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      Threads_SetName(char *NewName);
  21 extern int      Threads_GetPID();
  22 extern int      Threads_GetTID();
  23 extern int      Threads_GetUID();
  24 extern int      Threads_GetGID();
  25
  26 // === CODE ===
  27 void SyscallHandler(tSyscallRegs *Regs)
  28 {
  29         Uint64  ret = 0;
  30         Uint    err = 0;
  31         #if DEBUG
  32         ENTER("iThread iNum", gCurrentThread->TID, Regs->Num);
  33         if(Regs->Num < NUM_SYSCALLS)
  34                 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
  35         LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3);
  36         #endif
  37         switch(Regs->Num)
  38         {
  39         // -- Exit the current thread
  40         case SYS_EXIT:  Threads_Exit(); break;
  41
  42         // -- Put the current thread to sleep
  43         case SYS_SLEEP: Threads_Sleep();        break;
  44
  45         // -- Yield current timeslice
  46         case SYS_YIELD: Threads_Yield();        break;
  47
  48         // -- Clone the current thread
  49         case SYS_CLONE:
  50                 // Call clone system call
  51                 ret = Proc_Clone(&err, Regs->Arg1);
  52                 // Change user stack if requested
  53                 if(ret == 0 && Regs->Arg2)
  54                         Regs->StackPointer = Regs->Arg2;
  55                 break;
  56
  57         // -- Send a signal
  58         case SYS_KILL:
  59                 err = -ENOSYS;
  60                 ret = -1;
  61                 break;
  62
  63         // -- Wait for a thread
  64         case SYS_WAITTID:
  65                 ret = Threads_WaitTID(Regs->Arg1, (void*)Regs->Arg2);
  66                 break;
  67
  68         case SYS_GETPHYS:
  69                 ret = MM_GetPhysAddr(Regs->Arg1);
  70                 break;
  71         // -- Map an address
  72         case SYS_MAP:   MM_Map(Regs->Arg1, Regs->Arg2); break;
  73         // -- Allocate an address
  74         case SYS_ALLOCATE:      ret = MM_Allocate(Regs->Arg1);  break;
  75         // -- Unmap an address
  76         case SYS_UNMAP:         MM_Deallocate(Regs->Arg1);      break;
  77
  78         // -- Get Thread/Process IDs
  79         case SYS_GETTID:        ret = Threads_GetTID(); break;
  80         case SYS_GETPID:        ret = Threads_GetPID(); break;
  81         // -- Get User/Group IDs
  82         case SYS_GETUID:        ret = Threads_GetUID(); break;
  83         case SYS_GETGID:        ret = Threads_GetGID(); break;
  84
  85         // -- Send Message
  86         case SYS_SENDMSG:
  87                 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
  88                 break;
  89         // -- Check for messages
  90         case SYS_GETMSG:
  91                 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
  92                 break;
  93
  94         // -- Set the thread's name
  95         case SYS_SETNAME:
  96                 // Sanity Check
  97                 if(!Regs->Arg1) {       ret = -1;       err = -EINVAL;  break;  }
  98                 Threads_SetName( (void*)Regs->Arg1 );
  99                 break;
 100
 101         // ---
 102         // Binary Control
 103         // ---
 104         case SYS_EXECVE:
 105                 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
 106                 break;
 107         case SYS_LOADBIN:
 108                 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
 109                 break;
 110
 111         // ---
 112         // Virtual Filesystem
 113         // ---
 114         case SYS_OPEN:
 115                 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
 116                 break;
 117
 118         case SYS_CLOSE:
 119                 VFS_Close( Regs->Arg1 );
 120                 break;
 121
 122         case SYS_WRITE:
 123                 #if BITS < 64
 124                 VFS_Write( Regs->Arg1, Regs->Arg2|((Uint64)Regs->Arg3<<32), (void*)Regs->Arg4 );
 125                 #else
 126                 VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
 127                 #endif
 128                 break;
 129
 130         case SYS_READ:
 131                 #if BITS < 64
 132                 VFS_Read( Regs->Arg1, Regs->Arg2|((Uint64)Regs->Arg3<<32), (void*)Regs->Arg4 );
 133                 #else
 134                 VFS_Read( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
 135                 #endif
 136                 break;
 137
 138         case SYS_FINFO:
 139                 ret = VFS_FInfo( Regs->Arg1, (void*)Regs->Arg2, Regs->Arg3 );
 140                 break;
 141
 142         // -- Debug
 143         case SYS_DEBUG:
 144                 Log((char*)Regs->Arg1,
 145                         Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
 146                 break;
 147
 148         // -- Default (Return Error)
 149         default:
 150                 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
 151                 if(Regs->Num < NUM_SYSCALLS)
 152                         Warning(" Syscall '%s'", cSYSCALL_NAMES[Regs->Num]);
 153                 err = -ENOSYS;
 154                 ret = -1;
 155                 break;
 156         }
 157         #if BITS < 64
 158         Regs->Return = ret&0xFFFFFFFF;
 159         Regs->RetHi = ret >> 32;
 160         #else
 161         Regs->Return = ret;
 162         #endif
 163         Regs->Error = err;
 164         #if DEBUG
 165         LOG("SyscallHandler: err = %i", err);
 166         LEAVE('x', ret);
 167         #endif
 168 }
 169