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_Clone(Uint *Err, Uint Flags);
23 extern int Threads_WaitTID(int TID, int *status);
24 extern Uint Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
25 extern int Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
26 extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
27 extern Uint Binary_Load(char *file, Uint *entryPoint);
28 extern int Threads_SetName(char *NewName);
29 extern int Threads_GetPID();
30 extern int Threads_GetTID();
31 extern tUID Threads_GetUID();
32 extern int Threads_SetUID(Uint *errno, tUID ID);
33 extern tGID Threads_GetGID();
34 extern int Threads_SetGID(Uint *errno, tGID ID);
35 extern int Threads_SetFaultHandler(Uint Handler);
38 int Syscall_ValidString(Uint Addr);
39 int Syscall_Valid(int Size, Uint Addr);
42 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
43 void SyscallHandler(tSyscallRegs *Regs)
48 ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
49 if(Regs->Num < NUM_SYSCALLS)
50 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
51 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
55 // -- Exit the current thread
56 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
58 // -- Put the current thread to sleep
59 case SYS_SLEEP: Threads_Sleep(); break;
61 // -- Yield current timeslice
62 case SYS_YIELD: Threads_Yield(); break;
64 // -- Set Error Handler
65 case SYS_SETFAULTHANDLER:
66 Threads_SetFaultHandler(Regs->Arg1);
69 // -- Clone the current thread
71 // Call clone system call
72 ret = Proc_Clone(&err, Regs->Arg1);
73 // Change user stack if a new stack address is passed
74 if(ret == 0 && Regs->Arg2)
75 Regs->StackPointer = Regs->Arg2;
84 // -- Wait for a thread
86 // Sanity Check (Status can be NULL)
87 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
89 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
92 // -- Get the physical address of a page
94 ret = MM_GetPhysAddr(Regs->Arg1);
98 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
100 // -- Allocate an address
101 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
103 // -- Unmap an address
104 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
106 // -- Get Thread/Process IDs
107 case SYS_GETTID: ret = Threads_GetTID(); break;
108 case SYS_GETPID: ret = Threads_GetPID(); break;
110 // -- Get User/Group IDs
111 case SYS_GETUID: ret = Threads_GetUID(); break;
112 case SYS_GETGID: ret = Threads_GetGID(); break;
114 // -- Set User/Group IDs
115 case SYS_SETUID: ret = Threads_SetUID(&err, Regs->Arg1); break;
116 case SYS_SETGID: ret = Threads_SetGID(&err, Regs->Arg1); break;
120 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
121 // Destination, Size, *Data
122 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
124 // -- Check for messages
126 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
127 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 // -- Set the thread's name
137 CHECK_STR_NONULL(Regs->Arg1);
138 Threads_SetName( (char*)Regs->Arg1 );
145 CHECK_STR_NONULL(Regs->Arg1);
146 //Log(" Regs = {Arg2: %x, Arg3: %x}", Regs->Arg2, Regs->Arg3);
149 char **tmp = (char**)Regs->Arg2;
150 // Check ArgV (traverse array checking all string pointers)
151 CHECK_NUM_NONULL( tmp, sizeof(char**) );
152 //Log("tmp = %p", tmp);
153 for(i=0;tmp[i];i++) {
154 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
155 CHECK_STR_NONULL( tmp[i] );
158 // - EnvP can be NULL
161 tmp = (char**)Regs->Arg3;
162 //Log("tmp = %p", tmp);
163 for(i=0;tmp[i];i++) {
164 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
165 CHECK_STR_NONULL( tmp[i] );
169 LEAVE('s', "Assuming 0");
170 // Path, **Argv, **Envp
171 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
174 if( !Syscall_ValidString(Regs->Arg1)
175 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
181 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
185 // Virtual Filesystem
188 if( !Syscall_ValidString(Regs->Arg1) ) {
193 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
197 VFS_Close( Regs->Arg1 );
202 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
204 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
209 ret = VFS_Tell( Regs->Arg1 );
213 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
214 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
218 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
219 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
223 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
225 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
230 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
235 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
240 if( !Syscall_Valid(8, Regs->Arg2) ) {
245 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
248 // Open a file that is a entry in an open directory
250 if( !Syscall_ValidString(Regs->Arg2) ) {
255 ret = VFS_OpenChild( &err, Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3);
260 if( !Syscall_ValidString(Regs->Arg1) ) {
265 ret = VFS_ChDir( (void*)Regs->Arg1 );
270 // All sanity checking should be done by the driver
271 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
274 // Mount a filesystem
276 // Only root can mount filesystems
277 if(Threads_GetUID() != 0) {
282 // Sanity check the paths
283 if(!Syscall_ValidString(Regs->Arg1)
284 || !Syscall_ValidString(Regs->Arg2)
285 || !Syscall_ValidString(Regs->Arg3)
286 || !Syscall_ValidString(Regs->Arg4) ) {
292 (char*)Regs->Arg1, // Device
293 (char*)Regs->Arg2, // Mount point
294 (char*)Regs->Arg3, // Filesystem
295 (char*)Regs->Arg4 // Options
302 Log((char*)Regs->Arg1,
303 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
307 // -- Default (Return Error)
309 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
310 if(Regs->Num < NUM_SYSCALLS)
311 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
318 LOG("ID: %i, Return errno = %i", Regs->Num, err);
322 Regs->Return = ret&0xFFFFFFFF;
323 Regs->RetHi = ret >> 32;
329 LOG("err = %i", err);
330 if(Regs->Num != SYS_EXECVE)
333 LOG("Actual %i", ret);
338 * \fn int Syscall_ValidString(Uint Addr)
339 * \brief Checks if a memory address contains a valid string
341 int Syscall_ValidString(Uint Addr)
343 // Check if the memory is user memory
344 if(!MM_IsUser(Addr)) return 0;
346 return CheckString( (char*)Addr );
350 * \fn int Syscall_Valid(int Size, Uint Addr)
351 * \brief Checks if a memory address is valid
353 int Syscall_Valid(int Size, Uint Addr)
355 if(!MM_IsUser(Addr)) return 0;
357 return CheckMem( (void*)Addr, Size );