tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12static 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
44int 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}