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Diffstat (limited to 'arch/mips/kernel/signal.c')
-rw-r--r--arch/mips/kernel/signal.c117
1 files changed, 98 insertions, 19 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 95b019d92f5..9e60d117e41 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -6,8 +6,10 @@
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1994 - 2000 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2014, Imagination Technologies Ltd.
*/
#include <linux/cache.h>
+#include <linux/context_tracking.h>
#include <linux/irqflags.h>
#include <linux/sched.h>
#include <linux/mm.h>
@@ -35,6 +37,7 @@
#include <asm/war.h>
#include <asm/vdso.h>
#include <asm/dsp.h>
+#include <asm/inst.h>
#include "signal-common.h"
@@ -44,9 +47,6 @@ static int (*restore_fp_context)(struct sigcontext __user *sc);
extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
-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 */
@@ -62,16 +62,55 @@ struct rt_sigframe {
};
/*
+ * Thread saved context copy to/from a signal context presumed to be on the
+ * user stack, and therefore accessed with appropriate macros from uaccess.h.
+ */
+static int copy_fp_to_sigcontext(struct sigcontext __user *sc)
+{
+ int i;
+ int err = 0;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |=
+ __put_user(get_fpr64(&current->thread.fpu.fpr[i], 0),
+ &sc->sc_fpregs[i]);
+ }
+ err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
+
+ return err;
+}
+
+static int copy_fp_from_sigcontext(struct sigcontext __user *sc)
+{
+ int i;
+ int err = 0;
+ u64 fpr_val;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
+ set_fpr64(&current->thread.fpu.fpr[i], 0, fpr_val);
+ }
+ err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
+
+ return err;
+}
+
+/*
* Helper routines
*/
static int protected_save_fp_context(struct sigcontext __user *sc)
{
int err;
+#ifndef CONFIG_EVA
while (1) {
lock_fpu_owner();
- own_fpu_inatomic(1);
- err = save_fp_context(sc); /* this might fail */
- unlock_fpu_owner();
+ if (is_fpu_owner()) {
+ err = save_fp_context(sc);
+ unlock_fpu_owner();
+ } else {
+ unlock_fpu_owner();
+ err = copy_fp_to_sigcontext(sc);
+ }
if (likely(!err))
break;
/* touch the sigcontext and try again */
@@ -81,17 +120,30 @@ static int protected_save_fp_context(struct sigcontext __user *sc)
if (err)
break; /* really bad sigcontext */
}
+#else
+ /*
+ * EVA does not have FPU EVA instructions so saving fpu context directly
+ * does not work.
+ */
+ lose_fpu(1);
+ err = save_fp_context(sc); /* this might fail */
+#endif
return err;
}
static int protected_restore_fp_context(struct sigcontext __user *sc)
{
int err, tmp __maybe_unused;
+#ifndef CONFIG_EVA
while (1) {
lock_fpu_owner();
- own_fpu_inatomic(0);
- err = restore_fp_context(sc); /* this might fail */
- unlock_fpu_owner();
+ if (is_fpu_owner()) {
+ err = restore_fp_context(sc);
+ unlock_fpu_owner();
+ } else {
+ unlock_fpu_owner();
+ err = copy_fp_from_sigcontext(sc);
+ }
if (likely(!err))
break;
/* touch the sigcontext and try again */
@@ -101,6 +153,14 @@ static int protected_restore_fp_context(struct sigcontext __user *sc)
if (err)
break; /* really bad sigcontext */
}
+#else
+ /*
+ * EVA does not have FPU EVA instructions so restoring fpu context
+ * directly does not work.
+ */
+ lose_fpu(0);
+ err = restore_fp_context(sc); /* this might fail */
+#endif
return err;
}
@@ -412,7 +472,7 @@ give_sigsegv:
#endif
static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
- struct pt_regs *regs, int signr, sigset_t *set,
+ struct pt_regs *regs, int signr, sigset_t *set,
siginfo_t *info)
{
struct rt_sigframe __user *frame;
@@ -425,7 +485,7 @@ static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
/* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info);
- /* Create the ucontext. */
+ /* Create the ucontext. */
err |= __put_user(0, &frame->rs_uc.uc_flags);
err |= __put_user(NULL, &frame->rs_uc.uc_link);
err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
@@ -468,7 +528,7 @@ struct mips_abi mips_abi = {
.setup_frame = setup_frame,
.signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
#endif
- .setup_rt_frame = setup_rt_frame,
+ .setup_rt_frame = setup_rt_frame,
.rt_signal_return_offset =
offsetof(struct mips_vdso, rt_signal_trampoline),
.restart = __NR_restart_syscall
@@ -480,7 +540,15 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
sigset_t *oldset = sigmask_to_save();
int ret;
struct mips_abi *abi = current->thread.abi;
+#ifdef CONFIG_CPU_MICROMIPS
+ void *vdso;
+ unsigned int tmp = (unsigned int)current->mm->context.vdso;
+
+ set_isa16_mode(tmp);
+ vdso = (void *)tmp;
+#else
void *vdso = current->mm->context.vdso;
+#endif
if (regs->regs[0]) {
switch(regs->regs[2]) {
@@ -500,7 +568,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
regs->cp0_epc -= 4;
}
- regs->regs[0] = 0; /* Don't deal with this again. */
+ regs->regs[0] = 0; /* Don't deal with this again. */
}
if (sig_uses_siginfo(ka))
@@ -524,7 +592,7 @@ static void do_signal(struct pt_regs *regs)
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
- /* Whee! Actually deliver the signal. */
+ /* Whee! Actually deliver the signal. */
handle_signal(signr, &info, &ka, regs);
return;
}
@@ -545,7 +613,7 @@ static void do_signal(struct pt_regs *regs)
regs->cp0_epc -= 4;
break;
}
- regs->regs[0] = 0; /* Don't deal with this again. */
+ regs->regs[0] = 0; /* Don't deal with this again. */
}
/*
@@ -564,6 +632,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
{
local_irq_enable();
+ user_exit();
+
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
@@ -572,26 +642,31 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
}
+
+ user_enter();
}
#ifdef CONFIG_SMP
+#ifndef CONFIG_EVA
static int smp_save_fp_context(struct sigcontext __user *sc)
{
return raw_cpu_has_fpu
? _save_fp_context(sc)
- : fpu_emulator_save_context(sc);
+ : copy_fp_to_sigcontext(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);
+ : copy_fp_from_sigcontext(sc);
}
+#endif /* CONFIG_EVA */
#endif
static int signal_setup(void)
{
+#ifndef CONFIG_EVA
#ifdef CONFIG_SMP
/* For now just do the cpu_has_fpu check when the functions are invoked */
save_fp_context = smp_save_fp_context;
@@ -601,9 +676,13 @@ static int signal_setup(void)
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;
+ save_fp_context = copy_fp_from_sigcontext;
+ restore_fp_context = copy_fp_to_sigcontext;
}
+#endif /* CONFIG_SMP */
+#else
+ save_fp_context = copy_fp_from_sigcontext;;
+ restore_fp_context = copy_fp_to_sigcontext;
#endif
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-08 23:57:34 +0000