signal.c
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上传日期:2013-04-10
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文件大小:37k
- /* $Id: signal.c,v 1.108 2001/01/24 21:05:12 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/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 stackn",
- 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;
- regs->u_regs[UREG_I2] = (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->u_regs[UREG_I2] = (unsigned long) &sf->regs;
- 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 framen");
- #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 %xn", (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("%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;
- 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) {
- /* 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->pc -= 4;
- regs->npc -= 4;
- restart_syscall = 0;
- }
- 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:
- sigaddset(¤t->pending.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, 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;
- }