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 Uint     Proc_SendMessage(Uint *Err, Uint Dest, Uint Length, void *Data);
  15 extern int      Proc_GetMessage(Uint *Err, Uint *Source, void *Buffer);
  16 extern int      Proc_Execve(char *File, char **ArgV, char **EnvP);
  17 extern Uint     Binary_Load(char *file, Uint *entryPoint);
  18
  19 // === CODE ===
  20 void SyscallHandler(tSyscallRegs *Regs)
  21 {
  22         Uint    ret=0, err=0;
  23         #if DEBUG
  24         ENTER("iThread iNum", gCurrentThread->TID, Regs->Num);
  25         if(Regs->Num < NUM_SYSCALLS)
  26                 LOG("Syscall %s", cSYSCALL_NAMES[Regs->Num]);
  27         LOG("Arg1: 0x%x, Arg2: 0x%x, Arg3: 0x%x", Regs->Arg1, Regs->Arg2, Regs->Arg3);
  28         #endif
  29         switch(Regs->Num)
  30         {
  31         // -- Exit the current thread
  32         case SYS_EXIT:  Proc_Exit();    break;
  33
  34         // -- Put the current thread to sleep
  35         case SYS_SLEEP: Proc_Sleep();   Log(" SyscallHandler: %i is alive", gCurrentThread->TID);       break;
  36
  37         // -- Yield current timeslice
  38         case SYS_YIELD: Proc_Yield();   break;
  39
  40         // -- Clone the current thread
  41         case SYS_CLONE:
  42                 // Call clone system call
  43                 ret = Proc_Clone(&err, Regs->Arg1);
  44                 // Change user stack if requested
  45                 if(ret == 0 && Regs->Arg2)
  46                         Regs->StackPointer = Regs->Arg2;
  47                 break;
  48
  49         // -- Send a signal
  50         case SYS_KILL:
  51                 err = -ENOSYS;
  52                 ret = -1;
  53                 break;
  54
  55         // -- Map an address
  56         case SYS_MAP:   MM_Map(Regs->Arg1, Regs->Arg2); break;
  57         // -- Allocate an address
  58         case SYS_ALLOCATE:      ret = MM_Allocate(Regs->Arg1);  break;
  59         // -- Unmap an address
  60         case SYS_UNMAP:         MM_Deallocate(Regs->Arg1);      break;
  61
  62         // -- Get Thread/Process IDs
  63         case SYS_GETTID:        ret = gCurrentThread->TID;      break;
  64         case SYS_GETPID:        ret = gCurrentThread->TGID;     break;
  65         // -- Get User/Group IDs
  66         case SYS_GETUID:        ret = gCurrentThread->UID;      break;
  67         case SYS_GETGID:        ret = gCurrentThread->GID;      break;
  68
  69         // -- Send Message
  70         case SYS_SENDMSG:
  71                 ret = Proc_SendMessage(&err, Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3);
  72                 break;
  73         // -- Check for messages
  74         case SYS_GETMSG:
  75                 ret = Proc_GetMessage(&err, (Uint*)Regs->Arg1, (void*)Regs->Arg2);
  76                 break;
  77
  78         // -- Set the thread's name
  79         case SYS_SETNAME:
  80                 // Sanity Check
  81                 if(!Regs->Arg1) {       ret = -1;       err = -EINVAL;  break;  }
  82                 // Lock Process
  83                 LOCK( &gCurrentThread->IsLocked );
  84                 // Free old name
  85                 if(gCurrentThread->ThreadName && (Uint)gCurrentThread->ThreadName > 0xE0800000)
  86                         free(gCurrentThread->ThreadName);
  87                 // Change name
  88                 gCurrentThread->ThreadName = malloc( strlen( (char*)Regs->Arg1 ) + 1 );
  89                 strcpy(gCurrentThread->ThreadName, (char*)Regs->Arg1);
  90                 // Unlock
  91                 RELEASE( &gCurrentThread->IsLocked );
  92                 break;
  93
  94         // ---
  95         // Binary Control
  96         // ---
  97         case SYS_EXECVE:
  98                 ret = Proc_Execve((char*)Regs->Arg1, (char**)Regs->Arg2, (char**)Regs->Arg3);
  99                 break;
 100         case SYS_LOADBIN:
 101                 ret = Binary_Load((char*)Regs->Arg1, (Uint*)Regs->Arg2);
 102                 break;
 103
 104         // ---
 105         // Virtual Filesystem
 106         // ---
 107         case SYS_OPEN:
 108                 ret = VFS_Open((char*)Regs->Arg1, Regs->Arg2 | VFS_OPENFLAG_USER);
 109                 break;
 110
 111         case SYS_CLOSE:
 112                 VFS_Close( Regs->Arg1 );
 113                 break;
 114
 115         case SYS_WRITE:
 116                 #if BITS < 64
 117                 VFS_Write( Regs->Arg1, Regs->Arg2|((Uint64)Regs->Arg3<<32), (void*)Regs->Arg4 );
 118                 #else
 119                 VFS_Write( Regs->Arg1, Regs->Arg2, (void*)Regs->Arg3 );
 120                 #endif
 121                 break;
 122
 123
 124         // -- Debug
 125         case SYS_DEBUG:
 126                 Log((char*)Regs->Arg1,
 127                         Regs->Arg2, Regs->Arg3, Regs->Arg4, Regs->Arg5, Regs->Arg6);
 128                 break;
 129
 130         // -- Default (Return Error)
 131         default:
 132                 Warning("SyscallHandler: Unknown System Call %i", Regs->Num);
 133                 if(Regs->Num < NUM_SYSCALLS)
 134                         Warning(" Syscall %s", cSYSCALL_NAMES[Regs->Num]);
 135                 err = -ENOSYS;
 136                 ret = -1;
 137                 break;
 138         }
 139         Regs->Return = ret;
 140         Regs->Error = err;
 141         #if DEBUG
 142         LOG("SyscallHandler: err = %i", err);
 143         LEAVE('x', ret);
 144         #endif
 145 }
 146