1 /*- 2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by the University of Cambridge Computer 6 * Laboratory with support from ARM Ltd. 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 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/pmc.h> 35 #include <sys/proc.h> 36 #include <sys/systm.h> 37 38 #include <machine/cpu.h> 39 #include <machine/md_var.h> 40 #include <machine/pmc_mdep.h> 41 #include <machine/stack.h> 42 43 #include <vm/vm.h> 44 #include <vm/vm_param.h> 45 #include <vm/pmap.h> 46 47 struct pmc_mdep * 48 pmc_md_initialize() 49 { 50 51 return (pmc_arm64_initialize()); 52 } 53 54 void 55 pmc_md_finalize(struct pmc_mdep *md) 56 { 57 58 pmc_arm64_finalize(md); 59 } 60 61 int 62 pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples, 63 struct trapframe *tf) 64 { 65 uintptr_t pc, r, stackstart, stackend, fp; 66 struct thread *td; 67 int count; 68 69 KASSERT(TRAPF_USERMODE(tf) == 0,("[arm64,%d] not a kernel backtrace", 70 __LINE__)); 71 72 td = curthread; 73 pc = PMC_TRAPFRAME_TO_PC(tf); 74 *cc++ = pc; 75 76 if (maxsamples <= 1) 77 return (1); 78 79 stackstart = (uintptr_t) td->td_kstack; 80 stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE; 81 fp = PMC_TRAPFRAME_TO_FP(tf); 82 83 if (!PMC_IN_KERNEL(pc) || 84 !PMC_IN_KERNEL_STACK(fp, stackstart, stackend)) 85 return (1); 86 87 for (count = 1; count < maxsamples; count++) { 88 /* Use saved lr as pc. */ 89 r = fp + sizeof(uintptr_t); 90 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend)) 91 break; 92 pc = *(uintptr_t *)r; 93 if (!PMC_IN_KERNEL(pc)) 94 break; 95 96 *cc++ = pc; 97 98 /* Switch to next frame up */ 99 r = fp; 100 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend)) 101 break; 102 fp = *(uintptr_t *)r; 103 if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend)) 104 break; 105 } 106 107 return (count); 108 } 109 110 int 111 pmc_save_user_callchain(uintptr_t *cc, int maxsamples, 112 struct trapframe *tf) 113 { 114 uintptr_t pc, r, oldfp, fp; 115 struct thread *td; 116 int count; 117 118 KASSERT(TRAPF_USERMODE(tf), ("[arm64,%d] Not a user trap frame tf=%p", 119 __LINE__, (void *) tf)); 120 121 td = curthread; 122 pc = PMC_TRAPFRAME_TO_PC(tf); 123 *cc++ = pc; 124 125 if (maxsamples <= 1) 126 return (1); 127 128 oldfp = fp = PMC_TRAPFRAME_TO_FP(tf); 129 130 if (!PMC_IN_USERSPACE(pc) || 131 !PMC_IN_USERSPACE(fp)) 132 return (1); 133 134 for (count = 1; count < maxsamples; count++) { 135 /* Use saved lr as pc. */ 136 r = fp + sizeof(uintptr_t); 137 if (copyin((void *)r, &pc, sizeof(pc)) != 0) 138 break; 139 if (!PMC_IN_USERSPACE(pc)) 140 break; 141 142 *cc++ = pc; 143 144 /* Switch to next frame up */ 145 oldfp = fp; 146 r = fp; 147 if (copyin((void *)r, &fp, sizeof(fp)) != 0) 148 break; 149 if (fp < oldfp || !PMC_IN_USERSPACE(fp)) 150 break; 151 } 152 153 return (count); 154 } 155