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 static void 46 stack_capture(struct stack *st, vm_offset_t frame) 47 { 48 vm_offset_t callpc; 49 50 stack_zero(st); 51 if (frame < PAGE_SIZE) 52 return; 53 while (1) { 54 frame = *(register_t *)frame; 55 if (frame < PAGE_SIZE) 56 break; 57 callpc = *(vm_offset_t *)(frame + 4) - 4; 58 if ((callpc & 3) || (callpc < 0x100)) 59 break; 60 61 /* 62 * Don't bother traversing trap-frames - there should 63 * be enough info down to the frame to work out where 64 * things are going wrong. Plus, prevents this shortened 65 * version of code from accessing user-space frames 66 */ 67 if (callpc + 4 == (register_t) &trapexit || 68 callpc + 4 == (register_t) &asttrapexit) 69 break; 70 71 if (stack_put(st, callpc) == -1) 72 break; 73 } 74 } 75 76 void 77 stack_save_td(struct stack *st, struct thread *td) 78 { 79 vm_offset_t frame; 80 81 if (TD_IS_SWAPPED(td)) 82 panic("stack_save_td: swapped"); 83 if (TD_IS_RUNNING(td)) 84 panic("stack_save_td: running"); 85 86 frame = td->td_pcb->pcb_sp; 87 stack_capture(st, frame); 88 } 89 90 void 91 stack_save(struct stack *st) 92 { 93 register_t frame; 94 95 frame = (register_t)__builtin_frame_address(1); 96 stack_capture(st, frame); 97 } 98