powerpc: move ppc64/kernel/signal.c to arch/powerpc
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
Stephen Rothwell
@@ -13,7 +13,7 @@ endif
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obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
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signal_32.o pmc.o
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obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
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ptrace32.o systbl.o
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signal_64.o ptrace32.o systbl.o
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obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o
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obj-$(CONFIG_POWER4) += idle_power4.o
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obj-$(CONFIG_PPC_OF) += of_device.o
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581
arch/powerpc/kernel/signal_64.c
Normal file
581
arch/powerpc/kernel/signal_64.c
Normal file
@@ -0,0 +1,581 @@
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/*
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* linux/arch/ppc64/kernel/signal.c
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/i386/kernel/signal.c"
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* Copyright (C) 1991, 1992 Linus Torvalds
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/elf.h>
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#include <linux/ptrace.h>
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#include <linux/module.h>
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#include <asm/sigcontext.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/ppcdebug.h>
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#include <asm/unistd.h>
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#include <asm/cacheflush.h>
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#include <asm/vdso.h>
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
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#define FP_REGS_SIZE sizeof(elf_fpregset_t)
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#define TRAMP_TRACEBACK 3
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#define TRAMP_SIZE 6
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/*
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* When we have signals to deliver, we set up on the user stack,
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* going down from the original stack pointer:
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* 1) a rt_sigframe struct which contains the ucontext
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* 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
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* frame for the signal handler.
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*/
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struct rt_sigframe {
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/* sys_rt_sigreturn requires the ucontext be the first field */
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struct ucontext uc;
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unsigned long _unused[2];
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unsigned int tramp[TRAMP_SIZE];
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struct siginfo *pinfo;
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void *puc;
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struct siginfo info;
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/* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
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char abigap[288];
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} __attribute__ ((aligned (16)));
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int p4,
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int p6, int p7, struct pt_regs *regs)
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{
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sigset_t saveset, newset;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (copy_from_user(&newset, unewset, sizeof(newset)))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs->result = -EINTR;
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regs->gpr[3] = EINTR;
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regs->ccr |= 0x10000000;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(&saveset, regs))
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return 0;
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}
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}
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long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, unsigned long r5,
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unsigned long r6, unsigned long r7, unsigned long r8,
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struct pt_regs *regs)
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{
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return do_sigaltstack(uss, uoss, regs->gpr[1]);
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}
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/*
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* Set up the sigcontext for the signal frame.
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*/
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static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
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int signr, sigset_t *set, unsigned long handler)
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{
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/* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
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* process never used altivec yet (MSR_VEC is zero in pt_regs of
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* the context). This is very important because we must ensure we
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* don't lose the VRSAVE content that may have been set prior to
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* the process doing its first vector operation
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* Userland shall check AT_HWCAP to know wether it can rely on the
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* v_regs pointer or not
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*/
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#ifdef CONFIG_ALTIVEC
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elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
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#endif
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long err = 0;
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flush_fp_to_thread(current);
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/* Make sure signal doesn't get spurrious FP exceptions */
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current->thread.fpscr.val = 0;
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#ifdef CONFIG_ALTIVEC
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err |= __put_user(v_regs, &sc->v_regs);
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/* save altivec registers */
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if (current->thread.used_vr) {
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flush_altivec_to_thread(current);
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/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
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err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
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/* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
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* contains valid data.
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*/
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regs->msr |= MSR_VEC;
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}
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/* We always copy to/from vrsave, it's 0 if we don't have or don't
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* use altivec.
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*/
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err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
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#else /* CONFIG_ALTIVEC */
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err |= __put_user(0, &sc->v_regs);
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#endif /* CONFIG_ALTIVEC */
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err |= __put_user(&sc->gp_regs, &sc->regs);
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err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
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err |= __copy_to_user(&sc->fp_regs, ¤t->thread.fpr, FP_REGS_SIZE);
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err |= __put_user(signr, &sc->signal);
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err |= __put_user(handler, &sc->handler);
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if (set != NULL)
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err |= __put_user(set->sig[0], &sc->oldmask);
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return err;
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}
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/*
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* Restore the sigcontext from the signal frame.
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*/
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static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
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struct sigcontext __user *sc)
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{
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#ifdef CONFIG_ALTIVEC
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elf_vrreg_t __user *v_regs;
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#endif
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unsigned long err = 0;
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unsigned long save_r13 = 0;
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elf_greg_t *gregs = (elf_greg_t *)regs;
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#ifdef CONFIG_ALTIVEC
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unsigned long msr;
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#endif
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int i;
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/* If this is not a signal return, we preserve the TLS in r13 */
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if (!sig)
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save_r13 = regs->gpr[13];
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/* copy everything before MSR */
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err |= __copy_from_user(regs, &sc->gp_regs,
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PT_MSR*sizeof(unsigned long));
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/* skip MSR and SOFTE */
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for (i = PT_MSR+1; i <= PT_RESULT; i++) {
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if (i == PT_SOFTE)
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continue;
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err |= __get_user(gregs[i], &sc->gp_regs[i]);
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}
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if (!sig)
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regs->gpr[13] = save_r13;
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err |= __copy_from_user(¤t->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
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if (set != NULL)
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err |= __get_user(set->sig[0], &sc->oldmask);
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#ifdef CONFIG_ALTIVEC
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err |= __get_user(v_regs, &sc->v_regs);
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err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
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if (err)
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return err;
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/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
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if (v_regs != 0 && (msr & MSR_VEC) != 0)
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err |= __copy_from_user(current->thread.vr, v_regs,
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33 * sizeof(vector128));
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else if (current->thread.used_vr)
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memset(current->thread.vr, 0, 33 * sizeof(vector128));
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/* Always get VRSAVE back */
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if (v_regs != 0)
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err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
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else
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current->thread.vrsave = 0;
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#endif /* CONFIG_ALTIVEC */
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#ifndef CONFIG_SMP
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preempt_disable();
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if (last_task_used_math == current)
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last_task_used_math = NULL;
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if (last_task_used_altivec == current)
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last_task_used_altivec = NULL;
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preempt_enable();
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#endif
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/* Force reload of FP/VEC */
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regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC);
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return err;
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}
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/*
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* Allocate space for the signal frame
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*/
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static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
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size_t frame_size)
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{
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unsigned long newsp;
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/* Default to using normal stack */
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newsp = regs->gpr[1];
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (! on_sig_stack(regs->gpr[1]))
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newsp = (current->sas_ss_sp + current->sas_ss_size);
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}
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return (void __user *)((newsp - frame_size) & -16ul);
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}
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/*
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* Setup the trampoline code on the stack
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*/
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static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
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{
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int i;
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long err = 0;
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/* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
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err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
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/* li r0, __NR_[rt_]sigreturn| */
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err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
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/* sc */
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err |= __put_user(0x44000002UL, &tramp[2]);
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/* Minimal traceback info */
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for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
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err |= __put_user(0, &tramp[i]);
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if (!err)
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flush_icache_range((unsigned long) &tramp[0],
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(unsigned long) &tramp[TRAMP_SIZE]);
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return err;
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}
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/*
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* Restore the user process's signal mask (also used by signal32.c)
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*/
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void restore_sigmask(sigset_t *set)
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{
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sigdelsetmask(set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = *set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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/*
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* Handle {get,set,swap}_context operations
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*/
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int sys_swapcontext(struct ucontext __user *old_ctx,
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struct ucontext __user *new_ctx,
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long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
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{
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unsigned char tmp;
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sigset_t set;
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/* Context size is for future use. Right now, we only make sure
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* we are passed something we understand
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*/
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if (ctx_size < sizeof(struct ucontext))
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return -EINVAL;
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if (old_ctx != NULL) {
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if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
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|| setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0)
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|| __copy_to_user(&old_ctx->uc_sigmask,
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¤t->blocked, sizeof(sigset_t)))
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return -EFAULT;
|
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}
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if (new_ctx == NULL)
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return 0;
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if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
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|| __get_user(tmp, (u8 __user *) new_ctx)
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|| __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
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return -EFAULT;
|
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|
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/*
|
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* If we get a fault copying the context into the kernel's
|
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* image of the user's registers, we can't just return -EFAULT
|
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* because the user's registers will be corrupted. For instance
|
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* the NIP value may have been updated but not some of the
|
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* other registers. Given that we have done the access_ok
|
||||
* and successfully read the first and last bytes of the region
|
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* above, this should only happen in an out-of-memory situation
|
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* or if another thread unmaps the region containing the context.
|
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* We kill the task with a SIGSEGV in this situation.
|
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*/
|
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|
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if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
|
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do_exit(SIGSEGV);
|
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restore_sigmask(&set);
|
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if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
|
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do_exit(SIGSEGV);
|
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|
||||
/* This returns like rt_sigreturn */
|
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return 0;
|
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}
|
||||
|
||||
|
||||
/*
|
||||
* Do a signal return; undo the signal stack.
|
||||
*/
|
||||
|
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int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
|
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unsigned long r6, unsigned long r7, unsigned long r8,
|
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struct pt_regs *regs)
|
||||
{
|
||||
struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
|
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sigset_t set;
|
||||
|
||||
/* Always make any pending restarted system calls return -EINTR */
|
||||
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
||||
|
||||
if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
|
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goto badframe;
|
||||
|
||||
if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
|
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goto badframe;
|
||||
restore_sigmask(&set);
|
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if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
|
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goto badframe;
|
||||
|
||||
/* do_sigaltstack expects a __user pointer and won't modify
|
||||
* what's in there anyway
|
||||
*/
|
||||
do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
|
||||
|
||||
return regs->result;
|
||||
|
||||
badframe:
|
||||
#if DEBUG_SIG
|
||||
printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
|
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regs, uc, &uc->uc_mcontext);
|
||||
#endif
|
||||
force_sig(SIGSEGV, current);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
|
||||
sigset_t *set, struct pt_regs *regs)
|
||||
{
|
||||
/* Handler is *really* a pointer to the function descriptor for
|
||||
* the signal routine. The first entry in the function
|
||||
* descriptor is the entry address of signal and the second
|
||||
* entry is the TOC value we need to use.
|
||||
*/
|
||||
func_descr_t __user *funct_desc_ptr;
|
||||
struct rt_sigframe __user *frame;
|
||||
unsigned long newsp = 0;
|
||||
long err = 0;
|
||||
|
||||
frame = get_sigframe(ka, regs, sizeof(*frame));
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
||||
goto badframe;
|
||||
|
||||
err |= __put_user(&frame->info, &frame->pinfo);
|
||||
err |= __put_user(&frame->uc, &frame->puc);
|
||||
err |= copy_siginfo_to_user(&frame->info, info);
|
||||
if (err)
|
||||
goto badframe;
|
||||
|
||||
/* Create the ucontext. */
|
||||
err |= __put_user(0, &frame->uc.uc_flags);
|
||||
err |= __put_user(0, &frame->uc.uc_link);
|
||||
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
||||
err |= __put_user(sas_ss_flags(regs->gpr[1]),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL,
|
||||
(unsigned long)ka->sa.sa_handler);
|
||||
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
if (err)
|
||||
goto badframe;
|
||||
|
||||
/* Set up to return from userspace. */
|
||||
if (vdso64_rt_sigtramp && current->thread.vdso_base) {
|
||||
regs->link = current->thread.vdso_base + vdso64_rt_sigtramp;
|
||||
} else {
|
||||
err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
|
||||
if (err)
|
||||
goto badframe;
|
||||
regs->link = (unsigned long) &frame->tramp[0];
|
||||
}
|
||||
funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
|
||||
|
||||
/* Allocate a dummy caller frame for the signal handler. */
|
||||
newsp = (unsigned long)frame - __SIGNAL_FRAMESIZE;
|
||||
err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
|
||||
|
||||
/* Set up "regs" so we "return" to the signal handler. */
|
||||
err |= get_user(regs->nip, &funct_desc_ptr->entry);
|
||||
regs->gpr[1] = newsp;
|
||||
err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
|
||||
regs->gpr[3] = signr;
|
||||
regs->result = 0;
|
||||
if (ka->sa.sa_flags & SA_SIGINFO) {
|
||||
err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
|
||||
err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
|
||||
regs->gpr[6] = (unsigned long) frame;
|
||||
} else {
|
||||
regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
|
||||
}
|
||||
if (err)
|
||||
goto badframe;
|
||||
|
||||
if (test_thread_flag(TIF_SINGLESTEP))
|
||||
ptrace_notify(SIGTRAP);
|
||||
|
||||
return 1;
|
||||
|
||||
badframe:
|
||||
#if DEBUG_SIG
|
||||
printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
|
||||
regs, frame, newsp);
|
||||
#endif
|
||||
force_sigsegv(signr, current);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* OK, we're invoking a handler
|
||||
*/
|
||||
static int handle_signal(unsigned long sig, struct k_sigaction *ka,
|
||||
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Set up Signal Frame */
|
||||
ret = setup_rt_frame(sig, ka, info, oldset, regs);
|
||||
|
||||
if (ret) {
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
|
||||
if (!(ka->sa.sa_flags & SA_NODEFER))
|
||||
sigaddset(¤t->blocked,sig);
|
||||
recalc_sigpending();
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
|
||||
{
|
||||
switch ((int)regs->result) {
|
||||
case -ERESTART_RESTARTBLOCK:
|
||||
case -ERESTARTNOHAND:
|
||||
/* ERESTARTNOHAND means that the syscall should only be
|
||||
* restarted if there was no handler for the signal, and since
|
||||
* we only get here if there is a handler, we dont restart.
|
||||
*/
|
||||
regs->result = -EINTR;
|
||||
break;
|
||||
case -ERESTARTSYS:
|
||||
/* ERESTARTSYS means to restart the syscall if there is no
|
||||
* handler or the handler was registered with SA_RESTART
|
||||
*/
|
||||
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
||||
regs->result = -EINTR;
|
||||
break;
|
||||
}
|
||||
/* fallthrough */
|
||||
case -ERESTARTNOINTR:
|
||||
/* ERESTARTNOINTR means that the syscall should be
|
||||
* called again after the signal handler returns.
|
||||
*/
|
||||
regs->gpr[3] = regs->orig_gpr3;
|
||||
regs->nip -= 4;
|
||||
regs->result = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
int signr;
|
||||
struct k_sigaction ka;
|
||||
|
||||
/*
|
||||
* If the current thread is 32 bit - invoke the
|
||||
* 32 bit signal handling code
|
||||
*/
|
||||
if (test_thread_flag(TIF_32BIT))
|
||||
return do_signal32(oldset, regs);
|
||||
|
||||
if (!oldset)
|
||||
oldset = ¤t->blocked;
|
||||
|
||||
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
||||
if (signr > 0) {
|
||||
/* Whee! Actually deliver the signal. */
|
||||
if (TRAP(regs) == 0x0C00)
|
||||
syscall_restart(regs, &ka);
|
||||
|
||||
/*
|
||||
* Reenable the DABR before delivering the signal to
|
||||
* user space. The DABR will have been cleared if it
|
||||
* triggered inside the kernel.
|
||||
*/
|
||||
if (current->thread.dabr)
|
||||
set_dabr(current->thread.dabr);
|
||||
|
||||
return handle_signal(signr, &ka, &info, oldset, regs);
|
||||
}
|
||||
|
||||
if (TRAP(regs) == 0x0C00) { /* System Call! */
|
||||
if ((int)regs->result == -ERESTARTNOHAND ||
|
||||
(int)regs->result == -ERESTARTSYS ||
|
||||
(int)regs->result == -ERESTARTNOINTR) {
|
||||
regs->gpr[3] = regs->orig_gpr3;
|
||||
regs->nip -= 4; /* Back up & retry system call */
|
||||
regs->result = 0;
|
||||
} else if ((int)regs->result == -ERESTART_RESTARTBLOCK) {
|
||||
regs->gpr[0] = __NR_restart_syscall;
|
||||
regs->nip -= 4;
|
||||
regs->result = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(do_signal);
|
||||
Reference in New Issue
Block a user