1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * This software was developed by Andrew Turner under 5 * sponsorship from the FreeBSD Foundation. 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/proc.h> 38 #include <sys/stack.h> 39 40 #include <machine/vmparam.h> 41 #include <machine/pcb.h> 42 #include <machine/stack.h> 43 44 static void 45 stack_capture(struct thread *td, struct stack *st, struct unwind_state *frame) 46 { 47 48 stack_zero(st); 49 while (1) { 50 if (!unwind_frame(td, frame)) 51 break; 52 if (!INKERNEL((vm_offset_t)frame->pc)) 53 break; 54 if (stack_put(st, frame->pc) == -1) 55 break; 56 } 57 } 58 59 int 60 stack_save_td(struct stack *st, struct thread *td) 61 { 62 struct unwind_state frame; 63 64 THREAD_LOCK_ASSERT(td, MA_OWNED); 65 KASSERT(!TD_IS_SWAPPED(td), 66 ("stack_save_td: thread %p is swapped", td)); 67 68 if (TD_IS_RUNNING(td)) 69 return (EOPNOTSUPP); 70 71 frame.fp = td->td_pcb->pcb_x[29]; 72 frame.pc = td->td_pcb->pcb_lr; 73 74 stack_capture(td, st, &frame); 75 return (0); 76 } 77 78 void 79 stack_save(struct stack *st) 80 { 81 struct unwind_state frame; 82 83 frame.fp = (uintptr_t)__builtin_frame_address(0); 84 frame.pc = (uintptr_t)stack_save; 85 86 stack_capture(curthread, st, &frame); 87 } 88