/* * 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 - 2000 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Including would give use the 64-bit syscall numbers ... */ #define __NR_O32_sigreturn 4119 #define __NR_O32_rt_sigreturn 4193 #define __NR_O32_restart_syscall 4253 #define DEBUG_SIG 0 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) extern asmlinkage int do_signal32(sigset_t *oldset, struct pt_regs *regs); extern asmlinkage void syscall_trace(void); /* 32-bit compatibility types */ #define _NSIG32_BPW 32 #define _NSIG32_WORDS (_NSIG / _NSIG32_BPW) typedef struct { unsigned int sig[_NSIG32_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; }; /* IRIX compatible stack_t */ typedef struct sigaltstack32 { s32 ss_sp; __kernel_size_t32 ss_size; int ss_flags; } stack32_t; typedef union sigval32 { int sival_int; s32 sival_ptr; } sigval_t32; #define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) typedef struct siginfo32 { int si_signo; int si_code; int si_errno; union { int _pad[SI_PAD_SIZE32]; /* kill() */ struct { __kernel_pid_t32 _pid; /* sender's pid */ __kernel_uid_t32 _uid; /* sender's uid */ } _kill; /* SIGCHLD */ struct { __kernel_pid_t32 _pid; /* which child */ __kernel_uid_t32 _uid; /* sender's uid */ int _status; /* exit code */ __kernel_clock_t32 _utime; __kernel_clock_t32 _stime; } _sigchld; /* IRIX SIGCHLD */ struct { __kernel_pid_t32 _pid; /* which child */ __kernel_clock_t32 _utime; int _status; /* exit code */ __kernel_clock_t32 _stime; } _irix_sigchld; /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ struct { s32 _addr; /* faulting insn/memory ref. */ } _sigfault; /* SIGPOLL, SIGXFSZ (To do ...) */ struct { int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ int _fd; } _sigpoll; /* POSIX.1b timers */ struct { unsigned int _timer1; unsigned int _timer2; } _timer; /* POSIX.1b signals */ struct { __kernel_pid_t32 _pid; /* sender's pid */ __kernel_uid_t32 _uid; /* sender's uid */ sigval_t32 _sigval; } _rt; } _sifields; } siginfo_t32; struct ucontext32 { u32 uc_flags; s32 uc_link; stack32_t uc_stack; struct sigcontext32 uc_mcontext; sigset_t32 uc_sigmask; /* mask last for extensibility */ }; extern void __put_sigset_unknown_nsig(void); extern void __get_sigset_unknown_nsig(void); static inline int put_sigset(const sigset_t *kbuf, sigset32_t *ubuf) { int err = 0; if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) return -EFAULT; switch (_NSIG_WORDS) { default: __put_sigset_unknown_nsig(); case 2: err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]); err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); case 1: err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]); err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); } return err; } static inline int get_sigset(sigset_t *kbuf, const sigset32_t *ubuf) { int err = 0; unsigned long sig[4]; if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) return -EFAULT; switch (_NSIG_WORDS) { default: __get_sigset_unknown_nsig(); case 2: err |= __get_user (sig[3], &ubuf->sig[3]); err |= __get_user (sig[2], &ubuf->sig[2]); kbuf->sig[1] = sig[2] | (sig[3] << 32); case 1: err |= __get_user (sig[1], &ubuf->sig[1]); err |= __get_user (sig[0], &ubuf->sig[0]); kbuf->sig[0] = sig[0] | (sig[1] << 32); } return err; } /* * Atomically swap in the new signal mask, and wait for a signal. */ save_static_function(sys32_sigsuspend); static_unused int _sys32_sigsuspend(abi64_no_regargs, struct pt_regs regs) { sigset32_t *uset; sigset_t newset, saveset; uset = (sigset32_t *) regs.regs[4]; if (get_sigset(&newset, uset)) 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; } } save_static_function(sys32_rt_sigsuspend); static_unused int _sys32_rt_sigsuspend(abi64_no_regargs, struct pt_regs regs) { sigset32_t *uset; sigset_t newset, saveset; size_t sigsetsize; /* XXX Don't preclude handling different sized sigset_t's. */ sigsetsize = regs.regs[5]; if (sigsetsize != sizeof(sigset32_t)) return -EINVAL; uset = (sigset32_t *) regs.regs[4]; if (get_sigset(&newset, uset)) 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((u32)(u64)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]); 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((u32)(u64)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]); if (err) return -EFAULT; } return ret; } asmlinkage int sys32_sigaltstack(abi64_no_regargs, struct pt_regs regs) { const stack32_t *uss = (const stack32_t *) regs.regs[4]; stack32_t *uoss = (stack32_t *) regs.regs[5]; unsigned long usp = regs.regs[29]; stack_t kss, koss; int ret, err = 0; mm_segment_t old_fs = get_fs(); s32 sp; if (uss) { if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) return -EFAULT; err |= __get_user(sp, &uss->ss_sp); kss.ss_sp = (void *) (long) sp; err |= __get_user(kss.ss_size, &uss->ss_size); err |= __get_user(kss.ss_flags, &uss->ss_flags); if (err) return -EFAULT; } set_fs (KERNEL_DS); ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp); set_fs (old_fs); if (!ret && uoss) { if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) return -EFAULT; sp = (int) (long) koss.ss_sp; err |= __put_user(sp, &uoss->ss_sp); err |= __put_user(koss.ss_size, &uoss->ss_size); err |= __put_user(koss.ss_flags, &uoss->ss_flags); if (err) return -EFAULT; } return ret; } static asmlinkage int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc) { 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(current->used_math, &sc->sc_used_math); if (current->used_math) { /* restore fpu context if we have used it before */ own_fpu(); err |= restore_fp_context32(sc); } else { /* signal handler may have used FPU. Give it up. */ lose_fpu(); } return err; } struct sigframe { u32 sf_ass[4]; /* argument save space for o32 */ u32 sf_code[2]; /* signal trampoline */ struct sigcontext32 sf_sc; sigset_t sf_mask; }; struct rt_sigframe32 { u32 rs_ass[4]; /* argument save space for o32 */ u32 rs_code[2]; /* signal trampoline */ struct siginfo32 rs_info; struct ucontext32 rs_uc; }; static int copy_siginfo_to_user32(siginfo_t32 *to, siginfo_t *from) { int err; if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32))) return -EFAULT; /* 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. This routine must convert siginfo from 64bit to 32bit as well at the same time. */ 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); if (from->si_code < 0) err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); else { 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); err |= __put_user(from->si_status, &to->si_status); default: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); break; case __SI_FAULT >> 16: err |= __put_user((long)from->si_addr, &to->si_addr); break; case __SI_POLL >> 16: err |= __put_user(from->si_band, &to->si_band); err |= __put_user(from->si_fd, &to->si_fd); break; /* case __SI_RT: This is not generated by the kernel as of now. */ } } return err; } asmlinkage void sys32_sigreturn(abi64_no_regargs, struct pt_regs regs) { struct sigframe *frame; sigset_t blocked; 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_sigcontext32(®s, &frame->sf_sc)) goto badframe; /* * Don't let your children do this ... */ if (current->ptrace & PT_TRACESYS) syscall_trace(); __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_sigframe32 *frame; sigset_t set; stack_t st; s32 sp; frame = (struct rt_sigframe32 *) 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_sigcontext32(®s, &frame->rs_uc.uc_mcontext)) goto badframe; /* The ucontext contains a stack32_t, so we must convert! */ if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) goto badframe; st.ss_size = (long) sp; if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) goto badframe; if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 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_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc) { 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); err |= __put_user(current->used_math, &sc->sc_used_math); if (!current->used_math) goto out; /* * Save FPU state to signal context. Signal handler will "inherit" * current FPU state. */ if (!is_fpu_owner()) { own_fpu(); restore_fp(current); } err |= save_fp_context32(sc); out: 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]; /* * FPU emulator may have it's own trampoline active just * above the user stack, 16-bytes before the next lowest * 16 byte boundary. Try to avoid trashing it. */ sp -= 32; /* This is the X/Open sanctioned signal stack switching. */ if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) 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 the return code ... * * li v0, __NR_O32_sigreturn * syscall */ err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0); err |= __put_user(0x0000000c , frame->sf_code + 1); flush_cache_sigtramp((unsigned long) frame->sf_code); err |= setup_sigcontext32(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%lx ra=0x%p\n", current->comm, current->pid, frame, regs->cp0_epc, frame->sf_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_sigframe32 *frame; int err = 0; s32 sp; 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. */ /* * Set up the return code ... * * li v0, __NR_O32_rt_sigreturn * syscall */ err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0); err |= __put_user(0x0000000c , frame->rs_code + 1); flush_cache_sigtramp((unsigned long) frame->rs_code); /* Convert (siginfo_t -> siginfo_t32) and copy to user. */ err |= copy_siginfo_to_user32(&frame->rs_info, info); /* Create the ucontext. */ err |= __put_user(0, &frame->rs_uc.uc_flags); err |= __put_user(0, &frame->rs_uc.uc_link); sp = (int) (long) current->sas_ss_sp; err |= __put_user(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_sigcontext32(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_sigframe32. */ 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%lx ra=0x%p\n", current->comm, current->pid, frame, regs->cp0_epc, frame->rs_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; 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->ptrace & PT_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: case SIGURG: 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: sig_exit(signr, exit_code, &info); /* NOTREACHED */ } } if (regs->regs[0]) syscall_restart(regs, ka); /* Whee! Actually deliver the signal. */ 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; } extern asmlinkage int sys_sigprocmask(int how, old_sigset_t *set, old_sigset_t *oset); asmlinkage int sys32_sigprocmask(int how, old_sigset_t32 *set, old_sigset_t32 *oset) { old_sigset_t s; int ret; mm_segment_t old_fs = get_fs(); if (set && get_user (s, set)) return -EFAULT; set_fs (KERNEL_DS); ret = sys_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL); set_fs (old_fs); if (!ret && oset && put_user (s, oset)) return -EFAULT; return ret; } asmlinkage long sys_sigpending(old_sigset_t *set); asmlinkage int sys32_sigpending(old_sigset_t32 *set) { old_sigset_t pending; int ret; mm_segment_t old_fs = get_fs(); set_fs (KERNEL_DS); ret = sys_sigpending(&pending); set_fs (old_fs); if (put_user(pending, set)) return -EFAULT; return ret; } asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act, struct sigaction32 *oact, unsigned int sigsetsize) { struct k_sigaction new_sa, old_sa; int ret = -EINVAL; /* XXX: Don't preclude handling different sized sigset_t's. */ if (sigsetsize != sizeof(sigset_t)) goto out; if (act) { int err = 0; if (!access_ok(VERIFY_READ, act, sizeof(*act))) return -EFAULT; err |= __get_user((u32)(u64)new_sa.sa.sa_handler, &act->sa_handler); err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); if (err) return -EFAULT; } ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); if (!ret && oact) { int err = 0; if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) return -EFAULT; err |= __put_user((u32)(u64)old_sa.sa.sa_handler, &oact->sa_handler); err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); if (err) return -EFAULT; } out: return ret; } asmlinkage long sys_rt_sigprocmask(int how, sigset_t *set, sigset_t *oset, size_t sigsetsize); asmlinkage int sys32_rt_sigprocmask(int how, sigset32_t *set, sigset32_t *oset, unsigned int sigsetsize) { sigset_t old_set, new_set; int ret; mm_segment_t old_fs = get_fs(); if (set && get_sigset(&new_set, set)) return -EFAULT; set_fs (KERNEL_DS); ret = sys_rt_sigprocmask(how, set ? &new_set : NULL, oset ? &old_set : NULL, sigsetsize); set_fs (old_fs); if (!ret && oset && put_sigset(&old_set, oset)) return -EFAULT; return ret; } asmlinkage long sys_rt_sigpending(sigset_t *set, size_t sigsetsize); asmlinkage int sys32_rt_sigpending(sigset32_t *uset, unsigned int sigsetsize) { int ret; sigset_t set; mm_segment_t old_fs = get_fs(); set_fs (KERNEL_DS); ret = sys_rt_sigpending(&set, sigsetsize); set_fs (old_fs); if (!ret && put_sigset(&set, uset)) return -EFAULT; return ret; } struct timespec32 { int tv_sec; int tv_nsec; }; asmlinkage int sys32_rt_sigtimedwait(sigset_t32 *uthese, siginfo_t32 *uinfo, struct timespec32 *uts, __kernel_size_t32 sigsetsize) { int ret, sig; sigset_t these; sigset_t32 these32; struct timespec ts; siginfo_t info; long timeout = 0; /* * As the result of a brainfarting competition a few years ago the * size of sigset_t for the 32-bit kernel was choosen to be 128 bits * but nothing so far is actually using that many, 64 are enough. So * for now we just drop the high bits. */ if (copy_from_user (&these32, uthese, sizeof(old_sigset_t32))) return -EFAULT; switch (_NSIG_WORDS) { #ifdef __MIPSEB__ case 4: these.sig[3] = these32.sig[6] | (((long)these32.sig[7]) << 32); case 3: these.sig[2] = these32.sig[4] | (((long)these32.sig[5]) << 32); case 2: these.sig[1] = these32.sig[2] | (((long)these32.sig[3]) << 32); case 1: these.sig[0] = these32.sig[0] | (((long)these32.sig[1]) << 32); #endif #ifdef __MIPSEL__ case 4: these.sig[3] = these32.sig[7] | (((long)these32.sig[6]) << 32); case 3: these.sig[2] = these32.sig[5] | (((long)these32.sig[4]) << 32); case 2: these.sig[1] = these32.sig[3] | (((long)these32.sig[2]) << 32); case 1: these.sig[0] = these32.sig[1] | (((long)these32.sig[0]) << 32); #endif } /* * Invert the set of allowed signals to get those we * want to block. */ sigdelsetmask(&these, sigmask(SIGKILL)|sigmask(SIGSTOP)); signotset(&these); if (uts) { if (get_user (ts.tv_sec, &uts->tv_sec) || get_user (ts.tv_nsec, &uts->tv_nsec)) return -EINVAL; if (ts.tv_nsec >= 1000000000L || ts.tv_nsec < 0 || ts.tv_sec < 0) return -EINVAL; } spin_lock_irq(¤t->sigmask_lock); sig = dequeue_signal(&these, &info); if (!sig) { /* None ready -- temporarily unblock those we're interested in so that we'll be awakened when they arrive. */ sigset_t oldblocked = current->blocked; sigandsets(¤t->blocked, ¤t->blocked, &these); recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); timeout = MAX_SCHEDULE_TIMEOUT; if (uts) timeout = (timespec_to_jiffies(&ts) + (ts.tv_sec || ts.tv_nsec)); current->state = TASK_INTERRUPTIBLE; timeout = schedule_timeout(timeout); spin_lock_irq(¤t->sigmask_lock); sig = dequeue_signal(&these, &info); current->blocked = oldblocked; recalc_sigpending(current); } spin_unlock_irq(¤t->sigmask_lock); if (sig) { ret = sig; if (uinfo) { if (copy_siginfo_to_user32(uinfo, &info)) ret = -EFAULT; } } else { ret = -EAGAIN; if (timeout) ret = -EINTR; } return ret; } extern asmlinkage int sys_rt_sigqueueinfo(int pid, int sig, siginfo_t *uinfo); asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, siginfo_t32 *uinfo) { siginfo_t info; int ret; mm_segment_t old_fs = get_fs(); if (copy_from_user (&info, uinfo, 3*sizeof(int)) || copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) return -EFAULT; set_fs (KERNEL_DS); ret = sys_rt_sigqueueinfo(pid, sig, &info); set_fs (old_fs); return ret; }