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Linux/tools/perf/arch/arm64/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 
  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_ARM64_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 }
 62 

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