1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Antoine Brodin 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/proc.h> 35 #include <sys/stack.h> 36 37 #include <machine/vmparam.h> 38 #include <machine/pcb.h> 39 #include <machine/stack.h> 40 41 /* 42 * This code makes assumptions about the stack layout. These are correct 43 * when using APCS (the old ABI), but are no longer true with AAPCS and the 44 * ARM EABI. There is also an issue with clang and llvm when building for 45 * APCS where it lays out the stack incorrectly. Because of this we disable 46 * this when building for ARM EABI or when building with clang. 47 */ 48 49 extern vm_offset_t kernel_vm_end; 50 51 static void 52 stack_capture(struct stack *st, u_int32_t *frame) 53 { 54 } 55 56 void 57 stack_save_td(struct stack *st, struct thread *td) 58 { 59 u_int32_t *frame; 60 61 if (TD_IS_SWAPPED(td)) 62 panic("stack_save_td: swapped"); 63 if (TD_IS_RUNNING(td)) 64 panic("stack_save_td: running"); 65 66 /* 67 * This register, the frame pointer, is incorrect for the ARM EABI 68 * as it doesn't have a frame pointer, however it's value is not used 69 * when building for EABI. 70 */ 71 frame = (u_int32_t *)td->td_pcb->pcb_regs.sf_r11; 72 stack_zero(st); 73 stack_capture(st, frame); 74 } 75 76 int 77 stack_save_td_running(struct stack *st, struct thread *td) 78 { 79 80 return (EOPNOTSUPP); 81 } 82 83 void 84 stack_save(struct stack *st) 85 { 86 u_int32_t *frame; 87 88 frame = (u_int32_t *)__builtin_frame_address(0); 89 stack_zero(st); 90 stack_capture(st, frame); 91 } 92