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

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  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 #include "arch-tests.h"
  9 
 10 #define STACK_SIZE 8192
 11 
 12 static int sample_ustack(struct perf_sample *sample,
 13                          struct thread *thread, u64 *regs)
 14 {
 15         struct stack_dump *stack = &sample->user_stack;
 16         struct map *map;
 17         unsigned long sp;
 18         u64 stack_size, *buf;
 19 
 20         buf = malloc(STACK_SIZE);
 21         if (!buf) {
 22                 pr_debug("failed to allocate sample uregs data\n");
 23                 return -1;
 24         }
 25 
 26         sp = (unsigned long) regs[PERF_REG_X86_SP];
 27 
 28         map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);
 29         if (!map) {
 30                 pr_debug("failed to get stack map\n");
 31                 free(buf);
 32                 return -1;
 33         }
 34 
 35         stack_size = map->end - sp;
 36         stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
 37 
 38         memcpy(buf, (void *) sp, stack_size);
 39         stack->data = (char *) buf;
 40         stack->size = stack_size;
 41         return 0;
 42 }
 43 
 44 int test__arch_unwind_sample(struct perf_sample *sample,
 45                              struct thread *thread)
 46 {
 47         struct regs_dump *regs = &sample->user_regs;
 48         u64 *buf;
 49 
 50         buf = malloc(sizeof(u64) * PERF_REGS_MAX);
 51         if (!buf) {
 52                 pr_debug("failed to allocate sample uregs data\n");
 53                 return -1;
 54         }
 55 
 56         perf_regs_load(buf);
 57         regs->abi  = PERF_SAMPLE_REGS_ABI;
 58         regs->regs = buf;
 59         regs->mask = PERF_REGS_MASK;
 60 
 61         return sample_ustack(sample, thread, buf);
 62 }
 63 

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