mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
ab1b6f03a1
Simplify the stacktrace code: - remove the unused task argument to save_stack_trace, it's always current - remove the all_contexts flag, it's alwasy 0 Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Andi Kleen <ak@suse.de> Cc: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* arch/mips/kernel/stacktrace.c
|
|
*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <asm/stacktrace.h>
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer:
|
|
*/
|
|
static void save_raw_context_stack(struct stack_trace *trace,
|
|
unsigned long reg29)
|
|
{
|
|
unsigned long *sp = (unsigned long *)reg29;
|
|
unsigned long addr;
|
|
|
|
while (!kstack_end(sp)) {
|
|
addr = *sp++;
|
|
if (__kernel_text_address(addr)) {
|
|
if (trace->skip > 0)
|
|
trace->skip--;
|
|
else
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void save_context_stack(struct stack_trace *trace, 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;
|
|
|
|
if (raw_show_trace || !__kernel_text_address(pc)) {
|
|
unsigned long stack_page =
|
|
(unsigned long)task_stack_page(current);
|
|
if (stack_page && sp >= stack_page &&
|
|
sp <= stack_page + THREAD_SIZE - 32)
|
|
save_raw_context_stack(trace, sp);
|
|
return;
|
|
}
|
|
do {
|
|
if (trace->skip > 0)
|
|
trace->skip--;
|
|
else
|
|
trace->entries[trace->nr_entries++] = pc;
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
break;
|
|
pc = unwind_stack(current, &sp, pc, &ra);
|
|
} while (pc);
|
|
#else
|
|
save_raw_context_stack(trace, sp);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
struct pt_regs dummyregs;
|
|
struct pt_regs *regs = &dummyregs;
|
|
|
|
WARN_ON(trace->nr_entries || !trace->max_entries);
|
|
|
|
prepare_frametrace(regs);
|
|
save_context_stack(trace, regs);
|
|
}
|