forked from luck/tmp_suning_uos_patched
6f63e781ea
Things like lockdep can try to do stack backtraces before the irqstack blocks have been setup. So don't try to match their ranges so early on. Also, remove unused variable in save_stack_trace(). Signed-off-by: David S. Miller <davem@davemloft.net>
51 lines
1.0 KiB
C
51 lines
1.0 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 <linux/module.h>
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#include <asm/ptrace.h>
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#include <asm/stacktrace.h>
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#include "kstack.h"
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void save_stack_trace(struct stack_trace *trace)
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{
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struct thread_info *tp = task_thread_info(current);
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unsigned long ksp, fp;
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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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do {
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struct sparc_stackf *sf;
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struct pt_regs *regs;
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unsigned long pc;
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if (!kstack_valid(tp, fp))
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break;
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sf = (struct sparc_stackf *) fp;
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regs = (struct pt_regs *) (sf + 1);
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if (kstack_is_trap_frame(tp, regs)) {
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if (!(regs->tstate & TSTATE_PRIV))
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break;
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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 = sf->callers_pc;
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fp = (unsigned long)sf->fp + 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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EXPORT_SYMBOL_GPL(save_stack_trace);
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