] = EINTR; - regs->ccr |= 0x10000000; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(&saveset, regs)) { - set_thread_flag(TIF_RESTOREALL); - return 0; - } - } + current->state = TASK_INTERRUPTIBLE; + schedule(); + set_thread_flag(TIF_RESTORE_SIGMASK); + return -ERESTARTNOHAND; } #ifdef CONFIG_PPC32 diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c index 7b9d999e2115..a4a6812e815e 100644 --- a/arch/powerpc/kernel/signal_64.c +++ b/arch/powerpc/kernel/signal_64.c @@ -67,42 +67,6 @@ struct rt_sigframe { char abigap[288]; } __attribute__ ((aligned (16))); - -/* - * Atomically swap in the new signal mask, and wait for a signal. - */ -long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int p4, - int p6, int p7, struct pt_regs *regs) -{ - sigset_t saveset, newset; - - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(sigset_t)) - return -EINVAL; - - if (copy_from_user(&newset, unewset, sizeof(newset))) - return -EFAULT; - sigdelsetmask(&newset, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - current->blocked = newset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - regs->result = -EINTR; - regs->gpr[3] = EINTR; - regs->ccr |= 0x10000000; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(&saveset, regs)) { - set_thread_flag(TIF_RESTOREALL); - return 0; - } - } -} - long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, unsigned long r5, unsigned long r6, unsigned long r7, unsigned long r8, struct pt_regs *regs) diff --git a/include/asm-powerpc/unistd.h b/include/asm-powerpc/unistd.h index 19eaac3fbbf9..76daec496062 100644 --- a/include/asm-powerpc/unistd.h +++ b/include/asm-powerpc/unistd.h @@ -444,11 +444,13 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5, type6 arg6 #define __ARCH_WANT_SYS_SIGPENDING #define __ARCH_WANT_SYS_SIGPROCMASK #define __ARCH_WANT_SYS_RT_SIGACTION +#define __ARCH_WANT_SYS_RT_SIGSUSPEND #ifdef CONFIG_PPC32 #define __ARCH_WANT_OLD_STAT #endif #ifdef CONFIG_PPC64 #define __ARCH_WANT_COMPAT_SYS_TIME +#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND #endif /* diff --git a/include/linux/sched.h b/include/linux/sched.h index 2df1a1a2fee5..0cfcd1c7865e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -809,6 +809,7 @@ struct task_struct { struct sighand_struct *sighand; sigset_t blocked, real_blocked; + sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ struct sigpending pending; unsigned long sas_ss_sp; diff --git a/kernel/compat.c b/kernel/compat.c index 256e5d9f0647..1867290c37e3 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -871,3 +871,31 @@ asmlinkage long compat_sys_stime(compat_time_t __user *tptr) } #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ + +#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND +asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) +{ + sigset_t newset; + compat_sigset_t newset32; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(sigset_t)) + return -EINVAL; + + if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) + return -EFAULT; + sigset_from_compat(&newset, &newset32); + sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); + + spin_lock_irq(¤t->sighand->siglock); + current->saved_sigmask = current->blocked; + current->blocked = newset; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + current->state = TASK_INTERRUPTIBLE; + schedule(); + set_thread_flag(TIF_RESTORE_SIGMASK); + return -ERESTARTNOHAND; +} +#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ diff --git a/kernel/signal.c b/kernel/signal.c index 5dafbd36d62e..d3efafd8109a 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2721,6 +2721,32 @@ sys_pause(void) #endif +#ifdef __ARCH_WANT_SYS_RT_SIGSUSPEND +asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize) +{ + sigset_t newset; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(sigset_t)) + return -EINVAL; + + if (copy_from_user(&newset, unewset, sizeof(newset))) + return -EFAULT; + sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); + + spin_lock_irq(¤t->sighand->siglock); + current->saved_sigmask = current->blocked; + current->blocked = newset; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + current->state = TASK_INTERRUPTIBLE; + schedule(); + set_thread_flag(TIF_RESTORE_SIGMASK); + return -ERESTARTNOHAND; +} +#endif /* __ARCH_WANT_SYS_RT_SIGSUSPEND */ + void __init signals_init(void) { sigqueue_cachep =