1 // SPDX-License-Identifier: BSD-2-Clause 2 /*- 3 * Copyright (c) 2015 Linaro Limited 4 * Copyright (c) 2015 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Semihalf under 8 * the sponsorship of the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <arm.h> 33 #include <kernel/thread.h> 34 #include <kernel/unwind.h> 35 #include <kernel/tee_misc.h> 36 #include <string.h> 37 #include <tee/tee_svc.h> 38 #include <trace.h> 39 #include <util.h> 40 41 #include "unwind_private.h" 42 43 static bool copy_in_reg(uint64_t *reg, vaddr_t addr, bool kernel_data) 44 { 45 if (!kernel_data) 46 return !tee_svc_copy_from_user(reg, (void *)addr, sizeof(*reg)); 47 48 memcpy(reg, (void *)addr, sizeof(*reg)); 49 return true; 50 } 51 52 bool unwind_stack_arm64(struct unwind_state_arm64 *frame, bool kernel_stack, 53 vaddr_t stack, size_t stack_size) 54 { 55 vaddr_t fp = frame->fp; 56 57 if (!core_is_buffer_inside(fp, sizeof(uint64_t) * 3, 58 stack, stack_size)) { 59 DMSG("FP out of bounds %#" PRIxVA, fp); 60 return false; 61 } 62 63 frame->sp = fp + 0x10; 64 /* FP to previous frame (X29) */ 65 if (!copy_in_reg(&frame->fp, fp, kernel_stack)) 66 return false; 67 /* LR (X30) */ 68 if (!copy_in_reg(&frame->pc, fp + 8, kernel_stack)) 69 return false; 70 frame->pc -= 4; 71 72 return true; 73 } 74 75 #if defined(CFG_UNWIND) && (TRACE_LEVEL > 0) 76 77 void print_stack_arm64(int level, struct unwind_state_arm64 *state, 78 bool kernel_stack, vaddr_t stack, size_t stack_size) 79 { 80 trace_printf_helper_raw(level, true, "Call stack:"); 81 do { 82 trace_printf_helper_raw(level, true, " 0x%016" PRIx64, 83 state->pc); 84 } while (unwind_stack_arm64(state, kernel_stack, stack, stack_size)); 85 } 86 87 void print_kernel_stack(int level) 88 { 89 struct unwind_state_arm64 state; 90 uaddr_t stack = thread_stack_start(); 91 size_t stack_size = thread_stack_size(); 92 93 memset(&state, 0, sizeof(state)); 94 state.pc = read_pc(); 95 state.fp = read_fp(); 96 97 print_stack_arm64(level, &state, 98 true /*kernel_stack*/, stack, stack_size); 99 } 100 101 #endif 102 103 vaddr_t *unw_get_kernel_stack(void) 104 { 105 size_t n = 0; 106 size_t size = 0; 107 vaddr_t *tmp = NULL; 108 vaddr_t *addr = NULL; 109 struct unwind_state_arm64 state = { 0 }; 110 uaddr_t stack = thread_stack_start(); 111 size_t stack_size = thread_stack_size(); 112 113 state.pc = read_pc(); 114 state.fp = read_fp(); 115 116 while (unwind_stack_arm64(&state, true /*kernel stack*/, 117 stack, stack_size)) { 118 tmp = unw_grow(addr, &size, (n + 1) * sizeof(vaddr_t)); 119 if (!tmp) 120 goto err; 121 addr = tmp; 122 addr[n] = state.pc; 123 n++; 124 } 125 126 if (addr) { 127 tmp = unw_grow(addr, &size, (n + 1) * sizeof(vaddr_t)); 128 if (!tmp) 129 goto err; 130 addr = tmp; 131 addr[n] = 0; 132 } 133 134 return addr; 135 err: 136 EMSG("Out of memory"); 137 free(addr); 138 return NULL; 139 } 140