tools/perf/arch/x86/tests/dwarf-unwind.c

   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 "maps.h"
   7 #include "event.h"
   8 #include "debug.h"
   9 #include "tests/tests.h"
  10 #include "arch-tests.h"
  11
  12 #define STACK_SIZE 8192
  13
  14 static int sample_ustack(struct perf_sample *sample,
  15                          struct thread *thread, u64 *regs)
  16 {
  17         struct stack_dump *stack = &sample->user_stack;
  18         struct map *map;
  19         unsigned long sp;
  20         u64 stack_size, *buf;
  21
  22         buf = malloc(STACK_SIZE);
  23         if (!buf) {
  24                 pr_debug("failed to allocate sample uregs data\n");
  25                 return -1;
  26         }
  27
  28         sp = (unsigned long) regs[PERF_REG_X86_SP];
  29
  30         map = maps__find(thread->maps, (u64)sp);
  31         if (!map) {
  32                 pr_debug("failed to get stack map\n");
  33                 free(buf);
  34                 return -1;
  35         }
  36
  37         stack_size = map->end - sp;
  38         stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
  39
  40         memcpy(buf, (void *) sp, stack_size);
  41         stack->data = (char *) buf;
  42         stack->size = stack_size;
  43         return 0;
  44 }
  45
  46 int test__arch_unwind_sample(struct perf_sample *sample,
  47                              struct thread *thread)
  48 {
  49         struct regs_dump *regs = &sample->user_regs;
  50         u64 *buf;
  51
  52         buf = malloc(sizeof(u64) * PERF_REGS_MAX);
  53         if (!buf) {
  54                 pr_debug("failed to allocate sample uregs data\n");
  55                 return -1;
  56         }
  57
  58 #ifdef MEMORY_SANITIZER
  59         /*
  60          * Assignments to buf in the assembly function perf_regs_load aren't
  61          * seen by memory sanitizer. Zero the memory to convince memory
  62          * sanitizer the memory is initialized.
  63          */
  64         memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);
  65 #endif
  66         perf_regs_load(buf);
  67         regs->abi  = PERF_SAMPLE_REGS_ABI;
  68         regs->regs = buf;
  69         regs->mask = PERF_REGS_MASK;
  70
  71         return sample_ustack(sample, thread, buf);
  72 }