X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsparc64%2Fkernel%2Fsignal.c;h=ca11a4c457d4244d0279770ffe08343693cf726d;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=9a8a3b6241e61cceab5ac29dd2f6ca007ccd513b;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c index 9a8a3b624..ca11a4c45 100644 --- a/arch/sparc64/kernel/signal.c +++ b/arch/sparc64/kernel/signal.c @@ -23,9 +23,9 @@ #include #include #include +#include #include -#include #include #include #include @@ -36,13 +36,11 @@ #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) -static int do_signal(sigset_t *oldset, struct pt_regs * regs, - unsigned long orig_o0, int ret_from_syscall); - /* {set, get}context() needed for 64-bit SparcLinux userland. */ asmlinkage void sparc64_set_context(struct pt_regs *regs) { - struct ucontext *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0]; + struct ucontext __user *ucp = (struct ucontext __user *) + regs->u_regs[UREG_I0]; mc_gregset_t __user *grp; unsigned long pc, npc, tstate; unsigned long fp, i7; @@ -52,7 +50,7 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs) flush_user_windows(); if (get_thread_wsaved() || (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || - (!__access_ok((unsigned long)ucp, sizeof(*ucp)))) + (!__access_ok(ucp, sizeof(*ucp)))) goto do_sigsegv; grp = &ucp->uc_mcontext.mc_gregs; err = __get_user(pc, &((*grp)[MC_PC])); @@ -83,8 +81,8 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs) regs->tnpc = npc; err |= __get_user(regs->y, &((*grp)[MC_Y])); err |= __get_user(tstate, &((*grp)[MC_TSTATE])); - regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); - regs->tstate |= (tstate & (TSTATE_ICC | TSTATE_XCC)); + regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); + regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); @@ -134,12 +132,13 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs) return; do_sigsegv: - do_exit(SIGSEGV); + force_sig(SIGSEGV, current); } asmlinkage void sparc64_get_context(struct pt_regs *regs) { - struct ucontext *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0]; + struct ucontext __user *ucp = (struct ucontext __user *) + regs->u_regs[UREG_I0]; mc_gregset_t __user *grp; mcontext_t __user *mcp; unsigned long fp, i7; @@ -224,7 +223,7 @@ asmlinkage void sparc64_get_context(struct pt_regs *regs) return; do_sigsegv: - do_exit(SIGSEGV); + force_sig(SIGSEGV, current); } struct rt_signal_frame { @@ -240,114 +239,29 @@ struct rt_signal_frame { /* Align macros */ #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) -/* - * atomically swap in the new signal mask, and wait for a signal. - * This is really tricky on the Sparc, watch out... - */ -asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs) +static long _sigpause_common(old_sigset_t set) { - sigset_t saveset; - -#ifdef CONFIG_SPARC32_COMPAT - if (test_thread_flag(TIF_32BIT)) { - extern asmlinkage void _sigpause32_common(compat_old_sigset_t, - struct pt_regs *); - _sigpause32_common(set, regs); - return; - } -#endif set &= _BLOCKABLE; spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; + current->saved_sigmask = current->blocked; siginitset(¤t->blocked, set); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); - - if (test_thread_flag(TIF_32BIT)) { - regs->tpc = (regs->tnpc & 0xffffffff); - regs->tnpc = (regs->tnpc + 4) & 0xffffffff; - } else { - regs->tpc = regs->tnpc; - regs->tnpc += 4; - } - - /* Condition codes and return value where set here for sigpause, - * and so got used by setup_frame, which again causes sigreturn() - * to return -EINTR. - */ - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - /* - * Return -EINTR and set condition code here, - * so the interrupted system call actually returns - * these. - */ - regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); - regs->u_regs[UREG_I0] = EINTR; - if (do_signal(&saveset, regs, 0, 0)) - return; - } -} -asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) -{ - _sigpause_common(set, regs); + current->state = TASK_INTERRUPTIBLE; + schedule(); + set_thread_flag(TIF_RESTORE_SIGMASK); + return -ERESTARTNOHAND; } -asmlinkage void do_sigsuspend(struct pt_regs *regs) +asmlinkage long sys_sigpause(unsigned int set) { - _sigpause_common(regs->u_regs[UREG_I0], regs); + return _sigpause_common(set); } -asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs) +asmlinkage long sys_sigsuspend(old_sigset_t set) { - sigset_t oldset, set; - - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(sigset_t)) { - regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); - regs->u_regs[UREG_I0] = EINVAL; - return; - } - if (copy_from_user(&set, uset, sizeof(set))) { - regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); - regs->u_regs[UREG_I0] = EFAULT; - return; - } - - sigdelsetmask(&set, ~_BLOCKABLE); - spin_lock_irq(¤t->sighand->siglock); - oldset = current->blocked; - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if (test_thread_flag(TIF_32BIT)) { - regs->tpc = (regs->tnpc & 0xffffffff); - regs->tnpc = (regs->tnpc + 4) & 0xffffffff; - } else { - regs->tpc = regs->tnpc; - regs->tnpc += 4; - } - - /* Condition codes and return value where set here for sigpause, - * and so got used by setup_frame, which again causes sigreturn() - * to return -EINTR. - */ - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - /* - * Return -EINTR and set condition code here, - * so the interrupted system call actually returns - * these. - */ - regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); - regs->u_regs[UREG_I0] = EINTR; - if (do_signal(&oldset, regs, 0, 0)) - return; - } + return _sigpause_common(set); } static inline int @@ -406,9 +320,9 @@ void do_rt_sigreturn(struct pt_regs *regs) err |= __get_user(tstate, &sf->regs.tstate); err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); - /* User can only change condition codes in %tstate. */ - regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); - regs->tstate |= (tstate & (TSTATE_ICC | TSTATE_XCC)); + /* User can only change condition codes and %asi in %tstate. */ + regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); + regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); err |= __get_user(fpu_save, &sf->fpu_save); if (fpu_save) @@ -427,7 +341,7 @@ void do_rt_sigreturn(struct pt_regs *regs) call it and ignore errors. */ old_fs = get_fs(); set_fs(KERNEL_DS); - do_sigaltstack(&st, NULL, (unsigned long)sf); + do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); set_fs(old_fs); sigdelsetmask(&set, ~_BLOCKABLE); @@ -437,7 +351,7 @@ void do_rt_sigreturn(struct pt_regs *regs) spin_unlock_irq(¤t->sighand->siglock); return; segv: - send_sig(SIGSEGV, current, 1); + force_sig(SIGSEGV, current); } /* Checks if the fp is valid */ @@ -543,6 +457,12 @@ setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, regs->u_regs[UREG_I0] = signo; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + /* The sigcontext is passed in this way because of how it + * is defined in GLIBC's /usr/include/bits/sigcontext.h + * for sparc64. It includes the 128 bytes of siginfo_t. + */ + regs->u_regs[UREG_I2] = (unsigned long) &sf->info; + /* 5. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); @@ -557,7 +477,7 @@ setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, sigill: do_exit(SIGILL); sigsegv: - do_exit(SIGSEGV); + force_sigsegv(signo, current); } static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, @@ -566,15 +486,12 @@ static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, { setup_rt_frame(ka, regs, signr, oldset, (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); - if (ka->sa.sa_flags & SA_ONESHOT) - ka->sa.sa_handler = SIG_DFL; - if (!(ka->sa.sa_flags & SA_NOMASK)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + if (!(ka->sa.sa_flags & SA_NOMASK)) sigaddset(¤t->blocked,signr); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); } static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, @@ -602,38 +519,46 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, * want to handle. Thus you cannot kill init even with a SIGKILL even by * mistake. */ -static int do_signal(sigset_t *oldset, struct pt_regs * regs, - unsigned long orig_i0, int restart_syscall) +static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall) { siginfo_t info; struct signal_deliver_cookie cookie; + struct k_sigaction ka; int signr; + sigset_t *oldset; cookie.restart_syscall = restart_syscall; cookie.orig_i0 = orig_i0; - if (!oldset) + if (test_thread_flag(TIF_RESTORE_SIGMASK)) + oldset = ¤t->saved_sigmask; + else oldset = ¤t->blocked; #ifdef CONFIG_SPARC32_COMPAT if (test_thread_flag(TIF_32BIT)) { - extern int do_signal32(sigset_t *, struct pt_regs *, - unsigned long, int); - return do_signal32(oldset, regs, orig_i0, - cookie.restart_syscall); + extern void do_signal32(sigset_t *, struct pt_regs *, + unsigned long, int); + do_signal32(oldset, regs, orig_i0, + cookie.restart_syscall); + return; } #endif - signr = get_signal_to_deliver(&info, regs, &cookie); + signr = get_signal_to_deliver(&info, &ka, regs, &cookie); if (signr > 0) { - struct k_sigaction *ka; - - ka = ¤t->sighand->action[signr-1]; - if (cookie.restart_syscall) - syscall_restart(orig_i0, regs, &ka->sa); - handle_signal(signr, ka, &info, oldset, regs); - return 1; + syscall_restart(orig_i0, regs, &ka.sa); + 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 TIF_RESTORE_SIGMASK flag. + */ + if (test_thread_flag(TIF_RESTORE_SIGMASK)) + clear_thread_flag(TIF_RESTORE_SIGMASK); + return; } if (cookie.restart_syscall && (regs->u_regs[UREG_I0] == ERESTARTNOHAND || @@ -650,15 +575,21 @@ static int do_signal(sigset_t *oldset, struct pt_regs * regs, regs->tpc -= 4; regs->tnpc -= 4; } - return 0; + + /* 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, ¤t->saved_sigmask, NULL); + } } -void do_notify_resume(sigset_t *oldset, struct pt_regs *regs, - unsigned long orig_i0, int restart_syscall, +void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall, unsigned long thread_info_flags) { - if (thread_info_flags & _TIF_SIGPENDING) - do_signal(oldset, regs, orig_i0, restart_syscall); + if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) + do_signal(regs, orig_i0, restart_syscall); } void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)