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/proc.h> 37 #include <sys/stack.h> 38 39 #include <machine/vmparam.h> 40 #include <machine/pcb.h> 41 #include <machine/stack.h> 42 43 static void 44 stack_capture(struct stack *st, struct unwind_state *frame) 45 { 46 47 stack_zero(st); 48 while (1) { 49 unwind_frame(frame); 50 if (!INKERNEL((vm_offset_t)frame->fp) || 51 !INKERNEL((vm_offset_t)frame->pc)) 52 break; 53 if (stack_put(st, frame->pc) == -1) 54 break; 55 } 56 } 57 58 void 59 stack_save_td(struct stack *st, struct thread *td) 60 { 61 struct unwind_state frame; 62 63 if (TD_IS_SWAPPED(td)) 64 panic("stack_save_td: swapped"); 65 if (TD_IS_RUNNING(td)) 66 panic("stack_save_td: running"); 67 68 frame.sp = td->td_pcb->pcb_sp; 69 frame.fp = td->td_pcb->pcb_x[29]; 70 frame.pc = td->td_pcb->pcb_x[30]; 71 72 stack_capture(st, &frame); 73 } 74 75 int 76 stack_save_td_running(struct stack *st, struct thread *td) 77 { 78 79 return (EOPNOTSUPP); 80 } 81 82 void 83 stack_save(struct stack *st) 84 { 85 struct unwind_state frame; 86 uint64_t sp; 87 88 __asm __volatile("mov %0, sp" : "=&r" (sp)); 89 90 frame.sp = sp; 91 frame.fp = (uint64_t)__builtin_frame_address(0); 92 frame.pc = (uint64_t)stack_save; 93 94 stack_capture(st, &frame); 95 } 96