[Xen-changelog] [xen-unstable] x86: early exception enhancement

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1182355548 -3600
# Node ID f50f0ec7dd2c4cdc6313c357a6fd74eeea60b2a2
# Parent  9c6076750685f9635cb30431c996cffb33dd5535
x86: early exception enhancement

In order to at least have some minimal debuging capabilities when Xen
crashes really early, dump out registers and stack contents in a raw
form.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 xen/arch/x86/boot/x86_32.S |   16 +++++++++++++++-
 xen/arch/x86/boot/x86_64.S |   15 +++++++++++++--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff -r 9c6076750685 -r f50f0ec7dd2c xen/arch/x86/boot/x86_32.S
--- a/xen/arch/x86/boot/x86_32.S        Wed Jun 20 16:58:21 2007 +0100
+++ b/xen/arch/x86/boot/x86_32.S        Wed Jun 20 17:05:48 2007 +0100
@@ -36,15 +36,29 @@ 1:      mov     %eax,(%edi)
 
 /* This is the default interrupt handler. */
 int_msg:
-        .asciz "Unknown interrupt\n"
+        .asciz "Unknown interrupt (cr2=%08x)\n"
+hex_msg:
+        .asciz "  %08x"
         ALIGN
 ignore_int:
+        pusha
         cld
         mov     $(__HYPERVISOR_DS),%eax
         mov     %eax,%ds
         mov     %eax,%es
+        mov     %cr2,%eax
+        push    %eax
         pushl   $int_msg
         call    printk
+        add     $8,%esp
+        mov     %esp,%ebp
+0:      pushl   (%ebp)
+        add     $4,%ebp
+        pushl   $hex_msg
+        call    printk
+        add     $8,%esp
+        test    $0xffc,%ebp
+        jnz     0b
 1:      jmp     1b
 
 ENTRY(stack_start)
diff -r 9c6076750685 -r f50f0ec7dd2c xen/arch/x86/boot/x86_64.S
--- a/xen/arch/x86/boot/x86_64.S        Wed Jun 20 16:58:21 2007 +0100
+++ b/xen/arch/x86/boot/x86_64.S        Wed Jun 20 17:05:48 2007 +0100
@@ -56,12 +56,23 @@ 1:      movq    %rax,(%rdi)
 
 /* This is the default interrupt handler. */
 int_msg:
-        .asciz "Unknown interrupt\n"
+        .asciz "Unknown interrupt (cr2=%016lx)\n"
+hex_msg:
+        .asciz "    %016lx"
 ignore_int:
-        cld
+        SAVE_ALL
+        movq    %cr2,%rsi
         leaq    int_msg(%rip),%rdi
         xorl    %eax,%eax
         call    printk
+        movq    %rsp,%rbp
+0:      movq    (%rbp),%rsi
+        addq    $8,%rbp
+        leaq    hex_msg(%rip),%rdi
+        xorl    %eax,%eax
+        call    printk
+        testq   $0xff8,%rbp
+        jnz     0b
 1:      jmp     1b
 
 

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