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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-07-15 23:41:39 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:51 -0700
commit608e2619682e951f525b08e7a48669a3c0263b41 (patch)
tree034ec1a626c776da201c6664a0ac8b2ec0934167
parent94bed2a9c4ae980838003f5d32681eef794ecc28 (diff)
downloadlinux-2.6.34-ux500-608e2619682e951f525b08e7a48669a3c0263b41.tar.gz
generic bug: use show_regs() instead of dump_stack()
The current generic bug implementation has a call to dump_stack() in case a WARN_ON(whatever) gets hit. Since report_bug(), which calls dump_stack(), gets called from an exception handler we can do better: just pass the pt_regs structure to report_bug() and pass it to show_regs() in case of a warning. This will give more debug informations like register contents, etc... In addition this avoids some pointless lines that dump_stack() emits, since it includes a stack backtrace of the exception handler which is of no interest in case of a warning. E.g. on s390 the following lines are currently always present in a stack backtrace if dump_stack() gets called from report_bug(): [<000000000001517a>] show_trace+0x92/0xe8) [<0000000000015270>] show_stack+0xa0/0xd0 [<00000000000152ce>] dump_stack+0x2e/0x3c [<0000000000195450>] report_bug+0x98/0xf8 [<0000000000016cc8>] illegal_op+0x1fc/0x21c [<00000000000227d6>] sysc_return+0x0/0x10 Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Andi Kleen <ak@suse.de> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/avr32/kernel/traps.c2
-rw-r--r--arch/i386/kernel/traps.c2
-rw-r--r--arch/parisc/kernel/traps.c2
-rw-r--r--arch/powerpc/kernel/traps.c2
-rw-r--r--arch/ppc/kernel/traps.c2
-rw-r--r--arch/s390/kernel/traps.c2
-rw-r--r--arch/sh/kernel/traps.c2
-rw-r--r--arch/x86_64/kernel/traps.c2
-rw-r--r--include/linux/bug.h7
-rw-r--r--lib/bug.c5
10 files changed, 16 insertions, 12 deletions
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index 86d107511dd..aaa792815cd 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -184,7 +184,7 @@ asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
enum bug_trap_type type;
- type = report_bug(regs->pc);
+ type = report_bug(regs->pc, regs);
switch (type) {
case BUG_TRAP_TYPE_NONE:
break;
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 90da0575fcf..28bd1c5163e 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -390,7 +390,7 @@ void die(const char * str, struct pt_regs * regs, long err)
unsigned long esp;
unsigned short ss;
- report_bug(regs->eip);
+ report_bug(regs->eip, regs);
printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index c3ec9f1ec0f..f9bca2d74b3 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -302,7 +302,7 @@ static void handle_break(struct pt_regs *regs)
if (unlikely(iir == PARISC_BUG_BREAK_INSN && !user_mode(regs))) {
/* check if a BUG() or WARN() trapped here. */
enum bug_trap_type tt;
- tt = report_bug(regs->iaoq[0] & ~3);
+ tt = report_bug(regs->iaoq[0] & ~3, regs);
if (tt == BUG_TRAP_TYPE_WARN) {
regs->iaoq[0] += 4;
regs->iaoq[1] += 4;
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index bf6445ac9f1..3b8427e6283 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -777,7 +777,7 @@ void __kprobes program_check_exception(struct pt_regs *regs)
return;
if (!(regs->msr & MSR_PR) && /* not user-mode */
- report_bug(regs->nip) == BUG_TRAP_TYPE_WARN) {
+ report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
regs->nip += 4;
return;
}
diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
index aea100be52c..0eaef7c8378 100644
--- a/arch/ppc/kernel/traps.c
+++ b/arch/ppc/kernel/traps.c
@@ -619,7 +619,7 @@ void program_check_exception(struct pt_regs *regs)
return;
if (!(regs->msr & MSR_PR) && /* not user-mode */
- report_bug(regs->nip) == BUG_TRAP_TYPE_WARN) {
+ report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
regs->nip += 4;
return;
}
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index ee9186f8fb0..81e03b9c384 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -319,7 +319,7 @@ static void __kprobes inline do_trap(long interruption_code, int signr,
else {
enum bug_trap_type btt;
- btt = report_bug(regs->psw.addr & PSW_ADDR_INSN);
+ btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
if (btt == BUG_TRAP_TYPE_WARN)
return;
die(str, regs, interruption_code);
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index 8f18930d5bf..09480887076 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -874,7 +874,7 @@ void __init trap_init(void)
void handle_BUG(struct pt_regs *regs)
{
enum bug_trap_type tt;
- tt = report_bug(regs->pc);
+ tt = report_bug(regs->pc, regs);
if (tt == BUG_TRAP_TYPE_WARN) {
regs->pc += 2;
return;
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index aac1c0be54c..7fa155c394d 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -531,7 +531,7 @@ void die(const char * str, struct pt_regs * regs, long err)
unsigned long flags = oops_begin();
if (!user_mode(regs))
- report_bug(regs->rip);
+ report_bug(regs->rip, regs);
__die(str, regs, err);
oops_end(flags);
diff --git a/include/linux/bug.h b/include/linux/bug.h
index 42aa0a54b6f..54398d2c6d8 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -10,6 +10,8 @@ enum bug_trap_type {
BUG_TRAP_TYPE_BUG = 2,
};
+struct pt_regs;
+
#ifdef CONFIG_GENERIC_BUG
#include <asm-generic/bug.h>
@@ -20,7 +22,7 @@ static inline int is_warning_bug(const struct bug_entry *bug)
const struct bug_entry *find_bug(unsigned long bugaddr);
-enum bug_trap_type report_bug(unsigned long bug_addr);
+enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
int module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
struct module *);
@@ -31,7 +33,8 @@ int is_valid_bugaddr(unsigned long addr);
#else /* !CONFIG_GENERIC_BUG */
-static inline enum bug_trap_type report_bug(unsigned long bug_addr)
+static inline enum bug_trap_type report_bug(unsigned long bug_addr,
+ struct pt_regs *regs)
{
return BUG_TRAP_TYPE_BUG;
}
diff --git a/lib/bug.c b/lib/bug.c
index 014b582c5c4..530f38f5578 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -38,6 +38,7 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/bug.h>
+#include <linux/sched.h>
extern const struct bug_entry __start___bug_table[], __stop___bug_table[];
@@ -112,7 +113,7 @@ const struct bug_entry *find_bug(unsigned long bugaddr)
return module_find_bug(bugaddr);
}
-enum bug_trap_type report_bug(unsigned long bugaddr)
+enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
const struct bug_entry *bug;
const char *file;
@@ -147,7 +148,7 @@ enum bug_trap_type report_bug(unsigned long bugaddr)
"[verbose debug info unavailable]\n",
(void *)bugaddr);
- dump_stack();
+ show_regs(regs);
return BUG_TRAP_TYPE_WARN;
}