path: root/arch/m68k/ifpsp060/iskeleton.S

|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
|M68060 Software Package Copyright © 1993, 1994 Motorola Inc.  All rights reserved.
|
|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
|To the maximum extent permitted by applicable law,
|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
|and any warranty against infringement with regard to the SOFTWARE
|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
|
|To the maximum extent permitted by applicable law,
|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
|
|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
|so long as this entire notice is retained without alteration in any modified and/or
|redistributed versions, and that such modified versions are clearly identified as such.
|No licenses are granted by implication, estoppel or otherwise under any patents
|or trademarks of Motorola, Inc.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| iskeleton.s
|
| This file contains:
|	(1) example "Call-out"s
|	(2) example package entry code
|	(3) example "Call-out" table
|

#include <linux/linkage.h>
#include <asm/entry.h>
#include <asm/asm-offsets.h>


|################################
| (1) EXAMPLE CALL-OUTS		#
|				#
| _060_isp_done()		#
| _060_real_chk()		#
| _060_real_divbyzero()		#
|				#
| _060_real_cas()		#
| _060_real_cas2()		#
| _060_real_lock_page()		#
| _060_real_unlock_page()	#
|################################

|
| _060_isp_done():
|
| This is and example main exit point for the Unimplemented Integer
| Instruction exception handler. For a normal exit, the
| _isp_unimp() branches to here so that the operating system
| can do any clean-up desired. The stack frame is the
| Unimplemented Integer Instruction stack frame with
| the PC pointing to the instruction following the instruction
| just emulated.
| To simply continue execution at the next instruction, just
| do an "rte".
|
| Linux/68k: If returning to user space, check for needed reselections.

	.global		_060_isp_done
_060_isp_done:
	btst	#0x5,%sp@		| supervisor bit set in saved SR?
	beq	.Lnotkern
	rte
.Lnotkern:
	SAVE_ALL_INT
	GET_CURRENT(%d0)
	| deliver signals, reschedule etc..
	jra	ret_from_exception

|
| _060_real_chk():
|
| This is an alternate exit point for the Unimplemented Integer
| Instruction exception handler. If the instruction was a "chk2"
| and the operand was out of bounds, then _isp_unimp() creates
| a CHK exception stack frame from the Unimplemented Integer Instrcution
| stack frame and branches to this routine.
|
| Linux/68k: commented out test for tracing

	.global		_060_real_chk
_060_real_chk:
|	tst.b		(%sp)			| is tracing enabled?
|	bpls		real_chk_end		| no

|
|	    CHK FRAME		   TRACE FRAME
|	*****************	*****************
|	*   Current PC	*	*   Current PC	*
|	*****************	*****************
|	* 0x2 *  0x018	*	* 0x2 *  0x024	*
|	*****************	*****************
|	*     Next	*	*     Next	*
|	*      PC	*	*      PC	*
|	*****************	*****************
|	*      SR	*	*      SR	*
|	*****************	*****************
|
|	move.b		#0x24,0x7(%sp)		| set trace vecno
|	bral		_060_real_trace

real_chk_end:
	bral		trap			| jump to trap handler

|
| _060_real_divbyzero:
|
| This is an alternate exit point for the Unimplemented Integer
| Instruction exception handler isp_unimp(). If the instruction is a 64-bit
| integer divide where the source operand is a zero, then the _isp_unimp()
| creates a Divide-by-zero exception stack frame from the Unimplemented
| Integer Instruction stack frame and branches to this routine.
|
| Remember that a trace exception may be pending. The code below performs
| no action associated with the "chk" exception. If tracing is enabled,
| then it create a Trace exception stack frame from the "chk" exception
| stack frame and branches to the _real_trace() entry point.
|
| Linux/68k: commented out test for tracing

	.global		_060_real_divbyzero
_060_real_divbyzero:
|	tst.b		(%sp)			| is tracing enabled?
|	bpls		real_divbyzero_end	| no

|
|	 DIVBYZERO FRAME	   TRACE FRAME
|	*****************	*****************
|	*   Current PC	*	*   Current PC	*
|	*****************	*****************
|	* 0x2 *  0x014	*	* 0x2 *  0x024	*
|	*****************	*****************
|	*     Next	*	*     Next	*
|	*      PC	*	*      PC	*
|	*****************	*****************
|	*      SR	*	*      SR	*
|	*****************	*****************
|
|	move.b		#0x24,0x7(%sp)		| set trace vecno
|	bral		_060_real_trace

real_divbyzero_end:
	bral		trap			| jump to trap handler

|##########################

|
| _060_real_cas():
|
| Entry point for the selected cas emulation code implementation.
| If the implementation provided by the 68060ISP is sufficient,
| then this routine simply re-enters the package through _isp_cas.
|
	.global		_060_real_cas
_060_real_cas:
	bral		_I_CALL_TOP+0x80+0x08

|
| _060_real_cas2():
|
| Entry point for the selected cas2 emulation code implementation.
| If the implementation provided by the 68060ISP is sufficient,
| then this routine simply re-enters the package through _isp_cas2.
|
	.global