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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 >> 185 >> 186 int _sos_fork() >> 187 { >> 188 return _sos_syscall0(SOS_SYSCALL_ID_FORK); >> 189 } >> 190 >> 191 >> 192 int _sos_exec(const char * prog) >> 193 { >> 194 return _sos_syscall2(SOS_SYSCALL_ID_EXEC, (unsigned int)prog, >> 195 (unsigned int)strlen(prog)); >> 196 } >> 197 >> 198 >> 199 int _sos_mmap(void ** ptr_hint_addr, size_t len, int prot, int flags, >> 200 const char *resource_path, loff_t offset) >> 201 { >> 202 return _sos_syscall7(SOS_SYSCALL_ID_MMAP, >> 203 (unsigned int)ptr_hint_addr, len, prot, flags, >> 204 (unsigned int)resource_path, >> 205 /* offs64_hi */(offset >> 32), >> 206 /* offs64_lo */(offset & 0xffffffff)); >> 207 } >> 208 >> 209 >> 210 int _sos_munmap(void * start, size_t length) >> 211 { >> 212 return _sos_syscall2(SOS_SYSCALL_ID_MUNMAP, >> 213 (unsigned int)start, >> 214 length); >> 215 } >> 216 >> 217 >> 218 int _sos_mprotect(const void *addr, size_t len, int prot) >> 219 { >> 220 return _sos_syscall3(SOS_SYSCALL_ID_MPROTECT, >> 221 (unsigned int)addr, >> 222 len, >> 223 (unsigned int)prot); >> 224 } >> 225 >> 226 >> 227 int _sos_mresize(void * old_addr, size_t old_len, >> 228 void * *new_addr, size_t new_len, >> 229 unsigned long flags) >> 230 { >> 231 return _sos_syscall5(SOS_SYSCALL_ID_MRESIZE, >> 232 (unsigned int)old_addr, >> 233 old_len, >> 234 (unsigned int)new_addr, >> 235 new_len, >> 236 flags); >> 237 } >> 238 >> 239 >> 240 /** >> 241 * Helper function that represents the start routine of a new user >> 242 * thread created from user space (syscall new_thread). It takes 2 >> 243 * arguments that are passsed in the eax/ebx registers (@see >> 244 * cpu_ustate_init() in hwcore/cpu_context.c): the start function of >> 245 * the new thread (eax), the argument passed to it (ebx). >> 246 */ >> 247 static void thread_routine() >> 248 { >> 249 /* NOTE: variables as named registers is a gcc extension */ >> 250 register unsigned long int reg_arg1 asm("%eax"); >> 251 register unsigned long int reg_arg2 asm("%ebx"); >> 252 >> 253 sos_thread_func_t * func = (sos_thread_func_t*)reg_arg1; >> 254 unsigned long int arg = reg_arg2; >> 255 >> 256 func(arg); >> 257 _sos_exit(0); >> 258 } >> 259 >> 260 >> 261 int _sos_new_thread(sos_thread_func_t *func, >> 262 void* arg, >> 263 size_t stack_size) >> 264 { >> 265 return _sos_syscall4(SOS_SYSCALL_ID_NEW_THREAD, >> 266 (unsigned)thread_routine, >> 267 (unsigned)func, (unsigned)arg, >> 268 stack_size); >> 269 } >> 270 >> 271 >> 272 int _sos_nanosleep(unsigned long int sec, >> 273 unsigned long int nanosec) >> 274 { >> 275 return _sos_syscall2(SOS_SYSCALL_ID_NANOSLEEP, >> 276 sec, nanosec); >> 277 } >> 278 >> 279 >> 280 void * _sos_brk(void * new_top_address) >> 281 { >> 282 return (void*)_sos_syscall1(SOS_SYSCALL_ID_BRK, >> 283 (unsigned)new_top_address); >> 284 }
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