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 14 static 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 46 int 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 } 73