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 }
  41
  42 unsigned long perf_instruction_pointer(struct pt_regs *regs)
  43 {
  44         if (perf_guest_state())
  45                 return perf_guest_get_ip();
  46
  47         return instruction_pointer(regs);
  48 }
  49
  50 unsigned long perf_misc_flags(struct pt_regs *regs)
  51 {
  52         unsigned int guest_state = perf_guest_state();
  53         int misc = 0;
  54
  55         if (guest_state) {
  56                 if (guest_state & PERF_GUEST_USER)
  57                         misc |= PERF_RECORD_MISC_GUEST_USER;
  58                 else
  59                         misc |= PERF_RECORD_MISC_GUEST_KERNEL;
  60         } else {
  61                 if (user_mode(regs))
  62                         misc |= PERF_RECORD_MISC_USER;
  63                 else
  64                         misc |= PERF_RECORD_MISC_KERNEL;
  65         }
  66
  67         return misc;
  68 }