forked from Minki/linux
dc5dc7e6d7
We need to be more liberal about the alignment of the buffer given to us by sigaltstack(). The user should not need to be mindful of all of the alignment constraints we have for the stack frame. This mirrors how we handle this situation in clone() as well. Also, we align the stack even in non-SA_ONSTACK cases so that signals due to bad stack alignment can be delivered properly. This makes such errors easier to debug and recover from. Finally, add the sanity check x86 has to make sure we won't overflow the signal stack. This fixes glibc testcases nptl/tst-cancel20.c and nptl/tst-cancelx20.c Signed-off-by: David S. Miller <davem@davemloft.net>
624 lines
19 KiB
C
624 lines
19 KiB
C
/* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
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* arch/sparc64/kernel/signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
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* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#ifdef CONFIG_COMPAT
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#include <linux/compat.h> /* for compat_old_sigset_t */
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#endif
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#include <linux/sched.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/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/binfmts.h>
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#include <linux/bitops.h>
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#include <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/pgtable.h>
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#include <asm/fpumacro.h>
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#include <asm/uctx.h>
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#include <asm/siginfo.h>
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#include <asm/visasm.h>
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#include "entry.h"
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#include "systbls.h"
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/* {set, get}context() needed for 64-bit SparcLinux userland. */
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asmlinkage void sparc64_set_context(struct pt_regs *regs)
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{
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struct ucontext __user *ucp = (struct ucontext __user *)
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regs->u_regs[UREG_I0];
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mc_gregset_t __user *grp;
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unsigned long pc, npc, tstate;
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unsigned long fp, i7;
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unsigned char fenab;
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int err;
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flush_user_windows();
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if (get_thread_wsaved() ||
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(((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
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(!__access_ok(ucp, sizeof(*ucp))))
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goto do_sigsegv;
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grp = &ucp->uc_mcontext.mc_gregs;
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err = __get_user(pc, &((*grp)[MC_PC]));
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err |= __get_user(npc, &((*grp)[MC_NPC]));
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if (err || ((pc | npc) & 3))
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goto do_sigsegv;
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if (regs->u_regs[UREG_I1]) {
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sigset_t set;
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if (_NSIG_WORDS == 1) {
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if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
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goto do_sigsegv;
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} else {
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if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
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goto do_sigsegv;
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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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if (test_thread_flag(TIF_32BIT)) {
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pc &= 0xffffffff;
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npc &= 0xffffffff;
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}
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regs->tpc = pc;
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regs->tnpc = npc;
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err |= __get_user(regs->y, &((*grp)[MC_Y]));
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err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
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regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
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regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
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err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
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err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
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err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
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err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
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err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
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err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
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err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
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err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
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err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
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err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
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err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
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err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
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err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
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err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
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err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
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err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
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err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
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err |= __put_user(fp,
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
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err |= __put_user(i7,
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
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err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
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if (fenab) {
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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fprs_write(0);
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err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
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if (fprs & FPRS_DL)
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err |= copy_from_user(fpregs,
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_from_user(fpregs+16,
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((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
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(sizeof(unsigned int) * 32));
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err |= __get_user(current_thread_info()->xfsr[0],
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
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err |= __get_user(current_thread_info()->gsr[0],
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
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regs->tstate &= ~TSTATE_PEF;
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}
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if (err)
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goto do_sigsegv;
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return;
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do_sigsegv:
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force_sig(SIGSEGV, current);
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}
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asmlinkage void sparc64_get_context(struct pt_regs *regs)
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{
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struct ucontext __user *ucp = (struct ucontext __user *)
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regs->u_regs[UREG_I0];
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mc_gregset_t __user *grp;
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mcontext_t __user *mcp;
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unsigned long fp, i7;
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unsigned char fenab;
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int err;
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synchronize_user_stack();
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if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
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goto do_sigsegv;
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#if 1
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fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
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#else
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fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
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#endif
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mcp = &ucp->uc_mcontext;
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grp = &mcp->mc_gregs;
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/* Skip over the trap instruction, first. */
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if (test_thread_flag(TIF_32BIT)) {
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regs->tpc = (regs->tnpc & 0xffffffff);
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regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
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} else {
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regs->tpc = regs->tnpc;
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regs->tnpc += 4;
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}
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err = 0;
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if (_NSIG_WORDS == 1)
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err |= __put_user(current->blocked.sig[0],
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(unsigned long __user *)&ucp->uc_sigmask);
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else
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err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked,
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sizeof(sigset_t));
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err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
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err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
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err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
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err |= __put_user(regs->y, &((*grp)[MC_Y]));
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err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
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err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
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err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
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err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
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err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
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err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
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err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
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err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
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err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
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err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
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err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
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err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
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err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
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err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
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err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
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err |= __get_user(fp,
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
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err |= __get_user(i7,
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
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err |= __put_user(fp, &(mcp->mc_fp));
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err |= __put_user(i7, &(mcp->mc_i7));
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err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
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if (fenab) {
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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fprs = current_thread_info()->fpsaved[0];
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if (fprs & FPRS_DL)
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err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_to_user(
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((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
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(sizeof(unsigned int) * 32));
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err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
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err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
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err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
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}
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if (err)
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goto do_sigsegv;
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return;
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do_sigsegv:
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force_sig(SIGSEGV, current);
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}
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struct rt_signal_frame {
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struct sparc_stackf ss;
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siginfo_t info;
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struct pt_regs regs;
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__siginfo_fpu_t __user *fpu_save;
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stack_t stack;
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sigset_t mask;
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__siginfo_fpu_t fpu_state;
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};
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static long _sigpause_common(old_sigset_t set)
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{
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set &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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current->saved_sigmask = current->blocked;
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siginitset(¤t->blocked, set);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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set_thread_flag(TIF_RESTORE_SIGMASK);
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return -ERESTARTNOHAND;
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}
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asmlinkage long sys_sigpause(unsigned int set)
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{
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return _sigpause_common(set);
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}
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asmlinkage long sys_sigsuspend(old_sigset_t set)
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{
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return _sigpause_common(set);
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}
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static inline int
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restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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int err;
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err = __get_user(fprs, &fpu->si_fprs);
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fprs_write(0);
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regs->tstate &= ~TSTATE_PEF;
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if (fprs & FPRS_DL)
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err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
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(sizeof(unsigned int) * 32));
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err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
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err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
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current_thread_info()->fpsaved[0] |= fprs;
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return err;
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}
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void do_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_signal_frame __user *sf;
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unsigned long tpc, tnpc, tstate;
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__siginfo_fpu_t __user *fpu_save;
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sigset_t set;
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int err;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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synchronize_user_stack ();
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sf = (struct rt_signal_frame __user *)
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(regs->u_regs [UREG_FP] + STACK_BIAS);
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/* 1. Make sure we are not getting garbage from the user */
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if (((unsigned long) sf) & 3)
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goto segv;
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err = get_user(tpc, &sf->regs.tpc);
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err |= __get_user(tnpc, &sf->regs.tnpc);
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if (test_thread_flag(TIF_32BIT)) {
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tpc &= 0xffffffff;
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tnpc &= 0xffffffff;
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}
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err |= ((tpc | tnpc) & 3);
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/* 2. Restore the state */
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err |= __get_user(regs->y, &sf->regs.y);
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err |= __get_user(tstate, &sf->regs.tstate);
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err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
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/* User can only change condition codes and %asi in %tstate. */
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regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
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regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
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err |= __get_user(fpu_save, &sf->fpu_save);
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if (fpu_save)
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err |= restore_fpu_state(regs, &sf->fpu_state);
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err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
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err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
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if (err)
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goto segv;
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regs->tpc = tpc;
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regs->tnpc = tnpc;
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/* Prevent syscall restart. */
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pt_regs_clear_trap_type(regs);
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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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return;
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segv:
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force_sig(SIGSEGV, current);
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}
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/* Checks if the fp is valid */
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static int invalid_frame_pointer(void __user *fp, int fplen)
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{
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if (((unsigned long) fp) & 7)
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return 1;
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return 0;
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}
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static inline int
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save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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int err = 0;
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fprs = current_thread_info()->fpsaved[0];
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if (fprs & FPRS_DL)
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err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
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(sizeof(unsigned int) * 32));
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err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
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err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
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err |= __put_user(fprs, &fpu->si_fprs);
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return err;
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}
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static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
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{
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unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
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/*
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* If we are on the alternate signal stack and would overflow it, don't.
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* Return an always-bogus address instead so we will die with SIGSEGV.
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*/
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if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
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return (void __user *) -1L;
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (sas_ss_flags(sp) == 0)
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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/* Always align the stack frame. This handles two cases. First,
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* sigaltstack need not be mindful of platform specific stack
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* alignment. Second, if we took this signal because the stack
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* is not aligned properly, we'd like to take the signal cleanly
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* and report that.
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*/
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sp &= ~7UL;
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return (void __user *)(sp - framesize);
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}
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static inline void
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setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
|
|
int signo, sigset_t *oldset, siginfo_t *info)
|
|
{
|
|
struct rt_signal_frame __user *sf;
|
|
int sigframe_size, err;
|
|
|
|
/* 1. Make sure everything is clean */
|
|
synchronize_user_stack();
|
|
save_and_clear_fpu();
|
|
|
|
sigframe_size = sizeof(struct rt_signal_frame);
|
|
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
|
|
sigframe_size -= sizeof(__siginfo_fpu_t);
|
|
|
|
sf = (struct rt_signal_frame __user *)
|
|
get_sigframe(ka, regs, sigframe_size);
|
|
|
|
if (invalid_frame_pointer (sf, sigframe_size))
|
|
goto sigill;
|
|
|
|
if (get_thread_wsaved() != 0)
|
|
goto sigill;
|
|
|
|
/* 2. Save the current process state */
|
|
err = copy_to_user(&sf->regs, regs, sizeof (*regs));
|
|
|
|
if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
|
|
err |= save_fpu_state(regs, &sf->fpu_state);
|
|
err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
|
|
} else {
|
|
err |= __put_user(0, &sf->fpu_save);
|
|
}
|
|
|
|
/* Setup sigaltstack */
|
|
err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
|
|
err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
|
|
|
|
err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
|
|
|
|
err |= copy_in_user((u64 __user *)sf,
|
|
(u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
|
|
sizeof(struct reg_window));
|
|
|
|
if (info)
|
|
err |= copy_siginfo_to_user(&sf->info, info);
|
|
else {
|
|
err |= __put_user(signo, &sf->info.si_signo);
|
|
err |= __put_user(SI_NOINFO, &sf->info.si_code);
|
|
}
|
|
if (err)
|
|
goto sigsegv;
|
|
|
|
/* 3. signal handler back-trampoline and parameters */
|
|
regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
|
|
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);
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
regs->tpc &= 0xffffffff;
|
|
regs->tnpc &= 0xffffffff;
|
|
}
|
|
/* 4. return to kernel instructions */
|
|
regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
|
|
return;
|
|
|
|
sigill:
|
|
do_exit(SIGILL);
|
|
sigsegv:
|
|
force_sigsegv(signo, current);
|
|
}
|
|
|
|
static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
|
|
siginfo_t *info,
|
|
sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
setup_rt_frame(ka, regs, signr, oldset,
|
|
(ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
|
|
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);
|
|
}
|
|
|
|
static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
|
|
struct sigaction *sa)
|
|
{
|
|
switch (regs->u_regs[UREG_I0]) {
|
|
case ERESTART_RESTARTBLOCK:
|
|
case ERESTARTNOHAND:
|
|
no_system_call_restart:
|
|
regs->u_regs[UREG_I0] = EINTR;
|
|
regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
|
|
break;
|
|
case ERESTARTSYS:
|
|
if (!(sa->sa_flags & SA_RESTART))
|
|
goto no_system_call_restart;
|
|
/* fallthrough */
|
|
case ERESTARTNOINTR:
|
|
regs->u_regs[UREG_I0] = orig_i0;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
}
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
|
|
{
|
|
struct signal_deliver_cookie cookie;
|
|
struct k_sigaction ka;
|
|
sigset_t *oldset;
|
|
siginfo_t info;
|
|
int signr;
|
|
|
|
if (pt_regs_is_syscall(regs) &&
|
|
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
|
|
pt_regs_clear_trap_type(regs);
|
|
cookie.restart_syscall = 1;
|
|
} else
|
|
cookie.restart_syscall = 0;
|
|
cookie.orig_i0 = orig_i0;
|
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
oldset = ¤t->saved_sigmask;
|
|
else
|
|
oldset = ¤t->blocked;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
extern void do_signal32(sigset_t *, struct pt_regs *,
|
|
struct signal_deliver_cookie *);
|
|
do_signal32(oldset, regs, &cookie);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
|
|
if (signr > 0) {
|
|
if (cookie.restart_syscall)
|
|
syscall_restart(cookie.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 ||
|
|
regs->u_regs[UREG_I0] == ERESTARTSYS ||
|
|
regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
|
|
/* replay the system call when we are done */
|
|
regs->u_regs[UREG_I0] = cookie.orig_i0;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
}
|
|
if (cookie.restart_syscall &&
|
|
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
|
|
regs->u_regs[UREG_G1] = __NR_restart_syscall;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
}
|
|
|
|
/* 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(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
|
|
{
|
|
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
|
|
do_signal(regs, orig_i0);
|
|
}
|
|
|
|
void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
|
|
{
|
|
struct signal_deliver_cookie *cp = cookie;
|
|
|
|
if (cp->restart_syscall &&
|
|
(regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
|
|
regs->u_regs[UREG_I0] == ERESTARTSYS ||
|
|
regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
|
|
/* replay the system call when we are done */
|
|
regs->u_regs[UREG_I0] = cp->orig_i0;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
cp->restart_syscall = 0;
|
|
}
|
|
if (cp->restart_syscall &&
|
|
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
|
|
regs->u_regs[UREG_G1] = __NR_restart_syscall;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
cp->restart_syscall = 0;
|
|
}
|
|
}
|