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 "qemu-common.h" 28 #include "exec/gdbstub.h" 29 #include "exec/softmmu-semi.h" 30 #endif 31 #include "qemu/log.h" 32 #include "sysemu/sysemu.h" 33 34 #define HOSTED_EXIT 0 35 #define HOSTED_INIT_SIM 1 36 #define HOSTED_OPEN 2 37 #define HOSTED_CLOSE 3 38 #define HOSTED_READ 4 39 #define HOSTED_WRITE 5 40 #define HOSTED_LSEEK 6 41 #define HOSTED_RENAME 7 42 #define HOSTED_UNLINK 8 43 #define HOSTED_STAT 9 44 #define HOSTED_FSTAT 10 45 #define HOSTED_GETTIMEOFDAY 11 46 #define HOSTED_ISATTY 12 47 #define HOSTED_SYSTEM 13 48 49 typedef uint32_t gdb_mode_t; 50 typedef uint32_t gdb_time_t; 51 52 struct m68k_gdb_stat { 53 uint32_t gdb_st_dev; /* device */ 54 uint32_t gdb_st_ino; /* inode */ 55 gdb_mode_t gdb_st_mode; /* protection */ 56 uint32_t gdb_st_nlink; /* number of hard links */ 57 uint32_t gdb_st_uid; /* user ID of owner */ 58 uint32_t gdb_st_gid; /* group ID of owner */ 59 uint32_t gdb_st_rdev; /* device type (if inode device) */ 60 uint64_t gdb_st_size; /* total size, in bytes */ 61 uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */ 62 uint64_t gdb_st_blocks; /* number of blocks allocated */ 63 gdb_time_t gdb_st_atime; /* time of last access */ 64 gdb_time_t gdb_st_mtime; /* time of last modification */ 65 gdb_time_t gdb_st_ctime; /* time of last change */ 66 } QEMU_PACKED; 67 68 struct gdb_timeval { 69 gdb_time_t tv_sec; /* second */ 70 uint64_t tv_usec; /* microsecond */ 71 } QEMU_PACKED; 72 73 #define GDB_O_RDONLY 0x0 74 #define GDB_O_WRONLY 0x1 75 #define GDB_O_RDWR 0x2 76 #define GDB_O_APPEND 0x8 77 #define GDB_O_CREAT 0x200 78 #define GDB_O_TRUNC 0x400 79 #define GDB_O_EXCL 0x800 80 81 static int translate_openflags(int flags) 82 { 83 int hf; 84 85 if (flags & GDB_O_WRONLY) 86 hf = O_WRONLY; 87 else if (flags & GDB_O_RDWR) 88 hf = O_RDWR; 89 else 90 hf = O_RDONLY; 91 92 if (flags & GDB_O_APPEND) hf |= O_APPEND; 93 if (flags & GDB_O_CREAT) hf |= O_CREAT; 94 if (flags & GDB_O_TRUNC) hf |= O_TRUNC; 95 if (flags & GDB_O_EXCL) hf |= O_EXCL; 96 97 return hf; 98 } 99 100 static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s) 101 { 102 struct m68k_gdb_stat *p; 103 104 if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0))) 105 /* FIXME - should this return an error code? */ 106 return; 107 p->gdb_st_dev = cpu_to_be32(s->st_dev); 108 p->gdb_st_ino = cpu_to_be32(s->st_ino); 109 p->gdb_st_mode = cpu_to_be32(s->st_mode); 110 p->gdb_st_nlink = cpu_to_be32(s->st_nlink); 111 p->gdb_st_uid = cpu_to_be32(s->st_uid); 112 p->gdb_st_gid = cpu_to_be32(s->st_gid); 113 p->gdb_st_rdev = cpu_to_be32(s->st_rdev); 114 p->gdb_st_size = cpu_to_be64(s->st_size); 115 #ifdef _WIN32 116 /* Windows stat is missing some fields. */ 117 p->gdb_st_blksize = 0; 118 p->gdb_st_blocks = 0; 119 #else 120 p->gdb_st_blksize = cpu_to_be64(s->st_blksize); 121 p->gdb_st_blocks = cpu_to_be64(s->st_blocks); 122 #endif 123 p->gdb_st_atime = cpu_to_be32(s->st_atime); 124 p->gdb_st_mtime = cpu_to_be32(s->st_mtime); 125 p->gdb_st_ctime = cpu_to_be32(s->st_ctime); 126 unlock_user(p, addr, sizeof(struct m68k_gdb_stat)); 127 } 128 129 static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err) 130 { 131 target_ulong args = env->dregs[1]; 132 if (put_user_u32(ret, args) || 133 put_user_u32(err, args + 4)) { 134 /* The m68k semihosting ABI does not provide any way to report this 135 * error to the guest, so the best we can do is log it in qemu. 136 * It is always a guest error not to pass us a valid argument block. 137 */ 138 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value " 139 "discarded because argument block not writable\n"); 140 } 141 } 142 143 static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err) 144 { 145 target_ulong args = env->dregs[1]; 146 if (put_user_u32(ret >> 32, args) || 147 put_user_u32(ret, args + 4) || 148 put_user_u32(err, args + 8)) { 149 /* No way to report this via m68k semihosting ABI; just log it */ 150 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value " 151 "discarded because argument block not writable\n"); 152 } 153 } 154 155 static int m68k_semi_is_fseek; 156 157 static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err) 158 { 159 M68kCPU *cpu = M68K_CPU(cs); 160 CPUM68KState *env = &cpu->env; 161 162 if (m68k_semi_is_fseek) { 163 /* FIXME: We've already lost the high bits of the fseek 164 return value. */ 165 m68k_semi_return_u64(env, ret, err); 166 m68k_semi_is_fseek = 0; 167 } else { 168 m68k_semi_return_u32(env, ret, err); 169 } 170 } 171 172 /* Read the input value from the argument block; fail the semihosting 173 * call if the memory read fails. 174 */ 175 #define GET_ARG(n) do { \ 176 if (get_user_ual(arg ## n, args + (n) * 4)) { \ 177 result = -1; \ 178 errno = EFAULT; \ 179 goto failed; \ 180 } \ 181 } while (0) 182 183 void do_m68k_semihosting(CPUM68KState *env, int nr) 184 { 185 uint32_t args; 186 target_ulong arg0, arg1, arg2, arg3; 187 void *p; 188 void *q; 189 uint32_t len; 190 uint32_t result; 191 192 args = env->dregs[1]; 193 switch (nr) { 194 case HOSTED_EXIT: 195 gdb_exit(env, env->dregs[0]); 196 exit(env->dregs[0]); 197 case HOSTED_OPEN: 198 GET_ARG(0); 199 GET_ARG(1); 200 GET_ARG(2); 201 GET_ARG(3); 202 if (use_gdb_syscalls()) { 203 gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1, 204 arg2, arg3); 205 return; 206 } else { 207 p = lock_user_string(arg0); 208 if (!p) { 209 /* FIXME - check error code? */ 210 result = -1; 211 } else { 212 result = open(p, translate_openflags(arg2), arg3); 213 unlock_user(p, arg0, 0); 214 } 215 } 216 break; 217 case HOSTED_CLOSE: 218 { 219 /* Ignore attempts to close stdin/out/err. */ 220 GET_ARG(0); 221 int fd = arg0; 222 if (fd > 2) { 223 if (use_gdb_syscalls()) { 224 gdb_do_syscall(m68k_semi_cb, "close,%x", arg0); 225 return; 226 } else { 227 result = close(fd); 228 } 229 } else { 230 result = 0; 231 } 232 break; 233 } 234 case HOSTED_READ: 235 GET_ARG(0); 236 GET_ARG(1); 237 GET_ARG(2); 238 len = arg2; 239 if (use_gdb_syscalls()) { 240 gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x", 241 arg0, arg1, len); 242 return; 243 } else { 244 p = lock_user(VERIFY_WRITE, arg1, len, 0); 245 if (!p) { 246 /* FIXME - check error code? */ 247 result = -1; 248 } else { 249 result = read(arg0, p, len); 250 unlock_user(p, arg1, len); 251 } 252 } 253 break; 254 case HOSTED_WRITE: 255 GET_ARG(0); 256 GET_ARG(1); 257 GET_ARG(2); 258 len = arg2; 259 if (use_gdb_syscalls()) { 260 gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x", 261 arg0, arg1, len); 262 return; 263 } else { 264 p = lock_user(VERIFY_READ, arg1, len, 1); 265 if (!p) { 266 /* FIXME - check error code? */ 267 result = -1; 268 } else { 269 result = write(arg0, p, len); 270 unlock_user(p, arg0, 0); 271 } 272 } 273 break; 274 case HOSTED_LSEEK: 275 { 276 uint64_t off; 277 GET_ARG(0); 278 GET_ARG(1); 279 GET_ARG(2); 280 GET_ARG(3); 281 off = (uint32_t)arg2 | ((uint64_t)arg1 << 32); 282 if (use_gdb_syscalls()) { 283 m68k_semi_is_fseek = 1; 284 gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x", 285 arg0, off, arg3); 286 } else { 287 off = lseek(arg0, off, arg3); 288 m68k_semi_return_u64(env, off, errno); 289 } 290 return; 291 } 292 case HOSTED_RENAME: 293 GET_ARG(0); 294 GET_ARG(1); 295 GET_ARG(2); 296 GET_ARG(3); 297 if (use_gdb_syscalls()) { 298 gdb_do_syscall(m68k_semi_cb, "rename,%s,%s", 299 arg0, (int)arg1, arg2, (int)arg3); 300 return; 301 } else { 302 p = lock_user_string(arg0); 303 q = lock_user_string(arg2); 304 if (!p || !q) { 305 /* FIXME - check error code? */ 306 result = -1; 307 } else { 308 result = rename(p, q); 309 } 310 unlock_user(p, arg0, 0); 311 unlock_user(q, arg2, 0); 312 } 313 break; 314 case HOSTED_UNLINK: 315 GET_ARG(0); 316 GET_ARG(1); 317 if (use_gdb_syscalls()) { 318 gdb_do_syscall(m68k_semi_cb, "unlink,%s", 319 arg0, (int)arg1); 320 return; 321 } else { 322 p = lock_user_string(arg0); 323 if (!p) { 324 /* FIXME - check error code? */ 325 result = -1; 326 } else { 327 result = unlink(p); 328 unlock_user(p, arg0, 0); 329 } 330 } 331 break; 332 case HOSTED_STAT: 333 GET_ARG(0); 334 GET_ARG(1); 335 GET_ARG(2); 336 if (use_gdb_syscalls()) { 337 gdb_do_syscall(m68k_semi_cb, "stat,%s,%x", 338 arg0, (int)arg1, arg2); 339 return; 340 } else { 341 struct stat s; 342 p = lock_user_string(arg0); 343 if (!p) { 344 /* FIXME - check error code? */ 345 result = -1; 346 } else { 347 result = stat(p, &s); 348 unlock_user(p, arg0, 0); 349 } 350 if (result == 0) { 351 translate_stat(env, arg2, &s); 352 } 353 } 354 break; 355 case HOSTED_FSTAT: 356 GET_ARG(0); 357 GET_ARG(1); 358 if (use_gdb_syscalls()) { 359 gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x", 360 arg0, arg1); 361 return; 362 } else { 363 struct stat s; 364 result = fstat(arg0, &s); 365 if (result == 0) { 366 translate_stat(env, arg1, &s); 367 } 368 } 369 break; 370 case HOSTED_GETTIMEOFDAY: 371 GET_ARG(0); 372 GET_ARG(1); 373 if (use_gdb_syscalls()) { 374 gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x", 375 arg0, arg1); 376 return; 377 } else { 378 qemu_timeval tv; 379 struct gdb_timeval *p; 380 result = qemu_gettimeofday(&tv); 381 if (result != 0) { 382 if (!(p = lock_user(VERIFY_WRITE, 383 arg0, sizeof(struct gdb_timeval), 0))) { 384 /* FIXME - check error code? */ 385 result = -1; 386 } else { 387 p->tv_sec = cpu_to_be32(tv.tv_sec); 388 p->tv_usec = cpu_to_be64(tv.tv_usec); 389 unlock_user(p, arg0, sizeof(struct gdb_timeval)); 390 } 391 } 392 } 393 break; 394 case HOSTED_ISATTY: 395 GET_ARG(0); 396 if (use_gdb_syscalls()) { 397 gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0); 398 return; 399 } else { 400 result = isatty(arg0); 401 } 402 break; 403 case HOSTED_SYSTEM: 404 GET_ARG(0); 405 GET_ARG(1); 406 if (use_gdb_syscalls()) { 407 gdb_do_syscall(m68k_semi_cb, "system,%s", 408 arg0, (int)arg1); 409 return; 410 } else { 411 p = lock_user_string(arg0); 412 if (!p) { 413 /* FIXME - check error code? */ 414 result = -1; 415 } else { 416 result = system(p); 417 unlock_user(p, arg0, 0); 418 } 419 } 420 break; 421 case HOSTED_INIT_SIM: 422 #if defined(CONFIG_USER_ONLY) 423 { 424 CPUState *cs = CPU(m68k_env_get_cpu(env)); 425 TaskState *ts = cs->opaque; 426 /* Allocate the heap using sbrk. */ 427 if (!ts->heap_limit) { 428 abi_ulong ret; 429 uint32_t size; 430 uint32_t base; 431 432 base = do_brk(0); 433 size = SEMIHOSTING_HEAP_SIZE; 434 /* Try a big heap, and reduce the size if that fails. */ 435 for (;;) { 436 ret = do_brk(base + size); 437 if (ret >= (base + size)) { 438 break; 439 } 440 size >>= 1; 441 } 442 ts->heap_limit = base + size; 443 } 444 /* This call may happen before we have writable memory, so return 445 values directly in registers. */ 446 env->dregs[1] = ts->heap_limit; 447 env->aregs[7] = ts->stack_base; 448 } 449 #else 450 /* FIXME: This is wrong for boards where RAM does not start at 451 address zero. */ 452 env->dregs[1] = ram_size; 453 env->aregs[7] = ram_size; 454 #endif 455 return; 456 default: 457 cpu_abort(CPU(m68k_env_get_cpu(env)), "Unsupported semihosting syscall %d\n", nr); 458 result = 0; 459 } 460 failed: 461 m68k_semi_return_u32(env, result, errno); 462 } 463