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;
77 Time_Delay(Regs->Arg1);
80 // -- Yield current timeslice
81 case SYS_YIELD: Threads_Yield(); break;
83 // -- Set Error Handler
84 case SYS_SETFAULTHANDLER:
85 Threads_SetFaultHandler(Regs->Arg1);
88 // -- Clone the current thread
90 // Call clone system call
91 ret = Proc_Clone(Regs->Arg1);
100 // -- Wait fr an event
103 ret = Threads_WaitEvents(Regs->Arg1);
106 // -- Wait for a thread
108 // Sanity Check (Status can be NULL)
109 CHECK_NUM_NULLOK( (int*)Regs->Arg2, sizeof(int) );
111 ret = Threads_WaitTID(Regs->Arg1, (int*)Regs->Arg2);
114 // -- Get the physical address of a page
116 ret = MM_GetPhysAddr( (void*)Regs->Arg1 );
120 case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
122 // -- Allocate an address
123 case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
125 // -- Unmap an address
126 case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
128 // -- Change the protection on an address
130 ret = Syscall_MM_SetFlags((void*)Regs->Arg1, Regs->Arg2, Regs->Arg3);
133 // -- Get Thread/Process IDs
134 case SYS_GETTID: ret = Threads_GetTID(); break;
135 case SYS_GETPID: ret = Threads_GetPID(); break;
137 // -- Get User/Group IDs
138 case SYS_GETUID: ret = Threads_GetUID(); break;
139 case SYS_GETGID: ret = Threads_GetGID(); break;
141 // -- Set User/Group IDs
142 case SYS_SETUID: ret = Threads_SetUID(Regs->Arg1); break;
143 case SYS_SETGID: ret = Threads_SetGID(Regs->Arg1); break;
147 CHECK_NUM_NONULL( (void*)Regs->Arg3, Regs->Arg2 );
148 // Destination, Size, *Data
149 ret = Proc_SendMessage(Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
151 // -- Check for messages
153 CHECK_NUM_NULLOK( (Uint*)Regs->Arg1, sizeof(Uint) );
154 if( Regs->Arg3 != -1 )
155 CHECK_NUM_NULLOK((void*)Regs->Arg3, Regs->Arg2);
157 ret = Proc_GetMessage((Uint*)Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
160 // -- Get the current timestamp
165 // -- Set the thread's name
167 CHECK_STR_NONULL( (char*) Regs->Arg1);
168 Threads_SetName( (char*)Regs->Arg1 );
174 // -- Create a new process
176 CHECK_STR_NONULL((const char*)Regs->Arg1);
177 CHECK_STR_ARRAY((const char**)Regs->Arg2);
178 CHECK_STR_ARRAY((const char**)Regs->Arg3);
180 CHECK_NUM_NONULL((void*)Regs->Arg5, Regs->Arg4*sizeof(int));
182 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
183 Regs->Arg4, (int*)Regs->Arg5
186 // -- Replace the current process with another
188 CHECK_STR_NONULL((char*)Regs->Arg1);
189 CHECK_STR_ARRAY( (char**)Regs->Arg2 );
191 CHECK_STR_ARRAY( (char**)Regs->Arg3 );
192 LEAVE('s', "Assuming 0");
193 // Path, **Argv, **Envp, DataSize (=0 to tell it to create a copy)
195 (const char*)Regs->Arg1, (const char**)Regs->Arg2, (const char**)Regs->Arg3,
199 // -- Load a binary into the current process
201 CHECK_STR_NONULL( (char*)Regs->Arg1 );
202 CHECK_NUM_NONULL( (Uint*)Regs->Arg2, sizeof(Uint) );
204 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
208 // Virtual Filesystem
211 CHECK_STR_NONULL( (char*)Regs->Arg1 );
212 LOG("VFS_Open(\"%s\", 0x%x)", (char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
213 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
216 CHECK_STR_NONULL( (char*)Regs->Arg2 );
217 LOG("VFS_Reopen(%i, \"%s\", 0x%x)", Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
218 ret = VFS_Reopen(Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
222 LOG("VFS_Close(%i)", Regs->Arg1);
223 VFS_Close( Regs->Arg1 );
227 LOG("VFS_DuplicateFD(%i,%i)", Regs->Arg1, Regs->Arg2);
228 ret = VFS_DuplicateFD(Regs->Arg1, Regs->Arg2);
232 LOG("VFS_SetFDFlags(%i,0%o,0%o)", Regs->Arg1, Regs->Arg2, Regs->Arg3);
233 ret = VFS_SetFDFlags(Regs->Arg1, Regs->Arg2, Regs->Arg3);
238 ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
240 ret = VFS_Seek( Regs->Arg1, Regs->Arg2|(((Uint64)Regs->Arg3)<<32), Regs->Arg4 );
245 ret = VFS_Tell( Regs->Arg1 );
249 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
250 ret = VFS_Write( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
254 CHECK_NUM_NONULL( (void*)Regs->Arg2, Regs->Arg3 );
255 ret = VFS_Read( Regs->Arg1, Regs->Arg3, (void*)Regs->Arg2 );
259 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
261 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
266 CHECK_NUM_NONULL( (void*)Regs->Arg2, sizeof(tVFS_ACL) );
267 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
272 // TODO: What if the filename is longer?
273 // Maybe force it to be a 256 byte buffer
274 CHECK_NUM_NONULL( (void*)Regs->Arg2, 256 );
275 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
278 // Open a file that is a entry in an open directory
280 CHECK_STR_NONULL( (char*)Regs->Arg2 );
281 ret = VFS_OpenChild( Regs->Arg1, (char*)Regs->Arg2, Regs->Arg3 | VFS_OPENFLAG_USER);
286 CHECK_STR_NONULL( (const char*)Regs->Arg1 );
287 ret = VFS_ChDir( (const char*)Regs->Arg1 );
292 // All sanity checking should be done by the driver
293 if( Regs->Arg3 && !MM_IsUser(Regs->Arg3) ) {
294 MERR("IOCtl Invalid arg %p", Regs->Arg3);
295 err = -EINVAL; ret = -1; break;
297 ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
300 // Mount a filesystem
302 // Only root can mount filesystems
303 if(Threads_GetUID() != 0) {
311 if( !Syscall_ValidString((char*)Regs->Arg2) ) {
317 ret = VFS_Unmount((char*)Regs->Arg2);
321 // Sanity check the paths
322 CHECK_STR_NONULL((char*)Regs->Arg1);
323 CHECK_STR_NONULL((char*)Regs->Arg2);
324 CHECK_STR_NULLOK((char*)Regs->Arg3);
325 CHECK_STR_NONULL((char*)Regs->Arg4);
327 (char*)Regs->Arg1, // Device
328 (char*)Regs->Arg2, // Mount point
329 (char*)Regs->Arg3, // Filesystem
330 (char*)Regs->Arg4 // Options
335 // Wait on a set of handles
338 if( (Regs->Arg2 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg2))
339 || (Regs->Arg3 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg3))
340 || (Regs->Arg4 && !Syscall_Valid(sizeof(fd_set), (void*)Regs->Arg4))
341 || (Regs->Arg5 && !Syscall_Valid(sizeof(tTime), (void*)Regs->Arg5)) )
349 Regs->Arg1, // Max handle
350 (fd_set *)Regs->Arg2, // Read
351 (fd_set *)Regs->Arg3, // Write
352 (fd_set *)Regs->Arg4, // Errors
353 (tTime *)Regs->Arg5, // Timeout
354 (Uint32)Regs->Arg6, // Extra wakeup events
360 // Create a directory
362 CHECK_STR_NONULL( (char*)Regs->Arg1 );
363 ret = VFS_MkDir( (char*)Regs->Arg1 );
367 Log_Error("Syscalls", "TODO: Impliment SYS_UNLINK");
372 CHECK_STR_NONULL( (char*)Regs->Arg1 );
373 LogF("Log: %08lli [%i] ", now(), Threads_GetTID());
374 LogF((const char*)Regs->Arg1,
375 Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
380 // -- Default (Return Error)
382 Log_Warning("Syscalls", "Unknown System Call %i", Regs->Num);
383 if(Regs->Num < NUM_SYSCALLS)
384 Log_Warning("Syscall", " named '%s'", cSYSCALL_NAMES[Regs->Num]);
390 if(err == 0) err = errno;
393 LOG("ID: %i, Return errno = %i", Regs->Num, err);
397 Regs->Return = ret&0xFFFFFFFF;
398 Regs->RetHi = ret >> 32;
405 if( callNum != SYS_READ && callNum != SYS_WRITE ) {
407 LOG("err = %i", err);
408 if( callNum == SYS_EXECVE )
409 LOG("Actual %i", ret);
419 * \fn int Syscall_ValidString(const char *Addr)
420 * \brief Checks if a memory address contains a valid string
422 int Syscall_ValidString(const char *Addr)
424 // Check if the memory is user memory
425 if(!MM_IsUser( (tVAddr) Addr)) return 0;
427 return CheckString( Addr );
431 * \fn int Syscall_Valid(int Size, const void *Addr)
432 * \brief Checks if a memory address is valid
434 int Syscall_Valid(int Size, const void *Addr)
436 if(!MM_IsUser( (tVAddr)Addr )) {
437 Log_Debug("Syscalls", "Syscall_Valid - %p not user", Addr);
441 return CheckMem( Addr, Size );
444 int Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask)
446 tPAddr paddr = MM_GetPhysAddr(Addr);
447 Flags &= MM_PFLAG_RO|MM_PFLAG_EXEC;
448 Mask &= MM_PFLAG_RO|MM_PFLAG_EXEC;
450 //Log_Debug("Syscalls", "SYS_SETFLAGS: %p %x %x", Addr, Flags, Mask);
453 if( (Mask & MM_PFLAG_RO) && !(Flags & MM_PFLAG_RO) ) {
455 // HACK - Assume that RO mmap'd files are immutable
456 if( MM_GetPageNode(paddr, &node) == 0 && node ) {
457 Flags |= MM_PFLAG_COW;
458 Mask |= MM_PFLAG_COW;
461 MM_SetFlags((tVAddr)Addr, Flags, Mask);