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