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