80 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 819212 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(thread), (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 map__put(map);38 stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;39 40 memcpy(buf, (void *) sp, stack_size);41#ifdef MEMORY_SANITIZER42 /*43 * Copying the stack may copy msan poison, avoid false positives in the44 * unwinder by removing the poison here.45 */46 __msan_unpoison(buf, stack_size);47#endif48 stack->data = (char *) buf;49 stack->size = stack_size;50 return 0;51}52 53int test__arch_unwind_sample(struct perf_sample *sample,54 struct thread *thread)55{56 struct regs_dump *regs = &sample->user_regs;57 u64 *buf;58 59 buf = malloc(sizeof(u64) * PERF_REGS_MAX);60 if (!buf) {61 pr_debug("failed to allocate sample uregs data\n");62 return -1;63 }64 65#ifdef MEMORY_SANITIZER66 /*67 * Assignments to buf in the assembly function perf_regs_load aren't68 * seen by memory sanitizer. Zero the memory to convince memory69 * sanitizer the memory is initialized.70 */71 memset(buf, 0, sizeof(u64) * PERF_REGS_MAX);72#endif73 perf_regs_load(buf);74 regs->abi = PERF_SAMPLE_REGS_ABI;75 regs->regs = buf;76 regs->mask = PERF_REGS_MASK;77 78 return sample_ustack(sample, thread, buf);79}80