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

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