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 Log("Proc_Clone returned %i", ret);
72 // Change user stack if a new stack address is passed
73 if(ret == 0 && Regs->Arg2)
74 Regs->StackPointer = Regs->Arg2;
83 // -- Wait for a thread
85 // Sanity Check (Status can be NULL)
86 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
88 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
91 // -- Get the physical address of a page
93 ret = MM_GetPhysAddr(Regs->Arg1);
97 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
99 // -- Allocate an address
100 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
102 // -- Unmap an address
103 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
105 // -- Get Thread/Process IDs
106 case SYS_GETTID: ret = Threads_GetTID(); break;
107 case SYS_GETPID: ret = Threads_GetPID(); break;
109 // -- Get User/Group IDs
110 case SYS_GETUID: ret = Threads_GetUID(); break;
111 case SYS_GETGID: ret = Threads_GetGID(); break;
113 // -- Set User/Group IDs
114 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
115 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
119 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
120 // Destination, Size, *Data
121 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
123 // -- Check for messages
125 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
126 // NOTE: Can't do range checking as we don't know the size
127 // - Should be done by Proc_GetMessage
128 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
129 err = -EINVAL; ret = -1; break;
132 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
135 // -- Get the current timestamp
140 // -- Set the thread's name
142 CHECK_STR_NONULL( (char*) Regs->Arg1);
143 Threads_SetName( (char*)Regs->Arg1 );
149 // -- Replace the current process with another
151 CHECK_STR_NONULL((char*)Regs->Arg1);
152 // Check the argument arrays
155 char **tmp = (char**)Regs->Arg2;
156 // Check ArgV (traverse array checking all string pointers)
157 CHECK_NUM_NONULL( tmp, sizeof(char**) );
158 //Log("tmp = %p", tmp);
159 for(i=0;tmp[i];i++) {
160 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
161 CHECK_STR_NONULL( tmp[i] );
164 // - EnvP can be NULL
167 tmp = (char**)Regs->Arg3;
168 //Log("tmp = %p", tmp);
169 for(i=0;tmp[i];i++) {
170 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
171 CHECK_STR_NONULL( tmp[i] );
175 LEAVE('s', "Assuming 0");
176 // Path, **Argv, **Envp
177 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
179 // -- Load a binary into the current process
181 if( !Syscall_ValidString( (char*) Regs->Arg1)
182 || !Syscall_Valid(sizeof(Uint), (Uint*)Regs->Arg2) ) {
188 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
192 // Virtual Filesystem
195 CHECK_STR_NONULL( (char*)Regs->Arg1 );
196 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
197 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
201 LOG("VFS_Close(%i)", Regs->Arg1);
202 VFS_Close( Regs->Arg1 );
207 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
209 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
214 ret = VFS_Tell( Regs->Arg1 );
218 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
219 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
223 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
224 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
228 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
230 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
235 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
236 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
241 // TODO: What if the filename is longer?
242 // Maybe force it to be a 256 byte buffer
243 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
244 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
247 // Open a file that is a entry in an open directory
249 CHECK_STR_NONULL( (char*)Regs->Arg2 );
250 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
255 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
256 ret = VFS_ChDir( (const char*)Regs->Arg1 );
261 // All sanity checking should be done by the driver
262 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
263 err = -EINVAL; ret = -1; break;
265 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
268 // Mount a filesystem
270 // Only root can mount filesystems
271 if(Threads_GetUID() != 0) {
276 // Sanity check the paths
277 if(!Syscall_ValidString((char*)Regs->Arg1)
278 || !Syscall_ValidString((char*)Regs->Arg2)
279 || !Syscall_ValidString((char*)Regs->Arg3)
280 || !Syscall_ValidString((char*)Regs->Arg4) ) {
286 (char*)Regs->Arg1, // Device
287 (char*)Regs->Arg2, // Mount point
288 (char*)Regs->Arg3, // Filesystem
289 (char*)Regs->Arg4 // Options
293 // Wait on a set of handles
296 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
297 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
298 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
299 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
307 Regs->Arg1, // Max handle
308 (fd_set *)Regs->Arg2, // Read
309 (fd_set *)Regs->Arg3, // Write
310 (fd_set *)Regs->Arg4, // Errors
311 (tTime *)Regs->Arg5, // Timeout
319 LogF("Log: [%i] ", Threads_GetTID());
320 LogF((char*)Regs->Arg1,
321 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
326 // -- Default (Return Error)
328 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
329 if(Regs->Num < NUM_SYSCALLS)
330 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
336 if(err == 0) err = errno;
339 LOG("ID: %i, Return errno = %i", Regs->Num, err);
343 Regs->Return = ret&0xFFFFFFFF;
344 Regs->RetHi = ret >> 32;
351 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
353 LOG("err = %i", err);
354 if( callNum == SYS_EXECVE )
355 LOG("Actual %i", ret);
365 * \fn int Syscall_ValidString(const char *Addr)
366 * \brief Checks if a memory address contains a valid string
368 int Syscall_ValidString(const char *Addr)
370 // Check if the memory is user memory
371 if(!MM_IsUser( (tVAddr) Addr)) return 0;
373 return CheckString( Addr );
377 * \fn int Syscall_Valid(int Size, const void *Addr)
378 * \brief Checks if a memory address is valid
380 int Syscall_Valid(int Size, const void *Addr)
382 if(!MM_IsUser( (tVAddr)Addr )) return 0;
384 return CheckMem( Addr, Size );