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 32 #include <sys/cdefs.h> 33 #include "opt_capsicum.h" 34 #include "opt_ktrace.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/capsicum.h> 39 #include <sys/ktrace.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/machdep.h> 50 #include <machine/vmparam.h> 51 52 #ifndef _SYS_SYSPROTO_H_ 53 struct sysarch_args { 54 int op; 55 char *parms; 56 }; 57 #endif 58 59 /* Prototypes */ 60 static int arm32_sync_icache (struct thread *, void *); 61 static int arm32_drain_writebuf(struct thread *, void *); 62 63 static int 64 sync_icache(uintptr_t addr, size_t len) 65 { 66 size_t size; 67 vm_offset_t rv; 68 69 /* Align starting address to cacheline size */ 70 len += addr & cpuinfo.dcache_line_mask; 71 addr &= ~cpuinfo.dcache_line_mask; 72 73 /* Break whole range to pages. */ 74 do { 75 size = PAGE_SIZE - (addr & PAGE_MASK); 76 size = min(size, len); 77 rv = dcache_wb_pou_checked(addr, size); 78 if (rv == 1) /* see dcache_wb_pou_checked() */ 79 rv = icache_inv_pou_checked(addr, size); 80 if (rv != 1) { 81 if (!useracc((void *)addr, size, VM_PROT_READ)) { 82 /* Invalid access */ 83 return (rv); 84 } 85 /* Valid but unmapped page - skip it. */ 86 } 87 len -= size; 88 addr += size; 89 } while (len > 0); 90 91 /* Invalidate branch predictor buffer. */ 92 bpb_inv_all(); 93 return (1); 94 } 95 96 static int 97 arm32_sync_icache(struct thread *td, void *args) 98 { 99 struct arm_sync_icache_args ua; 100 int error; 101 ksiginfo_t ksi; 102 vm_offset_t rv; 103 104 if ((error = copyin(args, &ua, sizeof(ua))) != 0) 105 return (error); 106 107 if (ua.len == 0) { 108 td->td_retval[0] = 0; 109 return (0); 110 } 111 112 /* 113 * Validate arguments. Address and length are unsigned, 114 * so we can use wrapped overflow check. 115 */ 116 if (((ua.addr + ua.len) < ua.addr) || 117 ((ua.addr + ua.len) > VM_MAXUSER_ADDRESS)) { 118 ksiginfo_init_trap(&ksi); 119 ksi.ksi_signo = SIGSEGV; 120 ksi.ksi_code = SEGV_ACCERR; 121 ksi.ksi_addr = (void *)max(ua.addr, VM_MAXUSER_ADDRESS); 122 trapsignal(td, &ksi); 123 return (EINVAL); 124 } 125 126 rv = sync_icache(ua.addr, ua.len); 127 if (rv != 1) { 128 ksiginfo_init_trap(&ksi); 129 ksi.ksi_signo = SIGSEGV; 130 ksi.ksi_code = SEGV_MAPERR; 131 ksi.ksi_addr = (void *)rv; 132 trapsignal(td, &ksi); 133 return (EINVAL); 134 } 135 136 td->td_retval[0] = 0; 137 return (0); 138 } 139 140 static int 141 arm32_drain_writebuf(struct thread *td, void *args) 142 { 143 /* No args. */ 144 145 dsb(); 146 cpu_l2cache_drain_writebuf(); 147 td->td_retval[0] = 0; 148 return (0); 149 } 150 151 static int 152 arm32_set_tp(struct thread *td, void *args) 153 { 154 155 set_tls(args); 156 return (0); 157 } 158 159 static int 160 arm32_get_tp(struct thread *td, void *args) 161 { 162 163 td->td_retval[0] = (register_t)get_tls(); 164 return (0); 165 } 166 167 int 168 sysarch(struct thread *td, struct sysarch_args *uap) 169 { 170 int error; 171 172 #ifdef CAPABILITY_MODE 173 /* 174 * When adding new operations, add a new case statement here to 175 * explicitly indicate whether or not the operation is safe to 176 * perform in capability mode. 177 */ 178 if (IN_CAPABILITY_MODE(td)) { 179 switch (uap->op) { 180 case ARM_SYNC_ICACHE: 181 case ARM_DRAIN_WRITEBUF: 182 case ARM_SET_TP: 183 case ARM_GET_TP: 184 case ARM_GET_VFPSTATE: 185 break; 186 187 default: 188 #ifdef KTRACE 189 if (KTRPOINT(td, KTR_CAPFAIL)) 190 ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL); 191 #endif 192 return (ECAPMODE); 193 } 194 } 195 #endif 196 197 switch (uap->op) { 198 case ARM_SYNC_ICACHE: 199 error = arm32_sync_icache(td, uap->parms); 200 break; 201 case ARM_DRAIN_WRITEBUF: 202 error = arm32_drain_writebuf(td, uap->parms); 203 break; 204 case ARM_SET_TP: 205 error = arm32_set_tp(td, uap->parms); 206 break; 207 case ARM_GET_TP: 208 error = arm32_get_tp(td, uap->parms); 209 break; 210 case ARM_GET_VFPSTATE: 211 error = arm_get_vfpstate(td, uap->parms); 212 break; 213 default: 214 error = EINVAL; 215 break; 216 } 217 return (error); 218 } 219