root/tools/perf/arch/arm/tests/dwarf-unwind.c

DEFINITIONS

1. sample_ustack
2. test__arch_unwind_sample

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <string.h>
   3 #include "perf_regs.h"
   4 #include "thread.h"
   5 #include "map.h"
   6 #include "map_groups.h"
   7 #include "event.h"
   8 #include "debug.h"
   9 #include "tests/tests.h"
  10 
  11 #define STACK_SIZE 8192
  12 
  13 static int sample_ustack(struct perf_sample *sample,
  14                          struct thread *thread, u64 *regs)
  15 {
  16         struct stack_dump *stack = &sample->user_stack;
  17         struct map *map;
  18         unsigned long sp;
  19         u64 stack_size, *buf;
  20 
  21         buf = malloc(STACK_SIZE);
  22         if (!buf) {
  23                 pr_debug("failed to allocate sample uregs data\n");
  24                 return -1;
  25         }
  26 
  27         sp = (unsigned long) regs[PERF_REG_ARM_SP];
  28 
  29         map = map_groups__find(thread->mg, (u64)sp);
  30         if (!map) {
  31                 pr_debug("failed to get stack map\n");
  32                 free(buf);
  33                 return -1;
  34         }
  35 
  36         stack_size = map->end - sp;
  37         stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
  38 
  39         memcpy(buf, (void *) sp, stack_size);
  40         stack->data = (char *) buf;
  41         stack->size = stack_size;
  42         return 0;
  43 }
  44 
  45 int test__arch_unwind_sample(struct perf_sample *sample,
  46                              struct thread *thread)
  47 {
  48         struct regs_dump *regs = &sample->user_regs;
  49         u64 *buf;
  50 
  51         buf = calloc(1, sizeof(u64) * PERF_REGS_MAX);
  52         if (!buf) {
  53                 pr_debug("failed to allocate sample uregs data\n");
  54                 return -1;
  55         }
  56 
  57         perf_regs_load(buf);
  58         regs->abi  = PERF_SAMPLE_REGS_ABI;
  59         regs->regs = buf;
  60         regs->mask = PERF_REGS_MASK;
  61 
  62         return sample_ustack(sample, thread, buf);
  63 }