rsalz@uunet.uu.net (Rich Salz) (05/25/88)
Submitted-by: "G. M. Harding" <gm@uts.amdahl.com>
Posting-number: Volume 15, Issue 7
Archive-name: dis88/part02
#! /bin/sh
# This is a shell archive. Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file". To overwrite existing
# files, type "sh file -c". You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g.. If this archive is complete, you
# will see the following message at the end:
# "End of archive 2 (of 2)."
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'dishand.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'dishand.c'\"
else
echo shar: Extracting \"'dishand.c'\" \(25688 characters\)
sed "s/^X//" >'dishand.c' <<'END_OF_FILE'
static char *sccsid =
X "@(#) dishand.c, Ver. 2.1 created 00:00:00 87/09/01";
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * Copyright (C) 1987 G. M. Harding, all rights reserved *
X * *
X * Permission to copy and redistribute is hereby granted, *
X * provided full source code, with all copyright notices, *
X * accompanies any redistribution. *
X * *
X * This file contains the source code for most of the spe- *
X * cialized handler routines of the disassembler program. *
X * (The file disfp.c contains handler routines specific to *
X * the 8087 numeric co-processor.) Each handler routine *
X * interprets the opcode byte (and subsequent data bytes, *
X * if any) of a particular family of opcodes, and is re- *
X * sponsible for generating appropriate output. All of the *
X * code in this file is highly MACHINE-SPECIFIC, and would *
X * have to be rewritten for a different CPU. The handler *
X * routines are accessed only via pointers in the optab[] *
X * array, however, so machine dependencies are confined to *
X * this file, its sister file "disfp.c", and the data file *
X * "distabs.c". *
X * *
X * All of the code in this file is based on the assumption *
X * of sixteen-bit integers. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
X#include "dis.h" /* Disassembler declarations */
X
int segflg; /* Segment-override flag */
X
unsigned char objbuf[OBJMAX]; /* Buffer for object code */
X
int objptr; /* Index into objbuf[] */
X
unsigned long PC; /* Current program counter */
X
X /* * * * * * MISCELLANEOUS SUPPORTING ROUTINES * * * * * */
X
X
void
objini(j) /* Object code init routine */
X
X register int j;
X
X{
X if ((segflg == 1) || (segflg == 2))
X segflg *= 3;
X else
X segflg = 0;
X objptr = 0;
X objbuf[objptr++] = (unsigned char)(j);
X}
X
X
void
objout() /* Object-code output routine */
X
X{
X register int k;
X
X if ( ! objflg )
X return;
X else
X {
X printf("\t|");
X if (symptr >= 0)
X printf(" %05.5lx:",(PC + 1L - (long)(objptr)));
X for (k = 0; k < objptr; ++k)
X printf(" %02.2x",objbuf[k]);
X putchar('\n');
X }
X}
X
X
void
badseq(j,k) /* Invalid-sequence routine */
X
X register int j, k;
X
X{
X printf("\t.byte\t0x%02.2x\t\t| invalid code sequence\n",j);
X printf("\t.byte\t0x%02.2x\n",k);
X}
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This routine is the first of several opcode-specific *
X * handlers, each of which is dedicated to a particular *
X * opcode family. A pointer to a handler routine is con- *
X * tained in the second field of each optab[] entry. The *
X * dfhand() routine is the default handler, invoked when *
X * no other handler is appropriate (generally, when an in- *
X * valid opcode is encountered). *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
dfhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF dfhand() * * * * * * * * * */
X
X segflg = 0;
X
X printf("\t.byte\t0x%02.2x",j);
X
X if (optab[j].min || optab[j].max)
X putchar('\n');
X else
X printf("\t\t| unimplemented opcode\n");
X
X}/* * * * * * * * * * * END OF dfhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the single-byte handler, invoked whenever a *
X * one-byte opcode is encountered. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
sbhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF sbhand() * * * * * * * * * */
X
X objini(j);
X
X if (j == 0x2e) /* seg cs */
X segflg = 1;
X
X if ((j == 0x26) /* seg es */
X || (j == 0x36) /* seg ss */
X || (j == 0x3e)) /* seg ds */
X segflg = 2;
X
X printf("%s\n",optab[j].text);
X
X objout();
X
X}/* * * * * * * * * * * END OF sbhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for most of the processor's regular *
X * arithmetic operations. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
aohand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF aohand() * * * * * * * * * */
X
X register int k;
X int m, n;
X char b[64];
X
X objini(j);
X
X switch (j & 7)
X {
X case 0 :
X case 1 :
X case 2 :
X case 3 :
X printf("%s\t",optab[j].text);
X FETCH(k);
X printf("%s\n",mtrans(j,k,TR_STD));
X break;
X case 4 :
X FETCH(k);
X printf("%s\tal,*0x%02.2x\n",optab[j].text,k);
X break;
X case 5 :
X FETCH(m);
X FETCH(n);
X k = (n << 8) | m;
X if (lookext((long)(k),(PC - 1),b))
X printf("%s\tax,#%s\n",optab[j].text,b);
X else
X printf("%s\tax,#0x%04.4x\n",optab[j].text,k);
X break;
X default :
X dfhand(j);
X break;
X }
X
X objout();
X
X}/* * * * * * * * * * * END OF aohand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for opcodes which perform short *
X * (eight-bit) relative jumps. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
sjhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF sjhand() * * * * * * * * * */
X
X register int k;
X int m;
X
X objini(j);
X
X FETCH(m);
X
X if (m & 0x80)
X k = 0xff00;
X else
X k = 0;
X
X k |= m;
X
X printf("%s\t%s\t\t| loc %05.5lx\n",optab[j].text,
X lookup((PC + k + 1L),N_TEXT,LOOK_REL,-1L),
X (PC + k + 1L));
X
X objout();
X
X}/* * * * * * * * * * * END OF sjhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for a loosely-knit family of op- *
X * codes which perform arithmetic and logical operations, *
X * and which take immediate data. The routine's logic is *
X * rather complex, so, in an effort to avoid additional *
X * complexity, the search for external references in the *
X * relocation table has been dispensed with. Eager hackers *
X * can try their hand at coding such a search. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
imhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF imhand() * * * * * * * * * */
X
X unsigned long pc;
X register int k;
X int offset, oflag, immed, iflag, mod, opi, w, rm;
X int m, n;
X static char a[100], b[30];
X
X objini(j);
X
X FETCH(k);
X
X pc = PC + 1;
X
X offset = 0;
X mod = (k & 0xc0) >> 6;
X opi = (k & 0x38) >> 3;
X w = j & 1;
X rm = k & 7;
X
X if ((j & 2)
X && ((opi == 1)
X || (opi == 4)
X || (opi == 6)))
X {
X badseq(j,k);
X return;
X }
X
X strcpy(a,OPFAM[opi]);
X
X if ( ! w )
X strcat(a,"b");
X
X if ((oflag = mod) > 2)
X oflag = 0;
X
X if ((mod == 0) && (rm == 6))
X {
X FETCH(m);
X FETCH(n);
X offset = (n << 8) | m;
X }
X else if (oflag)
X if (oflag == 2)
X {
X FETCH(m);
X FETCH(n);
X offset = (n << 8) | m;
X }
X else
X {
X FETCH(m);
X if (m & 0x80)
X n = 0xff00;
X else
X n = 0;
X offset = n | m;
X }
X
X switch (j & 3)
X {
X case 0 :
X case 2 :
X FETCH(immed);
X iflag = 0;
X break;
X case 1 :
X FETCH(m);
X FETCH(n);
X immed = (n << 8) | m;
X iflag = 1;
X break;
X case 3 :
X FETCH(immed);
X if (immed & 0x80)
X immed &= 0xff00;
X iflag = 0;
X break;
X }
X
X strcat(a,"\t");
X
X switch (mod)
X {
X case 0 :
X if (rm == 6)
X strcat(a,
X lookup((long)(offset),N_DATA,LOOK_ABS,pc));
X else
X {
X sprintf(b,"(%s)",REGS0[rm]);
X strcat(a,b);
X }
X break;
X case 1 :
X case 2 :
X if (mod == 1)
X strcat(a,"*");
X else
X strcat(a,"#");
X sprintf(b,"%d(",offset);
X strcat(a,b);
X strcat(a,REGS1[rm]);
X strcat(a,")");
X break;
X case 3 :
X strcat(a,REGS[(w << 3) | rm]);
X break;
X }
X
X strcat(a,",");
X if (iflag)
X strcat(a,"#");
X else
X strcat(a,"*");
X sprintf(b,"%d",immed);
X strcat(a,b);
X
X printf("%s\n",a);
X
X objout();
X
X}/* * * * * * * * * * * END OF imhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for various "mov"-type opcodes *
X * which use the mod, reg, and r/m fields of the second *
X * code byte in a standard, straightforward way. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mvhand(j)
X
X int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mvhand() * * * * * * * * * */
X
X register int k, m = j;
X
X objini(j);
X
X FETCH(k);
X
X if ((m == 0x84) || (m == 0x85) /* Kind of kludgey */
X || (m == 0xc4) || (m == 0xc5)
X || (m == 0x8d))
X if (m & 0x40)
X m |= 0x03;
X else
X m |= 0x02;
X
X printf("%s\t%s\n",optab[j].text,mtrans(m,k,TR_STD));
X
X objout();
X
X}/* * * * * * * * * * * END OF mvhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for segment-register "mov" opcodes. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mshand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mshand() * * * * * * * * * */
X
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X if (k & 0x20)
X {
X badseq(j,k);
X return;
X }
X
X printf("%s\t%s\n",optab[j].text,mtrans(j,k,TR_SEG));
X
X objout();
X
X}/* * * * * * * * * * * END OF mshand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for pops, other than single-byte *
X * pops. (The 8088 allows popping into any register, or *
X * directly into memory, accessed either immediately or *
X * through a register and an index.) *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
pohand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF pohand() * * * * * * * * * */
X
X char *a;
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X if (k & 0x38)
X {
X badseq(j,k);
X return;
X }
X
X printf("%s\t",optab[j].text);
X
X a = mtrans((j & 0xfd),k,TR_STD);
X
X mtrunc(a);
X
X printf("%s\n",a);
X
X objout();
X
X}/* * * * * * * * * * * END OF pohand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler routine for intersegment calls and *
X * jumps. Its output is never symbolic, because the host *
X * linker does not allow symbolic intersegment address *
X * references except by means of symbolic constants, and *
X * any such constants in the symbol table, even if they *
X * are of the appropriate value, may be misleading. In *
X * compiled code, intersegment references should not be *
X * encountered, and even in assembled code, they should *
X * occur infrequently. If and when they do occur, however, *
X * they will be disassembled in absolute form. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
cihand(j)
X
X int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF cihand() * * * * * * * * * */
X
X register int m, n;
X
X objini(j);
X
X printf("%s\t",optab[j].text);
X
X FETCH(m);
X FETCH(n);
X
X printf("#0x%04.4x,",((n << 8) | m));
X
X FETCH(m);
X FETCH(n);
X
X printf("#0x%04.4x\n",((n << 8) | m));
X
X objout();
X
X}/* * * * * * * * * * * END OF cihand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for "mov" opcodes with immediate *
X * data. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mihand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mihand() * * * * * * * * * */
X
X register int k;
X int m, n;
X char b[64];
X
X objini(j);
X
X printf("%s",optab[j].text);
X
X if (j & 8)
X {
X FETCH(m);
X FETCH(n);
X k = ((n << 8) | m);
X if (lookext((long)(k),(PC - 1),b))
X printf("#%s\n",b);
X else
X printf("#%d\n",k);
X }
X else
X {
X FETCH(m);
X printf("*%d\n",m);
X }
X
X objout();
X
X}/* * * * * * * * * * * END OF mihand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for a family of quick-move opcodes. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mqhand(j)
X
X int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mqhand() * * * * * * * * * */
X
X unsigned long pc;
X register int m, n;
X
X objini(j);
X
X pc = PC + 1;
X
X FETCH(m);
X FETCH(n);
X
X m = (n << 8) | m;
X
X printf("%s\t",optab[j].text);
X
X if (j & 2)
X printf("%s,%s\n",
X lookup((long)(m),N_DATA,LOOK_ABS,pc),
X REGS[(j & 1) << 3]);
X else
X printf("%s,%s\n",
X REGS[(j & 1) << 3],
X lookup((long)(m),N_DATA,LOOK_ABS,pc));
X
X objout();
X
X}/* * * * * * * * * * * END OF mqhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for a family of quick-test opcodes. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
tqhand(j)
X
X int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF tqhand() * * * * * * * * * */
X
X register int m, n;
X int k;
X char b[64];
X
X objini(j);
X
X printf("%s\t%s,",optab[j].text,REGS[(j & 1) << 3]);
X
X FETCH(m);
X
X if (j & 1)
X {
X FETCH(n);
X k = ((n << 8) | m);
X if (lookext((long)(k),(PC - 1),b))
X printf("#%s\n",b);
X else
X printf("#%d\n",k);
X }
X else
X {
X if (m & 80)
X m |= 0xff00;
X printf("*%d\n",m);
X }
X
X objout();
X
X}/* * * * * * * * * * * END OF tqhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for multiple-byte "return" opcodes. *
X * The 8088 allows returns to take an optional 16-bit ar- *
X * gument, which reflects the amount to be added to SP *
X * after the pop of the return address. The idea is to *
X * facilitate the use of local parameters on the stack. *
X * After some rumination, it was decided to disassemble *
X * any such arguments as absolute quantities, rather than *
X * rummaging through the symbol table for possible corre- *
X * sponding constants. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
rehand(j)
X
X int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF rehand() * * * * * * * * * */
X
X register int m, n;
X
X objini(j);
X
X FETCH(m);
X FETCH(n);
X
X m = (n << 8) | m;
X
X printf("%s\t#0x%04.4x\n",optab[j].text,m);
X
X objout();
X
X}/* * * * * * * * * * * END OF rehand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for "mov" opcodes involving memory *
X * and immediate data. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mmhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mmhand() * * * * * * * * * */
X
X char *a;
X register int k;
X char b[64];
X
X objini(j);
X
X FETCH(k);
X
X if (k & 0x38)
X {
X badseq(j,k);
X return;
X }
X
X printf("%s",optab[j].text);
X
X if ( ! (j & 1) )
X putchar('b');
X
X a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
X
X mtrunc(a);
X
X printf("\t%s,",a);
X
X if (j & 1)
X {
X FETCH(j);
X FETCH(k);
X k = (k << 8) | j;
X if (lookext((long)(k),(PC - 1),b))
X printf("#%s\n",b);
X else
X printf("#%d\n",k);
X }
X else
X {
X FETCH(k);
X printf("*%d\n",k);
X }
X
X objout();
X
X}/* * * * * * * * * * * END OF mmhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for the 8088 family of shift and *
X * rotate instructions. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
srhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF srhand() * * * * * * * * * */
X
X char *a;
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X if ((k & 0x38) == 0x30)
X {
X badseq(j,k);
X return;
X }
X
X printf("%s",OPFAM[((k & 0x38) >> 3) + 16]);
X
X if ( ! (j & 1) )
X putchar('b');
X
X a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
X
X mtrunc(a);
X
X printf("\t%s",a);
X
X if (j & 2)
X printf(",cl\n");
X else
X printf(",*1\n");
X
X objout();
X
X}/* * * * * * * * * * * END OF srhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for the ASCII-adjust opcodes. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
aahand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF aahand() * * * * * * * * * */
X
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X if (k != 0x0a)
X {
X badseq(j,k);
X return;
X }
X
X printf("%s\n",optab[j].text);
X
X objout();
X
X}/* * * * * * * * * * * END OF aahand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for port I/O opcodes which specify *
X * the port address as an immediate operand. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
iohand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF iohand() * * * * * * * * * */
X
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X printf("%s\t0x%02.2x\n",optab[j].text,k);
X
X objout();
X
X}/* * * * * * * * * * * END OF iohand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for opcodes which perform long *
X * (sixteen-bit) relative jumps and calls. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
ljhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF ljhand() * * * * * * * * * */
X
X register int k;
X int m, n;
X
X objini(j);
X
X FETCH(m);
X FETCH(n);
X
X k = (n << 8) | m;
X
X printf("%s\t%s\t\t| loc %05.5lx\n",optab[j].text,
X lookup((PC + k + 1L),N_TEXT,LOOK_LNG,(PC - 1L)),
X (PC + k + 1L));
X
X objout();
X
X}/* * * * * * * * * * * END OF ljhand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for a pair of oddball opcodes (0xf6 *
X * and 0xf7) which perform miscellaneous arithmetic opera- *
X * tions not dealt with elsewhere. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mahand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mahand() * * * * * * * * * */
X
X char *a;
X register int k;
X char b[64];
X
X objini(j);
X
X FETCH(k);
X
X a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
X
X mtrunc(a);
X
X switch (((k = objbuf[1]) & 0x38) >> 3)
X {
X case 0 :
X printf("\ttest");
X break;
X case 1 :
X badseq(j,k);
X return;
X case 2 :
X printf("\tnot");
X break;
X case 3 :
X printf("\tneg");
X break;
X case 4 :
X printf("\tmul");
X break;
X case 5 :
X printf("\timul");
X break;
X case 6 :
X printf("\tdiv");
X break;
X case 7 :
X printf("\tidiv");
X break;
X }
X
X if ( ! (j & 1) )
X putchar('b');
X
X printf("\t%s",a);
X
X if (k & 0x38)
X putchar('\n');
X else
X if (j & 1)
X {
X FETCH(j);
X FETCH(k);
X k = (k << 8) | j;
X if (lookext((long)(k),(PC - 1),b))
X printf(",#%s\n",b);
X else
X printf(",#%d\n",k);
X }
X else
X {
X FETCH(k);
X printf(",*%d\n",k);
X }
X
X objout();
X
X}/* * * * * * * * * * * END OF mahand() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This is the handler for miscellaneous jump, call, push, *
X * and increment/decrement opcodes (0xfe and 0xff) which *
X * are not dealt with elsewhere. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mjhand(j)
X
X register int j; /* Pointer to optab[] entry */
X
X{/* * * * * * * * * * START OF mjhand() * * * * * * * * * */
X
X char *a;
X register int k;
X
X objini(j);
X
X FETCH(k);
X
X a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
X
X mtrunc(a);
X
X switch (((k = objbuf[1]) & 0x38) >> 3)
X {
X case 0 :
X printf("\tinc");
X if ( ! (j & 1) )
X putchar('b');
X putchar('\t');
X break;
X case 1 :
X printf("\tdec");
X if ( ! (j & 1) )
X putchar('b');
X putchar('\t');
X break;
X case 2 :
X if (j & 1)
X printf("\tcall\t@");
X else
X goto BAD;
X break;
X case 3 :
X if (j & 1)
X printf("\tcalli\t@");
X else
X goto BAD;
X break;
X case 4 :
X if (j & 1)
X printf("\tjmp\t@");
X else
X goto BAD;
X break;
X case 5 :
X if (j & 1)
X printf("\tjmpi\t@");
X else
X goto BAD;
X break;
X case 6 :
X if (j & 1)
X printf("\tpush\t");
X else
X goto BAD;
X break;
X case 7 :
X BAD :
X badseq(j,k);
X return;
X }
X
X printf("%s\n",a);
X
X objout();
X
X}/* * * * * * * * * * * END OF mjhand() * * * * * * * * * * */
X
X
END_OF_FILE
if test 25688 -ne `wc -c <'dishand.c'`; then
echo shar: \"'dishand.c'\" unpacked with wrong size!
fi
# end of 'dishand.c'
fi
if test -f 'distabs.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'distabs.c'\"
else
echo shar: Extracting \"'distabs.c'\" \(30238 characters\)
sed "s/^X//" >'distabs.c' <<'END_OF_FILE'
static char *sccsid =
X "@(#) distabs.c, Ver. 2.1 created 00:00:00 87/09/01";
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * Copyright (C) 1987 G. M. Harding, all rights reserved *
X * *
X * Permission to copy and redistribute is hereby granted, *
X * provided full source code, with all copyright notices, *
X * accompanies any redistribution. *
X * *
X * This file contains the lookup tables and other data *
X * structures for the Intel 8088 symbolic disassembler. It *
X * also contains a few global routines which facilitate *
X * access to the tables, for use primarily by the handler *
X * functions. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
X#include "dis.h" /* Disassembler declarations */
X
struct exec HDR; /* Used to hold header info */
X
struct nlist symtab[MAXSYM]; /* Array of symbol table info */
X
struct reloc relo[MAXSYM]; /* Array of relocation info */
X
int symptr = -1, /* Index into symtab[] */
X relptr = -1; /* Index into relo[] */
X
char *REGS[] = /* Table of register names */
X {
X "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh",
X "ax", "cx", "dx", "bx", "sp", "bp", "si", "di",
X "es", "cs", "ss", "ds"
X };
X
char *REGS0[] = /* Mode 0 register name table */
X {
X "bx_si", "bx_di", "bp_si", "bp_di", "si", "di", "", "bx"
X };
X
char *REGS1[] = /* Mode 1 register name table */
X {
X "bx_si", "bx_di", "bp_si", "bp_di", "si", "di", "bp", "bx"
X };
X
int symrank[6][6] = /* Symbol type/rank matrix */
X {
X /* UND ABS TXT DAT BSS COM */
X /* UND */ 5, 4, 1, 2, 3, 0,
X /* ABS */ 1, 5, 4, 3, 2, 0,
X /* TXT */ 4, 1, 5, 3, 2, 0,
X /* DAT */ 3, 1, 2, 5, 4, 0,
X /* BSS */ 3, 1, 2, 4, 5, 0,
X /* COM */ 2, 0, 1, 3, 4, 5
X };
X
X /* * * * * * * * * * * * OPCODE DATA * * * * * * * * * * * */
X
char ADD[] = "\tadd", /* Mnemonics by family */
X OR[] = "\tor",
X ADC[] = "\tadc",
X SBB[] = "\tsbb",
X AND[] = "\tand",
X SUB[] = "\tsub",
X XOR[] = "\txor",
X CMP[] = "\tcmp",
X NOT[] = "\tnot",
X NEG[] = "\tneg",
X MUL[] = "\tmul",
X DIV[] = "\tdiv",
X MOV[] = "\tmov",
X ESC[] = "\tesc",
X TEST[] = "\ttest",
X AMBIG[] = "",
X ROL[] = "\trol",
X ROR[] = "\tror",
X RCL[] = "\trcl",
X RCR[] = "\trcr",
X SAL[] = "\tsal",
X SHR[] = "\tshr",
X SHL[] = "\tshl",
X SAR[] = "\tsar";
X
char *OPFAM[] = /* Family lookup table */
X {
X ADD, OR, ADC, SBB, AND, SUB, XOR, CMP,
X NOT, NEG, MUL, DIV, MOV, ESC, TEST, AMBIG,
X ROL, ROR, RCL, RCR, SAL, SHR, SHL, SAR
X };
X
struct opcode optab[] = /* Table of opcode data */
X {
X ADD, aohand, 2, 4, /* 0x00 */
X ADD, aohand, 2, 4, /* 0x01 */
X ADD, aohand, 2, 4, /* 0x02 */
X ADD, aohand, 2, 4, /* 0x03 */
X ADD, aohand, 2, 2, /* 0x04 */
X ADD, aohand, 3, 3, /* 0x05 */
X "\tpush\tes", sbhand, 1, 1, /* 0x06 */
X "\tpop\tes", sbhand, 1, 1, /* 0x07 */
X OR, aohand, 2, 4, /* 0x08 */
X OR, aohand, 2, 4, /* 0x09 */
X OR, aohand, 2, 4, /* 0x0a */
X OR, aohand, 2, 4, /* 0x0b */
X OR, aohand, 2, 2, /* 0x0c */
X OR, aohand, 3, 3, /* 0x0d */
X "\tpush\tcs", sbhand, 1, 1, /* 0x0e */
X NULL, dfhand, 0, 0, /* 0x0f */
X ADC, aohand, 2, 4, /* 0x10 */
X ADC, aohand, 2, 4, /* 0x11 */
X ADC, aohand, 2, 4, /* 0x12 */
X ADC, aohand, 2, 4, /* 0x13 */
X ADC, aohand, 2, 2, /* 0x14 */
X ADC, aohand, 3, 3, /* 0x15 */
X "\tpush\tss", sbhand, 1, 1, /* 0x16 */
X "\tpop\tss", sbhand, 1, 1, /* 0x17 */
X SBB, aohand, 2, 4, /* 0x18 */
X SBB, aohand, 2, 4, /* 0x19 */
X SBB, aohand, 2, 4, /* 0x1a */
X SBB, aohand, 2, 4, /* 0x1b */
X SBB, aohand, 2, 2, /* 0x1c */
X SBB, aohand, 3, 3, /* 0x1d */
X "\tpush\tds", sbhand, 1, 1, /* 0x1e */
X "\tpop\tds", sbhand, 1, 1, /* 0x1f */
X AND, aohand, 2, 4, /* 0x20 */
X AND, aohand, 2, 4, /* 0x21 */
X AND, aohand, 2, 4, /* 0x22 */
X AND, aohand, 2, 4, /* 0x23 */
X AND, aohand, 2, 2, /* 0x24 */
X AND, aohand, 3, 3, /* 0x25 */
X "\tseg\tes", sbhand, 1, 1, /* 0x26 */
X "\tdaa", sbhand, 1, 1, /* 0x27 */
X SUB, aohand, 2, 4, /* 0x28 */
X SUB, aohand, 2, 4, /* 0x29 */
X SUB, aohand, 2, 4, /* 0x2a */
X SUB, aohand, 2, 4, /* 0x2b */
X SUB, aohand, 2, 2, /* 0x2c */
X SUB, aohand, 3, 3, /* 0x2d */
X "\tseg\tcs", sbhand, 1, 1, /* 0x2e */
X "\tdas", sbhand, 1, 1, /* 0x2f */
X XOR, aohand, 2, 4, /* 0x30 */
X XOR, aohand, 2, 4, /* 0x31 */
X XOR, aohand, 2, 4, /* 0x32 */
X XOR, aohand, 2, 4, /* 0x33 */
X XOR, aohand, 2, 2, /* 0x34 */
X XOR, aohand, 3, 3, /* 0x35 */
X "\tseg\tss", sbhand, 1, 1, /* 0x36 */
X "\taaa", sbhand, 1, 1, /* 0x37 */
X CMP, aohand, 2, 4, /* 0x38 */
X CMP, aohand, 2, 4, /* 0x39 */
X CMP, aohand, 2, 4, /* 0x3a */
X CMP, aohand, 2, 4, /* 0x3b */
X CMP, aohand, 2, 2, /* 0x3c */
X CMP, aohand, 3, 3, /* 0x3d */
X "\tseg\tds", sbhand, 1, 1, /* 0x3e */
X "\taas", sbhand, 1, 1, /* 0x3f */
X "\tinc\tax", sbhand, 1, 1, /* 0x40 */
X "\tinc\tcx", sbhand, 1, 1, /* 0x41 */
X "\tinc\tdx", sbhand, 1, 1, /* 0x42 */
X "\tinc\tbx", sbhand, 1, 1, /* 0x43 */
X "\tinc\tsp", sbhand, 1, 1, /* 0x44 */
X "\tinc\tbp", sbhand, 1, 1, /* 0x45 */
X "\tinc\tsi", sbhand, 1, 1, /* 0x46 */
X "\tinc\tdi", sbhand, 1, 1, /* 0x47 */
X "\tdec\tax", sbhand, 1, 1, /* 0x48 */
X "\tdec\tcx", sbhand, 1, 1, /* 0x49 */
X "\tdec\tdx", sbhand, 1, 1, /* 0x4a */
X "\tdec\tbx", sbhand, 1, 1, /* 0x4b */
X "\tdec\tsp", sbhand, 1, 1, /* 0x4c */
X "\tdec\tbp", sbhand, 1, 1, /* 0x4d */
X "\tdec\tsi", sbhand, 1, 1, /* 0x4e */
X "\tdec\tdi", sbhand, 1, 1, /* 0x4f */
X "\tpush\tax", sbhand, 1, 1, /* 0x50 */
X "\tpush\tcx", sbhand, 1, 1, /* 0x51 */
X "\tpush\tdx", sbhand, 1, 1, /* 0x52 */
X "\tpush\tbx", sbhand, 1, 1, /* 0x53 */
X "\tpush\tsp", sbhand, 1, 1, /* 0x54 */
X "\tpush\tbp", sbhand, 1, 1, /* 0x55 */
X "\tpush\tsi", sbhand, 1, 1, /* 0x56 */
X "\tpush\tdi", sbhand, 1, 1, /* 0x57 */
X "\tpop\tax", sbhand, 1, 1, /* 0x58 */
X "\tpop\tcx", sbhand, 1, 1, /* 0x59 */
X "\tpop\tdx", sbhand, 1, 1, /* 0x5a */
X "\tpop\tbx", sbhand, 1, 1, /* 0x5b */
X "\tpop\tsp", sbhand, 1, 1, /* 0x5c */
X "\tpop\tbp", sbhand, 1, 1, /* 0x5d */
X "\tpop\tsi", sbhand, 1, 1, /* 0x5e */
X "\tpop\tdi", sbhand, 1, 1, /* 0x5f */
X NULL, dfhand, 0, 0, /* 0x60 */
X NULL, dfhand, 0, 0, /* 0x61 */
X NULL, dfhand, 0, 0, /* 0x62 */
X NULL, dfhand, 0, 0, /* 0x63 */
X NULL, dfhand, 0, 0, /* 0x64 */
X NULL, dfhand, 0, 0, /* 0x65 */
X NULL, dfhand, 0, 0, /* 0x66 */
X NULL, dfhand, 0, 0, /* 0x67 */
X NULL, dfhand, 0, 0, /* 0x68 */
X NULL, dfhand, 0, 0, /* 0x69 */
X NULL, dfhand, 0, 0, /* 0x6a */
X NULL, dfhand, 0, 0, /* 0x6b */
X NULL, dfhand, 0, 0, /* 0x6c */
X NULL, dfhand, 0, 0, /* 0x6d */
X NULL, dfhand, 0, 0, /* 0x6e */
X NULL, dfhand, 0, 0, /* 0x6f */
X "\tjo", sjhand, 2, 2, /* 0x70 */
X "\tjno", sjhand, 2, 2, /* 0x71 */
X "\tjc", sjhand, 2, 2, /* 0x72 */
X "\tjnc", sjhand, 2, 2, /* 0x73 */
X "\tjz", sjhand, 2, 2, /* 0x74 */
X "\tjnz", sjhand, 2, 2, /* 0x75 */
X "\tjna", sjhand, 2, 2, /* 0x76 */
X "\tja", sjhand, 2, 2, /* 0x77 */
X "\tjs", sjhand, 2, 2, /* 0x78 */
X "\tjns", sjhand, 2, 2, /* 0x79 */
X "\tjp", sjhand, 2, 2, /* 0x7a */
X "\tjnp", sjhand, 2, 2, /* 0x7b */
X "\tjl", sjhand, 2, 2, /* 0x7c */
X "\tjnl", sjhand, 2, 2, /* 0x7d */
X "\tjng", sjhand, 2, 2, /* 0x7e */
X "\tjg", sjhand, 2, 2, /* 0x7f */
X AMBIG, imhand, 3, 5, /* 0x80 */
X AMBIG, imhand, 4, 6, /* 0x81 */
X AMBIG, imhand, 3, 5, /* 0x82 */
X AMBIG, imhand, 3, 5, /* 0x83 */
X TEST, mvhand, 2, 4, /* 0x84 */
X TEST, mvhand, 2, 4, /* 0x85 */
X "\txchg", mvhand, 2, 4, /* 0x86 */
X "\txchg", mvhand, 2, 4, /* 0x87 */
X MOV, mvhand, 2, 4, /* 0x88 */
X MOV, mvhand, 2, 4, /* 0x89 */
X MOV, mvhand, 2, 4, /* 0x8a */
X MOV, mvhand, 2, 4, /* 0x8b */
X MOV, mshand, 2, 4, /* 0x8c */
X "\tlea", mvhand, 2, 4, /* 0x8d */
X MOV, mshand, 2, 4, /* 0x8e */
X "\tpop", pohand, 2, 4, /* 0x8f */
X "\tnop", sbhand, 1, 1, /* 0x90 */
X "\txchg\tax,cx", sbhand, 1, 1, /* 0x91 */
X "\txchg\tax,dx", sbhand, 1, 1, /* 0x92 */
X "\txchg\tax,bx", sbhand, 1, 1, /* 0x93 */
X "\txchg\tax,sp", sbhand, 1, 1, /* 0x94 */
X "\txchg\tax,bp", sbhand, 1, 1, /* 0x95 */
X "\txchg\tax,si", sbhand, 1, 1, /* 0x96 */
X "\txchg\tax,di", sbhand, 1, 1, /* 0x97 */
X "\tcbw", sbhand, 1, 1, /* 0x98 */
X "\tcwd", sbhand, 1, 1, /* 0x99 */
X "\tcalli", cihand, 5, 5, /* 0x9a */
X "\twait", sbhand, 1, 1, /* 0x9b */
X "\tpushf", sbhand, 1, 1, /* 0x9c */
X "\tpopf", sbhand, 1, 1, /* 0x9d */
X "\tsahf", sbhand, 1, 1, /* 0x9e */
X "\tlahf", sbhand, 1, 1, /* 0x9f */
X MOV, mqhand, 3, 3, /* 0xa0 */
X MOV, mqhand, 3, 3, /* 0xa1 */
X MOV, mqhand, 3, 3, /* 0xa2 */
X MOV, mqhand, 3, 3, /* 0xa3 */
X "\tmovb", sbhand, 1, 1, /* 0xa4 */
X "\tmovw", sbhand, 1, 1, /* 0xa5 */
X "\tcmpb", sbhand, 1, 1, /* 0xa6 */
X "\tcmpw", sbhand, 1, 1, /* 0xa7 */
X TEST, tqhand, 2, 2, /* 0xa8 */
X TEST, tqhand, 3, 3, /* 0xa9 */
X "\tstob", sbhand, 1, 1, /* 0xaa */
X "\tstow", sbhand, 1, 1, /* 0xab */
X "\tlodb", sbhand, 1, 1, /* 0xac */
X "\tlodw", sbhand, 1, 1, /* 0xad */
X "\tscab", sbhand, 1, 1, /* 0xae */
X "\tscaw", sbhand, 1, 1, /* 0xaf */
X "\tmov\tal,", mihand, 2, 2, /* 0xb0 */
X "\tmov\tcl,", mihand, 2, 2, /* 0xb1 */
X "\tmov\tdl,", mihand, 2, 2, /* 0xb2 */
X "\tmov\tbl,", mihand, 2, 2, /* 0xb3 */
X "\tmov\tah,", mihand, 2, 2, /* 0xb4 */
X "\tmov\tch,", mihand, 2, 2, /* 0xb5 */
X "\tmov\tdh,", mihand, 2, 2, /* 0xb6 */
X "\tmov\tbh,", mihand, 2, 2, /* 0xb7 */
X "\tmov\tax,", mihand, 3, 3, /* 0xb8 */
X "\tmov\tcx,", mihand, 3, 3, /* 0xb9 */
X "\tmov\tdx,", mihand, 3, 3, /* 0xba */
X "\tmov\tbx,", mihand, 3, 3, /* 0xbb */
X "\tmov\tsp,", mihand, 3, 3, /* 0xbc */
X "\tmov\tbp,", mihand, 3, 3, /* 0xbd */
X "\tmov\tsi,", mihand, 3, 3, /* 0xbe */
X "\tmov\tdi,", mihand, 3, 3, /* 0xbf */
X NULL, dfhand, 0, 0, /* 0xc0 */
X NULL, dfhand, 0, 0, /* 0xc1 */
X "\tret", rehand, 3, 3, /* 0xc2 */
X "\tret", sbhand, 1, 1, /* 0xc3 */
X "\tles", mvhand, 2, 4, /* 0xc4 */
X "\tlds", mvhand, 2, 4, /* 0xc5 */
X MOV, mmhand, 3, 5, /* 0xc6 */
X MOV, mmhand, 4, 6, /* 0xc7 */
X NULL, dfhand, 0, 0, /* 0xc8 */
X NULL, dfhand, 0, 0, /* 0xc9 */
X "\treti", rehand, 3, 3, /* 0xca */
X "\treti", sbhand, 1, 1, /* 0xcb */
X "\tint", sbhand, 1, 1, /* 0xcc */
X "\tint", inhand, 2, 2, /* 0xcd */
X "\tinto", sbhand, 1, 1, /* 0xce */
X "\tiret", sbhand, 1, 1, /* 0xcf */
X AMBIG, srhand, 2, 4, /* 0xd0 */
X AMBIG, srhand, 2, 4, /* 0xd1 */
X AMBIG, srhand, 2, 4, /* 0xd2 */
X AMBIG, srhand, 2, 4, /* 0xd3 */
X "\taam", aahand, 2, 2, /* 0xd4 */
X "\taad", aahand, 2, 2, /* 0xd5 */
X NULL, dfhand, 0, 0, /* 0xd6 */
X "\txlat", sbhand, 1, 1, /* 0xd7 */
X ESC, eshand, 2, 2, /* 0xd8 */
X ESC, eshand, 2, 2, /* 0xd9 */
X ESC, eshand, 2, 2, /* 0xda */
X ESC, eshand, 2, 2, /* 0xdb */
X ESC, eshand, 2, 2, /* 0xdc */
X ESC, eshand, 2, 2, /* 0xdd */
X ESC, eshand, 2, 2, /* 0xde */
X ESC, eshand, 2, 2, /* 0xdf */
X "\tloopne", sjhand, 2, 2, /* 0xe0 */
X "\tloope", sjhand, 2, 2, /* 0xe1 */
X "\tloop", sjhand, 2, 2, /* 0xe2 */
X "\tjcxz", sjhand, 2, 2, /* 0xe3 */
X "\tin", iohand, 2, 2, /* 0xe4 */
X "\tinw", iohand, 2, 2, /* 0xe5 */
X "\tout", iohand, 2, 2, /* 0xe6 */
X "\toutw", iohand, 2, 2, /* 0xe7 */
X "\tcall", ljhand, 3, 3, /* 0xe8 */
X "\tjmp", ljhand, 3, 3, /* 0xe9 */
X "\tjmpi", cihand, 5, 5, /* 0xea */
X "\tj", sjhand, 2, 2, /* 0xeb */
X "\tin", sbhand, 1, 1, /* 0xec */
X "\tinw", sbhand, 1, 1, /* 0xed */
X "\tout", sbhand, 1, 1, /* 0xee */
X "\toutw", sbhand, 1, 1, /* 0xef */
X "\tlock", sbhand, 1, 1, /* 0xf0 */
X NULL, dfhand, 0, 0, /* 0xf1 */
X "\trepnz", sbhand, 1, 1, /* 0xf2 */
X "\trepz", sbhand, 1, 1, /* 0xf3 */
X "\thlt", sbhand, 1, 1, /* 0xf4 */
X "\tcmc", sbhand, 1, 1, /* 0xf5 */
X AMBIG, mahand, 2, 5, /* 0xf6 */
X AMBIG, mahand, 2, 6, /* 0xf7 */
X "\tclc", sbhand, 1, 1, /* 0xf8 */
X "\tstc", sbhand, 1, 1, /* 0xf9 */
X "\tcli", sbhand, 1, 1, /* 0xfa */
X "\tsti", sbhand, 1, 1, /* 0xfb */
X "\tcld", sbhand, 1, 1, /* 0xfc */
X "\tstd", sbhand, 1, 1, /* 0xfd */
X AMBIG, mjhand, 2, 4, /* 0xfe */
X AMBIG, mjhand, 2, 4 /* 0xff */
X };
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This simple routine returns the name field of a symbol *
X * table entry as a printable string. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
char *
getnam(k)
X
X register int k;
X
X{/* * * * * * * * * * START OF getnam() * * * * * * * * * */
X
X register int j;
X static char a[9];
X
X for (j = 0; j < 8; ++j)
X if ( ! symtab[k].n_name[j] )
X break;
X else
X a[j] = symtab[k].n_name[j];
X
X a[j] = '\0';
X
X return (a);
X
X}/* * * * * * * * * * * END OF getnam() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This function is responsible for mucking through the *
X * relocation table in search of externally referenced *
X * symbols to be output as operands. It accepts two long *
X * arguments: the code-segment location at which an extern *
X * reference is expected, and the offset value which is *
X * embedded in the object code and used at link time to *
X * bias the external value. In the most typical case, the *
X * function will be called by lookup(), which always makes *
X * a check for external names before searching the symbol *
X * table proper. However, it may also be called directly *
X * by any function (such as the move-immediate handler) *
X * which wants to make an independent check for externals. *
X * The caller is expected to supply, as the third argument *
X * to the function, a pointer to a character buffer large *
X * enough to hold any possible output string. Lookext() *
X * will fill this buffer and return a logical TRUE if it *
X * finds an extern reference; otherwise, it will return a *
X * logical FALSE, leaving the buffer undisturbed. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
int
lookext(off,loc,buf)
X
X long off, loc;
X char *buf;
X
X{/* * * * * * * * * * START OF lookext() * * * * * * * * * */
X
X register int k;
X char c[16];
X
X if ((loc != -1L) && (relptr >= 0))
X for (k = 0; k <= relptr; ++k)
X if ((relo[k].r_vaddr == loc)
X && (relo[k].r_symndx < S_BSS))
X {
X strcpy(buf,getnam(relo[k].r_symndx));
X if (off)
X {
X if (off < 0)
X sprintf(c,"%ld",off);
X else
X sprintf(c,"+%ld",off);
X strcat(buf,c);
X }
X return (1);
X }
X
X return (0);
X
X}/* * * * * * * * * * END OF lookext() * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This function finds an entry in the symbol table by *
X * value. Its input is a (long) machine address, and its *
X * output is a pointer to a string containing the corre- *
X * sponding symbolic name. The function first searches the *
X * relocation table for a possible external reference; if *
X * none is found, a linear search of the symbol table is *
X * undertaken. If no matching symbol has been found at the *
X * end of these searches, the function returns a pointer *
X * to a string containing the ASCII equivalent of the ad- *
X * dress which was to be located, so that, regardless of *
X * the success of the search, the function's return value *
X * is suitable for use as a memory-reference operand. The *
X * caller specifies the type of symbol to be found (text, *
X * data, bss, undefined, absolute, or common) by means of *
X * the function's second parameter. The third parameter *
X * specifies the format to be used in the event of a nu- *
X * meric output: zero for absolute format, one for short *
X * relative format, two for long relative format. The *
X * fourth parameter is the address which would appear in *
X * the relocation table for the reference in question, or *
X * -1 if the relocation table is not to be searched. The *
X * function attempts to apply a certain amount of intelli- *
X * gence in its selection of symbols, so it is possible *
X * that, in the absence of a type match, a symbol of the *
X * correct value but different type will be returned. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
char *
lookup(addr,type,kind,ext)
X
X long addr; /* Machine address to be located */
X
X int type, /* Type of symbol to be matched */
X kind; /* Addressing output mode to use */
X
X long ext; /* Value for extern ref, if any */
X
X{/* * * * * * * * * * START OF lookup() * * * * * * * * * */
X
X register int j, k;
X static char b[64];
X
X struct
X {
X int i;
X int t;
X }
X best;
X
X if (lookext(addr,ext,b))
X return (b);
X
X if (segflg)
X if (segflg & 1)
X type = N_TEXT;
X else
X type = N_DATA;
X
X for (k = 0, best.i = -1; k <= symptr; ++k)
X if (symtab[k].n_value == addr)
X if ((j = symtab[k].n_sclass & N_SECT) == type)
X {
X best.t = j;
X best.i = k;
X break;
X }
X else if (segflg || (HDR.a_flags & A_SEP))
X continue;
X else if (best.i < 0)
X best.t = j, best.i = k;
X else if (symrank[type][j] > symrank[type][best.t])
X best.t = j, best.i = k;
X
X if (best.i >= 0)
X return (getnam(best.i));
X
X if (kind == LOOK_ABS)
X sprintf(b,"0x%05.5x",addr);
X else
X {
X long x = addr - (PC - kind);
X if (x < 0)
X sprintf(b,".%ld",x);
X else
X sprintf(b,".+%ld",x);
X }
X
X return (b);
X
X}/* * * * * * * * * * * END OF lookup() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This function translates an 8088 addressing mode byte *
X * to an equivalent assembler string, returning a pointer *
X * thereto. If necessary, it performs successive inputs *
X * of bytes from the object file in order to obtain offset *
X * data, adjusting PC accordingly. (The addressing mode *
X * byte appears in several 8088 opcodes; it is used to *
X * specify source and destination operand locations.) The *
X * third argument to the function is zero if the standard *
X * registers are to be used, or eight if the segment reg- *
X * isters are to be used; these constants are defined sym- *
X * bolically in dis.h. NOTE: The mtrans() function must *
X * NEVER be called except immediately after fetching the *
X * mode byte. If any additional object bytes are fetched *
X * after the fetch of the mode byte, mtrans() will not *
X * produce correct output! *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
char *
mtrans(c,m,type)
X
X register int c; /* Primary instruction byte */
X register int m; /* Addressing mode byte */
X
X int type; /* Type code: standard or seg */
X
X{/* * * * * * * * * * START OF mtrans() * * * * * * * * * */
X
X unsigned long pc;
X int offset, oflag, dir, w, mod, reg, rm;
X static char a[100];
X static char b[30];
X
X offset = 0;
X dir = c & 2;
X w = c & 1;
X mod = (m & 0xc0) >> 6;
X reg = (m & 0x38) >> 3;
X rm = m & 7;
X pc = PC + 1;
X
X if (type)
X w = 1;
X
X if ((oflag = mod) > 2)
X oflag = 0;
X
X if (oflag)
X {
X int j, k;
X if (oflag == 2)
X {
X FETCH(j);
X FETCH(k);
X offset = (k << 8) | j;
X }
X else
X {
X FETCH(j);
X if (j & 0x80)
X k = 0xff00;
X else
X k = 0;
X offset = k | j;
X }
X }
X
X if (dir)
X {
X strcpy(a,REGS[type + ((w << 3) | reg)]);
X strcat(a,",");
X switch (mod)
X {
X case 0 :
X if (rm == 6)
X {
X int j, k;
X FETCH(j);
X FETCH(k);
X offset = (k << 8) | j;
X strcat(a,
X lookup((long)(offset),N_DATA,LOOK_ABS,pc));
X }
X else
X {
X sprintf(b,"(%s)",REGS0[rm]);
X strcat(a,b);
X }
X break;
X case 1 :
X case 2 :
X if (mod == 1)
X strcat(a,"*");
X else
X strcat(a,"#");
X sprintf(b,"%d(",offset);
X strcat(a,b);
X strcat(a,REGS1[rm]);
X strcat(a,")");
X break;
X case 3 :
X strcat(a,REGS[(w << 3) | rm]);
X break;
X }
X }
X else
X {
X switch (mod)
X {
X case 0 :
X if (rm == 6)
X {
X int j, k;
X FETCH(j);
X FETCH(k);
X offset = (k << 8) | j;
X strcpy(a,
X lookup((long)(offset),N_DATA,LOOK_ABS,pc));
X }
X else
X {
X sprintf(b,"(%s)",REGS0[rm]);
X strcpy(a,b);
X }
X break;
X case 1 :
X case 2 :
X if (mod == 1)
X strcpy(a,"*");
X else
X strcpy(a,"#");
X sprintf(b,"%d(",offset);
X strcat(a,b);
X strcat(a,REGS1[rm]);
X strcat(a,")");
X break;
X case 3 :
X strcpy(a,REGS[(w << 3) | rm]);
X break;
X }
X strcat(a,",");
X strcat(a,REGS[type + ((w << 3) | reg)]);
X }
X
X return (a);
X
X}/* * * * * * * * * * * END OF mtrans() * * * * * * * * * * */
X
X /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
X * *
X * This simple routine truncates a string returned by the *
X * mtrans() function, removing its source operand. This is *
X * useful in handlers which ignore the "reg" field of the *
X * mode byte. *
X * *
X * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
X
void
mtrunc(a)
X
X register char *a; /* Ptr. to string to truncate */
X
X{/* * * * * * * * * * START OF mtrunc() * * * * * * * * * */
X
X register int k;
X
X for (k = strlen(a) - 1; k >= 0; --k)
X if (a[k] == ',')
X {
X a[k] = '\0';
X break;
X }
X
X}/* * * * * * * * * * * END OF mtrunc() * * * * * * * * * * */
X
X
END_OF_FILE
if test 30238 -ne `wc -c <'distabs.c'`; then
echo shar: \"'distabs.c'\" unpacked with wrong size!
fi
# end of 'distabs.c'
fi
echo shar: End of archive 2 \(of 2\).
cp /dev/null ark2isdone
MISSING=""
for I in 1 2 ; do
if test ! -f ark${I}isdone ; then
MISSING="${MISSING} ${I}"
fi
done
if test "${MISSING}" = "" ; then
echo You have unpacked both archives.
rm -f ark[1-9]isdone
else
echo You still need to unpack the following archives:
echo " " ${MISSING}
fi
## End of shell archive.
exit 0
--
Please send comp.sources.unix-related mail to rsalz@uunet.uu.net.