2 * AcessOS Microkernel Version
16 # define MERR(f,v...) Log_Debug("Syscalls", "0x%x "f, callNum ,## v)
18 # define MERR(v...) do{}while(0)
21 #define CHECK_NUM_NULLOK(v,size) \
22 if((v)&&!Syscall_Valid((size),(v))){MERR("CHECK_NUM_NULLOK: %p(%x) FAIL",v,size);ret=-1;err=-EINVAL;break;}
23 #define CHECK_STR_NULLOK(v) \
24 if((v)&&!Syscall_ValidString((v))){MERR("CHECK_STR_NULLOK: %p FAIL",v);ret=-1;err=-EINVAL;break;}
25 #define CHECK_NUM_NONULL(v,size) \
26 if(!(v)||!Syscall_Valid((size),(v))){MERR("CHECK_NUM_NONULL: %p(%x) FAIL",v,size);ret=-1;err=-EINVAL;break;}
27 #define CHECK_STR_NONULL(v) \
28 if(!(v)||!Syscall_ValidString((v))){MERR("CHECK_STR_NONULL: %p FAIL",v);ret=-1;err=-EINVAL;break;}
29 #define CHECK_STR_ARRAY(arr) do {\
31 char **tmp = (char**)arr; \
32 CHECK_NUM_NULLOK( tmp, sizeof(char**) ); \
33 for(i=0;tmp&&tmp[i];i++) { \
34 CHECK_STR_NONULL( tmp[i] ); \
35 CHECK_NUM_NONULL( &tmp[i+1], sizeof(char*) ); \
41 extern Uint Binary_Load(const char *file, Uint *entryPoint);
44 void SyscallHandler(tSyscallRegs *Regs);
45 int Syscall_ValidString(const char *Addr);
46 int Syscall_Valid(int Size, const void *Addr);
47 int Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask);
50 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
51 void SyscallHandler(tSyscallRegs *Regs)
55 int callNum = Regs->Num;
58 if(callNum != SYS_READ && callNum != SYS_WRITE) {
60 ENTER("iThread iNum", Threads_GetTID(), callNum);
61 if(callNum < NUM_SYSCALLS)
62 LOG("Syscall %s", cSYSCALL_NAMES[callNum]);
63 LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
70 // -- Exit the current thread
71 case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
73 // -- Put the current thread to sleep
74 case SYS_SLEEP: Threads_Sleep(); break;
76 // -- Yield current timeslice
77 case SYS_YIELD: Threads_Yield(); break;
79 // -- Set Error Handler
80 case SYS_SETFAULTHANDLER:
81 Threads_SetFaultHandler(Regs->Arg1);
84 // -- Clone the current thread
86 // Call clone system call
87 ret = Proc_Clone(Regs->Arg1);
96 // -- Wait fr an event
99 ret = Threads_WaitEvents(Regs->Arg1);
102 // -- Wait for a thread
104 // Sanity Check (Status can be NULL)
105 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
107 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
110 // -- Get the physical address of a page
112 ret = MM_GetPhysAddr( (void*)Regs->Arg1 );
116 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
118 // -- Allocate an address
119 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
121 // -- Unmap an address
122 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
124 // -- Change the protection on an address
126 ret = Syscall_MM_SetFlags((void*)Regs->Arg1, Regs->Arg2, Regs->Arg3);
129 // -- Get Thread/Process IDs
130 case SYS_GETTID: ret = Threads_GetTID(); break;
131 case SYS_GETPID: ret = Threads_GetPID(); break;
133 // -- Get User/Group IDs
134 case SYS_GETUID: ret = Threads_GetUID(); break;
135 case SYS_GETGID: ret = Threads_GetGID(); break;
137 // -- Set User/Group IDs
138 case SYS_SETUID: ret = Threads_SetUID(Regs->Arg1); break;
139 case SYS_SETGID: ret = Threads_SetGID(Regs->Arg1); break;
143 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
144 // Destination, Size, *Data
145 ret = Proc_SendMessage(Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
147 // -- Check for messages
149 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
150 if( Regs->Arg3 != -1 )
151 CHECK_NUM_NULLOK((void*)Regs->Arg3, Regs->Arg2);
153 ret = Proc_GetMessage((Uint*)Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
156 // -- Get the current timestamp
161 // -- Set the thread's name
163 CHECK_STR_NONULL( (char*) Regs->Arg1);
164 Threads_SetName( (char*)Regs->Arg1 );
170 // -- Create a new process
172 CHECK_STR_NONULL((const char*)Regs->Arg1);
173 CHECK_STR_ARRAY((const char**)Regs->Arg2);
174 CHECK_STR_ARRAY((const char**)Regs->Arg3);
176 CHECK_NUM_NONULL((void*)Regs->Arg5, Regs->Arg4*sizeof(int));
178 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
179 Regs->Arg4, (int*)Regs->Arg5
182 // -- Replace the current process with another
184 CHECK_STR_NONULL((char*)Regs->Arg1);
185 CHECK_STR_ARRAY( (char**)Regs->Arg2 );
187 CHECK_STR_ARRAY( (char**)Regs->Arg3 );
188 LEAVE('s', "Assuming 0");
189 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
191 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
195 // -- Load a binary into the current process
197 CHECK_STR_NONULL( (char*)Regs->Arg1 );
198 CHECK_NUM_NONULL( (Uint*)Regs->Arg2, sizeof(Uint) );
200 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
204 // Virtual Filesystem
207 CHECK_STR_NONULL( (char*)Regs->Arg1 );
208 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
209 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
213 LOG("VFS_Close(%i)", Regs->Arg1);
214 VFS_Close( Regs->Arg1 );
218 LOG("VFS_DuplicateFD(%i,%i)", Regs->Arg1, Regs->Arg2);
219 ret = VFS_DuplicateFD(Regs->Arg1, Regs->Arg2);
224 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
226 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
231 ret = VFS_Tell( Regs->Arg1 );
235 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
236 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
240 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
241 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
245 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
247 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
252 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
253 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
258 // TODO: What if the filename is longer?
259 // Maybe force it to be a 256 byte buffer
260 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
261 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
264 // Open a file that is a entry in an open directory
266 CHECK_STR_NONULL( (char*)Regs->Arg2 );
267 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
272 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
273 ret = VFS_ChDir( (const char*)Regs->Arg1 );
278 // All sanity checking should be done by the driver
279 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
280 MERR("IOCtl Invalid arg %p", Regs->Arg3);
281 err = -EINVAL; ret = -1; break;
283 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
286 // Mount a filesystem
288 // Only root can mount filesystems
289 if(Threads_GetUID() != 0) {
297 if( !Syscall_ValidString((char*)Regs->Arg2) ) {
303 ret = VFS_Unmount((char*)Regs->Arg2);
307 // Sanity check the paths
308 if(!Syscall_ValidString((char*)Regs->Arg1)
309 || !Syscall_ValidString((char*)Regs->Arg2)
310 || (Regs->Arg3 && !Syscall_ValidString((char*)Regs->Arg3))
311 || !Syscall_ValidString((char*)Regs->Arg4) ) {
317 (char*)Regs->Arg1, // Device
318 (char*)Regs->Arg2, // Mount point
319 (char*)Regs->Arg3, // Filesystem
320 (char*)Regs->Arg4 // Options
325 // Wait on a set of handles
328 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
329 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
330 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
331 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
339 Regs->Arg1, // Max handle
340 (fd_set *)Regs->Arg2, // Read
341 (fd_set *)Regs->Arg3, // Write
342 (fd_set *)Regs->Arg4, // Errors
343 (tTime *)Regs->Arg5, // Timeout
344 (Uint32)Regs->Arg6, // Extra wakeup events
352 CHECK_STR_NONULL( (char*)Regs->Arg1 );
353 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
354 LogF((const char*)Regs->Arg1,
355 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
360 // -- Default (Return Error)
362 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
363 if(Regs->Num < NUM_SYSCALLS)
364 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
370 if(err == 0) err = errno;
373 LOG("ID: %i, Return errno = %i", Regs->Num, err);
377 Regs->Return = ret&0xFFFFFFFF;
378 Regs->RetHi = ret >> 32;
385 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
387 LOG("err = %i", err);
388 if( callNum == SYS_EXECVE )
389 LOG("Actual %i", ret);
399 * \fn int Syscall_ValidString(const char *Addr)
400 * \brief Checks if a memory address contains a valid string
402 int Syscall_ValidString(const char *Addr)
404 // Check if the memory is user memory
405 if(!MM_IsUser( (tVAddr) Addr)) return 0;
407 return CheckString( Addr );
411 * \fn int Syscall_Valid(int Size, const void *Addr)
412 * \brief Checks if a memory address is valid
414 int Syscall_Valid(int Size, const void *Addr)
416 if(!MM_IsUser( (tVAddr)Addr )) {
417 Log_Debug("Syscalls", "Syscall_Valid - %p not user", Addr);
421 return CheckMem( Addr, Size );
424 int Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask)
426 tPAddr paddr = MM_GetPhysAddr(Addr);
427 Flags &= MM_PFLAG_RO|MM_PFLAG_EXEC;
428 Mask &= MM_PFLAG_RO|MM_PFLAG_EXEC;
430 //Log_Debug("Syscalls", "SYS_SETFLAGS: %p %x %x", Addr, Flags, Mask);
433 if( (Mask & MM_PFLAG_RO) && !(Flags & MM_PFLAG_RO) ) {
435 // HACK - Assume that RO mmap'd files are immutable
436 if( MM_GetPageNode(paddr, &node) == 0 && node ) {
437 Flags |= MM_PFLAG_COW;
438 Mask |= MM_PFLAG_COW;
441 MM_SetFlags((tVAddr)Addr, Flags, Mask);