* Copyright (C) 1994 - 2000 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
-#include <linux/config.h>
+#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/personality.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/compiler.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/tracehook.h>
+#include <asm/abi.h>
#include <asm/asm.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/fpu.h>
#include <asm/sim.h>
-#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
+#include <asm/war.h>
+#include <asm/vdso.h>
#include "signal-common.h"
-#define DEBUG_SIG 0
+static int (*save_fp_context)(struct sigcontext __user *sc);
+static int (*restore_fp_context)(struct sigcontext __user *sc);
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
+extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
-static int do_signal(sigset_t *oldset, struct pt_regs *regs);
+extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
+extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
+
+struct sigframe {
+ u32 sf_ass[4]; /* argument save space for o32 */
+ u32 sf_pad[2]; /* Was: signal trampoline */
+ struct sigcontext sf_sc;
+ sigset_t sf_mask;
+};
+
+struct rt_sigframe {
+ u32 rs_ass[4]; /* argument save space for o32 */
+ u32 rs_pad[2]; /* Was: signal trampoline */
+ struct siginfo rs_info;
+ struct ucontext rs_uc;
+};
+
+/*
+ * Helper routines
+ */
+static int protected_save_fp_context(struct sigcontext __user *sc)
+{
+ int err;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(1);
+ err = save_fp_context(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __put_user(0, &sc->sc_fpregs[0]) |
+ __put_user(0, &sc->sc_fpregs[31]) |
+ __put_user(0, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
+static int protected_restore_fp_context(struct sigcontext __user *sc)
+{
+ int err, tmp;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(0);
+ err = restore_fp_context(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __get_user(tmp, &sc->sc_fpregs[0]) |
+ __get_user(tmp, &sc->sc_fpregs[31]) |
+ __get_user(tmp, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
+int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+ int err = 0;
+ int i;
+ unsigned int used_math;
+
+ err |= __put_user(regs->cp0_epc, &sc->sc_pc);
+
+ err |= __put_user(0, &sc->sc_regs[0]);
+ for (i = 1; i < 32; i++)
+ err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
+
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+ err |= __put_user(regs->acx, &sc->sc_acx);
+#endif
+ err |= __put_user(regs->hi, &sc->sc_mdhi);
+ err |= __put_user(regs->lo, &sc->sc_mdlo);
+ if (cpu_has_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(rddsp(DSP_MASK), &sc->sc_dsp);
+ }
+
+ used_math = !!used_math();
+ err |= __put_user(used_math, &sc->sc_used_math);
+
+ if (used_math) {
+ /*
+ * Save FPU state to signal context. Signal handler
+ * will "inherit" current FPU state.
+ */
+ err |= protected_save_fp_context(sc);
+ }
+ return err;
+}
+
+int fpcsr_pending(unsigned int __user *fpcsr)
+{
+ int err, sig = 0;
+ unsigned int csr, enabled;
+
+ err = __get_user(csr, fpcsr);
+ enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
+ /*
+ * If the signal handler set some FPU exceptions, clear it and
+ * send SIGFPE.
+ */
+ if (csr & enabled) {
+ csr &= ~enabled;
+ err |= __put_user(csr, fpcsr);
+ sig = SIGFPE;
+ }
+ return err ?: sig;
+}
+
+static int
+check_and_restore_fp_context(struct sigcontext __user *sc)
+{
+ int err, sig;
+
+ err = sig = fpcsr_pending(&sc->sc_fpc_csr);
+ if (err > 0)
+ err = 0;
+ err |= protected_restore_fp_context(sc);
+ return err ?: sig;
+}
+
+int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+ unsigned int used_math;
+ unsigned long treg;
+ int err = 0;
+ int i;
+
+ /* 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);
+
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+ err |= __get_user(regs->acx, &sc->sc_acx);
+#endif
+ 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);
+ }
+
+ for (i = 1; i < 32; i++)
+ err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
+
+ err |= __get_user(used_math, &sc->sc_used_math);
+ conditional_used_math(used_math);
+
+ if (used_math) {
+ /* restore fpu context if we have used it before */
+ if (!err)
+ err = check_and_restore_fp_context(sc);
+ } else {
+ /* signal handler may have used FPU. Give it up. */
+ lose_fpu(0);
+ }
+
+ return err;
+}
+
+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) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
+}
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
#ifdef CONFIG_TRAD_SIGNALS
-save_static_function(sys_sigsuspend);
-__attribute_used__ noinline static int
-_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
+asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
- sigset_t *uset, saveset, newset;
+ sigset_t newset;
+ sigset_t __user *uset;
- uset = (sigset_t *) regs.regs[4];
+ uset = (sigset_t __user *) regs.regs[4];
if (copy_from_user(&newset, uset, sizeof(sigset_t)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
+ current->saved_sigmask = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- regs.regs[2] = EINTR;
- regs.regs[7] = 1;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset, ®s))
- return -EINTR;
- }
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ return -ERESTARTNOHAND;
}
#endif
-save_static_function(sys_rt_sigsuspend);
-__attribute_used__ noinline static int
-_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
- sigset_t *unewset, saveset, newset;
+ sigset_t newset;
+ sigset_t __user *unewset;
size_t sigsetsize;
/* XXX Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
- unewset = (sigset_t *) regs.regs[4];
+ unewset = (sigset_t __user *) regs.regs[4];
if (copy_from_user(&newset, unewset, sizeof(newset)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
+ current->saved_sigmask = current->blocked;
current->blocked = newset;
- recalc_sigpending();
+ recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- regs.regs[2] = EINTR;
- regs.regs[7] = 1;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset, ®s))
- return -EINTR;
- }
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ return -ERESTARTNOHAND;
}
#ifdef CONFIG_TRAD_SIGNALS
-asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
- struct sigaction *oact)
+SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
+ struct sigaction __user *, oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
if (!ret && oact) {
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
- return -EFAULT;
+ 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);
asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
{
- const stack_t *uss = (const stack_t *) regs.regs[4];
- stack_t *uoss = (stack_t *) regs.regs[5];
+ const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
+ stack_t __user *uoss = (stack_t __user *) regs.regs[5];
unsigned long usp = regs.regs[29];
return do_sigaltstack(uss, uoss, usp);
}
-#if PLAT_TRAMPOLINE_STUFF_LINE
-#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
-#else
-#define __tramp
-#endif
-
#ifdef CONFIG_TRAD_SIGNALS
-struct sigframe {
- u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_code[2] __tramp; /* signal trampoline */
- struct sigcontext sf_sc __tramp;
- sigset_t sf_mask;
-};
-#endif
-
-struct rt_sigframe {
- u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_code[2] __tramp; /* signal trampoline */
- struct siginfo rs_info __tramp;
- struct ucontext rs_uc;
-};
-
-#ifdef CONFIG_TRAD_SIGNALS
-save_static_function(sys_sigreturn);
-__attribute_used__ noinline static void
-_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
+asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
{
- struct sigframe *frame;
+ struct sigframe __user *frame;
sigset_t blocked;
+ int sig;
- frame = (struct sigframe *) regs.regs[29];
+ 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)))
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (restore_sigcontext(®s, &frame->sf_sc))
+ sig = restore_sigcontext(®s, &frame->sf_sc);
+ if (sig < 0)
goto badframe;
+ else if (sig)
+ force_sig(sig, current);
/*
* Don't let your children do this ...
*/
- if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
- do_syscall_trace(®s, 1);
__asm__ __volatile__(
"move\t$29, %0\n\t"
"j\tsyscall_exit"
badframe:
force_sig(SIGSEGV, current);
}
-#endif
+#endif /* CONFIG_TRAD_SIGNALS */
-save_static_function(sys_rt_sigreturn);
-__attribute_used__ noinline static void
-_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
+asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
{
- struct rt_sigframe *frame;
+ struct rt_sigframe __user *frame;
sigset_t set;
stack_t st;
+ int sig;
- frame = (struct rt_sigframe *) regs.regs[29];
+ frame = (struct rt_sigframe __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)))
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
+ sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
+ if (sig < 0)
goto badframe;
+ else if (sig)
+ force_sig(sig, current);
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]);
+ do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
/*
* Don't let your children do this ...
}
#ifdef CONFIG_TRAD_SIGNALS
-static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set)
+static int setup_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set)
{
- struct sigframe *frame;
+ 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_sigreturn
- * syscall
- */
- if (PLAT_TRAMPOLINE_STUFF_LINE)
- __clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
- 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)
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->regs[31] = (unsigned long) sig_return;
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",
+ DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
current->comm, current->pid,
- frame, regs->cp0_epc, frame->regs[31]);
-#endif
- return;
+ frame, regs->cp0_epc, regs->regs[31]);
+ return 0;
give_sigsegv:
force_sigsegv(signr, current);
+ return -EFAULT;
}
#endif
-static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set,
+ siginfo_t *info)
{
- struct rt_sigframe *frame;
+ struct rt_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_rt_sigreturn
- * syscall
- */
- if (PLAT_TRAMPOLINE_STUFF_LINE)
- __clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
- err |= __put_user(0x24020000 + __NR_rt_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_siginfo_to_user(&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);
- err |= __put_user((void *)current->sas_ss_sp,
+ err |= __put_user(NULL, &frame->rs_uc.uc_link);
+ err |= __put_user((void __user *)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);
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->regs[31] = (unsigned long) sig_return;
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",
+ DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
current->comm, current->pid,
frame, regs->cp0_epc, regs->regs[31]);
-#endif
- return;
+
+ return 0;
give_sigsegv:
force_sigsegv(signr, current);
+ return -EFAULT;
}
-extern void setup_rt_frame_n32(struct k_sigaction * ka,
- struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
+struct mips_abi mips_abi = {
+#ifdef CONFIG_TRAD_SIGNALS
+ .setup_frame = setup_frame,
+ .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
+#endif
+ .setup_rt_frame = setup_rt_frame,
+ .rt_signal_return_offset =
+ offsetof(struct mips_vdso, rt_signal_trampoline),
+ .restart = __NR_restart_syscall
+};
-static inline void handle_signal(unsigned long sig, siginfo_t *info,
+static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
+ int ret;
+ struct mips_abi *abi = current->thread.abi;
+ void *vdso = current->mm->context.vdso;
+
switch(regs->regs[0]) {
case ERESTART_RESTARTBLOCK:
case ERESTARTNOHAND:
regs->regs[2] = EINTR;
break;
case ERESTARTSYS:
- if(!(ka->sa.sa_flags & SA_RESTART)) {
+ if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->regs[2] = EINTR;
break;
}
regs->regs[0] = 0; /* Don't deal with this again. */
-#ifdef CONFIG_TRAD_SIGNALS
- if (ka->sa.sa_flags & SA_SIGINFO) {
-#else
- if (1) {
-#endif
-#ifdef CONFIG_MIPS32_N32
- if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
- setup_rt_frame_n32 (ka, regs, sig, oldset, info);
- else
-#endif
- setup_rt_frame(ka, regs, sig, oldset, info);
- }
-#ifdef CONFIG_TRAD_SIGNALS
+ if (sig_uses_siginfo(ka))
+ ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
+ ka, regs, sig, oldset, info);
else
- setup_frame(ka, regs, sig, oldset);
-#endif
+ ret = abi->setup_frame(vdso + abi->signal_return_offset,
+ ka, regs, sig, oldset);
- if (!(ka->sa.sa_flags & SA_NODEFER)) {
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
- sigaddset(¤t->blocked,sig);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
- }
-}
+ 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);
-extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
-extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
+ return ret;
+}
-static int do_signal(sigset_t *oldset, struct pt_regs *regs)
+static void do_signal(struct pt_regs *regs)
{
struct k_sigaction ka;
+ sigset_t *oldset;
siginfo_t info;
int signr;
-#ifdef CONFIG_BINFMT_ELF32
- if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
- return do_signal32(oldset, regs);
- }
-#endif
-
/*
* 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 1;
-
- if (try_to_freeze())
- goto no_signal;
+ return;
- if (!oldset)
+ 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) {
- handle_signal(signr, &info, &ka, oldset, regs);
- return 1;
+ /* 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);
+ }
+
+ return;
}
-no_signal:
/*
* Who's code doesn't conform to the restartable syscall convention
* dies here!!! The li instruction, a single machine instruction,
regs->cp0_epc -= 8;
}
if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
- regs->regs[2] = __NR_restart_syscall;
+ regs->regs[2] = current->thread.abi->restart;
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 4;
}
+ regs->regs[0] = 0; /* Don't deal with this again. */
+ }
+
+ /*
+ * 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);
}
- return 0;
}
/*
* notification of userspace execution resumption
- * - triggered by current->work.notify_resume
+ * - triggered by the TIF_WORK_MASK flags
*/
-asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
__u32 thread_info_flags)
{
/* deal with pending signal delivery */
- if (thread_info_flags & _TIF_SIGPENDING) {
-#ifdef CONFIG_BINFMT_ELF32
- if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
- do_signal32(oldset, regs);
- return;
- }
-#endif
-#ifdef CONFIG_BINFMT_IRIX
- if (unlikely(current->personality != PER_LINUX)) {
- do_irix_signal(oldset, regs);
- return;
- }
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ do_signal(regs);
+
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ tracehook_notify_resume(regs);
+ if (current->replacement_session_keyring)
+ key_replace_session_keyring();
+ }
+}
+
+#ifdef CONFIG_SMP
+static int smp_save_fp_context(struct sigcontext __user *sc)
+{
+ return raw_cpu_has_fpu
+ ? _save_fp_context(sc)
+ : fpu_emulator_save_context(sc);
+}
+
+static int smp_restore_fp_context(struct sigcontext __user *sc)
+{
+ return raw_cpu_has_fpu
+ ? _restore_fp_context(sc)
+ : fpu_emulator_restore_context(sc);
+}
#endif
- do_signal(oldset, regs);
+
+static int signal_setup(void)
+{
+#ifdef CONFIG_SMP
+ /* For now just do the cpu_has_fpu check when the functions are invoked */
+ save_fp_context = smp_save_fp_context;
+ restore_fp_context = smp_restore_fp_context;
+#else
+ if (cpu_has_fpu) {
+ save_fp_context = _save_fp_context;
+ restore_fp_context = _restore_fp_context;
+ } else {
+ save_fp_context = fpu_emulator_save_context;
+ restore_fp_context = fpu_emulator_restore_context;
}
+#endif
+
+ return 0;
}
+
+arch_initcall(signal_setup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff