1 /* 2 * m68k/ColdFire Semihosting syscall interface 3 * 4 * Copyright (c) 2005-2007 CodeSourcery. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 22 #include "cpu.h" 23 #if defined(CONFIG_USER_ONLY) 24 #include "qemu.h" 25 #define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024) 26 #else 27 #include "exec/gdbstub.h" 28 #include "exec/softmmu-semi.h" 29 #endif 30 #include "qemu/log.h" 31 32 #define HOSTED_EXIT 0 33 #define HOSTED_INIT_SIM 1 34 #define HOSTED_OPEN 2 35 #define HOSTED_CLOSE 3 36 #define HOSTED_READ 4 37 #define HOSTED_WRITE 5 38 #define HOSTED_LSEEK 6 39 #define HOSTED_RENAME 7 40 #define HOSTED_UNLINK 8 41 #define HOSTED_STAT 9 42 #define HOSTED_FSTAT 10 43 #define HOSTED_GETTIMEOFDAY 11 44 #define HOSTED_ISATTY 12 45 #define HOSTED_SYSTEM 13 46 47 typedef uint32_t gdb_mode_t; 48 typedef uint32_t gdb_time_t; 49 50 struct m68k_gdb_stat { 51 uint32_t gdb_st_dev; /* device */ 52 uint32_t gdb_st_ino; /* inode */ 53 gdb_mode_t gdb_st_mode; /* protection */ 54 uint32_t gdb_st_nlink; /* number of hard links */ 55 uint32_t gdb_st_uid; /* user ID of owner */ 56 uint32_t gdb_st_gid; /* group ID of owner */ 57 uint32_t gdb_st_rdev; /* device type (if inode device) */ 58 uint64_t gdb_st_size; /* total size, in bytes */ 59 uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */ 60 uint64_t gdb_st_blocks; /* number of blocks allocated */ 61 gdb_time_t gdb_st_atime; /* time of last access */ 62 gdb_time_t gdb_st_mtime; /* time of last modification */ 63 gdb_time_t gdb_st_ctime; /* time of last change */ 64 } QEMU_PACKED; 65 66 struct gdb_timeval { 67 gdb_time_t tv_sec; /* second */ 68 uint64_t tv_usec; /* microsecond */ 69 } QEMU_PACKED; 70 71 #define GDB_O_RDONLY 0x0 72 #define GDB_O_WRONLY 0x1 73 #define GDB_O_RDWR 0x2 74 #define GDB_O_APPEND 0x8 75 #define GDB_O_CREAT 0x200 76 #define GDB_O_TRUNC 0x400 77 #define GDB_O_EXCL 0x800 78 79 static int translate_openflags(int flags) 80 { 81 int hf; 82 83 if (flags & GDB_O_WRONLY) 84 hf = O_WRONLY; 85 else if (flags & GDB_O_RDWR) 86 hf = O_RDWR; 87 else 88 hf = O_RDONLY; 89 90 if (flags & GDB_O_APPEND) hf |= O_APPEND; 91 if (flags & GDB_O_CREAT) hf |= O_CREAT; 92 if (flags & GDB_O_TRUNC) hf |= O_TRUNC; 93 if (flags & GDB_O_EXCL) hf |= O_EXCL; 94 95 return hf; 96 } 97 98 static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s) 99 { 100 struct m68k_gdb_stat *p; 101 102 if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0))) 103 /* FIXME - should this return an error code? */ 104 return; 105 p->gdb_st_dev = cpu_to_be32(s->st_dev); 106 p->gdb_st_ino = cpu_to_be32(s->st_ino); 107 p->gdb_st_mode = cpu_to_be32(s->st_mode); 108 p->gdb_st_nlink = cpu_to_be32(s->st_nlink); 109 p->gdb_st_uid = cpu_to_be32(s->st_uid); 110 p->gdb_st_gid = cpu_to_be32(s->st_gid); 111 p->gdb_st_rdev = cpu_to_be32(s->st_rdev); 112 p->gdb_st_size = cpu_to_be64(s->st_size); 113 #ifdef _WIN32 114 /* Windows stat is missing some fields. */ 115 p->gdb_st_blksize = 0; 116 p->gdb_st_blocks = 0; 117 #else 118 p->gdb_st_blksize = cpu_to_be64(s->st_blksize); 119 p->gdb_st_blocks = cpu_to_be64(s->st_blocks); 120 #endif 121 p->gdb_st_atime = cpu_to_be32(s->st_atime); 122 p->gdb_st_mtime = cpu_to_be32(s->st_mtime); 123 p->gdb_st_ctime = cpu_to_be32(s->st_ctime); 124 unlock_user(p, addr, sizeof(struct m68k_gdb_stat)); 125 } 126 127 static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err) 128 { 129 target_ulong args = env->dregs[1]; 130 if (put_user_u32(ret, args) || 131 put_user_u32(err, args + 4)) { 132 /* 133 * The m68k semihosting ABI does not provide any way to report this 134 * error to the guest, so the best we can do is log it in qemu. 135 * It is always a guest error not to pass us a valid argument block. 136 */ 137 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value " 138 "discarded because argument block not writable\n"); 139 } 140 } 141 142 static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err) 143 { 144 target_ulong args = env->dregs[1]; 145 if (put_user_u32(ret >> 32, args) || 146 put_user_u32(ret, args + 4) || 147 put_user_u32(err, args + 8)) { 148 /* No way to report this via m68k semihosting ABI; just log it */ 149 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value " 150 "discarded because argument block not writable\n"); 151 } 152 } 153 154 static int m68k_semi_is_fseek; 155 156 static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err) 157 { 158 M68kCPU *cpu = M68K_CPU(cs); 159 CPUM68KState *env = &cpu->env; 160 161 if (m68k_semi_is_fseek) { 162 /* 163 * FIXME: We've already lost the high bits of the fseek 164 * return value. 165 */ 166 m68k_semi_return_u64(env, ret, err); 167 m68k_semi_is_fseek = 0; 168 } else { 169 m68k_semi_return_u32(env, ret, err); 170 } 171 } 172 173 /* 174 * Read the input value from the argument block; fail the semihosting 175 * call if the memory read fails. 176 */ 177 #define GET_ARG(n) do { \ 178 if (get_user_ual(arg ## n, args + (n) * 4)) { \ 179 result = -1; \ 180 errno = EFAULT; \ 181 goto failed; \ 182 } \ 183 } while (0) 184 185 void do_m68k_semihosting(CPUM68KState *env, int nr) 186 { 187 uint32_t args; 188 target_ulong arg0, arg1, arg2, arg3; 189 void *p; 190 void *q; 191 uint32_t len; 192 uint32_t result; 193 194 args = env->dregs[1]; 195 switch (nr) { 196 case HOSTED_EXIT: 197 gdb_exit(env, env->dregs[0]); 198 exit(env->dregs[0]); 199 case HOSTED_OPEN: 200 GET_ARG(0); 201 GET_ARG(1); 202 GET_ARG(2); 203 GET_ARG(3); 204 if (use_gdb_syscalls()) { 205 gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1, 206 arg2, arg3); 207 return; 208 } else { 209 p = lock_user_string(arg0); 210 if (!p) { 211 /* FIXME - check error code? */ 212 result = -1; 213 } else { 214 result = open(p, translate_openflags(arg2), arg3); 215 unlock_user(p, arg0, 0); 216 } 217 } 218 break; 219 case HOSTED_CLOSE: 220 { 221 /* Ignore attempts to close stdin/out/err. */ 222 GET_ARG(0); 223 int fd = arg0; 224 if (fd > 2) { 225 if (use_gdb_syscalls()) { 226 gdb_do_syscall(m68k_semi_cb, "close,%x", arg0); 227 return; 228 } else { 229 result = close(fd); 230 } 231 } else { 232 result = 0; 233 } 234 break; 235 } 236 case HOSTED_READ: 237 GET_ARG(0); 238 GET_ARG(1); 239 GET_ARG(2); 240 len = arg2; 241 if (use_gdb_syscalls()) { 242 gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x", 243 arg0, arg1, len); 244 return; 245 } else { 246 p = lock_user(VERIFY_WRITE, arg1, len, 0); 247 if (!p) { 248 /* FIXME - check error code? */ 249 result = -1; 250 } else { 251 result = read(arg0, p, len); 252 unlock_user(p, arg1, len); 253 } 254 } 255 break; 256 case HOSTED_WRITE: 257 GET_ARG(0); 258 GET_ARG(1); 259 GET_ARG(2); 260 len = arg2; 261 if (use_gdb_syscalls()) { 262 gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x", 263 arg0, arg1, len); 264 return; 265 } else { 266 p = lock_user(VERIFY_READ, arg1, len, 1); 267 if (!p) { 268 /* FIXME - check error code? */ 269 result = -1; 270 } else { 271 result = write(arg0, p, len); 272 unlock_user(p, arg0, 0); 273 } 274 } 275 break; 276 case HOSTED_LSEEK: 277 { 278 uint64_t off; 279 GET_ARG(0); 280 GET_ARG(1); 281 GET_ARG(2); 282 GET_ARG(3); 283 off = (uint32_t)arg2 | ((uint64_t)arg1 << 32); 284 if (use_gdb_syscalls()) { 285 m68k_semi_is_fseek = 1; 286 gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x", 287 arg0, off, arg3); 288 } else { 289 off = lseek(arg0, off, arg3); 290 m68k_semi_return_u64(env, off, errno); 291 } 292 return; 293 } 294 case HOSTED_RENAME: 295 GET_ARG(0); 296 GET_ARG(1); 297 GET_ARG(2); 298 GET_ARG(3); 299 if (use_gdb_syscalls()) { 300 gdb_do_syscall(m68k_semi_cb, "rename,%s,%s", 301 arg0, (int)arg1, arg2, (int)arg3); 302 return; 303 } else { 304 p = lock_user_string(arg0); 305 q = lock_user_string(arg2); 306 if (!p || !q) { 307 /* FIXME - check error code? */ 308 result = -1; 309 } else { 310 result = rename(p, q); 311 } 312 unlock_user(p, arg0, 0); 313 unlock_user(q, arg2, 0); 314 } 315 break; 316 case HOSTED_UNLINK: 317 GET_ARG(0); 318 GET_ARG(1); 319 if (use_gdb_syscalls()) { 320 gdb_do_syscall(m68k_semi_cb, "unlink,%s", 321 arg0, (int)arg1); 322 return; 323 } else { 324 p = lock_user_string(arg0); 325 if (!p) { 326 /* FIXME - check error code? */ 327 result = -1; 328 } else { 329 result = unlink(p); 330 unlock_user(p, arg0, 0); 331 } 332 } 333 break; 334 case HOSTED_STAT: 335 GET_ARG(0); 336 GET_ARG(1); 337 GET_ARG(2); 338 if (use_gdb_syscalls()) { 339 gdb_do_syscall(m68k_semi_cb, "stat,%s,%x", 340 arg0, (int)arg1, arg2); 341 return; 342 } else { 343 struct stat s; 344 p = lock_user_string(arg0); 345 if (!p) { 346 /* FIXME - check error code? */ 347 result = -1; 348 } else { 349 result = stat(p, &s); 350 unlock_user(p, arg0, 0); 351 } 352 if (result == 0) { 353 translate_stat(env, arg2, &s); 354 } 355 } 356 break; 357 case HOSTED_FSTAT: 358 GET_ARG(0); 359 GET_ARG(1); 360 if (use_gdb_syscalls()) { 361 gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x", 362 arg0, arg1); 363 return; 364 } else { 365 struct stat s; 366 result = fstat(arg0, &s); 367 if (result == 0) { 368 translate_stat(env, arg1, &s); 369 } 370 } 371 break; 372 case HOSTED_GETTIMEOFDAY: 373 GET_ARG(0); 374 GET_ARG(1); 375 if (use_gdb_syscalls()) { 376 gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x", 377 arg0, arg1); 378 return; 379 } else { 380 qemu_timeval tv; 381 struct gdb_timeval *p; 382 result = qemu_gettimeofday(&tv); 383 if (result != 0) { 384 if (!(p = lock_user(VERIFY_WRITE, 385 arg0, sizeof(struct gdb_timeval), 0))) { 386 /* FIXME - check error code? */ 387 result = -1; 388 } else { 389 p->tv_sec = cpu_to_be32(tv.tv_sec); 390 p->tv_usec = cpu_to_be64(tv.tv_usec); 391 unlock_user(p, arg0, sizeof(struct gdb_timeval)); 392 } 393 } 394 } 395 break; 396 case HOSTED_ISATTY: 397 GET_ARG(0); 398 if (use_gdb_syscalls()) { 399 gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0); 400 return; 401 } else { 402 result = isatty(arg0); 403 } 404 break; 405 case HOSTED_SYSTEM: 406 GET_ARG(0); 407 GET_ARG(1); 408 if (use_gdb_syscalls()) { 409 gdb_do_syscall(m68k_semi_cb, "system,%s", 410 arg0, (int)arg1); 411 return; 412 } else { 413 p = lock_user_string(arg0); 414 if (!p) { 415 /* FIXME - check error code? */ 416 result = -1; 417 } else { 418 result = system(p); 419 unlock_user(p, arg0, 0); 420 } 421 } 422 break; 423 case HOSTED_INIT_SIM: 424 #if defined(CONFIG_USER_ONLY) 425 { 426 CPUState *cs = env_cpu(env); 427 TaskState *ts = cs->opaque; 428 /* Allocate the heap using sbrk. */ 429 if (!ts->heap_limit) { 430 abi_ulong ret; 431 uint32_t size; 432 uint32_t base; 433 434 base = do_brk(0); 435 size = SEMIHOSTING_HEAP_SIZE; 436 /* Try a big heap, and reduce the size if that fails. */ 437 for (;;) { 438 ret = do_brk(base + size); 439 if (ret >= (base + size)) { 440 break; 441 } 442 size >>= 1; 443 } 444 ts->heap_limit = base + size; 445 } 446 /* 447 * This call may happen before we have writable memory, so return 448 * values directly in registers. 449 */ 450 env->dregs[1] = ts->heap_limit; 451 env->aregs[7] = ts->stack_base; 452 } 453 #else 454 /* 455 * FIXME: This is wrong for boards where RAM does not start at 456 * address zero. 457 */ 458 env->dregs[1] = ram_size; 459 env->aregs[7] = ram_size; 460 #endif 461 return; 462 default: 463 cpu_abort(env_cpu(env), "Unsupported semihosting syscall %d\n", nr); 464 result = 0; 465 } 466 failed: 467 m68k_semi_return_u32(env, result, errno); 468 } 469