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;}
23 #define CHECK_STR_ARRAY(arr) do {\
25 char **tmp = (char**)arr; \
26 CHECK_NUM_NONULL( tmp, sizeof(char**) ); \
27 for(i=0;tmp[i];i++) { \
28 CHECK_STR_NONULL( tmp[i] ); \
29 CHECK_NUM_NONULL( &tmp[i+1], sizeof(char*) ); \
35 extern Uint Binary_Load(const char *file, Uint *entryPoint);
38 void SyscallHandler(tSyscallRegs *Regs);
39 int Syscall_ValidString(const char *Addr);
40 int Syscall_Valid(int Size, const void *Addr);
43 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
44 void SyscallHandler(tSyscallRegs *Regs)
48 int callNum = Regs->Num;
51 if(callNum != SYS_READ && callNum != SYS_WRITE) {
53 ENTER("iThread iNum", Threads_GetTID(), callNum);
54 if(callNum < NUM_SYSCALLS)
55 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
56 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
63 // -- Exit the current thread
64 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
66 // -- Put the current thread to sleep
67 case SYS_SLEEP: Threads_Sleep(); break;
69 // -- Yield current timeslice
70 case SYS_YIELD: Threads_Yield(); break;
72 // -- Set Error Handler
73 case SYS_SETFAULTHANDLER:
74 Threads_SetFaultHandler(Regs->Arg1);
77 // -- Clone the current thread
79 // Call clone system call
80 ret = Proc_Clone(Regs->Arg1);
89 // -- Wait fr an event
92 ret = Threads_WaitEvents(Regs->Arg1);
95 // -- Wait for a thread
97 // Sanity Check (Status can be NULL)
98 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
100 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
103 // -- Get the physical address of a page
105 ret = MM_GetPhysAddr(Regs->Arg1);
109 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
111 // -- Allocate an address
112 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
114 // -- Unmap an address
115 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
117 // -- Get Thread/Process IDs
118 case SYS_GETTID: ret = Threads_GetTID(); break;
119 case SYS_GETPID: ret = Threads_GetPID(); break;
121 // -- Get User/Group IDs
122 case SYS_GETUID: ret = Threads_GetUID(); break;
123 case SYS_GETGID: ret = Threads_GetGID(); break;
125 // -- Set User/Group IDs
126 case SYS_SETUID: ret = Threads_SetUID(Regs->Arg1); break;
127 case SYS_SETGID: ret = Threads_SetGID(Regs->Arg1); break;
131 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
132 // Destination, Size, *Data
133 ret = Proc_SendMessage(Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
135 // -- Check for messages
137 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
138 // NOTE: Can't do range checking as we don't know the size
139 // - Should be done by Proc_GetMessage
140 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
141 err = -EINVAL; ret = -1; break;
144 ret = Proc_GetMessage((Uint*)Regs->Arg1, (void*)Regs->Arg2);
147 // -- Get the current timestamp
152 // -- Set the thread's name
154 CHECK_STR_NONULL( (char*) Regs->Arg1);
155 Threads_SetName( (char*)Regs->Arg1 );
161 // -- Create a new process
163 CHECK_STR_NONULL((const char*)Regs->Arg1);
164 CHECK_STR_ARRAY((const char**)Regs->Arg2);
165 CHECK_STR_ARRAY((const char**)Regs->Arg3);
166 CHECK_NUM_NONULL((void*)Regs->Arg5, Regs->Arg4*sizeof(int));
168 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
169 Regs->Arg4, (int*)Regs->Arg5
172 // -- Replace the current process with another
174 CHECK_STR_NONULL((char*)Regs->Arg1);
175 CHECK_STR_ARRAY( (char**)Regs->Arg2 );
177 CHECK_STR_ARRAY( (char**)Regs->Arg3 );
178 LEAVE('s', "Assuming 0");
179 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
181 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
185 // -- Load a binary into the current process
187 CHECK_STR_NONULL( (char*)Regs->Arg1 );
188 CHECK_NUM_NONULL( (Uint*)Regs->Arg2, sizeof(Uint) );
190 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
194 // Virtual Filesystem
197 CHECK_STR_NONULL( (char*)Regs->Arg1 );
198 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
199 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
203 LOG("VFS_Close(%i)", Regs->Arg1);
204 VFS_Close( Regs->Arg1 );
209 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
211 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
216 ret = VFS_Tell( Regs->Arg1 );
220 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
221 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
225 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
226 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
230 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
232 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
237 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
238 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
243 // TODO: What if the filename is longer?
244 // Maybe force it to be a 256 byte buffer
245 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
246 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
249 // Open a file that is a entry in an open directory
251 CHECK_STR_NONULL( (char*)Regs->Arg2 );
252 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
257 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
258 ret = VFS_ChDir( (const char*)Regs->Arg1 );
263 // All sanity checking should be done by the driver
264 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
265 err = -EINVAL; ret = -1; break;
267 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
270 // Mount a filesystem
272 // Only root can mount filesystems
273 if(Threads_GetUID() != 0) {
278 // Sanity check the paths
279 if(!Syscall_ValidString((char*)Regs->Arg1)
280 || !Syscall_ValidString((char*)Regs->Arg2)
281 || !Syscall_ValidString((char*)Regs->Arg3)
282 || !Syscall_ValidString((char*)Regs->Arg4) ) {
288 (char*)Regs->Arg1, // Device
289 (char*)Regs->Arg2, // Mount point
290 (char*)Regs->Arg3, // Filesystem
291 (char*)Regs->Arg4 // Options
295 // Wait on a set of handles
298 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
299 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
300 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
301 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
309 Regs->Arg1, // Max handle
310 (fd_set *)Regs->Arg2, // Read
311 (fd_set *)Regs->Arg3, // Write
312 (fd_set *)Regs->Arg4, // Errors
313 (tTime *)Regs->Arg5, // Timeout
314 (Uint32)Regs->Arg6, // Extra wakeup events
322 CHECK_STR_NONULL( (char*)Regs->Arg1 );
323 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
324 LogF((const char*)Regs->Arg1,
325 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
330 // -- Default (Return Error)
332 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
333 if(Regs->Num < NUM_SYSCALLS)
334 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
340 if(err == 0) err = errno;
343 LOG("ID: %i, Return errno = %i", Regs->Num, err);
347 Regs->Return = ret&0xFFFFFFFF;
348 Regs->RetHi = ret >> 32;
355 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
357 LOG("err = %i", err);
358 if( callNum == SYS_EXECVE )
359 LOG("Actual %i", ret);
369 * \fn int Syscall_ValidString(const char *Addr)
370 * \brief Checks if a memory address contains a valid string
372 int Syscall_ValidString(const char *Addr)
374 // Check if the memory is user memory
375 if(!MM_IsUser( (tVAddr) Addr)) return 0;
377 return CheckString( Addr );
381 * \fn int Syscall_Valid(int Size, const void *Addr)
382 * \brief Checks if a memory address is valid
384 int Syscall_Valid(int Size, const void *Addr)
386 if(!MM_IsUser( (tVAddr)Addr )) return 0;
388 return CheckMem( Addr, Size );