1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2019, Linaro Limited 4 */ 5 6 #include <assert.h> 7 #include <printk.h> 8 #include <sys/queue.h> 9 #include <types_ext.h> 10 #include <util.h> 11 #include <user_ta_header.h> 12 13 #include "ftrace.h" 14 #include "ta_elf.h" 15 16 #define MIN_FTRACE_BUF_SIZE 1024 17 #define MAX_HEADER_STRLEN 128 18 19 static struct __ftrace_info *finfo; 20 static struct ftrace_buf *fbuf; 21 22 bool ftrace_init(void) 23 { 24 struct ta_elf *elf = TAILQ_FIRST(&main_elf_queue); 25 TEE_Result res = TEE_SUCCESS; 26 vaddr_t val = 0; 27 int count = 0; 28 size_t fbuf_size = 0; 29 30 res = ta_elf_resolve_sym("__ftrace_info", &val); 31 if (res) 32 return false; 33 34 finfo = (struct __ftrace_info *)val; 35 36 assert(elf && elf->is_main); 37 38 if (SUB_OVERFLOW(finfo->buf_end, finfo->buf_start, &fbuf_size)) 39 return false; 40 41 if (fbuf_size < MIN_FTRACE_BUF_SIZE) { 42 DMSG("ftrace buffer too small"); 43 return false; 44 } 45 46 fbuf = (struct ftrace_buf *)finfo->buf_start; 47 fbuf->head_off = sizeof(struct ftrace_buf); 48 count = snprintk((char *)fbuf + fbuf->head_off, MAX_HEADER_STRLEN, 49 "Function graph for TA: %pUl @ %lx\n", 50 (void *)&elf->uuid, elf->load_addr); 51 assert(count < MAX_HEADER_STRLEN); 52 53 fbuf->ret_func_ptr = finfo->ret_ptr; 54 fbuf->ret_idx = 0; 55 fbuf->lr_idx = 0; 56 fbuf->buf_off = fbuf->head_off + count; 57 fbuf->curr_size = 0; 58 fbuf->max_size = fbuf_size - sizeof(struct ftrace_buf) - count; 59 60 return true; 61 } 62 63 void ftrace_copy_buf(void *pctx, void (*copy_func)(void *pctx, void *b, 64 size_t bl)) 65 { 66 if (fbuf) { 67 struct ta_elf *elf = TAILQ_FIRST(&main_elf_queue); 68 size_t dump_size = fbuf->buf_off - fbuf->head_off + 69 fbuf->curr_size; 70 71 assert(elf && elf->is_main); 72 copy_func(pctx, (char *)fbuf + fbuf->head_off, dump_size); 73 } 74 } 75 76 void ftrace_map_lr(uint64_t *lr) 77 { 78 if (fbuf) { 79 if (*lr == fbuf->ret_func_ptr && 80 fbuf->lr_idx < fbuf->ret_idx) { 81 fbuf->lr_idx++; 82 *lr = fbuf->ret_stack[fbuf->ret_idx - fbuf->lr_idx]; 83 } 84 } 85 } 86