forked from KolibriOS/kolibrios
1057 lines
19 KiB
C
1057 lines
19 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//
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// gas to MASM source code converter
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_TOKENS 100
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#define MAX_TOKEN_LENGTH 1024
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#define LF 0x0A
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typedef enum {NOT_WHITESPACE, WHITESPACE, TOKEN_AVAILABLE, LINE_DONE, FILE_DONE, PARSED_OKAY} tokenstat;
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typedef enum {NOSEG, DATASEG, TEXTSEG} segtype;
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int tokennum;
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int inline, outline;
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char *token;
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char tokens[MAX_TOKENS][MAX_TOKEN_LENGTH+1];
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segtype currentseg = NOSEG;
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typedef struct {
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char *text;
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char *emit;
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int numtokens;
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void (*parsefunc) (void);
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} parsefield;
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void errorexit (void);
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//==============================================
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typedef struct {
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char *text;
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char *emit;
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int len;
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} regdesc;
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regdesc reglist[] = {
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{"%eax", "eax", 4},
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{"%ebx", "ebx", 4},
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{"%ecx", "ecx", 4},
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{"%edx", "edx", 4},
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{"%esi", "esi", 4},
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{"%edi", "edi", 4},
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{"%ebp", "ebp", 4},
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{"%esp", "esp", 4},
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{"%ax", "ax", 3},
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{"%bx", "bx", 3},
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{"%cx", "cx", 3},
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{"%dx", "dx", 3},
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{"%si", "si", 3},
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{"%di", "di", 3},
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{"%bp", "bp", 3},
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{"%sp", "sp", 3},
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{"%al", "al", 3},
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{"%bl", "bl", 3},
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{"%cl", "cl", 3},
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{"%dl", "dl", 3},
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{"%ah", "ah", 3},
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{"%bh", "bh", 3},
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{"%ch", "ch", 3},
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{"%dh", "dh", 3},
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{"%st(0)", "st(0)", 6},
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{"%st(1)", "st(1)", 6},
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{"%st(2)", "st(2)", 6},
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{"%st(3)", "st(3)", 6},
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{"%st(4)", "st(4)", 6},
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{"%st(5)", "st(5)", 6},
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{"%st(6)", "st(6)", 6},
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{"%st(7)", "st(7)", 6},
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};
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int numregs = sizeof (reglist) / sizeof (reglist[0]);
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//==============================================
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void emitanoperand (int tnum, char *type, int notdata)
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{
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int i, index, something_outside_parens, regfound;
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int parencount;
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char *pt;
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char temp[MAX_TOKEN_LENGTH+1];
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pt = tokens[tnum];
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if (pt[0] == '%')
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{
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// register
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for (i=0 ; i<numregs ; i++)
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{
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if (!strcmpi (pt, reglist[i].text))
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{
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printf ("%s", reglist[i].emit);
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return;
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}
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}
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fprintf (stderr, "Error: bad register %s\n", pt);
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errorexit ();
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}
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else if (pt[0] == '$')
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{
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// constant
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if (pt[1] == '(')
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{
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if ((pt[2] > '9') || (pt[2] < '0'))
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{
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i = 2;
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printf ("offset ");
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parencount = 1;
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while ((pt[i] != ')') || (parencount > 1))
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{
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if (!pt[i])
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{
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fprintf (stderr, "mismatched parens");
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errorexit ();
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}
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if (pt[i] == ')')
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parencount--;
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else if (pt[i] == '(')
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parencount++;
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printf ("%c", pt[i]);
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i++;
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}
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}
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else
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{
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pt++;
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parencount = 1;
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for (i=1 ; (pt[i] != ')') || (parencount > 1) ; i++)
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{
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if (!pt[i])
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{
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fprintf (stderr, "mismatched parens");
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errorexit ();
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}
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if (pt[i] == ')')
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parencount--;
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else if (pt[i] == '(')
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parencount++;
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}
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pt[i] = 0;
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if ((pt[1] == '0') && ((pt[2] == 'x') || (pt[2] == 'X')))
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{
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printf ("0%sh", &pt[3]);
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}
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else
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{
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printf ("%s", &pt[1]);
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}
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}
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}
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else if ((pt[1] == '0') && ((pt[2] == 'x') || (pt[2] == 'X')))
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{
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printf ("0%sh", &pt[3]);
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}
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else if ((pt[1] >= '0') && (pt[1] <= '9'))
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{
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printf ("%s", &pt[1]);
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}
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else
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{
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printf ("offset %s", &pt[1]);
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}
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}
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else if (!notdata && ((pt[0] >= '0') && (pt[0] <= '9')))
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{
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pt--;
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if ((pt[1] == '0') && ((pt[2] == 'x') || (pt[2] == 'X')))
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{
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printf ("0%sh", &pt[3]);
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}
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else
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{
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printf ("%s", &pt[1]);
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}
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}
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else
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{
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// must be a memory location
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strcpy (temp, type);
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index = strlen (temp);
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if (notdata)
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temp[index++] = '[';
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something_outside_parens = 0;
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while (*pt)
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{
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if (index > (MAX_TOKEN_LENGTH - 10))
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{
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fprintf (stderr, "Error: operand too long %s\n",
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tokens[tnum]);
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errorexit ();
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}
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if (*pt != ')')
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{
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if (*pt == '(')
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{
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if (something_outside_parens)
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temp[index++] = '+';
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}
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else if (*pt == '%')
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{
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regfound = 0;
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for (i=0 ; i<numregs ; i++)
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{
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if (!strnicmp (pt, reglist[i].text,
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reglist[i].len))
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{
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strcpy (&temp[index], reglist[i].emit);
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index += strlen (reglist[i].emit);
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pt += strlen (reglist[i].text) - 1;
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regfound = 1;
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break;
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}
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}
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if (!regfound)
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{
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fprintf (stderr, "Error: bad register %s\n", pt);
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errorexit ();
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}
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}
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else if (*pt == ',')
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{
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pt++;
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if ((*pt >= '1') && (*pt <= '8'))
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{
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temp[index++] = '*';
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temp[index++] = *pt;
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}
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else if (*pt != ')')
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{
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if (temp[index-1] != '+')
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temp[index++] = '+';
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}
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}
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else
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{
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something_outside_parens = 1;
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// handle hexadecimal constants in addresses
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if ((*pt == '0') &&
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((*(pt+1) == 'x') || (*(pt+1) == 'X')))
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{
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pt += 2;
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do
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{
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temp[index++] = *pt++;
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} while (((*pt >= '0') && (*pt <= '9')) ||
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((*pt >= 'a') && (*pt <= 'f')) ||
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((*pt >= 'A') && (*pt <= 'F')));
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pt--;
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temp[index++] = 'h';
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}
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else
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{
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temp[index++] = *pt;
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}
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}
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}
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pt++;
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}
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if (notdata)
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temp[index++] = ']';
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temp[index] = 0;
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printf ("%s", temp);
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}
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}
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void datasegstart (void)
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{
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if (currentseg == DATASEG)
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return;
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if (currentseg == TEXTSEG)
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printf ("_TEXT ENDS\n");
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printf ("_DATA SEGMENT");
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currentseg = DATASEG;
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}
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void textsegstart (void)
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{
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if (currentseg == TEXTSEG)
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return;
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if (currentseg == DATASEG)
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printf ("_DATA ENDS\n");
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printf ("_TEXT SEGMENT");
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currentseg = TEXTSEG;
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}
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void emitdata (void)
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{
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int i;
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for (i=1 ; i<(tokennum-1) ; i++)
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printf (" %s,", tokens[i]);
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printf (" %s", tokens[tokennum-1]);
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}
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void emitonedata (void)
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{
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printf (" %s", tokens[1]);
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}
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void emitonecalldata (void)
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{
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int i, isaddr, len;
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if (tokens[1][0] == '*')
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{
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printf (" dword ptr[%s]", &tokens[1][1]);
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}
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else
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{
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isaddr = 0;
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len = strlen(tokens[1]);
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for (i=0 ; i<len ; i++)
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{
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if (tokens[1][i] == '(')
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{
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isaddr = 1;
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break;
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}
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}
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if (!isaddr)
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{
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printf (" near ptr %s", tokens[1]);
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}
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else
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{
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emitanoperand (1, " dword ptr", 1);
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}
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}
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}
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void emitonejumpdata (void)
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{
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int i, isaddr, len;
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if (tokens[1][0] == '*')
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{
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printf (" dword ptr[%s]", &tokens[1][1]);
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}
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else
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{
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isaddr = 0;
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len = strlen(tokens[1]);
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for (i=0 ; i<len ; i++)
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{
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if (tokens[1][i] == '(')
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{
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isaddr = 1;
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break;
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}
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}
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if (!isaddr)
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{
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printf (" %s", tokens[1]);
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}
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else
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{
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emitanoperand (1, " dword ptr", 1);
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}
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}
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}
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void emitexterndef (void)
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{
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printf (" %s:dword", tokens[1]);
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}
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void nooperands (void)
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{
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}
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void emitoneoperandl (void)
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{
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printf (" ");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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void emitoneoperandb (void)
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{
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printf (" ");
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emitanoperand (1, "ds:byte ptr", 1);
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}
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void emitoneoperandw (void)
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{
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printf (" ");
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emitanoperand (1, "ds:word ptr", 1);
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}
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void emittwooperandsl (void)
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{
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printf (" ");
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emitanoperand (2, "ds:dword ptr", 1);
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printf (",");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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void emittwooperandsb (void)
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{
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printf (" ");
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emitanoperand (2, "ds:byte ptr", 1);
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printf (",");
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emitanoperand (1, "ds:byte ptr", 1);
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}
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void emittwooperandsw (void)
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{
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printf (" ");
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emitanoperand (2, "ds:word ptr", 1);
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printf (",");
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emitanoperand (1, "ds:word ptr", 1);
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}
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void emit_0_or_1_operandsl (void)
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{
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if (tokennum == 2)
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{
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printf (" ");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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}
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void emit_1_or_2_operandsl (void)
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{
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int j;
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if (tokennum == 2)
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{
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printf (" ");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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else if (tokennum == 3)
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{
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printf (" ");
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emitanoperand (2, "ds:dword ptr", 1);
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printf (",");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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else
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{
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fprintf (stderr, "Error: too many operands\n");
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for (j=0 ; j<tokennum ; j++)
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fprintf (stderr, "%s\n", tokens[j]);
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fprintf (stderr, "\n");
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errorexit ();
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}
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}
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void emit_1_or_2_operandsl_vartext (char *str0, char *str1)
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{
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int j;
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if (tokennum == 2)
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{
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printf (" %s ", str0);
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emitanoperand (1, "ds:dword ptr", 1);
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}
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else if (tokennum == 3)
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{
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if (!strcmpi (tokens[2], "%st(0)"))
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printf (" %s ", str0);
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else
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printf (" %s ", str1);
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emitanoperand (2, "ds:dword ptr", 1);
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printf (",");
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emitanoperand (1, "ds:dword ptr", 1);
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}
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else
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{
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fprintf (stderr, "Error: too many operands\n");
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for (j=0 ; j<tokennum ; j++)
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fprintf (stderr, "%s\n", tokens[j]);
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fprintf (stderr, "\n");
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errorexit ();
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}
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|
}
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|
|
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void special_fdivl (void)
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{
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emit_1_or_2_operandsl_vartext ("fdiv", "fdivr");
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}
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void special_fdivpl (void)
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|
{
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emit_1_or_2_operandsl_vartext ("fdivp", "fdivrp");
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}
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void special_fdivrl (void)
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|
{
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emit_1_or_2_operandsl_vartext ("fdivr", "fdiv");
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}
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void special_fdivrpl (void)
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{
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emit_1_or_2_operandsl_vartext ("fdivrp", "fdivp");
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}
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void special_fsubl (void)
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{
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emit_1_or_2_operandsl_vartext ("fsub", "fsubr");
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}
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void special_fsubpl (void)
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{
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emit_1_or_2_operandsl_vartext ("fsubp", "fsubrp");
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}
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|
|
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void special_fsubrl (void)
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|
{
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|
emit_1_or_2_operandsl_vartext ("fsubr", "fsub");
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}
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|
|
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void special_fsubrpl (void)
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{
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emit_1_or_2_operandsl_vartext ("fsubrp", "fsubp");
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}
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|
|
|
|
void emit_multiple_data (void)
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|
{
|
|
int i;
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|
|
printf (" ");
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|
|
for (i=1 ; i<(tokennum-1) ; i++)
|
|
{
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|
emitanoperand (i, "", 0);
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|
printf (", ");
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|
}
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|
|
emitanoperand (i, "", 0);
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|
}
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//==============================================
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parsefield parsedata[] = {
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{".align", " align", 2, emitonedata},
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{".byte", " db", -2, emit_multiple_data},
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{".data", "", 1, datasegstart},
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{".extern"," externdef", 2, emitexterndef},
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{".globl", " public", -2, emit_multiple_data},
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{".long", " dd", -2, emit_multiple_data},
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{".single"," dd", -2, emit_multiple_data},
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{".text", "", 1, textsegstart},
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{"adcl", " adc", 3, emittwooperandsl},
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{"addb", " add", 3, emittwooperandsb},
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{"addl", " add", 3, emittwooperandsl},
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{"andb", " and", 3, emittwooperandsb},
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{"andl", " and", 3, emittwooperandsl},
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{"call", " call", 2, emitonecalldata},
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{"cmpb", " cmp", 3, emittwooperandsb},
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{"cmpl", " cmp", 3, emittwooperandsl},
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{"cmpw", " cmp", 3, emittwooperandsw},
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{"decl", " dec", 2, emitoneoperandl},
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{"decw", " dec", 2, emitoneoperandw},
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{"divl", " div", 2, emitoneoperandl},
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{"fadd", " fadd", -2, emit_1_or_2_operandsl},
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{"faddp", " faddp", -2, emit_1_or_2_operandsl},
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{"faddps", " faddp", -2, emit_1_or_2_operandsl},
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{"fadds", " fadd", -2, emit_1_or_2_operandsl},
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{"fcom", " fcom", 2, emitoneoperandl},
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{"fcoms", " fcom", 2, emitoneoperandl},
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{"fcomp", " fcomp", 2, emitoneoperandl},
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{"fcomps", " fcomp", 2, emitoneoperandl},
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{"fdiv", "", -2, special_fdivl},
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{"fdivp", "", -2, special_fdivpl},
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{"fdivr", "", -2, special_fdivrl},
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{"fdivrp", "", -2, special_fdivrpl},
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{"fdivrs", "", -2, special_fdivrl},
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{"fildl", " fild", 2, emitoneoperandl},
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{"fistl", " fist", 2, emitoneoperandl},
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{"fistpl", " fistp", 2, emitoneoperandl},
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{"fld", " fld", 2, emitoneoperandl},
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{"fldcw", " fldcw", 2, emitoneoperandw},
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{"fldenv", " fldenv", 2, emitoneoperandl},
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{"flds", " fld", 2, emitoneoperandl},
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{"fmul", " fmul", -2, emit_1_or_2_operandsl},
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{"fmulp", " fmulp", -2, emit_1_or_2_operandsl},
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{"fmulps", " fmulp", -2, emit_1_or_2_operandsl},
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{"fmuls", " fmul", -2, emit_1_or_2_operandsl},
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{"fnstcw", " fnstcw", 2, emitoneoperandw},
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{"fnstenv"," fnstenv", 2, emitoneoperandl},
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{"fnstsw", " fnstsw", 2, emitoneoperandw},
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{"fstp", " fstp", 2, emitoneoperandl},
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{"fstps", " fstp", 2, emitoneoperandl},
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{"fsts", " fst", 2, emitoneoperandl},
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{"fsubr", "", -2, special_fsubrl},
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{"fsubrp", "", -2, special_fsubrpl},
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{"fsubrs", "", -2, special_fsubrl},
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{"fsub", "", -2, special_fsubl},
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{"fsubp", "", -2, special_fsubpl},
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{"fsubps", "", -2, special_fsubpl},
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{"fsubs", "", -2, special_fsubl},
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{"fxch", " fxch", 2, emitoneoperandl},
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{"imull", " imul", -2, emit_1_or_2_operandsl},
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{"incl", " inc", 2, emitoneoperandl},
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{"ja", " ja", 2, emitonedata},
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{"jae", " jae", 2, emitonedata},
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{"jb", " jb", 2, emitonedata},
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{"jbe", " jbe", 2, emitonedata},
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{"jc", " jc", 2, emitonedata},
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{"je", " je", 2, emitonedata},
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{"jg", " jg", 2, emitonedata},
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{"jge", " jge", 2, emitonedata},
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{"jl", " jl", 2, emitonedata},
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{"jle", " jle", 2, emitonedata},
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{"jmp", " jmp", 2, emitonejumpdata},
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{"jna", " jna", 2, emitonedata},
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{"jnae", " jnae", 2, emitonedata},
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{"jnb", " jnb", 2, emitonedata},
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{"jnbe", " jnbe", 2, emitonedata},
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{"jnc", " jnc", 2, emitonedata},
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{"jne", " jne", 2, emitonedata},
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{"jng", " jng", 2, emitonedata},
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{"jnge", " jnge", 2, emitonedata},
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{"jnl", " jnl", 2, emitonedata},
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{"jnle", " jnle", 2, emitonedata},
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{"jns", " jns", 2, emitonedata},
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{"jnz", " jnz", 2, emitonedata},
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{"js", " js", 2, emitonedata},
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{"jz", " jz", 2, emitonedata},
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{"leal", " lea", 3, emittwooperandsl},
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{"movb", " mov", 3, emittwooperandsb},
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{"movl", " mov", 3, emittwooperandsl},
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{"movw", " mov", 3, emittwooperandsw},
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{"negl", " neg", 2, emitoneoperandl},
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{"orb", " or", 3, emittwooperandsb},
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{"orl", " or", 3, emittwooperandsl},
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{"popl", " pop", 2, emitoneoperandl},
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{"pushl", " push", 2, emitoneoperandl},
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{"ret", " ret", -1, emit_0_or_1_operandsl},
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{"rorl", " ror", 3, emittwooperandsl},
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{"sarl", " sar", 3, emittwooperandsl},
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{"sbbl", " sbb", 3, emittwooperandsl},
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{"shll", " shl", 3, emittwooperandsl},
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{"shrl", " shr", 3, emittwooperandsl},
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{"subl", " sub", 3, emittwooperandsl},
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{"testb", " test", 3, emittwooperandsb},
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{"testl", " test", 3, emittwooperandsl},
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{"xorb", " xor", 3, emittwooperandsb},
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{"xorl", " xor", 3, emittwooperandsl},
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};
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int numparse = sizeof (parsedata) / sizeof (parsedata[0]);
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//==============================================
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void errorexit (void)
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{
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fprintf (stderr, "In line: %d, out line: %d\n", inline, outline);
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exit (1);
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}
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tokenstat whitespace (char c)
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{
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if (c == '\n')
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return LINE_DONE;
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if ((c <= ' ') ||
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(c > 127) ||
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(c == ','))
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{
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return WHITESPACE;
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}
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return NOT_WHITESPACE;
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}
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int gettoken (void)
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{
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char c;
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int count, parencount;
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tokenstat stat;
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do
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{
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if ((c = getchar ()) == EOF)
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return FILE_DONE;
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if ((stat = whitespace (c)) == LINE_DONE)
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return LINE_DONE;
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} while (stat == WHITESPACE);
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token[0] = c;
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count = 1;
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if (c == '~')
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{
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count--;
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token[count++] = 'n';
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token[count++] = 'o';
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token[count++] = 't';
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token[count++] = ' ';
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}
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if (c == '(')
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{
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do
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{
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if ((c = getchar ()) == EOF)
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{
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fprintf (stderr, "EOF in middle of parentheses\n");
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errorexit ();
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}
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token[count++] = c;
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} while (c != ')');
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}
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for ( ;; )
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{
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if ((c = getchar ()) == EOF)
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{
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token[count] = 0;
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return TOKEN_AVAILABLE;
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}
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if (whitespace (c) == LINE_DONE)
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{
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if (ungetc (c, stdin) == EOF)
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{
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fprintf (stderr, "Couldn't unget character\n");
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errorexit ();
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}
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token[count] = 0;
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return TOKEN_AVAILABLE;
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}
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if (whitespace (c) == WHITESPACE)
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{
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token[count] = 0;
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return TOKEN_AVAILABLE;
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}
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if (count >= MAX_TOKEN_LENGTH)
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{
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fprintf (stderr, "Error: token too long\n");
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errorexit ();
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}
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token[count++] = c;
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if (c == '~')
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{
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count--;
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token[count++] = 'n';
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token[count++] = 'o';
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token[count++] = 't';
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token[count++] = ' ';
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}
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else if (c == '(')
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{
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parencount = 1;
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do
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{
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if ((c = getchar ()) == EOF)
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{
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fprintf (stderr, "EOF in middle of parentheses\n");
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errorexit ();
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}
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if (c == '(')
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parencount++;
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else if (c == ')')
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parencount--;
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if (c == '~')
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{
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token[count++] = 'n';
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token[count++] = 'o';
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token[count++] = 't';
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token[count++] = ' ';
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}
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else
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{
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token[count++] = c;
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}
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} while ((c != ')') || (parencount > 0));
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}
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}
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}
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tokenstat parseline (void)
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{
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tokenstat stat;
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int i, j, firsttoken, labelfound;
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int mnemfound;
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firsttoken = 1;
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tokennum = 0;
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labelfound = 0;
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for ( ;; )
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{
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token = tokens[tokennum];
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stat = gettoken ();
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switch (stat)
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{
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case FILE_DONE:
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return FILE_DONE;
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case LINE_DONE:
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if (!firsttoken && tokennum)
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{
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mnemfound = 0;
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for (i=0 ; i<numparse; i++)
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{
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if (!strcmpi (tokens[0], parsedata[i].text))
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{
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if (((parsedata[i].numtokens > 0) &&
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(parsedata[i].numtokens != tokennum)) ||
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((parsedata[i].numtokens < 0) &&
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(tokennum < -parsedata[i].numtokens)))
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{
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fprintf (stderr, "mismatched number of tokens\n");
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for (j=0 ; j<tokennum ; j++)
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fprintf (stderr, "%s\n", tokens[j]);
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fprintf (stderr, "\n");
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errorexit ();
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}
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printf ("%s", parsedata[i].emit);
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(*parsedata[i].parsefunc) ();
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mnemfound = 1;
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break;
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}
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}
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if (!mnemfound)
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{
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fprintf (stderr, "Error: unknown mnemonic\n");
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for (j=0 ; j<tokennum ; j++)
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fprintf (stderr, "%s\n", tokens[j]);
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fprintf (stderr, "\n");
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errorexit ();
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}
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}
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if (!firsttoken)
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{
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if ((currentseg == DATASEG) && labelfound && !tokennum)
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printf (":\n");
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else
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printf ("\n");
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outline++;
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}
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return PARSED_OKAY;
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case TOKEN_AVAILABLE:
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if (firsttoken)
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{
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if (token[strlen(token) - 1] == ':')
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{
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labelfound = 1;
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if (currentseg == DATASEG)
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{
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token[strlen(token) - 1] = 0;
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printf ("%s", token);
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}
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else if (currentseg == TEXTSEG)
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{
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printf ("%s", token);
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}
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else
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{
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fprintf (stderr, "Error: not in segment block\n");
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errorexit ();
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}
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firsttoken = 0;
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break;
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}
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}
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firsttoken = 0;
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if (tokennum >= MAX_TOKENS)
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{
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fprintf (stderr, "Error: too many tokens\n");
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exit (0);
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}
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tokennum++;
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break;
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default:
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fprintf (stderr, "Error: unknown tokenstat %d\n", stat);
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exit (0);
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}
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}
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}
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void main (int argc, char **argv)
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{
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tokenstat stat;
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printf (" .386P\n"
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" .model FLAT\n");
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inline = 1;
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outline = 3;
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for ( ;; )
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{
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stat = parseline ();
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inline++;
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switch (stat)
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{
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case FILE_DONE:
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if (currentseg == TEXTSEG)
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printf ("_TEXT ENDS\n");
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else if (currentseg == DATASEG)
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printf ("_DATA ENDS\n");
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printf (" END\n");
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exit (0);
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case PARSED_OKAY:
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break;
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default:
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fprintf (stderr, "Error: unknown tokenstat %d\n", stat);
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exit (0);
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}
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}
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}
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