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/param.h> 36 #include <sys/systm.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/proc.h> 40 #include <sys/stack.h> 41 42 #include <machine/vmparam.h> 43 #include <machine/pcb.h> 44 #include <machine/stack.h> 45 46 static void 47 stack_capture(struct thread *td, struct stack *st, struct unwind_state *frame) 48 { 49 50 stack_zero(st); 51 52 while (1) { 53 if (!unwind_frame(td, frame)) 54 break; 55 if (!INKERNEL((vm_offset_t)frame->pc)) 56 break; 57 if (stack_put(st, frame->pc) == -1) 58 break; 59 } 60 } 61 62 int 63 stack_save_td(struct stack *st, struct thread *td) 64 { 65 struct unwind_state frame; 66 67 THREAD_LOCK_ASSERT(td, MA_OWNED); 68 69 if (TD_IS_RUNNING(td)) 70 return (EOPNOTSUPP); 71 72 frame.sp = td->td_pcb->pcb_sp; 73 frame.fp = td->td_pcb->pcb_s[0]; 74 frame.pc = td->td_pcb->pcb_ra; 75 76 stack_capture(td, st, &frame); 77 return (0); 78 } 79 80 void 81 stack_save(struct stack *st) 82 { 83 struct unwind_state frame; 84 uintptr_t sp; 85 86 __asm __volatile("mv %0, sp" : "=&r" (sp)); 87 88 frame.sp = sp; 89 frame.fp = (uintptr_t)__builtin_frame_address(0); 90 frame.pc = (uintptr_t)stack_save; 91 92 stack_capture(curthread, st, &frame); 93 } 94