microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

[PATCH] i386/x86-64: fall back to old-style call trace if no unwinding 

If no unwinding is possible at all for a certain exception instance,
fall back to the old style call trace instead of not showing any trace
at all.

Also, allow setting the stack trace mode at the command line.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-06-26 13:57:47 +02:00 коммит произвёл Linus Torvalds
Родитель fe7cacc1c2
Коммит c33bd9aac0
6 изменённых файлов: 83 добавлений и 45 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

42
arch/i386/kernel/traps.c
Просмотреть файл

@ -93,6 +93,7 @@ asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
static int kstack_depth_to_print = 24;
static int call_trace = 1;
ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb)
@ -171,40 +172,47 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
return ebp;
}
static asmlinkage void show_trace_unwind(struct unwind_frame_info *info, void *log_lvl)
static asmlinkage int show_trace_unwind(struct unwind_frame_info *info, void *log_lvl)
{
int n = 0;
int printed = 0; /* nr of entries already printed on current line */
while (unwind(info) == 0 && UNW_PC(info)) {
++n;
printed = print_addr_and_symbol(UNW_PC(info), log_lvl, printed);
if (arch_unw_user_mode(info))
break;
}
if (printed)
printk("\n");
return n;
}
static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl)
{
unsigned long ebp;
struct unwind_frame_info info;
if (!task)
task = current;
if (call_trace >= 0) {
int unw_ret = 0;
struct unwind_frame_info info;
if (regs) {
if (unwind_init_frame_info(&info, task, regs) == 0) {
show_trace_unwind(&info, log_lvl);
return;
if (unwind_init_frame_info(&info, task, regs) == 0)
unw_ret = show_trace_unwind(&info, log_lvl);
} else if (task == current)
unw_ret = unwind_init_running(&info, show_trace_unwind, log_lvl);
else {
if (unwind_init_blocked(&info, task) == 0)
unw_ret = show_trace_unwind(&info, log_lvl);
}
} else if (task == current) {
if (unwind_init_running(&info, show_trace_unwind, log_lvl) == 0)
return;
} else {
if (unwind_init_blocked(&info, task) == 0) {
show_trace_unwind(&info, log_lvl);
if (unw_ret > 0) {
if (call_trace > 0)
return;
printk("%sLegacy call trace:\n", log_lvl);
}
}
@ -1245,3 +1253,15 @@ static int __init kstack_setup(char *s)
return 1;
}
__setup("kstack=", kstack_setup);
static int __init call_trace_setup(char *s)
{
if (strcmp(s, "old") == 0)
call_trace = -1;
else if (strcmp(s, "both") == 0)
call_trace = 0;
else if (strcmp(s, "new") == 0)
call_trace = 1;
return 1;
}
__setup("call_trace=", call_trace_setup);

47
arch/x86_64/kernel/traps.c
Просмотреть файл

@ -107,6 +107,7 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
}
static int kstack_depth_to_print = 10;
static int call_trace = 1;
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
@ -190,11 +191,12 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
return NULL;
}
static void show_trace_unwind(struct unwind_frame_info *info, void *context)
static int show_trace_unwind(struct unwind_frame_info *info, void *context)
{
int i = 11;
int i = 11, n = 0;
while (unwind(info) == 0 && UNW_PC(info)) {
++n;
if (i > 50) {
printk("\n ");
i = 7;
@ -205,6 +207,7 @@ static void show_trace_unwind(struct unwind_frame_info *info, void *context)
break;
}
printk("\n");
return n;
}
/*
@ -218,27 +221,32 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
{
const unsigned cpu = safe_smp_processor_id();
unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
int i;
int i = 11;
unsigned used = 0;
struct unwind_frame_info info;
printk("\nCall Trace:");
if (!tsk)
tsk = current;
if (call_trace >= 0) {
int unw_ret = 0;
struct unwind_frame_info info;
if (regs) {
if (unwind_init_frame_info(&info, tsk, regs) == 0) {
show_trace_unwind(&info, NULL);
return;
if (unwind_init_frame_info(&info, tsk, regs) == 0)
unw_ret = show_trace_unwind(&info, NULL);
} else if (tsk == current)
unw_ret = unwind_init_running(&info, show_trace_unwind, NULL);
else {
if (unwind_init_blocked(&info, tsk) == 0)
unw_ret = show_trace_unwind(&info, NULL);
}
} else if (tsk == current) {
if (unwind_init_running(&info, show_trace_unwind, NULL) == 0)
return;
} else {
if (unwind_init_blocked(&info, tsk) == 0) {
show_trace_unwind(&info, NULL);
if (unw_ret > 0) {
if (call_trace > 0)
return;
printk("Legacy call trace:");
i = 18;
}
}
@ -264,7 +272,7 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
} \
} while (0)
for(i = 11; ; ) {
for(; ; ) {
const char *id;
unsigned long *estack_end;
estack_end = in_exception_stack(cpu, (unsigned long)stack,
@ -1052,3 +1060,14 @@ static int __init kstack_setup(char *s)
}
__setup("kstack=", kstack_setup);
static int __init call_trace_setup(char *s)
{
if (strcmp(s, "old") == 0)
call_trace = -1;
else if (strcmp(s, "both") == 0)
call_trace = 0;
else if (strcmp(s, "new") == 0)
call_trace = 1;
return 1;
}
__setup("call_trace=", call_trace_setup);

4
include/asm-i386/unwind.h
Просмотреть файл

@ -66,8 +66,8 @@ static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
info->regs.xes = __USER_DS;
}
extern asmlinkage void arch_unwind_init_running(struct unwind_frame_info *,
asmlinkage void (*callback)(struct unwind_frame_info *,
extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *,
asmlinkage int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg);

4
include/asm-x86_64/unwind.h
Просмотреть файл

@ -75,8 +75,8 @@ static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
info->regs.ss = __KERNEL_DS;
}
extern void arch_unwind_init_running(struct unwind_frame_info *,
void (*callback)(struct unwind_frame_info *,
extern int arch_unwind_init_running(struct unwind_frame_info *,
int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg);

4
include/linux/unwind.h
Просмотреть файл

@ -49,7 +49,7 @@ extern int unwind_init_blocked(struct unwind_frame_info *,
* Prepare to unwind the currently running thread.
*/
extern int unwind_init_running(struct unwind_frame_info *,
asmlinkage void (*callback)(struct unwind_frame_info *,
asmlinkage int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg);
@ -97,7 +97,7 @@ static inline int unwind_init_blocked(struct unwind_frame_info *info,
}
static inline int unwind_init_running(struct unwind_frame_info *info,
asmlinkage void (*cb)(struct unwind_frame_info *,
asmlinkage int (*cb)(struct unwind_frame_info *,
void *arg),
void *arg)
{

5
kernel/unwind.c
Просмотреть файл

@ -885,14 +885,13 @@ EXPORT_SYMBOL(unwind_init_blocked);
* Prepare to unwind the currently running thread.
*/
int unwind_init_running(struct unwind_frame_info *info,
asmlinkage void (*callback)(struct unwind_frame_info *,
asmlinkage int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg)
{
info->task = current;
arch_unwind_init_running(info, callback, arg);
return 0;
return arch_unwind_init_running(info, callback, arg);
}
EXPORT_SYMBOL(unwind_init_running);