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   1
   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("SYSCALL6 '%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         int rv = VFS_Open(a0, a1|VFS_OPENFLAG_USER);
 104         if(rv == -1)    *Errno = errno;
 105         return rv;
 106 );
 107 SYSCALL1(Syscall_Close, "i", int,
 108         VFS_Close(a0);
 109         return 0;
 110 );
 111 SYSCALL3(Syscall_Read, "iid", int, int, void *,
 112         if( Sizes[2] < a1 ) {
 113                 Log_Warning("Syscalls", "Read - %i < %i", Sizes[2], a1);
 114                 return -1;
 115         }
 116         size_t rv = VFS_Read(a0, a1, a2);
 117         if(rv == -1)    *Errno = errno;
 118         return rv;
 119 );
 120 SYSCALL3(Syscall_Write, "iid", int, int, const void *,
 121         if( Sizes[2] < a1 ) {
 122                 *Errno = EINVAL;
 123                 return -1;
 124         }
 125         size_t rv = VFS_Write(a0, a1, a2);
 126         if(rv == -1)    *Errno = errno;
 127         return rv;
 128 );
 129 SYSCALL3(Syscall_Seek, "iIi", int, int64_t, int,
 130         return VFS_Seek(a0, a1, a2);
 131 );
 132 SYSCALL1(Syscall_Tell, "i", int,
 133         return VFS_Tell(a0);
 134 );
 135 SYSCALL3(Syscall_IOCtl, "iid", int, int, void *,
 136         return VFS_IOCtl(a0, a1, a2);
 137 );
 138 SYSCALL3(Syscall_FInfo, "idi", int, void *, int,
 139         if( Sizes[1] < sizeof(tFInfo)+a2*sizeof(tVFS_ACL)) {
 140                 //LOG("offsetof(size) = %i", offsetof(tFInfo, size));
 141                 LOG("Bad size %i < %i", Sizes[1], sizeof(tFInfo)+a2*sizeof(tVFS_ACL));
 142                 *Errno = -EINVAL;
 143                 return -1;
 144         }
 145         return VFS_FInfo(a0, a1, a2);
 146 );
 147 SYSCALL2(Syscall_ReadDir, "id", int, char *,
 148         if(Sizes[1] < 255)
 149                 return -1;
 150         return VFS_ReadDir(a0, a1);
 151 );
 152 SYSCALL6(Syscall_select, "iddddi", int, fd_set *, fd_set *, fd_set *, tTime *, unsigned int,
 153         return VFS_Select(a0, a1, a2, a3, a4, a5, 0);
 154 );
 155 SYSCALL3(Syscall_OpenChild, "isi", int, const char *, int,
 156         return VFS_OpenChild(a0, a1, a2|VFS_OPENFLAG_USER);
 157 );
 158 SYSCALL2(Syscall_GetACL, "id", int, void *,
 159         if(Sizes[1] < sizeof(tVFS_ACL))
 160                 return -1;
 161         return VFS_GetACL(a0, (void*)a1);
 162 );
 163 SYSCALL4(Syscall_Mount, "ssss", const char *, const char *, const char *, const char *,
 164         return VFS_Mount(a0, a1, a2, a3);
 165 );
 166 SYSCALL1(Syscall_Chdir, "s", const char *,
 167         return VFS_ChDir(a0);
 168 );
 169 SYSCALL0(Syscall_Sleep,
 170         Threads_Sleep();
 171         return 0;
 172 );
 173 SYSCALL2(Syscall_WaitTID, "id", int, int *,
 174         if(Sizes[1] < sizeof(int))
 175                 return -1;
 176         return Threads_WaitTID(a0, a1);
 177 );
 178 SYSCALL1(Syscall_SetUID, "i", int,
 179         if(Sizes[0] < sizeof(int)) {
 180                 *Errno = -EINVAL;       // TODO: Better message
 181                 return -1;
 182         }
 183         return Threads_SetUID(a0);
 184 );
 185 SYSCALL1(Syscall_SetGID, "i", int,
 186         if(Sizes[0] < sizeof(int)) {
 187                 *Errno = -EINVAL;       // TODO: Better message
 188                 return -1;
 189         }
 190         return Threads_SetGID(a0);
 191 );
 192
 193 SYSCALL0(Syscall_GetTID, return Threads_GetTID());
 194 SYSCALL0(Syscall_GetPID, return Threads_GetPID());
 195 SYSCALL0(Syscall_GetUID, return Threads_GetUID());
 196 SYSCALL0(Syscall_GetGID, return Threads_GetGID());
 197
 198 SYSCALL1(Syscall_AN_Fork, "d", int *,
 199         if(Sizes[0] < sizeof(int))
 200                 return -1;
 201         *a0 = Threads_Fork();
 202         return *a0;
 203 );
 204
 205 SYSCALL3(Syscall_AN_Spawn, "ddd", int *, int *, void *,
 206         if(Sizes[0] < sizeof(int))
 207                 return -1;
 208         *a0 = Threads_Spawn(Sizes[1] / sizeof(int), a1, a2);
 209         return *a0;
 210 );
 211
 212 SYSCALL2(Syscall_SendMessage, "id", int, void *,
 213         return Proc_SendMessage(a0, Sizes[1], a1);
 214 );
 215
 216 SYSCALL2(Syscall_GetMessage, "dd", uint32_t *, void *,
 217         if( a0 && Sizes[0] < sizeof(*a0) ) {
 218                 Log_Notice("Syscalls", "Syscall_GetMessage - Arg 1 Undersize (%i < %i)",
 219                         Sizes[0], sizeof(*a0));
 220                 return -1;
 221         }
 222         Uint    tmp;
 223          int    rv;
 224         if( a0 ) {
 225                 rv = Proc_GetMessage(&tmp, Sizes[1], a1);
 226                 *a0 = tmp;
 227         }
 228         else
 229                 rv = Proc_GetMessage(NULL, Sizes[1], a1);
 230         return rv;
 231 );
 232
 233 SYSCALL1(Syscall_WaitEvent, "i", int,
 234         return Threads_WaitEvents(a0);
 235 );
 236
 237 const tSyscallHandler   caSyscalls[] = {
 238         Syscall_Null,
 239         Syscall_Exit,
 240         Syscall_Open,
 241         Syscall_Close,
 242         Syscall_Read,
 243         Syscall_Write,
 244         Syscall_Seek,
 245         Syscall_Tell,
 246         Syscall_IOCtl,
 247         Syscall_FInfo,
 248         Syscall_ReadDir,
 249         Syscall_OpenChild,
 250         Syscall_GetACL,
 251         Syscall_Mount,
 252         NULL,   // SYS_REOPEN
 253         Syscall_Chdir,
 254
 255         Syscall_WaitTID,
 256         Syscall_SetUID,
 257         Syscall_SetGID,
 258
 259         Syscall_GetTID,
 260         Syscall_GetPID,
 261         Syscall_GetUID,
 262         Syscall_GetGID,
 263
 264         Syscall_Sleep,
 265         Syscall_AN_Fork,
 266         Syscall_AN_Spawn,
 267
 268         Syscall_SendMessage,
 269         Syscall_GetMessage,
 270         Syscall_select,
 271         Syscall_WaitEvent
 272 };
 273 const int       ciNumSyscalls = sizeof(caSyscalls)/sizeof(caSyscalls[0]);
 274 /**
 275  * \brief Recieve a syscall structure from the server code
 276  */
 277 tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength)
 278 {
 279         char    formatString[Request->NParams+1];
 280         char    *inData = (char*)&Request->Params[Request->NParams];
 281          int    argListLen = 0;
 282          int    i, retVal;
 283         tRequestHeader  *ret;
 284          int    retValueCount;
 285          int    retDataLen;
 286         void    *returnData[Request->NParams];
 287          int    argSizes[Request->NParams];
 288         Uint    ret_errno = 0;
 289
 290         // Clear errno (Acess verson) at the start of the request
 291         errno = 0;
 292
 293         // Sanity check
 294         if( Request->CallID >= ciNumSyscalls ) {
 295                 Log_Notice("Syscalls", "Unknown syscall number %i", Request->CallID);
 296                 return NULL;
 297         }
 298
 299         if( !caSyscalls[Request->CallID] ) {
 300                 Log_Notice("Syscalls", "Unimplemented syscall %i", Request->CallID);
 301                 return NULL;
 302         }
 303
 304         // Init return count/size
 305         retValueCount = 2;
 306         retDataLen = sizeof(Uint64) + sizeof(Uint32);
 307
 308         // Get size of argument list
 309         for( i = 0; i < Request->NParams; i ++ )
 310         {
 311                 argSizes[i] = Request->Params[i].Length;
 312                 switch(Request->Params[i].Type)
 313                 {
 314                 case ARG_TYPE_VOID:
 315                         formatString[i] = '-';
 316                         break;
 317                 case ARG_TYPE_INT32:
 318                         formatString[i] = 'i';
 319                         argListLen += sizeof(Uint32);
 320                         break;
 321                 case ARG_TYPE_INT64:
 322                         formatString[i] = 'I';
 323                         argListLen += sizeof(Uint64);
 324                         break;
 325                 case ARG_TYPE_DATA:
 326                         formatString[i] = 'd';
 327                         argListLen += sizeof(void*);
 328                         // Prepare the return values
 329                         if( Request->Params[i].Flags & ARG_FLAG_RETURN )
 330                         {
 331                                 retDataLen += Request->Params[i].Length;
 332                                 retValueCount ++;
 333                         }
 334                         break;
 335                 case ARG_TYPE_STRING:
 336                         formatString[i] = 's';
 337                         argListLen += sizeof(char*);
 338                         break;
 339                 default:
 340                         Log_Error("Syscalls", "Unknown param type %i", Request->Params[i].Type);
 341                         return NULL;    // ERROR!
 342                 }
 343         }
 344         formatString[i] = '\0';
 345
 346         LOG("Request %i(%s) '%s'", Request->CallID, casSYSCALL_NAMES[Request->CallID], formatString);
 347
 348         {
 349                 char    argListData[argListLen];
 350                 argListLen = 0;
 351                 // Build argument list
 352                 for( i = 0; i < Request->NParams; i ++ )
 353                 {
 354                         returnData[i] = NULL;
 355                         switch(Request->Params[i].Type)
 356                         {
 357                         case ARG_TYPE_VOID:
 358                                 break;
 359                         case ARG_TYPE_INT32:
 360                                 //LOG("%i INT32: 0x%x", i, *(Uint32*)inData);
 361                                 *(Uint32*)&argListData[argListLen] = *(Uint32*)inData;
 362                                 argListLen += sizeof(Uint32);
 363                                 inData += sizeof(Uint32);
 364                                 break;
 365                         case ARG_TYPE_INT64:
 366                                 //LOG("%i INT64: 0x%llx", i, *(Uint64*)inData);
 367                                 *(Uint64*)&argListData[argListLen] = *(Uint64*)inData;
 368                                 argListLen += sizeof(Uint64);
 369                                 inData += sizeof(Uint64);
 370                                 break;
 371                         case ARG_TYPE_STRING:
 372                                 //LOG("%i STR: '%s'", i, (char*)inData);
 373                                 *(char**)&argListData[argListLen] = (char*)inData;
 374                                 argListLen += sizeof(void*);
 375                                 inData += Request->Params[i].Length;
 376                                 break;
 377
 378                         // Data gets special handling, because only it can be returned to the user
 379                         // (ARG_TYPE_DATA is a pointer)
 380                         case ARG_TYPE_DATA:
 381                                 // Check for non-resident data
 382                                 if( Request->Params[i].Length == 0 )
 383                                 {
 384                                         returnData[i] = NULL;
 385                                         *(void**)&argListData[argListLen] = NULL;
 386                                         argListLen += sizeof(void*);
 387                                 }
 388                                 else if( Request->Params[i].Flags & ARG_FLAG_ZEROED )
 389                                 {
 390                                         // Allocate and zero the buffer
 391                                         returnData[i] = calloc(1, Request->Params[i].Length);
 392                                         //LOG("%i ZDAT: %i %p", i,
 393                                         //      Request->Params[i].Length, returnData[i]);
 394                                         *(void**)&argListData[argListLen] = returnData[i];
 395                                         argListLen += sizeof(void*);
 396                                 }
 397                                 else
 398                                 {
 399                                         returnData[i] = (void*)inData;
 400                                         //LOG("%i DATA: %i %p", i,
 401                                         //      Request->Params[i].Length, returnData[i]);
 402                                         *(void**)&argListData[argListLen] = (void*)inData;
 403                                         argListLen += sizeof(void*);
 404                                         inData += Request->Params[i].Length;
 405                                 }
 406                                 break;
 407                         }
 408                 }
 409
 410                 // --- Perform request
 411                 retVal = caSyscalls[Request->CallID](&ret_errno, formatString, argListData, argSizes);
 412         }
 413
 414         // ---------- Return
 415
 416         if( ret_errno == 0 && errno != 0 ) {
 417                 ret_errno = errno;
 418                 LOG("errno = %i", errno);
 419         }
 420
 421         // Allocate the return
 422         size_t  msglen = sizeof(tRequestHeader) + retValueCount * sizeof(tRequestValue) + retDataLen;
 423         ret = malloc(msglen);
 424         ret->ClientID = Request->ClientID;
 425         ret->CallID = Request->CallID;
 426         ret->NParams = retValueCount;
 427         ret->MessageLength = msglen;
 428         inData = (char*)&ret->Params[ ret->NParams ];
 429
 430         // Static Uint64 return value
 431         ret->Params[0].Type = ARG_TYPE_INT64;
 432         ret->Params[0].Flags = 0;
 433         ret->Params[0].Length = sizeof(Uint64);
 434         *(Uint64*)inData = retVal;
 435         inData += sizeof(Uint64);
 436
 437         // Static Uint32 errno value
 438         ret->Params[1].Type = ARG_TYPE_INT32;
 439         ret->Params[1].Flags = 0;
 440         ret->Params[1].Length = sizeof(Uint32);
 441         *(Uint32*)inData = ret_errno;
 442         inData += sizeof(Uint32);
 443
 444         LOG("Ret: %llx, errno=%i", retVal, ret_errno);
 445
 446         //Log_Debug("Syscalls", "Return 0x%llx", retVal);
 447
 448         retValueCount = 2;
 449         for( i = 0; i < Request->NParams; i ++ )
 450         {
 451                 if( Request->Params[i].Type != ARG_TYPE_DATA )  continue;
 452                 if( !(Request->Params[i].Flags & ARG_FLAG_RETURN) )     continue;
 453
 454                 ret->Params[retValueCount].Type = Request->Params[i].Type;
 455                 ret->Params[retValueCount].Flags = 0;
 456                 ret->Params[retValueCount].Length = Request->Params[i].Length;
 457
 458                 LOG("Ret %i: Type %i, Len %i",
 459                         i, Request->Params[i].Type, Request->Params[i].Length);
 460
 461                 memcpy(inData, returnData[i], Request->Params[i].Length);
 462                 inData += Request->Params[i].Length;
 463
 464                 if( Request->Params[i].Flags & ARG_FLAG_ZEROED )
 465                         free( returnData[i] );  // Free temp buffer from above
 466                 retValueCount ++;
 467         }
 468
 469         *ReturnLength = ret->MessageLength;
 470
 471         return ret;
 472 }