2 * AcessOS Microkernel Version
12 #define CHECK_NUM_NULLOK(v,size) do {\
13 if((v)&&!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}\
15 #define CHECK_STR_NULLOK(v) do {\
16 if((v)&&!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}\
18 #define CHECK_NUM_NONULL(v,size) do {\
19 if(!(v)||!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}\
21 #define CHECK_STR_NONULL(v) do {\
22 if(!(v)||!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}\
26 extern int Proc_Clone(Uint *Err, Uint Flags);
27 extern int Threads_WaitTID(int TID, int *status);
28 extern Uint Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
29 extern int Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
30 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
31 extern Uint Binary_Load(char *file, Uint *entryPoint);
32 extern int VFS_FInfo(int FD, void *Dest, int MaxACLs);
33 extern int VFS_GetACL(int FD, void *Dest);
34 extern int VFS_ChDir(char *Dest);
35 extern int Threads_SetName(char *NewName);
36 extern int Threads_GetPID();
37 extern int Threads_GetTID();
38 extern int Threads_GetUID();
39 extern int Threads_GetGID();
42 int Syscall_ValidString(Uint Addr);
43 int Syscall_Valid(int Size, Uint Addr);
46 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
47 void SyscallHandler(tSyscallRegs *Regs)
52 ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
53 if(Regs->Num < NUM_SYSCALLS)
54 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
55 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3);
60 // -- Exit the current thread
61 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
63 // -- Put the current thread to sleep
64 case SYS_SLEEP: Threads_Sleep(); break;
66 // -- Yield current timeslice
67 case SYS_YIELD: Threads_Yield(); break;
69 // -- Clone the current thread
71 // Call clone system call
72 ret = Proc_Clone(&err, Regs->Arg1);
73 // Change user stack if a new stack address is passed
74 if(ret == 0 && Regs->Arg2)
75 Regs->StackPointer = Regs->Arg2;
84 // -- Wait for a thread
86 // Sanity Check (Status can be NULL)
87 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
89 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
92 // -- Get the physical address of a page
94 ret = MM_GetPhysAddr(Regs->Arg1);
98 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
100 // -- Allocate an address
101 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
103 // -- Unmap an address
104 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
106 // -- Get Thread/Process IDs
107 case SYS_GETTID: ret = Threads_GetTID(); break;
108 case SYS_GETPID: ret = Threads_GetPID(); break;
110 // -- Get User/Group IDs
111 case SYS_GETUID: ret = Threads_GetUID(); break;
112 case SYS_GETGID: ret = Threads_GetGID(); break;
114 // -- Set User/Group IDs
115 case SYS_SETUID: Log("Setting User ID to %i", Regs->Arg1); break;
116 case SYS_SETGID: Log("Setting Group ID to %i", Regs->Arg1); break;
120 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
121 // Destination, Size, *Data
122 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
124 // -- Check for messages
126 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
127 //NOTE: Uncertain due to length being unknown
128 // (Proc_GetMessage should check itself)
129 CHECK_NUM_NULLOK(Regs->Arg2, sizeof(Uint)*4);
131 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
134 // -- Set the thread's name
136 CHECK_STR_NONULL(Regs->Arg1);
137 Threads_SetName( (char*)Regs->Arg1 );
144 CHECK_STR_NONULL(Regs->Arg1);
147 char **tmp = (char**)Regs->Arg2;
148 // Check ArgV (traverse array checking all string pointers)
149 CHECK_NUM_NONULL( tmp, sizeof(char**) );
150 for(i=0;tmp[i];i++) {
151 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
152 CHECK_STR_NONULL( tmp[i] );
155 // - EnvP can be NULL
158 tmp = (char**)Regs->Arg3;
159 for(i=0;tmp[i];i++) {
160 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
161 CHECK_STR_NONULL( tmp[i] );
165 // Path, **Argv, **Envp
166 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
169 if( !Syscall_ValidString(Regs->Arg1)
170 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
176 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
180 // Virtual Filesystem
183 if( !Syscall_ValidString(Regs->Arg1) ) {
188 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
192 VFS_Close( Regs->Arg1 );
196 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
200 ret = VFS_Tell( Regs->Arg1 );
204 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
205 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
209 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
210 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
214 CHECK_NUM_NONULL( Regs->Arg2, sizeof(struct s_sysFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
216 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
221 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
226 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
231 if( !Syscall_Valid(8, Regs->Arg2) ) {
236 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
241 if( !Syscall_ValidString(Regs->Arg1) ) {
246 ret = VFS_ChDir( (void*)Regs->Arg1 );
251 // All sanity checking should be done by the driver
252 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
255 // Mount a filesystem
257 // Only root can mount filesystems
258 if(Threads_GetUID() != 0) {
263 // Sanity check the paths
264 if(!Syscall_ValidString(Regs->Arg1)
265 || !Syscall_ValidString(Regs->Arg2)
266 || !Syscall_ValidString(Regs->Arg3)
267 || !Syscall_ValidString(Regs->Arg4) ) {
273 (char*)Regs->Arg1, // Device
274 (char*)Regs->Arg2, // Mount point
275 (char*)Regs->Arg3, // Filesystem
276 (char*)Regs->Arg4 // Options
283 Log((char*)Regs->Arg1,
284 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
288 // -- Default (Return Error)
290 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
291 if(Regs->Num < NUM_SYSCALLS)
292 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
298 Regs->Return = ret&0xFFFFFFFF;
299 Regs->RetHi = ret >> 32;
305 LOG("err = %i", err);
311 * \fn int Syscall_ValidString(Uint Addr)
312 * \brief Checks if a memory address contains a valid string
314 int Syscall_ValidString(Uint Addr)
316 // Check if the memory is user memory
317 if(!MM_IsUser(Addr)) return 0;
319 return CheckString( (char*)Addr );
323 * \fn int Syscall_Valid(int Size, Uint Addr)
324 * \brief Checks if a memory address is valid
326 int Syscall_Valid(int Size, Uint Addr)
328 if(!MM_IsUser(Addr)) return 0;
330 return CheckMem( (void*)Addr, Size );