2 * AcessOS Microkernel Version
15 #define CHECK_NUM_NULLOK(v,size) \
16 if((v)&&!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
17 #define CHECK_STR_NULLOK(v) \
18 if((v)&&!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
19 #define CHECK_NUM_NONULL(v,size) \
20 if(!(v)||!Syscall_Valid((size),(v))){ret=-1;err=-EINVAL;break;}
21 #define CHECK_STR_NONULL(v) \
22 if(!(v)||!Syscall_ValidString((v))){ret=-1;err=-EINVAL;break;}
25 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
26 extern Uint Binary_Load(const char *file, Uint *entryPoint);
29 void SyscallHandler(tSyscallRegs *Regs);
30 int Syscall_ValidString(const char *Addr);
31 int Syscall_Valid(int Size, const void *Addr);
34 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
35 void SyscallHandler(tSyscallRegs *Regs)
39 int callNum = Regs->Num;
42 if(callNum != SYS_READ && callNum != SYS_WRITE) {
44 ENTER("iThread iNum", Threads_GetTID(), callNum);
45 if(callNum < NUM_SYSCALLS)
46 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
47 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 // -- Set Error Handler
64 case SYS_SETFAULTHANDLER:
65 Threads_SetFaultHandler(Regs->Arg1);
68 // -- Clone the current thread
70 // Call clone system call
71 ret = Proc_Clone(Regs->Arg1);
80 // -- Wait fr an event
83 ret = Threads_WaitEvents(Regs->Arg1);
86 // -- Wait for a thread
88 // Sanity Check (Status can be NULL)
89 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
91 ret = Threads_WaitTID(Regs->Arg1, (int*)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( (void*)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( (Uint*)Regs->Arg1, sizeof(Uint) );
129 // NOTE: Can't do range checking as we don't know the size
130 // - Should be done by Proc_GetMessage
131 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
132 err = -EINVAL; ret = -1; break;
135 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
138 // -- Get the current timestamp
143 // -- Set the thread's name
145 CHECK_STR_NONULL( (char*) Regs->Arg1);
146 Threads_SetName( (char*)Regs->Arg1 );
152 // -- Replace the current process with another
154 CHECK_STR_NONULL((char*)Regs->Arg1);
155 // Check the argument arrays
158 char **tmp = (char**)Regs->Arg2;
159 // Check ArgV (traverse array checking all string pointers)
160 CHECK_NUM_NONULL( tmp, sizeof(char**) );
161 //Log("tmp = %p", tmp);
162 for(i=0;tmp[i];i++) {
163 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
164 CHECK_STR_NONULL( tmp[i] );
168 // - EnvP can be NULL
171 tmp = (char**)Regs->Arg3;
172 CHECK_NUM_NONULL(tmp, sizeof(char**));
173 for(i=0;tmp[i];i++) {
174 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
175 CHECK_STR_NONULL( tmp[i] );
180 LEAVE('s', "Assuming 0");
181 // Path, **Argv, **Envp
182 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
184 // -- Load a binary into the current process
186 if( !Syscall_ValidString( (char*) Regs->Arg1)
187 || !Syscall_Valid(sizeof(Uint), (Uint*)Regs->Arg2) ) {
193 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
197 // Virtual Filesystem
200 CHECK_STR_NONULL( (char*)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( (void*)Regs->Arg2, Regs->Arg3 );
224 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
228 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
229 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
233 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
235 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
240 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
241 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
246 // TODO: What if the filename is longer?
247 // Maybe force it to be a 256 byte buffer
248 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
249 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
252 // Open a file that is a entry in an open directory
254 CHECK_STR_NONULL( (char*)Regs->Arg2 );
255 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
260 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
261 ret = VFS_ChDir( (const char*)Regs->Arg1 );
266 // All sanity checking should be done by the driver
267 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
268 err = -EINVAL; ret = -1; break;
270 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
273 // Mount a filesystem
275 // Only root can mount filesystems
276 if(Threads_GetUID() != 0) {
281 // Sanity check the paths
282 if(!Syscall_ValidString((char*)Regs->Arg1)
283 || !Syscall_ValidString((char*)Regs->Arg2)
284 || !Syscall_ValidString((char*)Regs->Arg3)
285 || !Syscall_ValidString((char*)Regs->Arg4) ) {
291 (char*)Regs->Arg1, // Device
292 (char*)Regs->Arg2, // Mount point
293 (char*)Regs->Arg3, // Filesystem
294 (char*)Regs->Arg4 // Options
298 // Wait on a set of handles
301 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
302 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
303 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
304 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
312 Regs->Arg1, // Max handle
313 (fd_set *)Regs->Arg2, // Read
314 (fd_set *)Regs->Arg3, // Write
315 (fd_set *)Regs->Arg4, // Errors
316 (tTime *)Regs->Arg5, // Timeout
317 (Uint32)Regs->Arg6, // Extra wakeup events
325 CHECK_STR_NONULL( (char*)Regs->Arg1 );
326 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
327 LogF((const char*)Regs->Arg1,
328 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
333 // -- Default (Return Error)
335 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
336 if(Regs->Num < NUM_SYSCALLS)
337 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
343 if(err == 0) err = errno;
346 LOG("ID: %i, Return errno = %i", Regs->Num, err);
350 Regs->Return = ret&0xFFFFFFFF;
351 Regs->RetHi = ret >> 32;
358 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
360 LOG("err = %i", err);
361 if( callNum == SYS_EXECVE )
362 LOG("Actual %i", ret);
372 * \fn int Syscall_ValidString(const char *Addr)
373 * \brief Checks if a memory address contains a valid string
375 int Syscall_ValidString(const char *Addr)
377 // Check if the memory is user memory
378 if(!MM_IsUser( (tVAddr) Addr)) return 0;
380 return CheckString( Addr );
384 * \fn int Syscall_Valid(int Size, const void *Addr)
385 * \brief Checks if a memory address is valid
387 int Syscall_Valid(int Size, const void *Addr)
389 if(!MM_IsUser( (tVAddr)Addr )) return 0;
391 return CheckMem( Addr, Size );