2 * AcessOS Microkernel Version
15 #define CHECK_NUM_NULLOK(v,size) \
16 if((v)&&!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
17 #define CHECK_STR_NULLOK(v) \
18 if((v)&&!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
19 #define CHECK_NUM_NONULL(v,size) \
20 if(!(v)||!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
21 #define CHECK_STR_NONULL(v) \
22 if(!(v)||!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
25 extern Uint Binary_Load(const char *file, Uint *entryPoint);
28 void SyscallHandler(tSyscallRegs *Regs);
29 int Syscall_ValidString(const char *Addr);
30 int Syscall_Valid(int Size, const void *Addr);
33 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
34 void SyscallHandler(tSyscallRegs *Regs)
38 int callNum = Regs->Num;
41 if(callNum != SYS_READ && callNum != SYS_WRITE) {
43 ENTER("iThread iNum", Threads_GetTID(), callNum);
44 if(callNum < NUM_SYSCALLS)
45 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
46 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
53 // -- Exit the current thread
54 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
56 // -- Put the current thread to sleep
57 case SYS_SLEEP: Threads_Sleep(); break;
59 // -- Yield current timeslice
60 case SYS_YIELD: Threads_Yield(); break;
62 // -- Set Error Handler
63 case SYS_SETFAULTHANDLER:
64 Threads_SetFaultHandler(Regs->Arg1);
67 // -- Clone the current thread
69 // Call clone system call
70 ret = Proc_Clone(Regs->Arg1);
79 // -- Wait fr an event
82 ret = Threads_WaitEvents(Regs->Arg1);
85 // -- Wait for a thread
87 // Sanity Check (Status can be NULL)
88 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
90 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
93 // -- Get the physical address of a page
95 ret = MM_GetPhysAddr(Regs->Arg1);
99 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
101 // -- Allocate an address
102 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
104 // -- Unmap an address
105 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
107 // -- Get Thread/Process IDs
108 case SYS_GETTID: ret = Threads_GetTID(); break;
109 case SYS_GETPID: ret = Threads_GetPID(); break;
111 // -- Get User/Group IDs
112 case SYS_GETUID: ret = Threads_GetUID(); break;
113 case SYS_GETGID: ret = Threads_GetGID(); break;
115 // -- Set User/Group IDs
116 case SYS_SETUID: ret = Threads_SetUID(Regs->Arg1); break;
117 case SYS_SETGID: ret = Threads_SetGID(Regs->Arg1); break;
121 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
122 // Destination, Size, *Data
123 ret = Proc_SendMessage(Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
125 // -- Check for messages
127 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
128 // NOTE: Can't do range checking as we don't know the size
129 // - Should be done by Proc_GetMessage
130 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
131 err = -EINVAL; ret = -1; break;
134 ret = Proc_GetMessage((Uint*)Regs->Arg1, (void*)Regs->Arg2);
137 // -- Get the current timestamp
142 // -- Set the thread's name
144 CHECK_STR_NONULL( (char*) Regs->Arg1);
145 Threads_SetName( (char*)Regs->Arg1 );
151 // -- Replace the current process with another
153 CHECK_STR_NONULL((char*)Regs->Arg1);
154 // Check the argument arrays
157 char **tmp = (char**)Regs->Arg2;
158 // Check ArgV (traverse array checking all string pointers)
159 CHECK_NUM_NONULL( tmp, sizeof(char**) );
160 //Log("tmp = %p", tmp);
161 for(i=0;tmp[i];i++) {
162 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
163 CHECK_STR_NONULL( tmp[i] );
167 // - EnvP can be NULL
170 tmp = (char**)Regs->Arg3;
171 CHECK_NUM_NONULL(tmp, sizeof(char**));
172 for(i=0;tmp[i];i++) {
173 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
174 CHECK_STR_NONULL( tmp[i] );
179 LEAVE('s', "Assuming 0");
180 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
181 ret = Proc_Execve( (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3, 0 );
183 // -- Load a binary into the current process
185 if( !Syscall_ValidString( (char*) Regs->Arg1)
186 || !Syscall_Valid(sizeof(Uint), (Uint*)Regs->Arg2) ) {
192 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
196 // Virtual Filesystem
199 CHECK_STR_NONULL( (char*)Regs->Arg1 );
200 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
201 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
205 LOG("VFS_Close(%i)", Regs->Arg1);
206 VFS_Close( Regs->Arg1 );
211 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
213 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
218 ret = VFS_Tell( Regs->Arg1 );
222 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
223 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
227 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
228 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
232 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
234 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
239 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
240 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
245 // TODO: What if the filename is longer?
246 // Maybe force it to be a 256 byte buffer
247 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
248 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
251 // Open a file that is a entry in an open directory
253 CHECK_STR_NONULL( (char*)Regs->Arg2 );
254 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
259 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
260 ret = VFS_ChDir( (const char*)Regs->Arg1 );
265 // All sanity checking should be done by the driver
266 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
267 err = -EINVAL; ret = -1; break;
269 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
272 // Mount a filesystem
274 // Only root can mount filesystems
275 if(Threads_GetUID() != 0) {
280 // Sanity check the paths
281 if(!Syscall_ValidString((char*)Regs->Arg1)
282 || !Syscall_ValidString((char*)Regs->Arg2)
283 || !Syscall_ValidString((char*)Regs->Arg3)
284 || !Syscall_ValidString((char*)Regs->Arg4) ) {
290 (char*)Regs->Arg1, // Device
291 (char*)Regs->Arg2, // Mount point
292 (char*)Regs->Arg3, // Filesystem
293 (char*)Regs->Arg4 // Options
297 // Wait on a set of handles
300 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
301 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
302 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
303 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
311 Regs->Arg1, // Max handle
312 (fd_set *)Regs->Arg2, // Read
313 (fd_set *)Regs->Arg3, // Write
314 (fd_set *)Regs->Arg4, // Errors
315 (tTime *)Regs->Arg5, // Timeout
316 (Uint32)Regs->Arg6, // Extra wakeup events
324 CHECK_STR_NONULL( (char*)Regs->Arg1 );
325 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
326 LogF((const char*)Regs->Arg1,
327 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
332 // -- Default (Return Error)
334 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
335 if(Regs->Num < NUM_SYSCALLS)
336 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
342 if(err == 0) err = errno;
345 LOG("ID: %i, Return errno = %i", Regs->Num, err);
349 Regs->Return = ret&0xFFFFFFFF;
350 Regs->RetHi = ret >> 32;
357 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
359 LOG("err = %i", err);
360 if( callNum == SYS_EXECVE )
361 LOG("Actual %i", ret);
371 * \fn int Syscall_ValidString(const char *Addr)
372 * \brief Checks if a memory address contains a valid string
374 int Syscall_ValidString(const char *Addr)
376 // Check if the memory is user memory
377 if(!MM_IsUser( (tVAddr) Addr)) return 0;
379 return CheckString( Addr );
383 * \fn int Syscall_Valid(int Size, const void *Addr)
384 * \brief Checks if a memory address is valid
386 int Syscall_Valid(int Size, const void *Addr)
388 if(!MM_IsUser( (tVAddr)Addr )) return 0;
390 return CheckMem( Addr, Size );