1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <string.h>
3*4882a593Smuzhiyun #include "perf_regs.h"
4*4882a593Smuzhiyun #include "thread.h"
5*4882a593Smuzhiyun #include "map.h"
6*4882a593Smuzhiyun #include "maps.h"
7*4882a593Smuzhiyun #include "event.h"
8*4882a593Smuzhiyun #include "debug.h"
9*4882a593Smuzhiyun #include "tests/tests.h"
10*4882a593Smuzhiyun #include "arch-tests.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define STACK_SIZE 8192
13*4882a593Smuzhiyun
sample_ustack(struct perf_sample * sample,struct thread * thread,u64 * regs)14*4882a593Smuzhiyun static int sample_ustack(struct perf_sample *sample,
15*4882a593Smuzhiyun struct thread *thread, u64 *regs)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun struct stack_dump *stack = &sample->user_stack;
18*4882a593Smuzhiyun struct map *map;
19*4882a593Smuzhiyun unsigned long sp;
20*4882a593Smuzhiyun u64 stack_size, *buf;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun buf = malloc(STACK_SIZE);
23*4882a593Smuzhiyun if (!buf) {
24*4882a593Smuzhiyun pr_debug("failed to allocate sample uregs data\n");
25*4882a593Smuzhiyun return -1;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun sp = (unsigned long) regs[PERF_REG_X86_SP];
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun map = maps__find(thread->maps, (u64)sp);
31*4882a593Smuzhiyun if (!map) {
32*4882a593Smuzhiyun pr_debug("failed to get stack map\n");
33*4882a593Smuzhiyun free(buf);
34*4882a593Smuzhiyun return -1;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun stack_size = map->end - sp;
38*4882a593Smuzhiyun stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun memcpy(buf, (void *) sp, stack_size);
41*4882a593Smuzhiyun #ifdef MEMORY_SANITIZER
42*4882a593Smuzhiyun /*
43*4882a593Smuzhiyun * Copying the stack may copy msan poison, avoid false positives in the
44*4882a593Smuzhiyun * unwinder by removing the poison here.
45*4882a593Smuzhiyun */
46*4882a593Smuzhiyun __msan_unpoison(buf, stack_size);
47*4882a593Smuzhiyun #endif
48*4882a593Smuzhiyun stack->data = (char *) buf;
49*4882a593Smuzhiyun stack->size = stack_size;
50*4882a593Smuzhiyun return 0;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
test__arch_unwind_sample(struct perf_sample * sample,struct thread * thread)53*4882a593Smuzhiyun int test__arch_unwind_sample(struct perf_sample *sample,
54*4882a593Smuzhiyun struct thread *thread)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun struct regs_dump *regs = &sample->user_regs;
57*4882a593Smuzhiyun u64 *buf;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun buf = malloc(sizeof(u64) * PERF_REGS_MAX);
60*4882a593Smuzhiyun if (!buf) {
61*4882a593Smuzhiyun pr_debug("failed to allocate sample uregs data\n");
62*4882a593Smuzhiyun return -1;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun #ifdef MEMORY_SANITIZER
66*4882a593Smuzhiyun /*
67*4882a593Smuzhiyun * Assignments to buf in the assembly function perf_regs_load aren't
68*4882a593Smuzhiyun * seen by memory sanitizer. Zero the memory to convince memory
69*4882a593Smuzhiyun * sanitizer the memory is initialized.
70*4882a593Smuzhiyun */
71*4882a593Smuzhiyun memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);
72*4882a593Smuzhiyun #endif
73*4882a593Smuzhiyun perf_regs_load(buf);
74*4882a593Smuzhiyun regs->abi = PERF_SAMPLE_REGS_ABI;
75*4882a593Smuzhiyun regs->regs = buf;
76*4882a593Smuzhiyun regs->mask = PERF_REGS_MASK;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return sample_ustack(sample, thread, buf);
79*4882a593Smuzhiyun }
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