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\ asm.fs assembler file (for MIPS R3000)
\
\ Copyright (C) 2000,2007 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.
\ test this with
\ gforth arch/mips/asm.fs -e "also assembler here" arch/mips/testasm.fs -e "here over - here" arch/mips/testdisasm.fs -e "here over - compare throw bye"
require ./../../code.fs
get-current
also assembler definitions
$20 constant asm-registers
\ register names
0 constant $zero
1 constant $at
2 constant $v0
3 constant $v1
\ 4 constant $a0 \ commented out to avoid shadowing hex numbers
\ 5 constant $a1
\ 6 constant $a2
\ 7 constant $a3
8 constant $t0
9 constant $t1
10 constant $t2
11 constant $t3
12 constant $t4
13 constant $t5
14 constant $t6
15 constant $t7
16 constant $s0
17 constant $s1
18 constant $s2
19 constant $s3
20 constant $s4
21 constant $s5
22 constant $s6
23 constant $s7
24 constant $t8
25 constant $t9
26 constant $k0
27 constant $k1
28 constant $gp
29 constant $sp
30 constant $s8
31 constant $ra
$00 constant asm-init-code
$1F constant asm-bm05
$3F constant asm-bm06
$FFFF constant asm-bm10
$3FFFFFF constant asm-bm1A
: asm-op ( n -- code )
asm-bm06 and $1a lshift ;
: check-range ( u1 u2 u3 -- )
within 0= -24 and throw ;
: asm-rs ( u code -- code )
over 0 $20 check-range
swap $15 lshift or ;
: asm-rt ( n code -- code )
over 0 $20 check-range
swap $10 lshift or ;
: asm-imm ( n code -- code )
over -$8000 $8000 check-range
swap $ffff and or ;
' asm-imm alias asm-offset
: asm-uimm ( u code -- code )
over 0 $10000 check-range
or ;
: asm-rel ( n code -- code )
over 3 and 0<> -24 and throw \ check lower 2 bits
swap 2/ 2/ swap asm-imm ;
: asm-target ( n code -- code )
over here cell+ xor $f0000003 and 0<> -24 and throw
swap 2 rshift asm-bm1A and or ;
: asm-rd ( n code -- code )
over 0 $20 check-range
swap $b lshift or ;
: asm-shamt ( n code -- code )
over 0 $20 check-range
swap $6 lshift or ;
' asm-shamt alias asm-sa
: asm-funct ( n code -- code )
swap asm-bm06 and or ;
: asm-special ( code1 -- code2 )
asm-init-code asm-funct ;
\ ***** I-types
: asm-I-rt,imm ( code -- )
create ,
does> ( rt imm -- )
@ asm-imm asm-rt , ;
: asm-I-rt,uimm ( code -- )
create ,
does> ( rt uimm -- )
@ asm-uimm asm-rt , ;
: asm-I-rs,imm ( code -- )
create ,
does> ( rs imm -- )
@ asm-rel asm-rs , ;
: asm-I-rt,rs,imm ( code -- )
create ,
does> ( rt rs imm -- )
@ asm-imm asm-rs asm-rt , ;
: asm-I-rt,rs,uimm ( code -- )
create ,
does> ( rt rs uimm -- )
@ asm-uimm asm-rs asm-rt , ;
: asm-I-rs,rt,imm ( code -- )
create ,
does> ( rs rt imm -- )
@ asm-rel asm-rt asm-rs , ;
: asm-I-rt,offset,rs ( code -- )
create ,
does> ( rt offset rs -- )
@ asm-rs asm-offset asm-rt , ;
\ ***** regimm types
: asm-regimm-rs,imm ( funct -- )
$01 asm-op asm-rt asm-I-rs,imm ;
\ ***** copz types 1
: asm-I-imm,z ( code -- )
create ,
does> ( imm z -- )
@ swap asm-op or asm-rel , ;
: asm-copz-imm ( code -- )
$10 asm-op or asm-I-imm,z ;
: asm-I-rt,offset,rs,z ( code -- )
create ,
does> ( rt offset rs z -- )
@ swap asm-op or asm-rs asm-offset asm-rt , ;
: asm-copz-rt,offset,rs ( code -- )
asm-op asm-I-rt,offset,rs,z ;
: asm-J-target ( code -- )
create ,
does> ( target -- )
@ asm-target , ;
\ ***** special types
: asm-special-nothing ( code -- )
asm-special create ,
does> ( addr -- )
@ , ;
: asm-special-rd ( code -- )
asm-special create ,
does> ( rd addr -- )
@ asm-rd , ;
: asm-special-rs ( code -- )
asm-special create ,
does> ( rs addr -- )
@ asm-rs , ;
: asm-special-rd,rs ( code -- )
asm-special create ,
does> ( rd rs addr -- )
@ asm-rs asm-rd , ;
: asm-special-rs,rt ( code -- )
asm-special create ,
does> ( rs rt addr -- )
@ asm-rt asm-rs , ;
: asm-special-rd,rs,rt ( code -- )
asm-special create ,
does> ( rd rs rt addr -- )
@ asm-rt asm-rs asm-rd , ;
: asm-special-rd,rt,rs ( code -- )
asm-special create ,
does> ( rd rt rs addr -- )
@ asm-rs asm-rt asm-rd , ;
: asm-special-rd,rt,sa ( code -- )
asm-special create ,
does> ( rd rt sa addr -- )
@ asm-sa asm-rt asm-rd , ;
\ ***** copz types 2
: asm-copz0 ( funct -- )
$10 $10 asm-op asm-rs asm-funct create ,
does> ( addr -- )
@ , ;
: asm-copz-rt,rd ( funct -- )
$10 asm-op or create ,
does> ( rt rd z addr -- )
@ swap asm-op or asm-rd asm-rt , ;
: nop, ( -- )
0 , ;
include ./insts.fs
: move, ( rd rs -- )
$zero addu, ;
\ commented out to reduce delay slot exceptions
\ : abs, ( rd rs -- )
\ dup $0008 bgez,
\ 2dup move,
\ $zero swap subu, ;
: neg, ( rd rs -- )
$zero swap subu, ;
: negu, ( rd rs -- )
$zero swap subu, ;
: not, ( rd rs -- )
$zero nor, ;
: li, ( rd imm -- )
dup 0= if
drop dup $zero = if
drop nop, assert( false )
else
$zero move,
endif
else
dup $8000 u< if
$zero swap addiu,
else
dup $10000 u< if
$zero swap ori,
else
dup $ffff and 0= if
$10 rshift lui,
else
dup $ffff8000 and $ffff8000 = if
$zero swap addiu,
else
2dup $10 rshift lui,
over swap ori,
endif
endif
endif
endif
endif ;
: blt, ( rs rt imm -- ) \ <
>r $at rot rot slt,
$at $zero r> bne, ;
: ble, ( rs rt imm -- ) \ <=
>r $at rot rot swap slt,
$at $zero r> beq, ;
: bgt, ( rs rt imm -- ) \ >
>r $at rot rot swap slt,
$at $zero r> bne, ;
: bge, ( rs rt imm -- ) \ >=
>r $at rot rot slt,
$at $zero r> beq, ;
: bltu, ( rs rt imm -- ) \ < unsigned
>r $at rot rot sltu,
$at $zero r> bne, ;
: bleu, ( rs rt imm -- ) \ <= unsigned
>r $at rot rot swap sltu,
$at $zero r> beq, ;
: bgtu, ( rs rt imm -- ) \ > unsigned
>r $at rot rot swap sltu,
$at $zero r> bne, ;
: bgeu, ( rs rt imm -- ) \ >= unsigned
>r $at rot rot sltu,
$at $zero r> beq, ;
\ control structures
\ conditions; they are reversed because of the if and until logic (the
\ stuff enclosed by if is performed if the branch around has the
\ inverse condition, cf. 0branch).
' beq, constant ne
' bne, constant eq
' blez, constant gtz
' bgtz, constant lez
' bltz, constant gez
' bgez, constant ltz
\ bczf, bczt, \ these don't take the relative address as last argument
' blt, constant ge
' ble, constant gt
' bgt, constant le
' bge, constant lt
' bltu, constant geu
' bleu, constant gtu
' bgtu, constant leu
' bgeu, constant ltu
\ an asm-cs-item consists of ( addr magic1 magic2 ). addr is the
\ address behind the branch or the destination. magic2 is LIVE-ORIG or
\ DEST xored with asm-magic to make it harder to confuse with a
\ register number or immediate value. magic1 is LIVE-orig or DEST.
\ It's there to make CS-ROLL etc. work.
: magic-asm ( u1 u2 -- u3 u4 )
\ turns a magic number into an asm-magic number or back
$87654321 xor ;
: patch-branch ( branch-delay-addr target-addr -- )
\ there is a branch just before branch-delay-addr; PATCH-BRANCH
\ patches this branch to branch to target-addr
over - ( branch-delay-addr rel )
swap cell - dup >r ( rel branch-addr R:branch-addr )
@ asm-rel r> ! ; \ !! relies on the imm field being 0 before
: if, ( ... xt -- asm-orig )
\ xt is for a branch word ( ... addr -- )
0 swap execute
here live-orig magic-asm live-orig ;
: ahead, ( -- asm-orig )
$zero $zero ne if, ;
: then, ( asm-orig -- )
orig? magic-asm orig?
here patch-branch ;
: begin, ( -- asm-dest )
here dest magic-asm dest ;
: until, ( asm-dest ... xt -- )
\ xt is a condition and ... are its arguments
0 swap execute
dest? magic-asm dest?
here swap patch-branch ;
: again, ( asm-dest -- )
$zero $zero ne until, ;
: while, ( asm-dest -- asm-orig asm-dest )
if, 1 cs-roll ;
: delayed-then, ( asm-orig -- )
\ set the target of asm-orig to one instruction after the current one
0 , then, -1 cells allot ;
: else, ( asm-orig1 -- asm-orig2 )
ahead, 1 cs-roll delayed-then, ;
: repeat, ( asm-orig asm-dest -- )
again, delayed-then, ;
: endif, ( asm-orig -- )
then, ;
previous
set-current
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