2 * AcessOS Microkernel Version
13 #define CHECK_NUM_NULLOK(v,size) \
14 if((v)&&!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
15 #define CHECK_STR_NULLOK(v) \
16 if((v)&&!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
17 #define CHECK_NUM_NONULL(v,size) \
18 if(!(v)||!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
19 #define CHECK_STR_NONULL(v) \
20 if(!(v)||!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
23 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
24 extern Uint Binary_Load(char *file, Uint *entryPoint);
27 void SyscallHandler(tSyscallRegs *Regs);
28 int Syscall_ValidString(Uint Addr);
29 int Syscall_Valid(int Size, Uint Addr);
32 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
33 void SyscallHandler(tSyscallRegs *Regs)
37 int callNum = Regs->Num;
40 if(callNum != SYS_READ && callNum != SYS_WRITE) {
42 ENTER("iThread iNum", Threads_GetTID(), callNum);
43 if(callNum < NUM_SYSCALLS)
44 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
45 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
52 // -- Exit the current thread
53 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
55 // -- Put the current thread to sleep
56 case SYS_SLEEP: Threads_Sleep(); break;
58 // -- Yield current timeslice
59 case SYS_YIELD: Threads_Yield(); break;
61 // -- Set Error Handler
62 case SYS_SETFAULTHANDLER:
63 Threads_SetFaultHandler(Regs->Arg1);
66 // -- Clone the current thread
68 // Call clone system call
69 ret = Proc_Clone(&err, Regs->Arg1);
70 // Change user stack if a new stack address is passed
71 if(ret == 0 && Regs->Arg2)
72 Regs->StackPointer = Regs->Arg2;
81 // -- Wait for a thread
83 // Sanity Check (Status can be NULL)
84 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
86 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
89 // -- Get the physical address of a page
91 ret = MM_GetPhysAddr(Regs->Arg1);
95 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
97 // -- Allocate an address
98 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
100 // -- Unmap an address
101 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
103 // -- Get Thread/Process IDs
104 case SYS_GETTID: ret = Threads_GetTID(); break;
105 case SYS_GETPID: ret = Threads_GetPID(); break;
107 // -- Get User/Group IDs
108 case SYS_GETUID: ret = Threads_GetUID(); break;
109 case SYS_GETGID: ret = Threads_GetGID(); break;
111 // -- Set User/Group IDs
112 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
113 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
117 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
118 // Destination, Size, *Data
119 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
121 // -- Check for messages
123 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
124 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
125 err = -EINVAL; ret = -1; break;
128 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
131 // -- Get the current timestamp
136 // -- Set the thread's name
138 CHECK_STR_NONULL(Regs->Arg1);
139 Threads_SetName( (char*)Regs->Arg1 );
145 // -- Replace the current process with another
147 CHECK_STR_NONULL(Regs->Arg1);
148 // Check the argument arrays
151 char **tmp = (char**)Regs->Arg2;
152 // Check ArgV (traverse array checking all string pointers)
153 CHECK_NUM_NONULL( tmp, sizeof(char**) );
154 //Log("tmp = %p", tmp);
155 for(i=0;tmp[i];i++) {
156 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
157 CHECK_STR_NONULL( tmp[i] );
160 // - EnvP can be NULL
163 tmp = (char**)Regs->Arg3;
164 //Log("tmp = %p", tmp);
165 for(i=0;tmp[i];i++) {
166 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
167 CHECK_STR_NONULL( tmp[i] );
171 LEAVE('s', "Assuming 0");
172 // Path, **Argv, **Envp
173 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
175 // -- Load a binary into the current process
177 if( !Syscall_ValidString(Regs->Arg1)
178 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
184 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
188 // Virtual Filesystem
191 if( !Syscall_ValidString(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( Regs->Arg3, Regs->Arg2 );
219 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
223 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
224 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
228 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
230 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
235 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
240 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
245 // TODO: What if the filename is longer?
246 // Maybe force it to be a 256 byte buffer
247 if( !Syscall_Valid(8, Regs->Arg2) ) {
252 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
255 // Open a file that is a entry in an open directory
257 if( !Syscall_ValidString(Regs->Arg2) ) {
262 ret = VFS_OpenChild( &err, Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
267 if( !Syscall_ValidString(Regs->Arg1) ) {
272 ret = VFS_ChDir( (void*)Regs->Arg1 );
277 // All sanity checking should be done by the driver
278 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
281 // Mount a filesystem
283 // Only root can mount filesystems
284 if(Threads_GetUID() != 0) {
289 // Sanity check the paths
290 if(!Syscall_ValidString(Regs->Arg1)
291 || !Syscall_ValidString(Regs->Arg2)
292 || !Syscall_ValidString(Regs->Arg3)
293 || !Syscall_ValidString(Regs->Arg4) ) {
299 (char*)Regs->Arg1, // Device
300 (char*)Regs->Arg2, // Mount point
301 (char*)Regs->Arg3, // Filesystem
302 (char*)Regs->Arg4 // Options
306 // Wait on a set of handles
309 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), Regs->Arg2))
310 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), Regs->Arg3))
311 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), Regs->Arg4))
312 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), 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
332 LogF("Log: [%i] ", Threads_GetTID());
333 LogF((char*)Regs->Arg1,
334 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
339 // -- Default (Return Error)
341 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
342 if(Regs->Num < NUM_SYSCALLS)
343 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
350 LOG("ID: %i, Return errno = %i", Regs->Num, err);
354 Regs->Return = ret&0xFFFFFFFF;
355 Regs->RetHi = ret >> 32;
362 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
364 LOG("err = %i", err);
365 if(Regs->Num != SYS_EXECVE)
368 LOG("Actual %i", ret);
376 * \fn int Syscall_ValidString(Uint Addr)
377 * \brief Checks if a memory address contains a valid string
379 int Syscall_ValidString(Uint Addr)
381 // Check if the memory is user memory
382 if(!MM_IsUser(Addr)) return 0;
384 return CheckString( (char*)Addr );
388 * \fn int Syscall_Valid(int Size, Uint Addr)
389 * \brief Checks if a memory address is valid
391 int Syscall_Valid(int Size, Uint Addr)
393 if(!MM_IsUser(Addr)) return 0;
395 return CheckMem( (void*)Addr, Size );