* 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/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
+#include <linux/compiler.h>
+#include <asm/abi.h>
#include <asm/asm.h>
-#include <asm/bitops.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 "signal-common.h"
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-extern asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
-
-extern asmlinkage void do_syscall_trace(void);
-
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
#ifdef CONFIG_TRAD_SIGNALS
save_static_function(sys_sigsuspend);
-static_unused int _sys_sigsuspend(struct pt_regs regs)
+__attribute_used__ noinline static 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);
-static_unused int _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+__attribute_used__ noinline static 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();
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)
+asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act,
+ struct sigaction __user *oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
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);
}
-asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
-{
- int err = 0;
-
- /* 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);
-
-#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_context(sc);
- } else {
- /* signal handler may have used FPU. Give it up. */
- lose_fpu();
- }
-
- return err;
-}
-
+/*
+ * Horribly complicated - with the bloody RM9000 workarounds enabled
+ * the signal trampolines is moving to the end of the structure so we can
+ * increase the alignment without breaking software compatibility.
+ */
#ifdef CONFIG_TRAD_SIGNALS
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 sigcontext sf_sc;
sigset_t sf_mask;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+ u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
+#endif
};
#endif
struct rt_sigframe {
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
struct siginfo rs_info;
struct ucontext rs_uc;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+ u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
+#endif
};
#ifdef CONFIG_TRAD_SIGNALS
-asmlinkage void sys_sigreturn(struct pt_regs regs)
+save_static_function(sys_sigreturn);
+__attribute_used__ noinline static void
+_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
{
- struct sigframe *frame;
+ struct sigframe __user *frame;
sigset_t blocked;
- 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)))
/*
* Don't let your children do this ...
*/
- if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
- do_syscall_trace();
__asm__ __volatile__(
"move\t$29, %0\n\t"
"j\tsyscall_exit"
badframe:
force_sig(SIGSEGV, current);
}
-#endif
+#endif /* CONFIG_TRAD_SIGNALS */
-asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
+save_static_function(sys_rt_sigreturn);
+__attribute_used__ noinline static 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;
- 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)))
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 ...
force_sig(SIGSEGV, current);
}
-inline int setup_sigcontext(struct pt_regs *regs, struct sigcontext *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) do { \
- 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_context(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);
-}
-
#ifdef CONFIG_TRAD_SIGNALS
-static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_frame(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
- */
- 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);
+ install_sigtramp(frame->sf_code, __NR_sigreturn);
err |= setup_sigcontext(regs, &frame->sf_sc);
err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
current->comm, current->pid,
frame, regs->cp0_epc, frame->regs[31]);
#endif
- return;
+ return 0;
give_sigsegv:
- if (signr == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
- force_sig(SIGSEGV, current);
+ force_sigsegv(signr, current);
+ return -EFAULT;
}
#endif
-static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_rt_frame(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
- */
- 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);
+ install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
/* 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);
current->comm, current->pid,
frame, regs->cp0_epc, regs->regs[31]);
#endif
- return;
+ return 0;
give_sigsegv:
- if (signr == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
- force_sig(SIGSEGV, current);
+ 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);
-
-static inline void handle_signal(unsigned long sig, siginfo_t *info,
- sigset_t *oldset, struct pt_regs *regs)
+static inline int handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
- struct k_sigaction *ka = ¤t->sighand->action[sig-1];
+ int ret;
switch(regs->regs[0]) {
case ERESTART_RESTARTBLOCK:
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 = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
else
- setup_frame(ka, regs, sig, oldset);
-#endif
+ ret = current->thread.abi->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->sighand->siglock);
- sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
+ 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);
- }
-}
+ 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;
+}
-asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
+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;
- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = ¤t->saved_sigmask;
+ else
oldset = ¤t->blocked;
- signr = get_signal_to_deliver(&info, regs, NULL);
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
- handle_signal(signr, &info, 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;
}
/*
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 4;
}
+ regs->regs[0] = 0; /* Don't deal with this again. */
}
- return 0;
-}
-extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
+ /*
+ * 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);
+ }
+}
/*
* 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;
- }
-#endif
- do_signal(oldset, regs);
- }
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ current->thread.abi->do_signal(regs);
}
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