From: Nick Piggin <[email protected]>
Get UML to use the generic bug support rather than arch specific one.
If I insert an artificial bug right before loading init, I get this:
Kernel panic - not syncing: Kernel mode signal 4
EIP: 0023:[<0819d501>] CPU: 0 Not tainted ESP: 002b:f7fd4fbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 00007870 ECX: 00000013 EDX: 00007870
ESI: 0000786d EDI: 00000011 EBP: f7fd4fd8 DS: 002b ES: 002b
08273bec: [<0806e814>] show_regs+0x104/0x106
08273c08: [<08058927>] panic_exit+0x2c/0x4b
08273c18: [<08080ee7>] notifier_call_chain+0x32/0x5b
08273c38: [<08080fbd>] __atomic_notifier_call_chain+0x30/0x32
08273c54: [<08080fee>] atomic_notifier_call_chain+0x2f/0x31
08273c70: [<08073b88>] panic+0x75/0x131
08273c94: [<080586c7>] relay_signal+0x87/0x95
08273cb0: [<0806b9ee>] sig_handler_common_skas+0x9e/0x120
08273cd8: [<08067738>] sig_handler+0x28/0x4f
08273cec: [<0806792e>] handle_signal+0x53/0x89
08273d0c: [<08069f60>] hard_handler+0x18/0x28
08273d1c: [<ffffe500>] transitions+0xf7d598b8/0xfffffff0
With this patch in place, this is how it looks:
BUG: failure at init/main.c:779/init_post()!
Kernel panic - not syncing: BUG!
EIP: 0023:[<081a65d1>] CPU: 0 Not tainted ESP: 002b:f7f0dfbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 000069db ECX: 00000013 EDX: 000069db
ESI: 000069d8 EDI: 00000011 EBP: f7f0dfd8 DS: 002b ES: 002b
098efedc: [<0806e9a4>] show_regs+0x104/0x106
098efef8: [<080589c7>] panic_exit+0x2c/0x4b
098eff08: [<080818d7>] notifier_call_chain+0x32/0x5b
098eff28: [<080819ad>] __atomic_notifier_call_chain+0x30/0x32
098eff44: [<080819de>] atomic_notifier_call_chain+0x2f/0x31
098eff60: [<08073f28>] panic+0x75/0x131
098eff84: [<080541d5>] init_post+0xcd/0xe8
098eff9c: [<08048ad4>] kernel_init+0x8e/0x9a
098effb4: [<08066dee>] run_kernel_thread+0x41/0x53
098effe0: [<08058e75>] new_thread_handler+0x62/0x8b
098efffc: [<a55a5a5a>] 0xa55a5a5a
[ jdike - added BUG_TABLE to linker script ]
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Jeff Dike <[email protected]>
--
include/asm-um/bug.h | 2 +-
include/asm-um/common.lds.S | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6.21-mm/include/asm-um/bug.h
===================================================================
--- linux-2.6.21-mm.orig/include/asm-um/bug.h 2007-06-14 15:28:21.000000000 -0400
+++ linux-2.6.21-mm/include/asm-um/bug.h 2007-06-14 16:10:07.000000000 -0400
@@ -1,6 +1,6 @@
#ifndef __UM_BUG_H
#define __UM_BUG_H
-#include <asm/arch/bug.h>
+#include <asm-generic/bug.h>
#endif
Index: linux-2.6.21-mm/include/asm-um/common.lds.S
===================================================================
--- linux-2.6.21-mm.orig/include/asm-um/common.lds.S 2007-05-07 10:24:48.000000000 -0400
+++ linux-2.6.21-mm/include/asm-um/common.lds.S 2007-06-15 11:00:48.000000000 -0400
@@ -20,6 +20,8 @@
__ex_table : { *(__ex_table) }
__stop___ex_table = .;
+ BUG_TABLE
+
__uml_setup_start = .;
.uml.setup.init : { *(.uml.setup.init) }
__uml_setup_end = .;