1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/stack.h> 35 #include <sys/systm.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 #include <vm/vm_extern.h> 40 41 #include <machine/db_machdep.h> 42 #include <machine/pcb.h> 43 #include <machine/spr.h> 44 #include <machine/stack.h> 45 #include <machine/trap.h> 46 47 #ifdef __powerpc64__ 48 #define CALLOFFSET 8 /* Account for the TOC reload slot */ 49 #else 50 #define CALLOFFSET 4 51 #endif 52 53 static void 54 stack_capture(struct stack *st, vm_offset_t frame) 55 { 56 vm_offset_t callpc; 57 58 stack_zero(st); 59 if (frame < PAGE_SIZE) 60 return; 61 while (1) { 62 frame = *(vm_offset_t *)frame; 63 if (frame < PAGE_SIZE) 64 break; 65 66 #ifdef __powerpc64__ 67 callpc = *(vm_offset_t *)(frame + 16) - 4; 68 #else 69 callpc = *(vm_offset_t *)(frame + 4) - 4; 70 #endif 71 if ((callpc & 3) || (callpc < 0x100)) 72 break; 73 74 /* 75 * Don't bother traversing trap-frames - there should 76 * be enough info down to the frame to work out where 77 * things are going wrong. Plus, prevents this shortened 78 * version of code from accessing user-space frames 79 */ 80 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit || 81 callpc + CALLOFFSET == (vm_offset_t) &asttrapexit) 82 break; 83 84 if (stack_put(st, callpc) == -1) 85 break; 86 } 87 } 88 89 void 90 stack_save_td(struct stack *st, struct thread *td) 91 { 92 vm_offset_t frame; 93 94 if (TD_IS_SWAPPED(td)) 95 panic("stack_save_td: swapped"); 96 if (TD_IS_RUNNING(td)) 97 panic("stack_save_td: running"); 98 99 frame = td->td_pcb->pcb_sp; 100 stack_capture(st, frame); 101 } 102 103 int 104 stack_save_td_running(struct stack *st, struct thread *td) 105 { 106 107 return (EOPNOTSUPP); 108 } 109 110 void 111 stack_save(struct stack *st) 112 { 113 register_t frame; 114 115 frame = (register_t)__builtin_frame_address(0); 116 stack_capture(st, frame); 117 } 118