diff options
Diffstat (limited to 'arch/microblaze/kernel/signal.c')
| -rw-r--r-- | arch/microblaze/kernel/signal.c | 106 |
1 files changed, 43 insertions, 63 deletions
diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c index 599671168980..76b9722557db 100644 --- a/arch/microblaze/kernel/signal.c +++ b/arch/microblaze/kernel/signal.c @@ -31,6 +31,7 @@ #include <linux/personality.h> #include <linux/percpu.h> #include <linux/linkage.h> +#include <linux/tracehook.h> #include <asm/entry.h> #include <asm/ucontext.h> #include <linux/uaccess.h> @@ -40,10 +41,6 @@ #include <asm/cacheflush.h> #include <asm/syscalls.h> -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall); - asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, struct pt_regs *regs) @@ -98,17 +95,16 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) sigset_t set; int rval; + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + if (!access_ok(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->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + set_current_blocked(&set); if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval)) goto badframe; @@ -169,7 +165,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) return (void __user *)((sp - frame_size) & -8UL); } -static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, +static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set, struct pt_regs *regs) { struct rt_sigframe __user *frame; @@ -267,12 +263,11 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, current->comm, current->pid, frame, regs->pc); #endif - return; + return 0; give_sigsegv: - if (sig == SIGSEGV) - ka->sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); + force_sigsegv(sig, current); + return -EFAULT; } /* Handle restarting system calls */ @@ -312,28 +307,23 @@ do_restart: * OK, we're invoking a handler */ -static int +static void handle_signal(unsigned long sig, struct k_sigaction *ka, - siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) + siginfo_t *info, struct pt_regs *regs) { + sigset_t *oldset = sigmask_to_save(); + int ret; + /* Set up the stack frame */ if (ka->sa.sa_flags & SA_SIGINFO) - setup_rt_frame(sig, ka, info, oldset, regs); + ret = setup_rt_frame(sig, ka, info, oldset, regs); else - setup_rt_frame(sig, ka, NULL, oldset, regs); - - if (ka->sa.sa_flags & SA_ONESHOT) - ka->sa.sa_handler = SIG_DFL; - - if (!(ka->sa.sa_flags & SA_NODEFER)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, - ¤t->blocked, &ka->sa.sa_mask); - sigaddset(¤t->blocked, sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } - return 1; + ret = setup_rt_frame(sig, ka, NULL, oldset, regs); + + if (ret) + return; + + signal_delivered(sig, info, ka, regs, 0); } /* @@ -345,46 +335,24 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, * the kernel can handle, and then we build all the user-level signal handling * stack-frames in one go after that. */ -int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall) +static void do_signal(struct pt_regs *regs, int in_syscall) { siginfo_t info; int signr; struct k_sigaction ka; #ifdef DEBUG_SIG - printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall); + printk(KERN_INFO "do signal: %p %d\n", regs, in_syscall); printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1, regs->r12, current_thread_info()->flags); #endif - /* - * 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 (kernel_mode(regs)) - return 1; - - if (current_thread_info()->status & TS_RESTORE_SIGMASK) - oldset = ¤t->saved_sigmask; - else - oldset = ¤t->blocked; signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { /* Whee! Actually deliver the signal. */ if (in_syscall) handle_restart(regs, &ka, 1); - if (handle_signal(signr, &ka, &info, oldset, regs)) { - /* - * 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; - } - return 1; + handle_signal(signr, &ka, &info, regs); + return; } if (in_syscall) @@ -394,11 +362,23 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall) * If there's no signal to deliver, we just put the saved sigmask * back. */ - if (current_thread_info()->status & TS_RESTORE_SIGMASK) { - current_thread_info()->status &= ~TS_RESTORE_SIGMASK; - sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); - } + restore_saved_sigmask(); +} - /* Did we come from a system call? */ - return 0; +void do_notify_resume(struct pt_regs *regs, int in_syscall) +{ + /* + * 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 (kernel_mode(regs)) + return; + + if (test_thread_flag(TIF_SIGPENDING)) + do_signal(regs, in_syscall); + + if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) + tracehook_notify_resume(regs); } |