1 files changed, 20 insertions, 7 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 0efad8aeb41a..af0d3f70a817 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -94,6 +94,7 @@ asmlinkage void spurious_interrupt_bug(void);
 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)
@@ -291,10 +292,11 @@ void show_registers(struct pt_regs *regs)
         int i;
         int in_kernel = 1;
         unsigned long esp;
-        unsigned short ss;
+        unsigned short ss, gs;
 
         esp = (unsigned long) (&regs->esp);
         savesegment(ss, ss);
+        savesegment(gs, gs);
         if (user_mode_vm(regs)) {
                 in_kernel = 0;
                 esp = regs->esp;
@@ -313,8 +315,8 @@ void show_registers(struct pt_regs *regs)
                 regs->eax, regs->ebx, regs->ecx, regs->edx);
         printk(KERN_EMERG "esi: %08lx   edi: %08lx   ebp: %08lx   esp: %08lx\n",
                 regs->esi, regs->edi, regs->ebp, esp);
-        printk(KERN_EMERG "ds: %04x   es: %04x   ss: %04x\n",
-                regs->xds & 0xffff, regs->xes & 0xffff, ss);
+        printk(KERN_EMERG "ds: %04x   es: %04x   fs: %04x  gs: %04x  ss: %04x\n",
+               regs->xds & 0xffff, regs->xes & 0xffff, regs->xfs & 0xffff, gs, ss);
         printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)",
                 TASK_COMM_LEN, current->comm, current->pid,
                 current_thread_info(), current, current->thread_info);
@@ -324,7 +326,8 @@ 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 +335,14 @@ 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 +1194,13 @@ 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);