AcessNative/acesskernel_src/syscalls.c

   1 /*
   2  * Acess2 Native Kernel
   3  * - Acess kernel emulation on another OS using SDL and UDP
   4  *
   5  * Syscall Distribution
   6  */
   7 #define DEBUG   0
   8 #include <acess.h>
   9 #include <threads.h>
  10 #include <events.h>
  11 #if DEBUG == 0
  12 # define DONT_INCLUDE_SYSCALL_NAMES
  13 #endif
  14 #include "../syscalls.h"
  15
  16 // === IMPORTS ===
  17 extern int      Threads_Fork(void);     // AcessNative only function
  18 extern int      Threads_Spawn(int nFD, int FDs[], const void *info);
  19
  20 // === TYPES ===
  21 typedef int     (*tSyscallHandler)(Uint *Errno, const char *Format, void *Args, int *Sizes);
  22
  23 // === MACROS ===
  24 #define SYSCALL6(_name, _fmtstr, _t0, _t1, _t2, _t3, _t4, _t5, _call) int _name(Uint*Errno,const char*Fmt,void*Args,int*Sizes){\
  25         _t0 a0;_t1 a1;_t2 a2;_t3 a3;_t4 a4;_t5 a5;\
  26         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  27         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  28         a1 = *(_t1*)Args;Args+=sizeof(_t1);\
  29         a2 = *(_t2*)Args;Args+=sizeof(_t2);\
  30         a3 = *(_t3*)Args;Args+=sizeof(_t3);\
  31         a4 = *(_t4*)Args;Args+=sizeof(_t4);\
  32         a5 = *(_t5*)Args;Args+=sizeof(_t5);\
  33         LOG("SYSCALL5 '%s' %p %p %p %p %p %p", Fmt, (intptr_t)a0,(intptr_t)a1,(intptr_t)a2,(intptr_t)a3,(intptr_t)a4,(intptr_t)a5);\
  34         _call\
  35 }
  36 #define SYSCALL5(_name, _fmtstr, _t0, _t1, _t2, _t3, _t4, _call) int _name(Uint*Errno,const char*Fmt,void*Args,int*Sizes){\
  37         _t0 a0;_t1 a1;_t2 a2;_t3 a3;_t4 a4;\
  38         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  39         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  40         a1 = *(_t1*)Args;Args+=sizeof(_t1);\
  41         a2 = *(_t2*)Args;Args+=sizeof(_t2);\
  42         a3 = *(_t3*)Args;Args+=sizeof(_t3);\
  43         a4 = *(_t4*)Args;Args+=sizeof(_t4);\
  44         LOG("SYSCALL5 '%s' %p %p %p %p %p", Fmt, (intptr_t)a0,(intptr_t)a1,(intptr_t)a2,(intptr_t)a3,(intptr_t)a4);\
  45         _call\
  46 }
  47 #define SYSCALL4(_name, _fmtstr, _t0, _t1, _t2, _t3, _call) int _name(Uint*Errno,const char*Fmt,void*Args,int*Sizes){\
  48         _t0 a0;_t1 a1;_t2 a2;_t3 a3;\
  49         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  50         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  51         a1 = *(_t1*)Args;Args+=sizeof(_t1);\
  52         a2 = *(_t2*)Args;Args+=sizeof(_t2);\
  53         a3 = *(_t3*)Args;Args+=sizeof(_t3);\
  54         LOG("SYSCALL4 '%s' %p %p %p %p", Fmt, (intptr_t)a0,(intptr_t)a1,(intptr_t)a2,(intptr_t)a3);\
  55         _call\
  56 }
  57
  58 #define SYSCALL3(_name, _fmtstr, _t0, _t1, _t2, _call) int _name(Uint*Errno,const char*Fmt,void*Args,int*Sizes){\
  59         _t0 a0;_t1 a1;_t2 a2;\
  60         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  61         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  62         a1 = *(_t1*)Args;Args+=sizeof(_t1);\
  63         a2 = *(_t2*)Args;Args+=sizeof(_t2);\
  64         LOG("SYSCALL3 '%s' %p %p %p", Fmt, (intptr_t)a0,(intptr_t)a1,(intptr_t)a2);\
  65         _call\
  66 }
  67
  68 #define SYSCALL2(_name, _fmtstr, _t0, _t1, _call) int _name(Uint*Errno,const char*Fmt,void*Args,int*Sizes){\
  69         _t0 a0;_t1 a1;\
  70         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  71         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  72         a1 = *(_t1*)Args;Args+=sizeof(_t1);\
  73         LOG("SYSCALL2 '%s' %p %p", Fmt, (intptr_t)a0,(intptr_t)a1);\
  74         _call;\
  75 }
  76
  77 #define SYSCALL1(_name, _fmtstr, _t0, _call) int _name(Uint*Errno,const char*Fmt, void*Args,int*Sizes){\
  78         _t0 a0;\
  79         if(strcmp(Fmt,_fmtstr)!=0)return 0;\
  80         a0 = *(_t0*)Args;Args+=sizeof(_t0);\
  81         LOG("SYSCALL1 '%s' %p", Fmt,(intptr_t)a0);\
  82         _call;\
  83 }
  84
  85 #define SYSCALL0(_name, _call) int _name(Uint*Errno,const char*Fmt, void*Args,int*Sizes){\
  86         if(strcmp(Fmt,"")!=0)return 0;\
  87         LOG("SYSCALL0");\
  88         _call;\
  89 }
  90
  91 // === CODE ===
  92 int Syscall_Null(Uint*Errno, const char *Format, void *Args, int *Sizes)
  93 {
  94         return 0;
  95 }
  96
  97 SYSCALL1(Syscall_Exit, "i", int,
  98         Threads_Exit(0, a0);
  99         return 0;
 100 );
 101
 102 SYSCALL2(Syscall_Open, "si", const char *, int,
 103         return VFS_Open(a0, a1|VFS_OPENFLAG_USER);
 104 );
 105 SYSCALL1(Syscall_Close, "i", int,
 106         VFS_Close(a0);
 107         return 0;
 108 );
 109 SYSCALL3(Syscall_Read, "iid", int, int, void *,
 110         if( Sizes[2] < a1 ) {
 111                 Log_Warning("Syscalls", "Read - %i < %i", Sizes[2], a1);
 112                 return -1;
 113         }
 114         return VFS_Read(a0, a1, a2);
 115 );
 116 SYSCALL3(Syscall_Write, "iid", int, int, const void *,
 117         if( Sizes[2] < a1 )
 118                 return -1;
 119         return VFS_Write(a0, a1, a2);
 120 );
 121 SYSCALL3(Syscall_Seek, "iIi", int, int64_t, int,
 122         return VFS_Seek(a0, a1, a2);
 123 );
 124 SYSCALL1(Syscall_Tell, "i", int,
 125         return VFS_Tell(a0);
 126 );
 127 SYSCALL3(Syscall_IOCtl, "iid", int, int, void *,
 128         return VFS_IOCtl(a0, a1, a2);
 129 );
 130 SYSCALL3(Syscall_FInfo, "idi", int, void *, int,
 131         if( Sizes[1] < sizeof(tFInfo)+a2*sizeof(tVFS_ACL)) {
 132                 LOG("offsetof(size) = %i", offsetof(tFInfo, size));
 133                 LOG("Bad size %i < %i", Sizes[1], sizeof(tFInfo)+a2*sizeof(tVFS_ACL));
 134                 *Errno = -EINVAL;
 135                 return -1;
 136         }
 137         return VFS_FInfo(a0, a1, a2);
 138 );
 139 SYSCALL2(Syscall_ReadDir, "id", int, char *,
 140         if(Sizes[1] < 255)
 141                 return -1;
 142         return VFS_ReadDir(a0, a1);
 143 );
 144 SYSCALL6(Syscall_select, "iddddi", int, fd_set *, fd_set *, fd_set *, tTime *, unsigned int,
 145         return VFS_Select(a0, a1, a2, a3, a4, a5, 0);
 146 );
 147 SYSCALL3(Syscall_OpenChild, "isi", int, const char *, int,
 148         return VFS_OpenChild(a0, a1, a2|VFS_OPENFLAG_USER);
 149 );
 150 SYSCALL2(Syscall_GetACL, "id", int, void *,
 151         if(Sizes[1] < sizeof(tVFS_ACL))
 152                 return -1;
 153         return VFS_GetACL(a0, (void*)a1);
 154 );
 155 SYSCALL4(Syscall_Mount, "ssss", const char *, const char *, const char *, const char *,
 156         return VFS_Mount(a0, a1, a2, a3);
 157 );
 158 SYSCALL1(Syscall_Chdir, "s", const char *,
 159         return VFS_ChDir(a0);
 160 );
 161 SYSCALL0(Syscall_Sleep,
 162         Threads_Sleep();
 163         return 0;
 164 );
 165 SYSCALL2(Syscall_WaitTID, "id", int, int *,
 166         if(Sizes[1] < sizeof(int))
 167                 return -1;
 168         return Threads_WaitTID(a0, a1);
 169 );
 170 SYSCALL1(Syscall_SetUID, "i", int,
 171         if(Sizes[0] < sizeof(int)) {
 172                 *Errno = -EINVAL;       // TODO: Better message
 173                 return -1;
 174         }
 175         return Threads_SetUID(a0);
 176 );
 177 SYSCALL1(Syscall_SetGID, "i", int,
 178         if(Sizes[0] < sizeof(int)) {
 179                 *Errno = -EINVAL;       // TODO: Better message
 180                 return -1;
 181         }
 182         return Threads_SetGID(a0);
 183 );
 184
 185 SYSCALL0(Syscall_GetTID, return Threads_GetTID());
 186 SYSCALL0(Syscall_GetPID, return Threads_GetPID());
 187 SYSCALL0(Syscall_GetUID, return Threads_GetUID());
 188 SYSCALL0(Syscall_GetGID, return Threads_GetGID());
 189
 190 SYSCALL1(Syscall_AN_Fork, "d", int *,
 191         if(Sizes[0] < sizeof(int))
 192                 return -1;
 193         *a0 = Threads_Fork();
 194         return *a0;
 195 );
 196
 197 SYSCALL3(Syscall_AN_Spawn, "ddd", int *, int *, void *,
 198         if(Sizes[0] < sizeof(int))
 199                 return -1;
 200         *a0 = Threads_Spawn(Sizes[1] / sizeof(int), a1, a2);
 201         return *a0;
 202 );
 203
 204 SYSCALL2(Syscall_SendMessage, "id", int, void *,
 205         return Proc_SendMessage(a0, Sizes[1], a1);
 206 );
 207
 208 SYSCALL2(Syscall_GetMessage, "dd", uint32_t *, void *,
 209         if( a0 && Sizes[0] < sizeof(*a0) ) {
 210                 Log_Notice("Syscalls", "Syscall_GetMessage - Arg 1 Undersize (%i < %i)",
 211                         Sizes[0], sizeof(*a0));
 212                 return -1;
 213         }
 214         Uint    tmp;
 215          int    rv;
 216         if( a0 ) {
 217                 rv = Proc_GetMessage(&tmp, Sizes[1], a1);
 218                 *a0 = tmp;
 219         }
 220         else
 221                 rv = Proc_GetMessage(NULL, Sizes[1], a1);
 222         return rv;
 223 );
 224
 225 SYSCALL1(Syscall_WaitEvent, "i", int,
 226         return Threads_WaitEvents(a0);
 227 );
 228
 229 const tSyscallHandler   caSyscalls[] = {
 230         Syscall_Null,
 231         Syscall_Exit,
 232         Syscall_Open,
 233         Syscall_Close,
 234         Syscall_Read,
 235         Syscall_Write,
 236         Syscall_Seek,
 237         Syscall_Tell,
 238         Syscall_IOCtl,
 239         Syscall_FInfo,
 240         Syscall_ReadDir,
 241         Syscall_OpenChild,
 242         Syscall_GetACL,
 243         Syscall_Mount,
 244         NULL,   // SYS_REOPEN
 245         Syscall_Chdir,
 246
 247         Syscall_WaitTID,
 248         Syscall_SetUID,
 249         Syscall_SetGID,
 250
 251         Syscall_GetTID,
 252         Syscall_GetPID,
 253         Syscall_GetUID,
 254         Syscall_GetGID,
 255
 256         Syscall_Sleep,
 257         Syscall_AN_Fork,
 258         Syscall_AN_Spawn,
 259
 260         Syscall_SendMessage,
 261         Syscall_GetMessage,
 262         Syscall_select,
 263         Syscall_WaitEvent
 264 };
 265 const int       ciNumSyscalls = sizeof(caSyscalls)/sizeof(caSyscalls[0]);
 266 /**
 267  * \brief Recieve a syscall structure from the server code
 268  */
 269 tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength)
 270 {
 271         char    formatString[Request->NParams+1];
 272         char    *inData = (char*)&Request->Params[Request->NParams];
 273          int    argListLen = 0;
 274          int    i, retVal;
 275         tRequestHeader  *ret;
 276          int    retValueCount = 1;
 277          int    retDataLen = sizeof(Uint64);
 278         void    *returnData[Request->NParams];
 279          int    argSizes[Request->NParams];
 280         Uint    ret_errno = 0;
 281
 282         // Sanity check
 283         if( Request->CallID >= ciNumSyscalls ) {
 284                 Log_Notice("Syscalls", "Unknown syscall number %i", Request->CallID);
 285                 return NULL;
 286         }
 287
 288         if( !caSyscalls[Request->CallID] ) {
 289                 Log_Notice("Syscalls", "Unimplemented syscall %i", Request->CallID);
 290                 return NULL;
 291         }
 292
 293         // Get size of argument list
 294         for( i = 0; i < Request->NParams; i ++ )
 295         {
 296                 argSizes[i] = Request->Params[i].Length;
 297                 switch(Request->Params[i].Type)
 298                 {
 299                 case ARG_TYPE_VOID:
 300                         formatString[i] = '-';
 301                         break;
 302                 case ARG_TYPE_INT32:
 303                         formatString[i] = 'i';
 304                         argListLen += sizeof(Uint32);
 305                         break;
 306                 case ARG_TYPE_INT64:
 307                         formatString[i] = 'I';
 308                         argListLen += sizeof(Uint64);
 309                         break;
 310                 case ARG_TYPE_DATA:
 311                         formatString[i] = 'd';
 312                         argListLen += sizeof(void*);
 313                         break;
 314                 case ARG_TYPE_STRING:
 315                         formatString[i] = 's';
 316                         argListLen += sizeof(char*);
 317                         break;
 318                 default:
 319                         return NULL;    // ERROR!
 320                 }
 321         }
 322         formatString[i] = '\0';
 323
 324         LOG("Request %i(%s) '%s'", Request->CallID, casSYSCALL_NAMES[Request->CallID], formatString);
 325
 326         {
 327                 char    argListData[argListLen];
 328                 argListLen = 0;
 329                 // Build argument list
 330                 for( i = 0; i < Request->NParams; i ++ )
 331                 {
 332                         returnData[i] = NULL;
 333                         switch(Request->Params[i].Type)
 334                         {
 335                         case ARG_TYPE_VOID:
 336                                 break;
 337                         case ARG_TYPE_INT32:
 338                                 //LOG("%i INT32: 0x%x", i, *(Uint32*)inData);
 339                                 *(Uint32*)&argListData[argListLen] = *(Uint32*)inData;
 340                                 argListLen += sizeof(Uint32);
 341                                 inData += sizeof(Uint32);
 342                                 break;
 343                         case ARG_TYPE_INT64:
 344                                 //LOG("%i INT64: 0x%llx", i, *(Uint64*)inData);
 345                                 *(Uint64*)&argListData[argListLen] = *(Uint64*)inData;
 346                                 argListLen += sizeof(Uint64);
 347                                 inData += sizeof(Uint64);
 348                                 break;
 349                         case ARG_TYPE_STRING:
 350                                 //LOG("%i STR: '%s'", i, (char*)inData);
 351                                 *(char**)&argListData[argListLen] = (char*)inData;
 352                                 argListLen += sizeof(void*);
 353                                 inData += Request->Params[i].Length;
 354                                 break;
 355
 356                         // Data gets special handling, because only it can be returned to the user
 357                         // (ARG_TYPE_DATA is a pointer)
 358                         case ARG_TYPE_DATA:
 359                                 // Prepare the return values
 360                                 if( Request->Params[i].Flags & ARG_FLAG_RETURN )
 361                                 {
 362                                         retDataLen += Request->Params[i].Length;
 363                                         retValueCount ++;
 364                                 }
 365
 366                                 // Check for non-resident data
 367                                 if( Request->Params[i].Length == 0 )
 368                                 {
 369                                         returnData[i] = NULL;
 370                                         *(void**)&argListData[argListLen] = NULL;
 371                                         argListLen += sizeof(void*);
 372                                 }
 373                                 else if( Request->Params[i].Flags & ARG_FLAG_ZEROED )
 374                                 {
 375                                         // Allocate and zero the buffer
 376                                         returnData[i] = calloc(1, Request->Params[i].Length);
 377                                         //LOG("%i ZDAT: %i %p", i,
 378                                         //      Request->Params[i].Length, returnData[i]);
 379                                         *(void**)&argListData[argListLen] = returnData[i];
 380                                         argListLen += sizeof(void*);
 381                                 }
 382                                 else
 383                                 {
 384                                         returnData[i] = (void*)inData;
 385                                         //LOG("%i DATA: %i %p", i,
 386                                         //      Request->Params[i].Length, returnData[i]);
 387                                         *(void**)&argListData[argListLen] = (void*)inData;
 388                                         argListLen += sizeof(void*);
 389                                         inData += Request->Params[i].Length;
 390                                 }
 391                                 break;
 392                         }
 393                 }
 394
 395                 retVal = caSyscalls[Request->CallID](&ret_errno, formatString, argListData, argSizes);
 396         }
 397
 398         // Allocate the return
 399         size_t  msglen = sizeof(tRequestHeader) + retValueCount * sizeof(tRequestValue) + retDataLen;
 400         ret = malloc(msglen);
 401         ret->ClientID = Request->ClientID;
 402         ret->CallID = Request->CallID;
 403         ret->NParams = retValueCount;
 404         ret->MessageLength = msglen;
 405         inData = (char*)&ret->Params[ ret->NParams ];
 406
 407         // Static Uint64 return value
 408         ret->Params[0].Type = ARG_TYPE_INT64;
 409         ret->Params[0].Flags = 0;
 410         ret->Params[0].Length = sizeof(Uint64);
 411         *(Uint64*)inData = retVal;
 412         inData += sizeof(Uint64);
 413
 414         //Log_Debug("Syscalls", "Return 0x%llx", retVal);
 415
 416         retValueCount = 1;
 417         for( i = 0; i < Request->NParams; i ++ )
 418         {
 419                 if( Request->Params[i].Type != ARG_TYPE_DATA )  continue;
 420                 if( !(Request->Params[i].Flags & ARG_FLAG_RETURN) )     continue;
 421
 422                 ret->Params[retValueCount].Type = Request->Params[i].Type;
 423                 ret->Params[retValueCount].Flags = 0;
 424                 ret->Params[retValueCount].Length = Request->Params[i].Length;
 425
 426                 LOG("Ret %i: Type %i, Len %i",
 427                         i, Request->Params[i].Type, Request->Params[i].Length);
 428
 429                 memcpy(inData, returnData[i], Request->Params[i].Length);
 430                 inData += Request->Params[i].Length;
 431
 432                 if( Request->Params[i].Flags & ARG_FLAG_ZEROED )
 433                         free( returnData[i] );  // Free temp buffer from above
 434                 retValueCount ++;
 435         }
 436
 437         *ReturnLength = sizeof(tRequestHeader)
 438                 + retValueCount * sizeof(tRequestValue)
 439                 + retDataLen;
 440
 441         return ret;
 442 }