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[PATCH] i386: add option to show more code in oops reports

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Sometimes developers need to see more object code in an oops report,
e.g. when kernel may be corrupted at runtime.

Add the "code_bytes" option for this.

Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Chuck Ebbert 2007-02-13 13:26:25 +01:00 committed by Andi Kleen
parent 8469adde59
commit 86c4183742
2 changed files with 21 additions and 4 deletions
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5
Documentation/kernel-parameters.txt
View File

@ -364,6 +364,11 @@ and is between 256 and 4096 characters. It is defined in the file
clocksource is not available, it defaults to PIT. clocksource is not available, it defaults to PIT.
Format: { pit | tsc | cyclone | pmtmr } Format: { pit | tsc | cyclone | pmtmr }
code_bytes [IA32] How many bytes of object code to print in an
oops report.
Range: 0 - 8192
Default: 64
disable_8254_timer disable_8254_timer
enable_8254_timer enable_8254_timer
[IA32/X86_64] Disable/Enable interrupt 0 timer routing [IA32/X86_64] Disable/Enable interrupt 0 timer routing

20
arch/i386/kernel/traps.c
View File

@ -94,6 +94,7 @@ asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void); asmlinkage void machine_check(void);
int kstack_depth_to_print = 24; int kstack_depth_to_print = 24;
static unsigned int code_bytes = 64;
ATOMIC_NOTIFIER_HEAD(i386die_chain); ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb) int register_die_notifier(struct notifier_block *nb)
@ -325,7 +326,8 @@ void show_registers(struct pt_regs *regs)
*/ */
if (in_kernel) { if (in_kernel) {
u8 *eip; u8 *eip;
int code_bytes = 64; unsigned int code_prologue = code_bytes * 43 / 64;
unsigned int code_len = code_bytes;
unsigned char c; unsigned char c;
printk("\n" KERN_EMERG "Stack: "); printk("\n" KERN_EMERG "Stack: ");
@ -333,14 +335,14 @@ void show_registers(struct pt_regs *regs)
printk(KERN_EMERG "Code: "); printk(KERN_EMERG "Code: ");
eip = (u8 *)regs->eip - 43; eip = (u8 *)regs->eip - code_prologue;
if (eip < (u8 *)PAGE_OFFSET || if (eip < (u8 *)PAGE_OFFSET ||
probe_kernel_address(eip, c)) { probe_kernel_address(eip, c)) {
/* try starting at EIP */ /* try starting at EIP */
eip = (u8 *)regs->eip; eip = (u8 *)regs->eip;
code_bytes = 32; code_len = code_len - code_prologue + 1;
} }
for (i = 0; i < code_bytes; i++, eip++) { for (i = 0; i < code_len; i++, eip++) {
if (eip < (u8 *)PAGE_OFFSET || if (eip < (u8 *)PAGE_OFFSET ||
probe_kernel_address(eip, c)) { probe_kernel_address(eip, c)) {
printk(" Bad EIP value."); printk(" Bad EIP value.");
@ -1192,3 +1194,13 @@ static int __init kstack_setup(char *s)
return 1; return 1;
} }
__setup("kstack=", kstack_setup); __setup("kstack=", kstack_setup);
static int __init code_bytes_setup(char *s)
{
code_bytes = simple_strtoul(s, NULL, 0);
if (code_bytes > 8192)
code_bytes = 8192;
return 1;
}
__setup("code_bytes=", code_bytes_setup);