dwarf-unwind.c (1350B)
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_POWERPC_R1]; 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 stack->data = (char *) buf; 41 stack->size = stack_size; 42 return 0; 43} 44 45int test__arch_unwind_sample(struct perf_sample *sample, 46 struct thread *thread) 47{ 48 struct regs_dump *regs = &sample->user_regs; 49 u64 *buf; 50 51 buf = calloc(1, sizeof(u64) * PERF_REGS_MAX); 52 if (!buf) { 53 pr_debug("failed to allocate sample uregs data\n"); 54 return -1; 55 } 56 57 perf_regs_load(buf); 58 regs->abi = PERF_SAMPLE_REGS_ABI; 59 regs->regs = buf; 60 regs->mask = PERF_REGS_MASK; 61 62 return sample_ustack(sample, thread, buf); 63}