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 <memtag.h> 34 #include <string.h> 35 #include <trace.h> 36 #include <types_ext.h> 37 #include <unw/unwind.h> 38 #include <util.h> 39 40 void __weak ftrace_map_lr(uint64_t *lr __unused) 41 {} 42 43 void __weak pauth_strip_pac(uint64_t *lr __unused) 44 {} 45 46 static bool copy_in_reg(uint64_t *reg, vaddr_t addr) 47 { 48 memcpy(reg, (void *)addr, sizeof(*reg)); 49 return true; 50 } 51 52 bool unwind_stack_arm64(struct unwind_state_arm64 *frame, 53 vaddr_t stack, size_t stack_size) 54 { 55 vaddr_t fp = frame->fp; 56 57 if (fp < stack) 58 return false; 59 if (fp + sizeof(uint64_t) * 3 > stack + stack_size) 60 return false; 61 62 frame->sp = fp + 0x10; 63 /* FP to previous frame (X29) */ 64 if (!copy_in_reg(&frame->fp, fp)) 65 return false; 66 if (!frame->fp) 67 return false; 68 /* LR (X30) */ 69 if (!copy_in_reg(&frame->pc, fp + 8)) 70 return false; 71 72 pauth_strip_pac(&frame->pc); 73 74 ftrace_map_lr(&frame->pc); 75 76 frame->pc -= 4; 77 78 return true; 79 } 80 81 void print_stack_arm64(struct unwind_state_arm64 *state, 82 vaddr_t stack, size_t stack_size) 83 { 84 vaddr_t va = 0; 85 int width = 8; 86 87 trace_printf_helper_raw(TRACE_ERROR, true, "Call stack:"); 88 89 ftrace_map_lr(&state->pc); 90 do { 91 va = memtag_strip_tag_vaddr((void *)state->pc); 92 trace_printf_helper_raw(TRACE_ERROR, true, " 0x%0*"PRIxVA, 93 width, va); 94 } while (unwind_stack_arm64(state, stack, stack_size)); 95 } 96