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 <[email protected]>
Documentation/kernel-parameters.txt | 5 +++++
arch/i386/kernel/traps.c | 20 ++++++++++++++++----
2 files changed, 21 insertions(+), 4 deletions(-)
--- 2.6.20-rc6.1-32smp.orig/Documentation/kernel-parameters.txt
+++ 2.6.20-rc6.1-32smp/Documentation/kernel-parameters.txt
@@ -361,6 +361,11 @@ and is between 256 and 4096 characters.
clocksource is not available, it defaults to PIT.
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
enable_8254_timer
[IA32/X86_64] Disable/Enable interrupt 0 timer routing
--- 2.6.20-rc6.1-32smp.orig/arch/i386/kernel/traps.c
+++ 2.6.20-rc6.1-32smp/arch/i386/kernel/traps.c
@@ -94,6 +94,7 @@ asmlinkage void spurious_interrupt_bug(v
asmlinkage void machine_check(void);
int kstack_depth_to_print = 24;
+static unsigned int code_bytes = 64;
ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb)
@@ -324,7 +325,8 @@ void show_registers(struct pt_regs *regs
*/
if (in_kernel) {
u8 *eip;
- int code_bytes = 64;
+ unsigned int code_prologue = code_bytes * 43 / 64;
+ unsigned int code_len = code_bytes;
unsigned char c;
printk("\n" KERN_EMERG "Stack: ");
@@ -332,14 +334,14 @@ void show_registers(struct pt_regs *regs
printk(KERN_EMERG "Code: ");
- eip = (u8 *)regs->eip - 43;
+ eip = (u8 *)regs->eip - code_prologue;
if (eip < (u8 *)PAGE_OFFSET ||
probe_kernel_address(eip, c)) {
/* try starting at 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 ||
probe_kernel_address(eip, c)) {
printk(" Bad EIP value.");
@@ -1191,3 +1193,13 @@ static int __init kstack_setup(char *s)
return 1;
}
__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);
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