diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips64/kernel/signal32.c | 701 |
1 files changed, 688 insertions, 13 deletions
diff --git a/arch/mips64/kernel/signal32.c b/arch/mips64/kernel/signal32.c index 29031a49a..6983cfdc2 100644 --- a/arch/mips64/kernel/signal32.c +++ b/arch/mips64/kernel/signal32.c @@ -1,13 +1,688 @@ -int do_signal32(void) {return 0;} -int sys32_sigaction(void) {return 0;} -int sys32_sigsuspend(void) {return 0;} -int sys32_sigpending(void) {return 0;} -int sys32_sigreturn(void) {return 0;} -int sys32_rt_sigreturn(void) {return 0;} -int sys32_rt_sigaction(void) {return 0;} -int sys32_rt_sigprocmask(void) {return 0;} -int sys32_rt_sigpending(void) {return 0;} -int sys32_rt_sigtimedwait(void) {return 0;} -int sys32_rt_sigqueueinfo(void) {return 0;} -int sys32_rt_sigsuspend(void) {return 0;} -int sys32_sigaltstack(void) {return 0;} +/* $Id$ + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 1994 - 1999 Ralf Baechle + * Copyright (C) 1999 Silicon Graphics, Inc. + */ +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.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 <asm/asm.h> +#include <asm/bitops.h> +#include <asm/pgalloc.h> +#include <asm/stackframe.h> +#include <asm/uaccess.h> +#include <asm/ucontext.h> + +#define DEBUG_SIG 0 + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +extern asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr, + int options, unsigned long *ru); +extern asmlinkage int do_signal32(sigset_t *oldset, struct pt_regs *regs); +extern asmlinkage int save_fp_context(struct sigcontext *sc); +extern asmlinkage int restore_fp_context(struct sigcontext *sc); + +/* 32-bit compatibility types */ + +#define _NSIG32 128 +#define _NSIG32_BPW 32 +#define _NSIG_WORDS (_NSIG / _NSIG_BPW) + +typedef struct { + unsigned int sig[_NSIG_WORDS]; +} sigset32_t; + +typedef unsigned int __sighandler32_t; +typedef void (*vfptr_t)(void); + +struct sigaction32 { + unsigned int sa_flags; + __sighandler32_t sa_handler; + sigset32_t sa_mask; + unsigned int sa_restorer; + int sa_resv[1]; /* reserved */ +}; + +/* IRIX compatible stack_t */ +typedef struct sigaltstack32 { + void *ss_sp; + size_t ss_size; + int ss_flags; +} stack32_t; + + +/* + * Atomically swap in the new signal mask, and wait for a signal. + */ +asmlinkage inline int +sys32_sigsuspend(abi64_no_regargs, struct pt_regs regs) +{ + sigset_t *uset, saveset, newset; + + save_static(®s); +printk("%s called.\n", __FUNCTION__); + uset = (sigset_t *) regs.regs[4]; + if (copy_from_user(&newset, uset, sizeof(sigset_t))) + return -EFAULT; + sigdelsetmask(&newset, ~_BLOCKABLE); + + spin_lock_irq(¤t->sigmask_lock); + saveset = current->blocked; + current->blocked = newset; + recalc_sigpending(current); + spin_unlock_irq(¤t->sigmask_lock); + + regs.regs[2] = EINTR; + regs.regs[7] = 1; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal32(&saveset, ®s)) + return -EINTR; + } +} + +asmlinkage int +sys32_rt_sigsuspend(abi64_no_regargs, struct pt_regs regs) +{ + sigset_t *unewset, saveset, newset; + size_t sigsetsize; + + save_static(®s); +printk("%s called.\n", __FUNCTION__); + + /* XXX Don't preclude handling different sized sigset_t's. */ + sigsetsize = regs.regs[5]; + if (sigsetsize != sizeof(sigset_t)) + return -EINVAL; + + unewset = (sigset_t *) regs.regs[4]; + if (copy_from_user(&newset, unewset, sizeof(newset))) + return -EFAULT; + sigdelsetmask(&newset, ~_BLOCKABLE); + + spin_lock_irq(¤t->sigmask_lock); + saveset = current->blocked; + current->blocked = newset; + recalc_sigpending(current); + spin_unlock_irq(¤t->sigmask_lock); + + regs.regs[2] = EINTR; + regs.regs[7] = 1; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal32(&saveset, ®s)) + return -EINTR; + } +} + +asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act, + struct sigaction32 *oact) +{ + struct k_sigaction new_ka, old_ka; + int ret; + int err = 0; + + if (act) { + old_sigset_t mask; + + if (!access_ok(VERIFY_READ, act, sizeof(*act))) + return -EFAULT; + err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); + err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); + err |= __get_user(mask, &act->sa_mask.sig[0]); + err |= __get_user(new_ka.sa.sa_restorer, &act->sa_restorer); + if (err) + return -EFAULT; + + siginitset(&new_ka.sa.sa_mask, mask); + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + + if (!ret && oact) { + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) + return -EFAULT; + err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); + err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); + err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); + err |= __put_user(0, &oact->sa_mask.sig[1]); + err |= __put_user(0, &oact->sa_mask.sig[2]); + err |= __put_user(0, &oact->sa_mask.sig[3]); + err |= __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer); + if (err) + return -EFAULT; + } + + return ret; +} + +asmlinkage int +sys32_sigaltstack(abi64_no_regargs, struct pt_regs regs) +{ + const stack_t *uss = (const stack_t *) regs.regs[4]; + stack_t *uoss = (stack_t *) regs.regs[5]; + unsigned long usp = regs.regs[29]; +printk("%s called.\n", __FUNCTION__); + + return do_sigaltstack(uss, uoss, usp); +} + +static asmlinkage int +restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc) +{ + int owned_fp; + int err = 0; + + err |= __get_user(regs->cp0_epc, &sc->sc_pc); + err |= __get_user(regs->hi, &sc->sc_mdhi); + err |= __get_user(regs->lo, &sc->sc_mdlo); + +#define restore_gp_reg(i) do { \ + err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); + restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); + restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); + restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); + restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); + restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); + restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); + restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); + restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); + restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); + restore_gp_reg(31); +#undef restore_gp_reg + + err |= __get_user(owned_fp, &sc->sc_ownedfp); + if (owned_fp) { + err |= restore_fp_context(sc); + last_task_used_math = current; + } + + return err; +} + +struct sigframe { + u32 sf_ass[4]; /* argument save space for o32 */ + u32 sf_code[2]; /* signal trampoline */ + struct sigcontext sf_sc; + sigset_t sf_mask; +}; + +struct rt_sigframe { + u32 rs_ass[4]; /* argument save space for o32 */ + u32 rs_code[2]; /* signal trampoline */ + struct siginfo rs_info; + struct ucontext rs_uc; +}; + +asmlinkage void +sys32_sigreturn(abi64_no_regargs, struct pt_regs regs) +{ + struct sigframe *frame; + sigset_t blocked; +printk("%s called.\n", __FUNCTION__); + + frame = (struct sigframe *) regs.regs[29]; + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) + goto badframe; + + sigdelsetmask(&blocked, ~_BLOCKABLE); + spin_lock_irq(¤t->sigmask_lock); + current->blocked = blocked; + recalc_sigpending(current); + spin_unlock_irq(¤t->sigmask_lock); + + if (restore_sigcontext(®s, &frame->sf_sc)) + goto badframe; + + /* + * Don't let your children do this ... + */ + __asm__ __volatile__( + "move\t$29, %0\n\t" + "j\tret_from_sys_call" + :/* no outputs */ + :"r" (®s)); + /* Unreached */ + +badframe: + force_sig(SIGSEGV, current); +} + +asmlinkage void +sys32_rt_sigreturn(abi64_no_regargs, struct pt_regs regs) +{ + struct rt_sigframe *frame; + sigset_t set; + stack_t st; +printk("%s called.\n", __FUNCTION__); + + frame = (struct rt_sigframe *) regs.regs[29]; + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sigmask_lock); + current->blocked = set; + recalc_sigpending(current); + spin_unlock_irq(¤t->sigmask_lock); + + if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) + goto badframe; + + if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) + goto badframe; + /* It is more difficult to avoid calling this function than to + call it and ignore errors. */ + do_sigaltstack(&st, NULL, regs.regs[29]); + + /* + * Don't let your children do this ... + */ + __asm__ __volatile__( + "move\t$29, %0\n\t" + "j\tret_from_sys_call" + :/* no outputs */ + :"r" (®s)); + /* Unreached */ + +badframe: + force_sig(SIGSEGV, current); +} + +static int inline +setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc) +{ + int owned_fp; + int err = 0; + + err |= __put_user(regs->cp0_epc, &sc->sc_pc); + err |= __put_user(regs->cp0_status, &sc->sc_status); + +#define save_gp_reg(i) { \ + err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); + save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); + save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); + save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); + save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); + save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); + save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); + save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); + save_gp_reg(31); +#undef save_gp_reg + + err |= __put_user(regs->hi, &sc->sc_mdhi); + err |= __put_user(regs->lo, &sc->sc_mdlo); + err |= __put_user(regs->cp0_cause, &sc->sc_cause); + err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr); + + owned_fp = (current == last_task_used_math); + err |= __put_user(owned_fp, &sc->sc_ownedfp); + + if (current->used_math) { /* fp is active. */ + set_cp0_status(ST0_CU1, ST0_CU1); + err |= save_fp_context(sc); + last_task_used_math = NULL; + regs->cp0_status &= ~ST0_CU1; + current->used_math = 0; + } + + return err; +} + +/* + * Determine which stack to use.. + */ +static inline void * +get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) +{ + unsigned long sp; + + /* Default to using normal stack */ + sp = regs->regs[29]; + + /* This is the X/Open sanctioned signal stack switching. */ + if ((ka->sa.sa_flags & SA_ONSTACK) && ! on_sig_stack(sp)) + sp = current->sas_ss_sp + current->sas_ss_size; + + return (void *)((sp - frame_size) & ALMASK); +} + +static void inline +setup_frame(struct k_sigaction * ka, struct pt_regs *regs, + int signr, sigset_t *set) +{ + struct sigframe *frame; + int err = 0; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) + goto give_sigsegv; + + /* Set up to return from userspace. If provided, use a stub already + in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) + regs->regs[31] = (unsigned long) ka->sa.sa_restorer; + else { + /* + * Set up the return code ... + * + * li v0, __NR_sigreturn + * syscall + */ + err |= __put_user(0x24020000 + __NR_sigreturn, + frame->sf_code + 0); + err |= __put_user(0x0000000c , + frame->sf_code + 1); + flush_cache_sigtramp((unsigned long) frame->sf_code); + } + + err |= setup_sigcontext(regs, &frame->sf_sc); + err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); + if (err) + goto give_sigsegv; + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = 0 (should be cause) + * a2 = pointer to struct sigcontext + * + * $25 and c0_epc point to the signal handler, $29 points to the + * struct sigframe. + */ + regs->regs[ 4] = signr; + regs->regs[ 5] = 0; + regs->regs[ 6] = (unsigned long) &frame->sf_sc; + regs->regs[29] = (unsigned long) frame; + regs->regs[31] = (unsigned long) frame->sf_code; + regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=0x%p pc=0x%p ra=0x%p\n", + current->comm, current->pid, frame, regs->cp0_epc, frame->code); +#endif + return; + +give_sigsegv: + if (signr == SIGSEGV) + ka->sa.sa_handler = SIG_DFL; + force_sig(SIGSEGV, current); +} + +static void inline +setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, + int signr, sigset_t *set, siginfo_t *info) +{ + struct rt_sigframe *frame; + int err = 0; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) + goto give_sigsegv; + + /* Set up to return from userspace. If provided, use a stub already + in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) + regs->regs[31] = (unsigned long) ka->sa.sa_restorer; + else { + /* + * Set up the return code ... + * + * li v0, __NR_sigreturn + * syscall + */ + err |= __put_user(0x24020000 + __NR_sigreturn, + frame->rs_code + 0); + err |= __put_user(0x0000000c , + frame->rs_code + 1); + flush_cache_sigtramp((unsigned long) frame->rs_code); + } + + /* Create siginfo. */ + err |= __copy_to_user(&frame->rs_info, info, sizeof(*info)); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->rs_uc.uc_flags); + err |= __put_user(0, &frame->rs_uc.uc_link); + err |= __put_user((void *)current->sas_ss_sp, + &frame->rs_uc.uc_stack.ss_sp); + err |= __put_user(sas_ss_flags(regs->regs[29]), + &frame->rs_uc.uc_stack.ss_flags); + err |= __put_user(current->sas_ss_size, + &frame->rs_uc.uc_stack.ss_size); + err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); + err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); + + if (err) + goto give_sigsegv; + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = 0 (should be cause) + * a2 = pointer to ucontext + * + * $25 and c0_epc point to the signal handler, $29 points to + * the struct rt_sigframe. + */ + regs->regs[ 4] = signr; + regs->regs[ 5] = (unsigned long) &frame->rs_info; + regs->regs[ 6] = (unsigned long) &frame->rs_uc; + regs->regs[29] = (unsigned long) frame; + regs->regs[31] = (unsigned long) frame->rs_code; + regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=0x%p pc=0x%p ra=0x%p\n", + current->comm, current->pid, frame, regs->cp0_epc, frame->code); +#endif + return; + +give_sigsegv: + if (signr == SIGSEGV) + ka->sa.sa_handler = SIG_DFL; + force_sig(SIGSEGV, current); +} + +static inline void +handle_signal(unsigned long sig, struct k_sigaction *ka, + siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) +{ + if (ka->sa.sa_flags & SA_SIGINFO) + setup_rt_frame(ka, regs, sig, oldset, info); + else + setup_frame(ka, regs, sig, oldset); + + if (ka->sa.sa_flags & SA_ONESHOT) + ka->sa.sa_handler = SIG_DFL; + if (!(ka->sa.sa_flags & SA_NODEFER)) { + spin_lock_irq(¤t->sigmask_lock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + sigaddset(¤t->blocked,sig); + recalc_sigpending(current); + spin_unlock_irq(¤t->sigmask_lock); + } +} + +static inline void +syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) +{ + switch(regs->regs[0]) { + case ERESTARTNOHAND: + regs->regs[2] = EINTR; + break; + case ERESTARTSYS: + if(!(ka->sa.sa_flags & SA_RESTART)) { + regs->regs[2] = EINTR; + break; + } + /* fallthrough */ + case ERESTARTNOINTR: /* Userland will reload $v0. */ + regs->regs[7] = regs->regs[26]; + regs->cp0_epc -= 8; + } + + regs->regs[0] = 0; /* Don't deal with this again. */ +} + +asmlinkage int do_signal32(sigset_t *oldset, struct pt_regs *regs) +{ + struct k_sigaction *ka; + siginfo_t info; +printk("%s: delivering signal.\n", current->comm); + + if (!oldset) + oldset = ¤t->blocked; + + for (;;) { + unsigned long signr; + + spin_lock_irq(¤t->sigmask_lock); + signr = dequeue_signal(¤t->blocked, &info); + spin_unlock_irq(¤t->sigmask_lock); + + if (!signr) + break; + + if ((current->flags & PF_PTRACED) && signr != SIGKILL) { + /* Let the debugger run. */ + current->exit_code = signr; + current->state = TASK_STOPPED; + notify_parent(current, SIGCHLD); + schedule(); + + /* We're back. Did the debugger cancel the sig? */ + if (!(signr = current->exit_code)) + continue; + current->exit_code = 0; + + /* The debugger continued. Ignore SIGSTOP. */ + 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; + /* Check for SIGCHLD: it's special. */ + while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0) + /* nothing */; + continue; + } + + if (ka->sa.sa_handler == SIG_DFL) { + int exit_code = signr; + + /* Init gets no signals it doesn't want. */ + 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; + /* FALLTHRU */ + + case SIGSTOP: + 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; + /* FALLTHRU */ + + default: + lock_kernel(); + sigaddset(¤t->signal, signr); + recalc_sigpending(current); + current->flags |= PF_SIGNALED; + do_exit(exit_code); + /* NOTREACHED */ + } + } + + if (regs->regs[0]) + syscall_restart(regs, ka); + /* Whee! Actually deliver the signal. */ +printk("%s: delivering signal.\n", __FUNCTION__); + handle_signal(signr, ka, &info, oldset, regs); + return 1; + } + + /* + * Who's code doesn't conform to the restartable syscall convention + * dies here!!! The li instruction, a single machine instruction, + * must directly be followed by the syscall instruction. + */ + if (regs->regs[0]) { + if (regs->regs[2] == ERESTARTNOHAND || + regs->regs[2] == ERESTARTSYS || + regs->regs[2] == ERESTARTNOINTR) { + regs->regs[7] = regs->regs[26]; + regs->cp0_epc -= 8; + } + } + return 0; +} + +/* Dummies ... */ + +asmlinkage void sys32_sigpending(void) { panic(__FUNCTION__ " called."); } +asmlinkage void sys32_rt_sigaction(void) { panic(__FUNCTION__ " called."); } +asmlinkage void sys32_rt_sigprocmask(void) { panic(__FUNCTION__ " called."); } +asmlinkage void sys32_rt_sigpending(void) { panic(__FUNCTION__ " called."); } +asmlinkage void sys32_rt_sigtimedwait(void) { panic(__FUNCTION__ " called."); } +asmlinkage void sys32_rt_sigqueueinfo(void) { panic(__FUNCTION__ " called."); } |