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_GetPID();
30 extern int Threads_GetTID();
31 extern tUID Threads_GetUID();
32 extern int Threads_SetUID(Uint *errno, tUID ID);
33 extern tGID Threads_GetGID();
34 extern int Threads_SetGID(Uint *errno, tGID ID);
37 int Syscall_ValidString(Uint Addr);
38 int Syscall_Valid(int Size, Uint Addr);
41 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
42 void SyscallHandler(tSyscallRegs *Regs)
47 ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
48 if(Regs->Num < NUM_SYSCALLS)
49 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
50 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
54 // -- Exit the current thread
55 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
57 // -- Put the current thread to sleep
58 case SYS_SLEEP: Threads_Sleep(); break;
60 // -- Yield current timeslice
61 case SYS_YIELD: Threads_Yield(); break;
63 // -- Clone the current thread
65 // Call clone system call
66 ret = Proc_Clone(&err, Regs->Arg1);
67 // Change user stack if a new stack address is passed
68 if(ret == 0 && Regs->Arg2)
69 Regs->StackPointer = Regs->Arg2;
78 // -- Wait for a thread
80 // Sanity Check (Status can be NULL)
81 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
83 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
86 // -- Get the physical address of a page
88 ret = MM_GetPhysAddr(Regs->Arg1);
92 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
94 // -- Allocate an address
95 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
97 // -- Unmap an address
98 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
100 // -- Get Thread/Process IDs
101 case SYS_GETTID: ret = Threads_GetTID(); break;
102 case SYS_GETPID: ret = Threads_GetPID(); break;
104 // -- Get User/Group IDs
105 case SYS_GETUID: ret = Threads_GetUID(); break;
106 case SYS_GETGID: ret = Threads_GetGID(); break;
108 // -- Set User/Group IDs
109 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
110 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
114 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
115 // Destination, Size, *Data
116 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
118 // -- Check for messages
120 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
121 //NOTE: Uncertain due to length being unknown
122 // (Proc_GetMessage should check itself)
123 CHECK_NUM_NULLOK(Regs->Arg2, sizeof(Uint)*4);
125 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
128 // -- Set the thread's name
130 CHECK_STR_NONULL(Regs->Arg1);
131 Threads_SetName( (char*)Regs->Arg1 );
138 CHECK_STR_NONULL(Regs->Arg1);
139 //Log(" Regs = {Arg2: %x, Arg3: %x}", Regs->Arg2, Regs->Arg3);
142 char **tmp = (char**)Regs->Arg2;
143 // Check ArgV (traverse array checking all string pointers)
144 CHECK_NUM_NONULL( tmp, sizeof(char**) );
145 //Log("tmp = %p", tmp);
146 for(i=0;tmp[i];i++) {
147 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
148 CHECK_STR_NONULL( tmp[i] );
151 // - EnvP can be NULL
154 tmp = (char**)Regs->Arg3;
155 //Log("tmp = %p", tmp);
156 for(i=0;tmp[i];i++) {
157 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
158 CHECK_STR_NONULL( tmp[i] );
162 LEAVE('s', "Assuming 0");
163 // Path, **Argv, **Envp
164 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
167 if( !Syscall_ValidString(Regs->Arg1)
168 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
174 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
178 // Virtual Filesystem
181 if( !Syscall_ValidString(Regs->Arg1) ) {
186 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
190 VFS_Close( Regs->Arg1 );
194 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
198 ret = VFS_Tell( Regs->Arg1 );
202 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
203 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
207 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
208 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
212 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
214 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
219 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
224 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
229 if( !Syscall_Valid(8, Regs->Arg2) ) {
234 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
239 if( !Syscall_ValidString(Regs->Arg1) ) {
244 ret = VFS_ChDir( (void*)Regs->Arg1 );
249 // All sanity checking should be done by the driver
250 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
253 // Mount a filesystem
255 // Only root can mount filesystems
256 if(Threads_GetUID() != 0) {
261 // Sanity check the paths
262 if(!Syscall_ValidString(Regs->Arg1)
263 || !Syscall_ValidString(Regs->Arg2)
264 || !Syscall_ValidString(Regs->Arg3)
265 || !Syscall_ValidString(Regs->Arg4) ) {
271 (char*)Regs->Arg1, // Device
272 (char*)Regs->Arg2, // Mount point
273 (char*)Regs->Arg3, // Filesystem
274 (char*)Regs->Arg4 // Options
281 Log((char*)Regs->Arg1,
282 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
286 // -- Default (Return Error)
288 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
289 if(Regs->Num < NUM_SYSCALLS)
290 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
297 LOG("ID: %i, Return errno = %i", Regs->Num, err);
301 Regs->Return = ret&0xFFFFFFFF;
302 Regs->RetHi = ret >> 32;
308 LOG("err = %i", err);
309 if(Regs->Num != SYS_EXECVE)
312 LOG("Actual %i", ret);
317 * \fn int Syscall_ValidString(Uint Addr)
318 * \brief Checks if a memory address contains a valid string
320 int Syscall_ValidString(Uint Addr)
322 // Check if the memory is user memory
323 if(!MM_IsUser(Addr)) return 0;
325 return CheckString( (char*)Addr );
329 * \fn int Syscall_Valid(int Size, Uint Addr)
330 * \brief Checks if a memory address is valid
332 int Syscall_Valid(int Size, Uint Addr)
334 if(!MM_IsUser(Addr)) return 0;
336 return CheckMem( (void*)Addr, Size );