5598473a5b
If we can't push the pending register windows onto the user's stack, we disallow signal delivery even if the signal would be delivered on a valid seperate signal stack. Add a register window save area in the signal frame, and store any unsavable windows there. On sigreturn, if any windows are still queued up in the signal frame, try to push them back onto the stack and if that fails we kill the process immediately. This allows the debug/tst-longjmp_chk2 glibc test case to pass. Signed-off-by: David S. Miller <davem@davemloft.net>
619 lines
18 KiB
C
619 lines
18 KiB
C
/*
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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, 2008 David S. Miller (davem@davemloft.net)
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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/tracehook.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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#include "sigutil.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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/* Skip %g7 as that's the thread register in userspace. */
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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_rwin_t *rwin_save;
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};
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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_restore_sigmask();
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return -ERESTARTNOHAND;
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}
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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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|
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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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|
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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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__siginfo_rwin_t __user *rwin_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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|
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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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|
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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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|
|
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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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|
|
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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));
|
|
|
|
err |= __get_user(fpu_save, &sf->fpu_save);
|
|
if (!err && fpu_save)
|
|
err |= restore_fpu_state(regs, fpu_save);
|
|
|
|
err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
|
|
err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
|
|
|
|
if (err)
|
|
goto segv;
|
|
|
|
err |= __get_user(rwin_save, &sf->rwin_save);
|
|
if (!err && rwin_save) {
|
|
if (restore_rwin_state(rwin_save))
|
|
goto segv;
|
|
}
|
|
|
|
regs->tpc = tpc;
|
|
regs->tnpc = tnpc;
|
|
|
|
/* Prevent syscall restart. */
|
|
pt_regs_clear_syscall(regs);
|
|
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
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spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
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recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
return;
|
|
segv:
|
|
force_sig(SIGSEGV, current);
|
|
}
|
|
|
|
/* Checks if the fp is valid */
|
|
static int invalid_frame_pointer(void __user *fp)
|
|
{
|
|
if (((unsigned long) fp) & 15)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
|
|
{
|
|
unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
|
|
|
|
/*
|
|
* If we are on the alternate signal stack and would overflow it, don't.
|
|
* Return an always-bogus address instead so we will die with SIGSEGV.
|
|
*/
|
|
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
|
|
return (void __user *) -1L;
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
|
if (sas_ss_flags(sp) == 0)
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
}
|
|
|
|
sp -= framesize;
|
|
|
|
/* Always align the stack frame. This handles two cases. First,
|
|
* sigaltstack need not be mindful of platform specific stack
|
|
* alignment. Second, if we took this signal because the stack
|
|
* is not aligned properly, we'd like to take the signal cleanly
|
|
* and report that.
|
|
*/
|
|
sp &= ~15UL;
|
|
|
|
return (void __user *) sp;
|
|
}
|
|
|
|
static inline int
|
|
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 wsaved, err, sf_size;
|
|
void __user *tail;
|
|
|
|
/* 1. Make sure everything is clean */
|
|
synchronize_user_stack();
|
|
save_and_clear_fpu();
|
|
|
|
wsaved = get_thread_wsaved();
|
|
|
|
sf_size = sizeof(struct rt_signal_frame);
|
|
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
|
|
sf_size += sizeof(__siginfo_fpu_t);
|
|
if (wsaved)
|
|
sf_size += sizeof(__siginfo_rwin_t);
|
|
sf = (struct rt_signal_frame __user *)
|
|
get_sigframe(ka, regs, sf_size);
|
|
|
|
if (invalid_frame_pointer (sf))
|
|
goto sigill;
|
|
|
|
tail = (sf + 1);
|
|
|
|
/* 2. Save the current process state */
|
|
err = copy_to_user(&sf->regs, regs, sizeof (*regs));
|
|
|
|
if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
|
|
__siginfo_fpu_t __user *fpu_save = tail;
|
|
tail += sizeof(__siginfo_fpu_t);
|
|
err |= save_fpu_state(regs, fpu_save);
|
|
err |= __put_user((u64)fpu_save, &sf->fpu_save);
|
|
} else {
|
|
err |= __put_user(0, &sf->fpu_save);
|
|
}
|
|
if (wsaved) {
|
|
__siginfo_rwin_t __user *rwin_save = tail;
|
|
tail += sizeof(__siginfo_rwin_t);
|
|
err |= save_rwin_state(wsaved, rwin_save);
|
|
err |= __put_user((u64)rwin_save, &sf->rwin_save);
|
|
set_thread_wsaved(0);
|
|
} else {
|
|
err |= __put_user(0, &sf->rwin_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));
|
|
|
|
if (!wsaved) {
|
|
err |= copy_in_user((u64 __user *)sf,
|
|
(u64 __user *)(regs->u_regs[UREG_FP] +
|
|
STACK_BIAS),
|
|
sizeof(struct reg_window));
|
|
} else {
|
|
struct reg_window *rp;
|
|
|
|
rp = ¤t_thread_info()->reg_window[wsaved - 1];
|
|
err |= copy_to_user(sf, rp, 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 0;
|
|
|
|
sigill:
|
|
do_exit(SIGILL);
|
|
return -EINVAL;
|
|
|
|
sigsegv:
|
|
force_sigsegv(signo, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
|
|
siginfo_t *info,
|
|
sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
int err;
|
|
|
|
err = setup_rt_frame(ka, regs, signr, oldset,
|
|
(ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
|
|
if (err)
|
|
return err;
|
|
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);
|
|
|
|
tracehook_signal_handler(signr, info, ka, regs, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 k_sigaction ka;
|
|
int restart_syscall;
|
|
sigset_t *oldset;
|
|
siginfo_t info;
|
|
int signr;
|
|
|
|
if (pt_regs_is_syscall(regs) &&
|
|
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
|
|
restart_syscall = 1;
|
|
} else
|
|
restart_syscall = 0;
|
|
|
|
if (current_thread_info()->status & TS_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 *,
|
|
int restart_syscall,
|
|
unsigned long orig_i0);
|
|
do_signal32(oldset, regs, restart_syscall, orig_i0);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
|
|
/* If the debugger messes with the program counter, it clears
|
|
* the software "in syscall" bit, directing us to not perform
|
|
* a syscall restart.
|
|
*/
|
|
if (restart_syscall && !pt_regs_is_syscall(regs))
|
|
restart_syscall = 0;
|
|
|
|
if (signr > 0) {
|
|
if (restart_syscall)
|
|
syscall_restart(orig_i0, regs, &ka.sa);
|
|
if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
|
|
/* 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 TS_RESTORE_SIGMASK flag.
|
|
*/
|
|
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
|
|
}
|
|
return;
|
|
}
|
|
if (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] = orig_i0;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
pt_regs_clear_syscall(regs);
|
|
}
|
|
if (restart_syscall &&
|
|
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
|
|
regs->u_regs[UREG_G1] = __NR_restart_syscall;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
pt_regs_clear_syscall(regs);
|
|
}
|
|
|
|
/* If there's no signal to deliver, we just put the saved sigmask
|
|
* back
|
|
*/
|
|
if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
|
|
current_thread_info()->status &= ~TS_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)
|
|
do_signal(regs, orig_i0);
|
|
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
tracehook_notify_resume(regs);
|
|
if (current->replacement_session_keyring)
|
|
key_replace_session_keyring();
|
|
}
|
|
}
|
|
|