--- gforth/arch/alpha/asm.fs 2000/06/17 12:01:55 1.4 +++ gforth/arch/alpha/asm.fs 2000/09/23 15:47:01 1.9 @@ -1,8 +1,26 @@ - -\ bernd thallner 9725890 881 \ assembler in forth for alpha -\ require ../../code.fs +\ Copyright (C) 1999,2000 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 2 +\ 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, write to the Free Software +\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. + +\ contributed by Bernd Thallner + +require ./../../code.fs get-current also assembler definitions @@ -81,90 +99,88 @@ endif 4 allot ; -\ format - -: Bra ( oo ) \ branch instruction format - create , -does> ( ra, branch_disp, addr ) - @ 26 lshift - swap $1fffff and or - swap $1f and 21 lshift or h, -; - -: Mbr ( oo.h ) \ memory branch instruction format - create 2, -does> ( ra, rb, hint, addr ) - 2@ 14 lshift - swap 26 lshift or - swap $3fff and or - swap $1f and 16 lshift or - swap $1f and 21 lshift or - h, -; - -: F-P ( oo.fff ) \ floating-point operate instruction format - create 2, -does> ( fa, fb, fc, addr ) - 2@ 5 lshift - swap 26 lshift or - swap $1f and or - swap $1f and 16 lshift or - swap $1f and 21 lshift or - h, -; - -: Mem ( oo ) \ memory instruction format - create , -does> ( ra, memory_disp, rb, addr ) - @ 26 lshift - swap $1f and 16 lshift or - swap $ffff and or - swap $1f and 21 lshift or - h, -; - -: Mfc ( oo.ffff ) \ memory instruction with function code format - create 2, -does> ( ra, rb, addr ) - 2@ - swap 26 lshift or - swap $1f and 16 lshift or - swap $1f and 21 lshift or - h, -; +\ operands -: Opr ( oo.ff ) \ operate instruction format - create 2, -does> ( ra, rb, rc, addr ) - 2@ - 5 lshift - swap 26 lshift or - swap $1f and or - swap $1f and 16 lshift or - swap $1f and 21 lshift or - h, -; +: check-range ( u1 u2 u3 -- ) + within 0= -24 and throw ; -: Opr# ( oo.ff ) \ operate instruction format - create 2, -does> ( ra, lit, rc, addr ) - 2@ - 5 lshift - swap 26 lshift or - 1 12 lshift or - swap $1f and or - swap $ff and 13 lshift or - swap $1f and 21 lshift or - h, -; - -: Pcd ( oo ) \ palcode instruction format - create , -does> ( palcode, addr ) - @ 26 lshift - swap $3ffffff and or - h, -; +: rega ( rega code -- code ) + \ ra field, named rega to avoid conflict with register ra + swap dup 0 $20 check-range + 21 lshift or ; + +: rb ( rb code -- code ) + swap dup 0 $20 check-range + 16 lshift or ; + +: rc ( rc code -- code ) + swap dup 0 $20 check-range + or ; + +: hint ( addr code -- code ) + swap 2 rshift $3fff and or ; + +: disp ( n code -- code ) + swap dup -$8000 $8000 check-range + $ffff and or ; + +: branch-rel ( n code -- code ) + swap dup 3 and 0<> -24 and throw + 2/ 2/ + dup -$100000 $100000 check-range + $1fffff and or ; + +: branch-disp ( addr code -- code ) + swap here 4 + - swap branch-rel ; + +: imm ( u code -- code ) + swap dup 0 $100 check-range + 13 lshift or ; + +: palcode ( u code -- code ) + swap dup 0 $4000000 check-range or ; + +\ formats + +: Bra ( opcode -- ) \ branch instruction format + create 26 lshift , +does> ( rega target-addr -- ) + @ branch-disp rega h, ; + +: Mbr ( opcode hint -- ) \ memory branch instruction format + create 14 lshift swap 26 lshift or , +does> ( rega rb hint -- ) + @ hint rb rega h, ; + +: F-P ( opcode func -- ) \ floating-point operate instruction format + create 5 lshift swap 26 lshift or , +does> ( fa fb fc -- ) + @ rc rb rega h, ; + +: Mem ( opcode -- ) \ memory instruction format + create 26 lshift , +does> ( rega memory_disp rb -- ) + @ rb disp rega h, ; + +: Mfc ( opcode func -- ) \ memory instruction with function code format + create swap 26 lshift or , +does> ( rega rb -- ) + @ rb rega h, ; + +: Opr ( opcode.ff ) \ operate instruction format + create 5 lshift swap 26 lshift or , +does> ( rega rb rc -- ) + @ rc rb rega h, ; + +: Opr# ( opcode func -- ) \ operate instruction format + create 5 lshift swap 26 lshift or 1 12 lshift or , +does> ( rega imm rc -- ) + @ rc imm rega h, ; + +: Pcd ( opcode -- ) \ palcode instruction format + create 26 lshift , +does> ( palcode addr -- ) + @ palcode h, ; \ instructions @@ -193,7 +209,7 @@ $38 Bra blbc, $3c Bra blbs, $3b Bra ble, $3a Bra blt, -$3d Bra bne, +$3d Bra bne, $30 Bra br, $34 Bra bsr, $00 Pcd call_pal, @@ -402,63 +418,73 @@ $12 $30 Opr# zap#, $12 $31 Opr zapnot, $12 $31 Opr# zapnot#, -\ 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). + +' beq, constant ne +' bge, constant lt +' bgt, constant le +' blbc, constant lbs +' blbs, constant lbc +' ble, constant gt +' blt, constant ge +' bne, constant eq +' fbeq, constant fne +' fbge, constant flt +' fbgt, constant fle +' fble, constant fgt +' fblt, constant fge +' fbne, constant feq + +\ control structures + +: magic-asm ( u1 u2 -- u3 u4 ) + \ turns a magic number into an asm-magic number or back + $fedcba0987654321 xor ; + +: patch-branch ( behind-branch-addr target-addr -- ) + \ there is a branch just before behind-branch-addr; PATCH-BRANCH + \ patches this branch to branch to target-addr + over - ( behind-branch-addr rel ) + swap 4 - dup >r ( rel branch-addr R:branch-addr ) + h@ branch-rel r> h! ; \ !! relies on the imm field being 0 before + +: if, ( reg xt -- asm-orig ) + \ xt is for a branch word ( reg addr -- ) + here 4 + swap execute \ put 0 into the disp field + here live-orig magic-asm live-orig ; + +: ahead, ( -- asm-orig ) + zero ['] br, if, ; + +: then, ( asm-orig -- ) + orig? magic-asm orig? + here patch-branch ; + +: begin, ( -- asm-dest ) + here dest magic-asm dest ; + +: until, ( asm-dest reg xt -- ) + \ xt is a condition ( reg addr -- ) + here 4 + swap execute + dest? magic-asm dest? + here swap patch-branch ; + +: again, ( asm-dest -- ) + zero ['] br, until, ; + +: while, ( asm-dest -- asm-orig asm-dest ) + if, 1 cs-roll ; -\ if, [ else, ] endif, +: else, ( asm-orig1 -- asm-orig2 ) + ahead, 1 cs-roll then, ; -: ahead, ( -- asmorig ) - 31 0 br, - here 4 - -; +: repeat, ( asm-orig asm-dest -- ) + again, then, ; -: if, ( -- asmorig ) - 0 beq, - here 4 - -; - -: endif, ( asmorig -- ) - dup here swap - 4 - 4 / - $1fffff and - over h@ or swap h! -; - -: else, ( asmorig1 -- asmorig2 ) - ahead, - swap - endif, -; - -\ begin, again, - -: begin, ( -- asmdest ) - here -; - -: again, ( asmdest -- ) - here - 4 - 4 / - $1fffff and - 31 swap br, -; - -\ begin, until, - -: until, ( asmdest -- ) - here rot swap - 4 - 4 / - $1fffff and - bne, -; - -\ begin, while, repeat, - -: while, ( asmdest -- asmorig asmdest ) - if, - swap -; - -: repeat, ( asmorig asmdest -- ) - again, - endif, -; +: endif, ( asm-orig -- ) + then, ; \ \ jump marks @@ -563,3 +589,4 @@ $12 $31 Opr# zapnot#, previous set-current +