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/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/proc.h> 43 #include <sys/stack.h> 44 45 #include <machine/vmparam.h> 46 #include <machine/pcb.h> 47 #include <machine/stack.h> 48 49 static void 50 stack_capture(struct stack *st, struct unwind_state *frame) 51 { 52 53 stack_zero(st); 54 55 while (1) { 56 unwind_frame(frame); 57 if (!INKERNEL((vm_offset_t)frame->fp) || 58 !INKERNEL((vm_offset_t)frame->pc)) 59 break; 60 if (stack_put(st, frame->pc) == -1) 61 break; 62 } 63 } 64 65 int 66 stack_save_td(struct stack *st, struct thread *td) 67 { 68 struct unwind_state frame; 69 70 THREAD_LOCK_ASSERT(td, MA_OWNED); 71 KASSERT(!TD_IS_SWAPPED(td), 72 ("stack_save_td: thread %p is swapped", td)); 73 74 if (TD_IS_RUNNING(td)) 75 return (EOPNOTSUPP); 76 77 frame.sp = td->td_pcb->pcb_sp; 78 frame.fp = td->td_pcb->pcb_s[0]; 79 frame.pc = td->td_pcb->pcb_ra; 80 81 stack_capture(st, &frame); 82 return (0); 83 } 84 85 void 86 stack_save(struct stack *st) 87 { 88 struct unwind_state frame; 89 uint64_t sp; 90 91 __asm __volatile("mv %0, sp" : "=&r" (sp)); 92 93 frame.sp = sp; 94 frame.fp = (uint64_t)__builtin_frame_address(0); 95 frame.pc = (uint64_t)stack_save; 96 97 stack_capture(st, &frame); 98 } 99