tools/perf/arch/x86/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 "tests/tests.h"
   7
   8 #define STACK_SIZE 8192
   9
  10 static int sample_ustack(struct perf_sample *sample,
  11                          struct thread *thread, u64 *regs)
  12 {
  13         struct stack_dump *stack = &sample->user_stack;
  14         struct map *map;
  15         unsigned long sp;
  16         u64 stack_size, *buf;
  17
  18         buf = malloc(STACK_SIZE);
  19         if (!buf) {
  20                 pr_debug("failed to allocate sample uregs data\n");
  21                 return -1;
  22         }
  23
  24         sp = (unsigned long) regs[PERF_REG_X86_SP];
  25
  26         map = map_groups__find(&thread->mg, MAP__FUNCTION, (u64) sp);
  27         if (!map) {
  28                 pr_debug("failed to get stack map\n");
  29                 return -1;
  30         }
  31
  32         stack_size = map->end - sp;
  33         stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
  34
  35         memcpy(buf, (void *) sp, stack_size);
  36         stack->data = (char *) buf;
  37         stack->size = stack_size;
  38         return 0;
  39 }
  40
  41 int test__arch_unwind_sample(struct perf_sample *sample,
  42                              struct thread *thread)
  43 {
  44         struct regs_dump *regs = &sample->user_regs;
  45         u64 *buf;
  46
  47         buf = malloc(sizeof(u64) * PERF_REGS_MAX);
  48         if (!buf) {
  49                 pr_debug("failed to allocate sample uregs data\n");
  50                 return -1;
  51         }
  52
  53         perf_regs_load(buf);
  54         regs->abi  = PERF_SAMPLE_REGS_ABI;
  55         regs->regs = buf;
  56         regs->mask = PERF_REGS_MASK;
  57
  58         return sample_ustack(sample, thread, buf);
  59 }