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.ptr64, finfo->buf_start.ptr64, 39 &fbuf_size)) 40 return false; 41 42 if (fbuf_size < MIN_FTRACE_BUF_SIZE) { 43 DMSG("ftrace buffer too small"); 44 return false; 45 } 46 47 fbuf = (struct ftrace_buf *)finfo->buf_start.ptr64; 48 fbuf->head_off = sizeof(struct ftrace_buf); 49 count = snprintk((char *)fbuf + fbuf->head_off, MAX_HEADER_STRLEN, 50 "Function graph for TA: %pUl @ %lx\n", 51 (void *)&elf->uuid, elf->load_addr); 52 assert(count < MAX_HEADER_STRLEN); 53 54 fbuf->ret_func_ptr = finfo->ret_ptr.ptr64; 55 fbuf->ret_idx = 0; 56 fbuf->lr_idx = 0; 57 fbuf->buf_off = fbuf->head_off + count; 58 fbuf->curr_size = 0; 59 fbuf->max_size = fbuf_size - sizeof(struct ftrace_buf) - count; 60 61 return true; 62 } 63 64 void ftrace_copy_buf(void *pctx, void (*copy_func)(void *pctx, void *b, 65 size_t bl)) 66 { 67 if (fbuf) { 68 struct ta_elf *elf = TAILQ_FIRST(&main_elf_queue); 69 size_t dump_size = fbuf->buf_off - fbuf->head_off + 70 fbuf->curr_size; 71 72 assert(elf && elf->is_main); 73 copy_func(pctx, (char *)fbuf + fbuf->head_off, dump_size); 74 } 75 } 76 77 void ftrace_map_lr(uint64_t *lr) 78 { 79 if (fbuf) { 80 if (*lr == fbuf->ret_func_ptr && 81 fbuf->lr_idx < fbuf->ret_idx) { 82 fbuf->lr_idx++; 83 *lr = fbuf->ret_stack[fbuf->ret_idx - fbuf->lr_idx]; 84 } 85 } 86 } 87