2 * AcessOS Microkernel Version
12 #define CHECK_NUM_NULLOK(v,size) \
13 if((v)&&!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
14 #define CHECK_STR_NULLOK(v) \
15 if((v)&&!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
16 #define CHECK_NUM_NONULL(v,size) \
17 if(!(v)||!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
18 #define CHECK_STR_NONULL(v) \
19 if(!(v)||!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
22 extern int Proc_Clone(Uint *Err, Uint Flags);
23 extern int Threads_WaitTID(int TID, int *status);
24 extern Uint Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
25 extern int Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
26 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
27 extern Uint Binary_Load(char *file, Uint *entryPoint);
28 extern int Threads_SetName(char *NewName);
29 extern int Threads_SetUID(Uint *errno, tUID ID);
30 extern int Threads_SetGID(Uint *errno, tGID ID);
31 extern int Threads_SetFaultHandler(Uint Handler);
34 int Syscall_ValidString(Uint Addr);
35 int Syscall_Valid(int Size, Uint Addr);
38 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
39 void SyscallHandler(tSyscallRegs *Regs)
43 int callNum = Regs->Num;
46 if(callNum != SYS_READ && callNum != SYS_WRITE) {
48 ENTER("iThread iNum", Threads_GetTID(), callNum);
49 if(callNum < NUM_SYSCALLS)
50 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
51 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
58 // -- Exit the current thread
59 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
61 // -- Put the current thread to sleep
62 case SYS_SLEEP: Threads_Sleep(); break;
64 // -- Yield current timeslice
65 case SYS_YIELD: Threads_Yield(); break;
67 // -- Set Error Handler
68 case SYS_SETFAULTHANDLER:
69 Threads_SetFaultHandler(Regs->Arg1);
72 // -- Clone the current thread
74 // Call clone system call
75 ret = Proc_Clone(&err, Regs->Arg1);
76 // Change user stack if a new stack address is passed
77 if(ret == 0 && Regs->Arg2)
78 Regs->StackPointer = Regs->Arg2;
87 // -- Wait for a thread
89 // Sanity Check (Status can be NULL)
90 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
92 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
95 // -- Get the physical address of a page
97 ret = MM_GetPhysAddr(Regs->Arg1);
101 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
103 // -- Allocate an address
104 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
106 // -- Unmap an address
107 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
109 // -- Get Thread/Process IDs
110 case SYS_GETTID: ret = Threads_GetTID(); break;
111 case SYS_GETPID: ret = Threads_GetPID(); break;
113 // -- Get User/Group IDs
114 case SYS_GETUID: ret = Threads_GetUID(); break;
115 case SYS_GETGID: ret = Threads_GetGID(); break;
117 // -- Set User/Group IDs
118 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
119 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
123 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
124 // Destination, Size, *Data
125 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
127 // -- Check for messages
129 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
130 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
131 err = -EINVAL; ret = -1; break;
134 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
137 // -- Get the current timestamp
142 // -- Set the thread's name
144 CHECK_STR_NONULL(Regs->Arg1);
145 Threads_SetName( (char*)Regs->Arg1 );
151 // -- Replace the current process with another
153 CHECK_STR_NONULL(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] );
166 // - EnvP can be NULL
169 tmp = (char**)Regs->Arg3;
170 //Log("tmp = %p", tmp);
171 for(i=0;tmp[i];i++) {
172 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
173 CHECK_STR_NONULL( tmp[i] );
177 LEAVE('s', "Assuming 0");
178 // Path, **Argv, **Envp
179 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
181 // -- Load a binary into the current process
183 if( !Syscall_ValidString(Regs->Arg1)
184 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
190 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
194 // Virtual Filesystem
197 if( !Syscall_ValidString(Regs->Arg1) ) {
202 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
203 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
207 LOG("VFS_Close(%i)", Regs->Arg1);
208 VFS_Close( Regs->Arg1 );
213 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
215 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
220 ret = VFS_Tell( Regs->Arg1 );
224 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
225 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
229 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
230 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
234 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
236 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
241 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
246 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
251 if( !Syscall_Valid(8, Regs->Arg2) ) {
256 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
259 // Open a file that is a entry in an open directory
261 if( !Syscall_ValidString(Regs->Arg2) ) {
266 ret = VFS_OpenChild( &err, Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
271 if( !Syscall_ValidString(Regs->Arg1) ) {
276 ret = VFS_ChDir( (void*)Regs->Arg1 );
281 // All sanity checking should be done by the driver
282 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
285 // Mount a filesystem
287 // Only root can mount filesystems
288 if(Threads_GetUID() != 0) {
293 // Sanity check the paths
294 if(!Syscall_ValidString(Regs->Arg1)
295 || !Syscall_ValidString(Regs->Arg2)
296 || !Syscall_ValidString(Regs->Arg3)
297 || !Syscall_ValidString(Regs->Arg4) ) {
303 (char*)Regs->Arg1, // Device
304 (char*)Regs->Arg2, // Mount point
305 (char*)Regs->Arg3, // Filesystem
306 (char*)Regs->Arg4 // Options
313 Log((char*)Regs->Arg1,
314 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
318 // -- Default (Return Error)
320 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
321 if(Regs->Num < NUM_SYSCALLS)
322 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
329 LOG("ID: %i, Return errno = %i", Regs->Num, err);
333 Regs->Return = ret&0xFFFFFFFF;
334 Regs->RetHi = ret >> 32;
341 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
343 LOG("err = %i", err);
344 if(Regs->Num != SYS_EXECVE)
347 LOG("Actual %i", ret);
355 * \fn int Syscall_ValidString(Uint Addr)
356 * \brief Checks if a memory address contains a valid string
358 int Syscall_ValidString(Uint Addr)
360 // Check if the memory is user memory
361 if(!MM_IsUser(Addr)) return 0;
363 return CheckString( (char*)Addr );
367 * \fn int Syscall_Valid(int Size, Uint Addr)
368 * \brief Checks if a memory address is valid
370 int Syscall_Valid(int Size, Uint Addr)
372 if(!MM_IsUser(Addr)) return 0;
374 return CheckMem( (void*)Addr, Size );