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Diffstat (limited to 'arch/x86/kernel/traps_32.c')
-rw-r--r--arch/x86/kernel/traps_32.c177
1 files changed, 88 insertions, 89 deletions
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index d7cc292691f..8a768973c4f 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
*
* Pentium III FXSR, SSE support
* Gareth Hughes <gareth@valinux.com>, May 2000
@@ -60,8 +61,6 @@
#include "mach_traps.h"
-int panic_on_unrecovered_nmi;
-
DECLARE_BITMAP(used_vectors, NR_VECTORS);
EXPORT_SYMBOL_GPL(used_vectors);
@@ -98,19 +97,22 @@ asmlinkage void alignment_check(void);
asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
+int panic_on_unrecovered_nmi;
int kstack_depth_to_print = 24;
static unsigned int code_bytes = 64;
+static int ignore_nmis;
+static int die_counter;
void printk_address(unsigned long address, int reliable)
{
#ifdef CONFIG_KALLSYMS
- char namebuf[KSYM_NAME_LEN];
unsigned long offset = 0;
unsigned long symsize;
const char *symname;
- char reliab[4] = "";
- char *delim = ":";
char *modname;
+ char *delim = ":";
+ char namebuf[KSYM_NAME_LEN];
+ char reliab[4] = "";
symname = kallsyms_lookup(address, &symsize, &offset,
&modname, namebuf);
@@ -130,22 +132,23 @@ void printk_address(unsigned long address, int reliable)
#endif
}
-static inline int valid_stack_ptr(struct thread_info *tinfo, void *p, unsigned size)
+static inline int valid_stack_ptr(struct thread_info *tinfo,
+ void *p, unsigned int size)
{
- return p > (void *)tinfo &&
- p <= (void *)tinfo + THREAD_SIZE - size;
+ void *t = tinfo;
+ return p > t && p <= t + THREAD_SIZE - size;
}
/* The form of the top of the frame on the stack */
struct stack_frame {
- struct stack_frame *next_frame;
- unsigned long return_address;
+ struct stack_frame *next_frame;
+ unsigned long return_address;
};
static inline unsigned long
print_context_stack(struct thread_info *tinfo,
- unsigned long *stack, unsigned long bp,
- const struct stacktrace_ops *ops, void *data)
+ unsigned long *stack, unsigned long bp,
+ const struct stacktrace_ops *ops, void *data)
{
struct stack_frame *frame = (struct stack_frame *)bp;
@@ -167,8 +170,6 @@ print_context_stack(struct thread_info *tinfo,
return bp;
}
-#define MSG(msg) ops->warning(data, msg)
-
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
@@ -178,7 +179,6 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
if (!stack) {
unsigned long dummy;
-
stack = &dummy;
if (task != current)
stack = (unsigned long *)task->thread.sp;
@@ -196,7 +196,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
}
#endif
- while (1) {
+ for (;;) {
struct thread_info *context;
context = (struct thread_info *)
@@ -248,10 +248,10 @@ static void print_trace_address(void *data, unsigned long addr, int reliable)
}
static const struct stacktrace_ops print_trace_ops = {
- .warning = print_trace_warning,
- .warning_symbol = print_trace_warning_symbol,
- .stack = print_trace_stack,
- .address = print_trace_address,
+ .warning = print_trace_warning,
+ .warning_symbol = print_trace_warning_symbol,
+ .stack = print_trace_stack,
+ .address = print_trace_address,
};
static void
@@ -351,15 +351,14 @@ void show_registers(struct pt_regs *regs)
printk(KERN_EMERG "Code: ");
ip = (u8 *)regs->ip - code_prologue;
- if (ip < (u8 *)PAGE_OFFSET ||
- probe_kernel_address(ip, c)) {
+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
/* try starting at EIP */
ip = (u8 *)regs->ip;
code_len = code_len - code_prologue + 1;
}
for (i = 0; i < code_len; i++, ip++) {
if (ip < (u8 *)PAGE_OFFSET ||
- probe_kernel_address(ip, c)) {
+ probe_kernel_address(ip, c)) {
printk(" Bad EIP value.");
break;
}
@@ -384,8 +383,6 @@ int is_valid_bugaddr(unsigned long ip)
return ud2 == 0x0b0f;
}
-static int die_counter;
-
int __kprobes __die(const char *str, struct pt_regs *regs, long err)
{
unsigned short ss;
@@ -402,26 +399,22 @@ int __kprobes __die(const char *str, struct pt_regs *regs, long err)
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
-
if (notify_die(DIE_OOPS, str, regs, err,
- current->thread.trap_no, SIGSEGV) != NOTIFY_STOP) {
-
- show_registers(regs);
- /* Executive summary in case the oops scrolled away */
- sp = (unsigned long) (&regs->sp);
- savesegment(ss, ss);
- if (user_mode(regs)) {
- sp = regs->sp;
- ss = regs->ss & 0xffff;
- }
- printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
- print_symbol("%s", regs->ip);
- printk(" SS:ESP %04x:%08lx\n", ss, sp);
+ current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+ return 1;
- return 0;
+ show_registers(regs);
+ /* Executive summary in case the oops scrolled away */
+ sp = (unsigned long) (&regs->sp);
+ savesegment(ss, ss);
+ if (user_mode(regs)) {
+ sp = regs->sp;
+ ss = regs->ss & 0xffff;
}
-
- return 1;
+ printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
+ print_symbol("%s", regs->ip);
+ printk(" SS:ESP %04x:%08lx\n", ss, sp);
+ return 0;
}
/*
@@ -546,7 +539,7 @@ void do_##name(struct pt_regs *regs, long error_code) \
{ \
trace_hardirqs_fixup(); \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
- == NOTIFY_STOP) \
+ == NOTIFY_STOP) \
return; \
do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \
}
@@ -562,7 +555,7 @@ void do_##name(struct pt_regs *regs, long error_code) \
info.si_code = sicode; \
info.si_addr = (void __user *)siaddr; \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
- == NOTIFY_STOP) \
+ == NOTIFY_STOP) \
return; \
do_trap(trapnr, signr, str, 0, regs, error_code, &info); \
}
@@ -571,7 +564,7 @@ void do_##name(struct pt_regs *regs, long error_code) \
void do_##name(struct pt_regs *regs, long error_code) \
{ \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
- == NOTIFY_STOP) \
+ == NOTIFY_STOP) \
return; \
do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \
}
@@ -586,27 +579,29 @@ void do_##name(struct pt_regs *regs, long error_code) \
info.si_addr = (void __user *)siaddr; \
trace_hardirqs_fixup(); \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
- == NOTIFY_STOP) \
+ == NOTIFY_STOP) \
return; \
do_trap(trapnr, signr, str, 1, regs, error_code, &info); \
}
-DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
+DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
#ifndef CONFIG_KPROBES
DO_VM86_ERROR(3, SIGTRAP, "int3", int3)
#endif
DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow)
DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds)
-DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
-DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
+DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
+DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
-DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
-DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
+DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
+DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0)
DO_ERROR_INFO(32, SIGILL, "iret exception", iret_error, ILL_BADSTK, 0, 1)
-void __kprobes do_general_protection(struct pt_regs *regs, long error_code)
+void __kprobes
+do_general_protection(struct pt_regs *regs, long error_code)
{
+ struct task_struct *tsk;
struct thread_struct *thread;
struct tss_struct *tss;
int cpu;
@@ -647,23 +642,24 @@ void __kprobes do_general_protection(struct pt_regs *regs, long error_code)
if (regs->flags & X86_VM_MASK)
goto gp_in_vm86;
+ tsk = current;
if (!user_mode(regs))
goto gp_in_kernel;
- current->thread.error_code = error_code;
- current->thread.trap_no = 13;
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
- if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) &&
- printk_ratelimit()) {
+ if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+ printk_ratelimit()) {
printk(KERN_INFO
- "%s[%d] general protection ip:%lx sp:%lx error:%lx",
- current->comm, task_pid_nr(current),
- regs->ip, regs->sp, error_code);
+ "%s[%d] general protection ip:%lx sp:%lx error:%lx",
+ tsk->comm, task_pid_nr(tsk),
+ regs->ip, regs->sp, error_code);
print_vma_addr(" in ", regs->ip);
printk("\n");
}
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV, tsk);
return;
gp_in_vm86:
@@ -672,14 +668,15 @@ gp_in_vm86:
return;
gp_in_kernel:
- if (!fixup_exception(regs)) {
- current->thread.error_code = error_code;
- current->thread.trap_no = 13;
- if (notify_die(DIE_GPF, "general protection fault", regs,
+ if (fixup_exception(regs))
+ return;
+
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
+ if (notify_die(DIE_GPF, "general protection fault", regs,
error_code, 13, SIGSEGV) == NOTIFY_STOP)
- return;
- die("general protection fault", regs, error_code);
- }
+ return;
+ die("general protection fault", regs, error_code);
}
static notrace __kprobes void
@@ -792,14 +789,17 @@ void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
{
unsigned char reason = 0;
+ int cpu;
+
+ cpu = smp_processor_id();
- /* Only the BSP gets external NMIs from the system: */
- if (!smp_processor_id())
+ /* Only the BSP gets external NMIs from the system. */
+ if (!cpu)
reason = get_nmi_reason();
if (!(reason & 0xc0)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
- == NOTIFY_STOP)
+ == NOTIFY_STOP)
return;
#ifdef CONFIG_X86_LOCAL_APIC
/*
@@ -808,7 +808,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
*/
if (nmi_watchdog_tick(regs, reason))
return;
- if (!do_nmi_callback(regs, smp_processor_id()))
+ if (!do_nmi_callback(regs, cpu))
unknown_nmi_error(reason, regs);
#else
unknown_nmi_error(reason, regs);
@@ -818,6 +818,8 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
}
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
+
+ /* AK: following checks seem to be broken on modern chipsets. FIXME */
if (reason & 0x80)
mem_parity_error(reason, regs);
if (reason & 0x40)
@@ -829,8 +831,6 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
reassert_nmi();
}
-static int ignore_nmis;
-
notrace __kprobes void do_nmi(struct pt_regs *regs, long error_code)
{
int cpu;
@@ -915,7 +915,7 @@ void __kprobes do_debug(struct pt_regs *regs, long error_code)
tsk->thread.debugctlmsr = 0;
if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
- SIGTRAP) == NOTIFY_STOP)
+ SIGTRAP) == NOTIFY_STOP)
return;
/* It's safe to allow irq's after DR6 has been saved */
if (regs->flags & X86_EFLAGS_IF)
@@ -976,9 +976,8 @@ clear_TF_reenable:
void math_error(void __user *ip)
{
struct task_struct *task;
- unsigned short cwd;
- unsigned short swd;
siginfo_t info;
+ unsigned short cwd, swd;
/*
* Save the info for the exception handler and clear the error.
@@ -997,7 +996,7 @@ void math_error(void __user *ip)
* C1 reg you need in case of a stack fault, 0x040 is the stack
* fault bit. We should only be taking one exception at a time,
* so if this combination doesn't produce any single exception,
- * then we have a bad program that isn't syncronizing its FPU usage
+ * then we have a bad program that isn't synchronizing its FPU usage
* and it will suffer the consequences since we won't be able to
* fully reproduce the context of the exception
*/
@@ -1006,7 +1005,7 @@ void math_error(void __user *ip)
switch (swd & ~cwd & 0x3f) {
case 0x000: /* No unmasked exception */
return;
- default: /* Multiple exceptions */
+ default: /* Multiple exceptions */
break;
case 0x001: /* Invalid Op */
/*
@@ -1042,8 +1041,8 @@ void do_coprocessor_error(struct pt_regs *regs, long error_code)
static void simd_math_error(void __user *ip)
{
struct task_struct *task;
- unsigned short mxcsr;
siginfo_t info;
+ unsigned short mxcsr;
/*
* Save the info for the exception handler and clear the error.
@@ -1198,16 +1197,16 @@ void __init trap_init(void)
early_iounmap(p, 4);
#endif
- set_trap_gate(0, &divide_error);
- set_intr_gate(1, &debug);
- set_intr_gate(2, &nmi);
- set_system_intr_gate(3, &int3); /* int3/4 can be called from all */
- set_system_gate(4, &overflow);
- set_trap_gate(5, &bounds);
- set_trap_gate(6, &invalid_op);
- set_trap_gate(7, &device_not_available);
- set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
- set_trap_gate(9, &coprocessor_segment_overrun);
+ set_trap_gate(0, &divide_error);
+ set_intr_gate(1, &debug);
+ set_intr_gate(2, &nmi);
+ set_system_intr_gate(3, &int3); /* int3 can be called from all */
+ set_system_gate(4, &overflow); /* int4 can be called from all */
+ set_trap_gate(5, &bounds);
+ set_trap_gate(6, &invalid_op);
+ set_trap_gate(7, &device_not_available);
+ set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
+ set_trap_gate(9, &coprocessor_segment_overrun);
set_trap_gate(10, &invalid_TSS);
set_trap_gate(11, &segment_not_present);
set_trap_gate(12, &stack_segment);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 07:18:39 +0000