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 "event.h"
7 #include "debug.h"
8 #include "tests/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_ARM_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 = calloc(1, 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