File:  [gforth] / gforth / arch / mips / disasm.fs
Revision 1.12: download - view: text, annotated - select for diffs
Sat Sep 23 15:47:02 2000 UTC (19 years, 9 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, v0-6-1, v0-6-0, v0-5-0, HEAD
changed FSF address in copyright messages

    1: \ disasm.fs	disassembler file (for MIPS R3000)
    2: \
    3: \ Copyright (C) 2000 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ this disassembler is based on data from the R4400 manual
   22: \ http://www.mips.com/Documentation/R4400_Uman_book_Ed2.pdf, in
   23: \ particular pages A3, A181, A182 (p. 471, 649, 650 in xpdf).
   24: \ it is limited to the R3000 (MIPS-I) architecture, though.
   25: 
   26: \ test this with
   27: \ gforth arch/mips/disasm.fs -e "here" arch/mips/testdisasm.fs -e "here over - disasm bye" |sed 's/([^)]*) //'|diff -u - arch/mips/testasm.fs
   28: 
   29: get-current
   30: vocabulary disassembler
   31: also disassembler definitions
   32: 
   33: \ instruction fields
   34: 
   35: : disasm-op ( w -- u )
   36:     26 rshift ;
   37: 
   38: : disasm-rs ( w -- u )
   39:     21 rshift $1F and ;
   40: 
   41: : disasm-rt ( w -- u )
   42:     16 rshift $1f and ;
   43: 
   44: : disasm-rd ( w -- u )
   45:     11 rshift $1f and ;
   46: 
   47: : disasm-shamt ( w -- u )
   48:     \ shift amount field
   49:     6 rshift $1f and ;
   50: 
   51: : disasm-funct ( w -- u )
   52:     $3f and ;
   53: 
   54: : disasm-copz ( w -- u )
   55:     disasm-op 3 and ;
   56: 
   57: : disasm-uimm ( w -- u )
   58:     $ffff and ;
   59: 
   60: : disasm-imm ( w -- n )
   61:     disasm-uimm dup 15 rshift negate 15 lshift or ;
   62: 
   63: : disasm-relative ( addr n -- w )
   64:     \ compute printable form of relative address n relative to addr
   65:     2 lshift nip ( + ) ;
   66: 
   67: \ decode tables
   68: 
   69: : disasm-illegal ( addr w -- )
   70:     \ disassemble illegal/unknown instruction w at addr
   71:     hex. ." , ( illegal inst ) " drop ;
   72: 
   73: : disasm-table ( n "name" -- )
   74:     \ initialize table with n entries with disasm-illegal
   75:     create 0 ?do
   76: 	['] disasm-illegal ,
   77:     loop
   78: does> ( u -- addr )
   79:     swap cells + ;
   80: 
   81: $40 disasm-table opc-tab-entry     \ top-level decode table
   82: $40 disasm-table funct-tab-entry   \ special function table
   83: $20 disasm-table regimm-tab-entry  \ regim instructions rt table
   84: $20 disasm-table copz-rs-tab-entry \ COPz instructions rs table
   85: $20 disasm-table copz-rt-tab-entry \ COPz BC instructions rt table
   86: $40 disasm-table cp0-tab-entry     \ COP0 CO instructions funct table
   87: 
   88: \ disassembler central decode cascade
   89: 
   90: dup set-current
   91: 
   92: : disasm-inst ( addr w -- )
   93:     \G disassemble instruction w at addr (addr is used for computing
   94:     \G branch targets)
   95:     dup disasm-op opc-tab-entry @ execute ;
   96: 
   97: : disasm ( addr u -- ) \ gforth
   98:     \G disassemble u aus starting at addr
   99:     bounds u+do
  100: 	cr ." ( " i hex. ." ) " i i @ disasm-inst
  101: 	1 cells +loop
  102:     cr ;
  103: 
  104: ' disasm IS discode
  105: 
  106: definitions
  107: 
  108: : disasm-special ( addr w -- )
  109:     \ disassemble inst with opcode special
  110:     dup disasm-funct funct-tab-entry @ execute ;
  111: ' disasm-special 0 opc-tab-entry ! \ enter it for opcode special
  112: 
  113: : disasm-regimm ( addr w -- )
  114:     \ disassemble regimm inst
  115:     dup disasm-rt regimm-tab-entry @ execute ;
  116: ' disasm-regimm 1 opc-tab-entry ! \ enter it for opcode regimm
  117: 
  118: : disasm-copz-rs ( addr w -- )
  119:     \ disassemble inst with opcode COPz
  120:     dup disasm-rs copz-rs-tab-entry @ execute ;
  121: ' disasm-copz-rs $10 opc-tab-entry ! \ enter it for opcodes COPz
  122: ' disasm-copz-rs $11 opc-tab-entry !
  123: ' disasm-copz-rs $12 opc-tab-entry !
  124: 
  125: : disasm-copz-rt ( addr w -- )
  126:     \ disassemble inst with opcode COPz, rs=BC
  127:     dup disasm-rt copz-rt-tab-entry @ execute ;
  128: ' disasm-copz-rt $08 copz-rs-tab-entry ! \ into COPz-table for rs=BC
  129: 
  130: : disasm-cp0 ( addr w -- )
  131:     \ disassemble inst with opcode COPz, rs=CO
  132:     dup disasm-funct cp0-tab-entry @ execute ;
  133: ' disasm-cp0 $10 copz-rs-tab-entry ! \ into COPz-table for rs=CO
  134: 
  135: \ dummy words for insts.fs (words with these names are needed by asm.fs)
  136: 
  137: : asm-op ( -- ) ;
  138: : asm-rs ( -- ) ;
  139: : asm-rt ( -- ) ;
  140: 
  141: \ disassemble various formats
  142: 
  143: : disasm-J-target ( addr w -- )
  144:     \ print jump target
  145:     2 lshift $0fffffff and swap $f0000000 and or hex. ;
  146: 
  147: : disasm-I-rs,rt,imm ( addr w -- )
  148:     dup disasm-rs .
  149:     dup disasm-rt .
  150:     disasm-imm disasm-relative . ;
  151: 
  152: : disasm-I-rs,imm ( addr w -- )
  153:     dup disasm-rs .
  154:     disasm-imm disasm-relative . ;
  155: 
  156: : disasm-rt,rs,imm ( addr w -- )
  157:     dup disasm-rt .
  158:     dup disasm-rs .
  159:     disasm-imm .
  160:     drop ;
  161: 
  162: : disasm-rt,rs,uimm ( addr w -- )
  163:     dup disasm-rt .
  164:     dup disasm-rs .
  165:     disasm-uimm hex.
  166:     drop ;
  167: 
  168: : disasm-rt,uimm ( addr w -- )
  169:     dup disasm-rt .
  170:     disasm-uimm hex.
  171:     drop ;
  172: 
  173: : disasm-rt,imm,rs ( addr w -- )
  174:     dup disasm-rt .
  175:     dup disasm-imm .
  176:     dup disasm-rs .
  177:     2drop ;
  178: 
  179: : disasm-rd,rt,sa ( addr w -- )
  180:     dup disasm-rd .
  181:     dup disasm-rt .
  182:     dup disasm-shamt .
  183:     2drop ;
  184: 
  185: : disasm-rd,rt,rs ( addr w -- )
  186:     dup disasm-rd .
  187:     dup disasm-rt .
  188:     dup disasm-rs .
  189:     2drop ;
  190: 
  191: : disasm-rs. ( addr w -- )
  192:     dup disasm-rs .
  193:     2drop ;
  194: 
  195: : disasm-rd,rs ( addr w -- )
  196:     dup disasm-rd .
  197:     dup disasm-rs .
  198:     2drop ;
  199: 
  200: : disasm-rd. ( addr w -- )
  201:     dup disasm-rd .
  202:     2drop ;
  203: 
  204: : disasm-rs,rt ( addr w -- )
  205:     dup disasm-rs .
  206:     dup disasm-rt .
  207:     2drop ;
  208: 
  209: : disasm-rd,rs,rt ( addr w -- )
  210:     dup disasm-rd .
  211:     dup disasm-rs .
  212:     dup disasm-rt .
  213:     2drop ;
  214: 
  215: : disasm-rt,rd,z ( addr w -- )
  216:     dup disasm-rt .
  217:     dup disasm-rd .
  218:     dup disasm-copz .
  219:     2drop ;
  220: 
  221: : disasm-I-imm,z ( addr w -- )
  222:     tuck disasm-imm disasm-relative .
  223:     disasm-copz . ;
  224: 
  225: \ meta-defining word for instruction format disassembling definitions
  226: 
  227: \ The following word defines instruction-format words, which in turn
  228: \ define anonymous words for disassembling specific instructions and
  229: \ put them in the appropriate decode table.
  230: 
  231: : define-format ( disasm-xt table-xt -- )
  232:     \ define an instruction format that uses disasm-xt for
  233:     \ disassembling and enters the defined instructions into table
  234:     \ table-xt
  235:     create 2,
  236: does> ( u "inst" -- )
  237:     \ defines an anonymous word for disassembling instruction inst,
  238:     \ and enters it as u-th entry into table-xt
  239:     2@ swap here name string, ( u table-xt disasm-xt c-addr ) \ remember string
  240:     noname create 2,      \ define anonymous word
  241:     execute lastxt swap ! \ enter xt of defined word into table-xt
  242: does> ( addr w -- )
  243:     \ disassemble instruction w at addr
  244:     2@ >r ( addr w disasm-xt R: c-addr )
  245:     execute ( R: c-addr ) \ disassemble operands
  246:     r> count type ; \ print name 
  247: 
  248: \ all the following words have the stack effect ( u "name" )
  249: ' disasm-J-target    ' opc-tab-entry 	 define-format asm-J-target
  250: ' disasm-I-rs,rt,imm ' opc-tab-entry 	 define-format asm-I-rs,rt,imm
  251: ' disasm-I-rs,imm    ' opc-tab-entry 	 define-format asm-I-rs,imm1
  252: ' disasm-rt,rs,imm   ' opc-tab-entry 	 define-format asm-I-rt,rs,imm
  253: ' disasm-rt,rs,uimm   ' opc-tab-entry 	 define-format asm-I-rt,rs,uimm
  254: ' disasm-rt,uimm      ' opc-tab-entry 	 define-format asm-I-rt,uimm
  255: ' disasm-rt,imm,rs   ' opc-tab-entry 	 define-format asm-I-rt,offset,rs
  256: ' disasm-rd,rt,sa    ' funct-tab-entry 	 define-format asm-special-rd,rt,sa
  257: ' disasm-rd,rt,rs    ' funct-tab-entry 	 define-format asm-special-rd,rt,rs
  258: ' disasm-rs.         ' funct-tab-entry 	 define-format asm-special-rs
  259: ' disasm-rd,rs       ' funct-tab-entry 	 define-format asm-special-rd,rs
  260: ' 2drop              ' funct-tab-entry 	 define-format asm-special-nothing
  261: ' disasm-rd.         ' funct-tab-entry 	 define-format asm-special-rd
  262: ' disasm-rs,rt       ' funct-tab-entry 	 define-format asm-special-rs,rt
  263: ' disasm-rd,rs,rt    ' funct-tab-entry 	 define-format asm-special-rd,rs,rt
  264: ' disasm-I-rs,imm    ' regimm-tab-entry  define-format asm-regimm-rs,imm
  265: ' 2drop              ' cp0-tab-entry     define-format asm-copz0
  266: ' disasm-rt,rd,z     ' copz-rs-tab-entry define-format asm-copz-rt,rd1
  267: ' disasm-I-imm,z     ' copz-rt-tab-entry define-format asm-copz-imm1
  268: 
  269: : asm-I-rs,imm ( u1 u2 "name" -- ; compiled code: addr w -- )
  270:     nip asm-I-rs,imm1 ;
  271: 
  272: : asm-copz-rt,rd ( u1 u2 "name" -- )
  273:     drop asm-copz-rt,rd1 ;
  274: 
  275: : asm-copz-rt,offset,rs ( u "name" -- )
  276:     \ ignore these insts, we disassemble using  asm-I-rt,offset,rs
  277:     drop name 2drop ;
  278: 
  279: : asm-copz-imm ( u1 u2 u3 "name" -- )
  280:     drop nip asm-copz-imm1 ;
  281: 
  282: include ./insts.fs
  283: 
  284: previous set-current

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