1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Andrew Turner under 6 * sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/lock.h> 37 #include <sys/mutex.h> 38 #include <sys/proc.h> 39 #include <sys/stack.h> 40 41 #include <machine/vmparam.h> 42 #include <machine/pcb.h> 43 #include <machine/stack.h> 44 45 static void 46 stack_capture(struct stack *st, struct unwind_state *frame) 47 { 48 49 stack_zero(st); 50 while (1) { 51 unwind_frame(frame); 52 if (!INKERNEL((vm_offset_t)frame->fp) || 53 !INKERNEL((vm_offset_t)frame->pc)) 54 break; 55 if (stack_put(st, frame->pc) == -1) 56 break; 57 } 58 } 59 60 int 61 stack_save_td(struct stack *st, struct thread *td) 62 { 63 struct unwind_state frame; 64 65 THREAD_LOCK_ASSERT(td, MA_OWNED); 66 KASSERT(!TD_IS_SWAPPED(td), 67 ("stack_save_td: thread %p is swapped", td)); 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_x[29]; 74 frame.pc = td->td_pcb->pcb_x[30]; 75 76 stack_capture(st, &frame); 77 return (0); 78 } 79 80 void 81 stack_save(struct stack *st) 82 { 83 struct unwind_state frame; 84 uint64_t sp; 85 86 __asm __volatile("mov %0, sp" : "=&r" (sp)); 87 88 frame.sp = sp; 89 frame.fp = (uint64_t)__builtin_frame_address(0); 90 frame.pc = (uint64_t)stack_save; 91 92 stack_capture(st, &frame); 93 } 94