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[MIPS] Add support for TIF_RESTORE_SIGMASK.

Browse source 
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
This commit is contained in:
Ralf Baechle 2006-02-08 12:58:41 +00:00
parent ac171c4666
commit 7b3e2fc847
6 changed files with 62 additions and 46 deletions
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4
arch/mips/kernel/process.c
View file

@ -58,8 +58,8 @@ ATTRIB_NORET void cpu_idle(void)
}
}
extern int do_signal(sigset_t *oldset, struct pt_regs *regs);
extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
extern int do_signal(struct pt_regs *regs);
extern int do_signal32(struct pt_regs *regs);
/*
* Native o32 and N64 ABI without DSP ASE

86
arch/mips/kernel/signal.c
View file

@ -39,8 +39,6 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
int do_signal(sigset_t *oldset, struct pt_regs *regs);
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
@ -50,7 +48,7 @@ save_static_function(sys_sigsuspend);
__attribute_used__ noinline static int
_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
sigset_t saveset, newset;
sigset_t newset;
sigset_t __user *uset;
uset = (sigset_t __user *) regs.regs[4];
@ -59,19 +57,15 @@ _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->saved_sigmask = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs.regs[2] = EINTR;
regs.regs[7] = 1;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, &regs))
return -EINTR;
}
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
#endif
@ -79,7 +73,7 @@ save_static_function(sys_rt_sigsuspend);
__attribute_used__ noinline static int
_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
sigset_t saveset, newset;
sigset_t newset;
sigset_t __user *unewset;
size_t sigsetsize;
@ -94,19 +88,15 @@ _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->saved_sigmask = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs.regs[2] = EINTR;
regs.regs[7] = 1;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, &regs))
return -EINTR;
}
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
#ifdef CONFIG_TRAD_SIGNALS
@ -315,11 +305,11 @@ int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, frame->regs[31]);
#endif
return 1;
return 0;
give_sigsegv:
force_sigsegv(signr, current);
return 0;
return -EFAULT;
}
#endif
@ -375,11 +365,11 @@ int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, regs->regs[31]);
#endif
return 1;
return 0;
give_sigsegv:
force_sigsegv(signr, current);
return 0;
return -EFAULT;
}
static inline int handle_signal(unsigned long sig, siginfo_t *info,
@ -393,7 +383,7 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
regs->regs[2] = EINTR;
break;
case ERESTARTSYS:
if(!(ka->sa.sa_flags & SA_RESTART)) {
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->regs[2] = EINTR;
break;
}
@ -420,9 +410,10 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
return ret;
}
int do_signal(sigset_t *oldset, struct pt_regs *regs)
int do_signal(struct pt_regs *regs)
{
struct k_sigaction ka;
sigset_t *oldset;
siginfo_t info;
int signr;
@ -437,12 +428,26 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
if (try_to_freeze())
goto no_signal;
if (!oldset)
if (test_thread_flag(TIF_RESTORE_SIGMASK))
oldset = &current->saved_sigmask;
else
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0)
return handle_signal(signr, &info, &ka, oldset, regs);
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 TIF_RESTORE_SIGMASK flag.
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
}
no_signal:
/*
@ -463,18 +468,27 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
regs->cp0_epc -= 4;
}
}
/*
* If there's no signal to deliver, we just put the saved sigmask
* back
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
}
return 0;
}
/*
* notification of userspace execution resumption
* - triggered by current->work.notify_resume
* - triggered by the TIF_WORK_MASK flags
*/
asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
__u32 thread_info_flags)
{
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING) {
current->thread.abi->do_signal(oldset, regs);
}
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
current->thread.abi->do_signal(regs);
}

8
arch/mips/kernel/signal32.c
View file

@ -694,11 +694,11 @@ int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, frame->sf_code);
#endif
return 1;
return 0;
give_sigsegv:
force_sigsegv(signr, current);
return 0;
return -EFAULT;
}
int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
@ -765,11 +765,11 @@ int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, frame->rs_code);
#endif
return 1;
return 0;
give_sigsegv:
force_sigsegv(signr, current);
return 0;
return -EFAULT;
}
static inline int handle_signal(unsigned long sig, siginfo_t *info,

4
arch/mips/kernel/signal_n32.c
View file

@ -186,9 +186,9 @@ int setup_rt_frame_n32(struct k_sigaction * ka,
current->comm, current->pid,
frame, regs->cp0_epc, regs->regs[31]);
#endif
return 1;
return 0;
give_sigsegv:
force_sigsegv(signr, current);
return 0;
return -EFAULT;
}

4
include/asm-mips/abi.h
View file

@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005 by Ralf Baechle
* Copyright (C) 2005, 06 by Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2005 MIPS Technologies, Inc.
*/
#ifndef _ASM_ABI_H
@ -13,7 +13,7 @@
#include <asm/siginfo.h>
struct mips_abi {
int (* const do_signal)(sigset_t *oldset, struct pt_regs *regs);
int (* const do_signal)(struct pt_regs *regs);
int (* const setup_frame)(struct k_sigaction * ka,
struct pt_regs *regs, int signr,
sigset_t *set);

2
include/asm-mips/thread_info.h
View file

@ -114,6 +114,7 @@ register struct thread_info *__current_thread_info __asm__("$28");
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_SECCOMP 5 /* secure computing */
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE 18
@ -125,6 +126,7 @@ register struct thread_info *__current_thread_info __asm__("$28");
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)