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[POWERPC] print backtrace when entering xmon

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xmon does not print a backtrace per default. This is bad on systems with
USB keyboard, the most needed info about the crash is lost.
print a backtrace during the very first xmon entry.

Booting with xmon=nobt disables the autobacktrace functionality.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olaf Hering 2006-09-08 16:29:21 +02:00 committed by Paul Mackerras
parent 87fd7724d4
commit 26c8af5f01
3 changed files with 16 additions and 0 deletions
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2
arch/powerpc/Kconfig.debug
View File

@ -88,6 +88,8 @@ config XMON
very early during boot. 'xmon=on' will just enable the xmon
debugger hooks. 'xmon=off' will disable the debugger hooks
if CONFIG_XMON_DEFAULT is set.
xmon will print a backtrace on the very first invocation.
'xmon=nobt' will disable this autobacktrace.
config XMON_DEFAULT
bool "Enable xmon by default"

4
arch/powerpc/kernel/setup-common.c
View File

@ -441,6 +441,8 @@ void __init smp_setup_cpu_maps(void)
int __initdata do_early_xmon;
#ifdef CONFIG_XMON
extern int xmon_no_auto_backtrace;
static int __init early_xmon(char *p)
{
/* ensure xmon is enabled */
@ -449,6 +451,8 @@ static int __init early_xmon(char *p)
xmon_init(1);
if (strncmp(p, "off", 3) == 0)
xmon_init(0);
if (strncmp(p, "nobt", 4) == 0)
xmon_no_auto_backtrace = 1;
if (strncmp(p, "early", 5) != 0)
return 0;
}

10
arch/powerpc/xmon/xmon.c
View File

@ -137,10 +137,14 @@ static void bootcmds(void);
static void proccall(void);
void dump_segments(void);
static void symbol_lookup(void);
static void xmon_show_stack(unsigned long sp, unsigned long lr,
unsigned long pc);
static void xmon_print_symbol(unsigned long address, const char *mid,
const char *after);
static const char *getvecname(unsigned long vec);
int xmon_no_auto_backtrace;
extern int print_insn_powerpc(unsigned long, unsigned long, int);
extern void xmon_enter(void);
@ -736,6 +740,12 @@ cmds(struct pt_regs *excp)
last_cmd = NULL;
xmon_regs = excp;
if (!xmon_no_auto_backtrace) {
xmon_no_auto_backtrace = 1;
xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
}
for(;;) {
#ifdef CONFIG_SMP
printf("%x:", smp_processor_id());