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/*
* $OpenBSD: netbsd.S,v 1.4 2013/02/02 13:32:05 miod Exp $
* $NetBSD: netbsd.S,v 1.3 1997/06/27 23:32:09 is 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>
/*
* 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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmrbs |# supervisor
dmrbu:
clrl %sp@- |# clear space on stack for result
movel #0x1,%sp@- |# pass: # bytes to copy
pea %sp@(0x7) |# pass: dst addr (stack)
movel %a0,%sp@- |# pass: src addr (user mem)
bsrl _C_LABEL(copyin) |# "copy in" the data
movel %d0,%d1 |# return success
addl #0xc,%sp |# delete params
movel %sp@+,%d0 |# put answer in d0
rts
dmrbs:
clrl %d0 |# clear whole longword
moveb %a0@,%d0 |# fetch super byte
clrl %d1 |# return success
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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmrws |# supervisor
dmrwu:
clrl %sp@- |# clear result space on stack
movel #0x2,%sp@- |# pass: # bytes to copy
pea %sp@(0x6) |# pass: dst addr (stack)
movel %a0,%sp@- |# pass: src addr (user mem)
bsrl _C_LABEL(copyin) |# "copy in" the data
movel %d0,%d1 |# return success
addl #0xc,%sp |# delete params
movel %sp@+,%d0 |# put answer in d0
rts
dmrws:
clrl %d0 |# clear whole longword
movew %a0@,%d0 |# fetch super word
clrl %d1 |# return success
rts
/*
* _060_imem_read_long():
* Read an instruction longword from user memory.
*
* _060_dmem_read_long():
* Read an 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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmrls |# supervisor
dmrlu:
subql #0x4,%sp |# clear result space on stack
movel #0x4,%sp@- |# pass: # bytes to copy
pea %sp@(0x4) |# pass: dst addr (stack)
movel %a0,%sp@- |# pass: src addr (user mem)
bsrl _C_LABEL(copyin) |# "copy in" the data
movel %d0,%d1 |# return success
addl #0xc,%sp |# delete params
movel %sp@+,%d0 |# put answer in d0
rts
dmrls:
movel %a0@,%d0 |# fetch super longword
clrl %d1 |# return success
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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmwbs |# supervisor
dmwbu:
movel %d0,%sp@- |# put src on stack
movel #0x1,%sp@- |# pass: # bytes to copy
movel %a0,%sp@- |# pass: dst addr (user mem)
pea %sp@(0xb) |# pass: src addr (stack)
bsrl _C_LABEL(copyout) |# "copy out" the data
movel %d0,%d1 |# return success
addl #0x10,%sp |# delete params + src
rts
dmwbs:
moveb %d0,%a0@ |# store super byte
clrl %d1 |# return success
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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmwws |# supervisor
dmwwu:
movel %d0,%sp@- |# put src on stack
movel #0x2,%sp@- |# pass: # bytes to copy
movel %a0,%sp@- |# pass: dst addr (user mem)
pea %sp@(0xa) |# pass: src addr (stack)
bsrl _C_LABEL(copyout) |# "copy out" the data
movel %d0,%d1 |# return success
addl #0x10,%sp |# delete params + src
rts
dmwws:
movew %d0,%a0@ |# store super word
clrl %d1 |# return success
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)
btst #0x5,%a6@(0x4) |# check for supervisor state
bnes dmwls |# supervisor
dmwlu:
movel %d0,%sp@- |# put src on stack
movel #0x4,%sp@- |# pass: # bytes to copy
movel %a0,%sp@- |# pass: dst addr (user mem)
pea %sp@(0x8) |# pass: src addr (stack)
bsrl _C_LABEL(copyout) |# "copy out" the data
movel %d0,%d1 |# return success
addl #0x10,%sp |# delete params + src
rts
dmwls:
movel %d0,%a0@ |# store super longword
clrl %d1 |# return success
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"
|
