Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/fbt/aarch64/fbt_isa.c
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1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * 21 * Portions Copyright 2006-2008 John Birrell jb@freebsd.org 22 * Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org 23 * Portions Copyright 2013 Howard Su howardsu@freebsd.org 24 * Portions Copyright 2015 Ruslan Bukin <br@bsdpad.com> 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 31 * Use is subject to license terms. 32 */ 33 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 37 #include <sys/dtrace.h> 38 39 #include "fbt.h" 40 41 #define AARCH64_BRK 0xd4200000 42 #define AARCH64_BRK_IMM16_SHIFT 5 43 #define AARCH64_BRK_IMM16_VAL (0x40d << AARCH64_BRK_IMM16_SHIFT) 44 #define FBT_PATCHVAL (AARCH64_BRK | AARCH64_BRK_IMM16_VAL) 45 #define FBT_ENTRY "entry" 46 #define FBT_RETURN "return" 47 #define FBT_AFRAMES 4 48 49 int 50 fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval) 51 { 52 solaris_cpu_t *cpu; 53 fbt_probe_t *fbt; 54 55 cpu = &solaris_cpu[curcpu]; 56 fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 57 58 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 59 if ((uintptr_t)fbt->fbtp_patchpoint != addr) 60 continue; 61 62 cpu->cpu_dtrace_caller = addr; 63 64 if (fbt->fbtp_roffset == 0) { 65 dtrace_probe(fbt->fbtp_id, frame->tf_x[0], 66 frame->tf_x[1], frame->tf_x[2], 67 frame->tf_x[3], frame->tf_x[4]); 68 } else { 69 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval, 70 0, 0, 0); 71 } 72 cpu->cpu_dtrace_caller = 0; 73 return (fbt->fbtp_savedval); 74 } 75 76 return (0); 77 } 78 79 void 80 fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val) 81 { 82 vm_offset_t addr; 83 84 if (!arm64_get_writable_addr((vm_offset_t)fbt->fbtp_patchpoint, &addr)) 85 panic("%s: Unable to write new instruction", __func__); 86 87 *(fbt_patchval_t *)addr = val; 88 cpu_icache_sync_range((vm_offset_t)fbt->fbtp_patchpoint, 4); 89 } 90 91 int 92 fbt_provide_module_function(linker_file_t lf, int symindx, 93 linker_symval_t *symval, void *opaque) 94 { 95 fbt_probe_t *fbt, *retfbt; 96 uint32_t *target, *start; 97 uint32_t *instr, *limit; 98 const char *name; 99 char *modname; 100 bool found; 101 int offs; 102 103 modname = opaque; 104 name = symval->name; 105 106 /* Check if function is excluded from instrumentation */ 107 if (fbt_excluded(name)) 108 return (0); 109 110 /* 111 * Instrumenting certain exception handling functions can lead to FBT 112 * recursion, so exclude from instrumentation. 113 */ 114 if (strcmp(name, "handle_el1h_sync") == 0 || 115 strcmp(name, "do_el1h_sync") == 0) 116 return (1); 117 118 instr = (uint32_t *)(symval->value); 119 limit = (uint32_t *)(symval->value + symval->size); 120 121 /* 122 * Ignore any bti instruction at the start of the function 123 * we need to keep it there for any indirect branches calling 124 * the function on Armv8.5+ 125 */ 126 if ((*instr & BTI_MASK) == BTI_INSTR) 127 instr++; 128 129 /* Look for stp (pre-indexed) operation */ 130 found = false; 131 /* 132 * If the first instruction is a nop it's a specially marked 133 * asm function. We only support a nop first as it's not a normal 134 * part of the function prologue. 135 */ 136 if (*instr == NOP_INSTR) 137 found = true; 138 if (!found) { 139 for (; instr < limit; instr++) { 140 /* 141 * Some functions start with 142 * "stp xt1, xt2, [xn, <const>]!" 143 */ 144 if ((*instr & LDP_STP_MASK) == STP_64) { 145 /* 146 * Assume any other store of this type means we 147 * are past the function prolog. 148 */ 149 if (((*instr >> ADDR_SHIFT) & ADDR_MASK) == 31) 150 found = true; 151 break; 152 } 153 154 /* 155 * Some functions start with a "sub sp, sp, <const>" 156 * Sometimes the compiler will have a sub instruction 157 * that is not of the above type so don't stop if we 158 * see one. 159 */ 160 if ((*instr & SUB_MASK) == SUB_INSTR && 161 ((*instr >> SUB_RD_SHIFT) & SUB_R_MASK) == 31 && 162 ((*instr >> SUB_RN_SHIFT) & SUB_R_MASK) == 31) { 163 found = true; 164 break; 165 } 166 } 167 } 168 169 if (!found) 170 return (0); 171 172 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 173 fbt->fbtp_name = name; 174 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 175 name, FBT_ENTRY, FBT_AFRAMES, fbt); 176 fbt->fbtp_patchpoint = instr; 177 fbt->fbtp_ctl = lf; 178 fbt->fbtp_loadcnt = lf->loadcnt; 179 fbt->fbtp_savedval = *instr; 180 fbt->fbtp_patchval = FBT_PATCHVAL; 181 if ((*instr & SUB_MASK) == SUB_INSTR) 182 fbt->fbtp_rval = DTRACE_INVOP_SUB; 183 else 184 fbt->fbtp_rval = DTRACE_INVOP_STP; 185 fbt->fbtp_symindx = symindx; 186 187 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 188 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 189 190 lf->fbt_nentries++; 191 192 retfbt = NULL; 193 again: 194 for (; instr < limit; instr++) { 195 if (*instr == RET_INSTR) 196 break; 197 else if ((*instr & B_MASK) == B_INSTR) { 198 offs = (*instr & B_DATA_MASK); 199 offs *= 4; 200 target = (instr + offs); 201 start = (uint32_t *)symval->value; 202 if (target >= limit || target < start) 203 break; 204 } 205 } 206 207 if (instr >= limit) 208 return (0); 209 210 /* 211 * We have a winner! 212 */ 213 fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO); 214 fbt->fbtp_name = name; 215 if (retfbt == NULL) { 216 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 217 name, FBT_RETURN, FBT_AFRAMES, fbt); 218 } else { 219 retfbt->fbtp_probenext = fbt; 220 fbt->fbtp_id = retfbt->fbtp_id; 221 } 222 retfbt = fbt; 223 224 fbt->fbtp_patchpoint = instr; 225 fbt->fbtp_ctl = lf; 226 fbt->fbtp_loadcnt = lf->loadcnt; 227 fbt->fbtp_symindx = symindx; 228 if ((*instr & B_MASK) == B_INSTR) 229 fbt->fbtp_rval = DTRACE_INVOP_B; 230 else 231 fbt->fbtp_rval = DTRACE_INVOP_RET; 232 fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value; 233 fbt->fbtp_savedval = *instr; 234 fbt->fbtp_patchval = FBT_PATCHVAL; 235 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 236 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 237 238 lf->fbt_nentries++; 239 240 instr++; 241 goto again; 242 }
Cache object: f78d7654b815bf2052284c9a570a7e36
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