linux/arch/sh/kernel/perf_callchain.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Performance event callchain support - SuperH architecture code
   4 *
   5 * Copyright (C) 2009  Paul Mundt
   6 */
   7#include <linux/kernel.h>
   8#include <linux/sched.h>
   9#include <linux/perf_event.h>
  10#include <linux/percpu.h>
  11#include <asm/unwinder.h>
  12#include <asm/ptrace.h>
  13
  14static void callchain_address(void *data, unsigned long addr, int reliable)
  15{
  16        struct perf_callchain_entry_ctx *entry = data;
  17
  18        if (reliable)
  19                perf_callchain_store(entry, addr);
  20}
  21
  22static const struct stacktrace_ops callchain_ops = {
  23        .address        = callchain_address,
  24};
  25
  26void
  27perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
  28{
  29        perf_callchain_store(entry, regs->pc);
  30
  31        unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
  32}
  33