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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 Copyright (C) 2003 Thomas Petazzoni 002 Copyright (C) 2003 Thomas Petazzoni 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 019 020 020 021 /** 021 /** 022 * @file crt.c 022 * @file crt.c 023 * 023 * 024 * The C RunTime environment for the basic sup 024 * The C RunTime environment for the basic support of SOS C user 025 * programs 025 * programs 026 */ 026 */ 027 027 028 #include <hwcore/swintr.h> 028 #include <hwcore/swintr.h> 029 #include <string.h> 029 #include <string.h> 030 #include "crt.h" 030 #include "crt.h" 031 031 032 /** 032 /** 033 * Starter function ! 033 * Starter function ! 034 */ 034 */ 035 void _start() __attribute__((noreturn)); 035 void _start() __attribute__((noreturn)); 036 void _start() 036 void _start() 037 { 037 { 038 /* This starter function expects a main() fu 038 /* This starter function expects a main() function somewhere */ 039 extern int main(); 039 extern int main(); 040 040 041 /* Reset the bss section */ 041 /* Reset the bss section */ 042 extern char _bbss, _ebss; 042 extern char _bbss, _ebss; 043 memset(& _bbss, 0x0, (& _ebss) - (& _bbss)); 043 memset(& _bbss, 0x0, (& _ebss) - (& _bbss)); 044 044 045 _sos_exit(main()); 045 _sos_exit(main()); 046 } 046 } 047 047 048 048 049 /* 049 /* 050 * By convention, the USER SOS programs always 050 * By convention, the USER SOS programs always pass 4 arguments to the 051 * kernel syscall handler: in eax/../edx. For 051 * kernel syscall handler: in eax/../edx. For less arguments, the 052 * unused registers are filled with 0s. For mo 052 * unused registers are filled with 0s. For more arguments, the 4th 053 * syscall parameter gives the address of the 053 * syscall parameter gives the address of the array containing the 054 * remaining arguments. In any case, eax corre 054 * remaining arguments. In any case, eax corresponds to the syscall 055 * IDentifier. 055 * IDentifier. 056 */ 056 */ 057 057 058 058 059 inline 059 inline 060 int _sos_syscall3(int id, 060 int _sos_syscall3(int id, 061 unsigned int arg1, 061 unsigned int arg1, 062 unsigned int arg2, 062 unsigned int arg2, 063 unsigned int arg3) 063 unsigned int arg3) 064 { 064 { 065 int ret; 065 int ret; 066 066 067 asm volatile("movl %1,%%eax \n" 067 asm volatile("movl %1,%%eax \n" 068 "movl %2,%%ebx \n" 068 "movl %2,%%ebx \n" 069 "movl %3,%%ecx \n" 069 "movl %3,%%ecx \n" 070 "movl %4,%%edx \n" 070 "movl %4,%%edx \n" 071 "int %5\n" 071 "int %5\n" 072 "movl %%eax, %0" 072 "movl %%eax, %0" 073 :"=g"(ret) 073 :"=g"(ret) 074 :"g"(id),"g"(arg1),"g"(arg2),"g 074 :"g"(id),"g"(arg1),"g"(arg2),"g"(arg3) 075 ,"i"(SOS_SWINTR_SOS_SYSCALL) 075 ,"i"(SOS_SWINTR_SOS_SYSCALL) 076 :"eax","ebx","ecx","edx"); 076 :"eax","ebx","ecx","edx"); 077 077 078 return ret; 078 return ret; 079 } 079 } 080 080 081 081 082 int _sos_syscall0(int id) 082 int _sos_syscall0(int id) 083 { 083 { 084 return _sos_syscall3(id, 0, 0, 0); 084 return _sos_syscall3(id, 0, 0, 0); 085 } 085 } 086 086 087 087 088 int _sos_syscall1(int id, 088 int _sos_syscall1(int id, 089 unsigned int arg1) 089 unsigned int arg1) 090 { 090 { 091 return _sos_syscall3(id, arg1, 0, 0); 091 return _sos_syscall3(id, arg1, 0, 0); 092 } 092 } 093 093 094 094 095 int _sos_syscall2(int id, 095 int _sos_syscall2(int id, 096 unsigned int arg1, 096 unsigned int arg1, 097 unsigned int arg2) 097 unsigned int arg2) 098 { 098 { 099 return _sos_syscall3(id, arg1, arg2, 0); 099 return _sos_syscall3(id, arg1, arg2, 0); 100 } 100 } 101 101 102 102 103 int _sos_syscall4(int id, 103 int _sos_syscall4(int id, 104 unsigned int arg1, 104 unsigned int arg1, 105 unsigned int arg2, 105 unsigned int arg2, 106 unsigned int arg3, 106 unsigned int arg3, 107 unsigned int arg4) 107 unsigned int arg4) 108 { 108 { 109 unsigned int args[] = { arg3, arg4 }; 109 unsigned int args[] = { arg3, arg4 }; 110 return _sos_syscall3(id, arg1, arg2, (unsign 110 return _sos_syscall3(id, arg1, arg2, (unsigned)args); 111 } 111 } 112 112 113 113 114 int _sos_syscall5(int id, 114 int _sos_syscall5(int id, 115 unsigned int arg1, 115 unsigned int arg1, 116 unsigned int arg2, 116 unsigned int arg2, 117 unsigned int arg3, 117 unsigned int arg3, 118 unsigned int arg4, 118 unsigned int arg4, 119 unsigned int arg5) 119 unsigned int arg5) 120 { 120 { 121 unsigned int args[] = { arg3, arg4, arg5 }; 121 unsigned int args[] = { arg3, arg4, arg5 }; 122 return _sos_syscall3(id, arg1, arg2, (unsign 122 return _sos_syscall3(id, arg1, arg2, (unsigned)args); 123 } 123 } 124 124 125 125 126 int _sos_syscall6(int id, 126 int _sos_syscall6(int id, 127 unsigned int arg1, 127 unsigned int arg1, 128 unsigned int arg2, 128 unsigned int arg2, 129 unsigned int arg3, 129 unsigned int arg3, 130 unsigned int arg4, 130 unsigned int arg4, 131 unsigned int arg5, 131 unsigned int arg5, 132 unsigned int arg6) 132 unsigned int arg6) 133 { 133 { 134 unsigned int args[] = { arg3, arg4, arg5, ar 134 unsigned int args[] = { arg3, arg4, arg5, arg6 }; 135 return _sos_syscall3(id, arg1, arg2, (unsign 135 return _sos_syscall3(id, arg1, arg2, (unsigned)args); 136 } 136 } 137 137 138 138 139 int _sos_syscall7(int id, 139 int _sos_syscall7(int id, 140 unsigned int arg1, 140 unsigned int arg1, 141 unsigned int arg2, 141 unsigned int arg2, 142 unsigned int arg3, 142 unsigned int arg3, 143 unsigned int arg4, 143 unsigned int arg4, 144 unsigned int arg5, 144 unsigned int arg5, 145 unsigned int arg6, 145 unsigned int arg6, 146 unsigned int arg7) 146 unsigned int arg7) 147 { 147 { 148 unsigned int args[] = { arg3, arg4, arg5, ar 148 unsigned int args[] = { arg3, arg4, arg5, arg6, arg7 }; 149 return _sos_syscall3(id, arg1, arg2, (unsign 149 return _sos_syscall3(id, arg1, arg2, (unsigned)args); 150 } 150 } 151 151 152 152 153 int _sos_syscall8(int id, 153 int _sos_syscall8(int id, 154 unsigned int arg1, 154 unsigned int arg1, 155 unsigned int arg2, 155 unsigned int arg2, 156 unsigned int arg3, 156 unsigned int arg3, 157 unsigned int arg4, 157 unsigned int arg4, 158 unsigned int arg5, 158 unsigned int arg5, 159 unsigned int arg6, 159 unsigned int arg6, 160 unsigned int arg7, 160 unsigned int arg7, 161 unsigned int arg8) 161 unsigned int arg8) 162 { 162 { 163 unsigned int args[] = { arg3, arg4, arg5, ar 163 unsigned int args[] = { arg3, arg4, arg5, arg6, arg7, arg8 }; 164 return _sos_syscall3(id, arg1, arg2, (unsign 164 return _sos_syscall3(id, arg1, arg2, (unsigned)args); 165 } 165 } 166 166 167 167 168 void _sos_exit(int status) 168 void _sos_exit(int status) 169 { 169 { 170 _sos_syscall1(SOS_SYSCALL_ID_EXIT, (unsigned 170 _sos_syscall1(SOS_SYSCALL_ID_EXIT, (unsigned)status); 171 171 172 /* Never reached ! */ 172 /* Never reached ! */ 173 for ( ; ; ) 173 for ( ; ; ) 174 ; 174 ; 175 } 175 } 176 176 177 177 178 int _sos_bochs_write(const char * str, unsigne 178 int _sos_bochs_write(const char * str, unsigned length) 179 { 179 { 180 return _sos_syscall2(SOS_SYSCALL_ID_BOCHS_WR 180 return _sos_syscall2(SOS_SYSCALL_ID_BOCHS_WRITE, 181 (unsigned)str, 181 (unsigned)str, 182 length); 182 length); 183 } 183 } 184 184 185 185 186 int _sos_fork() 186 int _sos_fork() 187 { 187 { 188 return _sos_syscall0(SOS_SYSCALL_ID_FORK); 188 return _sos_syscall0(SOS_SYSCALL_ID_FORK); 189 } 189 } 190 190 191 191 192 int _sos_exec(const char * prog) 192 int _sos_exec(const char * prog) 193 { 193 { 194 return _sos_syscall2(SOS_SYSCALL_ID_EXEC, (u 194 return _sos_syscall2(SOS_SYSCALL_ID_EXEC, (unsigned int)prog, 195 (unsigned int)strlen(pr 195 (unsigned int)strlen(prog)); 196 } 196 } 197 197 198 198 199 int _sos_mmap(void ** ptr_hint_addr, size_t le !! 199 int _sos_fakemmap(void ** ptr_hint_addr, size_t len, int prot, int flags, 200 const char *resource_path, loff_ !! 200 const char *resource_path, loff_t offset) 201 { 201 { 202 return _sos_syscall7(SOS_SYSCALL_ID_MMAP, !! 202 return _sos_syscall7(SOS_SYSCALL_ID_FAKEMMAP, 203 (unsigned int)ptr_hint_ 203 (unsigned int)ptr_hint_addr, len, prot, flags, 204 (unsigned int)resource_ 204 (unsigned int)resource_path, 205 /* offs64_hi */(offset 205 /* offs64_hi */(offset >> 32), 206 /* offs64_lo */(offset 206 /* offs64_lo */(offset & 0xffffffff)); 207 } 207 } 208 208 209 209 210 int _sos_munmap(void * start, size_t length) 210 int _sos_munmap(void * start, size_t length) 211 { 211 { 212 return _sos_syscall2(SOS_SYSCALL_ID_MUNMAP, 212 return _sos_syscall2(SOS_SYSCALL_ID_MUNMAP, 213 (unsigned int)start, 213 (unsigned int)start, 214 length); 214 length); 215 } 215 } 216 216 217 217 218 int _sos_mprotect(const void *addr, size_t len 218 int _sos_mprotect(const void *addr, size_t len, int prot) 219 { 219 { 220 return _sos_syscall3(SOS_SYSCALL_ID_MPROTECT 220 return _sos_syscall3(SOS_SYSCALL_ID_MPROTECT, 221 (unsigned int)addr, 221 (unsigned int)addr, 222 len, 222 len, 223 (unsigned int)prot); 223 (unsigned int)prot); 224 } 224 } 225 225 226 226 227 int _sos_mresize(void * old_addr, size_t old_l 227 int _sos_mresize(void * old_addr, size_t old_len, 228 void * *new_addr, size_t new_ 228 void * *new_addr, size_t new_len, 229 unsigned long flags) 229 unsigned long flags) 230 { 230 { 231 return _sos_syscall5(SOS_SYSCALL_ID_MRESIZE, 231 return _sos_syscall5(SOS_SYSCALL_ID_MRESIZE, 232 (unsigned int)old_addr, 232 (unsigned int)old_addr, 233 old_len, 233 old_len, 234 (unsigned int)new_addr, 234 (unsigned int)new_addr, 235 new_len, 235 new_len, 236 flags); 236 flags); 237 } 237 } 238 238 239 239 240 /** 240 /** 241 * Helper function that represents the start r 241 * Helper function that represents the start routine of a new user 242 * thread created from user space (syscall new 242 * thread created from user space (syscall new_thread). It takes 2 243 * arguments that are passsed in the eax/ebx r 243 * arguments that are passsed in the eax/ebx registers (@see 244 * cpu_ustate_init() in hwcore/cpu_context.c): 244 * cpu_ustate_init() in hwcore/cpu_context.c): the start function of 245 * the new thread (eax), the argument passed t 245 * the new thread (eax), the argument passed to it (ebx). 246 */ 246 */ 247 static void thread_routine() 247 static void thread_routine() 248 { 248 { 249 /* NOTE: variables as named registers is a g 249 /* NOTE: variables as named registers is a gcc extension */ 250 register unsigned long int reg_arg1 asm("%ea 250 register unsigned long int reg_arg1 asm("%eax"); 251 register unsigned long int reg_arg2 asm("%eb 251 register unsigned long int reg_arg2 asm("%ebx"); 252 252 253 sos_thread_func_t * func = (sos_thread_func_ 253 sos_thread_func_t * func = (sos_thread_func_t*)reg_arg1; 254 unsigned long int arg = reg_arg2; 254 unsigned long int arg = reg_arg2; 255 255 256 func(arg); 256 func(arg); 257 _sos_exit(0); 257 _sos_exit(0); 258 } 258 } 259 259 260 260 261 int _sos_new_thread(sos_thread_func_t *func, 261 int _sos_new_thread(sos_thread_func_t *func, 262 void* arg, 262 void* arg, 263 size_t stack_size) 263 size_t stack_size) 264 { 264 { 265 return _sos_syscall4(SOS_SYSCALL_ID_NEW_THRE 265 return _sos_syscall4(SOS_SYSCALL_ID_NEW_THREAD, 266 (unsigned)thread_routin 266 (unsigned)thread_routine, 267 (unsigned)func, (unsign 267 (unsigned)func, (unsigned)arg, 268 stack_size); 268 stack_size); 269 } 269 } 270 270 271 271 272 int _sos_nanosleep(unsigned long int sec, 272 int _sos_nanosleep(unsigned long int sec, 273 unsigned long int nanosec) 273 unsigned long int nanosec) 274 { 274 { 275 return _sos_syscall2(SOS_SYSCALL_ID_NANOSLEE 275 return _sos_syscall2(SOS_SYSCALL_ID_NANOSLEEP, 276 sec, nanosec); 276 sec, nanosec); 277 } 277 } 278 278 279 279 280 void * _sos_brk(void * new_top_address) 280 void * _sos_brk(void * new_top_address) 281 { 281 { 282 return (void*)_sos_syscall1(SOS_SYSCALL_ID_B 282 return (void*)_sos_syscall1(SOS_SYSCALL_ID_BRK, 283 (unsigned)new_to 283 (unsigned)new_top_address); >> 284 } >> 285 >> 286 >> 287 int _sos_mount(const char *source, const char *target, >> 288 const char *filesystemtype, unsigned long mountflags, >> 289 const char *args) >> 290 { >> 291 if (!target || !filesystemtype) >> 292 return -1; >> 293 >> 294 return _sos_syscall7(SOS_SYSCALL_ID_MOUNT, >> 295 (unsigned int)source, source?strlen(source):0, >> 296 (unsigned int)target, strlen(target), >> 297 (unsigned int)filesystemtype, >> 298 mountflags, >> 299 (unsigned int)args); >> 300 } >> 301 >> 302 >> 303 int _sos_umount(const char *target) >> 304 { >> 305 if (!target) >> 306 return -1; >> 307 >> 308 return _sos_syscall2(SOS_SYSCALL_ID_UMOUNT, >> 309 (unsigned int)target, >> 310 strlen(target)); >> 311 } >> 312 >> 313 >> 314 void _sos_sync(void) >> 315 { >> 316 _sos_syscall0(SOS_SYSCALL_ID_SYNC); >> 317 } >> 318 >> 319 >> 320 int _sos_statvfs(const char *path, struct statvfs *buf) >> 321 { >> 322 if (! path) >> 323 return -1; >> 324 >> 325 return _sos_syscall3(SOS_SYSCALL_ID_VFSTAT64, >> 326 (unsigned)path, >> 327 strlen(path), >> 328 (unsigned)buf); >> 329 } >> 330 >> 331 >> 332 int _sos_open(const char * pathname, int flags, int mode) >> 333 { >> 334 if (! pathname) >> 335 return -1; >> 336 >> 337 return _sos_syscall4(SOS_SYSCALL_ID_OPEN, >> 338 (unsigned)pathname, >> 339 strlen(pathname), >> 340 flags, >> 341 mode); >> 342 } >> 343 >> 344 >> 345 int _sos_close(int fd) >> 346 { >> 347 return _sos_syscall1(SOS_SYSCALL_ID_CLOSE, fd); >> 348 } >> 349 >> 350 >> 351 int _sos_read(int fd, char * buf, size_t * len) >> 352 { >> 353 return _sos_syscall3(SOS_SYSCALL_ID_READ, fd, >> 354 (unsigned int) buf, >> 355 (unsigned int) len); >> 356 } >> 357 >> 358 >> 359 int _sos_write(int fd, const char * buf, size_t * len) >> 360 { >> 361 return _sos_syscall3(SOS_SYSCALL_ID_WRITE, fd, >> 362 (unsigned int) buf, >> 363 (unsigned int) len); >> 364 } >> 365 >> 366 >> 367 int _sos_seek64(int fd, loff_t * offset, int whence) >> 368 { >> 369 return _sos_syscall3(SOS_SYSCALL_ID_SEEK64, fd, >> 370 (unsigned int)offset, >> 371 (unsigned int)whence); >> 372 } >> 373 >> 374 >> 375 int _sos_fmmap(void ** ptr_hint_addr, size_t len, int prot, int flags, >> 376 int fd, loff_t offset) >> 377 { >> 378 return _sos_syscall7(SOS_SYSCALL_ID_FSMMAP, >> 379 (unsigned int)ptr_hint_addr, len, prot, flags, >> 380 (unsigned int)fd, >> 381 /* offs64_hi */(offset >> 32), >> 382 /* offs64_lo */(offset & 0xffffffff)); >> 383 } >> 384 >> 385 >> 386 int _sos_ftruncate64(int fd, loff_t length) >> 387 { >> 388 return _sos_syscall2(SOS_SYSCALL_ID_FTRUNCATE64, fd, >> 389 (unsigned int)length); >> 390 } >> 391 >> 392 >> 393 int _sos_fcntl(int fd, int cmd, int arg) >> 394 { >> 395 return _sos_syscall3(SOS_SYSCALL_ID_FCNTL, fd, >> 396 (unsigned int)cmd, >> 397 (unsigned int)arg); >> 398 } >> 399 >> 400 >> 401 int _sos_creat(const char *pathname, int mode) >> 402 { >> 403 if (! pathname) >> 404 return -1; >> 405 >> 406 return _sos_syscall3(SOS_SYSCALL_ID_CREAT, >> 407 (unsigned int)pathname, >> 408 strlen(pathname), >> 409 mode); >> 410 } >> 411 >> 412 >> 413 int _sos_link (const char *oldpath, const char *newpath) >> 414 { >> 415 if (!oldpath || !newpath) >> 416 return -1; >> 417 >> 418 return _sos_syscall4(SOS_SYSCALL_ID_LINK, >> 419 (unsigned int)oldpath, >> 420 strlen(oldpath), >> 421 (unsigned int)newpath, >> 422 strlen(newpath)); >> 423 } >> 424 >> 425 >> 426 int _sos_unlink(const char *pathname) >> 427 { >> 428 if (! pathname) >> 429 return -1; >> 430 >> 431 return _sos_syscall2(SOS_SYSCALL_ID_UNLINK, >> 432 (unsigned int)pathname, >> 433 strlen(pathname)); >> 434 } >> 435 >> 436 >> 437 int _sos_rename (const char *oldpath, const char *newpath) >> 438 { >> 439 if (!oldpath || !newpath) >> 440 return -1; >> 441 >> 442 return _sos_syscall4(SOS_SYSCALL_ID_RENAME, >> 443 (unsigned int)oldpath, >> 444 strlen(oldpath), >> 445 (unsigned int)newpath, >> 446 strlen(newpath)); >> 447 } >> 448 >> 449 >> 450 int _sos_symlink(const char *target, const char *path) >> 451 { >> 452 if (!path || !target) >> 453 return -1; >> 454 >> 455 return _sos_syscall4(SOS_SYSCALL_ID_SYMLINK, >> 456 (unsigned int)path, >> 457 strlen(path), >> 458 (unsigned int)target, >> 459 strlen(target)); >> 460 } >> 461 >> 462 >> 463 struct dirent; /* Forward declaration */ >> 464 int _sos_readdir(int fd, struct dirent * dirent) >> 465 { >> 466 return _sos_syscall2(SOS_SYSCALL_ID_READDIR, >> 467 fd, >> 468 (unsigned int)dirent); >> 469 } >> 470 >> 471 >> 472 int _sos_mkdir(const char *pathname, mode_t mode) >> 473 { >> 474 if (!pathname) >> 475 return -1; >> 476 >> 477 return _sos_syscall3(SOS_SYSCALL_ID_MKDIR, >> 478 (unsigned int)pathname, >> 479 strlen(pathname), >> 480 mode); >> 481 } >> 482 >> 483 >> 484 int _sos_rmdir(const char *pathname) >> 485 { >> 486 if (!pathname) >> 487 return -1; >> 488 >> 489 return _sos_syscall2(SOS_SYSCALL_ID_RMDIR, >> 490 (unsigned int)pathname, >> 491 strlen(pathname)); >> 492 } >> 493 >> 494 >> 495 int _sos_chmod(const char *pathname, mode_t mode) >> 496 { >> 497 if (!pathname) >> 498 return -1; >> 499 >> 500 return _sos_syscall3(SOS_SYSCALL_ID_CHMOD, >> 501 (unsigned int)pathname, >> 502 strlen(pathname), >> 503 mode); >> 504 } >> 505 >> 506 >> 507 int _sos_stat(const char *pathname, int nofollow, struct stat * st) >> 508 { >> 509 if (!pathname || !st) >> 510 return -1; >> 511 >> 512 return _sos_syscall4(SOS_SYSCALL_ID_STAT64, >> 513 (unsigned int)pathname, >> 514 strlen(pathname), >> 515 nofollow, >> 516 (unsigned int)st); >> 517 } >> 518 >> 519 >> 520 int _sos_chroot(const char *dirname) >> 521 { >> 522 if (!dirname) >> 523 return -1; >> 524 >> 525 return _sos_syscall2(SOS_SYSCALL_ID_CHROOT, >> 526 (unsigned int)dirname, >> 527 strlen(dirname)); >> 528 } >> 529 >> 530 >> 531 int _sos_chdir(const char *dirname) >> 532 { >> 533 if (!dirname) >> 534 return -1; >> 535 >> 536 return _sos_syscall2(SOS_SYSCALL_ID_CHDIR, >> 537 (unsigned int)dirname, >> 538 strlen(dirname)); >> 539 } >> 540 >> 541 >> 542 int _sos_fchdir(int fd) >> 543 { >> 544 return _sos_syscall1(SOS_SYSCALL_ID_FCHDIR, >> 545 (unsigned int)fd); 284 } 546 }
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