usr/src/sys/tahoe/inline/machdep.c

/*
 * Copyright (c) 1984 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)machdep.c   1.2 (Berkeley) %G%";
#endif

#include <stdio.h>
#include <ctype.h>
#include "inline.h"

/*
 * The routines and tables in this file must be rewritten
 * for each new machine that this program is ported to.
 */

#if defined(vax)
/*
 * Instruction stop table.
 * All instructions that implicitly modify any of the temporary
 * registers, change control flow, or implicitly loop must be
 * listed in this table. It is used to find the end of a basic
 * block when scanning backwards through the instruction stream
 * trying to merge the inline expansion.
 */
struct inststoptbl inststoptable[] = {
        { "jbc" }, { "jlbc" }, { "jbs" }, { "jlbs" }, { "jbcc" },
        { "jbsc" }, { "jbcs" }, { "jbss" }, { "jbr" }, { "jcc" },
        { "jcs" }, { "jvc" }, { "jvs" }, { "jlss" }, { "jlssu" },
        { "jleq" }, { "jlequ" }, { "jeql" }, { "jeqlu" }, { "jneq" },
        { "jnequ" }, { "jgeq" }, { "jgequ" }, { "jgtr" }, { "jgtru" },
        { "chmk" }, { "chme" }, { "chms" }, { "chmu" }, { "rei" },
        { "ldpctx" }, { "svpctx" }, { "xfc" }, { "bpt" },
        { "bugw" }, { "bugl" }, { "halt" }, { "pushr" }, { "popr" },
        { "polyf" }, { "polyd" }, { "polyg" }, { "polyh" },
        { "bneq" }, { "bnequ" }, { "beql" }, { "beqlu" }, { "bgtr" },
        { "bleq" }, { "bgeq" }, { "blss" }, { "bgtru" }, { "blequ" },
        { "bvc" }, { "bvs" }, { "bgequ" }, { "bcc" }, { "blssu" },
        { "bcs" }, { "brb" }, { "brw" }, { "jmp" },
        { "bbs" }, { "bbc" }, { "bbss" }, { "bbcs" }, { "bbsc" },
        { "bbcc" }, { "bbssi" }, { "bbcci" }, { "blbs" }, { "blbc" },
        { "acbb" }, { "acbw" }, { "acbl" }, { "acbf" }, { "acbd" },
        { "acbg" }, { "acbh" }, { "aoblss" }, { "aobleq" },
        { "sobgeq" }, { "sobgtr" }, { "caseb" }, { "casew" }, { "casel" },
        { "bsbb" }, { "bsbw" }, { "jsb" }, { "rsb" },
        { "callg" }, { "calls" }, { "ret" },
        { "movc3" }, { "movc5" }, { "movtc" }, { "movtuc" },
        { "cmpc3" }, { "cmpc5" }, { "scanc" }, { "spanc" },
        { "locc" }, { "skpc" }, { "matchc" }, { "crc" },
        { "movp" }, { "cmpp3" }, { "cmpp4" }, { "addp4" }, { "addp6" },
        { "subp4" }, { "subp6" }, { "mulp" }, { "divp" }, { "cvtlp" },
        { "cvtpl" }, { "cvtpt" }, { "cvttp" }, { "cvtps" }, { "cvtsp" },
        { "ashp" }, { "editpc" },
        { "escd" }, { "esce" }, { "escf" },
        { "" }
};

/*
 * Check to see if a line is a candidate for replacement.
 * Return pointer to name to be looked up in pattern table.
 */
char *
doreplaceon(cp)
        char *cp;
{

        if (bcmp(cp, "calls\t$", 7) == 0)
                return (cp + 7);
        return (0);
}
#endif

#if defined(tahoe)
/*
 * Instruction stop table.
 * All instructions that implicitly modify any of the temporary
 * registers, change control flow, or implicitly loop must be
 * listed in this table. It is used to find the end of a basic
 * block when scanning backwards through the instruction stream
 * trying to merge the inline expansion.
 */
struct inststoptbl inststoptable[] = {
/* control */
        { "bbssi" }, { "bcc" }, { "bcs" }, { "beql" }, { "beqlu" },
        { "bgeq" }, { "bgequ" }, { "bgtr" }, { "bgtru" }, { "bleq" },
        { "blequ" }, { "blss" }, { "blssu" }, { "bneq" }, { "bnequ" },
        { "brb" }, { "brw" }, { "bvc" }, { "bvs" }, { "jmp" },
/* jump versions of control */
        { "jbc" }, { "jbs" }, { "jeql" }, { "jeqlu" },
        { "jgeq" }, { "jgequ" }, { "jgtr" }, { "jgtru" }, { "jleq" },
        { "jlequ" }, { "jlss" }, { "jlssu" }, { "jneq" }, { "jnequ" },
        { "jcc" }, { "jcs" }, { "jvc" }, { "jvs" }, { "jbr" },
/* multiple registers */
        { "loadr" },
/* bit field */
        { "bbc" }, { "bbs" },
/* character string and block move */
        { "cmps2" }, { "cmps3" }, { "movblk" }, { "movs2" }, { "movs3" },
/* procedure call */
        { "callf" }, { "calls" }, { "ret" },
/* loop control */
        { "aobleq" }, { "aoblss" }, { "casel" },
/* privileged and miscellaneous */
        { "bpt" }, { "halt" }, { "kcall" }, { "ldpctx" }, { "rei" },
        { "svpctx" },
        { "" }
};

/*
 * Check to see if a line is a candidate for replacement.
 * Return pointer to name to be looked up in pattern table.
 */
char *
doreplaceon(cp)
        char *cp;
{

        if (bcmp(cp, "callf\t$", 7) == 0)
                return (cp + 7);
        return (0);
}
#endif

#if defined(vax) || defined(tahoe)
/*
 * Find the next argument to the function being expanded.
 */
nextarg(argc, argv)
        int argc;
        char *argv[];
{
        register char *lastarg = argv[2];

        if (argc == 3 &&
            bcmp(argv[0], "mov", 3) == 0 &&
            bcmp(argv[1], "(sp)+", 6) == 0 &&
            lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
                return (lastarg[1] - '0');
        return (-1);
}

/*
 * Determine whether the current line pushes an argument.
 */
ispusharg(argc, argv)
        int argc;
        char *argv[];
{

        if (argc < 2)
                return (0);
        if (argc == 2 && bcmp(argv[0], "push", 4) == 0)
                return (1);
        if (bcmp(argv[argc - 1], "-(sp)", 6) == 0)
                return (1);
        return (0);
}

/*
 * Determine which (if any) registers are modified
 * Return register number that is modified, -1 if none are modified.
 */
modifies(argc, argv)
        int argc;
        char *argv[];
{
        register char *lastarg = argv[argc - 1];

        /*
         * For the VAX or TAHOE all we care about are r0 to r5
         */
        if (lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
                return (lastarg[1] - '0');
        return (-1);
}

/*
 * Rewrite the instruction in (argc, argv) to store its
 * contents into arg instead of onto the stack. The new
 * instruction is placed in the buffer that is provided.
 */
rewrite(instbuf, argc, argv, target)
        char *instbuf;
        int argc;
        char *argv[];
        int target;
{

        switch (argc) {
        case 0:
                instbuf[0] = '\0';
                fprintf(stderr, "blank line to rewrite?\n");
                return;
        case 1:
                sprintf(instbuf, "\t%s\n", argv[0]);
                fprintf(stderr, "rewrite?-> %s", instbuf);
                return;
        case 2:
                if (bcmp(argv[0], "push", 4) == 0) {
                        sprintf(instbuf, "\tmov%s\t%s,r%d\n",
                                &argv[0][4], argv[1], target);
                        return;
                }
                sprintf(instbuf, "\t%s\tr%d\n", argv[0], target);
                return;
        case 3:
                sprintf(instbuf, "\t%s\t%s,r%d\n", argv[0], argv[1], target);
                return;
        case 4:
                sprintf(instbuf, "\t%s\t%s,%s,r%d\n",
                        argv[0], argv[1], argv[2], target);
                return;
        case 5:
                sprintf(instbuf, "\t%s\t%s,%s,%s,r%d\n",
                        argv[0], argv[1], argv[2], argv[3], target);
                return;
        default:
                sprintf(instbuf, "\t%s\t%s", argv[0], argv[1]);
                argc -= 2, argv += 2;
                while (argc-- > 0) {
                        strcat(instbuf, ",");
                        strcat(instbuf, *argv++);
                }
                strcat(instbuf, "\n");
                fprintf(stderr, "rewrite?-> %s", instbuf);
                return;
        }
}

/*
 * Do any necessary post expansion cleanup.
 */
cleanup(numargs)
        int numargs;
{

        return;
}
#endif

#if defined(mc68000)
/*
 * Instruction stop table.
 * All instructions that implicitly modify any of the temporary
 * registers, change control flow, or implicitly loop must be
 * listed in this table. It is used to find the end of a basic
 * block when scanning backwards through the instruction stream
 * trying to merge the inline expansion.
 */
struct inststoptbl inststoptable[] = {
        { "" }
};

/*
 * Check to see if a line is a candidate for replacement.
 * Return pointer to name to be looked up in pattern table.
 */
char *
doreplaceon(cp)
        char *cp;
{

        if (bcmp(cp, "jbsr\t", 5) == 0)
                return (cp + 5);
        return (0);
}

/*
 * Find the next argument to the function being expanded.
 */
nextarg(argc, argv)
        int argc;
        char *argv[];
{
        register char *lastarg = argv[2];

        if (argc == 3 &&
            bcmp(argv[0], "movl", 5) == 0 &&
            bcmp(argv[1], "sp@+", 5) == 0 &&
            (lastarg[1] == '0' || lastarg[1] == '1') &&
            lastarg[2] == '\0') {
                if (lastarg[0] == 'd')
                        return (lastarg[1] - '0');
                return (lastarg[1] - '0' + 8);
        }
        return (-1);
}

/*
 * Determine whether the current line pushes an argument.
 */
 ispusharg(argc, argv)
        int argc;
        char *argv[];
{

        if (argc < 2)
                return (0);
        if (argc == 2 && bcmp(argv[0], "pea", 4) == 0)
                return (1);
        if (bcmp(argv[argc - 1], "sp@-", 5) == 0)
                return (1);
        return (0);
}

/*
 * Determine which (if any) registers are modified
 * Return register number that is modified, -1 if none are modified.
 */
modifies(argc, argv)
        int argc;
        char *argv[];
{
        /*
         * For the MC68000 all we care about are d0, d1, a0, and a1.
         */
        register char *lastarg = argv[argc - 1];

        if (lastarg[0] == 'd' && isdigit(lastarg[1]) && lastarg[2] == '\0')
                return (lastarg[1] - '0');
        if (lastarg[0] == 'a' && isdigit(lastarg[1]) && lastarg[2] == '\0')
                return (lastarg[1] - '0' + 8);
        return (-1);
}

/*
 * Rewrite the instruction in (argc, argv) to store its
 * contents into arg instead of onto the stack. The new
 * instruction is placed in the buffer that is provided.
 */
rewrite(instbuf, argc, argv, target)
        char *instbuf;
        int argc;
        char *argv[];
        int target;
{
        int regno;
        char regtype;

        if (target < 8) {
                regtype = 'd';
                regno = target;
        } else {
                regtype = 'a';
                regno = target - 8;
        }
        switch (argc) {
        case 0:
                instbuf[0] = '\0';
                fprintf(stderr, "blank line to rewrite?\n");
                return;
        case 1:
                sprintf(instbuf, "\t%s\n", argv[0]);
                fprintf(stderr, "rewrite?-> %s", instbuf);
                return;
        case 2:
                if (bcmp(argv[0], "pea", 4) == 0) {
                        if (regtype == 'a') {
                                sprintf(instbuf, "\tlea\t%s,%c%d\n",
                                        argv[1], regtype, regno);
                                return;
                        }
                        if (argv[1][0] == '_' || isdigit(argv[1][0])) {
                                sprintf(instbuf, "\tmovl\t#%s,%c%d\n",
                                        argv[1], regtype, regno);
                                return;
                        }
                        sprintf(instbuf,
                                "\texg\ta0,d%d\n\tlea\t%s,a0\n\texg\ta0,d%d\n",
                                regno, argv[1], regno);
                        return;
                }
                sprintf(instbuf, "\t%s\t%c%d\n", argv[0], regtype, regno);
                return;
        case 3:
                sprintf(instbuf, "\t%s\t%s,%c%d\n",
                        argv[0], argv[1], regtype, regno);
                return;
        default:
                sprintf(instbuf, "\t%s\t%s", argv[0], argv[1]);
                argc -= 2, argv += 2;
                while (argc-- > 0) {
                        strcat(instbuf, ",");
                        strcat(instbuf, *argv++);
                }
                strcat(instbuf, "\n");
                fprintf(stderr, "rewrite?-> %s", instbuf);
                return;
        }
}

/*
 * Do any necessary post expansion cleanup.
 */
cleanup(numargs)
        int numargs;
{

        if (numargs == 0)
                return;
        /*
         * delete instruction to pop arguments.
         * TODO:
         *      CHECK FOR LABEL
         *      CHECK THAT INSTRUCTION IS A POP
         */
        fgets(line[bufhead], MAXLINELEN, stdin);
}
#endif