2 * AcessOS Microkernel Version
12 #define CHECK_NUM_NULLOK(v,size) \
13 if((v)&&!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
14 #define CHECK_STR_NULLOK(v) \
15 if((v)&&!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
16 #define CHECK_NUM_NONULL(v,size) \
17 if(!(v)||!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
18 #define CHECK_STR_NONULL(v) \
19 if(!(v)||!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
22 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
23 extern Uint Binary_Load(char *file, Uint *entryPoint);
26 void SyscallHandler(tSyscallRegs *Regs);
27 int Syscall_ValidString(Uint Addr);
28 int Syscall_Valid(int Size, Uint Addr);
31 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
32 void SyscallHandler(tSyscallRegs *Regs)
36 int callNum = Regs->Num;
39 if(callNum != SYS_READ && callNum != SYS_WRITE) {
41 ENTER("iThread iNum", Threads_GetTID(), callNum);
42 if(callNum < NUM_SYSCALLS)
43 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
44 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
51 // -- Exit the current thread
52 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
54 // -- Put the current thread to sleep
55 case SYS_SLEEP: Threads_Sleep(); break;
57 // -- Yield current timeslice
58 case SYS_YIELD: Threads_Yield(); break;
60 // -- Set Error Handler
61 case SYS_SETFAULTHANDLER:
62 Threads_SetFaultHandler(Regs->Arg1);
65 // -- Clone the current thread
67 // Call clone system call
68 ret = Proc_Clone(&err, Regs->Arg1);
69 // Change user stack if a new stack address is passed
70 if(ret == 0 && Regs->Arg2)
71 Regs->StackPointer = Regs->Arg2;
80 // -- Wait for a thread
82 // Sanity Check (Status can be NULL)
83 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
85 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
88 // -- Get the physical address of a page
90 ret = MM_GetPhysAddr(Regs->Arg1);
94 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
96 // -- Allocate an address
97 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
99 // -- Unmap an address
100 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
102 // -- Get Thread/Process IDs
103 case SYS_GETTID: ret = Threads_GetTID(); break;
104 case SYS_GETPID: ret = Threads_GetPID(); break;
106 // -- Get User/Group IDs
107 case SYS_GETUID: ret = Threads_GetUID(); break;
108 case SYS_GETGID: ret = Threads_GetGID(); break;
110 // -- Set User/Group IDs
111 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
112 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
116 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
117 // Destination, Size, *Data
118 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
120 // -- Check for messages
122 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
123 if( Regs->Arg2 && Regs->Arg2 != -1 && !MM_IsUser(Regs->Arg2) ) {
124 err = -EINVAL; ret = -1; break;
127 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
130 // -- Get the current timestamp
135 // -- Set the thread's name
137 CHECK_STR_NONULL(Regs->Arg1);
138 Threads_SetName( (char*)Regs->Arg1 );
144 // -- Replace the current process with another
146 CHECK_STR_NONULL(Regs->Arg1);
147 // Check the argument arrays
150 char **tmp = (char**)Regs->Arg2;
151 // Check ArgV (traverse array checking all string pointers)
152 CHECK_NUM_NONULL( tmp, sizeof(char**) );
153 //Log("tmp = %p", tmp);
154 for(i=0;tmp[i];i++) {
155 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
156 CHECK_STR_NONULL( tmp[i] );
159 // - EnvP can be NULL
162 tmp = (char**)Regs->Arg3;
163 //Log("tmp = %p", tmp);
164 for(i=0;tmp[i];i++) {
165 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
166 CHECK_STR_NONULL( tmp[i] );
170 LEAVE('s', "Assuming 0");
171 // Path, **Argv, **Envp
172 ret = Proc_Execve( (char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3 );
174 // -- Load a binary into the current process
176 if( !Syscall_ValidString(Regs->Arg1)
177 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
183 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
187 // Virtual Filesystem
190 if( !Syscall_ValidString(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( Regs->Arg3, Regs->Arg2 );
218 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
222 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
223 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
227 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
229 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
234 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
239 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
244 // TODO: What if the filename is longer?
245 // Maybe force it to be a 256 byte buffer
246 if( !Syscall_Valid(8, Regs->Arg2) ) {
251 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
254 // Open a file that is a entry in an open directory
256 if( !Syscall_ValidString(Regs->Arg2) ) {
261 ret = VFS_OpenChild( &err, Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
266 if( !Syscall_ValidString(Regs->Arg1) ) {
271 ret = VFS_ChDir( (void*)Regs->Arg1 );
276 // All sanity checking should be done by the driver
277 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
280 // Mount a filesystem
282 // Only root can mount filesystems
283 if(Threads_GetUID() != 0) {
288 // Sanity check the paths
289 if(!Syscall_ValidString(Regs->Arg1)
290 || !Syscall_ValidString(Regs->Arg2)
291 || !Syscall_ValidString(Regs->Arg3)
292 || !Syscall_ValidString(Regs->Arg4) ) {
298 (char*)Regs->Arg1, // Device
299 (char*)Regs->Arg2, // Mount point
300 (char*)Regs->Arg3, // Filesystem
301 (char*)Regs->Arg4 // Options
308 LogF("Log: [%i] ", Threads_GetTID());
309 LogF((char*)Regs->Arg1,
310 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
315 // -- Default (Return Error)
317 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
318 if(Regs->Num < NUM_SYSCALLS)
319 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
326 LOG("ID: %i, Return errno = %i", Regs->Num, err);
330 Regs->Return = ret&0xFFFFFFFF;
331 Regs->RetHi = ret >> 32;
338 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
340 LOG("err = %i", err);
341 if(Regs->Num != SYS_EXECVE)
344 LOG("Actual %i", ret);
352 * \fn int Syscall_ValidString(Uint Addr)
353 * \brief Checks if a memory address contains a valid string
355 int Syscall_ValidString(Uint Addr)
357 // Check if the memory is user memory
358 if(!MM_IsUser(Addr)) return 0;
360 return CheckString( (char*)Addr );
364 * \fn int Syscall_Valid(int Size, Uint Addr)
365 * \brief Checks if a memory address is valid
367 int Syscall_Valid(int Size, Uint Addr)
369 if(!MM_IsUser(Addr)) return 0;
371 return CheckMem( (void*)Addr, Size );