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
13static 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_X86_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 - sp;
37	stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
38
39	memcpy(buf, (void *) sp, stack_size);
40#ifdef MEMORY_SANITIZER
41	/*
42	 * Copying the stack may copy msan poison, avoid false positives in the
43	 * unwinder by removing the poison here.
44	 */
45	__msan_unpoison(buf, stack_size);
46#endif
47	stack->data = (char *) buf;
48	stack->size = stack_size;
49	return 0;
50}
51
52int test__arch_unwind_sample(struct perf_sample *sample,
53			     struct thread *thread)
54{
55	struct regs_dump *regs = &sample->user_regs;
56	u64 *buf;
57
58	buf = malloc(sizeof(u64) * PERF_REGS_MAX);
59	if (!buf) {
60		pr_debug("failed to allocate sample uregs data\n");
61		return -1;
62	}
63
64#ifdef MEMORY_SANITIZER
65	/*
66	 * Assignments to buf in the assembly function perf_regs_load aren't
67	 * seen by memory sanitizer. Zero the memory to convince memory
68	 * sanitizer the memory is initialized.
69	 */
70	memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);
71#endif
72	perf_regs_load(buf);
73	regs->abi  = PERF_SAMPLE_REGS_ABI;
74	regs->regs = buf;
75	regs->mask = PERF_REGS_MASK;
76
77	return sample_ustack(sample, thread, buf);
78}

 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#include "arch-tests.h"
11
12#define STACK_SIZE 8192
13
14static int sample_ustack(struct perf_sample *sample,
15			 struct thread *thread, u64 *regs)
16{
17	struct stack_dump *stack = &sample->user_stack;
18	struct map *map;
19	unsigned long sp;
20	u64 stack_size, *buf;
21
22	buf = malloc(STACK_SIZE);
23	if (!buf) {
24		pr_debug("failed to allocate sample uregs data\n");
25		return -1;
26	}
27
28	sp = (unsigned long) regs[PERF_REG_X86_SP];
29
30	map = maps__find(thread->maps, (u64)sp);
31	if (!map) {
32		pr_debug("failed to get stack map\n");
33		free(buf);
34		return -1;
35	}
36
37	stack_size = map->end - sp;
38	stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
39
40	memcpy(buf, (void *) sp, stack_size);
 
 
 
 
 
 
 
41	stack->data = (char *) buf;
42	stack->size = stack_size;
43	return 0;
44}
45
46int test__arch_unwind_sample(struct perf_sample *sample,
47			     struct thread *thread)
48{
49	struct regs_dump *regs = &sample->user_regs;
50	u64 *buf;
51
52	buf = malloc(sizeof(u64) * PERF_REGS_MAX);
53	if (!buf) {
54		pr_debug("failed to allocate sample uregs data\n");
55		return -1;
56	}
57
58#ifdef MEMORY_SANITIZER
59	/*
60	 * Assignments to buf in the assembly function perf_regs_load aren't
61	 * seen by memory sanitizer. Zero the memory to convince memory
62	 * sanitizer the memory is initialized.
63	 */
64	memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);
65#endif
66	perf_regs_load(buf);
67	regs->abi  = PERF_SAMPLE_REGS_ABI;
68	regs->regs = buf;
69	regs->mask = PERF_REGS_MASK;
70
71	return sample_ustack(sample, thread, buf);
72}