summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--arch/mips/kernel/process.c36
-rw-r--r--arch/mips/kernel/stacktrace.c32
-rw-r--r--arch/mips/kernel/traps.c3
-rw-r--r--include/asm-mips/stacktrace.h2
4 files changed, 39 insertions, 34 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 695538031c69..045d987bc683 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -399,7 +399,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
#ifdef CONFIG_KALLSYMS
/* used by show_backtrace() */
unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
- unsigned long pc, unsigned long ra)
+ unsigned long pc, unsigned long *ra)
{
unsigned long stack_page;
struct mips_frame_info info;
@@ -407,18 +407,42 @@ unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
char namebuf[KSYM_NAME_LEN + 1];
unsigned long size, ofs;
int leaf;
+ extern void ret_from_irq(void);
+ extern void ret_from_exception(void);
stack_page = (unsigned long)task_stack_page(task);
if (!stack_page)
return 0;
+ /*
+ * If we reached the bottom of interrupt context,
+ * return saved pc in pt_regs.
+ */
+ if (pc == (unsigned long)ret_from_irq ||
+ pc == (unsigned long)ret_from_exception) {
+ struct pt_regs *regs;
+ if (*sp >= stack_page &&
+ *sp + sizeof(*regs) <= stack_page + THREAD_SIZE - 32) {
+ regs = (struct pt_regs *)*sp;
+ pc = regs->cp0_epc;
+ if (__kernel_text_address(pc)) {
+ *sp = regs->regs[29];
+ *ra = regs->regs[31];
+ return pc;
+ }
+ }
+ return 0;
+ }
if (!kallsyms_lookup(pc, &size, &ofs, &modname, namebuf))
return 0;
/*
* Return ra if an exception occured at the first instruction
*/
- if (unlikely(ofs == 0))
- return ra;
+ if (unlikely(ofs == 0)) {
+ pc = *ra;
+ *ra = 0;
+ return pc;
+ }
info.func = (void *)(pc - ofs);
info.func_size = ofs; /* analyze from start to ofs */
@@ -437,11 +461,12 @@ unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
* one. In that cases avoid to return always the
* same value.
*/
- pc = pc != ra ? ra : 0;
+ pc = pc != *ra ? *ra : 0;
else
pc = ((unsigned long *)(*sp))[info.pc_offset];
*sp += info.frame_size;
+ *ra = 0;
return __kernel_text_address(pc) ? pc : 0;
}
#endif
@@ -454,6 +479,7 @@ unsigned long get_wchan(struct task_struct *task)
unsigned long pc = 0;
#ifdef CONFIG_KALLSYMS
unsigned long sp;
+ unsigned long ra = 0;
#endif
if (!task || task == current || task->state == TASK_RUNNING)
@@ -467,7 +493,7 @@ unsigned long get_wchan(struct task_struct *task)
sp = task->thread.reg29 + schedule_mfi.frame_size;
while (in_sched_functions(pc))
- pc = unwind_stack(task, &sp, pc, 0);
+ pc = unwind_stack(task, &sp, pc, &ra);
#endif
out:
diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c
index 676e6f69d24b..4aabe526a68e 100644
--- a/arch/mips/kernel/stacktrace.c
+++ b/arch/mips/kernel/stacktrace.c
@@ -31,23 +31,21 @@ static void save_raw_context_stack(struct stack_trace *trace,
}
}
-static struct pt_regs * save_context_stack(struct stack_trace *trace,
+static void save_context_stack(struct stack_trace *trace,
struct task_struct *task, struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
unsigned long ra = regs->regs[31];
unsigned long pc = regs->cp0_epc;
- unsigned long stack_page =
- (unsigned long)task_stack_page(task);
- extern void ret_from_irq(void);
- extern void ret_from_exception(void);
if (raw_show_trace || !__kernel_text_address(pc)) {
+ unsigned long stack_page =
+ (unsigned long)task_stack_page(task);
if (stack_page && sp >= stack_page &&
sp <= stack_page + THREAD_SIZE - 32)
save_raw_context_stack(trace, sp);
- return NULL;
+ return;
}
do {
if (trace->skip > 0)
@@ -56,25 +54,11 @@ static struct pt_regs * save_context_stack(struct stack_trace *trace,
trace->entries[trace->nr_entries++] = pc;
if (trace->nr_entries >= trace->max_entries)
break;
- /*
- * If we reached the bottom of interrupt context,
- * return saved pt_regs.
- */
- if (pc == (unsigned long)ret_from_irq ||
- pc == (unsigned long)ret_from_exception) {
- if (stack_page && sp >= stack_page &&
- sp <= stack_page + THREAD_SIZE - 32)
- return (struct pt_regs *)sp;
- break;
- }
- pc = unwind_stack(task, &sp, pc, ra);
- ra = 0;
+ pc = unwind_stack(task, &sp, pc, &ra);
} while (pc);
#else
save_raw_context_stack(sp);
#endif
-
- return NULL;
}
/*
@@ -97,9 +81,5 @@ void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
prepare_frametrace(regs);
}
- while (1) {
- regs = save_context_stack(trace, task, regs);
- if (!regs || trace->nr_entries >= trace->max_entries)
- break;
- }
+ save_context_stack(trace, task, regs);
}
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 440b8651fd8b..b7292a56d4cd 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -115,8 +115,7 @@ static void show_backtrace(struct task_struct *task, struct pt_regs *regs)
printk("Call Trace:\n");
do {
print_ip_sym(pc);
- pc = unwind_stack(task, &sp, pc, ra);
- ra = 0;
+ pc = unwind_stack(task, &sp, pc, &ra);
} while (pc);
printk("\n");
}
diff --git a/include/asm-mips/stacktrace.h b/include/asm-mips/stacktrace.h
index 231f6f897a61..07f873351a86 100644
--- a/include/asm-mips/stacktrace.h
+++ b/include/asm-mips/stacktrace.h
@@ -6,7 +6,7 @@
#ifdef CONFIG_KALLSYMS
extern int raw_show_trace;
extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
- unsigned long pc, unsigned long ra);
+ unsigned long pc, unsigned long *ra);
#else
#define raw_show_trace 1
#define unwind_stack(task, sp, pc, ra) 0
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 10:47:23 +0000