signal.c
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上传日期:2013-04-10
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文件大小:25k
- /* $Id: signal.c,v 1.56 2001/03/21 11:46:20 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>
- #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/smp_lock.h>
- #include <asm/uaccess.h>
- #include <asm/bitops.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)))
- 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);
- }
- if ((tp->flags & SPARC_FLAG_32BIT) != 0) {
- 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_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:
- 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. */
- if ((tp->flags & SPARC_FLAG_32BIT) != 0) {
- 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 *)&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:
- 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);
-
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- 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 *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);
-
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- 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 *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;
- mm_segment_t old_fs;
- 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);
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- 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 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. */
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- do_sigaltstack(&st, NULL, (unsigned long)sf);
- set_fs(old_fs);
- 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;
- /* 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 ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- 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:
- 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("%sn", 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->ptrace & PT_PTRACED) && signr != SIGKILL) {
- /* Do the syscall restart before we let the debugger
- * look at the child registers.
- */
- if (restart_syscall &&
- (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
- regs->u_regs[UREG_I0] == ERESTARTSYS ||
- regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
- regs->u_regs[UREG_I0] = orig_i0;
- regs->tpc -= 4;
- regs->tnpc -= 4;
- restart_syscall = 0;
- }
- 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->ptrace & PT_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:
- 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);
- 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;
- }