xref: /openbmc/linux/arch/m68k/ifpsp060/fskeleton.S (revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2)

|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|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.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| fskeleton.s
|
| This file contains:
|	(1) example "Call-out"s
|	(2) example package entry code
|	(3) example "Call-out" table
|

#include <linux/linkage.h>

|################################
| (1) EXAMPLE CALL-OUTS		#
|				#
| _060_fpsp_done()		#
| _060_real_ovfl()		#
| _060_real_unfl()		#
| _060_real_operr()		#
| _060_real_snan()		#
| _060_real_dz()		#
| _060_real_inex()		#
| _060_real_bsun()		#
| _060_real_fline()		#
| _060_real_fpu_disabled()	#
| _060_real_trap()		#
|################################

|
| _060_fpsp_done():
|
| This is the main exit point for the 68060 Floating-Point
| Software Package. For a normal exit, all 060FPSP routines call this
| routine. The operating system can do system dependent clean-up or
| simply execute an "rte" as with the sample code below.
|
	.global		_060_fpsp_done
_060_fpsp_done:
	bral	 _060_isp_done	| do the same as isp_done

|
| _060_real_ovfl():
|
| This is the exit point for the 060FPSP when an enabled overflow exception
| is present. The routine below should point to the operating system handler
| for enabled overflow conditions. The exception stack frame is an overflow
| stack frame. The FP state frame holds the EXCEPTIONAL OPERAND.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_ovfl
_060_real_ovfl:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler


|
| _060_real_unfl():
|
| This is the exit point for the 060FPSP when an enabled underflow exception
| is present. The routine below should point to the operating system handler
| for enabled underflow conditions. The exception stack frame is an underflow
| stack frame. The FP state frame holds the EXCEPTIONAL OPERAND.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_unfl
_060_real_unfl:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler

|
| _060_real_operr():
|
| This is the exit point for the 060FPSP when an enabled operand error exception
| is present. The routine below should point to the operating system handler
| for enabled operand error exceptions. The exception stack frame is an operand error
| stack frame. The FP state frame holds the source operand of the faulting
| instruction.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_operr
_060_real_operr:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler

|
| _060_real_snan():
|
| This is the exit point for the 060FPSP when an enabled signalling NaN exception
| is present. The routine below should point to the operating system handler
| for enabled signalling NaN exceptions. The exception stack frame is a signalling NaN
| stack frame. The FP state frame holds the source operand of the faulting
| instruction.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_snan
_060_real_snan:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler

|
| _060_real_dz():
|
| This is the exit point for the 060FPSP when an enabled divide-by-zero exception
| is present. The routine below should point to the operating system handler
| for enabled divide-by-zero exceptions. The exception stack frame is a divide-by-zero
| stack frame. The FP state frame holds the source operand of the faulting
| instruction.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_dz
_060_real_dz:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler

|
| _060_real_inex():
|
| This is the exit point for the 060FPSP when an enabled inexact exception
| is present. The routine below should point to the operating system handler
| for enabled inexact exceptions. The exception stack frame is an inexact
| stack frame. The FP state frame holds the source operand of the faulting
| instruction.
|
| The sample routine below simply clears the exception status bit and
| does an "rte".
|
	.global		_060_real_inex
_060_real_inex:
	fsave		-(%sp)
	move.w		#0x6000,0x2(%sp)
	frestore	(%sp)+
	bral		trap	| jump to trap handler

|
| _060_real_bsun():
|
| This is the exit point for the 060FPSP when an enabled bsun exception
| is present. The routine below should point to the operating system handler
| for enabled bsun exceptions. The exception stack frame is a bsun
| stack frame.
|
| The sample routine below clears the exception status bit, clears the NaN
| bit in the FPSR, and does an "rte". The instruction that caused the
| bsun will now be re-executed but with the NaN FPSR bit cleared.
|
	.global		_060_real_bsun
_060_real_bsun:
|	fsave		-(%sp)

	fmove.l		%fpsr,-(%sp)
	andi.b		#0xfe,(%sp)
	fmove.l		(%sp)+,%fpsr

	bral		trap	| jump to trap handler

|
| _060_real_fline():
|
| This is the exit point for the 060FPSP when an F-Line Illegal exception is
| encountered. Three different types of exceptions can enter the F-Line exception
| vector number 11: FP Unimplemented Instructions, FP implemented instructions when
| the FPU is disabled, and F-Line Illegal instructions. The 060FPSP module
| _fpsp_fline() distinguishes between the three and acts appropriately. F-Line
| Illegals branch here.
|
	.global		_060_real_fline
_060_real_fline:
	bral		trap	| jump to trap handler

|
| _060_real_fpu_disabled():
|
| This is the exit point for the 060FPSP when an FPU disabled exception is
| encountered. Three different types of exceptions can enter the F-Line exception
| vector number 11: FP Unimplemented Instructions, FP implemented instructions when
| the FPU is disabled, and F-Line Illegal instructions. The 060FPSP module
| _fpsp_fline() distinguishes between the three and acts appropriately. FPU disabled
| exceptions branch here.
|
| The sample code below enables the FPU, sets the PC field in the exception stack
| frame to the PC of the instruction causing the exception, and does an "rte".
| The execution of the instruction then proceeds with an enabled floating-point
| unit.
|
	.global		_060_real_fpu_disabled
_060_real_fpu_disabled:
	move.l		%d0,-(%sp)		| enabled the fpu
	.long	0x4E7A0808			|movec		pcr,%d0
	bclr		#0x1,%d0
	.long	0x4E7B0808			|movec		%d0,pcr
	move.l		(%sp)+,%d0

	move.l		0xc(%sp),0x2(%sp)	| set "Current PC"
	rte

|
| _060_real_trap():
|
| This is the exit point for the 060FPSP when an emulated "ftrapcc" instruction
| discovers that the trap condition is true and it should branch to the operating
| system handler for the trap exception vector number 7.
|
| The sample code below simply executes an "rte".
|
	.global		_060_real_trap
_060_real_trap:
	bral		trap	| jump to trap handler

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

|#################################
| (2) EXAMPLE PACKAGE ENTRY CODE #
|#################################

	.global		_060_fpsp_snan
_060_fpsp_snan:
	bra.l		_FP_CALL_TOP+0x80+0x00

	.global		_060_fpsp_operr
_060_fpsp_operr:
	bra.l		_FP_CALL_TOP+0x80+0x08

	.global		_060_fpsp_ovfl
_060_fpsp_ovfl:
	bra.l		_FP_CALL_TOP+0x80+0x10

	.global		_060_fpsp_unfl
_060_fpsp_unfl:
	bra.l		_FP_CALL_TOP+0x80+0x18

	.global		_060_fpsp_dz
_060_fpsp_dz:
	bra.l		_FP_CALL_TOP+0x80+0x20

	.global		_060_fpsp_inex
_060_fpsp_inex:
	bra.l		_FP_CALL_TOP+0x80+0x28

	.global		_060_fpsp_fline
_060_fpsp_fline:
	bra.l		_FP_CALL_TOP+0x80+0x30

	.global		_060_fpsp_unsupp
_060_fpsp_unsupp:
	bra.l		_FP_CALL_TOP+0x80+0x38

	.global		_060_fpsp_effadd
_060_fpsp_effadd:
	bra.l		_FP_CALL_TOP+0x80+0x40

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

|###############################
| (3) EXAMPLE CALL-OUT SECTION #
|###############################

| The size of this section MUST be 128 bytes!!!

_FP_CALL_TOP:
	.long	_060_real_bsun		- _FP_CALL_TOP
	.long	_060_real_snan		- _FP_CALL_TOP
	.long	_060_real_operr		- _FP_CALL_TOP
	.long	_060_real_ovfl		- _FP_CALL_TOP
	.long	_060_real_unfl		- _FP_CALL_TOP
	.long	_060_real_dz		- _FP_CALL_TOP
	.long	_060_real_inex		- _FP_CALL_TOP
	.long	_060_real_fline		- _FP_CALL_TOP
	.long	_060_real_fpu_disabled	- _FP_CALL_TOP
	.long	_060_real_trap		- _FP_CALL_TOP
	.long	_060_real_trace		- _FP_CALL_TOP
	.long	_060_real_access	- _FP_CALL_TOP
	.long	_060_fpsp_done		- _FP_CALL_TOP

	.long	0x00000000, 0x00000000, 0x00000000

	.long	_060_imem_read		- _FP_CALL_TOP
	.long	_060_dmem_read		- _FP_CALL_TOP
	.long	_060_dmem_write		- _FP_CALL_TOP
	.long	_060_imem_read_word	- _FP_CALL_TOP
	.long	_060_imem_read_long	- _FP_CALL_TOP
	.long	_060_dmem_read_byte	- _FP_CALL_TOP
	.long	_060_dmem_read_word	- _FP_CALL_TOP
	.long	_060_dmem_read_long	- _FP_CALL_TOP
	.long	_060_dmem_write_byte	- _FP_CALL_TOP
	.long	_060_dmem_write_word	- _FP_CALL_TOP
	.long	_060_dmem_write_long	- _FP_CALL_TOP

	.long	0x00000000

	.long	0x00000000, 0x00000000, 0x00000000, 0x00000000

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

| 060 FPSP KERNEL PACKAGE NEEDS TO GO HERE!!!

#include "fpsp.sa"