/* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $ * arch/sparc64/kernel/signal.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <linux/config.h> #ifdef CONFIG_SPARC32_COMPAT #include <linux/compat.h> /* for compat_old_sigset_t */ #endif #include <linux/sched.h> #include <linux/kernel.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/wait.h> #include <linux/ptrace.h> #include <linux/unistd.h> #include <linux/mm.h> #include <linux/tty.h> #include <linux/smp_lock.h> #include <linux/binfmts.h> #include <linux/bitops.h> #include <asm/uaccess.h> #include <asm/ptrace.h> #include <asm/svr4.h> #include <asm/pgtable.h> #include <asm/fpumacro.h> #include <asm/uctx.h> #include <asm/siginfo.h> #include <asm/visasm.h> #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) static int do_signal(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_o0, int ret_from_syscall); /* {set, get}context() needed for 64-bit SparcLinux userland. */ asmlinkage void sparc64_set_context(struct pt_regs *regs) { struct ucontext __user *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0]; mc_gregset_t __user *grp; unsigned long pc, npc, tstate; unsigned long fp, i7; unsigned char fenab; int err; flush_user_windows(); if (get_thread_wsaved() || (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || (!__access_ok(ucp, sizeof(*ucp)))) goto do_sigsegv; grp = &ucp->uc_mcontext.mc_gregs; err = __get_user(pc, &((*grp)[MC_PC])); err |= __get_user(npc, &((*grp)[MC_NPC])); if (err || ((pc | npc) & 3)) goto do_sigsegv; if (regs->u_regs[UREG_I1]) { sigset_t set; if (_NSIG_WORDS == 1) { if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) goto do_sigsegv; } else { if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) goto do_sigsegv; } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); } if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; err |= __get_user(regs->y, &((*grp)[MC_Y])); err |= __get_user(tstate, &((*grp)[MC_TSTATE])); regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7])); err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); err |= __put_user(fp, (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); err |= __put_user(i7, (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); if (fenab) { unsigned long *fpregs = current_thread_info()->fpregs; unsigned long fprs; fprs_write(0); err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); if (fprs & FPRS_DL) err |= copy_from_user(fpregs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_from_user(fpregs+16, ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, (sizeof(unsigned int) * 32)); err |= __get_user(current_thread_info()->xfsr[0], &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); err |= __get_user(current_thread_info()->gsr[0], &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); regs->tstate &= ~TSTATE_PEF; } if (err) goto do_sigsegv; return; do_sigsegv: force_sig(SIGSEGV, current); } asmlinkage void sparc64_get_context(struct pt_regs *regs) { struct ucontext __user *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0]; mc_gregset_t __user *grp; mcontext_t __user *mcp; unsigned long fp, i7; unsigned char fenab; int err; synchronize_user_stack(); if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) goto do_sigsegv; #if 1 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ #else fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); #endif mcp = &ucp->uc_mcontext; grp = &mcp->mc_gregs; /* Skip over the trap instruction, first. */ if (test_thread_flag(TIF_32BIT)) { regs->tpc = (regs->tnpc & 0xffffffff); regs->tnpc = (regs->tnpc + 4) & 0xffffffff; } else { regs->tpc = regs->tnpc; regs->tnpc += 4; } err = 0; if (_NSIG_WORDS == 1) err |= __put_user(current->blocked.sig[0], (unsigned long __user *)&ucp->uc_sigmask); else err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, sizeof(sigset_t)); err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); err |= __put_user(regs->tpc, &((*grp)[MC_PC])); err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); err |= __put_user(regs->y, &((*grp)[MC_Y])); err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); err |= __get_user(fp, (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); err |= __get_user(i7, (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); err |= __put_user(fp, &(mcp->mc_fp)); err |= __put_user(i7, &(mcp->mc_i7)); err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); if (fenab) { unsigned long *fpregs = current_thread_info()->fpregs; unsigned long fprs; fprs = current_thread_info()->fpsaved[0]; if (fprs & FPRS_DL) err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_to_user( ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, (sizeof(unsigned int) * 32)); err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); } if (err) goto do_sigsegv; return; do_sigsegv: force_sig(SIGSEGV, current); } struct rt_signal_frame { struct sparc_stackf ss; siginfo_t info; struct pt_regs regs; __siginfo_fpu_t __user *fpu_save; stack_t stack; sigset_t mask; __siginfo_fpu_t fpu_state; }; /* Align macros */ #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) /* * atomically swap in the new signal mask, and wait for a signal. * This is really tricky on the Sparc, watch out... */ asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs) { sigset_t saveset; #ifdef CONFIG_SPARC32_COMPAT if (test_thread_flag(TIF_32BIT)) { extern asmlinkage void _sigpause32_common(compat_old_sigset_t, struct pt_regs *); _sigpause32_common(set, regs); return; } #endif set &= _BLOCKABLE; spin_lock_irq(¤t->sighand->siglock); saveset = current->blocked; siginitset(¤t->blocked, set); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); if (test_thread_flag(TIF_32BIT)) { regs->tpc = (regs->tnpc & 0xffffffff); regs->tnpc = (regs->tnpc + 4) & 0xffffffff; } else { regs->tpc = regs->tnpc; regs->tnpc += 4; } /* Condition codes and return value where set here for sigpause, * and so got used by setup_frame, which again causes sigreturn() * to return -EINTR. */ while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); /* * Return -EINTR and set condition code here, * so the interrupted system call actually returns * these. */ regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); regs->u_regs[UREG_I0] = EINTR; if (do_signal(&saveset, regs, 0, 0)) return; } } asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) { _sigpause_common(set, regs); } asmlinkage void do_sigsuspend(struct pt_regs *regs) { _sigpause_common(regs->u_regs[UREG_I0], regs); } asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs) { sigset_t oldset, set; /* XXX: Don't preclude handling different sized sigset_t's. */ if (sigsetsize != sizeof(sigset_t)) { regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); regs->u_regs[UREG_I0] = EINVAL; return; } if (copy_from_user(&set, uset, sizeof(set))) { regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); regs->u_regs[UREG_I0] = EFAULT; return; } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); oldset = current->blocked; current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); if (test_thread_flag(TIF_32BIT)) { regs->tpc = (regs->tnpc & 0xffffffff); regs->tnpc = (regs->tnpc + 4) & 0xffffffff; } else { regs->tpc = regs->tnpc; regs->tnpc += 4; } /* Condition codes and return value where set here for sigpause, * and so got used by setup_frame, which again causes sigreturn() * to return -EINTR. */ while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); /* * Return -EINTR and set condition code here, * so the interrupted system call actually returns * these. */ regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); regs->u_regs[UREG_I0] = EINTR; if (do_signal(&oldset, regs, 0, 0)) return; } } static inline int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { unsigned long *fpregs = current_thread_info()->fpregs; unsigned long fprs; int err; err = __get_user(fprs, &fpu->si_fprs); fprs_write(0); regs->tstate &= ~TSTATE_PEF; if (fprs & FPRS_DL) err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32)); err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); current_thread_info()->fpsaved[0] |= fprs; return err; } void do_rt_sigreturn(struct pt_regs *regs) { struct rt_signal_frame __user *sf; unsigned long tpc, tnpc, tstate; __siginfo_fpu_t __user *fpu_save; mm_segment_t old_fs; sigset_t set; stack_t st; int err; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; synchronize_user_stack (); sf = (struct rt_signal_frame __user *) (regs->u_regs [UREG_FP] + STACK_BIAS); /* 1. Make sure we are not getting garbage from the user */ if (((unsigned long) sf) & 3) goto segv; err = get_user(tpc, &sf->regs.tpc); err |= __get_user(tnpc, &sf->regs.tnpc); if (test_thread_flag(TIF_32BIT)) { tpc &= 0xffffffff; tnpc &= 0xffffffff; } err |= ((tpc | tnpc) & 3); /* 2. Restore the state */ err |= __get_user(regs->y, &sf->regs.y); err |= __get_user(tstate, &sf->regs.tstate); err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); /* User can only change condition codes and %asi in %tstate. */ regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); err |= __get_user(fpu_save, &sf->fpu_save); if (fpu_save) err |= restore_fpu_state(regs, &sf->fpu_state); err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); if (err) goto segv; regs->tpc = tpc; regs->tnpc = tnpc; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ old_fs = get_fs(); set_fs(KERNEL_DS); do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); set_fs(old_fs); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; 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, int fplen) { if (((unsigned long) fp) & 7) return 1; return 0; } static inline int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { unsigned long *fpregs = (unsigned long *)(regs+1); unsigned long fprs; int err = 0; fprs = current_thread_info()->fpsaved[0]; if (fprs & FPRS_DL) err |= copy_to_user(&fpu->si_float_regs[0], fpregs, (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, (sizeof(unsigned int) * 32)); err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); err |= __put_user(fprs, &fpu->si_fprs); return err; } static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) { unsigned long sp; sp = regs->u_regs[UREG_FP] + STACK_BIAS; /* This is the X/Open sanctioned signal stack switching. */ if (ka->sa.sa_flags & SA_ONSTACK) { if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) sp = current->sas_ss_sp + current->sas_ss_size; } return (void __user *)(sp - framesize); } static inline void 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 = RT_ALIGNEDSZ; 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 int do_signal(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) { siginfo_t info; struct signal_deliver_cookie cookie; struct k_sigaction ka; int signr; cookie.restart_syscall = restart_syscall; cookie.orig_i0 = orig_i0; if (!oldset) oldset = ¤t->blocked; #ifdef CONFIG_SPARC32_COMPAT if (test_thread_flag(TIF_32BIT)) { extern int do_signal32(sigset_t *, struct pt_regs *, unsigned long, int); return do_signal32(oldset, regs, orig_i0, cookie.restart_syscall); } #endif signr = get_signal_to_deliver(&info, &ka, regs, &cookie); if (signr > 0) { if (cookie.restart_syscall) syscall_restart(orig_i0, regs, &ka.sa); handle_signal(signr, &ka, &info, oldset, regs); return 1; } 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; } return 0; } void do_notify_resume(sigset_t *oldset, struct pt_regs *regs, unsigned long orig_i0, int restart_syscall, unsigned long thread_info_flags) { if (thread_info_flags & _TIF_SIGPENDING) do_signal(oldset, regs, orig_i0, restart_syscall); } 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; } }