+++ /dev/null
-/*
- * AcessOS Microkernel Version
- * syscalls.c
- */
-#define DEBUG 0
-
-#include <acess.h>
-#include <syscalls.h>
-#include <proc.h>
-#include <errno.h>
-
-#define CHECK_NUM_NULLOK(v,size) \
- if((v)&&!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
-#define CHECK_STR_NULLOK(v) \
- if((v)&&!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
-#define CHECK_NUM_NONULL(v,size) \
- if(!(v)||!Syscall_Valid((size),(Uint)(v))){ret=-1;err=-EINVAL;break;}
-#define CHECK_STR_NONULL(v) \
- if(!(v)||!Syscall_ValidString((Uint)(v))){ret=-1;err=-EINVAL;break;}
-
-// === IMPORTS ===
-extern int Proc_Clone(Uint *Err, Uint Flags);
-extern int Threads_WaitTID(int TID, int *status);
-extern Uint Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
-extern int Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
-extern int Proc_Execve(char *File, char **ArgV, char **EnvP);
-extern Uint Binary_Load(char *file, Uint *entryPoint);
-extern int Threads_SetName(char *NewName);
-extern int Threads_GetPID();
-extern int Threads_GetTID();
-extern int Threads_GetUID();
-extern int Threads_GetGID();
-
-// === PROTOTYPES ===
- int Syscall_ValidString(Uint Addr);
- int Syscall_Valid(int Size, Uint Addr);
-
-// === CODE ===
-// TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
-void SyscallHandler(tSyscallRegs *Regs)
-{
- Uint64 ret = 0;
- Uint err = 0;
-
- ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
- if(Regs->Num < NUM_SYSCALLS)
- LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
- LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x, Arg4: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3, Regs->Arg4);
-
- switch(Regs->Num)
- {
- // -- Exit the current thread
- case SYS_EXIT: Threads_Exit(0, Regs->Arg1); break;
-
- // -- Put the current thread to sleep
- case SYS_SLEEP: Threads_Sleep(); break;
-
- // -- Yield current timeslice
- case SYS_YIELD: Threads_Yield(); break;
-
- // -- Clone the current thread
- case SYS_CLONE:
- // Call clone system call
- ret = Proc_Clone(&err, Regs->Arg1);
- // Change user stack if a new stack address is passed
- if(ret == 0 && Regs->Arg2)
- Regs->StackPointer = Regs->Arg2;
- break;
-
- // -- Send a signal
- case SYS_KILL:
- err = -ENOSYS;
- ret = -1;
- break;
-
- // -- Wait for a thread
- case SYS_WAITTID:
- // Sanity Check (Status can be NULL)
- CHECK_NUM_NULLOK( Regs->Arg2, sizeof(int) );
- // TID, *Status
- ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
- break;
-
- // -- Get the physical address of a page
- case SYS_GETPHYS:
- ret = MM_GetPhysAddr(Regs->Arg1);
- break;
-
- // -- Map an address
- case SYS_MAP: MM_Map(Regs->Arg1, Regs->Arg2); break;
-
- // -- Allocate an address
- case SYS_ALLOCATE: ret = MM_Allocate(Regs->Arg1); break;
-
- // -- Unmap an address
- case SYS_UNMAP: MM_Deallocate(Regs->Arg1); break;
-
- // -- Get Thread/Process IDs
- case SYS_GETTID: ret = Threads_GetTID(); break;
- case SYS_GETPID: ret = Threads_GetPID(); break;
-
- // -- Get User/Group IDs
- case SYS_GETUID: ret = Threads_GetUID(); break;
- case SYS_GETGID: ret = Threads_GetGID(); break;
-
- // -- Set User/Group IDs
- case SYS_SETUID: Log("Setting User ID to %i", Regs->Arg1); break;
- case SYS_SETGID: Log("Setting Group ID to %i", Regs->Arg1); break;
-
- // -- Send Message
- case SYS_SENDMSG:
- CHECK_NUM_NONULL(Regs->Arg3, Regs->Arg2);
- // Destination, Size, *Data
- ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
- break;
- // -- Check for messages
- case SYS_GETMSG:
- CHECK_NUM_NULLOK(Regs->Arg1, sizeof(Uint));
- //NOTE: Uncertain due to length being unknown
- // (Proc_GetMessage should check itself)
- CHECK_NUM_NULLOK(Regs->Arg2, sizeof(Uint)*4);
- // *Source, *Data
- ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
- break;
-
- // -- Set the thread's name
- case SYS_SETNAME:
- CHECK_STR_NONULL(Regs->Arg1);
- Threads_SetName( (char*)Regs->Arg1 );
- break;
-
- // ---
- // Binary Control
- // ---
- case SYS_EXECVE:
- CHECK_STR_NONULL(Regs->Arg1);
- //Log(" Regs = {Arg2: %x, Arg3: %x}", Regs->Arg2, Regs->Arg3);
- {
- int i;
- char **tmp = (char**)Regs->Arg2;
- // Check ArgV (traverse array checking all string pointers)
- CHECK_NUM_NONULL( tmp, sizeof(char**) );
- //Log("tmp = %p", tmp);
- for(i=0;tmp[i];i++) {
- CHECK_NUM_NONULL( &tmp[i], sizeof(char*) );
- CHECK_STR_NONULL( tmp[i] );
- }
- // Check EnvP also
- // - EnvP can be NULL
- if( Regs->Arg3 )
- {
- tmp = (char**)Regs->Arg3;
- //Log("tmp = %p", tmp);
- for(i=0;tmp[i];i++) {
- CHECK_NUM_NULLOK( &tmp[i], sizeof(char*) );
- CHECK_STR_NONULL( tmp[i] );
- }
- }
- }
- LEAVE('s', "Assuming 0");
- // Path, **Argv, **Envp
- ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
- break;
- case SYS_LOADBIN:
- if( !Syscall_ValidString(Regs->Arg1)
- || !Syscall_Valid(sizeof(Uint), Regs->Arg2) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- // Path, *Entrypoint
- ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
- break;
-
- // ---
- // Virtual Filesystem
- // ---
- case SYS_OPEN:
- if( !Syscall_ValidString(Regs->Arg1) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
- break;
-
- case SYS_CLOSE:
- VFS_Close( Regs->Arg1 );
- break;
-
- case SYS_SEEK:
- ret = VFS_Seek( Regs->Arg1, Regs->Arg2, Regs->Arg3 );
- break;
-
- case SYS_TELL:
- ret = VFS_Tell( Regs->Arg1 );
- break;
-
- case SYS_WRITE:
- CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
- ret = VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
- break;
-
- case SYS_READ:
- CHECK_NUM_NONULL( Regs->Arg3, Regs->Arg2 );
- ret = VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
- break;
-
- case SYS_FINFO:
- CHECK_NUM_NONULL( Regs->Arg2, sizeof(tFInfo) + Regs->Arg3*sizeof(tVFS_ACL) );
- // FP, Dest, MaxACLs
- ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
- break;
-
- // Get ACL Value
- case SYS_GETACL:
- if( !Syscall_Valid(sizeof(tVFS_ACL), Regs->Arg1) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
- break;
-
- // Read Directory
- case SYS_READDIR:
- if( !Syscall_Valid(8, Regs->Arg2) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
- break;
-
- // Change Directory
- case SYS_CHDIR:
- if( !Syscall_ValidString(Regs->Arg1) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- ret = VFS_ChDir( (void*)Regs->Arg1 );
- break;
-
- // IO Control
- case SYS_IOCTL:
- // All sanity checking should be done by the driver
- ret = VFS_IOCtl( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
- break;
-
- // Mount a filesystem
- case SYS_MOUNT:
- // Only root can mount filesystems
- if(Threads_GetUID() != 0) {
- err = -EACCES;
- ret = -1;
- break;
- }
- // Sanity check the paths
- if(!Syscall_ValidString(Regs->Arg1)
- || !Syscall_ValidString(Regs->Arg2)
- || !Syscall_ValidString(Regs->Arg3)
- || !Syscall_ValidString(Regs->Arg4) ) {
- err = -EINVAL;
- ret = -1;
- break;
- }
- ret = VFS_Mount(
- (char*)Regs->Arg1, // Device
- (char*)Regs->Arg2, // Mount point
- (char*)Regs->Arg3, // Filesystem
- (char*)Regs->Arg4 // Options
- );
- break;
-
- // -- Debug
- //#if DEBUG_BUILD
- case SYS_DEBUG:
- Log((char*)Regs->Arg1,
- Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
- break;
- //#endif
-
- // -- Default (Return Error)
- default:
- Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
- if(Regs->Num < NUM_SYSCALLS)
- Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
- err = -ENOSYS;
- ret = -1;
- break;
- }
-
- if(err != 0) {
- LOG("ID: %i, Return errno = %i", Regs->Num, err);
- }
-
- #if BITS < 64
- Regs->Return = ret&0xFFFFFFFF;
- Regs->RetHi = ret >> 32;
- #else
- Regs->Return = ret;
- #endif
- Regs->Error = err;
- #if DEBUG
- LOG("err = %i", err);
- if(Regs->Num != SYS_EXECVE)
- LEAVE('x', ret);
- else
- LOG("Actual %i", ret);
- #endif
-}
-
-/**
- * \fn int Syscall_ValidString(Uint Addr)
- * \brief Checks if a memory address contains a valid string
- */
-int Syscall_ValidString(Uint Addr)
-{
- // Check if the memory is user memory
- if(!MM_IsUser(Addr)) return 0;
-
- return CheckString( (char*)Addr );
-}
-
-/**
- * \fn int Syscall_Valid(int Size, Uint Addr)
- * \brief Checks if a memory address is valid
- */
-int Syscall_Valid(int Size, Uint Addr)
-{
- if(!MM_IsUser(Addr)) return 0;
-
- return CheckMem( (void*)Addr, Size );
-}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au