2 * AcessOS Microkernel Version
14 #define CHECK_NUM_NULLOK(v,size) \
15 if((v)&&!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
16 #define CHECK_STR_NULLOK(v) \
17 if((v)&&!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
18 #define CHECK_NUM_NONULL(v,size) \
19 if(!(v)||!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
20 #define CHECK_STR_NONULL(v) \
21 if(!(v)||!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
24 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
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);
71 // Change user stack if a new stack address is passed
72 if(ret == 0 && Regs->Arg2)
73 Regs->StackPointer = Regs->Arg2;
82 // -- Wait for a thread
84 // Sanity Check (Status can be NULL)
85 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
87 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
90 // -- Get the physical address of a page
92 ret = MM_GetPhysAddr(Regs->Arg1);
96 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
98 // -- Allocate an address
99 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
101 // -- Unmap an address
102 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
104 // -- Get Thread/Process IDs
105 case SYS_GETTID: ret = Threads_GetTID(); break;
106 case SYS_GETPID: ret = Threads_GetPID(); break;
108 // -- Get User/Group IDs
109 case SYS_GETUID: ret = Threads_GetUID(); break;
110 case SYS_GETGID: ret = Threads_GetGID(); break;
112 // -- Set User/Group IDs
113 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
114 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
118 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
119 // Destination, Size, *Data
120 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
122 // -- Check for messages
124 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
125 // NOTE: Can't do range checking as we don't know the size
126 // - Should be done by Proc_GetMessage
127 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
128 err = -EINVAL; ret = -1; break;
131 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
134 // -- Get the current timestamp
139 // -- Set the thread's name
141 CHECK_STR_NONULL( (char*) Regs->Arg1);
142 Threads_SetName( (char*)Regs->Arg1 );
148 // -- Replace the current process with another
150 CHECK_STR_NONULL((char*)Regs->Arg1);
151 // Check the argument arrays
154 char **tmp = (char**)Regs->Arg2;
155 // Check ArgV (traverse array checking all string pointers)
156 CHECK_NUM_NONULL( tmp, sizeof(char**) );
157 //Log("tmp = %p", tmp);
158 for(i=0;tmp[i];i++) {
159 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
160 CHECK_STR_NONULL( tmp[i] );
163 // - EnvP can be NULL
166 tmp = (char**)Regs->Arg3;
167 //Log("tmp = %p", tmp);
168 for(i=0;tmp[i];i++) {
169 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
170 CHECK_STR_NONULL( tmp[i] );
174 LEAVE('s', "Assuming 0");
175 // Path, **Argv, **Envp
176 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
178 // -- Load a binary into the current process
180 if( !Syscall_ValidString( (char*) Regs->Arg1)
181 || !Syscall_Valid(sizeof(Uint), (Uint*)Regs->Arg2) ) {
187 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
191 // Virtual Filesystem
194 CHECK_STR_NONULL( (char*)Regs->Arg1 );
195 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
196 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
200 LOG("VFS_Close(%i)", Regs->Arg1);
201 VFS_Close( Regs->Arg1 );
206 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
208 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
213 ret = VFS_Tell( Regs->Arg1 );
217 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
218 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
222 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
223 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
227 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
229 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
234 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
235 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
240 // TODO: What if the filename is longer?
241 // Maybe force it to be a 256 byte buffer
242 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
243 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
246 // Open a file that is a entry in an open directory
248 CHECK_STR_NONULL( (char*)Regs->Arg2 );
249 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
254 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
255 ret = VFS_ChDir( (const char*)Regs->Arg1 );
260 // All sanity checking should be done by the driver
261 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
262 err = -EINVAL; ret = -1; break;
264 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
267 // Mount a filesystem
269 // Only root can mount filesystems
270 if(Threads_GetUID() != 0) {
275 // Sanity check the paths
276 if(!Syscall_ValidString((char*)Regs->Arg1)
277 || !Syscall_ValidString((char*)Regs->Arg2)
278 || !Syscall_ValidString((char*)Regs->Arg3)
279 || !Syscall_ValidString((char*)Regs->Arg4) ) {
285 (char*)Regs->Arg1, // Device
286 (char*)Regs->Arg2, // Mount point
287 (char*)Regs->Arg3, // Filesystem
288 (char*)Regs->Arg4 // Options
292 // Wait on a set of handles
295 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
296 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
297 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
298 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
306 Regs->Arg1, // Max handle
307 (fd_set *)Regs->Arg2, // Read
308 (fd_set *)Regs->Arg3, // Write
309 (fd_set *)Regs->Arg4, // Errors
310 (tTime *)Regs->Arg5, // Timeout
318 LogF("Log: [%i] ", Threads_GetTID());
319 LogF((char*)Regs->Arg1,
320 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
325 // -- Default (Return Error)
327 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
328 if(Regs->Num < NUM_SYSCALLS)
329 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
335 if(err == 0) err = errno;
338 LOG("ID: %i, Return errno = %i", Regs->Num, err);
342 Regs->Return = ret&0xFFFFFFFF;
343 Regs->RetHi = ret >> 32;
350 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
352 LOG("err = %i", err);
353 if(Regs->Num != SYS_EXECVE)
356 LOG("Actual %i", ret);
364 * \fn int Syscall_ValidString(const char *Addr)
365 * \brief Checks if a memory address contains a valid string
367 int Syscall_ValidString(const char *Addr)
369 // Check if the memory is user memory
370 if(!MM_IsUser( (tVAddr) Addr)) return 0;
372 return CheckString( Addr );
376 * \fn int Syscall_Valid(int Size, const void *Addr)
377 * \brief Checks if a memory address is valid
379 int Syscall_Valid(int Size, const void *Addr)
381 if(!MM_IsUser( (tVAddr)Addr )) return 0;
383 return CheckMem( Addr, Size );