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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>
36 lines
777 B
C
36 lines
777 B
C
#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <asm/ptrace.h>
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long ksp, fp, thread_base;
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struct thread_info *tp = task_thread_info(current);
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flushw_all();
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__asm__ __volatile__(
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"mov %%fp, %0"
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: "=r" (ksp)
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);
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fp = ksp + STACK_BIAS;
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thread_base = (unsigned long) tp;
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do {
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struct reg_window *rw;
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/* Bogus frame pointer? */
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if (fp < (thread_base + sizeof(struct thread_info)) ||
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fp >= (thread_base + THREAD_SIZE))
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break;
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rw = (struct reg_window *) fp;
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = rw->ins[7];
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fp = rw->ins[6] + STACK_BIAS;
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} while (trace->nr_entries < trace->max_entries);
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}
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