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 int Threads_GetUID();
32 extern int Threads_GetGID();
35 int Syscall_ValidString(Uint Addr);
36 int Syscall_Valid(int Size, Uint Addr);
39 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
40 void SyscallHandler(tSyscallRegs *Regs)
45 ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
46 if(Regs->Num < NUM_SYSCALLS)
47 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
48 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 // -- Clone the current thread
63 // Call clone system call
64 ret = Proc_Clone(&err, Regs->Arg1);
65 // Change user stack if a new stack address is passed
66 if(ret == 0 && Regs->Arg2)
67 Regs->StackPointer = Regs->Arg2;
76 // -- Wait for a thread
78 // Sanity Check (Status can be NULL)
79 CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
81 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
84 // -- Get the physical address of a page
86 ret = MM_GetPhysAddr(Regs->Arg1);
90 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
92 // -- Allocate an address
93 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
95 // -- Unmap an address
96 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
98 // -- Get Thread/Process IDs
99 case SYS_GETTID: ret = Threads_GetTID(); break;
100 case SYS_GETPID: ret = Threads_GetPID(); break;
102 // -- Get User/Group IDs
103 case SYS_GETUID: ret = Threads_GetUID(); break;
104 case SYS_GETGID: ret = Threads_GetGID(); break;
106 // -- Set User/Group IDs
107 case SYS_SETUID: Log("Setting User ID to %i", Regs->Arg1); break;
108 case SYS_SETGID: Log("Setting Group ID to %i", Regs->Arg1); break;
112 CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
113 // Destination, Size, *Data
114 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
116 // -- Check for messages
118 CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
119 //NOTE: Uncertain due to length being unknown
120 // (Proc_GetMessage should check itself)
121 CHECK_NUM_NULLOK(Regs->Arg2, sizeof(Uint)*4);
123 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
126 // -- Set the thread's name
128 CHECK_STR_NONULL(Regs->Arg1);
129 Threads_SetName( (char*)Regs->Arg1 );
136 CHECK_STR_NONULL(Regs->Arg1);
137 //Log(" Regs = {Arg2: %x, Arg3: %x}", Regs->Arg2, Regs->Arg3);
140 char **tmp = (char**)Regs->Arg2;
141 // Check ArgV (traverse array checking all string pointers)
142 CHECK_NUM_NONULL( tmp, sizeof(char**) );
143 //Log("tmp = %p", tmp);
144 for(i=0;tmp[i];i++) {
145 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
146 CHECK_STR_NONULL( tmp[i] );
149 // - EnvP can be NULL
152 tmp = (char**)Regs->Arg3;
153 //Log("tmp = %p", tmp);
154 for(i=0;tmp[i];i++) {
155 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
156 CHECK_STR_NONULL( tmp[i] );
160 LEAVE('s', "Assuming 0");
161 // Path, **Argv, **Envp
162 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
165 if( !Syscall_ValidString(Regs->Arg1)
166 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
172 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
176 // Virtual Filesystem
179 if( !Syscall_ValidString(Regs->Arg1) ) {
184 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
188 VFS_Close( Regs->Arg1 );
192 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
196 ret = VFS_Tell( Regs->Arg1 );
200 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
201 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
205 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
206 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
210 CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
212 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
217 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
222 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
227 if( !Syscall_Valid(8, Regs->Arg2) ) {
232 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
237 if( !Syscall_ValidString(Regs->Arg1) ) {
242 ret = VFS_ChDir( (void*)Regs->Arg1 );
247 // All sanity checking should be done by the driver
248 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
251 // Mount a filesystem
253 // Only root can mount filesystems
254 if(Threads_GetUID() != 0) {
259 // Sanity check the paths
260 if(!Syscall_ValidString(Regs->Arg1)
261 || !Syscall_ValidString(Regs->Arg2)
262 || !Syscall_ValidString(Regs->Arg3)
263 || !Syscall_ValidString(Regs->Arg4) ) {
269 (char*)Regs->Arg1, // Device
270 (char*)Regs->Arg2, // Mount point
271 (char*)Regs->Arg3, // Filesystem
272 (char*)Regs->Arg4 // Options
279 Log((char*)Regs->Arg1,
280 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
284 // -- Default (Return Error)
286 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
287 if(Regs->Num < NUM_SYSCALLS)
288 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
295 LOG("ID: %i, Return errno = %i", Regs->Num, err);
299 Regs->Return = ret&0xFFFFFFFF;
300 Regs->RetHi = ret >> 32;
306 LOG("err = %i", err);
307 if(Regs->Num != SYS_EXECVE)
310 LOG("Actual %i", ret);
315 * \fn int Syscall_ValidString(Uint Addr)
316 * \brief Checks if a memory address contains a valid string
318 int Syscall_ValidString(Uint Addr)
320 // Check if the memory is user memory
321 if(!MM_IsUser(Addr)) return 0;
323 return CheckString( (char*)Addr );
327 * \fn int Syscall_Valid(int Size, Uint Addr)
328 * \brief Checks if a memory address is valid
330 int Syscall_Valid(int Size, Uint Addr)
332 if(!MM_IsUser(Addr)) return 0;
334 return CheckMem( (void*)Addr, Size );