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 
11 #define STACK_SIZE 8192
12 
13 static int sample_ustack(struct perf_sample *sample,
14 			 struct thread *thread, u64 *regs)
15 {
16 	struct stack_dump *stack = &sample->user_stack;
17 	struct map *map;
18 	unsigned long sp;
19 	u64 stack_size, *buf;
20 
21 	buf = malloc(STACK_SIZE);
22 	if (!buf) {
23 		pr_debug("failed to allocate sample uregs data\n");
24 		return -1;
25 	}
26 
27 	sp = (unsigned long) regs[PERF_REG_ARM_SP];
28 
29 	map = maps__find(thread->maps, (u64)sp);
30 	if (!map) {
31 		pr_debug("failed to get stack map\n");
32 		free(buf);
33 		return -1;
34 	}
35 
36 	stack_size = map__end(map) - sp;
37 	stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
38 
39 	memcpy(buf, (void *) sp, stack_size);
40 	stack->data = (char *) buf;
41 	stack->size = stack_size;
42 	return 0;
43 }
44 
45 int test__arch_unwind_sample(struct perf_sample *sample,
46 			     struct thread *thread)
47 {
48 	struct regs_dump *regs = &sample->user_regs;
49 	u64 *buf;
50 
51 	buf = calloc(1, sizeof(u64) * PERF_REGS_MAX);
52 	if (!buf) {
53 		pr_debug("failed to allocate sample uregs data\n");
54 		return -1;
55 	}
56 
57 	perf_regs_load(buf);
58 	regs->abi  = PERF_SAMPLE_REGS_ABI;
59 	regs->regs = buf;
60 	regs->mask = PERF_REGS_MASK;
61 
62 	return sample_ustack(sample, thread, buf);
63 }
64