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 VFS_FInfo(int FD, void *Dest, int MaxACLs);
29 extern int VFS_GetACL(int FD, void *Dest);
30 extern int VFS_ChDir(char *Dest);
31 extern int Threads_SetName(char *NewName);
32 extern int Threads_GetPID();
33 extern int Threads_GetTID();
34 extern int Threads_GetUID();
35 extern int Threads_GetGID();
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);
56 // -- Exit the current thread
57 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
59 // -- Put the current thread to sleep
60 case SYS_SLEEP: Threads_Sleep(); break;
62 // -- Yield current timeslice
63 case SYS_YIELD: Threads_Yield(); break;
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: Log("Setting User ID to %i", Regs->Arg1); break;
112 case SYS_SETGID: Log("Setting Group ID to %i", 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 //NOTE: Uncertain due to length being unknown
124 // (Proc_GetMessage should check itself)
125 CHECK_NUM_NULLOK(Regs->Arg2, sizeof(Uint)*4);
127 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
130 // -- Set the thread's name
132 CHECK_STR_NONULL(Regs->Arg1);
133 Threads_SetName( (char*)Regs->Arg1 );
140 CHECK_STR_NONULL(Regs->Arg1);
141 //Log(" Regs = {Arg2: %x, Arg3: %x}", Regs->Arg2, Regs->Arg3);
144 char **tmp = (char**)Regs->Arg2;
145 // Check ArgV (traverse array checking all string pointers)
146 CHECK_NUM_NONULL( tmp, sizeof(char**) );
147 //Log("tmp = %p", tmp);
148 for(i=0;tmp[i];i++) {
149 CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
150 CHECK_STR_NONULL( tmp[i] );
153 // - EnvP can be NULL
156 tmp = (char**)Regs->Arg3;
157 //Log("tmp = %p", tmp);
158 for(i=0;tmp[i];i++) {
159 CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
160 CHECK_STR_NONULL( tmp[i] );
164 // Path, **Argv, **Envp
165 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
168 if( !Syscall_ValidString(Regs->Arg1)
169 || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
175 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
179 // Virtual Filesystem
182 if( !Syscall_ValidString(Regs->Arg1) ) {
187 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
191 VFS_Close( Regs->Arg1 );
195 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
199 ret = VFS_Tell( Regs->Arg1 );
203 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
204 ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
208 CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
209 ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
213 CHECK_NUM_NONULL( Regs->Arg2, sizeof(struct s_sysFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
215 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
220 if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
225 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
230 if( !Syscall_Valid(8, Regs->Arg2) ) {
235 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
240 if( !Syscall_ValidString(Regs->Arg1) ) {
245 ret = VFS_ChDir( (void*)Regs->Arg1 );
250 // All sanity checking should be done by the driver
251 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
254 // Mount a filesystem
256 // Only root can mount filesystems
257 if(Threads_GetUID() != 0) {
262 // Sanity check the paths
263 if(!Syscall_ValidString(Regs->Arg1)
264 || !Syscall_ValidString(Regs->Arg2)
265 || !Syscall_ValidString(Regs->Arg3)
266 || !Syscall_ValidString(Regs->Arg4) ) {
272 (char*)Regs->Arg1, // Device
273 (char*)Regs->Arg2, // Mount point
274 (char*)Regs->Arg3, // Filesystem
275 (char*)Regs->Arg4 // Options
282 Log((char*)Regs->Arg1,
283 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
287 // -- Default (Return Error)
289 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
290 if(Regs->Num < NUM_SYSCALLS)
291 Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
298 LOG("ID: %i, Return errno = %i", Regs->Num, err);
302 Regs->Return = ret&0xFFFFFFFF;
303 Regs->RetHi = ret >> 32;
309 LOG("err = %i", err);
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 );