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47 lines
987 B
C
47 lines
987 B
C
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/*
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* Stack trace utility
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*
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* Copyright 2008 Christoph Hellwig, IBM Corp.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <asm/ptrace.h>
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long sp;
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asm("mr %0,1" : "=r" (sp));
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for (;;) {
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unsigned long *stack = (unsigned long *) sp;
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unsigned long newsp, ip;
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if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
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return;
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newsp = stack[0];
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ip = stack[STACK_FRAME_LR_SAVE];
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if (!trace->skip)
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trace->entries[trace->nr_entries++] = ip;
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else
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trace->skip--;
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if (trace->nr_entries >= trace->max_entries)
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return;
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sp = newsp;
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}
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}
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