1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2005 Antoine Brodin 5 * All rights reserved. 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 #include <sys/param.h> 30 #include <sys/lock.h> 31 #include <sys/mutex.h> 32 #include <sys/proc.h> 33 #include <sys/stack.h> 34 #include <sys/systm.h> 35 36 #include <vm/vm.h> 37 #include <vm/pmap.h> 38 #include <vm/vm_extern.h> 39 40 #include <machine/db_machdep.h> 41 #include <machine/pcb.h> 42 #include <machine/spr.h> 43 #include <machine/stack.h> 44 #include <machine/trap.h> 45 46 #ifdef __powerpc64__ 47 #define CALLOFFSET 8 /* Account for the TOC reload slot */ 48 #else 49 #define CALLOFFSET 4 50 #endif 51 52 static void 53 stack_capture(struct stack *st, vm_offset_t frame) 54 { 55 vm_offset_t callpc; 56 57 stack_zero(st); 58 if (frame < PAGE_SIZE) 59 return; 60 while (1) { 61 frame = *(vm_offset_t *)frame; 62 if (frame < PAGE_SIZE) 63 break; 64 65 #ifdef __powerpc64__ 66 callpc = *(vm_offset_t *)(frame + 16) - 4; 67 #else 68 callpc = *(vm_offset_t *)(frame + 4) - 4; 69 #endif 70 if ((callpc & 3) || (callpc < 0x100)) 71 break; 72 73 /* 74 * Don't bother traversing trap-frames - there should 75 * be enough info down to the frame to work out where 76 * things are going wrong. Plus, prevents this shortened 77 * version of code from accessing user-space frames 78 */ 79 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit || 80 callpc + CALLOFFSET == (vm_offset_t) &asttrapexit) 81 break; 82 83 if (stack_put(st, callpc) == -1) 84 break; 85 } 86 } 87 88 int 89 stack_save_td(struct stack *st, struct thread *td) 90 { 91 vm_offset_t frame; 92 93 THREAD_LOCK_ASSERT(td, MA_OWNED); 94 KASSERT(!TD_IS_SWAPPED(td), 95 ("stack_save_td: thread %p is swapped", td)); 96 97 if (TD_IS_RUNNING(td)) 98 return (EOPNOTSUPP); 99 100 frame = td->td_pcb->pcb_sp; 101 stack_capture(st, frame); 102 return (0); 103 } 104 105 void 106 stack_save(struct stack *st) 107 { 108 register_t frame; 109 110 frame = (register_t)__builtin_frame_address(0); 111 stack_capture(st, frame); 112 } 113