1/*- 2 * Copyright (c) 2005 Antoine Brodin 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/systm.h> 31#include <sys/param.h> 32#include <sys/proc.h> 33#include <sys/stack.h> 34 35#include <machine/vmparam.h> 36#include <machine/pcb.h> 37#include <machine/stack.h> 38 39/* 40 * This code makes assumptions about the stack layout. These are correct 41 * when using APCS (the old ABI), but are no longer true with AAPCS and the 42 * ARM EABI. There is also an issue with clang and llvm when building for 43 * APCS where it lays out the stack incorrectly. Because of this we disable 44 * this when building for ARM EABI or when building with clang. 45 */ 46 47extern vm_offset_t kernel_vm_end; 48 49static void 50stack_capture(struct stack *st, u_int32_t *frame) 51{ 52#if !defined(__ARM_EABI__) && !defined(__clang__) 53 vm_offset_t callpc; 54 55 while (INKERNEL(frame) && (vm_offset_t)frame < kernel_vm_end) { 56 callpc = frame[FR_SCP]; 57 if (stack_put(st, callpc) == -1) 58 break; 59 frame = (u_int32_t *)(frame[FR_RFP]); 60 } 61#endif 62} 63 64void 65stack_save_td(struct stack *st, struct thread *td) 66{ 67 u_int32_t *frame; 68 69 if (TD_IS_SWAPPED(td)) 70 panic("stack_save_td: swapped"); 71 if (TD_IS_RUNNING(td)) 72 panic("stack_save_td: running"); 73 74 /* 75 * This register, the frame pointer, is incorrect for the ARM EABI 76 * as it doesn't have a frame pointer, however it's value is not used 77 * when building for EABI. 78 */ 79 frame = (u_int32_t *)td->td_pcb->un_32.pcb32_r11; 80 stack_zero(st); 81 stack_capture(st, frame); 82} 83 84void 85stack_save(struct stack *st) 86{ 87 u_int32_t *frame; 88 89 frame = (u_int32_t *)__builtin_frame_address(0); 90 stack_zero(st); 91 stack_capture(st, frame); 92} 93