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-rw-r--r--arch/ppc/kernel/signal.c771
1 files changed, 0 insertions, 771 deletions
diff --git a/arch/ppc/kernel/signal.c b/arch/ppc/kernel/signal.c
deleted file mode 100644
index 2244bf91e59..00000000000
--- a/arch/ppc/kernel/signal.c
+++ /dev/null
@@ -1,771 +0,0 @@
-/*
- * 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(&current->sighand->siglock);
- saveset = current->blocked;
- siginitset(&current->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(&current->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(&current->sighand->siglock);
- saveset = current->blocked;
- current->blocked = newset;
- recalc_sigpending();
- spin_unlock_irq(&current->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(&regs->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(&current->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(&current->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(&current->sighand->siglock);
- current->blocked = *set;
- recalc_sigpending();
- spin_unlock_irq(&current->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,
- &current->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 __user *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 __user *)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 (try_to_freeze()) {
- signr = 0;
- if (!signal_pending(current))
- goto no_signal;
- }
-
- if (!oldset)
- oldset = &current->blocked;
-
- newsp = frame = 0;
-
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- no_signal:
- 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 {
- 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);
-
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,&current->blocked,&ka.sa.sa_mask);
- if (!(ka.sa.sa_flags & SA_NODEFER))
- sigaddset(&current->blocked, signr);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- return 1;
-}
-