1 /*- 2 * Copyright (c) 2005 Antoine Brodin 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/proc.h> 32 #include <sys/stack.h> 33 #include <sys/systm.h> 34 35 #include <vm/vm.h> 36 #include <vm/pmap.h> 37 #include <vm/vm_extern.h> 38 39 #include <machine/db_machdep.h> 40 #include <machine/pcb.h> 41 #include <machine/spr.h> 42 #include <machine/stack.h> 43 #include <machine/trap.h> 44 45 #ifdef __powerpc64__ 46 #define CALLOFFSET 8 /* Account for the TOC reload slot */ 47 #else 48 #define CALLOFFSET 4 49 #endif 50 51 static void 52 stack_capture(struct stack *st, vm_offset_t frame) 53 { 54 vm_offset_t callpc; 55 56 stack_zero(st); 57 if (frame < PAGE_SIZE) 58 return; 59 while (1) { 60 frame = *(vm_offset_t *)frame; 61 if (frame < PAGE_SIZE) 62 break; 63 64 #ifdef __powerpc64__ 65 callpc = *(vm_offset_t *)(frame + 16) - 4; 66 #else 67 callpc = *(vm_offset_t *)(frame + 4) - 4; 68 #endif 69 if ((callpc & 3) || (callpc < 0x100)) 70 break; 71 72 /* 73 * Don't bother traversing trap-frames - there should 74 * be enough info down to the frame to work out where 75 * things are going wrong. Plus, prevents this shortened 76 * version of code from accessing user-space frames 77 */ 78 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit || 79 callpc + CALLOFFSET == (vm_offset_t) &asttrapexit) 80 break; 81 82 if (stack_put(st, callpc) == -1) 83 break; 84 } 85 } 86 87 void 88 stack_save_td(struct stack *st, struct thread *td) 89 { 90 vm_offset_t frame; 91 92 if (TD_IS_SWAPPED(td)) 93 panic("stack_save_td: swapped"); 94 if (TD_IS_RUNNING(td)) 95 panic("stack_save_td: running"); 96 97 frame = td->td_pcb->pcb_sp; 98 stack_capture(st, frame); 99 } 100 101 int 102 stack_save_td_running(struct stack *st, struct thread *td) 103 { 104 105 return (EOPNOTSUPP); 106 } 107 108 void 109 stack_save(struct stack *st) 110 { 111 register_t frame; 112 113 frame = (register_t)__builtin_frame_address(0); 114 stack_capture(st, frame); 115 } 116