360 lines
9.0 KiB
ArmAsm
360 lines
9.0 KiB
ArmAsm
#
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# $NetBSD: netbsd060sp.S,v 1.4 1997/09/28 12:57:57 is Exp $
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#
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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# M68000 Hi-Performance Microprocessor Division
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# M68060 Software Package Production Release
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#
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# M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 Motorola Inc.
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# All rights reserved.
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#
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# THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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# To the maximum extent permitted by applicable law,
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# MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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# INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
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# FOR A PARTICULAR PURPOSE and any warranty against infringement with
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# regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
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# and any accompanying written materials.
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#
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# To the maximum extent permitted by applicable law,
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# IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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# (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
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# BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
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# ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
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#
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# Motorola assumes no responsibility for the maintenance and support
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# of the SOFTWARE.
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#
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# You are hereby granted a copyright license to use, modify, and distribute the
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# SOFTWARE so long as this entire notice is retained without alteration
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# in any modified and/or redistributed versions, and that such modified
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# versions are clearly identified as such.
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# No licenses are granted by implication, estoppel or otherwise under any
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# patents or trademarks of Motorola, Inc.
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#
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# Derived from:
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# os.s
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#
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# This file contains:
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# - example "Call-Out"s required by both the ISP and FPSP.
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#
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#
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# make the copyright notice appear in the binary:
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#
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.include "copyright.S"
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#################################
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# EXAMPLE CALL-OUTS #
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# #
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# _060_dmem_write() #
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# _060_dmem_read() #
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# _060_imem_read() #
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# _060_dmem_read_byte() #
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# _060_dmem_read_word() #
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# _060_dmem_read_long() #
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# _060_imem_read_word() #
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# _060_imem_read_long() #
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# _060_dmem_write_byte() #
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# _060_dmem_write_word() #
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# _060_dmem_write_long() #
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# #
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# _060_real_trace() #
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# _060_real_access() #
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#################################
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#
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# Each IO routine checks to see if the memory write/read is to/from user
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# or supervisor application space. The examples below use simple "move"
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# instructions for supervisor mode applications and call _copyin()/_copyout()
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# for user mode applications.
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# When installing the 060SP, the _copyin()/_copyout() equivalents for a
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# given operating system should be substituted.
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#
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# The addresses within the 060SP are guaranteed to be on the stack.
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# The result is that Unix processes are allowed to sleep as a consequence
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# of a page fault during a _copyout.
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#
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#
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# _060_dmem_write():
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#
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# Writes to data memory while in supervisor mode.
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#
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# INPUTS:
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# a0 - supervisor source address
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# a1 - user destination address
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# d0 - number of bytes to write
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_write
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_060_dmem_write:
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btst #0x5,a6@(0x4) |# check for supervisor state
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beqs user_write
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super_write:
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moveb a0@+,a1@+ |# copy 1 byte
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subql #0x1,d0 |# decr byte counter
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bnes super_write |# quit if ctr = 0
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clrl d1 |# return success
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rts
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user_write:
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movel d0,sp@- |# pass: counter
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movel a1,sp@- |# pass: user dst
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movel a0,sp@- |# pass: supervisor src
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bsrl _copyout |# write byte to user mem
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movel d0,d1 |# return success
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addl #0xc,sp |# clear 3 lw params
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rts
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#
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# _060_imem_read(), _060_dmem_read():
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#
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# Reads from data/instruction memory while in supervisor mode.
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#
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# INPUTS:
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# a0 - user source address
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# a1 - supervisor destination address
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# d0 - number of bytes to read
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d1 - 0 = success, !0 = failure
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#
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.global _060_imem_read
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.global _060_dmem_read
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_060_imem_read:
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_060_dmem_read:
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btst #0x5,a6@(0x4) |# check for supervisor state
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beqs user_read
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super_read:
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moveb a0@+,a1@+ |# copy 1 byte
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subql #0x1,d0 |# decr byte counter
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bnes super_read |# quit if ctr = 0
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clrl d1 |# return success
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rts
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user_read:
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movel d0,sp@- |# pass: counter
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movel a1,sp@- |# pass: super dst
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movel a0,sp@- |# pass: user src
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bsrl _copyin |# read byte from user mem
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movel d0,d1 |# return success
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addl #0xc,sp |# clear 3 lw params
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rts
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#
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# _060_dmem_read_byte():
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#
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# Read a data byte from user memory.
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#
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# INPUTS:
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# a0 - user source address
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d0 - data byte in d0
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_read_byte
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_060_dmem_read_byte:
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clrl d1 |# return success
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clrl d0 |# clear whole longword
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmrbs |# supervisor
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dmrbu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsb a0@,d0
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bra Lfdone
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dmrbs:
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moveb a0@,d0 |# fetch super byte
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clrl d1 |# return success
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rts
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#
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# _060_imem_read_word():
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# Read an instruction word from user memory.
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#
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# _060_dmem_read_word():
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# Read a data word from user memory.
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#
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# INPUTS:
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# a0 - user source address
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d0 - data word in d0
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# d1 - 0 = success, !0 = failure
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#
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.global _060_imem_read_word
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.global _060_dmem_read_word
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_060_imem_read_word:
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_060_dmem_read_word:
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clrl d1 |# return success
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clrl d0 |# clear whole longword
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmrws |# supervisor
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dmrwu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsw a0@,d0
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bra Lfdone
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dmrws:
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movew a0@,d0 |# fetch super word
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rts
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#
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# _060_imem_read_long():
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# Read an instruction longword from user memory.
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#
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# _060_dmem_read_long():
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# Read an data longword from user memory.
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#
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#
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# INPUTS:
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# a0 - user source address
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d0 - data longword in d0
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_read_long
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.global _060_imem_read_long
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_060_imem_read_long:
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_060_dmem_read_long:
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clrl d1 |# return success
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmrls |# supervisor
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dmrlu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsl a0@,d0
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bra Lfdone
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dmrls:
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movel a0@,d0 |# fetch super longword
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clrl d1 |# return success
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rts
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#
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# _060_dmem_write_byte():
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#
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# Write a data byte to user memory.
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#
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# INPUTS:
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# a0 - user destination address
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# d0 - data byte in d0
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_write_byte
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_060_dmem_write_byte:
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clrl d1 |# return success
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmwbs |# supervisor
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dmwbu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsb d0,a0@
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bra Lfdone
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dmwbs:
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moveb d0,a0@ |# store super byte
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rts
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#
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# _060_dmem_write_word():
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#
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# Write a data word to user memory.
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#
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# INPUTS:
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# a0 - user destination address
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# d0 - data word in d0
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_write_word
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_060_dmem_write_word:
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clrl d1 |# return success
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmwws |# supervisor
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dmwwu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsw d0,a0@
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bra Lfdone
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dmwws:
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movew d0,a0@ |# store super word
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rts
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#
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# _060_dmem_write_long():
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#
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# Write a data longword to user memory.
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#
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# INPUTS:
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# a0 - user destination address
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# d0 - data longword in d0
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# a6@(0x4),bit5 - 1 = supervisor mode, 0 = user mode
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# OUTPUTS:
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# d1 - 0 = success, !0 = failure
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#
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.global _060_dmem_write_long
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_060_dmem_write_long:
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clrl d1 |# return success
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btst #0x5,a6@(0x4) |# check for supervisor state
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bnes dmwls |# supervisor
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dmwlu:
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movl _curpcb,a1 | fault handler
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movl #Lferr,a1@(64) | set it
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movsl d0,a0@
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bra Lfdone
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dmwls:
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movel d0,a0@ |# store super longword
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rts
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############################################################################
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Lferr:
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moveq #-1,d1
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Lfdone:
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clrl a1@(64) | clear fault handler
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rts
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############################################################################
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#
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# _060_real_trace():
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#
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# This is the exit point for the 060FPSP when an instruction is being traced
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# and there are no other higher priority exceptions pending for this instruction
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# or they have already been processed.
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#
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# The sample code below simply executes an "rte".
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#
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.global _060_real_trace,_trace
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_060_real_trace:
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jra _trace
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#
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# _060_real_access():
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#
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# This is the exit point for the 060FPSP when an access error exception
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# is encountered. The routine below should point to the operating system
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# handler for access error exceptions. The exception stack frame is an
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# 8-word access error frame.
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#
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# We jump directly to the 68060 buserr handler.
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# If we had a sane ld, we could use use that entry point directly...
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#
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.globl _060_real_access,_buserr60
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_060_real_access:
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jra _buserr60
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.include "inetbsd.S"
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.include "fnetbsd.S"
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