| 1 | /* $NetBSD: sys_machdep.c,v 1.30 2016/09/24 21:13:44 dholland Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1998, 2007, 2009 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Charles M. Hannum, and by Andrew Doran. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.30 2016/09/24 21:13:44 dholland Exp $" ); |
| 34 | |
| 35 | #include "opt_mtrr.h" |
| 36 | #include "opt_perfctrs.h" |
| 37 | #include "opt_user_ldt.h" |
| 38 | #include "opt_compat_netbsd.h" |
| 39 | #ifdef i386 |
| 40 | #include "opt_vm86.h" |
| 41 | #endif |
| 42 | #include "opt_xen.h" |
| 43 | |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/systm.h> |
| 46 | #include <sys/ioctl.h> |
| 47 | #include <sys/file.h> |
| 48 | #include <sys/time.h> |
| 49 | #include <sys/proc.h> |
| 50 | #include <sys/uio.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/buf.h> |
| 53 | #include <sys/signal.h> |
| 54 | #include <sys/malloc.h> |
| 55 | #include <sys/kmem.h> |
| 56 | #include <sys/kauth.h> |
| 57 | #include <sys/cpu.h> |
| 58 | #include <sys/mount.h> |
| 59 | #include <sys/syscallargs.h> |
| 60 | |
| 61 | #include <uvm/uvm_extern.h> |
| 62 | |
| 63 | #include <machine/cpufunc.h> |
| 64 | #include <machine/gdt.h> |
| 65 | #include <machine/psl.h> |
| 66 | #include <machine/reg.h> |
| 67 | #include <machine/sysarch.h> |
| 68 | #include <machine/mtrr.h> |
| 69 | |
| 70 | #ifdef __x86_64__ |
| 71 | /* Need to be checked. */ |
| 72 | #undef USER_LDT |
| 73 | #undef PERFCTRS |
| 74 | #undef IOPERM |
| 75 | #else |
| 76 | #if defined(XEN) |
| 77 | #undef IOPERM |
| 78 | #else /* defined(XEN) */ |
| 79 | #define IOPERM |
| 80 | #endif /* defined(XEN) */ |
| 81 | #endif |
| 82 | |
| 83 | #ifdef VM86 |
| 84 | #include <machine/vm86.h> |
| 85 | #endif |
| 86 | |
| 87 | #ifdef PERFCTRS |
| 88 | #include <machine/pmc.h> |
| 89 | #endif |
| 90 | |
| 91 | extern struct vm_map *kernel_map; |
| 92 | |
| 93 | int x86_get_ioperm(struct lwp *, void *, register_t *); |
| 94 | int x86_set_ioperm(struct lwp *, void *, register_t *); |
| 95 | int x86_get_mtrr(struct lwp *, void *, register_t *); |
| 96 | int x86_set_mtrr(struct lwp *, void *, register_t *); |
| 97 | int x86_set_sdbase32(void *, char, lwp_t *, bool); |
| 98 | int x86_set_sdbase(void *, char, lwp_t *, bool); |
| 99 | int x86_get_sdbase32(void *, char); |
| 100 | int x86_get_sdbase(void *, char); |
| 101 | |
| 102 | #if defined(USER_LDT) && defined(LDT_DEBUG) |
| 103 | static void x86_print_ldt(int, const struct segment_descriptor *); |
| 104 | |
| 105 | static void |
| 106 | x86_print_ldt(int i, const struct segment_descriptor *d) |
| 107 | { |
| 108 | printf("[%d] lolimit=0x%x, lobase=0x%x, type=%u, dpl=%u, p=%u, " |
| 109 | "hilimit=0x%x, xx=%x, def32=%u, gran=%u, hibase=0x%x\n" , |
| 110 | i, d->sd_lolimit, d->sd_lobase, d->sd_type, d->sd_dpl, d->sd_p, |
| 111 | d->sd_hilimit, d->sd_xx, d->sd_def32, d->sd_gran, d->sd_hibase); |
| 112 | } |
| 113 | #endif |
| 114 | |
| 115 | int |
| 116 | x86_get_ldt(struct lwp *l, void *args, register_t *retval) |
| 117 | { |
| 118 | #ifndef USER_LDT |
| 119 | return EINVAL; |
| 120 | #else |
| 121 | struct x86_get_ldt_args ua; |
| 122 | union descriptor *cp; |
| 123 | int error; |
| 124 | |
| 125 | if ((error = copyin(args, &ua, sizeof(ua))) != 0) |
| 126 | return error; |
| 127 | |
| 128 | if (ua.num < 0 || ua.num > 8192) |
| 129 | return EINVAL; |
| 130 | |
| 131 | cp = malloc(ua.num * sizeof(union descriptor), M_TEMP, M_WAITOK); |
| 132 | if (cp == NULL) |
| 133 | return ENOMEM; |
| 134 | |
| 135 | error = x86_get_ldt1(l, &ua, cp); |
| 136 | *retval = ua.num; |
| 137 | if (error == 0) |
| 138 | error = copyout(cp, ua.desc, ua.num * sizeof(*cp)); |
| 139 | |
| 140 | free(cp, M_TEMP); |
| 141 | return error; |
| 142 | #endif |
| 143 | } |
| 144 | |
| 145 | int |
| 146 | x86_get_ldt1(struct lwp *l, struct x86_get_ldt_args *ua, union descriptor *cp) |
| 147 | { |
| 148 | #ifndef USER_LDT |
| 149 | return EINVAL; |
| 150 | #else |
| 151 | int error; |
| 152 | struct proc *p = l->l_proc; |
| 153 | pmap_t pmap = p->p_vmspace->vm_map.pmap; |
| 154 | int nldt, num; |
| 155 | union descriptor *lp; |
| 156 | |
| 157 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_LDT_GET, |
| 158 | NULL, NULL, NULL, NULL); |
| 159 | if (error) |
| 160 | return (error); |
| 161 | |
| 162 | #ifdef LDT_DEBUG |
| 163 | printf("x86_get_ldt: start=%d num=%d descs=%p\n" , ua->start, |
| 164 | ua->num, ua->desc); |
| 165 | #endif |
| 166 | |
| 167 | if (ua->start < 0 || ua->num < 0 || ua->start > 8192 || ua->num > 8192 || |
| 168 | ua->start + ua->num > 8192) |
| 169 | return (EINVAL); |
| 170 | |
| 171 | mutex_enter(&cpu_lock); |
| 172 | |
| 173 | if (pmap->pm_ldt != NULL) { |
| 174 | nldt = pmap->pm_ldt_len / sizeof(*lp); |
| 175 | lp = pmap->pm_ldt; |
| 176 | } else { |
| 177 | nldt = NLDT; |
| 178 | lp = ldt; |
| 179 | } |
| 180 | |
| 181 | if (ua->start > nldt) { |
| 182 | mutex_exit(&cpu_lock); |
| 183 | return (EINVAL); |
| 184 | } |
| 185 | |
| 186 | lp += ua->start; |
| 187 | num = min(ua->num, nldt - ua->start); |
| 188 | ua->num = num; |
| 189 | #ifdef LDT_DEBUG |
| 190 | { |
| 191 | int i; |
| 192 | for (i = 0; i < num; i++) |
| 193 | x86_print_ldt(i, &lp[i].sd); |
| 194 | } |
| 195 | #endif |
| 196 | |
| 197 | memcpy(cp, lp, num * sizeof(union descriptor)); |
| 198 | mutex_exit(&cpu_lock); |
| 199 | |
| 200 | return 0; |
| 201 | #endif |
| 202 | } |
| 203 | |
| 204 | int |
| 205 | x86_set_ldt(struct lwp *l, void *args, register_t *retval) |
| 206 | { |
| 207 | #ifndef USER_LDT |
| 208 | return EINVAL; |
| 209 | #else |
| 210 | struct x86_set_ldt_args ua; |
| 211 | union descriptor *descv; |
| 212 | int error; |
| 213 | |
| 214 | if ((error = copyin(args, &ua, sizeof(ua))) != 0) |
| 215 | return (error); |
| 216 | |
| 217 | if (ua.num < 0 || ua.num > 8192) |
| 218 | return EINVAL; |
| 219 | |
| 220 | descv = malloc(sizeof (*descv) * ua.num, M_TEMP, M_NOWAIT); |
| 221 | if (descv == NULL) |
| 222 | return ENOMEM; |
| 223 | |
| 224 | error = copyin(ua.desc, descv, sizeof (*descv) * ua.num); |
| 225 | if (error == 0) |
| 226 | error = x86_set_ldt1(l, &ua, descv); |
| 227 | *retval = ua.start; |
| 228 | |
| 229 | free(descv, M_TEMP); |
| 230 | return error; |
| 231 | #endif |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | x86_set_ldt1(struct lwp *l, struct x86_set_ldt_args *ua, |
| 236 | union descriptor *descv) |
| 237 | { |
| 238 | #ifndef USER_LDT |
| 239 | return EINVAL; |
| 240 | #else |
| 241 | int error, i, n, old_sel, new_sel; |
| 242 | struct proc *p = l->l_proc; |
| 243 | pmap_t pmap = p->p_vmspace->vm_map.pmap; |
| 244 | size_t old_len, new_len; |
| 245 | union descriptor *old_ldt, *new_ldt; |
| 246 | |
| 247 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_LDT_SET, |
| 248 | NULL, NULL, NULL, NULL); |
| 249 | if (error) |
| 250 | return (error); |
| 251 | |
| 252 | if (ua->start < 0 || ua->num < 0 || ua->start > 8192 || ua->num > 8192 || |
| 253 | ua->start + ua->num > 8192) |
| 254 | return (EINVAL); |
| 255 | |
| 256 | /* Check descriptors for access violations. */ |
| 257 | for (i = 0; i < ua->num; i++) { |
| 258 | union descriptor *desc = &descv[i]; |
| 259 | |
| 260 | switch (desc->sd.sd_type) { |
| 261 | case SDT_SYSNULL: |
| 262 | desc->sd.sd_p = 0; |
| 263 | break; |
| 264 | case SDT_SYS286CGT: |
| 265 | case SDT_SYS386CGT: |
| 266 | /* |
| 267 | * Only allow call gates targeting a segment |
| 268 | * in the LDT or a user segment in the fixed |
| 269 | * part of the gdt. Segments in the LDT are |
| 270 | * constrained (below) to be user segments. |
| 271 | */ |
| 272 | if (desc->gd.gd_p != 0 && |
| 273 | !ISLDT(desc->gd.gd_selector) && |
| 274 | ((IDXSEL(desc->gd.gd_selector) >= NGDT) || |
| 275 | (gdt[IDXSEL(desc->gd.gd_selector)].sd.sd_dpl != |
| 276 | SEL_UPL))) { |
| 277 | return EACCES; |
| 278 | } |
| 279 | break; |
| 280 | case SDT_MEMEC: |
| 281 | case SDT_MEMEAC: |
| 282 | case SDT_MEMERC: |
| 283 | case SDT_MEMERAC: |
| 284 | /* Must be "present" if executable and conforming. */ |
| 285 | if (desc->sd.sd_p == 0) |
| 286 | return EACCES; |
| 287 | break; |
| 288 | case SDT_MEMRO: |
| 289 | case SDT_MEMROA: |
| 290 | case SDT_MEMRW: |
| 291 | case SDT_MEMRWA: |
| 292 | case SDT_MEMROD: |
| 293 | case SDT_MEMRODA: |
| 294 | case SDT_MEMRWD: |
| 295 | case SDT_MEMRWDA: |
| 296 | case SDT_MEME: |
| 297 | case SDT_MEMEA: |
| 298 | case SDT_MEMER: |
| 299 | case SDT_MEMERA: |
| 300 | break; |
| 301 | default: |
| 302 | /* |
| 303 | * Make sure that unknown descriptor types are |
| 304 | * not marked present. |
| 305 | */ |
| 306 | if (desc->sd.sd_p != 0) |
| 307 | return EACCES; |
| 308 | break; |
| 309 | } |
| 310 | |
| 311 | if (desc->sd.sd_p != 0) { |
| 312 | /* Only user (ring-3) descriptors may be present. */ |
| 313 | if (desc->sd.sd_dpl != SEL_UPL) |
| 314 | return EACCES; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Install selected changes. We perform a copy, write, swap dance |
| 320 | * here to ensure that all updates happen atomically. |
| 321 | */ |
| 322 | |
| 323 | /* Allocate a new LDT. */ |
| 324 | for (;;) { |
| 325 | new_len = (ua->start + ua->num) * sizeof(union descriptor); |
| 326 | new_len = max(new_len, pmap->pm_ldt_len); |
| 327 | new_len = max(new_len, NLDT * sizeof(union descriptor)); |
| 328 | new_len = round_page(new_len); |
| 329 | new_ldt = (union descriptor *)uvm_km_alloc(kernel_map, |
| 330 | new_len, 0, UVM_KMF_WIRED | UVM_KMF_ZERO | UVM_KMF_WAITVA); |
| 331 | mutex_enter(&cpu_lock); |
| 332 | if (pmap->pm_ldt_len <= new_len) { |
| 333 | break; |
| 334 | } |
| 335 | mutex_exit(&cpu_lock); |
| 336 | uvm_km_free(kernel_map, (vaddr_t)new_ldt, new_len, |
| 337 | UVM_KMF_WIRED); |
| 338 | } |
| 339 | |
| 340 | /* Copy existing entries, if any. */ |
| 341 | if (pmap->pm_ldt != NULL) { |
| 342 | old_ldt = pmap->pm_ldt; |
| 343 | old_len = pmap->pm_ldt_len; |
| 344 | old_sel = pmap->pm_ldt_sel; |
| 345 | memcpy(new_ldt, old_ldt, old_len); |
| 346 | } else { |
| 347 | old_ldt = NULL; |
| 348 | old_len = 0; |
| 349 | old_sel = -1; |
| 350 | memcpy(new_ldt, ldt, NLDT * sizeof(union descriptor)); |
| 351 | } |
| 352 | |
| 353 | /* Apply requested changes. */ |
| 354 | for (i = 0, n = ua->start; i < ua->num; i++, n++) { |
| 355 | new_ldt[n] = descv[i]; |
| 356 | } |
| 357 | |
| 358 | /* Allocate LDT selector. */ |
| 359 | new_sel = ldt_alloc(new_ldt, new_len); |
| 360 | if (new_sel == -1) { |
| 361 | mutex_exit(&cpu_lock); |
| 362 | uvm_km_free(kernel_map, (vaddr_t)new_ldt, new_len, |
| 363 | UVM_KMF_WIRED); |
| 364 | return ENOMEM; |
| 365 | } |
| 366 | |
| 367 | /* All changes are now globally visible. Swap in the new LDT. */ |
| 368 | pmap->pm_ldt_len = new_len; |
| 369 | pmap->pm_ldt_sel = new_sel; |
| 370 | /* membar_store_store for pmap_fork() to read these unlocked safely */ |
| 371 | membar_producer(); |
| 372 | pmap->pm_ldt = new_ldt; |
| 373 | |
| 374 | /* Switch existing users onto new LDT. */ |
| 375 | pmap_ldt_sync(pmap); |
| 376 | |
| 377 | /* Free existing LDT (if any). */ |
| 378 | if (old_ldt != NULL) { |
| 379 | ldt_free(old_sel); |
| 380 | /* exit the mutex before free */ |
| 381 | mutex_exit(&cpu_lock); |
| 382 | uvm_km_free(kernel_map, (vaddr_t)old_ldt, old_len, |
| 383 | UVM_KMF_WIRED); |
| 384 | } else { |
| 385 | mutex_exit(&cpu_lock); |
| 386 | } |
| 387 | |
| 388 | return error; |
| 389 | #endif |
| 390 | } |
| 391 | |
| 392 | int |
| 393 | x86_iopl(struct lwp *l, void *args, register_t *retval) |
| 394 | { |
| 395 | int error; |
| 396 | struct x86_iopl_args ua; |
| 397 | #ifdef XEN |
| 398 | int iopl; |
| 399 | #else |
| 400 | struct trapframe *tf = l->l_md.md_regs; |
| 401 | #endif |
| 402 | |
| 403 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_IOPL, |
| 404 | NULL, NULL, NULL, NULL); |
| 405 | if (error) |
| 406 | return (error); |
| 407 | |
| 408 | if ((error = copyin(args, &ua, sizeof(ua))) != 0) |
| 409 | return error; |
| 410 | |
| 411 | #ifdef XEN |
| 412 | if (ua.iopl) |
| 413 | iopl = SEL_UPL; |
| 414 | else |
| 415 | iopl = SEL_KPL; |
| 416 | |
| 417 | { |
| 418 | struct physdev_op physop; |
| 419 | struct pcb *pcb; |
| 420 | |
| 421 | pcb = lwp_getpcb(l); |
| 422 | pcb->pcb_iopl = iopl; |
| 423 | |
| 424 | /* Force the change at ring 0. */ |
| 425 | physop.cmd = PHYSDEVOP_SET_IOPL; |
| 426 | physop.u.set_iopl.iopl = iopl; |
| 427 | HYPERVISOR_physdev_op(&physop); |
| 428 | } |
| 429 | #elif defined(__x86_64__) |
| 430 | if (ua.iopl) |
| 431 | tf->tf_rflags |= PSL_IOPL; |
| 432 | else |
| 433 | tf->tf_rflags &= ~PSL_IOPL; |
| 434 | #else |
| 435 | if (ua.iopl) |
| 436 | tf->tf_eflags |= PSL_IOPL; |
| 437 | else |
| 438 | tf->tf_eflags &= ~PSL_IOPL; |
| 439 | #endif |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | int |
| 445 | x86_get_ioperm(struct lwp *l, void *args, register_t *retval) |
| 446 | { |
| 447 | #ifdef IOPERM |
| 448 | int error; |
| 449 | struct pcb *pcb = lwp_getpcb(l); |
| 450 | struct x86_get_ioperm_args ua; |
| 451 | void *dummymap = NULL; |
| 452 | void *iomap; |
| 453 | |
| 454 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_IOPERM_GET, |
| 455 | NULL, NULL, NULL, NULL); |
| 456 | if (error) |
| 457 | return (error); |
| 458 | |
| 459 | if ((error = copyin(args, &ua, sizeof(ua))) != 0) |
| 460 | return (error); |
| 461 | |
| 462 | iomap = pcb->pcb_iomap; |
| 463 | if (iomap == NULL) { |
| 464 | iomap = dummymap = kmem_alloc(IOMAPSIZE, KM_SLEEP); |
| 465 | memset(dummymap, 0xff, IOMAPSIZE); |
| 466 | } |
| 467 | error = copyout(iomap, ua.iomap, IOMAPSIZE); |
| 468 | if (dummymap != NULL) { |
| 469 | kmem_free(dummymap, IOMAPSIZE); |
| 470 | } |
| 471 | return error; |
| 472 | #else |
| 473 | return EINVAL; |
| 474 | #endif |
| 475 | } |
| 476 | |
| 477 | int |
| 478 | x86_set_ioperm(struct lwp *l, void *args, register_t *retval) |
| 479 | { |
| 480 | #ifdef IOPERM |
| 481 | struct cpu_info *ci; |
| 482 | int error; |
| 483 | struct pcb *pcb = lwp_getpcb(l); |
| 484 | struct x86_set_ioperm_args ua; |
| 485 | void *new; |
| 486 | void *old; |
| 487 | |
| 488 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_IOPERM_SET, |
| 489 | NULL, NULL, NULL, NULL); |
| 490 | if (error) |
| 491 | return (error); |
| 492 | |
| 493 | if ((error = copyin(args, &ua, sizeof(ua))) != 0) |
| 494 | return (error); |
| 495 | |
| 496 | new = kmem_alloc(IOMAPSIZE, KM_SLEEP); |
| 497 | error = copyin(ua.iomap, new, IOMAPSIZE); |
| 498 | if (error) { |
| 499 | kmem_free(new, IOMAPSIZE); |
| 500 | return error; |
| 501 | } |
| 502 | old = pcb->pcb_iomap; |
| 503 | pcb->pcb_iomap = new; |
| 504 | if (old != NULL) { |
| 505 | kmem_free(old, IOMAPSIZE); |
| 506 | } |
| 507 | |
| 508 | kpreempt_disable(); |
| 509 | ci = curcpu(); |
| 510 | memcpy(ci->ci_iomap, pcb->pcb_iomap, sizeof(ci->ci_iomap)); |
| 511 | ci->ci_tss.tss_iobase = |
| 512 | ((uintptr_t)ci->ci_iomap - (uintptr_t)&ci->ci_tss) << 16; |
| 513 | kpreempt_enable(); |
| 514 | |
| 515 | return error; |
| 516 | #else |
| 517 | return EINVAL; |
| 518 | #endif |
| 519 | } |
| 520 | |
| 521 | int |
| 522 | x86_get_mtrr(struct lwp *l, void *args, register_t *retval) |
| 523 | { |
| 524 | #ifdef MTRR |
| 525 | struct x86_get_mtrr_args ua; |
| 526 | int error, n; |
| 527 | |
| 528 | if (mtrr_funcs == NULL) |
| 529 | return ENOSYS; |
| 530 | |
| 531 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_MTRR_GET, |
| 532 | NULL, NULL, NULL, NULL); |
| 533 | if (error) |
| 534 | return (error); |
| 535 | |
| 536 | error = copyin(args, &ua, sizeof ua); |
| 537 | if (error != 0) |
| 538 | return error; |
| 539 | |
| 540 | error = copyin(ua.n, &n, sizeof n); |
| 541 | if (error != 0) |
| 542 | return error; |
| 543 | |
| 544 | KERNEL_LOCK(1, NULL); |
| 545 | error = mtrr_get(ua.mtrrp, &n, l->l_proc, MTRR_GETSET_USER); |
| 546 | KERNEL_UNLOCK_ONE(NULL); |
| 547 | |
| 548 | copyout(&n, ua.n, sizeof (int)); |
| 549 | |
| 550 | return error; |
| 551 | #else |
| 552 | return EINVAL; |
| 553 | #endif |
| 554 | } |
| 555 | |
| 556 | int |
| 557 | x86_set_mtrr(struct lwp *l, void *args, register_t *retval) |
| 558 | { |
| 559 | #ifdef MTRR |
| 560 | int error, n; |
| 561 | struct x86_set_mtrr_args ua; |
| 562 | |
| 563 | if (mtrr_funcs == NULL) |
| 564 | return ENOSYS; |
| 565 | |
| 566 | error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_MTRR_SET, |
| 567 | NULL, NULL, NULL, NULL); |
| 568 | if (error) |
| 569 | return (error); |
| 570 | |
| 571 | error = copyin(args, &ua, sizeof ua); |
| 572 | if (error != 0) |
| 573 | return error; |
| 574 | |
| 575 | error = copyin(ua.n, &n, sizeof n); |
| 576 | if (error != 0) |
| 577 | return error; |
| 578 | |
| 579 | KERNEL_LOCK(1, NULL); |
| 580 | error = mtrr_set(ua.mtrrp, &n, l->l_proc, MTRR_GETSET_USER); |
| 581 | if (n != 0) |
| 582 | mtrr_commit(); |
| 583 | KERNEL_UNLOCK_ONE(NULL); |
| 584 | |
| 585 | copyout(&n, ua.n, sizeof n); |
| 586 | |
| 587 | return error; |
| 588 | #else |
| 589 | return EINVAL; |
| 590 | #endif |
| 591 | } |
| 592 | |
| 593 | #ifdef __x86_64__ |
| 594 | #define pcb_fsd pcb_fs |
| 595 | #define pcb_gsd pcb_gs |
| 596 | #define segment_descriptor mem_segment_descriptor |
| 597 | #endif |
| 598 | |
| 599 | int |
| 600 | x86_set_sdbase32(void *arg, char which, lwp_t *l, bool direct) |
| 601 | { |
| 602 | struct trapframe *tf = l->l_md.md_regs; |
| 603 | union descriptor usd; |
| 604 | struct pcb *pcb; |
| 605 | uint32_t base; |
| 606 | int error; |
| 607 | |
| 608 | if (direct) { |
| 609 | base = (vaddr_t)arg; |
| 610 | } else { |
| 611 | error = copyin(arg, &base, sizeof(base)); |
| 612 | if (error != 0) |
| 613 | return error; |
| 614 | } |
| 615 | |
| 616 | memset(&usd, 0, sizeof(usd)); |
| 617 | usd.sd.sd_lobase = base & 0xffffff; |
| 618 | usd.sd.sd_hibase = (base >> 24) & 0xff; |
| 619 | usd.sd.sd_lolimit = 0xffff; |
| 620 | usd.sd.sd_hilimit = 0xf; |
| 621 | usd.sd.sd_type = SDT_MEMRWA; |
| 622 | usd.sd.sd_dpl = SEL_UPL; |
| 623 | usd.sd.sd_p = 1; |
| 624 | usd.sd.sd_def32 = 1; |
| 625 | usd.sd.sd_gran = 1; |
| 626 | |
| 627 | pcb = lwp_getpcb(l); |
| 628 | kpreempt_disable(); |
| 629 | if (which == 'f') { |
| 630 | memcpy(&pcb->pcb_fsd, &usd.sd, |
| 631 | sizeof(struct segment_descriptor)); |
| 632 | if (l == curlwp) { |
| 633 | update_descriptor(&curcpu()->ci_gdt[GUFS_SEL], &usd); |
| 634 | #ifdef __x86_64__ |
| 635 | setfs(GSEL(GUFS_SEL, SEL_UPL)); |
| 636 | #endif |
| 637 | } |
| 638 | tf->tf_fs = GSEL(GUFS_SEL, SEL_UPL); |
| 639 | } else /* which == 'g' */ { |
| 640 | memcpy(&pcb->pcb_gsd, &usd.sd, |
| 641 | sizeof(struct segment_descriptor)); |
| 642 | if (l == curlwp) { |
| 643 | update_descriptor(&curcpu()->ci_gdt[GUGS_SEL], &usd); |
| 644 | #ifdef __x86_64__ |
| 645 | #ifndef XEN |
| 646 | setusergs(GSEL(GUGS_SEL, SEL_UPL)); |
| 647 | #else |
| 648 | HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, |
| 649 | GSEL(GUGS_SEL, SEL_UPL)); |
| 650 | #endif |
| 651 | #endif |
| 652 | } |
| 653 | tf->tf_gs = GSEL(GUGS_SEL, SEL_UPL); |
| 654 | } |
| 655 | kpreempt_enable(); |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | int |
| 660 | x86_set_sdbase(void *arg, char which, lwp_t *l, bool direct) |
| 661 | { |
| 662 | #ifdef i386 |
| 663 | return x86_set_sdbase32(arg, which, l, direct); |
| 664 | #else |
| 665 | struct pcb *pcb; |
| 666 | vaddr_t base; |
| 667 | |
| 668 | if (l->l_proc->p_flag & PK_32) { |
| 669 | return x86_set_sdbase32(arg, which, l, direct); |
| 670 | } |
| 671 | |
| 672 | if (direct) { |
| 673 | base = (vaddr_t)arg; |
| 674 | } else { |
| 675 | int error = copyin(arg, &base, sizeof(base)); |
| 676 | if (error != 0) |
| 677 | return error; |
| 678 | } |
| 679 | |
| 680 | if (base >= VM_MAXUSER_ADDRESS) |
| 681 | return EINVAL; |
| 682 | |
| 683 | pcb = lwp_getpcb(l); |
| 684 | |
| 685 | kpreempt_disable(); |
| 686 | switch(which) { |
| 687 | case 'f': |
| 688 | pcb->pcb_fs = base; |
| 689 | if (l == curlwp) |
| 690 | wrmsr(MSR_FSBASE, pcb->pcb_fs); |
| 691 | break; |
| 692 | case 'g': |
| 693 | pcb->pcb_gs = base; |
| 694 | if (l == curlwp) |
| 695 | wrmsr(MSR_KERNELGSBASE, pcb->pcb_gs); |
| 696 | break; |
| 697 | default: |
| 698 | panic("x86_set_sdbase" ); |
| 699 | } |
| 700 | kpreempt_enable(); |
| 701 | |
| 702 | return 0; |
| 703 | #endif |
| 704 | } |
| 705 | |
| 706 | int |
| 707 | x86_get_sdbase32(void *arg, char which) |
| 708 | { |
| 709 | struct segment_descriptor *sd; |
| 710 | uint32_t base; |
| 711 | |
| 712 | switch (which) { |
| 713 | case 'f': |
| 714 | sd = (void *)&curpcb->pcb_fsd; |
| 715 | break; |
| 716 | case 'g': |
| 717 | sd = (void *)&curpcb->pcb_gsd; |
| 718 | break; |
| 719 | default: |
| 720 | panic("x86_get_sdbase32" ); |
| 721 | } |
| 722 | |
| 723 | base = sd->sd_hibase << 24 | sd->sd_lobase; |
| 724 | return copyout(&base, arg, sizeof(base)); |
| 725 | } |
| 726 | |
| 727 | int |
| 728 | x86_get_sdbase(void *arg, char which) |
| 729 | { |
| 730 | #ifdef i386 |
| 731 | return x86_get_sdbase32(arg, which); |
| 732 | #else |
| 733 | vaddr_t base; |
| 734 | struct pcb *pcb; |
| 735 | |
| 736 | if (curproc->p_flag & PK_32) { |
| 737 | return x86_get_sdbase32(arg, which); |
| 738 | } |
| 739 | |
| 740 | pcb = lwp_getpcb(curlwp); |
| 741 | |
| 742 | switch(which) { |
| 743 | case 'f': |
| 744 | base = pcb->pcb_fs; |
| 745 | break; |
| 746 | case 'g': |
| 747 | base = pcb->pcb_gs; |
| 748 | break; |
| 749 | default: |
| 750 | panic("x86_get_sdbase" ); |
| 751 | } |
| 752 | |
| 753 | return copyout(&base, arg, sizeof(base)); |
| 754 | #endif |
| 755 | } |
| 756 | |
| 757 | int |
| 758 | sys_sysarch(struct lwp *l, const struct sys_sysarch_args *uap, register_t *retval) |
| 759 | { |
| 760 | /* { |
| 761 | syscallarg(int) op; |
| 762 | syscallarg(void *) parms; |
| 763 | } */ |
| 764 | int error = 0; |
| 765 | |
| 766 | switch(SCARG(uap, op)) { |
| 767 | case X86_IOPL: |
| 768 | error = x86_iopl(l, SCARG(uap, parms), retval); |
| 769 | break; |
| 770 | |
| 771 | case X86_GET_LDT: |
| 772 | error = x86_get_ldt(l, SCARG(uap, parms), retval); |
| 773 | break; |
| 774 | |
| 775 | case X86_SET_LDT: |
| 776 | error = x86_set_ldt(l, SCARG(uap, parms), retval); |
| 777 | break; |
| 778 | |
| 779 | case X86_GET_IOPERM: |
| 780 | error = x86_get_ioperm(l, SCARG(uap, parms), retval); |
| 781 | break; |
| 782 | |
| 783 | case X86_SET_IOPERM: |
| 784 | error = x86_set_ioperm(l, SCARG(uap, parms), retval); |
| 785 | break; |
| 786 | |
| 787 | case X86_GET_MTRR: |
| 788 | error = x86_get_mtrr(l, SCARG(uap, parms), retval); |
| 789 | break; |
| 790 | case X86_SET_MTRR: |
| 791 | error = x86_set_mtrr(l, SCARG(uap, parms), retval); |
| 792 | break; |
| 793 | |
| 794 | #ifdef VM86 |
| 795 | case X86_VM86: |
| 796 | error = x86_vm86(l, SCARG(uap, parms), retval); |
| 797 | break; |
| 798 | case X86_OLD_VM86: |
| 799 | error = compat_16_x86_vm86(l, SCARG(uap, parms), retval); |
| 800 | break; |
| 801 | #endif |
| 802 | |
| 803 | #ifdef PERFCTRS |
| 804 | case X86_PMC_INFO: |
| 805 | KERNEL_LOCK(1, NULL); |
| 806 | error = pmc_info(l, SCARG(uap, parms), retval); |
| 807 | KERNEL_UNLOCK_ONE(NULL); |
| 808 | break; |
| 809 | |
| 810 | case X86_PMC_STARTSTOP: |
| 811 | KERNEL_LOCK(1, NULL); |
| 812 | error = pmc_startstop(l, SCARG(uap, parms), retval); |
| 813 | KERNEL_UNLOCK_ONE(NULL); |
| 814 | break; |
| 815 | |
| 816 | case X86_PMC_READ: |
| 817 | KERNEL_LOCK(1, NULL); |
| 818 | error = pmc_read(l, SCARG(uap, parms), retval); |
| 819 | KERNEL_UNLOCK_ONE(NULL); |
| 820 | break; |
| 821 | #endif |
| 822 | |
| 823 | case X86_SET_FSBASE: |
| 824 | error = x86_set_sdbase(SCARG(uap, parms), 'f', curlwp, false); |
| 825 | break; |
| 826 | |
| 827 | case X86_SET_GSBASE: |
| 828 | error = x86_set_sdbase(SCARG(uap, parms), 'g', curlwp, false); |
| 829 | break; |
| 830 | |
| 831 | case X86_GET_FSBASE: |
| 832 | error = x86_get_sdbase(SCARG(uap, parms), 'f'); |
| 833 | break; |
| 834 | |
| 835 | case X86_GET_GSBASE: |
| 836 | error = x86_get_sdbase(SCARG(uap, parms), 'g'); |
| 837 | break; |
| 838 | |
| 839 | default: |
| 840 | error = EINVAL; |
| 841 | break; |
| 842 | } |
| 843 | return (error); |
| 844 | } |
| 845 | |
| 846 | int |
| 847 | cpu_lwp_setprivate(lwp_t *l, void *addr) |
| 848 | { |
| 849 | |
| 850 | #ifdef __x86_64__ |
| 851 | if ((l->l_proc->p_flag & PK_32) == 0) { |
| 852 | return x86_set_sdbase(addr, 'f', l, true); |
| 853 | } |
| 854 | #endif |
| 855 | return x86_set_sdbase(addr, 'g', l, true); |
| 856 | } |
| 857 | |