/* $Id: signal.c,v 1.75 1997/08/05 19:19:26 davem Exp $ * linux/arch/sparc/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) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _S(nr) (1<<((nr)-1)) #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP))) asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr, int options, unsigned long *ru); extern void fpsave(unsigned long *fpregs, unsigned long *fsr, void *fpqueue, unsigned long *fpqdepth); extern void fpload(unsigned long *fpregs, unsigned long *fsr); asmlinkage int do_signal(unsigned long oldmask, struct pt_regs * regs, unsigned long orig_o0, int ret_from_syscall); /* This turned off for production... */ /* #define DEBUG_SIGNALS 1 */ /* Signal frames: the original one (compatible with SunOS): * * Set up a signal frame... Make the stack look the way SunOS * expects it to look which is basically: * * ---------------------------------- <-- %sp at signal time * Struct sigcontext * Signal address * Ptr to sigcontext area above * Signal code * The signal number itself * One register window * ---------------------------------- <-- New %sp */ struct signal_sframe { struct reg_window sig_window; int sig_num; int sig_code; struct sigcontext *sig_scptr; int sig_address; struct sigcontext sig_context; }; /* * And the new one, intended to be used for Linux applications only * (we have enough in there to work with clone). * All the interesting bits are in the info field. */ struct new_signal_frame { struct sparc_stackf ss; __siginfo_t info; __siginfo_fpu_t *fpu_save; unsigned long insns [2] __attribute__ ((aligned (8))); __siginfo_fpu_t fpu_state; }; /* Align macros */ #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) #define NF_ALIGNEDSZ (((sizeof(struct new_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(unsigned int set, struct pt_regs *regs) { unsigned long mask; spin_lock_irq(¤t->sigmask_lock); mask = current->blocked; current->blocked = set & _BLOCKABLE; spin_unlock_irq(¤t->sigmask_lock); regs->pc = regs->npc; regs->npc += 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->psr |= PSR_C; regs->u_regs[UREG_I0] = EINTR; if (do_signal(mask, 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); } static inline void restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) { #ifdef __SMP__ if (current->flags & PF_USEDFPU) regs->psr &= ~PSR_EF; #else if (current == last_task_used_math) { last_task_used_math = 0; regs->psr &= ~PSR_EF; } #endif current->used_math = 1; current->flags &= ~PF_USEDFPU; copy_from_user(¤t->tss.float_regs[0], &fpu->si_float_regs[0], (sizeof(unsigned long) * 32)); __get_user(current->tss.fsr, &fpu->si_fsr); __get_user(current->tss.fpqdepth, &fpu->si_fpqdepth); if (current->tss.fpqdepth != 0) copy_from_user(¤t->tss.fpqueue[0], &fpu->si_fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); } void do_new_sigreturn (struct pt_regs *regs) { struct new_signal_frame *sf; unsigned long up_psr, pc, npc, mask; sf = (struct new_signal_frame *) regs->u_regs [UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (verify_area (VERIFY_READ, sf, sizeof (*sf))) goto segv_and_exit; if (((uint) sf) & 3) goto segv_and_exit; __get_user(pc, &sf->info.si_regs.pc); __get_user(npc, &sf->info.si_regs.npc); if ((pc | npc) & 3) goto segv_and_exit; /* 2. Restore the state */ up_psr = regs->psr; copy_from_user(regs, &sf->info.si_regs, sizeof (struct pt_regs)); /* User can only change condition codes and FPU enabling in %psr. */ regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) | (regs->psr & (PSR_ICC | PSR_EF)); if (sf->fpu_save) restore_fpu_state(regs, sf->fpu_save); /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ __get_user(mask, &sf->info.si_mask); current->blocked = (mask & _BLOCKABLE); return; segv_and_exit: /* Ugh, we need to grab master lock in these rare cases ;-( */ lock_kernel(); do_exit(SIGSEGV); unlock_kernel(); } asmlinkage void do_sigreturn(struct pt_regs *regs) { struct sigcontext *scptr; unsigned long pc, npc, psr, mask; synchronize_user_stack(); if (current->tss.new_signal) return do_new_sigreturn (regs); scptr = (struct sigcontext *) regs->u_regs[UREG_I0]; /* Check sanity of the user arg. */ if(verify_area(VERIFY_READ, scptr, sizeof(struct sigcontext)) || (((unsigned long) scptr) & 3)) goto segv_and_exit; __get_user(pc, &scptr->sigc_pc); __get_user(npc, &scptr->sigc_npc); if((pc | npc) & 3) goto segv_and_exit; /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ __get_user(mask, &scptr->sigc_mask); current->blocked = (mask & _BLOCKABLE); __get_user(current->tss.sstk_info.cur_status, &scptr->sigc_onstack); current->tss.sstk_info.cur_status &= 1; regs->pc = pc; regs->npc = npc; __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); /* User can only change condition codes in %psr. */ __get_user(psr, &scptr->sigc_psr); regs->psr &= ~(PSR_ICC); regs->psr |= (psr & PSR_ICC); return; segv_and_exit: /* Ugh, we need to grab master lock in these rare cases ;-( */ lock_kernel(); do_exit(SIGSEGV); unlock_kernel(); } /* Checks if the fp is valid */ int invalid_frame_pointer (void *fp, int fplen) { if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen) || ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) return 1; return 0; } static void setup_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, struct pt_regs *regs, int signr, unsigned long oldmask) { struct signal_sframe *sframep; struct sigcontext *sc; int window = 0; int old_status = current->tss.sstk_info.cur_status; synchronize_user_stack(); sframep = (struct signal_sframe *) regs->u_regs[UREG_FP]; sframep = (struct signal_sframe *) (((unsigned long) sframep)-SF_ALIGNEDSZ); if (invalid_frame_pointer (sframep, sizeof(*sframep))){ #ifdef DEBUG_SIGNALS /* fills up the console logs during crashme runs, yuck... */ printk("%s [%d]: User has trashed signal stack\n", current->comm, current->pid); printk("Sigstack ptr %p handler at pc<%08lx> for sig<%d>\n", sframep, pc, signr); #endif /* Don't change signal code and address, so that * post mortem debuggers can have a look. */ goto sigill_and_return; } sc = &sframep->sig_context; /* We've already made sure frame pointer isn't in kernel space... */ __put_user(old_status, &sc->sigc_onstack); __put_user(oldmask, &sc->sigc_mask); __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); __put_user(pc, &sc->sigc_pc); __put_user(npc, &sc->sigc_npc); __put_user(regs->psr, &sc->sigc_psr); __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); __put_user(current->tss.w_saved, &sc->sigc_oswins); if(current->tss.w_saved) for(window = 0; window < current->tss.w_saved; window++) { sc->sigc_spbuf[window] = (char *)current->tss.rwbuf_stkptrs[window]; copy_to_user(&sc->sigc_wbuf[window], ¤t->tss.reg_window[window], sizeof(struct reg_window)); } else copy_to_user(sframep, (char *)regs->u_regs[UREG_FP], sizeof(struct reg_window)); current->tss.w_saved = 0; /* So process is allowed to execute. */ __put_user(signr, &sframep->sig_num); if(signr == SIGSEGV || signr == SIGILL || signr == SIGFPE || signr == SIGBUS || signr == SIGEMT) { __put_user(current->tss.sig_desc, &sframep->sig_code); __put_user(current->tss.sig_address, &sframep->sig_address); } else { __put_user(0, &sframep->sig_code); __put_user(0, &sframep->sig_address); } __put_user(sc, &sframep->sig_scptr); regs->u_regs[UREG_FP] = (unsigned long) sframep; regs->pc = (unsigned long) sa->sa_handler; regs->npc = (regs->pc + 4); return; sigill_and_return: /* Ugh, we need to grab master lock in these rare cases ;-( */ lock_kernel(); do_exit(SIGILL); unlock_kernel(); } static inline void save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) { #ifdef __SMP__ if (current->flags & PF_USEDFPU) { put_psr(get_psr() | PSR_EF); fpsave(¤t->tss.float_regs[0], ¤t->tss.fsr, ¤t->tss.fpqueue[0], ¤t->tss.fpqdepth); regs->psr &= ~(PSR_EF); current->flags &= ~(PF_USEDFPU); } #else if (current == last_task_used_math) { put_psr(get_psr() | PSR_EF); fpsave(¤t->tss.float_regs[0], ¤t->tss.fsr, ¤t->tss.fpqueue[0], ¤t->tss.fpqdepth); last_task_used_math = 0; regs->psr &= ~(PSR_EF); } #endif copy_to_user(&fpu->si_float_regs[0], ¤t->tss.float_regs[0], (sizeof(unsigned long) * 32)); __put_user(current->tss.fsr, &fpu->si_fsr); __put_user(current->tss.fpqdepth, &fpu->si_fpqdepth); if (current->tss.fpqdepth != 0) copy_to_user(&fpu->si_fpqueue[0], ¤t->tss.fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); current->used_math = 0; } static void new_setup_frame(struct sigaction *sa, struct pt_regs *regs, int signo, unsigned long oldmask) { struct new_signal_frame *sf; int sigframe_size; /* 1. Make sure everything is clean */ synchronize_user_stack(); sigframe_size = NF_ALIGNEDSZ; if (!current->used_math) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct new_signal_frame *)(regs->u_regs[UREG_FP] - sigframe_size); if (invalid_frame_pointer (sf, sigframe_size)) goto sigill_and_return; if (current->tss.w_saved != 0) { printk ("%s [%d]: Invalid user stack frame for " "signal delivery.\n", current->comm, current->pid); goto sigill_and_return; } /* 2. Save the current process state */ copy_to_user(&sf->info.si_regs, regs, sizeof (struct pt_regs)); if (current->used_math) { save_fpu_state(regs, &sf->fpu_state); sf->fpu_save = &sf->fpu_state; } else { sf->fpu_save = NULL; } __put_user(oldmask, &sf->info.si_mask); copy_to_user(sf, (char *) regs->u_regs [UREG_FP], sizeof (struct reg_window)); /* 3. return to kernel instructions */ __put_user(0x821020d8, &sf->insns [0]); /* mov __NR_sigreturn, %g1 */ __put_user(0x91d02010, &sf->insns [1]); /* t 0x10 */ /* 4. signal handler back-trampoline and parameters */ regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signo; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); /* 5. signal handler */ regs->pc = (unsigned long) sa->sa_handler; regs->npc = (regs->pc + 4); /* Flush instruction space. */ flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); return; sigill_and_return: lock_kernel(); do_exit(SIGILL); unlock_kernel(); } /* Setup a Solaris stack frame */ static inline void setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, struct pt_regs *regs, int signr, unsigned long oldmask) { svr4_signal_frame_t *sfp; svr4_gregset_t *gr; svr4_siginfo_t *si; svr4_mcontext_t *mc; svr4_gwindows_t *gw; svr4_ucontext_t *uc; int window = 0; synchronize_user_stack(); sfp = (svr4_signal_frame_t *) regs->u_regs[UREG_FP] - REGWIN_SZ; sfp = (svr4_signal_frame_t *) (((unsigned long) sfp)-SVR4_SF_ALIGNED); if (invalid_frame_pointer (sfp, sizeof (*sfp))){ #ifdef DEBUG_SIGNALS printk ("Invalid stack frame\n"); #endif goto sigill_and_return; } /* Start with a clean frame pointer and fill it */ clear_user(sfp, sizeof (*sfp)); /* Setup convenience variables */ si = &sfp->si; uc = &sfp->uc; gw = &sfp->gw; mc = &uc->mcontext; gr = &mc->greg; /* FIXME: where am I supposed to put this? * sc->sigc_onstack = old_status; * anyways, it does not look like it is used for anything at all. */ __put_user(oldmask, &uc->sigmask.sigbits [0]); /* Store registers */ __put_user(regs->pc, &((*gr) [SVR4_PC])); __put_user(regs->npc, &((*gr) [SVR4_NPC])); __put_user(regs->psr, &((*gr) [SVR4_PSR])); __put_user(regs->y, &((*gr) [SVR4_Y])); /* Copy g [1..7] and o [0..7] registers */ copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (long) * 7); copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (long) * 8); /* Setup sigaltstack, FIXME */ __put_user(0xdeadbeef, &uc->stack.sp); __put_user(0, &uc->stack.size); __put_user(0, &uc->stack.flags); /* Possible: ONSTACK, DISABLE */ /* Save the currently window file: */ /* 1. Link sfp->uc->gwins to our windows */ __put_user(gw, &mc->gwin); /* 2. Number of windows to restore at setcontext (): */ __put_user(current->tss.w_saved, &gw->count); /* 3. Save each valid window * Currently, it makes a copy of the windows from the kernel copy. * David's code for SunOS, makes the copy but keeps the pointer to * the kernel. My version makes the pointer point to a userland * copy of those. Mhm, I wonder if I shouldn't just ignore those * on setcontext and use those that are on the kernel, the signal * handler should not be modyfing those, mhm. * * These windows are just used in case synchronize_user_stack failed * to flush the user windows. */ for(window = 0; window < current->tss.w_saved; window++) { __put_user((int *) &(gw->win [window]), &gw->winptr [window]); copy_to_user(&gw->win [window], ¤t->tss.reg_window [window], sizeof (svr4_rwindow_t)); __put_user(0, gw->winptr [window]); } /* 4. We just pay attention to the gw->count field on setcontext */ current->tss.w_saved = 0; /* So process is allowed to execute. */ /* Setup the signal information. Solaris expects a bunch of * information to be passed to the signal handler, we don't provide * that much currently, should use those that David already * is providing with tss.sig_desc */ __put_user(signr, &si->siginfo.signo); __put_user(SVR4_SINOINFO, &si->siginfo.code); regs->u_regs[UREG_FP] = (unsigned long) sfp; regs->pc = (unsigned long) sa->sa_handler; regs->npc = (regs->pc + 4); #ifdef DEBUG_SIGNALS printk ("Solaris-frame: %x %x\n", (int) regs->pc, (int) regs->npc); #endif /* Arguments passed to signal handler */ if (regs->u_regs [14]){ struct reg_window *rw = (struct reg_window *) regs->u_regs [14]; __put_user(signr, &rw->ins [0]); __put_user(si, &rw->ins [1]); __put_user(uc, &rw->ins [2]); __put_user(sfp, &rw->ins [6]); /* frame pointer */ regs->u_regs[UREG_I0] = signr; regs->u_regs[UREG_I1] = (uint) si; regs->u_regs[UREG_I2] = (uint) uc; } return; sigill_and_return: lock_kernel(); do_exit(SIGILL); unlock_kernel(); } asmlinkage int svr4_getcontext (svr4_ucontext_t *uc, struct pt_regs *regs) { svr4_gregset_t *gr; svr4_mcontext_t *mc; synchronize_user_stack(); if (current->tss.w_saved) goto sigsegv_and_return; if(clear_user(uc, sizeof (*uc))) return -EFAULT; /* Setup convenience variables */ mc = &uc->mcontext; gr = &mc->greg; /* We only have < 32 signals, fill the first slot only */ __put_user(current->blocked, &uc->sigmask.sigbits [0]); /* Store registers */ __put_user(regs->pc, &uc->mcontext.greg [SVR4_PC]); __put_user(regs->npc, &uc->mcontext.greg [SVR4_NPC]); __put_user(regs->psr, &uc->mcontext.greg [SVR4_PSR]); __put_user(regs->y, &uc->mcontext.greg [SVR4_Y]); /* Copy g [1..7] and o [0..7] registers */ copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (uint) * 7); copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (uint) * 8); /* Setup sigaltstack, FIXME */ __put_user(0xdeadbeef, &uc->stack.sp); __put_user(0, &uc->stack.size); __put_user(0, &uc->stack.flags); /* Possible: ONSTACK, DISABLE */ /* The register file is not saved * we have already stuffed all of it with sync_user_stack */ return 0; sigsegv_and_return: lock_kernel(); do_exit(SIGSEGV); unlock_kernel(); return -EFAULT; } /* Set the context for a svr4 application, this is Solaris way to sigreturn */ asmlinkage int svr4_setcontext (svr4_ucontext_t *c, struct pt_regs *regs) { struct thread_struct *tp = ¤t->tss; svr4_gregset_t *gr; unsigned long pc, npc, psr, mask; /* Fixme: restore windows, or is this already taken care of in * svr4_setup_frame when sync_user_windows is done? */ flush_user_windows(); if (tp->w_saved) goto sigsegv_and_return; if (((uint) c) & 3) goto sigsegv_and_return; if(!__access_ok((unsigned long)c, sizeof(*c))) goto sigsegv_and_return; /* Check for valid PC and nPC */ gr = &c->mcontext.greg; __get_user(pc, &((*gr)[SVR4_PC])); __get_user(npc, &((*gr)[SVR4_NPC])); if((pc | npc) & 3) goto sigsegv_and_return; /* Retrieve information from passed ucontext */ /* note that nPC is ored a 1, this is used to inform entry.S */ /* that we don't want it to mess with our PC and nPC */ /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ __get_user(mask, &c->sigmask.sigbits [0]); current->blocked = (mask & _BLOCKABLE); regs->pc = pc; regs->npc = npc | 1; __get_user(regs->y, &((*gr) [SVR4_Y])); __get_user(psr, &((*gr) [SVR4_PSR])); regs->psr &= ~(PSR_ICC); regs->psr |= (psr & PSR_ICC); /* Restore g[1..7] and o[0..7] registers */ copy_from_user(®s->u_regs [UREG_G1], &(*gr)[SVR4_G1], sizeof (long) * 7); copy_from_user(®s->u_regs [UREG_I0], &(*gr)[SVR4_O0], sizeof (long) * 8); return 0; sigsegv_and_return: lock_kernel(); do_exit(SIGSEGV); unlock_kernel(); return -EFAULT; } static inline void handle_signal(unsigned long signr, struct sigaction *sa, unsigned long oldmask, struct pt_regs *regs, int svr4_signal) { if(svr4_signal) setup_svr4_frame(sa, regs->pc, regs->npc, regs, signr, oldmask); else { if (current->tss.new_signal) new_setup_frame (sa, regs, signr, oldmask); else setup_frame(sa, regs->pc, regs->npc, regs, signr, oldmask); } if(sa->sa_flags & SA_ONESHOT) sa->sa_handler = NULL; if(!(sa->sa_flags & SA_NOMASK)) { spin_lock_irq(¤t->sigmask_lock); current->blocked |= (sa->sa_mask | _S(signr)) & _BLOCKABLE; 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->psr |= PSR_C; 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->pc -= 4; regs->npc -= 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. */ asmlinkage int do_signal(unsigned long oldmask, struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) { unsigned long signr, mask = ~current->blocked; struct sigaction *sa; int svr4_signal = current->personality == PER_SVR4; while ((signr = current->signal & mask) != 0) { signr = ffz(~signr); spin_lock_irq(¤t->sigmask_lock); current->signal &= ~(1 << signr); spin_unlock_irq(¤t->sigmask_lock); sa = current->sig->action + signr; signr++; if ((current->flags & PF_PTRACED) && signr != SIGKILL) { current->exit_code = signr; current->state = TASK_STOPPED; /* This happens to be SMP safe so no need to * grab master kernel lock even in this case. */ notify_parent(current, SIGCHLD); schedule(); if (!(signr = current->exit_code)) continue; current->exit_code = 0; if (signr == SIGSTOP) continue; if (_S(signr) & current->blocked) { spin_lock_irq(¤t->sigmask_lock); current->signal |= _S(signr); spin_unlock_irq(¤t->sigmask_lock); continue; } sa = current->sig->action + signr - 1; } if(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(sa->sa_handler == SIG_DFL) { if(current->pid == 1) continue; switch(signr) { case SIGCONT: case SIGCHLD: case SIGWINCH: continue; case SIGTSTP: case SIGTTIN: case SIGTTOU: /* The operations performed by is_orphaned_pgrp() * are protected by the tasklist_lock. */ if (is_orphaned_pgrp(current->pgrp)) continue; case SIGSTOP: if (current->flags & PF_PTRACED) continue; current->state = TASK_STOPPED; current->exit_code = signr; /* notify_parent() is SMP safe */ if(!(current->p_pptr->sig->action[SIGCHLD-1].sa_flags & SA_NOCLDSTOP)) notify_parent(current, SIGCHLD); schedule(); continue; case SIGQUIT: case SIGILL: case SIGTRAP: case SIGABRT: case SIGFPE: case SIGSEGV: case SIGBUS: if(current->binfmt && current->binfmt->core_dump) { lock_kernel(); if(current->binfmt->core_dump(signr, regs)) signr |= 0x80; unlock_kernel(); } #ifdef DEBUG_SIGNALS /* Very useful to debug dynamic linker problems */ printk ("Sig ILL going...\n"); show_regs (regs); #endif /* fall through */ default: spin_lock_irq(¤t->sigmask_lock); current->signal |= _S(signr & 0x7f); spin_unlock_irq(¤t->sigmask_lock); current->flags |= PF_SIGNALED; lock_kernel(); /* 8-( */ do_exit(signr); unlock_kernel(); } } if(restart_syscall) syscall_restart(orig_i0, regs, sa); handle_signal(signr, sa, oldmask, regs, svr4_signal); 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->pc -= 4; regs->npc -= 4; } return 0; } asmlinkage int sys_sigstack(struct sigstack *ssptr, struct sigstack *ossptr) { int ret = -EFAULT; lock_kernel(); /* First see if old state is wanted. */ if(ossptr) { if(copy_to_user(ossptr, ¤t->tss.sstk_info, sizeof(struct sigstack))) goto out; } /* Now see if we want to update the new state. */ if(ssptr) { if(copy_from_user(¤t->tss.sstk_info, ssptr, sizeof(struct sigstack))) goto out; } ret = 0; out: unlock_kernel(); return ret; }