diff options
Diffstat (limited to 'arch/mips/kernel/traps.c')
| -rw-r--r-- | arch/mips/kernel/traps.c | 73 |
1 files changed, 24 insertions, 49 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 18f56a9..493cb29 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -610,16 +610,6 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) if (fcr31 & FPU_CSR_UNI_X) { int sig; - preempt_disable(); - -#ifdef CONFIG_PREEMPT - if (!is_fpu_owner()) { - /* We might lose fpu before disabling preempt... */ - own_fpu(); - BUG_ON(!used_math()); - restore_fp(current); - } -#endif /* * Unimplemented operation exception. If we've got the full * software emulator on-board, let's use it... @@ -630,18 +620,12 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) * register operands before invoking the emulator, which seems * a bit extreme for what should be an infrequent event. */ - save_fp(current); /* Ensure 'resume' not overwrite saved fp context again. */ - lose_fpu(); - - preempt_enable(); + lose_fpu(1); /* Run the emulator */ sig = fpu_emulator_cop1Handler (regs, ¤t->thread.fpu, 1); - preempt_disable(); - - own_fpu(); /* Using the FPU again. */ /* * We can't allow the emulated instruction to leave any of * the cause bit set in $fcr31. @@ -649,9 +633,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X; /* Restore the hardware register state */ - restore_fp(current); - - preempt_enable(); + own_fpu(1); /* Using the FPU again. */ /* If something went wrong, signal */ if (sig) @@ -668,7 +650,7 @@ asmlinkage void do_bp(struct pt_regs *regs) unsigned int opcode, bcode; siginfo_t info; - if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) goto out_sigsegv; /* @@ -718,7 +700,7 @@ asmlinkage void do_tr(struct pt_regs *regs) unsigned int opcode, tcode = 0; siginfo_t info; - if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) goto out_sigsegv; /* Immediate versions don't provide a code. */ @@ -791,21 +773,15 @@ asmlinkage void do_cpu(struct pt_regs *regs) break; case 1: - preempt_disable(); - - own_fpu(); - if (used_math()) { /* Using the FPU again. */ - restore_fp(current); - } else { /* First time FPU user. */ + if (used_math()) /* Using the FPU again. */ + own_fpu(1); + else { /* First time FPU user. */ init_fpu(); set_used_math(); } - if (cpu_has_fpu) { - preempt_enable(); - } else { + if (!raw_cpu_has_fpu) { int sig; - preempt_enable(); sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 0); if (sig) @@ -846,7 +822,6 @@ asmlinkage void do_cpu(struct pt_regs *regs) case 2: case 3: - die_if_kernel("do_cpu invoked from kernel context!", regs); break; } @@ -1259,26 +1234,26 @@ static inline void mips_srs_init(void) /* * This is used by native signal handling */ -asmlinkage int (*save_fp_context)(struct sigcontext *sc); -asmlinkage int (*restore_fp_context)(struct sigcontext *sc); +asmlinkage int (*save_fp_context)(struct sigcontext __user *sc); +asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc); -extern asmlinkage int _save_fp_context(struct sigcontext *sc); -extern asmlinkage int _restore_fp_context(struct sigcontext *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 *sc); -extern asmlinkage int fpu_emulator_restore_context(struct sigcontext *sc); +extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); +extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); #ifdef CONFIG_SMP -static int smp_save_fp_context(struct sigcontext *sc) +static int smp_save_fp_context(struct sigcontext __user *sc) { - return cpu_has_fpu + return raw_cpu_has_fpu ? _save_fp_context(sc) : fpu_emulator_save_context(sc); } -static int smp_restore_fp_context(struct sigcontext *sc) +static int smp_restore_fp_context(struct sigcontext __user *sc) { - return cpu_has_fpu + return raw_cpu_has_fpu ? _restore_fp_context(sc) : fpu_emulator_restore_context(sc); } @@ -1306,14 +1281,14 @@ static inline void signal_init(void) /* * This is used by 32-bit signal stuff on the 64-bit kernel */ -asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc); -asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc); +asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc); +asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc); -extern asmlinkage int _save_fp_context32(struct sigcontext32 *sc); -extern asmlinkage int _restore_fp_context32(struct sigcontext32 *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 *sc); -extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 *sc); +extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc); +extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc); static inline void signal32_init(void) { |