Kernel/syscalls.c

   1 /*
   2  * AcessOS Microkernel Version
   3  * syscalls.c
   4  */
   5 #define DEBUG   0
   6
   7 #include <common.h>
   8 #include <syscalls.h>
   9 #include <proc.h>
  10 #include <errno.h>
  11
  12 // === IMPORTS ===
  13 extern int      Proc_Clone(Uint *Err, Uint Flags);
  14 extern int      Threads_WaitTID(int TID, int *status);
  15 extern Uint     Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
  16 extern int      Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
  17 extern int      Proc_Execve(char *File, char **ArgV, char **EnvP);
  18 extern Uint     Binary_Load(char *file, Uint *entryPoint);
  19 extern int      VFS_FInfo(int FD, void *Dest, int MaxACLs);
  20 extern int      VFS_GetACL(int FD, void *Dest);
  21 extern int      Threads_SetName(char *NewName);
  22 extern int      Threads_GetPID();
  23 extern int      Threads_GetTID();
  24 extern int      Threads_GetUID();
  25 extern int      Threads_GetGID();
  26
  27 // === CODE ===
  28 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
  29 void SyscallHandler(tSyscallRegs *Regs)
  30 {
  31         Uint64  ret = 0;
  32         Uint    err = 0;
  33         #if DEBUG
  34         ENTER("iThread iNum", Threads_GetTID(), Regs->Num);
  35         if(Regs->Num < NUM_SYSCALLS)
  36                 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
  37         LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3);
  38         #endif
  39         switch(Regs->Num)
  40         {
  41         // -- Exit the current thread
  42         case SYS_EXIT:  Threads_Exit(); break;
  43
  44         // -- Put the current thread to sleep
  45         case SYS_SLEEP: Threads_Sleep();        break;
  46
  47         // -- Yield current timeslice
  48         case SYS_YIELD: Threads_Yield();        break;
  49
  50         // -- Clone the current thread
  51         case SYS_CLONE:
  52                 // Call clone system call
  53                 ret = Proc_Clone(&err, Regs->Arg1);
  54                 // Change user stack if requested
  55                 if(ret == 0 && Regs->Arg2)
  56                         Regs->StackPointer = Regs->Arg2;
  57                 break;
  58
  59         // -- Send a signal
  60         case SYS_KILL:
  61                 err = -ENOSYS;
  62                 ret = -1;
  63                 break;
  64
  65         // -- Wait for a thread
  66         case SYS_WAITTID:
  67                 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
  68                 break;
  69
  70         // -- Get the physical address of a page
  71         case SYS_GETPHYS:
  72                 ret = MM_GetPhysAddr(Regs->Arg1);
  73                 break;
  74
  75         // -- Map an address
  76         case SYS_MAP:   MM_Map(Regs->Arg1, Regs->Arg2); break;
  77
  78         // -- Allocate an address
  79         case SYS_ALLOCATE:      ret = MM_Allocate(Regs->Arg1);  break;
  80
  81         // -- Unmap an address
  82         case SYS_UNMAP:         MM_Deallocate(Regs->Arg1);      break;
  83
  84         // -- Get Thread/Process IDs
  85         case SYS_GETTID:        ret = Threads_GetTID(); break;
  86         case SYS_GETPID:        ret = Threads_GetPID(); break;
  87
  88         // -- Get User/Group IDs
  89         case SYS_GETUID:        ret = Threads_GetUID(); break;
  90         case SYS_GETGID:        ret = Threads_GetGID(); break;
  91
  92         // -- Send Message
  93         case SYS_SENDMSG:
  94                 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
  95                 break;
  96         // -- Check for messages
  97         case SYS_GETMSG:
  98                 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
  99                 break;
 100
 101         // -- Set the thread's name
 102         case SYS_SETNAME:
 103                 // Sanity Check
 104                 if(!Regs->Arg1) {       ret = -1;       err = -EINVAL;  break;  }
 105                 Threads_SetName( (void*)Regs->Arg1 );
 106                 break;
 107
 108         // ---
 109         // Binary Control
 110         // ---
 111         case SYS_EXECVE:
 112                 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
 113                 break;
 114         case SYS_LOADBIN:
 115                 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
 116                 break;
 117
 118         // ---
 119         // Virtual Filesystem
 120         // ---
 121         case SYS_OPEN:
 122                 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
 123                 break;
 124
 125         case SYS_CLOSE:
 126                 VFS_Close( Regs->Arg1 );
 127                 break;
 128
 129         case SYS_WRITE:
 130                 #if BITS < 64
 131                 VFS_Write( Regs->Arg1, Regs->Arg2|((Uint64)Regs->Arg3<<32), (void*)Regs->Arg4 );
 132                 #else
 133                 VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
 134                 #endif
 135                 break;
 136
 137         case SYS_READ:
 138                 #if BITS < 64
 139                 VFS_Read( Regs->Arg1, Regs->Arg2|((Uint64)Regs->Arg3<<32), (void*)Regs->Arg4 );
 140                 #else
 141                 VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
 142                 #endif
 143                 break;
 144
 145         case SYS_FINFO:
 146                 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
 147                 break;
 148
 149         case SYS_GETACL:
 150                 ret = VFS_GetACL( Regs->Arg1, (void*)Regs->Arg2 );
 151                 break;
 152
 153         case SYS_READDIR:
 154                 ret = VFS_ReadDir( Regs->Arg1, (void*)Regs->Arg2 );
 155                 break;
 156
 157         // -- Debug
 158         case SYS_DEBUG:
 159                 Log((char*)Regs->Arg1,
 160                         Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
 161                 break;
 162
 163         // -- Default (Return Error)
 164         default:
 165                 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
 166                 if(Regs->Num < NUM_SYSCALLS)
 167                         Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
 168                 err = -ENOSYS;
 169                 ret = -1;
 170                 break;
 171         }
 172         #if BITS < 64
 173         Regs->Return = ret&0xFFFFFFFF;
 174         Regs->RetHi = ret >> 32;
 175         #else
 176         Regs->Return = ret;
 177         #endif
 178         Regs->Error = err;
 179         #if DEBUG
 180         LOG("SyscallHandler: err = %i", err);
 181         LEAVE('x', ret);
 182         #endif
 183 }
 184