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authorAlexander Nyberg <alexn@telia.com>2005-06-26 01:58:27 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-26 03:24:55 +0400
commit4f339ecb30c759f94a29992d4635d9194132b6cf (patch)
tree9a1438b35d87a1d3a3359c273a39ac4895578e1c /arch/i386
parent6e274d144302068a00794ec22e73520c0615cb6f (diff)
downloadlinux-4f339ecb30c759f94a29992d4635d9194132b6cf.tar.xz
[PATCH] kdump: Save trap information for later analysis
If we are faulting in kernel it is quite possible this will lead to a panic. Save trap number, cr2 (in case of page fault) and error_code in the current thread (these fields already exist for signal delivery but are not used here). This helps later kdump crash analyzing from user-space (a script has been submitted to dig this info out in gdb). Signed-off-by: Alexander Nyberg <alexn@telia.com> Cc: <fastboot@lists.osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/traps.c12
-rw-r--r--arch/i386/mm/fault.c3
2 files changed, 11 insertions, 4 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index e458463ebc05..c6077a5ef7ce 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -369,6 +369,10 @@ static inline void die_if_kernel(const char * str, struct pt_regs * regs, long e
static void do_trap(int trapnr, int signr, char *str, int vm86,
struct pt_regs * regs, long error_code, siginfo_t *info)
{
+ struct task_struct *tsk = current;
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+
if (regs->eflags & VM_MASK) {
if (vm86)
goto vm86_trap;
@@ -379,9 +383,6 @@ static void do_trap(int trapnr, int signr, char *str, int vm86,
goto kernel_trap;
trap_signal: {
- struct task_struct *tsk = current;
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
if (info)
force_sig_info(signr, info, tsk);
else
@@ -494,6 +495,9 @@ fastcall void do_general_protection(struct pt_regs * regs, long error_code)
}
put_cpu();
+ current->thread.error_code = error_code;
+ current->thread.trap_no = 13;
+
if (regs->eflags & VM_MASK)
goto gp_in_vm86;
@@ -897,9 +901,9 @@ fastcall void do_simd_coprocessor_error(struct pt_regs * regs,
error_code);
return;
}
- die_if_kernel("cache flush denied", regs, error_code);
current->thread.trap_no = 19;
current->thread.error_code = error_code;
+ die_if_kernel("cache flush denied", regs, error_code);
force_sig(SIGSEGV, current);
}
}
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index a509237c4815..92ed6c0a55da 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -463,6 +463,9 @@ no_context:
printk(KERN_ALERT "*pte = %08lx\n", page);
}
#endif
+ tsk->thread.cr2 = address;
+ tsk->thread.trap_no = 14;
+ tsk->thread.error_code = error_code;
die("Oops", regs, error_code);
bust_spinlocks(0);
do_exit(SIGKILL);