stacktrace.c (7a9787e1eba95a166265e6a260cf30af04ef0a99) stacktrace.c (2ec220e27f5040aec1e88901c1b6ea3d135787ad)
1/*
2 * arch/mips/kernel/stacktrace.c
3 *
4 * Stack trace management functions
5 *
6 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
7 */
8#include <linux/sched.h>

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27 else
28 trace->entries[trace->nr_entries++] = addr;
29 if (trace->nr_entries >= trace->max_entries)
30 break;
31 }
32 }
33}
34
1/*
2 * arch/mips/kernel/stacktrace.c
3 *
4 * Stack trace management functions
5 *
6 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
7 */
8#include <linux/sched.h>

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27 else
28 trace->entries[trace->nr_entries++] = addr;
29 if (trace->nr_entries >= trace->max_entries)
30 break;
31 }
32 }
33}
34
35static void save_context_stack(struct stack_trace *trace, struct pt_regs *regs)
35static void save_context_stack(struct stack_trace *trace,
36 struct task_struct *tsk, struct pt_regs *regs)
36{
37 unsigned long sp = regs->regs[29];
38#ifdef CONFIG_KALLSYMS
39 unsigned long ra = regs->regs[31];
40 unsigned long pc = regs->cp0_epc;
41
42 if (raw_show_trace || !__kernel_text_address(pc)) {
43 unsigned long stack_page =
37{
38 unsigned long sp = regs->regs[29];
39#ifdef CONFIG_KALLSYMS
40 unsigned long ra = regs->regs[31];
41 unsigned long pc = regs->cp0_epc;
42
43 if (raw_show_trace || !__kernel_text_address(pc)) {
44 unsigned long stack_page =
44 (unsigned long)task_stack_page(current);
45 (unsigned long)task_stack_page(tsk);
45 if (stack_page && sp >= stack_page &&
46 sp <= stack_page + THREAD_SIZE - 32)
47 save_raw_context_stack(trace, sp);
48 return;
49 }
50 do {
51 if (trace->skip > 0)
52 trace->skip--;
53 else
54 trace->entries[trace->nr_entries++] = pc;
55 if (trace->nr_entries >= trace->max_entries)
56 break;
46 if (stack_page && sp >= stack_page &&
47 sp <= stack_page + THREAD_SIZE - 32)
48 save_raw_context_stack(trace, sp);
49 return;
50 }
51 do {
52 if (trace->skip > 0)
53 trace->skip--;
54 else
55 trace->entries[trace->nr_entries++] = pc;
56 if (trace->nr_entries >= trace->max_entries)
57 break;
57 pc = unwind_stack(current, &sp, pc, &ra);
58 pc = unwind_stack(tsk, &sp, pc, &ra);
58 } while (pc);
59#else
60 save_raw_context_stack(trace, sp);
61#endif
62}
63
64/*
65 * Save stack-backtrace addresses into a stack_trace buffer.
66 */
67void save_stack_trace(struct stack_trace *trace)
68{
59 } while (pc);
60#else
61 save_raw_context_stack(trace, sp);
62#endif
63}
64
65/*
66 * Save stack-backtrace addresses into a stack_trace buffer.
67 */
68void save_stack_trace(struct stack_trace *trace)
69{
70 save_stack_trace_tsk(current, trace);
71}
72EXPORT_SYMBOL_GPL(save_stack_trace);
73
74void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
75{
69 struct pt_regs dummyregs;
70 struct pt_regs *regs = &dummyregs;
71
72 WARN_ON(trace->nr_entries || !trace->max_entries);
73
76 struct pt_regs dummyregs;
77 struct pt_regs *regs = &dummyregs;
78
79 WARN_ON(trace->nr_entries || !trace->max_entries);
80
74 prepare_frametrace(regs);
75 save_context_stack(trace, regs);
81 if (tsk != current) {
82 regs->regs[29] = tsk->thread.reg29;
83 regs->regs[31] = 0;
84 regs->cp0_epc = tsk->thread.reg31;
85 } else
86 prepare_frametrace(regs);
87 save_context_stack(trace, tsk, regs);
76}
88}
77EXPORT_SYMBOL_GPL(save_stack_trace);
89EXPORT_SYMBOL_GPL(save_stack_trace_tsk);