| 1 | /* |
| 2 | * Syscall implementations for semihosting. |
| 3 | * |
| 4 | * Copyright (c) 2022 Linaro |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include "qemu/osdep.h" |
| 10 | #include "qemu/log.h" |
| 11 | #include "gdbstub/syscalls.h" |
| 12 | #include "semihosting/guestfd.h" |
| 13 | #include "semihosting/syscalls.h" |
| 14 | #include "semihosting/console.h" |
| 15 | #ifdef CONFIG_USER_ONLY |
| 16 | #include "qemu.h" |
| 17 | #else |
| 18 | #include "semihosting/uaccess.h" |
| 19 | #endif |
| 20 | |
| 21 | |
| 22 | /* |
| 23 | * Validate or compute the length of the string (including terminator). |
| 24 | */ |
| 25 | static int validate_strlen(CPUState *cs, vaddr str, uint64_t tlen) |
| 26 | { |
| 27 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 28 | char c; |
| 29 | |
| 30 | if (tlen == 0) { |
| 31 | ssize_t slen = target_strlen(str); |
| 32 | |
| 33 | if (slen < 0) { |
| 34 | return -EFAULT; |
| 35 | } |
| 36 | if (slen >= INT32_MAX) { |
| 37 | return -ENAMETOOLONG; |
| 38 | } |
| 39 | return slen + 1; |
| 40 | } |
| 41 | if (tlen > INT32_MAX) { |
| 42 | return -ENAMETOOLONG; |
| 43 | } |
| 44 | if (get_user_u8(c, str + tlen - 1)) { |
| 45 | return -EFAULT; |
| 46 | } |
| 47 | if (c != 0) { |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | return tlen; |
| 51 | } |
| 52 | |
| 53 | static int validate_lock_user_string(char **pstr, CPUState *cs, |
| 54 | vaddr tstr, uint64_t tlen) |
| 55 | { |
| 56 | int ret = validate_strlen(cs, tstr, tlen); |
| 57 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 58 | char *str = NULL; |
| 59 | |
| 60 | if (ret > 0) { |
| 61 | str = lock_user(VERIFY_READ, tstr, ret, true); |
| 62 | ret = str ? 0 : -EFAULT; |
| 63 | } |
| 64 | *pstr = str; |
| 65 | return ret; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * TODO: Note that gdb always stores the stat structure big-endian. |
| 70 | * So far, that's ok, as the only two targets using this are also |
| 71 | * big-endian. Until we do something with gdb, also produce the |
| 72 | * same big-endian result from the host. |
| 73 | */ |
| 74 | static int copy_stat_to_user(CPUState *cs, vaddr addr, |
| 75 | const struct stat *s) |
| 76 | { |
| 77 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 78 | struct gdb_stat *p; |
| 79 | |
| 80 | if (s->st_dev != (uint32_t)s->st_dev || |
| 81 | s->st_ino != (uint32_t)s->st_ino) { |
| 82 | return -EOVERFLOW; |
| 83 | } |
| 84 | |
| 85 | p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0); |
| 86 | if (!p) { |
| 87 | return -EFAULT; |
| 88 | } |
| 89 | |
| 90 | p->gdb_st_dev = cpu_to_be32(s->st_dev); |
| 91 | p->gdb_st_ino = cpu_to_be32(s->st_ino); |
| 92 | p->gdb_st_mode = cpu_to_be32(s->st_mode); |
| 93 | p->gdb_st_nlink = cpu_to_be32(s->st_nlink); |
| 94 | p->gdb_st_uid = cpu_to_be32(s->st_uid); |
| 95 | p->gdb_st_gid = cpu_to_be32(s->st_gid); |
| 96 | p->gdb_st_rdev = cpu_to_be32(s->st_rdev); |
| 97 | p->gdb_st_size = cpu_to_be64(s->st_size); |
| 98 | #ifdef _WIN32 |
| 99 | /* Windows stat is missing some fields. */ |
| 100 | p->gdb_st_blksize = 0; |
| 101 | p->gdb_st_blocks = 0; |
| 102 | #else |
| 103 | p->gdb_st_blksize = cpu_to_be64(s->st_blksize); |
| 104 | p->gdb_st_blocks = cpu_to_be64(s->st_blocks); |
| 105 | #endif |
| 106 | p->gdb_st_atime = cpu_to_be32(s->st_atime); |
| 107 | p->gdb_st_mtime = cpu_to_be32(s->st_mtime); |
| 108 | p->gdb_st_ctime = cpu_to_be32(s->st_ctime); |
| 109 | |
| 110 | unlock_user(p, addr, sizeof(struct gdb_stat)); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * GDB semihosting syscall implementations. |
| 116 | */ |
| 117 | |
| 118 | static gdb_syscall_complete_cb gdb_open_complete; |
| 119 | |
| 120 | static void gdb_open_cb(CPUState *cs, uint64_t ret, int err) |
| 121 | { |
| 122 | if (!err) { |
| 123 | int guestfd = alloc_guestfd(); |
| 124 | associate_guestfd(guestfd, ret); |
| 125 | ret = guestfd; |
| 126 | } |
| 127 | gdb_open_complete(cs, ret, err); |
| 128 | } |
| 129 | |
| 130 | static void gdb_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| 131 | vaddr fname, uint64_t fname_len, |
| 132 | int gdb_flags, int mode) |
| 133 | { |
| 134 | int len = validate_strlen(cs, fname, fname_len); |
| 135 | if (len < 0) { |
| 136 | complete(cs, -1, -len); |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | gdb_open_complete = complete; |
| 141 | gdb_do_syscall(gdb_open_cb, "open,%s,%x,%x", |
| 142 | (vaddr)fname, (uint32_t)len, |
| 143 | (uint32_t)gdb_flags, (uint32_t)mode); |
| 144 | } |
| 145 | |
| 146 | static void gdb_close(CPUState *cs, gdb_syscall_complete_cb complete, |
| 147 | GuestFD *gf) |
| 148 | { |
| 149 | gdb_do_syscall(complete, "close,%x", (uint32_t)gf->hostfd); |
| 150 | } |
| 151 | |
| 152 | static void gdb_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| 153 | GuestFD *gf, vaddr buf, uint64_t len) |
| 154 | { |
| 155 | gdb_do_syscall(complete, "read,%x,%lx,%lx", |
| 156 | (uint32_t)gf->hostfd, (vaddr)buf, (uint64_t)len); |
| 157 | } |
| 158 | |
| 159 | static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| 160 | GuestFD *gf, vaddr buf, uint64_t len) |
| 161 | { |
| 162 | gdb_do_syscall(complete, "write,%x,%lx,%lx", |
| 163 | (uint32_t)gf->hostfd, (vaddr)buf, (uint64_t)len); |
| 164 | } |
| 165 | |
| 166 | static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| 167 | GuestFD *gf, int64_t off, int gdb_whence) |
| 168 | { |
| 169 | gdb_do_syscall(complete, "lseek,%x,%lx,%x", |
| 170 | (uint32_t)gf->hostfd, off, (uint32_t)gdb_whence); |
| 171 | } |
| 172 | |
| 173 | static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete, |
| 174 | GuestFD *gf) |
| 175 | { |
| 176 | gdb_do_syscall(complete, "isatty,%x", (uint32_t)gf->hostfd); |
| 177 | } |
| 178 | |
| 179 | static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 180 | GuestFD *gf, vaddr addr) |
| 181 | { |
| 182 | gdb_do_syscall(complete, "fstat,%x,%lx", |
| 183 | (uint32_t)gf->hostfd, (vaddr)addr); |
| 184 | } |
| 185 | |
| 186 | static void gdb_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 187 | vaddr fname, uint64_t fname_len, |
| 188 | vaddr addr) |
| 189 | { |
| 190 | int len = validate_strlen(cs, fname, fname_len); |
| 191 | if (len < 0) { |
| 192 | complete(cs, -1, -len); |
| 193 | return; |
| 194 | } |
| 195 | |
| 196 | gdb_do_syscall(complete, "stat,%s,%lx", |
| 197 | (vaddr)fname, (uint32_t)len, (vaddr)addr); |
| 198 | } |
| 199 | |
| 200 | static void gdb_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| 201 | vaddr fname, uint64_t fname_len) |
| 202 | { |
| 203 | int len = validate_strlen(cs, fname, fname_len); |
| 204 | if (len < 0) { |
| 205 | complete(cs, -1, -len); |
| 206 | return; |
| 207 | } |
| 208 | |
| 209 | gdb_do_syscall(complete, "unlink,%s", (vaddr)fname, (uint32_t)len); |
| 210 | } |
| 211 | |
| 212 | static void gdb_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| 213 | vaddr oname, uint64_t oname_len, |
| 214 | vaddr nname, uint64_t nname_len) |
| 215 | { |
| 216 | int olen, nlen; |
| 217 | |
| 218 | olen = validate_strlen(cs, oname, oname_len); |
| 219 | if (olen < 0) { |
| 220 | complete(cs, -1, -olen); |
| 221 | return; |
| 222 | } |
| 223 | nlen = validate_strlen(cs, nname, nname_len); |
| 224 | if (nlen < 0) { |
| 225 | complete(cs, -1, -nlen); |
| 226 | return; |
| 227 | } |
| 228 | |
| 229 | gdb_do_syscall(complete, "rename,%s,%s", |
| 230 | (vaddr)oname, (uint32_t)olen, |
| 231 | (vaddr)nname, (uint32_t)nlen); |
| 232 | } |
| 233 | |
| 234 | static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| 235 | vaddr cmd, uint64_t cmd_len) |
| 236 | { |
| 237 | int len = validate_strlen(cs, cmd, cmd_len); |
| 238 | if (len < 0) { |
| 239 | complete(cs, -1, -len); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | gdb_do_syscall(complete, "system,%s", (vaddr)cmd, (uint32_t)len); |
| 244 | } |
| 245 | |
| 246 | static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| 247 | vaddr tv_addr, vaddr tz_addr) |
| 248 | { |
| 249 | gdb_do_syscall(complete, "gettimeofday,%lx,%lx", |
| 250 | (vaddr)tv_addr, (vaddr)tz_addr); |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Host semihosting syscall implementations. |
| 255 | */ |
| 256 | |
| 257 | static void host_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| 258 | vaddr fname, uint64_t fname_len, |
| 259 | int gdb_flags, int mode) |
| 260 | { |
| 261 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 262 | char *p; |
| 263 | int ret, host_flags = O_BINARY; |
| 264 | |
| 265 | ret = validate_lock_user_string(&p, cs, fname, fname_len); |
| 266 | if (ret < 0) { |
| 267 | complete(cs, -1, -ret); |
| 268 | return; |
| 269 | } |
| 270 | |
| 271 | if (gdb_flags & GDB_O_WRONLY) { |
| 272 | host_flags |= O_WRONLY; |
| 273 | } else if (gdb_flags & GDB_O_RDWR) { |
| 274 | host_flags |= O_RDWR; |
| 275 | } else { |
| 276 | host_flags |= O_RDONLY; |
| 277 | } |
| 278 | if (gdb_flags & GDB_O_CREAT) { |
| 279 | host_flags |= O_CREAT; |
| 280 | } |
| 281 | if (gdb_flags & GDB_O_TRUNC) { |
| 282 | host_flags |= O_TRUNC; |
| 283 | } |
| 284 | if (gdb_flags & GDB_O_EXCL) { |
| 285 | host_flags |= O_EXCL; |
| 286 | } |
| 287 | |
| 288 | ret = open(p, host_flags, mode); |
| 289 | if (ret < 0) { |
| 290 | qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to open %s\n", __func__, p); |
| 291 | complete(cs, -1, errno); |
| 292 | } else { |
| 293 | int guestfd = alloc_guestfd(); |
| 294 | associate_guestfd(guestfd, ret); |
| 295 | complete(cs, guestfd, 0); |
| 296 | } |
| 297 | unlock_user(p, fname, 0); |
| 298 | } |
| 299 | |
| 300 | static void host_close(CPUState *cs, gdb_syscall_complete_cb complete, |
| 301 | GuestFD *gf) |
| 302 | { |
| 303 | /* |
| 304 | * Only close the underlying host fd if it's one we opened on behalf |
| 305 | * of the guest in SYS_OPEN. |
| 306 | */ |
| 307 | if (gf->hostfd != STDIN_FILENO && |
| 308 | gf->hostfd != STDOUT_FILENO && |
| 309 | gf->hostfd != STDERR_FILENO && |
| 310 | close(gf->hostfd) < 0) { |
| 311 | complete(cs, -1, errno); |
| 312 | } else { |
| 313 | complete(cs, 0, 0); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | static void host_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| 318 | GuestFD *gf, vaddr buf, uint64_t len) |
| 319 | { |
| 320 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 321 | void *ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| 322 | ssize_t ret; |
| 323 | |
| 324 | if (!ptr) { |
| 325 | complete(cs, -1, EFAULT); |
| 326 | return; |
| 327 | } |
| 328 | ret = RETRY_ON_EINTR(read(gf->hostfd, ptr, len)); |
| 329 | if (ret == -1) { |
| 330 | unlock_user(ptr, buf, 0); |
| 331 | complete(cs, -1, errno); |
| 332 | } else { |
| 333 | unlock_user(ptr, buf, ret); |
| 334 | complete(cs, ret, 0); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | static void host_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| 339 | GuestFD *gf, vaddr buf, uint64_t len) |
| 340 | { |
| 341 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 342 | void *ptr = lock_user(VERIFY_READ, buf, len, 1); |
| 343 | ssize_t ret; |
| 344 | |
| 345 | if (!ptr) { |
| 346 | complete(cs, -1, EFAULT); |
| 347 | return; |
| 348 | } |
| 349 | ret = write(gf->hostfd, ptr, len); |
| 350 | unlock_user(ptr, buf, 0); |
| 351 | complete(cs, ret, ret == -1 ? errno : 0); |
| 352 | } |
| 353 | |
| 354 | static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| 355 | GuestFD *gf, int64_t off, int whence) |
| 356 | { |
| 357 | /* So far, all hosts use the same values. */ |
| 358 | QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET); |
| 359 | QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR); |
| 360 | QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END); |
| 361 | |
| 362 | off_t ret = off; |
| 363 | int err = 0; |
| 364 | |
| 365 | if (ret == off) { |
| 366 | ret = lseek(gf->hostfd, ret, whence); |
| 367 | if (ret == -1) { |
| 368 | err = errno; |
| 369 | } |
| 370 | } else { |
| 371 | ret = -1; |
| 372 | err = EINVAL; |
| 373 | } |
| 374 | complete(cs, ret, err); |
| 375 | } |
| 376 | |
| 377 | static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete, |
| 378 | GuestFD *gf) |
| 379 | { |
| 380 | int ret = isatty(gf->hostfd); |
| 381 | complete(cs, ret, ret ? 0 : errno); |
| 382 | } |
| 383 | |
| 384 | static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete, |
| 385 | GuestFD *gf) |
| 386 | { |
| 387 | struct stat buf; |
| 388 | |
| 389 | if (fstat(gf->hostfd, &buf) < 0) { |
| 390 | complete(cs, -1, errno); |
| 391 | } else { |
| 392 | complete(cs, buf.st_size, 0); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | static void host_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 397 | GuestFD *gf, vaddr addr) |
| 398 | { |
| 399 | struct stat buf; |
| 400 | int ret; |
| 401 | |
| 402 | ret = fstat(gf->hostfd, &buf); |
| 403 | if (ret) { |
| 404 | complete(cs, -1, errno); |
| 405 | return; |
| 406 | } |
| 407 | ret = copy_stat_to_user(cs, addr, &buf); |
| 408 | complete(cs, ret ? -1 : 0, ret ? -ret : 0); |
| 409 | } |
| 410 | |
| 411 | static void host_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 412 | vaddr fname, uint64_t fname_len, |
| 413 | vaddr addr) |
| 414 | { |
| 415 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 416 | struct stat buf; |
| 417 | char *name; |
| 418 | int ret, err; |
| 419 | |
| 420 | ret = validate_lock_user_string(&name, cs, fname, fname_len); |
| 421 | if (ret < 0) { |
| 422 | complete(cs, -1, -ret); |
| 423 | return; |
| 424 | } |
| 425 | |
| 426 | ret = stat(name, &buf); |
| 427 | if (ret) { |
| 428 | err = errno; |
| 429 | } else { |
| 430 | ret = copy_stat_to_user(cs, addr, &buf); |
| 431 | err = 0; |
| 432 | if (ret < 0) { |
| 433 | err = -ret; |
| 434 | ret = -1; |
| 435 | } |
| 436 | } |
| 437 | unlock_user(name, fname, 0); |
| 438 | complete(cs, ret, err); |
| 439 | } |
| 440 | |
| 441 | static void host_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| 442 | vaddr fname, uint64_t fname_len) |
| 443 | { |
| 444 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 445 | char *p; |
| 446 | int ret; |
| 447 | |
| 448 | ret = validate_lock_user_string(&p, cs, fname, fname_len); |
| 449 | if (ret < 0) { |
| 450 | complete(cs, -1, -ret); |
| 451 | return; |
| 452 | } |
| 453 | |
| 454 | ret = remove(p); |
| 455 | unlock_user(p, fname, 0); |
| 456 | complete(cs, ret, ret ? errno : 0); |
| 457 | } |
| 458 | |
| 459 | static void host_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| 460 | vaddr oname, uint64_t oname_len, |
| 461 | vaddr nname, uint64_t nname_len) |
| 462 | { |
| 463 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 464 | char *ostr, *nstr; |
| 465 | int ret; |
| 466 | |
| 467 | ret = validate_lock_user_string(&ostr, cs, oname, oname_len); |
| 468 | if (ret < 0) { |
| 469 | complete(cs, -1, -ret); |
| 470 | return; |
| 471 | } |
| 472 | ret = validate_lock_user_string(&nstr, cs, nname, nname_len); |
| 473 | if (ret < 0) { |
| 474 | unlock_user(ostr, oname, 0); |
| 475 | complete(cs, -1, -ret); |
| 476 | return; |
| 477 | } |
| 478 | |
| 479 | ret = rename(ostr, nstr); |
| 480 | unlock_user(ostr, oname, 0); |
| 481 | unlock_user(nstr, nname, 0); |
| 482 | complete(cs, ret, ret ? errno : 0); |
| 483 | } |
| 484 | |
| 485 | static void host_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| 486 | vaddr cmd, uint64_t cmd_len) |
| 487 | { |
| 488 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 489 | char *p; |
| 490 | int ret; |
| 491 | |
| 492 | ret = validate_lock_user_string(&p, cs, cmd, cmd_len); |
| 493 | if (ret < 0) { |
| 494 | complete(cs, -1, -ret); |
| 495 | return; |
| 496 | } |
| 497 | |
| 498 | ret = system(p); |
| 499 | unlock_user(p, cmd, 0); |
| 500 | complete(cs, ret, ret == -1 ? errno : 0); |
| 501 | } |
| 502 | |
| 503 | static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| 504 | vaddr tv_addr, vaddr tz_addr) |
| 505 | { |
| 506 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 507 | struct gdb_timeval *p; |
| 508 | int64_t rt; |
| 509 | |
| 510 | /* GDB fails on non-null TZ, so be consistent. */ |
| 511 | if (tz_addr != 0) { |
| 512 | complete(cs, -1, EINVAL); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0); |
| 517 | if (!p) { |
| 518 | complete(cs, -1, EFAULT); |
| 519 | return; |
| 520 | } |
| 521 | |
| 522 | /* TODO: Like stat, gdb always produces big-endian results; match it. */ |
| 523 | rt = g_get_real_time(); |
| 524 | p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC); |
| 525 | p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC); |
| 526 | unlock_user(p, tv_addr, sizeof(struct gdb_timeval)); |
| 527 | } |
| 528 | |
| 529 | #ifndef CONFIG_USER_ONLY |
| 530 | static void host_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| 531 | GuestFD *gf, GIOCondition cond, int timeout) |
| 532 | { |
| 533 | /* |
| 534 | * Since this is only used by xtensa in system mode, and stdio is |
| 535 | * handled through GuestFDConsole, and there are no semihosting |
| 536 | * system calls for sockets and the like, that means this descriptor |
| 537 | * must be a normal file. Normal files never block and are thus |
| 538 | * always ready. |
| 539 | */ |
| 540 | complete(cs, cond & (G_IO_IN | G_IO_OUT), 0); |
| 541 | } |
| 542 | #endif |
| 543 | |
| 544 | /* |
| 545 | * Static file semihosting syscall implementations. |
| 546 | */ |
| 547 | |
| 548 | static void staticfile_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| 549 | GuestFD *gf, vaddr buf, uint64_t len) |
| 550 | { |
| 551 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 552 | uint64_t rest = gf->staticfile.len - gf->staticfile.off; |
| 553 | void *ptr; |
| 554 | |
| 555 | if (len > rest) { |
| 556 | len = rest; |
| 557 | } |
| 558 | ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| 559 | if (!ptr) { |
| 560 | complete(cs, -1, EFAULT); |
| 561 | return; |
| 562 | } |
| 563 | memcpy(ptr, gf->staticfile.data + gf->staticfile.off, len); |
| 564 | gf->staticfile.off += len; |
| 565 | unlock_user(ptr, buf, len); |
| 566 | complete(cs, len, 0); |
| 567 | } |
| 568 | |
| 569 | static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| 570 | GuestFD *gf, int64_t off, int gdb_whence) |
| 571 | { |
| 572 | int64_t ret; |
| 573 | |
| 574 | switch (gdb_whence) { |
| 575 | case GDB_SEEK_SET: |
| 576 | ret = off; |
| 577 | break; |
| 578 | case GDB_SEEK_CUR: |
| 579 | ret = gf->staticfile.off + off; |
| 580 | break; |
| 581 | case GDB_SEEK_END: |
| 582 | ret = gf->staticfile.len + off; |
| 583 | break; |
| 584 | default: |
| 585 | ret = -1; |
| 586 | break; |
| 587 | } |
| 588 | if (ret >= 0 && ret <= gf->staticfile.len) { |
| 589 | gf->staticfile.off = ret; |
| 590 | complete(cs, ret, 0); |
| 591 | } else { |
| 592 | complete(cs, -1, EINVAL); |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | static void staticfile_flen(CPUState *cs, gdb_syscall_complete_cb complete, |
| 597 | GuestFD *gf) |
| 598 | { |
| 599 | complete(cs, gf->staticfile.len, 0); |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Console semihosting syscall implementations. |
| 604 | */ |
| 605 | |
| 606 | static void console_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| 607 | GuestFD *gf, vaddr buf, uint64_t len) |
| 608 | { |
| 609 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 610 | char *ptr; |
| 611 | int ret; |
| 612 | |
| 613 | ptr = lock_user(VERIFY_WRITE, buf, len, 0); |
| 614 | if (!ptr) { |
| 615 | complete(cs, -1, EFAULT); |
| 616 | return; |
| 617 | } |
| 618 | ret = qemu_semihosting_console_read(cs, ptr, len); |
| 619 | unlock_user(ptr, buf, ret); |
| 620 | complete(cs, ret, 0); |
| 621 | } |
| 622 | |
| 623 | static void console_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| 624 | GuestFD *gf, vaddr buf, uint64_t len) |
| 625 | { |
| 626 | CPUArchState *env G_GNUC_UNUSED = cpu_env(cs); |
| 627 | char *ptr = lock_user(VERIFY_READ, buf, len, 1); |
| 628 | int ret; |
| 629 | |
| 630 | if (!ptr) { |
| 631 | complete(cs, -1, EFAULT); |
| 632 | return; |
| 633 | } |
| 634 | ret = qemu_semihosting_console_write(ptr, len); |
| 635 | unlock_user(ptr, buf, 0); |
| 636 | complete(cs, ret ? ret : -1, ret ? 0 : EIO); |
| 637 | } |
| 638 | |
| 639 | static void console_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 640 | GuestFD *gf, vaddr addr) |
| 641 | { |
| 642 | static const struct stat tty_buf = { |
| 643 | .st_mode = 020666, /* S_IFCHR, ugo+rw */ |
| 644 | .st_rdev = 5, /* makedev(5, 0) -- linux /dev/tty */ |
| 645 | }; |
| 646 | int ret; |
| 647 | |
| 648 | ret = copy_stat_to_user(cs, addr, &tty_buf); |
| 649 | complete(cs, ret ? -1 : 0, ret ? -ret : 0); |
| 650 | } |
| 651 | |
| 652 | #ifndef CONFIG_USER_ONLY |
| 653 | static void console_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| 654 | GuestFD *gf, GIOCondition cond, int timeout) |
| 655 | { |
| 656 | /* The semihosting console does not support urgent data or errors. */ |
| 657 | cond &= G_IO_IN | G_IO_OUT; |
| 658 | |
| 659 | /* |
| 660 | * Since qemu_semihosting_console_write never blocks, we can |
| 661 | * consider output always ready -- leave G_IO_OUT alone. |
| 662 | * All that remains is to conditionally signal input ready. |
| 663 | * Since output ready causes an immediate return, only block |
| 664 | * for G_IO_IN alone. |
| 665 | * |
| 666 | * TODO: Implement proper timeout. For now, only support |
| 667 | * indefinite wait or immediate poll. |
| 668 | */ |
| 669 | if (cond == G_IO_IN && timeout < 0) { |
| 670 | qemu_semihosting_console_block_until_ready(cs); |
| 671 | /* We returned -- input must be ready. */ |
| 672 | } else if ((cond & G_IO_IN) && !qemu_semihosting_console_ready()) { |
| 673 | cond &= ~G_IO_IN; |
| 674 | } |
| 675 | |
| 676 | complete(cs, cond, 0); |
| 677 | } |
| 678 | #endif |
| 679 | |
| 680 | /* |
| 681 | * Syscall entry points. |
| 682 | */ |
| 683 | |
| 684 | void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete, |
| 685 | vaddr fname, uint64_t fname_len, |
| 686 | int gdb_flags, int mode) |
| 687 | { |
| 688 | if (use_gdb_syscalls()) { |
| 689 | gdb_open(cs, complete, fname, fname_len, gdb_flags, mode); |
| 690 | } else { |
| 691 | host_open(cs, complete, fname, fname_len, gdb_flags, mode); |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd) |
| 696 | { |
| 697 | GuestFD *gf = get_guestfd(fd); |
| 698 | |
| 699 | if (!gf) { |
| 700 | complete(cs, -1, EBADF); |
| 701 | return; |
| 702 | } |
| 703 | switch (gf->type) { |
| 704 | case GuestFDGDB: |
| 705 | gdb_close(cs, complete, gf); |
| 706 | break; |
| 707 | case GuestFDHost: |
| 708 | host_close(cs, complete, gf); |
| 709 | break; |
| 710 | case GuestFDStatic: |
| 711 | case GuestFDConsole: |
| 712 | complete(cs, 0, 0); |
| 713 | break; |
| 714 | default: |
| 715 | g_assert_not_reached(); |
| 716 | } |
| 717 | dealloc_guestfd(fd); |
| 718 | } |
| 719 | |
| 720 | void semihost_sys_read_gf(CPUState *cs, gdb_syscall_complete_cb complete, |
| 721 | GuestFD *gf, vaddr buf, uint64_t len) |
| 722 | { |
| 723 | /* |
| 724 | * Bound length for 64-bit guests on 32-bit hosts, not overflowing ssize_t. |
| 725 | * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad |
| 726 | * idea to do this unconditionally. |
| 727 | */ |
| 728 | if (len > INT32_MAX) { |
| 729 | len = INT32_MAX; |
| 730 | } |
| 731 | switch (gf->type) { |
| 732 | case GuestFDGDB: |
| 733 | gdb_read(cs, complete, gf, buf, len); |
| 734 | break; |
| 735 | case GuestFDHost: |
| 736 | host_read(cs, complete, gf, buf, len); |
| 737 | break; |
| 738 | case GuestFDStatic: |
| 739 | staticfile_read(cs, complete, gf, buf, len); |
| 740 | break; |
| 741 | case GuestFDConsole: |
| 742 | console_read(cs, complete, gf, buf, len); |
| 743 | break; |
| 744 | default: |
| 745 | g_assert_not_reached(); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete, |
| 750 | int fd, vaddr buf, uint64_t len) |
| 751 | { |
| 752 | GuestFD *gf = get_guestfd(fd); |
| 753 | |
| 754 | if (gf) { |
| 755 | semihost_sys_read_gf(cs, complete, gf, buf, len); |
| 756 | } else { |
| 757 | complete(cs, -1, EBADF); |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | void semihost_sys_write_gf(CPUState *cs, gdb_syscall_complete_cb complete, |
| 762 | GuestFD *gf, vaddr buf, uint64_t len) |
| 763 | { |
| 764 | /* |
| 765 | * Bound length for 64-bit guests on 32-bit hosts, not overflowing ssize_t. |
| 766 | * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad |
| 767 | * idea to do this unconditionally. |
| 768 | */ |
| 769 | if (len > INT32_MAX) { |
| 770 | len = INT32_MAX; |
| 771 | } |
| 772 | switch (gf->type) { |
| 773 | case GuestFDGDB: |
| 774 | gdb_write(cs, complete, gf, buf, len); |
| 775 | break; |
| 776 | case GuestFDHost: |
| 777 | host_write(cs, complete, gf, buf, len); |
| 778 | break; |
| 779 | case GuestFDConsole: |
| 780 | console_write(cs, complete, gf, buf, len); |
| 781 | break; |
| 782 | case GuestFDStatic: |
| 783 | /* Static files are never open for writing: EBADF. */ |
| 784 | complete(cs, -1, EBADF); |
| 785 | break; |
| 786 | default: |
| 787 | g_assert_not_reached(); |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete, |
| 792 | int fd, vaddr buf, uint64_t len) |
| 793 | { |
| 794 | GuestFD *gf = get_guestfd(fd); |
| 795 | |
| 796 | if (gf) { |
| 797 | semihost_sys_write_gf(cs, complete, gf, buf, len); |
| 798 | } else { |
| 799 | complete(cs, -1, EBADF); |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete, |
| 804 | int fd, int64_t off, int gdb_whence) |
| 805 | { |
| 806 | GuestFD *gf = get_guestfd(fd); |
| 807 | |
| 808 | if (!gf) { |
| 809 | complete(cs, -1, EBADF); |
| 810 | return; |
| 811 | } |
| 812 | switch (gf->type) { |
| 813 | case GuestFDGDB: |
| 814 | gdb_lseek(cs, complete, gf, off, gdb_whence); |
| 815 | return; |
| 816 | case GuestFDHost: |
| 817 | host_lseek(cs, complete, gf, off, gdb_whence); |
| 818 | break; |
| 819 | case GuestFDStatic: |
| 820 | staticfile_lseek(cs, complete, gf, off, gdb_whence); |
| 821 | break; |
| 822 | case GuestFDConsole: |
| 823 | complete(cs, -1, ESPIPE); |
| 824 | break; |
| 825 | default: |
| 826 | g_assert_not_reached(); |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd) |
| 831 | { |
| 832 | GuestFD *gf = get_guestfd(fd); |
| 833 | |
| 834 | if (!gf) { |
| 835 | complete(cs, 0, EBADF); |
| 836 | return; |
| 837 | } |
| 838 | switch (gf->type) { |
| 839 | case GuestFDGDB: |
| 840 | gdb_isatty(cs, complete, gf); |
| 841 | break; |
| 842 | case GuestFDHost: |
| 843 | host_isatty(cs, complete, gf); |
| 844 | break; |
| 845 | case GuestFDStatic: |
| 846 | complete(cs, 0, ENOTTY); |
| 847 | break; |
| 848 | case GuestFDConsole: |
| 849 | complete(cs, 1, 0); |
| 850 | break; |
| 851 | default: |
| 852 | g_assert_not_reached(); |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb, |
| 857 | gdb_syscall_complete_cb flen_cb, int fd, |
| 858 | vaddr fstat_addr) |
| 859 | { |
| 860 | GuestFD *gf = get_guestfd(fd); |
| 861 | |
| 862 | if (!gf) { |
| 863 | flen_cb(cs, -1, EBADF); |
| 864 | return; |
| 865 | } |
| 866 | switch (gf->type) { |
| 867 | case GuestFDGDB: |
| 868 | gdb_fstat(cs, fstat_cb, gf, fstat_addr); |
| 869 | break; |
| 870 | case GuestFDHost: |
| 871 | host_flen(cs, flen_cb, gf); |
| 872 | break; |
| 873 | case GuestFDStatic: |
| 874 | staticfile_flen(cs, flen_cb, gf); |
| 875 | break; |
| 876 | case GuestFDConsole: |
| 877 | default: |
| 878 | g_assert_not_reached(); |
| 879 | } |
| 880 | } |
| 881 | |
| 882 | void semihost_sys_fstat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 883 | int fd, vaddr addr) |
| 884 | { |
| 885 | GuestFD *gf = get_guestfd(fd); |
| 886 | |
| 887 | if (!gf) { |
| 888 | complete(cs, -1, EBADF); |
| 889 | return; |
| 890 | } |
| 891 | switch (gf->type) { |
| 892 | case GuestFDGDB: |
| 893 | gdb_fstat(cs, complete, gf, addr); |
| 894 | break; |
| 895 | case GuestFDHost: |
| 896 | host_fstat(cs, complete, gf, addr); |
| 897 | break; |
| 898 | case GuestFDConsole: |
| 899 | console_fstat(cs, complete, gf, addr); |
| 900 | break; |
| 901 | case GuestFDStatic: |
| 902 | default: |
| 903 | g_assert_not_reached(); |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete, |
| 908 | vaddr fname, uint64_t fname_len, |
| 909 | vaddr addr) |
| 910 | { |
| 911 | if (use_gdb_syscalls()) { |
| 912 | gdb_stat(cs, complete, fname, fname_len, addr); |
| 913 | } else { |
| 914 | host_stat(cs, complete, fname, fname_len, addr); |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete, |
| 919 | vaddr fname, uint64_t fname_len) |
| 920 | { |
| 921 | if (use_gdb_syscalls()) { |
| 922 | gdb_remove(cs, complete, fname, fname_len); |
| 923 | } else { |
| 924 | host_remove(cs, complete, fname, fname_len); |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete, |
| 929 | vaddr oname, uint64_t oname_len, |
| 930 | vaddr nname, uint64_t nname_len) |
| 931 | { |
| 932 | if (use_gdb_syscalls()) { |
| 933 | gdb_rename(cs, complete, oname, oname_len, nname, nname_len); |
| 934 | } else { |
| 935 | host_rename(cs, complete, oname, oname_len, nname, nname_len); |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete, |
| 940 | vaddr cmd, uint64_t cmd_len) |
| 941 | { |
| 942 | if (use_gdb_syscalls()) { |
| 943 | gdb_system(cs, complete, cmd, cmd_len); |
| 944 | } else { |
| 945 | host_system(cs, complete, cmd, cmd_len); |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, |
| 950 | vaddr tv_addr, vaddr tz_addr) |
| 951 | { |
| 952 | if (use_gdb_syscalls()) { |
| 953 | gdb_gettimeofday(cs, complete, tv_addr, tz_addr); |
| 954 | } else { |
| 955 | host_gettimeofday(cs, complete, tv_addr, tz_addr); |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | #ifndef CONFIG_USER_ONLY |
| 960 | void semihost_sys_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, |
| 961 | int fd, GIOCondition cond, int timeout) |
| 962 | { |
| 963 | GuestFD *gf = get_guestfd(fd); |
| 964 | |
| 965 | if (!gf) { |
| 966 | complete(cs, G_IO_NVAL, 1); |
| 967 | return; |
| 968 | } |
| 969 | switch (gf->type) { |
| 970 | case GuestFDGDB: |
| 971 | complete(cs, G_IO_NVAL, 1); |
| 972 | break; |
| 973 | case GuestFDHost: |
| 974 | host_poll_one(cs, complete, gf, cond, timeout); |
| 975 | break; |
| 976 | case GuestFDConsole: |
| 977 | console_poll_one(cs, complete, gf, cond, timeout); |
| 978 | break; |
| 979 | case GuestFDStatic: |
| 980 | default: |
| 981 | g_assert_not_reached(); |
| 982 | } |
| 983 | } |
| 984 | #endif |