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( (void*)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 if( Regs->Arg3 != -1 )
139 CHECK_NUM_NULLOK((void*)Regs->Arg3, Regs->Arg2);
141 ret = Proc_GetMessage((Uint*)Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
144 // -- Get the current timestamp
149 // -- Set the thread's name
151 CHECK_STR_NONULL( (char*) Regs->Arg1);
152 Threads_SetName( (char*)Regs->Arg1 );
158 // -- Create a new process
160 CHECK_STR_NONULL((const char*)Regs->Arg1);
161 CHECK_STR_ARRAY((const char**)Regs->Arg2);
162 CHECK_STR_ARRAY((const char**)Regs->Arg3);
163 CHECK_NUM_NONULL((void*)Regs->Arg5, Regs->Arg4*sizeof(int));
165 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
166 Regs->Arg4, (int*)Regs->Arg5
169 // -- Replace the current process with another
171 CHECK_STR_NONULL((char*)Regs->Arg1);
172 CHECK_STR_ARRAY( (char**)Regs->Arg2 );
174 CHECK_STR_ARRAY( (char**)Regs->Arg3 );
175 LEAVE('s', "Assuming 0");
176 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
178 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
182 // -- Load a binary into the current process
184 CHECK_STR_NONULL( (char*)Regs->Arg1 );
185 CHECK_NUM_NONULL( (Uint*)Regs->Arg2, sizeof(Uint) );
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 | VFS_OPENFLAG_USER);
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) {
278 if( !Syscall_ValidString((char*)Regs->Arg2) ) {
284 ret = VFS_Unmount((char*)Regs->Arg2);
288 // Sanity check the paths
289 if(!Syscall_ValidString((char*)Regs->Arg1)
290 || !Syscall_ValidString((char*)Regs->Arg2)
291 || (Regs->Arg3 && !Syscall_ValidString((char*)Regs->Arg3))
292 || !Syscall_ValidString((char*)Regs->Arg4) ) {
298 (char*)Regs->Arg1, // Device
299 (char*)Regs->Arg2, // Mount point
300 (char*)Regs->Arg3, // Filesystem
301 (char*)Regs->Arg4 // Options
306 // Wait on a set of handles
309 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
310 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
311 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
312 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
320 Regs->Arg1, // Max handle
321 (fd_set *)Regs->Arg2, // Read
322 (fd_set *)Regs->Arg3, // Write
323 (fd_set *)Regs->Arg4, // Errors
324 (tTime *)Regs->Arg5, // Timeout
325 (Uint32)Regs->Arg6, // Extra wakeup events
333 CHECK_STR_NONULL( (char*)Regs->Arg1 );
334 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
335 LogF((const char*)Regs->Arg1,
336 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
341 // -- Default (Return Error)
343 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
344 if(Regs->Num < NUM_SYSCALLS)
345 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
351 if(err == 0) err = errno;
354 LOG("ID: %i, Return errno = %i", Regs->Num, err);
358 Regs->Return = ret&0xFFFFFFFF;
359 Regs->RetHi = ret >> 32;
366 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
368 LOG("err = %i", err);
369 if( callNum == SYS_EXECVE )
370 LOG("Actual %i", ret);
380 * \fn int Syscall_ValidString(const char *Addr)
381 * \brief Checks if a memory address contains a valid string
383 int Syscall_ValidString(const char *Addr)
385 // Check if the memory is user memory
386 if(!MM_IsUser( (tVAddr) Addr)) return 0;
388 return CheckString( Addr );
392 * \fn int Syscall_Valid(int Size, const void *Addr)
393 * \brief Checks if a memory address is valid
395 int Syscall_Valid(int Size, const void *Addr)
397 if(!MM_IsUser( (tVAddr)Addr )) return 0;
399 return CheckMem( Addr, Size );