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 return false; 60 61 frame->sp = fp + 0x10; 62 /* FP to previous frame (X29) */ 63 if (!copy_in_reg(&frame->fp, fp, kernel_stack)) 64 return false; 65 /* LR (X30) */ 66 if (!copy_in_reg(&frame->pc, fp + 8, kernel_stack)) 67 return false; 68 frame->pc -= 4; 69 70 return true; 71 } 72 73 #if (TRACE_LEVEL > 0) 74 75 void print_stack_arm64(int level, struct unwind_state_arm64 *state, 76 bool kernel_stack, vaddr_t stack, size_t stack_size) 77 { 78 trace_printf_helper_raw(level, true, "Call stack:"); 79 do { 80 trace_printf_helper_raw(level, true, " 0x%016" PRIx64, 81 state->pc); 82 } while (unwind_stack_arm64(state, kernel_stack, stack, stack_size)); 83 } 84 85 void print_kernel_stack(int level) 86 { 87 struct unwind_state_arm64 state; 88 uaddr_t stack = thread_stack_start(); 89 size_t stack_size = thread_stack_size(); 90 91 memset(&state, 0, sizeof(state)); 92 state.pc = read_pc(); 93 state.fp = read_fp(); 94 95 print_stack_arm64(level, &state, 96 true /*kernel_stack*/, stack, stack_size); 97 } 98 99 #endif 100 101 vaddr_t *unw_get_kernel_stack(void) 102 { 103 size_t n = 0; 104 size_t size = 0; 105 vaddr_t *tmp = NULL; 106 vaddr_t *addr = NULL; 107 struct unwind_state_arm64 state = { 0 }; 108 uaddr_t stack = thread_stack_start(); 109 size_t stack_size = thread_stack_size(); 110 111 state.pc = read_pc(); 112 state.fp = read_fp(); 113 114 while (unwind_stack_arm64(&state, true /*kernel stack*/, 115 stack, stack_size)) { 116 tmp = unw_grow(addr, &size, (n + 1) * sizeof(vaddr_t)); 117 if (!tmp) 118 goto err; 119 addr = tmp; 120 addr[n] = state.pc; 121 n++; 122 } 123 124 if (addr) { 125 tmp = unw_grow(addr, &size, (n + 1) * sizeof(vaddr_t)); 126 if (!tmp) 127 goto err; 128 addr = tmp; 129 addr[n] = 0; 130 } 131 132 return addr; 133 err: 134 EMSG("Out of memory"); 135 free(addr); 136 return NULL; 137 } 138