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_SetUID(Uint *errno, tUID ID);
29 extern int Threads_SetGID(Uint *errno, tGID ID);
30 extern int Threads_SetFaultHandler(Uint Handler);
33 int Syscall_ValidString(Uint Addr);
34 int Syscall_Valid(int Size, Uint Addr);
37 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
38 void SyscallHandler(tSyscallRegs *Regs)
42 int callNum = Regs->Num;
45 if(callNum != SYS_READ && callNum != SYS_WRITE) {
47 ENTER("iThread iNum", Threads_GetTID(), callNum);
48 if(callNum < NUM_SYSCALLS)
49 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
50 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
57 // -- Exit the current thread
58 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
60 // -- Put the current thread to sleep
61 case SYS_SLEEP: Threads_Sleep(); break;
63 // -- Yield current timeslice
64 case SYS_YIELD: Threads_Yield(); break;
66 // -- Set Error Handler
67 case SYS_SETFAULTHANDLER:
68 Threads_SetFaultHandler(Regs->Arg1);
71 // -- Clone the current thread
73 // Call clone system call
74 ret = Proc_Clone(&err, Regs->Arg1);
75 // Change user stack if a new stack address is passed
76 if(ret == 0 && Regs->Arg2)
77 Regs->StackPointer = Regs->Arg2;
86 // -- Wait for a thread
88 // Sanity Check (Status can be NULL)
89 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
91 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
94 // -- Get the physical address of a page
96 ret = MM_GetPhysAddr(Regs->Arg1);
100 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
102 // -- Allocate an address
103 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
105 // -- Unmap an address
106 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
108 // -- Get Thread/Process IDs
109 case SYS_GETTID: ret = Threads_GetTID(); break;
110 case SYS_GETPID: ret = Threads_GetPID(); break;
112 // -- Get User/Group IDs
113 case SYS_GETUID: ret = Threads_GetUID(); break;
114 case SYS_GETGID: ret = Threads_GetGID(); break;
116 // -- Set User/Group IDs
117 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
118 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
122 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
123 // Destination, Size, *Data
124 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
126 // -- Check for messages
128 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
129 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
130 err = -EINVAL; ret = -1; break;
133 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
136 // -- Get the current timestamp
141 // -- Set the thread's name
143 CHECK_STR_NONULL(Regs->Arg1);
144 Threads_SetName( (char*)Regs->Arg1 );
150 // -- Replace the current process with another
152 CHECK_STR_NONULL(Regs->Arg1);
153 // Check the argument arrays
156 char **tmp = (char**)Regs->Arg2;
157 // Check ArgV (traverse array checking all string pointers)
158 CHECK_NUM_NONULL( tmp, sizeof(char**) );
159 //Log("tmp = %p", tmp);
160 for(i=0;tmp[i];i++) {
161 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
162 CHECK_STR_NONULL( tmp[i] );
165 // - EnvP can be NULL
168 tmp = (char**)Regs->Arg3;
169 //Log("tmp = %p", tmp);
170 for(i=0;tmp[i];i++) {
171 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
172 CHECK_STR_NONULL( tmp[i] );
176 LEAVE('s', "Assuming 0");
177 // Path, **Argv, **Envp
178 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
180 // -- Load a binary into the current process
182 if( !Syscall_ValidString(Regs->Arg1)
183 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
189 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
193 // Virtual Filesystem
196 if( !Syscall_ValidString(Regs->Arg1) ) {
201 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
202 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
206 LOG("VFS_Close(%i)", Regs->Arg1);
207 VFS_Close( Regs->Arg1 );
212 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
214 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
219 ret = VFS_Tell( Regs->Arg1 );
223 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
224 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
228 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
229 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
233 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
235 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
240 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
245 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
250 // TODO: What if the filename is longer?
251 // Maybe force it to be a 256 byte buffer
252 if( !Syscall_Valid(8, Regs->Arg2) ) {
257 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
260 // Open a file that is a entry in an open directory
262 if( !Syscall_ValidString(Regs->Arg2) ) {
267 ret = VFS_OpenChild( &err, Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
272 if( !Syscall_ValidString(Regs->Arg1) ) {
277 ret = VFS_ChDir( (void*)Regs->Arg1 );
282 // All sanity checking should be done by the driver
283 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
286 // Mount a filesystem
288 // Only root can mount filesystems
289 if(Threads_GetUID() != 0) {
294 // Sanity check the paths
295 if(!Syscall_ValidString(Regs->Arg1)
296 || !Syscall_ValidString(Regs->Arg2)
297 || !Syscall_ValidString(Regs->Arg3)
298 || !Syscall_ValidString(Regs->Arg4) ) {
304 (char*)Regs->Arg1, // Device
305 (char*)Regs->Arg2, // Mount point
306 (char*)Regs->Arg3, // Filesystem
307 (char*)Regs->Arg4 // Options
314 LogF("Log: [%i] ", Threads_GetTID());
315 LogF((char*)Regs->Arg1,
316 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
321 // -- Default (Return Error)
323 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
324 if(Regs->Num < NUM_SYSCALLS)
325 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
332 LOG("ID: %i, Return errno = %i", Regs->Num, err);
336 Regs->Return = ret&0xFFFFFFFF;
337 Regs->RetHi = ret >> 32;
344 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
346 LOG("err = %i", err);
347 if(Regs->Num != SYS_EXECVE)
350 LOG("Actual %i", ret);
358 * \fn int Syscall_ValidString(Uint Addr)
359 * \brief Checks if a memory address contains a valid string
361 int Syscall_ValidString(Uint Addr)
363 // Check if the memory is user memory
364 if(!MM_IsUser(Addr)) return 0;
366 return CheckString( (char*)Addr );
370 * \fn int Syscall_Valid(int Size, Uint Addr)
371 * \brief Checks if a memory address is valid
373 int Syscall_Valid(int Size, Uint Addr)
375 if(!MM_IsUser(Addr)) return 0;
377 return CheckMem( (void*)Addr, Size );