| /* $Id: signal.c,v 1.110 2002-02-08 03:57:14 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 <linux/config.h> |
| #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.h> |
| #include <linux/smp_lock.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/bitops.h> |
| #include <asm/ptrace.h> |
| #include <asm/svr4.h> |
| #include <asm/pgalloc.h> |
| #include <asm/pgtable.h> |
| |
| #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| |
| 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(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 */ |
| |
| /* 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; |
| unsigned int extramask[_NSIG_WORDS - 1]; |
| }; |
| |
| /* |
| * 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))); |
| unsigned int extramask[_NSIG_WORDS - 1]; |
| unsigned int extra_size; /* Should be 0 */ |
| __siginfo_fpu_t fpu_state; |
| }; |
| |
| struct rt_signal_frame { |
| struct sparc_stackf ss; |
| siginfo_t info; |
| struct pt_regs regs; |
| sigset_t mask; |
| __siginfo_fpu_t *fpu_save; |
| unsigned int insns [2]; |
| stack_t stack; |
| unsigned int extra_size; /* Should be 0 */ |
| __siginfo_fpu_t fpu_state; |
| }; |
| |
| 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(from->si_signo, &to->si_signo); |
| err |= __put_user(from->si_errno, &to->si_errno); |
| 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_RT: This is not generated by the kernel as of now. */ |
| err |= __put_user(from->si_status, &to->si_status); |
| default: |
| err |= __put_user(from->si_uid, &to->si_uid); |
| err |= __put_user(from->si_pid, &to->si_pid); |
| break; |
| } |
| return err; |
| } |
| } |
| |
| /* Align macros */ |
| #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) |
| #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7))) |
| #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; |
| |
| 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->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(&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->psr |= PSR_C; |
| regs->u_regs[UREG_I0] = EINVAL; |
| return; |
| } |
| |
| if (copy_from_user(&set, uset, sizeof(set))) { |
| regs->psr |= PSR_C; |
| 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->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(&oldset, regs, 0, 0)) |
| return; |
| } |
| } |
| |
| static inline int |
| restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) |
| { |
| int err; |
| #ifdef CONFIG_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; |
| |
| if (verify_area (VERIFY_READ, fpu, sizeof(*fpu))) |
| return -EFAULT; |
| |
| err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], |
| (sizeof(unsigned long) * 32)); |
| err |= __get_user(current->thread.fsr, &fpu->si_fsr); |
| err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); |
| if (current->thread.fpqdepth != 0) |
| err |= __copy_from_user(¤t->thread.fpqueue[0], |
| &fpu->si_fpqueue[0], |
| ((sizeof(unsigned long) + |
| (sizeof(unsigned long *)))*16)); |
| return err; |
| } |
| |
| static inline void do_new_sigreturn (struct pt_regs *regs) |
| { |
| struct new_signal_frame *sf; |
| unsigned long up_psr, pc, npc; |
| sigset_t set; |
| __siginfo_fpu_t *fpu_save; |
| int err; |
| |
| 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; |
| |
| err = __get_user(pc, &sf->info.si_regs.pc); |
| err |= __get_user(npc, &sf->info.si_regs.npc); |
| |
| if ((pc | npc) & 3) |
| goto segv_and_exit; |
| |
| /* 2. Restore the state */ |
| up_psr = regs->psr; |
| err |= __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)); |
| |
| err |= __get_user(fpu_save, &sf->fpu_save); |
| |
| if (fpu_save) |
| err |= restore_fpu_state(regs, fpu_save); |
| |
| /* This is pretty much atomic, no amount locking would prevent |
| * the races which exist anyways. |
| */ |
| err |= __get_user(set.sig[0], &sf->info.si_mask); |
| err |= __copy_from_user(&set.sig[1], &sf->extramask, |
| (_NSIG_WORDS-1) * sizeof(unsigned int)); |
| |
| if (err) |
| goto segv_and_exit; |
| |
| sigdelsetmask(&set, ~_BLOCKABLE); |
| spin_lock_irq(¤t->sigmask_lock); |
| current->blocked = set; |
| recalc_sigpending(current); |
| spin_unlock_irq(¤t->sigmask_lock); |
| return; |
| |
| segv_and_exit: |
| do_exit(SIGSEGV); |
| } |
| |
| asmlinkage void do_sigreturn(struct pt_regs *regs) |
| { |
| struct sigcontext *scptr; |
| unsigned long pc, npc, psr; |
| sigset_t set; |
| int err; |
| |
| synchronize_user_stack(); |
| |
| if (current->thread.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; |
| |
| err = __get_user(pc, &scptr->sigc_pc); |
| err |= __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. |
| */ |
| err |= __get_user(set.sig[0], &scptr->sigc_mask); |
| /* Note that scptr + 1 points to extramask */ |
| err |= __copy_from_user(&set.sig[1], scptr + 1, |
| (_NSIG_WORDS - 1) * sizeof(unsigned int)); |
| |
| if (err) |
| goto segv_and_exit; |
| |
| sigdelsetmask(&set, ~_BLOCKABLE); |
| spin_lock_irq(¤t->sigmask_lock); |
| current->blocked = set; |
| recalc_sigpending(current); |
| spin_unlock_irq(¤t->sigmask_lock); |
| |
| regs->pc = pc; |
| regs->npc = npc; |
| |
| err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); |
| err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); |
| err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); |
| |
| /* User can only change condition codes in %psr. */ |
| err |= __get_user(psr, &scptr->sigc_psr); |
| if (err) |
| goto segv_and_exit; |
| |
| regs->psr &= ~(PSR_ICC); |
| regs->psr |= (psr & PSR_ICC); |
| return; |
| |
| segv_and_exit: |
| send_sig(SIGSEGV, current, 1); |
| } |
| |
| asmlinkage void do_rt_sigreturn(struct pt_regs *regs) |
| { |
| struct rt_signal_frame *sf; |
| unsigned int psr, pc, npc; |
| __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]; |
| if(verify_area(VERIFY_READ, sf, sizeof(*sf)) || |
| (((unsigned long) sf) & 0x03)) |
| goto segv; |
| |
| err = __get_user(pc, &sf->regs.pc); |
| err |= __get_user(npc, &sf->regs.npc); |
| err |= ((pc | npc) & 0x03); |
| |
| err |= __get_user(regs->y, &sf->regs.y); |
| err |= __get_user(psr, &sf->regs.psr); |
| |
| err |= __copy_from_user(®s->u_regs[UREG_G1], &sf->regs.u_regs[UREG_G1], 15*sizeof(u32)); |
| |
| regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); |
| |
| err |= __get_user(fpu_save, &sf->fpu_save); |
| |
| if(fpu_save) |
| err |= restore_fpu_state(regs, fpu_save); |
| 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->pc = pc; |
| regs->npc = npc; |
| |
| /* 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 inline 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 inline void *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) |
| { |
| unsigned long sp; |
| |
| sp = regs->u_regs[UREG_FP]; |
| |
| /* This is the X/Open sanctioned signal stack switching. */ |
| if (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_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) |
| { |
| struct signal_sframe *sframep; |
| struct sigcontext *sc; |
| int window = 0, err; |
| unsigned long pc = regs->pc; |
| unsigned long npc = regs->npc; |
| void *sig_address; |
| int sig_code; |
| |
| synchronize_user_stack(); |
| sframep = (struct signal_sframe *)get_sigframe(sa, regs, 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... */ |
| err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), |
| &sc->sigc_onstack); |
| err |= __put_user(oldset->sig[0], &sc->sigc_mask); |
| err |= __copy_to_user(sframep->extramask, &oldset->sig[1], |
| (_NSIG_WORDS - 1) * sizeof(unsigned int)); |
| err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); |
| err |= __put_user(pc, &sc->sigc_pc); |
| err |= __put_user(npc, &sc->sigc_npc); |
| err |= __put_user(regs->psr, &sc->sigc_psr); |
| err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); |
| err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); |
| err |= __put_user(current->thread.w_saved, &sc->sigc_oswins); |
| if(current->thread.w_saved) |
| for(window = 0; window < current->thread.w_saved; window++) { |
| sc->sigc_spbuf[window] = |
| (char *)current->thread.rwbuf_stkptrs[window]; |
| err |= __copy_to_user(&sc->sigc_wbuf[window], |
| ¤t->thread.reg_window[window], |
| sizeof(struct reg_window)); |
| } |
| else |
| err |= __copy_to_user(sframep, (char *)regs->u_regs[UREG_FP], |
| sizeof(struct reg_window)); |
| |
| current->thread.w_saved = 0; /* So process is allowed to execute. */ |
| |
| err |= __put_user(signr, &sframep->sig_num); |
| sig_address = NULL; |
| sig_code = 0; |
| if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { |
| sig_address = info->si_addr; |
| switch (signr) { |
| case SIGSEGV: |
| switch (info->si_code) { |
| case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; |
| default: sig_code = SUBSIG_PROTECTION; break; |
| } |
| break; |
| case SIGILL: |
| switch (info->si_code) { |
| case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; |
| case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; |
| case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP (info->si_trapno); break; |
| default: sig_code = SUBSIG_STACK; break; |
| } |
| break; |
| case SIGFPE: |
| switch (info->si_code) { |
| case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; |
| case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; |
| case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; |
| case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; |
| case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; |
| case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; |
| case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; |
| default: sig_code = SUBSIG_FPERROR; break; |
| } |
| break; |
| case SIGBUS: |
| switch (info->si_code) { |
| case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; |
| case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; |
| default: sig_code = SUBSIG_BUSTIMEOUT; break; |
| } |
| break; |
| case SIGEMT: |
| switch (info->si_code) { |
| case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; |
| } |
| break; |
| case SIGSYS: |
| if (info->si_code == (__SI_FAULT|0x100)) { |
| /* See sys_sunos.c */ |
| sig_code = info->si_trapno; |
| break; |
| } |
| default: |
| sig_address = NULL; |
| } |
| } |
| err |= __put_user((long)sig_address, &sframep->sig_address); |
| err |= __put_user(sig_code, &sframep->sig_code); |
| err |= __put_user(sc, &sframep->sig_scptr); |
| if (err) |
| goto sigsegv; |
| |
| regs->u_regs[UREG_FP] = (unsigned long) sframep; |
| regs->pc = (unsigned long) sa->sa_handler; |
| regs->npc = (regs->pc + 4); |
| return; |
| |
| sigill_and_return: |
| do_exit(SIGILL); |
| sigsegv: |
| do_exit(SIGSEGV); |
| } |
| |
| |
| static inline int |
| save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) |
| { |
| int err = 0; |
| #ifdef CONFIG_SMP |
| if (current->flags & PF_USEDFPU) { |
| put_psr(get_psr() | PSR_EF); |
| fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, |
| ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); |
| regs->psr &= ~(PSR_EF); |
| current->flags &= ~(PF_USEDFPU); |
| } |
| #else |
| if (current == last_task_used_math) { |
| put_psr(get_psr() | PSR_EF); |
| fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, |
| ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); |
| last_task_used_math = 0; |
| regs->psr &= ~(PSR_EF); |
| } |
| #endif |
| err |= __copy_to_user(&fpu->si_float_regs[0], ¤t->thread.float_regs[0], |
| (sizeof(unsigned long) * 32)); |
| err |= __put_user(current->thread.fsr, &fpu->si_fsr); |
| err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); |
| if (current->thread.fpqdepth != 0) |
| err |= __copy_to_user(&fpu->si_fpqueue[0], ¤t->thread.fpqueue[0], |
| ((sizeof(unsigned long) + |
| (sizeof(unsigned long *)))*16)); |
| current->used_math = 0; |
| return err; |
| } |
| |
| static inline void |
| new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, |
| int signo, sigset_t *oldset) |
| { |
| struct new_signal_frame *sf; |
| int sigframe_size, err; |
| |
| /* 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 *)get_sigframe(&ka->sa, regs, sigframe_size); |
| |
| if (invalid_frame_pointer (sf, sigframe_size)) |
| goto sigill_and_return; |
| |
| 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_and_return; |
| } |
| |
| /* 2. Save the current process state */ |
| err = __copy_to_user(&sf->info.si_regs, regs, sizeof (struct pt_regs)); |
| |
| err |= __put_user(0, &sf->extra_size); |
| |
| if (current->used_math) { |
| err |= save_fpu_state(regs, &sf->fpu_state); |
| err |= __put_user(&sf->fpu_state, &sf->fpu_save); |
| } else { |
| err |= __put_user(0, &sf->fpu_save); |
| } |
| |
| err |= __put_user(oldset->sig[0], &sf->info.si_mask); |
| err |= __copy_to_user(sf->extramask, &oldset->sig[1], |
| (_NSIG_WORDS - 1) * sizeof(unsigned int)); |
| err |= __copy_to_user(sf, (char *) regs->u_regs [UREG_FP], |
| sizeof (struct reg_window)); |
| if (err) |
| goto sigsegv; |
| |
| /* 3. 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; |
| |
| /* 4. signal handler */ |
| regs->pc = (unsigned long) ka->sa.sa_handler; |
| regs->npc = (regs->pc + 4); |
| |
| /* 5. return to kernel instructions */ |
| if (ka->ka_restorer) |
| regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; |
| else { |
| regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); |
| |
| /* mov __NR_sigreturn, %g1 */ |
| err |= __put_user(0x821020d8, &sf->insns[0]); |
| |
| /* t 0x10 */ |
| err |= __put_user(0x91d02010, &sf->insns[1]); |
| if (err) |
| goto sigsegv; |
| |
| /* Flush instruction space. */ |
| flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); |
| } |
| return; |
| |
| sigill_and_return: |
| do_exit(SIGILL); |
| sigsegv: |
| do_exit(SIGSEGV); |
| } |
| |
| static inline void |
| new_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; |
| unsigned int psr; |
| int err; |
| |
| synchronize_user_stack(); |
| sigframe_size = RT_ALIGNEDSZ; |
| if(!current->used_math) |
| sigframe_size -= sizeof(__siginfo_fpu_t); |
| sf = (struct rt_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size); |
| if(invalid_frame_pointer(sf, sigframe_size)) |
| goto sigill; |
| if(current->thread.w_saved != 0) |
| goto sigill; |
| |
| err = __put_user(regs->pc, &sf->regs.pc); |
| err |= __put_user(regs->npc, &sf->regs.npc); |
| err |= __put_user(regs->y, &sf->regs.y); |
| psr = regs->psr; |
| if(current->used_math) |
| psr |= PSR_EF; |
| err |= __put_user(psr, &sf->regs.psr); |
| err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); |
| err |= __put_user(0, &sf->extra_size); |
| |
| if(psr & PSR_EF) { |
| err |= save_fpu_state(regs, &sf->fpu_state); |
| err |= __put_user(&sf->fpu_state, &sf->fpu_save); |
| } else { |
| err |= __put_user(0, &sf->fpu_save); |
| } |
| err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); |
| |
| /* 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, (char *) regs->u_regs [UREG_FP], |
| sizeof (struct reg_window)); |
| |
| err |= copy_siginfo_to_user(&sf->info, info); |
| |
| if (err) |
| goto sigsegv; |
| |
| regs->u_regs[UREG_FP] = (unsigned long) sf; |
| regs->u_regs[UREG_I0] = signo; |
| regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
| |
| regs->pc = (unsigned long) ka->sa.sa_handler; |
| regs->npc = (regs->pc + 4); |
| |
| if(ka->ka_restorer) |
| regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; |
| else { |
| regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); |
| |
| /* mov __NR_sigreturn, %g1 */ |
| err |= __put_user(0x821020d8, &sf->insns[0]); |
| |
| /* t 0x10 */ |
| err |= __put_user(0x91d02010, &sf->insns[1]); |
| if (err) |
| goto sigsegv; |
| |
| /* Flush instruction space. */ |
| flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); |
| } |
| return; |
| |
| sigill: |
| do_exit(SIGILL); |
| sigsegv: |
| do_exit(SIGSEGV); |
| } |
| |
| /* 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, sigset_t *oldset) |
| { |
| 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; |
| svr4_sigset_t setv; |
| int window = 0, err; |
| |
| synchronize_user_stack(); |
| sfp = (svr4_signal_frame_t *) get_sigframe(sa, regs, SVR4_SF_ALIGNED + REGWIN_SZ); |
| |
| 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 */ |
| err = __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. |
| */ |
| setv.sigbits[0] = oldset->sig[0]; |
| setv.sigbits[1] = oldset->sig[1]; |
| if (_NSIG_WORDS >= 4) { |
| setv.sigbits[2] = oldset->sig[2]; |
| setv.sigbits[3] = oldset->sig[3]; |
| err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); |
| } else |
| err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int)); |
| |
| /* Store registers */ |
| err |= __put_user(regs->pc, &((*gr) [SVR4_PC])); |
| err |= __put_user(regs->npc, &((*gr) [SVR4_NPC])); |
| err |= __put_user(regs->psr, &((*gr) [SVR4_PSR])); |
| err |= __put_user(regs->y, &((*gr) [SVR4_Y])); |
| |
| /* Copy g [1..7] and o [0..7] registers */ |
| err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (long) * 7); |
| err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (long) * 8); |
| |
| /* Setup sigaltstack */ |
| err |= __put_user(current->sas_ss_sp, &uc->stack.sp); |
| err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); |
| err |= __put_user(current->sas_ss_size, &uc->stack.size); |
| |
| /* Save the currently window file: */ |
| |
| /* 1. Link sfp->uc->gwins to our windows */ |
| err |= __put_user(gw, &mc->gwin); |
| |
| /* 2. Number of windows to restore at setcontext (): */ |
| err |= __put_user(current->thread.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->thread.w_saved; window++) { |
| err |= __put_user((int *) &(gw->win [window]), &gw->winptr [window]); |
| err |= __copy_to_user(&gw->win [window], |
| ¤t->thread.reg_window [window], |
| sizeof (svr4_rwindow_t)); |
| err |= __put_user(0, gw->winptr [window]); |
| } |
| |
| /* 4. We just pay attention to the gw->count field on setcontext */ |
| current->thread.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 siginfo. |
| */ |
| err |= __put_user(signr, &si->siginfo.signo); |
| err |= __put_user(SVR4_SINOINFO, &si->siginfo.code); |
| if (err) |
| goto sigsegv; |
| |
| 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]; |
| |
| err |= __put_user(signr, &rw->ins [0]); |
| err |= __put_user(si, &rw->ins [1]); |
| err |= __put_user(uc, &rw->ins [2]); |
| err |= __put_user(sfp, &rw->ins [6]); /* frame pointer */ |
| if (err) |
| goto sigsegv; |
| |
| regs->u_regs[UREG_I0] = signr; |
| regs->u_regs[UREG_I1] = (uint) si; |
| regs->u_regs[UREG_I2] = (uint) uc; |
| } |
| return; |
| |
| sigill_and_return: |
| do_exit(SIGILL); |
| sigsegv: |
| do_exit(SIGSEGV); |
| } |
| |
| asmlinkage int svr4_getcontext (svr4_ucontext_t *uc, struct pt_regs *regs) |
| { |
| svr4_gregset_t *gr; |
| svr4_mcontext_t *mc; |
| svr4_sigset_t setv; |
| int err = 0; |
| |
| synchronize_user_stack(); |
| |
| if (current->thread.w_saved) |
| goto sigsegv_and_return; |
| |
| err = clear_user(uc, sizeof (*uc)); |
| if (err) |
| return -EFAULT; |
| |
| /* Setup convenience variables */ |
| mc = &uc->mcontext; |
| gr = &mc->greg; |
| |
| setv.sigbits[0] = current->blocked.sig[0]; |
| setv.sigbits[1] = current->blocked.sig[1]; |
| if (_NSIG_WORDS >= 4) { |
| setv.sigbits[2] = current->blocked.sig[2]; |
| setv.sigbits[3] = current->blocked.sig[3]; |
| err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); |
| } else |
| err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int)); |
| |
| /* Store registers */ |
| err |= __put_user(regs->pc, &uc->mcontext.greg [SVR4_PC]); |
| err |= __put_user(regs->npc, &uc->mcontext.greg [SVR4_NPC]); |
| err |= __put_user(regs->psr, &uc->mcontext.greg [SVR4_PSR]); |
| err |= __put_user(regs->y, &uc->mcontext.greg [SVR4_Y]); |
| |
| /* Copy g [1..7] and o [0..7] registers */ |
| err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (uint) * 7); |
| err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (uint) * 8); |
| |
| /* Setup sigaltstack */ |
| err |= __put_user(current->sas_ss_sp, &uc->stack.sp); |
| err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); |
| err |= __put_user(current->sas_ss_size, &uc->stack.size); |
| |
| /* The register file is not saved |
| * we have already stuffed all of it with sync_user_stack |
| */ |
| return (err ? -EFAULT : 0); |
| |
| sigsegv_and_return: |
| do_exit(SIGSEGV); |
| } |
| |
| /* 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->thread; |
| svr4_gregset_t *gr; |
| unsigned long pc, npc, psr; |
| sigset_t set; |
| svr4_sigset_t setv; |
| int err; |
| stack_t st; |
| |
| /* 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; |
| err = __get_user(pc, &((*gr)[SVR4_PC])); |
| err |= __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. |
| */ |
| err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); |
| |
| err |= __get_user(st.ss_sp, &c->stack.sp); |
| err |= __get_user(st.ss_flags, &c->stack.flags); |
| err |= __get_user(st.ss_size, &c->stack.size); |
| |
| if (err) |
| goto sigsegv_and_return; |
| |
| /* It is more difficult to avoid calling this function than to |
| call it and ignore errors. */ |
| do_sigaltstack(&st, NULL, regs->u_regs[UREG_I6]); |
| |
| set.sig[0] = setv.sigbits[0]; |
| set.sig[1] = setv.sigbits[1]; |
| if (_NSIG_WORDS >= 4) { |
| set.sig[2] = setv.sigbits[2]; |
| set.sig[3] = setv.sigbits[3]; |
| } |
| sigdelsetmask(&set, ~_BLOCKABLE); |
| spin_lock_irq(¤t->sigmask_lock); |
| current->blocked = set; |
| recalc_sigpending(current); |
| spin_unlock_irq(¤t->sigmask_lock); |
| regs->pc = pc; |
| regs->npc = npc | 1; |
| err |= __get_user(regs->y, &((*gr) [SVR4_Y])); |
| err |= __get_user(psr, &((*gr) [SVR4_PSR])); |
| regs->psr &= ~(PSR_ICC); |
| regs->psr |= (psr & PSR_ICC); |
| |
| /* Restore g[1..7] and o[0..7] registers */ |
| err |= __copy_from_user(®s->u_regs [UREG_G1], &(*gr)[SVR4_G1], |
| sizeof (long) * 7); |
| err |= __copy_from_user(®s->u_regs [UREG_I0], &(*gr)[SVR4_O0], |
| sizeof (long) * 8); |
| return (err ? -EFAULT : 0); |
| |
| sigsegv_and_return: |
| 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, |
| int svr4_signal) |
| { |
| if (svr4_signal) |
| setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); |
| else { |
| if (ka->sa.sa_flags & SA_SIGINFO) |
| new_setup_rt_frame(ka, regs, signr, oldset, info); |
| else if (current->thread.new_signal) |
| new_setup_frame (ka, regs, signr, oldset); |
| else |
| setup_frame(&ka->sa, regs, signr, oldset, info); |
| } |
| 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->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; |
| } |
| } |
| |
| #ifdef DEBUG_SIGNALS_MAPS |
| |
| #define MAPS_LINE_FORMAT "%08lx-%08lx %s %08lx %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; |
| struct k_sigaction *ka; |
| siginfo_t info; |
| |
| /* |
| * XXX Disable svr4 signal handling until solaris emulation works. |
| * It is buggy - Anton |
| */ |
| #define SVR4_SIGNAL_BROKEN 1 |
| #ifdef SVR4_SIGNAL_BROKEN |
| int svr4_signal = 0; |
| #else |
| int svr4_signal = current->personality == PER_SVR4; |
| #endif |
| |
| if (!oldset) |
| oldset = ¤t->blocked; |
| |
| for (;;) { |
| spin_lock_irq(¤t->sigmask_lock); |
| signr = dequeue_signal(¤t->blocked, &info); |
| spin_unlock_irq(¤t->sigmask_lock); |
| |
| if (!signr) break; |
| |
| if ((current->ptrace & PT_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; |
| |
| /* 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: |
| /* The operations performed by |
| * is_orphaned_pgrp() are protected by |
| * the tasklist_lock. |
| */ |
| if (is_orphaned_pgrp(current->pgrp)) |
| continue; |
| |
| case SIGSTOP: |
| if (current->ptrace & PT_PTRACED) |
| continue; |
| current->state = TASK_STOPPED; |
| current->exit_code = signr; |
| |
| /* notify_parent() is SMP safe */ |
| 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 dynamic linker problems */ |
| printk ("Sig %ld going for %s[%d]...\n", signr, current->comm, current->pid); |
| show_regs (regs); |
| #ifdef DEBUG_SIGNALS_TRACE |
| { |
| struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP]; |
| unsigned int ins[8]; |
| |
| while(rw && |
| !(((unsigned long) rw) & 0x3)) { |
| copy_from_user(ins, &rw->ins[0], sizeof(ins)); |
| printk("Caller[%08x](%08x,%08x,%08x,%08x,%08x,%08x)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]); |
| rw = (struct reg_window *)(unsigned long)ins[6]; |
| } |
| } |
| #endif |
| #ifdef DEBUG_SIGNALS_MAPS |
| printk("Maps:\n"); |
| read_maps(); |
| #endif |
| #endif |
| /* fall through */ |
| default: |
| sig_exit(signr, exit_code, &info); |
| /* NOT REACHED */ |
| } |
| } |
| if(restart_syscall) |
| syscall_restart(orig_i0, regs, &ka->sa); |
| handle_signal(signr, ka, &info, oldset, 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 |
| do_sys_sigstack(struct sigstack *ssptr, struct sigstack *ossptr, unsigned long sp) |
| { |
| int ret = -EFAULT; |
| |
| /* First see if old state is wanted. */ |
| if (ossptr) { |
| if (put_user(current->sas_ss_sp + current->sas_ss_size, &ossptr->the_stack) || |
| __put_user(on_sig_stack(sp), &ossptr->cur_status)) |
| goto out; |
| } |
| |
| /* Now see if we want to update the new state. */ |
| if (ssptr) { |
| void *ss_sp; |
| |
| if (get_user((long)ss_sp, &ssptr->the_stack)) |
| goto out; |
| /* If the current stack was set with sigaltstack, don't |
| swap stacks while we are on it. */ |
| ret = -EPERM; |
| if (current->sas_ss_sp && on_sig_stack(sp)) |
| goto out; |
| |
| /* Since we don't know the extent of the stack, and we don't |
| track onstack-ness, but rather calculate it, we must |
| presume a size. Ho hum this interface is lossy. */ |
| current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; |
| current->sas_ss_size = SIGSTKSZ; |
| } |
| ret = 0; |
| out: |
| return ret; |
| } |