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 static int 66 sync_icache(uintptr_t addr, size_t len) 67 { 68 size_t size; 69 vm_offset_t rv; 70 71 /* 72 * Align starting address to even number because value of "1" 73 * is used as return value for success. 74 */ 75 len += addr & 1; 76 addr &= ~1; 77 78 /* Break whole range to pages. */ 79 do { 80 size = PAGE_SIZE - (addr & PAGE_MASK); 81 size = min(size, len); 82 rv = dcache_wb_pou_checked(addr, size); 83 if (rv == 1) /* see dcache_wb_pou_checked() */ 84 rv = icache_inv_pou_checked(addr, size); 85 if (rv != 1) { 86 if (!useracc((void *)addr, size, VM_PROT_READ)) { 87 /* Invalid access */ 88 return (rv); 89 } 90 /* Valid but unmapped page - skip it. */ 91 } 92 len -= size; 93 addr += size; 94 } while (len > 0); 95 96 /* Invalidate branch predictor buffer. */ 97 bpb_inv_all(); 98 return (1); 99 } 100 101 static int 102 arm32_sync_icache(struct thread *td, void *args) 103 { 104 struct arm_sync_icache_args ua; 105 int error; 106 ksiginfo_t ksi; 107 vm_offset_t rv; 108 109 if ((error = copyin(args, &ua, sizeof(ua))) != 0) 110 return (error); 111 112 if (ua.len == 0) { 113 td->td_retval[0] = 0; 114 return (0); 115 } 116 117 /* 118 * Validate arguments. Address and length are unsigned, 119 * so we can use wrapped overflow check. 120 */ 121 if (((ua.addr + ua.len) < ua.addr) || 122 ((ua.addr + ua.len) > VM_MAXUSER_ADDRESS)) { 123 ksiginfo_init_trap(&ksi); 124 ksi.ksi_signo = SIGSEGV; 125 ksi.ksi_code = SEGV_ACCERR; 126 ksi.ksi_addr = (void *)max(ua.addr, VM_MAXUSER_ADDRESS); 127 trapsignal(td, &ksi); 128 return (EINVAL); 129 } 130 131 rv = sync_icache(ua.addr, ua.len); 132 if (rv != 1) { 133 ksiginfo_init_trap(&ksi); 134 ksi.ksi_signo = SIGSEGV; 135 ksi.ksi_code = SEGV_MAPERR; 136 ksi.ksi_addr = (void *)rv; 137 trapsignal(td, &ksi); 138 return (EINVAL); 139 } 140 141 td->td_retval[0] = 0; 142 return (0); 143 } 144 145 static int 146 arm32_drain_writebuf(struct thread *td, void *args) 147 { 148 /* No args. */ 149 150 dsb(); 151 cpu_l2cache_drain_writebuf(); 152 td->td_retval[0] = 0; 153 return (0); 154 } 155 156 static int 157 arm32_set_tp(struct thread *td, void *args) 158 { 159 160 set_tls(args); 161 return (0); 162 } 163 164 static int 165 arm32_get_tp(struct thread *td, void *args) 166 { 167 168 td->td_retval[0] = (register_t)get_tls(); 169 return (0); 170 } 171 172 int 173 sysarch(struct thread *td, struct sysarch_args *uap) 174 { 175 int error; 176 177 #ifdef CAPABILITY_MODE 178 /* 179 * When adding new operations, add a new case statement here to 180 * explicitly indicate whether or not the operation is safe to 181 * perform in capability mode. 182 */ 183 if (IN_CAPABILITY_MODE(td)) { 184 switch (uap->op) { 185 case ARM_SYNC_ICACHE: 186 case ARM_DRAIN_WRITEBUF: 187 case ARM_SET_TP: 188 case ARM_GET_TP: 189 case ARM_GET_VFPSTATE: 190 break; 191 192 default: 193 #ifdef KTRACE 194 if (KTRPOINT(td, KTR_CAPFAIL)) 195 ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL); 196 #endif 197 return (ECAPMODE); 198 } 199 } 200 #endif 201 202 switch (uap->op) { 203 case ARM_SYNC_ICACHE: 204 error = arm32_sync_icache(td, uap->parms); 205 break; 206 case ARM_DRAIN_WRITEBUF: 207 error = arm32_drain_writebuf(td, uap->parms); 208 break; 209 case ARM_SET_TP: 210 error = arm32_set_tp(td, uap->parms); 211 break; 212 case ARM_GET_TP: 213 error = arm32_get_tp(td, uap->parms); 214 break; 215 case ARM_GET_VFPSTATE: 216 error = arm_get_vfpstate(td, uap->parms); 217 break; 218 default: 219 error = EINVAL; 220 break; 221 } 222 return (error); 223 } 224