diff options
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 80 |
1 files changed, 37 insertions, 43 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 04d242ab016..98c2d055284 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -20,7 +20,6 @@ #include <linux/module.h> #include <linux/ptrace.h> #include <linux/string.h> -#include <linux/unwind.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/kexec.h> @@ -51,7 +50,6 @@ #include <asm/debugreg.h> #include <asm/atomic.h> #include <asm/system.h> -#include <asm/unwind.h> #include <asm/traps.h> #include <asm/desc.h> #include <asm/i387.h> @@ -65,16 +63,10 @@ #else #include <asm/processor-flags.h> #include <asm/arch_hooks.h> -#include <asm/nmi.h> -#include <asm/smp.h> -#include <asm/io.h> #include <asm/traps.h> #include "cpu/mcheck/mce.h" -DECLARE_BITMAP(used_vectors, NR_VECTORS); -EXPORT_SYMBOL_GPL(used_vectors); - asmlinkage int system_call(void); /* Do we ignore FPU interrupts ? */ @@ -89,6 +81,9 @@ gate_desc idt_table[256] __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, }; #endif +DECLARE_BITMAP(used_vectors, NR_VECTORS); +EXPORT_SYMBOL_GPL(used_vectors); + static int ignore_nmis; static inline void conditional_sti(struct pt_regs *regs) @@ -292,8 +287,10 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) tsk->thread.error_code = error_code; tsk->thread.trap_no = 8; - /* This is always a kernel trap and never fixable (and thus must - never return). */ + /* + * This is always a kernel trap and never fixable (and thus must + * never return). + */ for (;;) die(str, regs, error_code); } @@ -481,11 +478,7 @@ do_nmi(struct pt_regs *regs, long error_code) { nmi_enter(); -#ifdef CONFIG_X86_32 - { int cpu; cpu = smp_processor_id(); ++nmi_count(cpu); } -#else - add_pda(__nmi_count, 1); -#endif + inc_irq_stat(__nmi_count); if (!ignore_nmis) default_do_nmi(regs); @@ -524,9 +517,11 @@ dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code) } #ifdef CONFIG_X86_64 -/* Help handler running on IST stack to switch back to user stack - for scheduling or signal handling. The actual stack switch is done in - entry.S */ +/* + * Help handler running on IST stack to switch back to user stack + * for scheduling or signal handling. The actual stack switch is done in + * entry.S + */ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) { struct pt_regs *regs = eregs; @@ -536,8 +531,10 @@ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) /* Exception from user space */ else if (user_mode(eregs)) regs = task_pt_regs(current); - /* Exception from kernel and interrupts are enabled. Move to - kernel process stack. */ + /* + * Exception from kernel and interrupts are enabled. Move to + * kernel process stack. + */ else if (eregs->flags & X86_EFLAGS_IF) regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); if (eregs != regs) @@ -664,7 +661,7 @@ void math_error(void __user *ip) { struct task_struct *task; siginfo_t info; - unsigned short cwd, swd; + unsigned short cwd, swd, err; /* * Save the info for the exception handler and clear the error. @@ -675,7 +672,6 @@ void math_error(void __user *ip) task->thread.error_code = 0; info.si_signo = SIGFPE; info.si_errno = 0; - info.si_code = __SI_FAULT; info.si_addr = ip; /* * (~cwd & swd) will mask out exceptions that are not set to unmasked @@ -689,34 +685,30 @@ void math_error(void __user *ip) */ cwd = get_fpu_cwd(task); swd = get_fpu_swd(task); - switch (swd & ~cwd & 0x3f) { - case 0x000: /* No unmasked exception */ -#ifdef CONFIG_X86_32 - return; -#endif - default: /* Multiple exceptions */ - break; - case 0x001: /* Invalid Op */ + + err = swd & ~cwd; + + if (err & 0x001) { /* Invalid op */ /* * swd & 0x240 == 0x040: Stack Underflow * swd & 0x240 == 0x240: Stack Overflow * User must clear the SF bit (0x40) if set */ info.si_code = FPE_FLTINV; - break; - case 0x002: /* Denormalize */ - case 0x010: /* Underflow */ - info.si_code = FPE_FLTUND; - break; - case 0x004: /* Zero Divide */ + } else if (err & 0x004) { /* Divide by Zero */ info.si_code = FPE_FLTDIV; - break; - case 0x008: /* Overflow */ + } else if (err & 0x008) { /* Overflow */ info.si_code = FPE_FLTOVF; - break; - case 0x020: /* Precision */ + } else if (err & 0x012) { /* Denormal, Underflow */ + info.si_code = FPE_FLTUND; + } else if (err & 0x020) { /* Precision */ info.si_code = FPE_FLTRES; - break; + } else { + /* + * If we're using IRQ 13, or supposedly even some trap 16 + * implementations, it's possible we get a spurious trap... + */ + return; /* Spurious trap, no error */ } force_sig_info(SIGFPE, &info, task); } @@ -949,9 +941,7 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code) void __init trap_init(void) { -#ifdef CONFIG_X86_32 int i; -#endif #ifdef CONFIG_EISA void __iomem *p = early_ioremap(0x0FFFD9, 4); @@ -1008,11 +998,15 @@ void __init trap_init(void) } set_system_trap_gate(SYSCALL_VECTOR, &system_call); +#endif /* Reserve all the builtin and the syscall vector: */ for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) set_bit(i, used_vectors); +#ifdef CONFIG_X86_64 + set_bit(IA32_SYSCALL_VECTOR, used_vectors); +#else set_bit(SYSCALL_VECTOR, used_vectors); #endif /* |