armos.c

skyeye的开源代码

	res = read (f, local, len);
	if (res > 0)
		for (i = 0; i < res; i++)
			ARMul_WriteByte (state, ptr + i, local[i]);
	free (local);
	state->Reg[0] = res == -1 ? -1 : len - res;
	OSptr->ErrorNo = errno;
}

static void
SWIwrite (ARMul_State * state, ARMword f, ARMword ptr, ARMword len)
{
	struct OSblock *OSptr = (struct OSblock *) state->OSptr;
	int res;
	ARMword i;
	char *local = malloc (len);

	if (local == NULL) {
		fprintf (stderr,
			 "sim: Unable to write 0x%lx bytes - out of memory\n",
			 (int) len);
		return;
	}

	for (i = 0; i < len; i++)
		local[i] = ARMul_ReadByte (state, ptr + i);

	res = write (f, local, len);
	state->Reg[0] = res == -1 ? -1 : len - res;
	free (local);
	OSptr->ErrorNo = errno;
}

static void
SWIflen (ARMul_State * state, ARMword fh)
{
	struct OSblock *OSptr = (struct OSblock *) state->OSptr;
	ARMword addr;

	if (fh == 0 || fh > FOPEN_MAX) {
		OSptr->ErrorNo = EBADF;
		state->Reg[0] = -1L;
		return;
	}

	addr = lseek (fh, 0, SEEK_CUR);

	state->Reg[0] = lseek (fh, 0L, SEEK_END);
	(void) lseek (fh, addr, SEEK_SET);

	OSptr->ErrorNo = errno;
}

/***************************************************************************\
* The emulator calls this routine when a SWI instruction is encuntered. The *
* parameter passed is the SWI number (lower 24 bits of the instruction).    *
\***************************************************************************/

unsigned
ARMul_OSHandleSWI (ARMul_State * state, ARMword number)
{
	ARMword addr, temp;
	struct OSblock *OSptr = (struct OSblock *) state->OSptr;

	switch (number) {
	case SWI_Read:
		SWIread (state, state->Reg[0], state->Reg[1], state->Reg[2]);
		return TRUE;

	case SWI_Write:
		SWIwrite (state, state->Reg[0], state->Reg[1], state->Reg[2]);
		return TRUE;

	case SWI_Open:
		SWIopen (state, state->Reg[0], state->Reg[1]);
		return TRUE;

	case SWI_Clock:
		/* return number of centi-seconds... */
		state->Reg[0] =
#ifdef CLOCKS_PER_SEC
			(CLOCKS_PER_SEC >= 100)
			? (ARMword) (clock () / (CLOCKS_PER_SEC / 100))
			: (ARMword) ((clock () * 100) / CLOCKS_PER_SEC);
#else
			/* presume unix... clock() returns microseconds */
			(ARMword) (clock () / 10000);
#endif
		OSptr->ErrorNo = errno;
		return (TRUE);

	case SWI_Time:
		state->Reg[0] = (ARMword) time (NULL);
		OSptr->ErrorNo = errno;
		return (TRUE);

	case SWI_Close:
		state->Reg[0] = close (state->Reg[0]);
		OSptr->ErrorNo = errno;
		return TRUE;

	case SWI_Flen:
		SWIflen (state, state->Reg[0]);
		return (TRUE);

	case SWI_Exit:
		state->Emulate = FALSE;
		return TRUE;

	case SWI_Seek:
		{
			/* We must return non-zero for failure */
			state->Reg[0] =
				-1 >= lseek (state->Reg[0], state->Reg[1],
					     SEEK_SET);
			OSptr->ErrorNo = errno;
			return TRUE;
		}

	case SWI_WriteC:
		(void) fputc ((int) state->Reg[0], stdout);
		OSptr->ErrorNo = errno;
		return (TRUE);

	case SWI_Write0:
		SWIWrite0 (state, state->Reg[0]);
		return (TRUE);

	case SWI_GetErrno:
		state->Reg[0] = OSptr->ErrorNo;
		return (TRUE);

	case SWI_Breakpoint:
		//chy 2005-09-12 change below line
		//state->EndCondition = RDIError_BreakpointReached;
		//printf ("SKYEYE: in armos.c : should not come here!!!!\n");
		state->EndCondition = 0;
		/*modified by ksh to support breakpoiont*/
		state->Emulate = STOP;
		return (TRUE);

	case SWI_GetEnv:
		state->Reg[0] = ADDRCMDLINE;
		if (state->MemSize)
			state->Reg[1] = state->MemSize;
		else
			state->Reg[1] = ADDRUSERSTACK;

		WriteCommandLineTo (state, state->Reg[0]);
		return (TRUE);

		/* Handle Angel SWIs as well as Demon ones */
	case AngelSWI_ARM:
	case AngelSWI_Thumb:
		/* R1 is almost always a parameter block */
		addr = state->Reg[1];
		/* R0 is a reason code */
		switch (state->Reg[0]) {
			/* Unimplemented reason codes */
		case AngelSWI_Reason_ReadC:
		case AngelSWI_Reason_IsTTY:
		case AngelSWI_Reason_TmpNam:
		case AngelSWI_Reason_Remove:
		case AngelSWI_Reason_Rename:
		case AngelSWI_Reason_System:
		case AngelSWI_Reason_EnterSVC:
		default:
			state->Emulate = FALSE;
			return (FALSE);

		case AngelSWI_Reason_Clock:
			/* return number of centi-seconds... */
			state->Reg[0] =
#ifdef CLOCKS_PER_SEC
				(CLOCKS_PER_SEC >= 100)
				? (ARMword) (clock () /
					     (CLOCKS_PER_SEC / 100))
				: (ARMword) ((clock () * 100) /
					     CLOCKS_PER_SEC);
#else
				/* presume unix... clock() returns microseconds */
				(ARMword) (clock () / 10000);
#endif
			OSptr->ErrorNo = errno;
			return (TRUE);

		case AngelSWI_Reason_Time:
			state->Reg[0] = (ARMword) time (NULL);
			OSptr->ErrorNo = errno;
			return (TRUE);

		case AngelSWI_Reason_WriteC:
			(void) fputc ((int) ARMul_ReadByte (state, addr),
				      stdout);
			OSptr->ErrorNo = errno;
			return (TRUE);

		case AngelSWI_Reason_Write0:
			SWIWrite0 (state, addr);
			return (TRUE);

		case AngelSWI_Reason_Close:
			state->Reg[0] = close (ARMul_ReadWord (state, addr));
			OSptr->ErrorNo = errno;
			return (TRUE);

		case AngelSWI_Reason_Seek:
			state->Reg[0] =
				-1 >= lseek (ARMul_ReadWord (state, addr),
					     ARMul_ReadWord (state, addr + 4),
					     SEEK_SET);
			OSptr->ErrorNo = errno;
			return (TRUE);

		case AngelSWI_Reason_FLen:
			SWIflen (state, ARMul_ReadWord (state, addr));
			return (TRUE);

		case AngelSWI_Reason_GetCmdLine:
			WriteCommandLineTo (state,
					    ARMul_ReadWord (state, addr));
			return (TRUE);

		case AngelSWI_Reason_HeapInfo:
			/* R1 is a pointer to a pointer */
			addr = ARMul_ReadWord (state, addr);

			/* Pick up the right memory limit */
			if (state->MemSize)
				temp = state->MemSize;
			else
				temp = ADDRUSERSTACK;

			ARMul_WriteWord (state, addr, 0);	/* Heap base */
			ARMul_WriteWord (state, addr + 4, temp);	/* Heap limit */
			ARMul_WriteWord (state, addr + 8, temp);	/* Stack base */
			ARMul_WriteWord (state, addr + 12, temp);	/* Stack limit */
			return (TRUE);

		case AngelSWI_Reason_ReportException:
			if (state->Reg[1] == ADP_Stopped_ApplicationExit)
				state->Reg[0] = 0;
			else
				state->Reg[0] = -1;
			state->Emulate = FALSE;
			return TRUE;

		case ADP_Stopped_ApplicationExit:
			state->Reg[0] = 0;
			state->Emulate = FALSE;
			return (TRUE);

		case ADP_Stopped_RunTimeError:
			state->Reg[0] = -1;
			state->Emulate = FALSE;
			return (TRUE);

		case AngelSWI_Reason_Errno:
			state->Reg[0] = OSptr->ErrorNo;
			return (TRUE);

		case AngelSWI_Reason_Open:
			SWIopen (state,
				 ARMul_ReadWord (state, addr),
				 ARMul_ReadWord (state, addr + 4));
			return TRUE;

		case AngelSWI_Reason_Read:
			SWIread (state,
				 ARMul_ReadWord (state, addr),
				 ARMul_ReadWord (state, addr + 4),
				 ARMul_ReadWord (state, addr + 8));
			return TRUE;

		case AngelSWI_Reason_Write:
			SWIwrite (state,
				  ARMul_ReadWord (state, addr),
				  ARMul_ReadWord (state, addr + 4),
				  ARMul_ReadWord (state, addr + 8));
			return TRUE;
		}

	default:
#if 0
		state->Emulate = FALSE;
#endif
		return (FALSE);
	}
}

#ifndef NOOS
#ifndef ASIM

/***************************************************************************\
* The emulator calls this routine when an Exception occurs.  The second     *
* parameter is the address of the relevant exception vector.  Returning     *
* FALSE from this routine causes the trap to be taken, TRUE causes it to    *
* be ignored (so set state->Emulate to FALSE!).                             *
\***************************************************************************/

unsigned
ARMul_OSException (ARMul_State * state ATTRIBUTE_UNUSED,
		   ARMword vector ATTRIBUTE_UNUSED,
		   ARMword pc ATTRIBUTE_UNUSED)
{				/* don't use this here */
	return (FALSE);
}

#endif


#endif /* NOOS */