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