1 /*- 2 * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * Portions of this software were developed by SRI International and the 6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract 7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Portions of this software were developed by the University of Cambridge 10 * Computer Laboratory as part of the CTSRD Project, with support from the 11 * UK Higher Education Innovation Fund (HEIF). 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/stack.h> 42 43 #include <machine/vmparam.h> 44 #include <machine/pcb.h> 45 #include <machine/stack.h> 46 47 static void 48 stack_capture(struct stack *st, struct unwind_state *frame) 49 { 50 51 stack_zero(st); 52 53 while (1) { 54 unwind_frame(frame); 55 if (!INKERNEL((vm_offset_t)frame->fp) || 56 !INKERNEL((vm_offset_t)frame->pc)) 57 break; 58 if (stack_put(st, frame->pc) == -1) 59 break; 60 } 61 } 62 63 void 64 stack_save_td(struct stack *st, struct thread *td) 65 { 66 struct unwind_state frame; 67 68 if (TD_IS_SWAPPED(td)) 69 panic("stack_save_td: swapped"); 70 if (TD_IS_RUNNING(td)) 71 panic("stack_save_td: running"); 72 73 frame.sp = td->td_pcb->pcb_sp; 74 frame.fp = td->td_pcb->pcb_s[0]; 75 frame.pc = td->td_pcb->pcb_ra; 76 77 stack_capture(st, &frame); 78 } 79 80 int 81 stack_save_td_running(struct stack *st, struct thread *td) 82 { 83 84 return (EOPNOTSUPP); 85 } 86 87 void 88 stack_save(struct stack *st) 89 { 90 struct unwind_state frame; 91 uint64_t sp; 92 93 __asm __volatile("mv %0, sp" : "=&r" (sp)); 94 95 frame.sp = sp; 96 frame.fp = (uint64_t)__builtin_frame_address(0); 97 frame.pc = (uint64_t)stack_save; 98 99 stack_capture(st, &frame); 100 } 101