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_X86_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 = malloc(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