1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_capsicum.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/capsicum.h> 42 #include <sys/proc.h> 43 #include <sys/sysproto.h> 44 #include <sys/syscall.h> 45 #include <sys/sysent.h> 46 #include <vm/vm.h> 47 #include <vm/vm_extern.h> 48 49 #include <machine/cpu.h> 50 #include <machine/sysarch.h> 51 #include <machine/machdep.h> 52 #include <machine/vmparam.h> 53 54 #ifndef _SYS_SYSPROTO_H_ 55 struct sysarch_args { 56 int op; 57 char *parms; 58 }; 59 #endif 60 61 /* Prototypes */ 62 static int arm32_sync_icache (struct thread *, void *); 63 static int arm32_drain_writebuf(struct thread *, void *); 64 65 #if __ARM_ARCH >= 6 66 static int 67 sync_icache(uintptr_t addr, size_t len) 68 { 69 size_t size; 70 vm_offset_t rv; 71 72 /* 73 * Align starting address to even number because value of "1" 74 * is used as return value for success. 75 */ 76 len += addr & 1; 77 addr &= ~1; 78 79 /* Break whole range to pages. */ 80 do { 81 size = PAGE_SIZE - (addr & PAGE_MASK); 82 size = min(size, len); 83 rv = dcache_wb_pou_checked(addr, size); 84 if (rv == 1) /* see dcache_wb_pou_checked() */ 85 rv = icache_inv_pou_checked(addr, size); 86 if (rv != 1) { 87 if (!useracc((void *)addr, size, VM_PROT_READ)) { 88 /* Invalid access */ 89 return (rv); 90 } 91 /* Valid but unmapped page - skip it. */ 92 } 93 len -= size; 94 addr += size; 95 } while (len > 0); 96 97 /* Invalidate branch predictor buffer. */ 98 bpb_inv_all(); 99 return (1); 100 } 101 #endif 102 103 static int 104 arm32_sync_icache(struct thread *td, void *args) 105 { 106 struct arm_sync_icache_args ua; 107 int error; 108 ksiginfo_t ksi; 109 #if __ARM_ARCH >= 6 110 vm_offset_t rv; 111 #endif 112 113 if ((error = copyin(args, &ua, sizeof(ua))) != 0) 114 return (error); 115 116 if (ua.len == 0) { 117 td->td_retval[0] = 0; 118 return (0); 119 } 120 121 /* 122 * Validate arguments. Address and length are unsigned, 123 * so we can use wrapped overflow check. 124 */ 125 if (((ua.addr + ua.len) < ua.addr) || 126 ((ua.addr + ua.len) > VM_MAXUSER_ADDRESS)) { 127 ksiginfo_init_trap(&ksi); 128 ksi.ksi_signo = SIGSEGV; 129 ksi.ksi_code = SEGV_ACCERR; 130 ksi.ksi_addr = (void *)max(ua.addr, VM_MAXUSER_ADDRESS); 131 trapsignal(td, &ksi); 132 return (EINVAL); 133 } 134 135 #if __ARM_ARCH >= 6 136 rv = sync_icache(ua.addr, ua.len); 137 if (rv != 1) { 138 ksiginfo_init_trap(&ksi); 139 ksi.ksi_signo = SIGSEGV; 140 ksi.ksi_code = SEGV_MAPERR; 141 ksi.ksi_addr = (void *)rv; 142 trapsignal(td, &ksi); 143 return (EINVAL); 144 } 145 #else 146 cpu_icache_sync_range(ua.addr, ua.len); 147 #endif 148 149 td->td_retval[0] = 0; 150 return (0); 151 } 152 153 static int 154 arm32_drain_writebuf(struct thread *td, void *args) 155 { 156 /* No args. */ 157 158 #if __ARM_ARCH < 6 159 cpu_drain_writebuf(); 160 #else 161 dsb(); 162 cpu_l2cache_drain_writebuf(); 163 #endif 164 td->td_retval[0] = 0; 165 return (0); 166 } 167 168 static int 169 arm32_set_tp(struct thread *td, void *args) 170 { 171 172 #if __ARM_ARCH >= 6 173 set_tls(args); 174 #else 175 td->td_md.md_tp = (register_t)args; 176 *(register_t *)ARM_TP_ADDRESS = (register_t)args; 177 #endif 178 return (0); 179 } 180 181 static int 182 arm32_get_tp(struct thread *td, void *args) 183 { 184 185 #if __ARM_ARCH >= 6 186 td->td_retval[0] = (register_t)get_tls(); 187 #else 188 td->td_retval[0] = *(register_t *)ARM_TP_ADDRESS; 189 #endif 190 return (0); 191 } 192 193 int 194 sysarch(struct thread *td, struct sysarch_args *uap) 195 { 196 int error; 197 198 #ifdef CAPABILITY_MODE 199 /* 200 * When adding new operations, add a new case statement here to 201 * explicitly indicate whether or not the operation is safe to 202 * perform in capability mode. 203 */ 204 if (IN_CAPABILITY_MODE(td)) { 205 switch (uap->op) { 206 case ARM_SYNC_ICACHE: 207 case ARM_DRAIN_WRITEBUF: 208 case ARM_SET_TP: 209 case ARM_GET_TP: 210 case ARM_GET_VFPSTATE: 211 break; 212 213 default: 214 #ifdef KTRACE 215 if (KTRPOINT(td, KTR_CAPFAIL)) 216 ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL); 217 #endif 218 return (ECAPMODE); 219 } 220 } 221 #endif 222 223 switch (uap->op) { 224 case ARM_SYNC_ICACHE: 225 error = arm32_sync_icache(td, uap->parms); 226 break; 227 case ARM_DRAIN_WRITEBUF: 228 error = arm32_drain_writebuf(td, uap->parms); 229 break; 230 case ARM_SET_TP: 231 error = arm32_set_tp(td, uap->parms); 232 break; 233 case ARM_GET_TP: 234 error = arm32_get_tp(td, uap->parms); 235 break; 236 case ARM_GET_VFPSTATE: 237 error = arm_get_vfpstate(td, uap->parms); 238 break; 239 default: 240 error = EINVAL; 241 break; 242 } 243 return (error); 244 } 245