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