diff options
Diffstat (limited to 'arch/ppc/kernel/signal.c')
| -rw-r--r-- | arch/ppc/kernel/signal.c | 775 |
1 files changed, 775 insertions, 0 deletions
diff --git a/arch/ppc/kernel/signal.c b/arch/ppc/kernel/signal.c new file mode 100644 index 000000000000..9567d3041ea7 --- /dev/null +++ b/arch/ppc/kernel/signal.c @@ -0,0 +1,775 @@ +/* + * arch/ppc/kernel/signal.c + * + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Derived from "arch/i386/kernel/signal.c" + * Copyright (C) 1991, 1992 Linus Torvalds + * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/elf.h> +#include <linux/tty.h> +#include <linux/binfmts.h> +#include <linux/suspend.h> +#include <asm/ucontext.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> +#include <asm/cacheflush.h> + +#undef DEBUG_SIG + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +extern void sigreturn_exit(struct pt_regs *); + +#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) + +int do_signal(sigset_t *oldset, struct pt_regs *regs); + +/* + * Atomically swap in the new signal mask, and wait for a signal. + */ +int +sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7, + struct pt_regs *regs) +{ + sigset_t saveset; + + mask &= _BLOCKABLE; + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + siginitset(¤t->blocked, mask); + 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)) + sigreturn_exit(regs); + } +} + +int +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)) + sigreturn_exit(regs); + } +} + + +int +sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, + int r6, int r7, int r8, struct pt_regs *regs) +{ + return do_sigaltstack(uss, uoss, regs->gpr[1]); +} + +int +sys_sigaction(int sig, const struct old_sigaction __user *act, + struct old_sigaction __user *oact) +{ + struct k_sigaction new_ka, old_ka; + int ret; + + if (act) { + old_sigset_t mask; + if (!access_ok(VERIFY_READ, act, sizeof(*act)) || + __get_user(new_ka.sa.sa_handler, &act->sa_handler) || + __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) + return -EFAULT; + __get_user(new_ka.sa.sa_flags, &act->sa_flags); + __get_user(mask, &act->sa_mask); + siginitset(&new_ka.sa.sa_mask, mask); + } + + ret = do_sigaction(sig, (act? &new_ka: NULL), (oact? &old_ka: NULL)); + + if (!ret && oact) { + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || + __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || + __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) + return -EFAULT; + __put_user(old_ka.sa.sa_flags, &oact->sa_flags); + __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); + } + + return ret; +} + +/* + * When we have signals to deliver, we set up on the + * user stack, going down from the original stack pointer: + * a sigregs struct + * a sigcontext struct + * a gap of __SIGNAL_FRAMESIZE bytes + * + * Each of these things must be a multiple of 16 bytes in size. + * + */ +struct sigregs { + struct mcontext mctx; /* all the register values */ + /* Programs using the rs6000/xcoff abi can save up to 19 gp regs + and 18 fp regs below sp before decrementing it. */ + int abigap[56]; +}; + +/* We use the mc_pad field for the signal return trampoline. */ +#define tramp mc_pad + +/* + * When we have rt signals to deliver, we set up on the + * user stack, going down from the original stack pointer: + * one rt_sigframe struct (siginfo + ucontext + ABI gap) + * a gap of __SIGNAL_FRAMESIZE+16 bytes + * (the +16 is to get the siginfo and ucontext in the same + * positions as in older kernels). + * + * Each of these things must be a multiple of 16 bytes in size. + * + */ +struct rt_sigframe +{ + struct siginfo info; + struct ucontext uc; + /* Programs using the rs6000/xcoff abi can save up to 19 gp regs + and 18 fp regs below sp before decrementing it. */ + int abigap[56]; +}; + +/* + * Save the current user registers on the user stack. + * We only save the altivec/spe registers if the process has used + * altivec/spe instructions at some point. + */ +static int +save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, int sigret) +{ + /* save general and floating-point registers */ + CHECK_FULL_REGS(regs); + preempt_disable(); + if (regs->msr & MSR_FP) + giveup_fpu(current); +#ifdef CONFIG_ALTIVEC + if (current->thread.used_vr && (regs->msr & MSR_VEC)) + giveup_altivec(current); +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_SPE + if (current->thread.used_spe && (regs->msr & MSR_SPE)) + giveup_spe(current); +#endif /* CONFIG_ALTIVEC */ + preempt_enable(); + + if (__copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE) + || __copy_to_user(&frame->mc_fregs, current->thread.fpr, + ELF_NFPREG * sizeof(double))) + return 1; + + current->thread.fpscr = 0; /* turn off all fp exceptions */ + +#ifdef CONFIG_ALTIVEC + /* save altivec registers */ + if (current->thread.used_vr) { + if (__copy_to_user(&frame->mc_vregs, current->thread.vr, + ELF_NVRREG * sizeof(vector128))) + return 1; + /* set MSR_VEC in the saved MSR value to indicate that + frame->mc_vregs contains valid data */ + if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) + return 1; + } + /* else assert((regs->msr & MSR_VEC) == 0) */ + + /* We always copy to/from vrsave, it's 0 if we don't have or don't + * use altivec. Since VSCR only contains 32 bits saved in the least + * significant bits of a vector, we "cheat" and stuff VRSAVE in the + * most significant bits of that same vector. --BenH + */ + if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) + return 1; +#endif /* CONFIG_ALTIVEC */ + +#ifdef CONFIG_SPE + /* save spe registers */ + if (current->thread.used_spe) { + if (__copy_to_user(&frame->mc_vregs, current->thread.evr, + ELF_NEVRREG * sizeof(u32))) + return 1; + /* set MSR_SPE in the saved MSR value to indicate that + frame->mc_vregs contains valid data */ + if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) + return 1; + } + /* else assert((regs->msr & MSR_SPE) == 0) */ + + /* We always copy to/from spefscr */ + if (__put_user(current->thread.spefscr, (u32 *)&frame->mc_vregs + ELF_NEVRREG)) + return 1; +#endif /* CONFIG_SPE */ + + if (sigret) { + /* Set up the sigreturn trampoline: li r0,sigret; sc */ + if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) + || __put_user(0x44000002UL, &frame->tramp[1])) + return 1; + flush_icache_range((unsigned long) &frame->tramp[0], + (unsigned long) &frame->tramp[2]); + } + + return 0; +} + +/* + * Restore the current user register values from the user stack, + * (except for MSR). + */ +static int +restore_user_regs(struct pt_regs *regs, struct mcontext __user *sr, int sig) +{ + unsigned long save_r2 = 0; +#if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE) + unsigned long msr; +#endif + + /* backup/restore the TLS as we don't want it to be modified */ + if (!sig) + save_r2 = regs->gpr[2]; + /* copy up to but not including MSR */ + if (__copy_from_user(regs, &sr->mc_gregs, PT_MSR * sizeof(elf_greg_t))) + return 1; + /* copy from orig_r3 (the word after the MSR) up to the end */ + if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], + GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) + return 1; + if (!sig) + regs->gpr[2] = save_r2; + + /* force the process to reload the FP registers from + current->thread when it next does FP instructions */ + regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); + if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, + sizeof(sr->mc_fregs))) + return 1; + +#ifdef CONFIG_ALTIVEC + /* force the process to reload the altivec registers from + current->thread when it next does altivec instructions */ + regs->msr &= ~MSR_VEC; + if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { + /* restore altivec registers from the stack */ + if (__copy_from_user(current->thread.vr, &sr->mc_vregs, + sizeof(sr->mc_vregs))) + return 1; + } else if (current->thread.used_vr) + memset(¤t->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); + + /* Always get VRSAVE back */ + if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) + return 1; +#endif /* CONFIG_ALTIVEC */ + +#ifdef CONFIG_SPE + /* force the process to reload the spe registers from + current->thread when it next does spe instructions */ + regs->msr &= ~MSR_SPE; + if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) { + /* restore spe registers from the stack */ + if (__copy_from_user(current->thread.evr, &sr->mc_vregs, + ELF_NEVRREG * sizeof(u32))) + return 1; + } else if (current->thread.used_spe) + memset(¤t->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); + + /* Always get SPEFSCR back */ + if (__get_user(current->thread.spefscr, (u32 *)&sr->mc_vregs + ELF_NEVRREG)) + return 1; +#endif /* CONFIG_SPE */ + +#ifndef CONFIG_SMP + preempt_disable(); + if (last_task_used_math == current) + last_task_used_math = NULL; + if (last_task_used_altivec == current) + last_task_used_altivec = NULL; + if (last_task_used_spe == current) + last_task_used_spe = NULL; + preempt_enable(); +#endif + return 0; +} + +/* + * Restore the user process's signal mask + */ +static void +restore_sigmask(sigset_t *set) +{ + sigdelsetmask(set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = *set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); +} + +/* + * Set up a signal frame for a "real-time" signal handler + * (one which gets siginfo). + */ +static void +handle_rt_signal(unsigned long sig, struct k_sigaction *ka, + siginfo_t *info, sigset_t *oldset, struct pt_regs * regs, + unsigned long newsp) +{ + struct rt_sigframe __user *rt_sf; + struct mcontext __user *frame; + unsigned long origsp = newsp; + + /* Set up Signal Frame */ + /* Put a Real Time Context onto stack */ + newsp -= sizeof(*rt_sf); + rt_sf = (struct rt_sigframe __user *) newsp; + + /* create a stack frame for the caller of the handler */ + newsp -= __SIGNAL_FRAMESIZE + 16; + + if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) + goto badframe; + + /* Put the siginfo & fill in most of the ucontext */ + if (copy_siginfo_to_user(&rt_sf->info, info) + || __put_user(0, &rt_sf->uc.uc_flags) + || __put_user(0, &rt_sf->uc.uc_link) + || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) + || __put_user(sas_ss_flags(regs->gpr[1]), + &rt_sf->uc.uc_stack.ss_flags) + || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) + || __put_user(&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs) + || __copy_to_user(&rt_sf->uc.uc_sigmask, oldset, sizeof(*oldset))) + goto badframe; + + /* Save user registers on the stack */ + frame = &rt_sf->uc.uc_mcontext; + if (save_user_regs(regs, frame, __NR_rt_sigreturn)) + goto badframe; + + if (put_user(regs->gpr[1], (unsigned long __user *)newsp)) + goto badframe; + regs->gpr[1] = newsp; + regs->gpr[3] = sig; + regs->gpr[4] = (unsigned long) &rt_sf->info; + regs->gpr[5] = (unsigned long) &rt_sf->uc; + regs->gpr[6] = (unsigned long) rt_sf; + regs->nip = (unsigned long) ka->sa.sa_handler; + regs->link = (unsigned long) frame->tramp; + regs->trap = 0; + + return; + +badframe: +#ifdef DEBUG_SIG + printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", + regs, frame, newsp); +#endif + force_sigsegv(sig, current); +} + +static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) +{ + sigset_t set; + struct mcontext __user *mcp; + + if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(set)) + || __get_user(mcp, &ucp->uc_regs)) + return -EFAULT; + restore_sigmask(&set); + if (restore_user_regs(regs, mcp, sig)) + return -EFAULT; + + return 0; +} + +int sys_swapcontext(struct ucontext __user *old_ctx, + struct ucontext __user *new_ctx, + int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) +{ + unsigned char tmp; + + /* Context size is for future use. Right now, we only make sure + * we are passed something we understand + */ + if (ctx_size < sizeof(struct ucontext)) + return -EINVAL; + + if (old_ctx != NULL) { + if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) + || save_user_regs(regs, &old_ctx->uc_mcontext, 0) + || __copy_to_user(&old_ctx->uc_sigmask, + ¤t->blocked, sizeof(sigset_t)) + || __put_user(&old_ctx->uc_mcontext, &old_ctx->uc_regs)) + return -EFAULT; + } + if (new_ctx == NULL) + return 0; + if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) + || __get_user(tmp, (u8 __user *) new_ctx) + || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) + return -EFAULT; + + /* + * If we get a fault copying the context into the kernel's + * image of the user's registers, we can't just return -EFAULT + * because the user's registers will be corrupted. For instance + * the NIP value may have been updated but not some of the + * other registers. Given that we have done the access_ok + * and successfully read the first and last bytes of the region + * above, this should only happen in an out-of-memory situation + * or if another thread unmaps the region containing the context. + * We kill the task with a SIGSEGV in this situation. + */ + if (do_setcontext(new_ctx, regs, 0)) + do_exit(SIGSEGV); + sigreturn_exit(regs); + /* doesn't actually return back to here */ + return 0; +} + +int sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, + struct pt_regs *regs) +{ + struct rt_sigframe __user *rt_sf; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + rt_sf = (struct rt_sigframe __user *) + (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); + if (!access_ok(VERIFY_READ, rt_sf, sizeof(struct rt_sigframe))) + goto bad; + if (do_setcontext(&rt_sf->uc, regs, 1)) + goto bad; + + /* + * It's not clear whether or why it is desirable to save the + * sigaltstack setting on signal delivery and restore it on + * signal return. But other architectures do this and we have + * always done it up until now so it is probably better not to + * change it. -- paulus + */ + do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); + + sigreturn_exit(regs); /* doesn't return here */ + return 0; + + bad: + force_sig(SIGSEGV, current); + return 0; +} + +int sys_debug_setcontext(struct ucontext __user *ctx, + int ndbg, struct sig_dbg_op *dbg, + int r6, int r7, int r8, + struct pt_regs *regs) +{ + struct sig_dbg_op op; + int i; + unsigned long new_msr = regs->msr; +#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) + unsigned long new_dbcr0 = current->thread.dbcr0; +#endif + + for (i=0; i<ndbg; i++) { + if (__copy_from_user(&op, dbg, sizeof(op))) + return -EFAULT; + switch (op.dbg_type) { + case SIG_DBG_SINGLE_STEPPING: +#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) + if (op.dbg_value) { + new_msr |= MSR_DE; + new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); + } else { + new_msr &= ~MSR_DE; + new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); + } +#else + if (op.dbg_value) + new_msr |= MSR_SE; + else + new_msr &= ~MSR_SE; +#endif + break; + case SIG_DBG_BRANCH_TRACING: +#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) + return -EINVAL; +#else + if (op.dbg_value) + new_msr |= MSR_BE; + else + new_msr &= ~MSR_BE; +#endif + break; + + default: + return -EINVAL; + } + } + + /* We wait until here to actually install the values in the + registers so if we fail in the above loop, it will not + affect the contents of these registers. After this point, + failure is a problem, anyway, and it's very unlikely unless + the user is really doing something wrong. */ + regs->msr = new_msr; +#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) + current->thread.dbcr0 = new_dbcr0; +#endif + + /* + * If we get a fault copying the context into the kernel's + * image of the user's registers, we can't just return -EFAULT + * because the user's registers will be corrupted. For instance + * the NIP value may have been updated but not some of the + * other registers. Given that we have done the access_ok + * and successfully read the first and last bytes of the region + * above, this should only happen in an out-of-memory situation + * or if another thread unmaps the region containing the context. + * We kill the task with a SIGSEGV in this situation. + */ + if (do_setcontext(ctx, regs, 1)) { + force_sig(SIGSEGV, current); + goto out; + } + + /* + * It's not clear whether or why it is desirable to save the + * sigaltstack setting on signal delivery and restore it on + * signal return. But other architectures do this and we have + * always done it up until now so it is probably better not to + * change it. -- paulus + */ + do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); + + sigreturn_exit(regs); + /* doesn't actually return back to here */ + + out: + return 0; +} + +/* + * OK, we're invoking a handler + */ +static void +handle_signal(unsigned long sig, struct k_sigaction *ka, + siginfo_t *info, sigset_t *oldset, struct pt_regs * regs, + unsigned long newsp) +{ + struct sigcontext __user *sc; + struct sigregs __user *frame; + unsigned long origsp = newsp; + + /* Set up Signal Frame */ + newsp -= sizeof(struct sigregs); + frame = (struct sigregs __user *) newsp; + + /* Put a sigcontext on the stack */ + newsp -= sizeof(*sc); + sc = (struct sigcontext __user *) newsp; + + /* create a stack frame for the caller of the handler */ + newsp -= __SIGNAL_FRAMESIZE; + + if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) + goto badframe; + +#if _NSIG != 64 +#error "Please adjust handle_signal()" +#endif + if (__put_user((unsigned long) ka->sa.sa_handler, &sc->handler) + || __put_user(oldset->sig[0], &sc->oldmask) + || __put_user(oldset->sig[1], &sc->_unused[3]) + || __put_user((struct pt_regs *)frame, &sc->regs) + || __put_user(sig, &sc->signal)) + goto badframe; + + if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) + goto badframe; + + if (put_user(regs->gpr[1], (unsigned long __user *)newsp)) + goto badframe; + regs->gpr[1] = newsp; + regs->gpr[3] = sig; + regs->gpr[4] = (unsigned long) sc; + regs->nip = (unsigned long) ka->sa.sa_handler; + regs->link = (unsigned long) frame->mctx.tramp; + regs->trap = 0; + + return; + +badframe: +#ifdef DEBUG_SIG + printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", + regs, frame, newsp); +#endif + force_sigsegv(sig, current); +} + +/* + * Do a signal return; undo the signal stack. + */ +int sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, + struct pt_regs *regs) +{ + struct sigcontext __user *sc; + struct sigcontext sigctx; + struct mcontext __user *sr; + sigset_t set; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); + if (copy_from_user(&sigctx, sc, sizeof(sigctx))) + goto badframe; + + set.sig[0] = sigctx.oldmask; + set.sig[1] = sigctx._unused[3]; + restore_sigmask(&set); + + sr = (struct mcontext __user *) sigctx.regs; + if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) + || restore_user_regs(regs, sr, 1)) + goto badframe; + + sigreturn_exit(regs); /* doesn't return */ + return 0; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +/* + * Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + */ +int do_signal(sigset_t *oldset, struct pt_regs *regs) +{ + siginfo_t info; + struct k_sigaction ka; + unsigned long frame, newsp; + int signr, ret; + + if (current->flags & PF_FREEZE) { + refrigerator(PF_FREEZE); + signr = 0; + ret = regs->gpr[3]; + if (!signal_pending(current)) + goto no_signal; + } + + if (!oldset) + oldset = ¤t->blocked; + + newsp = frame = 0; + + signr = get_signal_to_deliver(&info, &ka, regs, NULL); + + if (TRAP(regs) == 0x0C00 /* System Call! */ + && regs->ccr & 0x10000000 /* error signalled */ + && ((ret = regs->gpr[3]) == ERESTARTSYS + || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR + || ret == ERESTART_RESTARTBLOCK)) { + + if (signr > 0 + && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK + || (ret == ERESTARTSYS + && !(ka.sa.sa_flags & SA_RESTART)))) { + /* make the system call return an EINTR error */ + regs->result = -EINTR; + regs->gpr[3] = EINTR; + /* note that the cr0.SO bit is already set */ + } else { +no_signal: + regs->nip -= 4; /* Back up & retry system call */ + regs->result = 0; + regs->trap = 0; + if (ret == ERESTART_RESTARTBLOCK) + regs->gpr[0] = __NR_restart_syscall; + else + regs->gpr[3] = regs->orig_gpr3; + } + } + + if (signr == 0) + return 0; /* no signals delivered */ + + if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size + && !on_sig_stack(regs->gpr[1])) + newsp = current->sas_ss_sp + current->sas_ss_size; + else + newsp = regs->gpr[1]; + newsp &= ~0xfUL; + + /* Whee! Actually deliver the signal. */ + if (ka.sa.sa_flags & SA_SIGINFO) + handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); + else + handle_signal(signr, &ka, &info, oldset, regs, newsp); + + 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, signr); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + } + + return 1; +} + |