summaryrefslogtreecommitdiff
path: root/arch/mips/kernel/signal32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/kernel/signal32.c')
-rw-r--r--arch/mips/kernel/signal32.c207
1 files changed, 11 insertions, 196 deletions
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 5d7f26349..f7e89524e 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -36,12 +36,6 @@
#include "signal-common.h"
-static int (*save_fp_context32)(struct sigcontext32 __user *sc);
-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);
-
/*
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
*/
@@ -74,99 +68,11 @@ struct rt_sigframe32 {
struct ucontext32 rs_uc;
};
-/*
- * 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;
-}
-
-/*
- * sigcontext handlers
- */
-static int protected_save_fp_context32(struct sigcontext32 __user *sc)
-{
- int err;
- while (1) {
- lock_fpu_owner();
- if (is_fpu_owner()) {
- err = save_fp_context32(sc);
- unlock_fpu_owner();
- } else {
- unlock_fpu_owner();
- err = copy_fp_to_sigcontext32(sc);
- }
- 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_context32(struct sigcontext32 __user *sc)
-{
- int err, tmp __maybe_unused;
- while (1) {
- lock_fpu_owner();
- if (is_fpu_owner()) {
- err = restore_fp_context32(sc);
- unlock_fpu_owner();
- } else {
- unlock_fpu_owner();
- err = copy_fp_from_sigcontext32(sc);
- }
- 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;
-}
-
static int setup_sigcontext32(struct pt_regs *regs,
struct sigcontext32 __user *sc)
{
int err = 0;
int i;
- u32 used_math;
err |= __put_user(regs->cp0_epc, &sc->sc_pc);
@@ -186,35 +92,18 @@ static int setup_sigcontext32(struct pt_regs *regs,
err |= __put_user(mflo3(), &sc->sc_lo3);
}
- used_math = !!used_math();
- err |= __put_user(used_math, &sc->sc_used_math);
+ /*
+ * Save FPU state to signal context. Signal handler
+ * will "inherit" current FPU state.
+ */
+ err |= protected_save_fp_context(sc);
- if (used_math) {
- /*
- * Save FPU state to signal context. Signal handler
- * will "inherit" current FPU state.
- */
- err |= protected_save_fp_context32(sc);
- }
return err;
}
-static int
-check_and_restore_fp_context32(struct sigcontext32 __user *sc)
-{
- int err, sig;
-
- err = sig = fpcsr_pending(&sc->sc_fpc_csr);
- if (err > 0)
- err = 0;
- err |= protected_restore_fp_context32(sc);
- return err ?: sig;
-}
-
static int restore_sigcontext32(struct pt_regs *regs,
struct sigcontext32 __user *sc)
{
- u32 used_math;
int err = 0;
s32 treg;
int i;
@@ -238,70 +127,7 @@ static int restore_sigcontext32(struct pt_regs *regs,
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_context32(sc);
- } else {
- /* signal handler may have used FPU. Give it up. */
- lose_fpu(0);
- }
-
- return err;
-}
-
-/*
- *
- */
-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;
+ return err ?: protected_restore_fp_context(sc);
}
/*
@@ -585,20 +411,9 @@ struct mips_abi mips_abi_32 = {
.setup_rt_frame = setup_rt_frame_32,
.rt_signal_return_offset =
offsetof(struct mips_vdso, o32_rt_signal_trampoline),
- .restart = __NR_O32_restart_syscall
-};
-
-static int signal32_init(void)
-{
- if (cpu_has_fpu) {
- save_fp_context32 = _save_fp_context32;
- restore_fp_context32 = _restore_fp_context32;
- } else {
- save_fp_context32 = copy_fp_to_sigcontext32;
- restore_fp_context32 = copy_fp_from_sigcontext32;
- }
+ .restart = __NR_O32_restart_syscall,
- return 0;
-}
-
-arch_initcall(signal32_init);
+ .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
+ .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
+ .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
+};
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-26 07:31:28 +0000