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[MIPS] Stacktrace build-fix and improvement

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Fix build error due to stacktrace API change.  Now save_stack_trace()
tries to save all kernel context, including interrupts and exception.
Also some asm code are changed a bit so that we can detect the end of
current context easily.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-09-28 19:15:33 +09:00 committed by Ralf Baechle
parent c8cc9618c5
commit 23126692e3
3 changed files with 29 additions and 35 deletions
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8
arch/mips/kernel/genex.S
View file

@ -220,8 +220,8 @@ NESTED(except_vec_vi_handler, 0, sp)
CLI
TRACE_IRQS_OFF
move a0, sp
jalr v0
j ret_from_irq
PTR_LA ra, ret_from_irq
jr v0
END(except_vec_vi_handler)
/*
@ -349,8 +349,8 @@ NESTED(nmi_handler, PT_SIZE, sp)
.set at
__BUILD_\verbose \exception
move a0, sp
jal do_\handler
j ret_from_exception
PTR_LA ra, ret_from_exception
j do_\handler
END(handle_\exception)
.endm

52
arch/mips/kernel/stacktrace.c
View file

@ -13,7 +13,7 @@
* Save stack-backtrace addresses into a stack_trace buffer:
*/
static void save_raw_context_stack(struct stack_trace *trace,
unsigned int skip, unsigned long reg29)
unsigned long reg29)
{
unsigned long *sp = (unsigned long *)reg29;
unsigned long addr;
@ -21,10 +21,10 @@ static void save_raw_context_stack(struct stack_trace *trace,
while (!kstack_end(sp)) {
addr = *sp++;
if (__kernel_text_address(addr)) {
if (!skip)
trace->entries[trace->nr_entries++] = addr;
if (trace->skip > 0)
trace->skip--;
else
skip--;
trace->entries[trace->nr_entries++] = addr;
if (trace->nr_entries >= trace->max_entries)
break;
}
@ -32,37 +32,40 @@ static void save_raw_context_stack(struct stack_trace *trace,
}
static struct pt_regs * save_context_stack(struct stack_trace *trace,
unsigned int skip, struct task_struct *task, struct pt_regs *regs)
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)) {
save_raw_context_stack(trace, skip, sp);
if (stack_page && sp >= stack_page &&
sp <= stack_page + THREAD_SIZE - 32)
save_raw_context_stack(trace, sp);
return NULL;
}
do {
if (!skip)
trace->entries[trace->nr_entries++] = pc;
if (trace->skip > 0)
trace->skip--;
else
skip--;
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) {
unsigned long stack_page =
(unsigned long)task_stack_page(task);
if (!stack_page ||
sp < stack_page ||
sp > stack_page + THREAD_SIZE - 32)
break;
return (struct pt_regs *)sp;
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;
@ -76,12 +79,8 @@ static struct pt_regs * save_context_stack(struct stack_trace *trace,
/*
* Save stack-backtrace addresses into a stack_trace buffer.
* If all_contexts is set, all contexts (hardirq, softirq and process)
* are saved. If not set then only the current context is saved.
*/
void save_stack_trace(struct stack_trace *trace,
struct task_struct *task, int all_contexts,
unsigned int skip)
void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
{
struct pt_regs dummyregs;
struct pt_regs *regs = &dummyregs;
@ -99,13 +98,8 @@ void save_stack_trace(struct stack_trace *trace,
}
while (1) {
regs = save_context_stack(trace, skip, task, regs);
if (!all_contexts || !regs ||
trace->nr_entries >= trace->max_entries)
regs = save_context_stack(trace, task, regs);
if (!regs || trace->nr_entries >= trace->max_entries)
break;
trace->entries[trace->nr_entries++] = ULONG_MAX;
if (trace->nr_entries >= trace->max_entries)
break;
skip = 0;
}
}

4
arch/mips/mm/tlbex-fault.S
View file

@ -19,8 +19,8 @@
move a0, sp
REG_S a2, PT_BVADDR(sp)
li a1, \write
jal do_page_fault
j ret_from_exception
PTR_LA ra, ret_from_exception
j do_page_fault
END(tlb_do_page_fault_\write)
.endm