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-rw-r--r--arch/mips/kernel/signal32.c137
1 files changed, 117 insertions, 20 deletions
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 3d60f7750fa..299f956e4db 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -30,6 +30,7 @@
#include <asm/sim.h>
#include <asm/ucontext.h>
#include <asm/fpu.h>
+#include <asm/msa.h>
#include <asm/war.h>
#include <asm/vdso.h>
#include <asm/dsp.h>
@@ -42,8 +43,8 @@ static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
-extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
-extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);
+extern asmlinkage int _save_msa_context32(struct sigcontext32 __user *sc);
+extern asmlinkage int _restore_msa_context32(struct sigcontext32 __user *sc);
/*
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
@@ -78,17 +79,96 @@ struct rt_sigframe32 {
};
/*
+ * 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_sigcontext32(struct sigcontext32 __user *sc)
+{
+ int i;
+ int err = 0;
+ int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
+
+ for (i = 0; i < NUM_FPU_REGS; i += inc) {
+ 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_sigcontext32(struct sigcontext32 __user *sc)
+{
+ int i;
+ int err = 0;
+ int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
+ u64 fpr_val;
+
+ for (i = 0; i < NUM_FPU_REGS; i += inc) {
+ 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;
+}
+
+/*
+ * These functions will save only the upper 64 bits of the vector registers,
+ * since the lower 64 bits have already been saved as the scalar FP context.
+ */
+static int copy_msa_to_sigcontext32(struct sigcontext32 __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], 1),
+ &sc->sc_msaregs[i]);
+ }
+ err |= __put_user(current->thread.fpu.msacsr, &sc->sc_msa_csr);
+
+ return err;
+}
+
+static int copy_msa_from_sigcontext32(struct sigcontext32 __user *sc)
+{
+ int i;
+ int err = 0;
+ u64 val;
+
+ for (i = 0; i < NUM_FPU_REGS; i++) {
+ err |= __get_user(val, &sc->sc_msaregs[i]);
+ set_fpr64(&current->thread.fpu.fpr[i], 1, val);
+ }
+ err |= __get_user(current->thread.fpu.msacsr, &sc->sc_msa_csr);
+
+ return err;
+}
+
+/*
* sigcontext handlers
*/
-static int protected_save_fp_context32(struct sigcontext32 __user *sc)
+static int protected_save_fp_context32(struct sigcontext32 __user *sc,
+ unsigned used_math)
{
int err;
+ bool save_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
while (1) {
lock_fpu_owner();
- err = own_fpu_inatomic(1);
- if (!err)
- err = save_fp_context32(sc); /* this might fail */
- unlock_fpu_owner();
+ if (is_fpu_owner()) {
+ err = save_fp_context32(sc);
+ if (save_msa && !err)
+ err = _save_msa_context32(sc);
+ unlock_fpu_owner();
+ } else {
+ unlock_fpu_owner();
+ err = copy_fp_to_sigcontext32(sc);
+ if (save_msa && !err)
+ err = copy_msa_to_sigcontext32(sc);
+ }
if (likely(!err))
break;
/* touch the sigcontext and try again */
@@ -101,15 +181,29 @@ static int protected_save_fp_context32(struct sigcontext32 __user *sc)
return err;
}
-static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
+static int protected_restore_fp_context32(struct sigcontext32 __user *sc,
+ unsigned used_math)
{
int err, tmp __maybe_unused;
+ bool restore_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
while (1) {
lock_fpu_owner();
- err = own_fpu_inatomic(0);
- if (!err)
- err = restore_fp_context32(sc); /* this might fail */
- unlock_fpu_owner();
+ if (is_fpu_owner()) {
+ err = restore_fp_context32(sc);
+ if (restore_msa && !err) {
+ enable_msa();
+ err = _restore_msa_context32(sc);
+ } else {
+ /* signal handler may have used MSA */
+ disable_msa();
+ }
+ unlock_fpu_owner();
+ } else {
+ unlock_fpu_owner();
+ err = copy_fp_from_sigcontext32(sc);
+ if (restore_msa && !err)
+ err = copy_msa_from_sigcontext32(sc);
+ }
if (likely(!err))
break;
/* touch the sigcontext and try again */
@@ -147,7 +241,8 @@ static int setup_sigcontext32(struct pt_regs *regs,
err |= __put_user(mflo3(), &sc->sc_lo3);
}
- used_math = !!used_math();
+ used_math = used_math() ? USEDMATH_FP : 0;
+ used_math |= thread_msa_context_live() ? USEDMATH_MSA : 0;
err |= __put_user(used_math, &sc->sc_used_math);
if (used_math) {
@@ -155,20 +250,21 @@ static int setup_sigcontext32(struct pt_regs *regs,
* Save FPU state to signal context. Signal handler
* will "inherit" current FPU state.
*/
- err |= protected_save_fp_context32(sc);
+ err |= protected_save_fp_context32(sc, used_math);
}
return err;
}
static int
-check_and_restore_fp_context32(struct sigcontext32 __user *sc)
+check_and_restore_fp_context32(struct sigcontext32 __user *sc,
+ unsigned used_math)
{
int err, sig;
err = sig = fpcsr_pending(&sc->sc_fpc_csr);
if (err > 0)
err = 0;
- err |= protected_restore_fp_context32(sc);
+ err |= protected_restore_fp_context32(sc, used_math);
return err ?: sig;
}
@@ -205,9 +301,10 @@ static int restore_sigcontext32(struct pt_regs *regs,
if (used_math) {
/* restore fpu context if we have used it before */
if (!err)
- err = check_and_restore_fp_context32(sc);
+ err = check_and_restore_fp_context32(sc, used_math);
} else {
- /* signal handler may have used FPU. Give it up. */
+ /* signal handler may have used FPU or MSA. Disable them. */
+ disable_msa();
lose_fpu(0);
}
@@ -566,8 +663,8 @@ static int signal32_init(void)
save_fp_context32 = _save_fp_context32;
restore_fp_context32 = _restore_fp_context32;
} else {
- save_fp_context32 = fpu_emulator_save_context32;
- restore_fp_context32 = fpu_emulator_restore_context32;
+ save_fp_context32 = copy_fp_to_sigcontext32;
+ restore_fp_context32 = copy_fp_from_sigcontext32;
}
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-30 11:48:03 +0000