77c664fa58
Now that we have a magic cookie in the pt_regs, we can properly detect trap frames in stack bactraces. Signed-off-by: David S. Miller <davem@davemloft.net>
48 lines
1 KiB
C
48 lines
1 KiB
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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#include <asm/stacktrace.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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stack_trace_flush();
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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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struct pt_regs *regs;
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unsigned long pc;
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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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regs = (struct pt_regs *) (rw + 1);
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if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
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pc = regs->tpc;
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fp = regs->u_regs[UREG_I6] + STACK_BIAS;
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} else {
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pc = rw->ins[7];
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fp = rw->ins[6] + STACK_BIAS;
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}
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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++] = pc;
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} while (trace->nr_entries < trace->max_entries);
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}
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