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_NONULL( tmp, sizeof(char**) ); \
33 for(i=0;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);
175 CHECK_NUM_NULLOK((void*)Regs->Arg5, Regs->Arg4*sizeof(int));
177 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
178 Regs->Arg4, (int*)Regs->Arg5
181 // -- Replace the current process with another
183 CHECK_STR_NONULL((char*)Regs->Arg1);
184 CHECK_STR_ARRAY( (char**)Regs->Arg2 );
186 CHECK_STR_ARRAY( (char**)Regs->Arg3 );
187 LEAVE('s', "Assuming 0");
188 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
190 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
194 // -- Load a binary into the current process
196 CHECK_STR_NONULL( (char*)Regs->Arg1 );
197 CHECK_NUM_NONULL( (Uint*)Regs->Arg2, sizeof(Uint) );
199 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
203 // Virtual Filesystem
206 CHECK_STR_NONULL( (char*)Regs->Arg1 );
207 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
208 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
212 LOG("VFS_Close(%i)", Regs->Arg1);
213 VFS_Close( Regs->Arg1 );
218 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
220 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
225 ret = VFS_Tell( Regs->Arg1 );
229 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
230 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
234 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
235 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
239 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
241 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
246 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
247 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
252 // TODO: What if the filename is longer?
253 // Maybe force it to be a 256 byte buffer
254 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
255 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
258 // Open a file that is a entry in an open directory
260 CHECK_STR_NONULL( (char*)Regs->Arg2 );
261 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
266 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
267 ret = VFS_ChDir( (const char*)Regs->Arg1 );
272 // All sanity checking should be done by the driver
273 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
274 MERR("IOCtl Invalid arg %p", Regs->Arg3);
275 err = -EINVAL; ret = -1; break;
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) {
291 if( !Syscall_ValidString((char*)Regs->Arg2) ) {
297 ret = VFS_Unmount((char*)Regs->Arg2);
301 // Sanity check the paths
302 if(!Syscall_ValidString((char*)Regs->Arg1)
303 || !Syscall_ValidString((char*)Regs->Arg2)
304 || (Regs->Arg3 && !Syscall_ValidString((char*)Regs->Arg3))
305 || !Syscall_ValidString((char*)Regs->Arg4) ) {
311 (char*)Regs->Arg1, // Device
312 (char*)Regs->Arg2, // Mount point
313 (char*)Regs->Arg3, // Filesystem
314 (char*)Regs->Arg4 // Options
319 // Wait on a set of handles
322 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
323 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
324 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
325 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
333 Regs->Arg1, // Max handle
334 (fd_set *)Regs->Arg2, // Read
335 (fd_set *)Regs->Arg3, // Write
336 (fd_set *)Regs->Arg4, // Errors
337 (tTime *)Regs->Arg5, // Timeout
338 (Uint32)Regs->Arg6, // Extra wakeup events
346 CHECK_STR_NONULL( (char*)Regs->Arg1 );
347 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
348 LogF((const char*)Regs->Arg1,
349 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
354 // -- Default (Return Error)
356 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
357 if(Regs->Num < NUM_SYSCALLS)
358 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
364 if(err == 0) err = errno;
367 LOG("ID: %i, Return errno = %i", Regs->Num, err);
371 Regs->Return = ret&0xFFFFFFFF;
372 Regs->RetHi = ret >> 32;
379 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
381 LOG("err = %i", err);
382 if( callNum == SYS_EXECVE )
383 LOG("Actual %i", ret);
393 * \fn int Syscall_ValidString(const char *Addr)
394 * \brief Checks if a memory address contains a valid string
396 int Syscall_ValidString(const char *Addr)
398 // Check if the memory is user memory
399 if(!MM_IsUser( (tVAddr) Addr)) return 0;
401 return CheckString( Addr );
405 * \fn int Syscall_Valid(int Size, const void *Addr)
406 * \brief Checks if a memory address is valid
408 int Syscall_Valid(int Size, const void *Addr)
410 if(!MM_IsUser( (tVAddr)Addr )) {
411 Log_Debug("Syscalls", "Syscall_Valid - %p not user", Addr);
415 return CheckMem( Addr, Size );
418 int Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask)
420 tPAddr paddr = MM_GetPhysAddr(Addr);
421 Flags &= MM_PFLAG_RO|MM_PFLAG_EXEC;
422 Mask &= MM_PFLAG_RO|MM_PFLAG_EXEC;
424 //Log_Debug("Syscalls", "SYS_SETFLAGS: %p %x %x", Addr, Flags, Mask);
427 if( (Mask & MM_PFLAG_RO) && !(Flags & MM_PFLAG_RO) ) {
429 // HACK - Assume that RO mmap'd files are immutable
430 if( MM_GetPageNode(paddr, &node) == 0 && node ) {
431 Flags |= MM_PFLAG_COW;
432 Mask |= MM_PFLAG_COW;
435 MM_SetFlags((tVAddr)Addr, Flags, Mask);