linux/include/asm-um/common.lds.S
Nick Piggin 08932a1983 uml: use generic BUG
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 <npiggin@suse.de>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-06-24 08:59:11 -07:00

100 lines
2.1 KiB
ArmAsm

#include <asm-generic/vmlinux.lds.h>
.fini : { *(.fini) } =0x9090
_etext = .;
PROVIDE (etext = .);
. = ALIGN(4096);
_sdata = .;
PROVIDE (sdata = .);
RODATA
.unprotected : { *(.unprotected) }
. = ALIGN(4096);
PROVIDE (_unprotected_end = .);
. = ALIGN(4096);
.note : { *(.note.*) }
__start___ex_table = .;
__ex_table : { *(__ex_table) }
__stop___ex_table = .;
BUG_TABLE
__uml_setup_start = .;
.uml.setup.init : { *(.uml.setup.init) }
__uml_setup_end = .;
__uml_help_start = .;
.uml.help.init : { *(.uml.help.init) }
__uml_help_end = .;
__uml_postsetup_start = .;
.uml.postsetup.init : { *(.uml.postsetup.init) }
__uml_postsetup_end = .;
__setup_start = .;
.init.setup : { *(.init.setup) }
__setup_end = .;
. = ALIGN(32);
__per_cpu_start = . ;
.data.percpu : { *(.data.percpu) }
__per_cpu_end = . ;
__initcall_start = .;
.initcall.init : {
INITCALLS
}
__initcall_end = .;
__con_initcall_start = .;
.con_initcall.init : { *(.con_initcall.init) }
__con_initcall_end = .;
__uml_initcall_start = .;
.uml.initcall.init : { *(.uml.initcall.init) }
__uml_initcall_end = .;
__init_end = .;
SECURITY_INIT
__exitcall_begin = .;
.exitcall : { *(.exitcall.exit) }
__exitcall_end = .;
__uml_exitcall_begin = .;
.uml.exitcall : { *(.uml.exitcall.exit) }
__uml_exitcall_end = .;
. = ALIGN(4);
__alt_instructions = .;
.altinstructions : { *(.altinstructions) }
__alt_instructions_end = .;
.altinstr_replacement : { *(.altinstr_replacement) }
/* .exit.text is discard at runtime, not link time, to deal with references
from .altinstructions and .eh_frame */
.exit.text : { *(.exit.text) }
.exit.data : { *(.exit.data) }
__preinit_array_start = .;
.preinit_array : { *(.preinit_array) }
__preinit_array_end = .;
__init_array_start = .;
.init_array : { *(.init_array) }
__init_array_end = .;
__fini_array_start = .;
.fini_array : { *(.fini_array) }
__fini_array_end = .;
. = ALIGN(4096);
__initramfs_start = .;
.init.ramfs : { *(.init.ramfs) }
__initramfs_end = .;
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
}