/* * 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, 2006 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #include <linux/cache.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/syscalls.h> #include <linux/errno.h> #include <linux/wait.h> #include <linux/ptrace.h> #include <linux/compat.h> #include <linux/suspend.h> #include <linux/compiler.h> #include <asm/abi.h> #include <asm/asm.h> #include <linux/bitops.h> #include <asm/cacheflush.h> #include <asm/sim.h> #include <asm/uaccess.h> #include <asm/ucontext.h> #include <asm/system.h> #include <asm/fpu.h> #include <asm/war.h> #define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) typedef struct compat_siginfo { int si_signo; int si_code; int si_errno; union { int _pad[SI_PAD_SIZE32]; /* kill() */ struct { compat_pid_t _pid; /* sender's pid */ compat_uid_t _uid; /* sender's uid */ } _kill; /* SIGCHLD */ struct { compat_pid_t _pid; /* which child */ compat_uid_t _uid; /* sender's uid */ int _status; /* exit code */ compat_clock_t _utime; compat_clock_t _stime; } _sigchld; /* IRIX SIGCHLD */ struct { compat_pid_t _pid; /* which child */ compat_clock_t _utime; int _status; /* exit code */ compat_clock_t _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 { timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval;/* same as below */ int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ struct { compat_pid_t _pid; /* sender's pid */ compat_uid_t _uid; /* sender's uid */ compat_sigval_t _sigval; } _rt; } _sifields; } compat_siginfo_t; /* * Including <asm/unistd.h> 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))) /* 32-bit compatibility types */ #define _NSIG_BPW32 32 #define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32) typedef struct { unsigned int sig[_NSIG_WORDS32]; } sigset_t32; typedef unsigned int __sighandler32_t; typedef void (*vfptr_t)(void); struct sigaction32 { unsigned int sa_flags; __sighandler32_t sa_handler; compat_sigset_t sa_mask; }; /* IRIX compatible stack_t */ typedef struct sigaltstack32 { s32 ss_sp; compat_size_t ss_size; int ss_flags; } stack32_t; 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, compat_sigset_t __user *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 compat_sigset_t __user *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); __attribute_used__ noinline static int _sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) { compat_sigset_t __user *uset; sigset_t newset; uset = (compat_sigset_t __user *) regs.regs[4]; if (get_sigset(&newset, uset)) return -EFAULT; sigdelsetmask(&newset, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->saved_sigmask = current->blocked; current->blocked = newset; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); current->state = TASK_INTERRUPTIBLE; schedule(); set_thread_flag(TIF_RESTORE_SIGMASK); return -ERESTARTNOHAND; } save_static_function(sys32_rt_sigsuspend); __attribute_used__ noinline static int _sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) { compat_sigset_t __user *uset; sigset_t newset; size_t sigsetsize; /* XXX Don't preclude handling different sized sigset_t's. */ sigsetsize = regs.regs[5]; if (sigsetsize != sizeof(compat_sigset_t)) return -EINVAL; uset = (compat_sigset_t __user *) regs.regs[4]; if (get_sigset(&newset, uset)) return -EFAULT; sigdelsetmask(&newset, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->saved_sigmask = current->blocked; current->blocked = newset; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); current->state = TASK_INTERRUPTIBLE; schedule(); set_thread_flag(TIF_RESTORE_SIGMASK); return -ERESTARTNOHAND; } asmlinkage int sys32_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *oact) { struct k_sigaction new_ka, old_ka; int ret; int err = 0; if (act) { old_sigset_t mask; s32 handler; if (!access_ok(VERIFY_READ, act, sizeof(*act))) return -EFAULT; err |= __get_user(handler, &act->sa_handler); new_ka.sa.sa_handler = (void __user *)(s64)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(nabi_no_regargs struct pt_regs regs) { const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4]; stack32_t __user *uoss = (stack32_t __user *) 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 __user *) (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 ? (stack_t __user *)&kss : NULL, uoss ? (stack_t __user *)&koss : NULL, usp); set_fs (old_fs); if (!ret && uoss) { if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) return -EFAULT; sp = (int) (unsigned 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 int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *sc) { u32 used_math; int err = 0; s32 treg; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; 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); if (cpu_has_dsp) { err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); } #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(used_math, &sc->sc_used_math); conditional_used_math(used_math); preempt_disable(); if (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(); } preempt_enable(); return err; } struct sigframe { u32 sf_ass[4]; /* argument save space for o32 */ #if ICACHE_REFILLS_WORKAROUND_WAR u32 sf_pad[2]; #else u32 sf_code[2]; /* signal trampoline */ #endif struct sigcontext32 sf_sc; sigset_t sf_mask; #if ICACHE_REFILLS_WORKAROUND_WAR u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ #endif }; struct rt_sigframe32 { u32 rs_ass[4]; /* argument save space for o32 */ #if ICACHE_REFILLS_WORKAROUND_WAR u32 rs_pad[2]; #else u32 rs_code[2]; /* signal trampoline */ #endif compat_siginfo_t rs_info; struct ucontext32 rs_uc; #if ICACHE_REFILLS_WORKAROUND_WAR u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */ #endif }; int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) { int err; if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) 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_TIMER >> 16: err |= __put_user(from->si_tid, &to->si_tid); err |= __put_user(from->si_overrun, &to->si_overrun); err |= __put_user(from->si_int, &to->si_int); break; 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((unsigned 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 >> 16: /* This is not generated by the kernel as of now. */ case __SI_MESGQ >> 16: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); err |= __put_user(from->si_int, &to->si_int); break; } } return err; } save_static_function(sys32_sigreturn); __attribute_used__ noinline static void _sys32_sigreturn(nabi_no_regargs struct pt_regs regs) { struct sigframe __user *frame; sigset_t blocked; frame = (struct sigframe __user *) 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->sighand->siglock); current->blocked = blocked; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); if (restore_sigcontext32(®s, &frame->sf_sc)) goto badframe; /* * Don't let your children do this ... */ __asm__ __volatile__( "move\t$29, %0\n\t" "j\tsyscall_exit" :/* no outputs */ :"r" (®s)); /* Unreached */ badframe: force_sig(SIGSEGV, current); } save_static_function(sys32_rt_sigreturn); __attribute_used__ noinline static void _sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) { struct rt_sigframe32 __user *frame; mm_segment_t old_fs; sigset_t set; stack_t st; s32 sp; frame = (struct rt_sigframe32 __user *) 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->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); 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_sp = (void __user *)(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. */ old_fs = get_fs(); set_fs (KERNEL_DS); do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); set_fs (old_fs); /* * Don't let your children do this ... */ __asm__ __volatile__( "move\t$29, %0\n\t" "j\tsyscall_exit" :/* no outputs */ :"r" (®s)); /* Unreached */ badframe: force_sig(SIGSEGV, current); } static inline int setup_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *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); if (cpu_has_dsp) { err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); err |= __put_user(mfhi1(), &sc->sc_hi1); err |= __put_user(mflo1(), &sc->sc_lo1); err |= __put_user(mfhi2(), &sc->sc_hi2); err |= __put_user(mflo2(), &sc->sc_lo2); err |= __put_user(mfhi3(), &sc->sc_hi3); err |= __put_user(mflo3(), &sc->sc_lo3); } err |= __put_user(!!used_math(), &sc->sc_used_math); if (!used_math()) goto out; /* * Save FPU state to signal context. Signal handler will "inherit" * current FPU state. */ preempt_disable(); if (!is_fpu_owner()) { own_fpu(); restore_fp(current); } err |= save_fp_context32(sc); preempt_enable(); out: return err; } /* * Determine which stack to use.. */ static inline void __user *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 __user *)((sp - frame_size) & ALMASK); } int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, int signr, sigset_t *set) { struct sigframe __user *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 0; give_sigsegv: force_sigsegv(signr, current); return -EFAULT; } int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) { struct rt_sigframe32 __user *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 -> compat_siginfo_t) 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 0; give_sigsegv: force_sigsegv(signr, current); return -EFAULT; } static inline int handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs) { int ret; switch (regs->regs[0]) { case ERESTART_RESTARTBLOCK: 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. */ if (ka->sa.sa_flags & SA_SIGINFO) ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); else ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); if (!(ka->sa.sa_flags & SA_NODEFER)) sigaddset(¤t->blocked,sig); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return ret; } void do_signal32(struct pt_regs *regs) { struct k_sigaction ka; sigset_t *oldset; siginfo_t info; int signr; /* * We want the common case to go fast, which is why we may in certain * cases get here from kernel mode. Just return without doing anything * if so. */ if (!user_mode(regs)) return; if (try_to_freeze()) goto no_signal; if (test_thread_flag(TIF_RESTORE_SIGMASK)) oldset = ¤t->saved_sigmask; else oldset = ¤t->blocked; signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { /* Whee! Actually deliver the signal. */ if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { /* * A signal was successfully delivered; the saved * sigmask will have been stored in the signal frame, * and will be restored by sigreturn, so we can simply * clear the TIF_RESTORE_SIGMASK flag. */ if (test_thread_flag(TIF_RESTORE_SIGMASK)) clear_thread_flag(TIF_RESTORE_SIGMASK); } } no_signal: /* * 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; } if (regs->regs[2] == ERESTART_RESTARTBLOCK) { regs->regs[2] = __NR_O32_restart_syscall; regs->regs[7] = regs->regs[26]; regs->cp0_epc -= 4; } } /* * If there's no signal to deliver, we just put the saved sigmask * back */ if (test_thread_flag(TIF_RESTORE_SIGMASK)) { clear_thread_flag(TIF_RESTORE_SIGMASK); sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } } asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *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) { s32 handler; int err = 0; if (!access_ok(VERIFY_READ, act, sizeof(*act))) return -EFAULT; err |= __get_user(handler, &act->sa_handler); new_sa.sa.sa_handler = (void __user *)(s64)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 int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *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 ? (sigset_t __user *)&new_set : NULL, oset ? (sigset_t __user *)&old_set : NULL, sigsetsize); set_fs (old_fs); if (!ret && oset && put_sigset(&old_set, oset)) return -EFAULT; return ret; } asmlinkage int sys32_rt_sigpending(compat_sigset_t __user *uset, unsigned int sigsetsize) { int ret; sigset_t set; mm_segment_t old_fs = get_fs(); set_fs (KERNEL_DS); ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize); set_fs (old_fs); if (!ret && put_sigset(&set, uset)) return -EFAULT; return ret; } asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *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, (siginfo_t __user *)&info); set_fs (old_fs); return ret; } asmlinkage long sys32_waitid(int which, compat_pid_t pid, compat_siginfo_t __user *uinfo, int options, struct compat_rusage __user *uru) { siginfo_t info; struct rusage ru; long ret; mm_segment_t old_fs = get_fs(); info.si_signo = 0; set_fs (KERNEL_DS); ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options, uru ? (struct rusage __user *) &ru : NULL); set_fs (old_fs); if (ret < 0 || info.si_signo == 0) return ret; if (uru && (ret = put_compat_rusage(&ru, uru))) return ret; BUG_ON(info.si_code & __SI_MASK); info.si_code |= __SI_CHLD; return copy_siginfo_to_user32(uinfo, &info); }