arch/arm64/kernel/perf_callchain.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arm64 callchain support
   4  *
   5  * Copyright (C) 2015 ARM Limited
   6  */
   7 #include <linux/perf_event.h>
   8 #include <linux/stacktrace.h>
   9 #include <linux/uaccess.h>
  10
  11 #include <asm/pointer_auth.h>
  12
  13 static bool callchain_trace(void *data, unsigned long pc)
  14 {
  15         struct perf_callchain_entry_ctx *entry = data;
  16
  17         return perf_callchain_store(entry, pc) == 0;
  18 }
  19
  20 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
  21                          struct pt_regs *regs)
  22 {
  23         if (perf_guest_state()) {
  24                 /* We don't support guest os callchain now */
  25                 return;
  26         }
  27
  28         arch_stack_walk_user(callchain_trace, entry, regs);
  29 }
  30
  31 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
  32                            struct pt_regs *regs)
  33 {
  34         if (perf_guest_state()) {
  35                 /* We don't support guest os callchain now */
  36                 return;
  37         }
  38
  39         arch_stack_walk(callchain_trace, entry, current, regs);
  40 }