1 // SPDX-License-Identifier: BSD-2-Clause 2 /*- 3 * Copyright (c) 2015-2019 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 <compiler.h> 33 #include <string.h> 34 #include <trace.h> 35 #include <types_ext.h> 36 #include <unw/unwind.h> 37 #include <util.h> 38 39 void __weak ftrace_map_lr(uint64_t *lr __unused) 40 {} 41 42 void __weak pauth_strip_pac(uint64_t *lr __unused) 43 {} 44 45 static bool copy_in_reg(uint64_t *reg, vaddr_t addr) 46 { 47 memcpy(reg, (void *)addr, sizeof(*reg)); 48 return true; 49 } 50 51 bool unwind_stack_arm64(struct unwind_state_arm64 *frame, 52 vaddr_t stack, size_t stack_size) 53 { 54 vaddr_t fp = frame->fp; 55 56 if (fp < stack) 57 return false; 58 if (fp + sizeof(uint64_t) * 3 > 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)) 64 return false; 65 if (!frame->fp) 66 return false; 67 /* LR (X30) */ 68 if (!copy_in_reg(&frame->pc, fp + 8)) 69 return false; 70 71 pauth_strip_pac(&frame->pc); 72 73 ftrace_map_lr(&frame->pc); 74 75 frame->pc -= 4; 76 77 return true; 78 } 79 80 void print_stack_arm64(struct unwind_state_arm64 *state, 81 vaddr_t stack, size_t stack_size) 82 { 83 int width = 8; 84 85 trace_printf_helper_raw(TRACE_ERROR, true, "Call stack:"); 86 87 ftrace_map_lr(&state->pc); 88 do { 89 trace_printf_helper_raw(TRACE_ERROR, true, " 0x%0*"PRIx64, 90 width, state->pc); 91 } while (unwind_stack_arm64(state, stack, stack_size)); 92 } 93