/* $Id: signal.c,v 1.49 2000/04/08 02:11:46 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr, int options, unsigned long *ru); asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_o0, int ret_from_syscall); /* This turned off for production... */ /* #define DEBUG_SIGNALS 1 */ /* #define DEBUG_SIGNALS_TRACE 1 */ /* #define DEBUG_SIGNALS_MAPS 1 */ int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from) { if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t))) return -EFAULT; if (from->si_code < 0) return __copy_to_user(to, from, sizeof(siginfo_t)); else { int err; /* If you change siginfo_t structure, please be sure this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. */ err = __put_user(*(long *)&from->si_signo, (long *)&to->si_signo); err |= __put_user((short)from->si_code, &to->si_code); switch (from->si_code >> 16) { case __SI_CHLD >> 16: err |= __put_user(from->si_utime, &to->si_utime); err |= __put_user(from->si_stime, &to->si_stime); case __SI_FAULT >> 16: case __SI_POLL >> 16: err |= __put_user(from->si_trapno, &to->si_trapno); default: err |= __put_user(from->si_addr, &to->si_addr); break; /* case __SI_RT: This is not generated by the kernel as of now. */ } return err; } } /* {set, get}context() needed for 64-bit SparcLinux userland. */ asmlinkage void sparc64_set_context(struct pt_regs *regs) { struct ucontext *ucp = (struct ucontext *) regs->u_regs[UREG_I0]; struct thread_struct *tp = ¤t->thread; mc_gregset_t *grp; unsigned long pc, npc, tstate; unsigned long fp, i7; unsigned char fenab; int err; flush_user_windows(); if(tp->w_saved || (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || (!__access_ok((unsigned long)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->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); } regs->tpc = pc; regs->tnpc = npc; err |= __get_user(regs->y, &((*grp)[MC_Y])); err |= __get_user(tstate, &((*grp)[MC_TSTATE])); regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); regs->tstate |= (tstate & (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 *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); err |= __put_user(i7, (&(((struct reg_window *)(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 = (unsigned long *)(((char *)current) + AOFF_task_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 *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, (sizeof(unsigned int) * 32)); err |= __get_user(current->thread.xfsr[0], &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); err |= __get_user(current->thread.gsr[0], &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); regs->tstate &= ~TSTATE_PEF; } if (err) goto do_sigsegv; return; do_sigsegv: lock_kernel(); do_exit(SIGSEGV); } asmlinkage void sparc64_get_context(struct pt_regs *regs) { struct ucontext *ucp = (struct ucontext *) regs->u_regs[UREG_I0]; struct thread_struct *tp = ¤t->thread; mc_gregset_t *grp; mcontext_t *mcp; unsigned long fp, i7; unsigned char fenab; int err; synchronize_user_stack(); if(tp->w_saved || 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.fpsaved[0] & FPRS_FEF); #endif mcp = &ucp->uc_mcontext; grp = &mcp->mc_gregs; /* Skip over the trap instruction, first. */ regs->tpc = regs->tnpc; regs->tnpc += 4; err = 0; if (_NSIG_WORDS == 1) err |= __put_user(current->blocked.sig[0], (unsigned long *)&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_G6], &((*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 *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); err |= __get_user(i7, (&(((struct reg_window *)(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 = (unsigned long *)(((char *)current) + AOFF_task_fpregs); unsigned long fprs; fprs = current->thread.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 *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, (sizeof(unsigned int) * 32)); err |= __put_user(current->thread.xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); err |= __put_user(current->thread.gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); } if (err) goto do_sigsegv; return; do_sigsegv: lock_kernel(); do_exit(SIGSEGV); } struct rt_signal_frame { struct sparc_stackf ss; siginfo_t info; struct pt_regs regs; __siginfo_fpu_t * 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 (current->thread.flags & SPARC_FLAG_32BIT) { extern asmlinkage void _sigpause32_common(old_sigset_t32, struct pt_regs *); _sigpause32_common(set, regs); return; } #endif set &= _BLOCKABLE; spin_lock_irq(¤t->sigmask_lock); saveset = current->blocked; siginitset(¤t->blocked, set); recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); 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 *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->sigmask_lock); oldset = current->blocked; current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); 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 *fpu) { unsigned long *fpregs = (unsigned long *)(((char *)current) + AOFF_task_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.xfsr[0], &fpu->si_fsr); err |= __get_user(current->thread.gsr[0], &fpu->si_gsr); current->thread.fpsaved[0] |= fprs; return err; } void do_rt_sigreturn(struct pt_regs *regs) { struct rt_signal_frame *sf; unsigned long tpc, tnpc, tstate; __siginfo_fpu_t *fpu_save; sigset_t set; stack_t st; int err; synchronize_user_stack (); sf = (struct rt_signal_frame *) (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); 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 in %tstate. */ regs->tstate &= ~(TSTATE_ICC); regs->tstate |= (tstate & TSTATE_ICC); 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. */ do_sigaltstack(&st, NULL, (unsigned long)sf); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); return; segv: send_sig(SIGSEGV, current, 1); } /* Checks if the fp is valid */ static int invalid_frame_pointer(void *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 *fpu) { unsigned long *fpregs = (unsigned long *)(regs+1); unsigned long fprs; int err = 0; fprs = current->thread.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.xfsr[0], &fpu->si_fsr); err |= __put_user(current->thread.gsr[0], &fpu->si_gsr); err |= __put_user(fprs, &fpu->si_fprs); return err; } static inline void *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 *)(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 *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.fpsaved[0] & FPRS_FEF)) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct rt_signal_frame *)get_sigframe(ka, regs, sigframe_size); if (invalid_frame_pointer (sf, sigframe_size)) goto sigill; if (current->thread.w_saved != 0) { #ifdef DEBUG_SIGNALS printk ("%s[%d]: Invalid user stack frame for " "signal delivery.\n", current->comm, current->pid); #endif goto sigill; } /* 2. Save the current process state */ err = copy_to_user(&sf->regs, regs, sizeof (*regs)); if (current->thread.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 *)sf, (u64 *)(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; /* 5. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); /* 4. return to kernel instructions */ regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; return; sigill: lock_kernel(); do_exit(SIGILL); sigsegv: lock_kernel(); do_exit(SIGSEGV); } 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); if(ka->sa.sa_flags & SA_ONESHOT) ka->sa.sa_handler = SIG_DFL; if(!(ka->sa.sa_flags & SA_NOMASK)) { spin_lock_irq(¤t->sigmask_lock); sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); sigaddset(¤t->blocked,signr); recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); } } static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, struct sigaction *sa) { switch(regs->u_regs[UREG_I0]) { 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; } } #ifdef DEBUG_SIGNALS_MAPS #define MAPS_LINE_FORMAT "%016lx-%016lx %s %016lx %s %lu " static inline void read_maps (void) { struct vm_area_struct * map, * next; char * buffer; ssize_t i; buffer = (char*)__get_free_page(GFP_KERNEL); if (!buffer) return; for (map = current->mm->mmap ; map ; map = next ) { /* produce the next line */ char *line; char str[5], *cp = str; int flags; kdev_t dev; unsigned long ino; /* * Get the next vma now (but it won't be used if we sleep). */ next = map->vm_next; flags = map->vm_flags; *cp++ = flags & VM_READ ? 'r' : '-'; *cp++ = flags & VM_WRITE ? 'w' : '-'; *cp++ = flags & VM_EXEC ? 'x' : '-'; *cp++ = flags & VM_MAYSHARE ? 's' : 'p'; *cp++ = 0; dev = 0; ino = 0; if (map->vm_file != NULL) { dev = map->vm_file->f_dentry->d_inode->i_dev; ino = map->vm_file->f_dentry->d_inode->i_ino; line = d_path(map->vm_file->f_dentry, map->vm_file->f_vfsmnt, buffer, PAGE_SIZE); } printk(MAPS_LINE_FORMAT, map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT, kdevname(dev), ino); if (map->vm_file != NULL) printk("%s\n", line); else printk("\n"); } free_page((unsigned long)buffer); return; } #endif /* 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. */ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) { unsigned long signr; siginfo_t info; struct k_sigaction *ka; if (!oldset) oldset = ¤t->blocked; #ifdef CONFIG_SPARC32_COMPAT if (current->thread.flags & SPARC_FLAG_32BIT) { extern asmlinkage int do_signal32(sigset_t *, struct pt_regs *, unsigned long, int); return do_signal32(oldset, regs, orig_i0, restart_syscall); } #endif for (;;) { spin_lock_irq(¤t->sigmask_lock); signr = dequeue_signal(¤t->blocked, &info); spin_unlock_irq(¤t->sigmask_lock); if (!signr) break; if ((current->flags & PF_PTRACED) && signr != SIGKILL) { current->exit_code = signr; current->state = TASK_STOPPED; notify_parent(current, SIGCHLD); schedule(); if (!(signr = current->exit_code)) continue; current->exit_code = 0; if (signr == SIGSTOP) continue; /* Update the siginfo structure. Is this good? */ if (signr != info.si_signo) { info.si_signo = signr; info.si_errno = 0; info.si_code = SI_USER; info.si_pid = current->p_pptr->pid; info.si_uid = current->p_pptr->uid; } /* If the (new) signal is now blocked, requeue it. */ if (sigismember(¤t->blocked, signr)) { send_sig_info(signr, &info, current); continue; } } ka = ¤t->sig->action[signr-1]; if(ka->sa.sa_handler == SIG_IGN) { if(signr != SIGCHLD) continue; /* sys_wait4() grabs the master kernel lock, so * we need not do so, that sucker should be * threaded and would not be that difficult to * do anyways. */ while(sys_wait4(-1, NULL, WNOHANG, NULL) > 0) ; continue; } if(ka->sa.sa_handler == SIG_DFL) { unsigned long exit_code = signr; if(current->pid == 1) continue; switch(signr) { case SIGCONT: case SIGCHLD: case SIGWINCH: continue; case SIGTSTP: case SIGTTIN: case SIGTTOU: if (is_orphaned_pgrp(current->pgrp)) continue; case SIGSTOP: if (current->flags & PF_PTRACED) continue; current->state = TASK_STOPPED; current->exit_code = signr; if(!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP)) notify_parent(current, SIGCHLD); schedule(); continue; case SIGQUIT: case SIGILL: case SIGTRAP: case SIGABRT: case SIGFPE: case SIGSEGV: case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ: if (do_coredump(signr, regs)) exit_code |= 0x80; #ifdef DEBUG_SIGNALS /* Very useful to debug the dynamic linker */ printk ("Sig %d going...\n", (int)signr); show_regs (regs); #ifdef DEBUG_SIGNALS_TRACE { struct reg_window *rw = (struct reg_window *)(regs->u_regs[UREG_FP] + STACK_BIAS); unsigned long ins[8]; while(rw && !(((unsigned long) rw) & 0x3)) { copy_from_user(ins, &rw->ins[0], sizeof(ins)); printk("Caller[%016lx](%016lx,%016lx,%016lx,%016lx,%016lx,%016lx)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]); rw = (struct reg_window *)(unsigned long)(ins[6] + STACK_BIAS); } } #endif #ifdef DEBUG_SIGNALS_MAPS printk("Maps:\n"); read_maps(); #endif #endif /* fall through */ default: lock_kernel(); sigaddset(¤t->signal, signr); recalc_sigpending(current); current->flags |= PF_SIGNALED; do_exit(exit_code); /* NOT REACHED */ } } if(restart_syscall) syscall_restart(orig_i0, regs, &ka->sa); handle_signal(signr, ka, &info, oldset, regs); return 1; } 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; } return 0; }