diff options
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 9f156c84195d..1702922ebd9c 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -810,7 +810,7 @@ NOKPROBE_SYMBOL(do_debug); * the correct behaviour even in the presence of the asynchronous * IRQ13 behaviour */ -static void math_error(struct pt_regs *regs, int error_code, int trapnr) +static void math_error(struct pt_regs *regs, int trapnr) { struct task_struct *task = current; struct fpu *fpu = &task->thread.fpu; @@ -821,15 +821,15 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr) cond_local_irq_enable(regs); if (!user_mode(regs)) { - if (fixup_exception(regs, trapnr, error_code, 0)) + if (fixup_exception(regs, trapnr, 0, 0)) goto exit; - task->thread.error_code = error_code; + task->thread.error_code = 0; task->thread.trap_nr = trapnr; - if (notify_die(DIE_TRAP, str, regs, error_code, - trapnr, SIGFPE) != NOTIFY_STOP) - die(str, regs, error_code); + if (notify_die(DIE_TRAP, str, regs, 0, trapnr, + SIGFPE) != NOTIFY_STOP) + die(str, regs, 0); goto exit; } @@ -839,7 +839,7 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr) fpu__save(fpu); task->thread.trap_nr = trapnr; - task->thread.error_code = error_code; + task->thread.error_code = 0; si_code = fpu__exception_code(fpu, trapnr); /* Retry when we get spurious exceptions: */ @@ -854,14 +854,19 @@ exit: DEFINE_IDTENTRY(exc_coprocessor_error) { - math_error(regs, 0, X86_TRAP_MF); + math_error(regs, X86_TRAP_MF); } -dotraplinkage void -do_simd_coprocessor_error(struct pt_regs *regs, long error_code) +DEFINE_IDTENTRY(exc_simd_coprocessor_error) { - RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU"); - math_error(regs, error_code, X86_TRAP_XF); + if (IS_ENABLED(CONFIG_X86_INVD_BUG)) { + /* AMD 486 bug: INVD in CPL 0 raises #XF instead of #GP */ + if (!static_cpu_has(X86_FEATURE_XMM)) { + __exc_general_protection(regs, 0); + return; + } + } + math_error(regs, X86_TRAP_XF); } DEFINE_IDTENTRY(exc_spurious_interrupt_bug) |