aboutsummaryrefslogtreecommitdiffstats
path: root/arch/i386/kernel/traps.c
diff options
context:
space:
mode:
authorAlexander Nyberg <alexn@telia.com>2005-06-25 17:58:27 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:55 -0400
commit4f339ecb30c759f94a29992d4635d9194132b6cf (patch)
tree9a1438b35d87a1d3a3359c273a39ac4895578e1c /arch/i386/kernel/traps.c
parent6e274d144302068a00794ec22e73520c0615cb6f (diff)
[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/kernel/traps.c')
-rw-r--r--arch/i386/kernel/traps.c12
1 files changed, 8 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
369static void do_trap(int trapnr, int signr, char *str, int vm86, 369static void do_trap(int trapnr, int signr, char *str, int vm86,
370 struct pt_regs * regs, long error_code, siginfo_t *info) 370 struct pt_regs * regs, long error_code, siginfo_t *info)
371{ 371{
372 struct task_struct *tsk = current;
373 tsk->thread.error_code = error_code;
374 tsk->thread.trap_no = trapnr;
375
372 if (regs->eflags & VM_MASK) { 376 if (regs->eflags & VM_MASK) {
373 if (vm86) 377 if (vm86)
374 goto vm86_trap; 378 goto vm86_trap;
@@ -379,9 +383,6 @@ static void do_trap(int trapnr, int signr, char *str, int vm86,
379 goto kernel_trap; 383 goto kernel_trap;
380 384
381 trap_signal: { 385 trap_signal: {
382 struct task_struct *tsk = current;
383 tsk->thread.error_code = error_code;
384 tsk->thread.trap_no = trapnr;
385 if (info) 386 if (info)
386 force_sig_info(signr, info, tsk); 387 force_sig_info(signr, info, tsk);
387 else 388 else
@@ -494,6 +495,9 @@ fastcall void do_general_protection(struct pt_regs * regs, long error_code)
494 } 495 }
495 put_cpu(); 496 put_cpu();
496 497
498 current->thread.error_code = error_code;
499 current->thread.trap_no = 13;
500
497 if (regs->eflags & VM_MASK) 501 if (regs->eflags & VM_MASK)
498 goto gp_in_vm86; 502 goto gp_in_vm86;
499 503
@@ -897,9 +901,9 @@ fastcall void do_simd_coprocessor_error(struct pt_regs * regs,
897 error_code); 901 error_code);
898 return; 902 return;
899 } 903 }
900 die_if_kernel("cache flush denied", regs, error_code);
901 current->thread.trap_no = 19; 904 current->thread.trap_no = 19;
902 current->thread.error_code = error_code; 905 current->thread.error_code = error_code;
906 die_if_kernel("cache flush denied", regs, error_code);
903 force_sig(SIGSEGV, current); 907 force_sig(SIGSEGV, current);
904 } 908 }
905} 909}