xref: /src/sys/arch/m68k/060sp/netbsd060sp.S

/*
#
# $NetBSD: netbsd060sp.S,v 1.8 2024/09/08 09:36:49 rillig Exp $
#
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
# M68000 Hi-Performance Microprocessor Division
# M68060 Software Package Production Release
#
# M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 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.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#
# Derived from:
# os.s
#
# This file contains:
#	- example "Call-Out"s required by both the ISP and FPSP.
#
*/

#include <machine/asm.h>

#include "assym.h"

/*
#
# make the copyright notice appear in the binary:
#
*/
#include "copyright.S"

/*
#################################
# EXAMPLE CALL-OUTS 		#
# 				#
# _060_dmem_write()		#
# _060_dmem_read()		#
# _060_imem_read()		#
# _060_dmem_read_byte()		#
# _060_dmem_read_word()		#
# _060_dmem_read_long()		#
# _060_imem_read_word()		#
# _060_imem_read_long()		#
# _060_dmem_write_byte()	#
# _060_dmem_write_word()	#
# _060_dmem_write_long()	#
#				#
# _060_real_trace()		#
# _060_real_access()		#
#################################
*/

/*
#
# Each IO routine checks to see if the memory write/read is to/from user
# or supervisor application space. The examples below use simple "move"
# instructions for supervisor mode applications and call _copyin()/_copyout()
# for user mode applications.
# When installing the 060SP, the _copyin()/_copyout() equivalents for a
# given operating system should be substituted.
#
# The addresses within the 060SP are guaranteed to be on the stack.
# The result is that Unix processes are allowed to sleep as a consequence
# of a page fault during a _copyout.
#
*/

/*
#
# _060_dmem_write():
#
# Writes to data memory while in supervisor mode.
#
# INPUTS:
#	a0 - supervisor source address
#	a1 - user destination address
#	d0 - number of bytes to write
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_dmem_write)
	btst	#0x5,%a6@(0x4)	|# check for supervisor state
	beqs	user_write
super_write:
	moveb	%a0@+,%a1@+	|# copy 1 byte
	subql	#0x1,%d0	|# decr byte counter
	bnes	super_write	|# quit if ctr = 0
	clrl	%d1		|# return success
	rts
user_write:
	movel	%d0,%sp@-	|# pass: counter
	movel	%a1,%sp@-	|# pass: user dst
	movel	%a0,%sp@-	|# pass: supervisor src
	bsrl	_C_LABEL(copyout)	|# write byte to user mem
	movel	%d0,%d1		|# return success
	addl	#0xc,%sp	|# clear 3 lw params
	rts

/*
#
# _060_imem_read(), _060_dmem_read():
#
# Reads from data/instruction memory while in supervisor mode.
#
# INPUTS:
#	a0 - user source address
#	a1 - supervisor destination address
#	d0 - number of bytes to read
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_imem_read)
ASENTRY_NOPROFILE(_060_dmem_read)
	btst	#0x5,%a6@(0x4)	|# check for supervisor state
	beqs	user_read
super_read:
	moveb	%a0@+,%a1@+	|# copy 1 byte
	subql	#0x1,%d0	|# decr byte counter
	bnes	super_read	|# quit if ctr = 0
	clrl	%d1		|# return success
	rts
user_read:
	movel	%d0,%sp@-	|# pass: counter
	movel	%a1,%sp@-	|# pass: super dst
	movel	%a0,%sp@-	|# pass: user src
	bsrl	_C_LABEL(copyin)	|# read byte from user mem
	movel	%d0,%d1		|# return success
	addl	#0xc,%sp	|# clear 3 lw params
	rts

/*
#
# _060_dmem_read_byte():
#
# Read a data byte from user memory.
#
# INPUTS:
#	a0 - user source address
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d0 - data byte in d0
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_dmem_read_byte)
	clrl	%d1			|# return success
	clrl	%d0			|# clear whole longword
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmrbs			|# supervisor
dmrbu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsb	%a0@,%d0
	bra	Lfdone

dmrbs:
	moveb	%a0@,%d0		|# fetch super byte
	rts

/*
#
# _060_imem_read_word():
# Read an instruction word from user memory.
#
# _060_dmem_read_word():
# Read a data word from user memory.
#
# INPUTS:
#	a0 - user source address
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d0 - data word in d0
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_imem_read_word)
ASENTRY_NOPROFILE(_060_dmem_read_word)
	clrl	%d1			|# return success
	clrl	%d0			|# clear whole longword
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmrws			|# supervisor
dmrwu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsw	%a0@,%d0
	bra	Lfdone
dmrws:
	movew	%a0@,%d0		|# fetch super word
	rts

/*
#
# _060_imem_read_long():
# Read an instruction longword from user memory.
#
# _060_dmem_read_long():
# Read a data longword from user memory.
#
#
# INPUTS:
#	a0 - user source address
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d0 - data longword in d0
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_imem_read_long)
ASENTRY_NOPROFILE(_060_dmem_read_long)
	clrl	%d1			|# return success
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmrls			|# supervisor
dmrlu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsl	%a0@,%d0
	bra	Lfdone
dmrls:
	movel	%a0@,%d0		|# fetch super longword
	rts

/*
#
# _060_dmem_write_byte():
#
# Write a data byte to user memory.
#
# INPUTS:
#	a0 - user destination address
# 	d0 - data byte in d0
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_dmem_write_byte)
	clrl	%d1			|# return success
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmwbs			|# supervisor
dmwbu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsb	%d0,%a0@
	bra	Lfdone
dmwbs:
	moveb	%d0,%a0@		|# store super byte
	rts

/*
#
# _060_dmem_write_word():
#
# Write a data word to user memory.
#
# INPUTS:
#	a0 - user destination address
# 	d0 - data word in d0
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_dmem_write_word)
	clrl	%d1			|# return success
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmwws			|# supervisor
dmwwu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsw	%d0,%a0@
	bra	Lfdone
dmwws:
	movew	%d0,%a0@		|# store super word
	rts

/*
#
# _060_dmem_write_long():
#
# Write a data longword to user memory.
#
# INPUTS:
#	a0 - user destination address
# 	d0 - data longword in d0
# 	a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
# OUTPUTS:
#	d1 - 0 = success, !0 = failure
#
*/
ASENTRY_NOPROFILE(_060_dmem_write_long)
	clrl	%d1			|# return success
	btst	#0x5,%a6@(0x4)		|# check for supervisor state
	bnes	dmwls			|# supervisor
dmwlu:
	movl	_C_LABEL(curpcb),%a1	| fault handler
	movl	#Lferr,%a1@(PCB_ONFAULT)| set it
	movsl	%d0,%a0@
	bra	Lfdone
dmwls:
	movel	%d0,%a0@		|# store super longword
	rts

|############################################################################
Lferr:
	moveq	#-1,%d1
Lfdone:
	clrl	%a1@(PCB_ONFAULT)	| clear fault handler
	rts

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

/*
#
# _060_real_trace():
#
# This is the exit point for the 060FPSP when an instruction is being traced
# and there are no other higher priority exceptions pending for this instruction
# or they have already been processed.
#
# The sample code below simply executes an "rte".
#
*/
ASENTRY_NOPROFILE(_060_real_trace)
	jra	_C_LABEL(trace)

/*
#
# _060_real_access():
#
# This is the exit point for the 060FPSP when an access error exception
# is encountered. The routine below should point to the operating system
# handler for access error exceptions. The exception stack frame is an
# 8-word access error frame.
#
# We jump directly to the 68060 buserr handler.
# If we had a sane ld, we could use use that entry point directly...
#
*/
ASENTRY_NOPROFILE(_060_real_access)
	jra	_C_LABEL(buserr60)

#include "inetbsd.S"
#include "fnetbsd.S"