i386: print better early fault info

improve early fault output.

old format:

 Int 14: CR2 010001e3  err 00000002  EIP c011f2f9  CS 00000060  flags 00010046
 Stack: c073695e c0791c10 00000000 ffffffff 00000000 01000000 00001000 c0791c10

new format:

 BUG: Int 14: CR2 010001e3
      EDI c1000000  ESI c0693c10  EBP c0637f9c  ESP c0637f08
      EBX 00000000  EDX 0000000e  ECX 00000000  EAX 010001e3
      err 00000002  EIP c0123119   CS 00000060  flg 00010046
 Stack: c064d589 c0693000 00000000 c0637f60 00c001e3 01000000 00038000 00000163
        00000000 00000163 00000000 ffffffff 00038000 00000000 00000000 00001000
        00001000 00000000 c0637f88 c06509be c0a2ae60 00001000 00001000 00000000

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 10 insertions, 2 deletions

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 0fa8a972a679..39677965e161 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -452,6 +452,7 @@ early_page_fault:
 early_fault:
         cld
 #ifdef CONFIG_PRINTK
+        pusha
         movl $(__KERNEL_DS),%eax
         movl %eax,%ds
         movl %eax,%es
@@ -543,8 +544,15 @@ int_msg:
         .asciz "Unknown interrupt or fault at EIP %p %p %p\n"
 
 fault_msg:
-        .ascii "Int %d: CR2 %p  err %p  EIP %p  CS %p  flags %p\n"
-        .asciz "Stack: %p %p %p %p %p %p %p %p\n"
+        .ascii                                                          \
+/* fault info: */       "BUG: Int %d: CR2 %p\n"                         \
+/* pusha regs: */       "     EDI %p  ESI %p  EBP %p  ESP %p\n"         \
+                        "     EBX %p  EDX %p  ECX %p  EAX %p\n"         \
+/* fault frame: */      "     err %p  EIP %p   CS %p  flg %p\n"         \
+                                                                        \
+                        "Stack: %p %p %p %p %p %p %p %p\n"              \
+                        "       %p %p %p %p %p %p %p %p\n"              \
+                        "       %p %p %p %p %p %p %p %p\n"
 
 #include "../../x86/xen/xen-head.S"