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Annotation of 43BSDReno/sys/tahoe/inline/machdep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1984 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)machdep.c  1.3 (Berkeley) 2/24/86";
        !             9: #endif
        !            10: 
        !            11: #include <stdio.h>
        !            12: #include <ctype.h>
        !            13: #include "inline.h"
        !            14: 
        !            15: extern char *strcpy();
        !            16: extern char *strcat();
        !            17: extern char *index();
        !            18: 
        !            19: /*
        !            20:  * The routines and tables in this file must be rewritten
        !            21:  * for each new machine that this program is ported to.
        !            22:  */
        !            23: 
        !            24: /*
        !            25:  * Instruction stop table.
        !            26:  * All instructions that implicitly modify any of the temporary
        !            27:  * registers, change control flow, or implicitly loop must be
        !            28:  * listed in this table. It is used to find the end of a basic
        !            29:  * block when scanning backwards through the instruction stream
        !            30:  * trying to merge the inline expansion.
        !            31:  */
        !            32: struct inststoptbl inststoptable[] = {
        !            33: /* control */
        !            34:        { "bbssi" }, { "bcc" }, { "bcs" }, { "beql" }, { "beqlu" },
        !            35:        { "bgeq" }, { "bgequ" }, { "bgtr" }, { "bgtru" }, { "bleq" },
        !            36:        { "blequ" }, { "blss" }, { "blssu" }, { "bneq" }, { "bnequ" },
        !            37:        { "brb" }, { "brw" }, { "bvc" }, { "bvs" }, { "jmp" },
        !            38: /* jump versions of control */
        !            39:        { "jbc" }, { "jbs" }, { "jeql" }, { "jeqlu" },
        !            40:        { "jgeq" }, { "jgequ" }, { "jgtr" }, { "jgtru" }, { "jleq" },
        !            41:        { "jlequ" }, { "jlss" }, { "jlssu" }, { "jneq" }, { "jnequ" },
        !            42:        { "jcc" }, { "jcs" }, { "jvc" }, { "jvs" }, { "jbr" },
        !            43: /* multiple registers */
        !            44:        { "loadr" },
        !            45: /* bit field */
        !            46:        { "bbc" }, { "bbs" },
        !            47: /* character string and block move */
        !            48:        { "cmps2" }, { "cmps3" }, { "movblk" }, { "movs2" }, { "movs3" },
        !            49: /* procedure call */
        !            50:        { "callf" }, { "calls" }, { "ret" },
        !            51: /* loop control */
        !            52:        { "aobleq" }, { "aoblss" }, { "casel" },
        !            53: /* privileged and miscellaneous */
        !            54:        { "bpt" }, { "halt" }, { "kcall" }, { "ldpctx" }, { "rei" },
        !            55:        { "svpctx" },
        !            56:        { "" }
        !            57: };
        !            58: 
        !            59: /*
        !            60:  * Check to see if a line is a candidate for replacement.
        !            61:  * Return pointer to name to be looked up in pattern table.
        !            62:  */
        !            63: char *
        !            64: doreplaceon(cp)
        !            65:        char *cp;
        !            66: {
        !            67: 
        !            68:        if (bcmp(cp, "callf\t", 6))
        !            69:                return (0);
        !            70:        if ((cp = index(cp + 6, ',')) == 0)
        !            71:                return (0);
        !            72:        return (++cp);
        !            73: }
        !            74: 
        !            75: /*
        !            76:  * Find out how many arguments the function is being called with.
        !            77:  * A return value of -1 indicates that the count can't be determined.
        !            78:  */
        !            79: countargs(cp)
        !            80:        char *cp;
        !            81: {
        !            82:        int i;
        !            83: 
        !            84:        if ((cp = index(cp, '$')) == 0)
        !            85:                return (-1);
        !            86:        if (!isdigit(*++cp) || (i = atoi(cp)) == -1)
        !            87:                return (-1);
        !            88:        return (i/4 - 1);
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Find the next argument to the function being expanded.
        !            93:  */
        !            94: nextarg(argc, argv)
        !            95:        int argc;
        !            96:        char *argv[];
        !            97: {
        !            98:        register char *lastarg = argv[2];
        !            99: 
        !           100:        if (argc == 3 &&
        !           101:            bcmp(argv[0], "mov", 3) == 0 &&
        !           102:            bcmp(argv[1], "(sp)+", 6) == 0 &&
        !           103:            lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           104:                return (lastarg[1] - '0');
        !           105:        return (-1);
        !           106: }
        !           107: 
        !           108: /*
        !           109:  * Determine whether the current line pushes an argument.
        !           110:  */
        !           111: ispusharg(argc, argv)
        !           112:        int argc;
        !           113:        char *argv[];
        !           114: {
        !           115: 
        !           116:        if (argc < 2)
        !           117:                return (0);
        !           118:        if (argc == 2 && bcmp(argv[0], "push", 4) == 0)
        !           119:                return (1);
        !           120:        if (bcmp(argv[argc - 1], "-(sp)", 6) == 0)
        !           121:                return (1);
        !           122:        return (0);
        !           123: }
        !           124: 
        !           125: /*
        !           126:  * Determine which (if any) registers are modified
        !           127:  * Return register number that is modified, -1 if none are modified.
        !           128:  */
        !           129: modifies(argc, argv)
        !           130:        int argc;
        !           131:        char *argv[];
        !           132: {
        !           133:        register char *lastarg = argv[argc - 1];
        !           134: 
        !           135:        /*
        !           136:         * For the tahoe all we care about are r0 to r5
        !           137:         */
        !           138:        if (lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           139:                return (lastarg[1] - '0');
        !           140:        return (-1);
        !           141: }
        !           142: 
        !           143: /*
        !           144:  * Rewrite the instruction in (argc, argv) to store its
        !           145:  * contents into arg instead of onto the stack. The new
        !           146:  * instruction is placed in the buffer that is provided.
        !           147:  */
        !           148: rewrite(instbuf, argc, argv, target)
        !           149:        char *instbuf;
        !           150:        int argc;
        !           151:        char *argv[];
        !           152:        int target;
        !           153: {
        !           154: 
        !           155:        switch (argc) {
        !           156:        case 0:
        !           157:                instbuf[0] = '\0';
        !           158:                fprintf(stderr, "blank line to rewrite?\n");
        !           159:                return;
        !           160:        case 1:
        !           161:                sprintf(instbuf, "\t%s\n", argv[0]);
        !           162:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           163:                return;
        !           164:        case 2:
        !           165:                if (bcmp(argv[0], "push", 4) == 0) {
        !           166:                        sprintf(instbuf, "\tmov%s\t%s,r%d\n",
        !           167:                                &argv[0][4], argv[1], target);
        !           168:                        return;
        !           169:                }
        !           170:                sprintf(instbuf, "\t%s\tr%d\n", argv[0], target);
        !           171:                return;
        !           172:        case 3:
        !           173:                sprintf(instbuf, "\t%s\t%s,r%d\n", argv[0], argv[1], target);
        !           174:                return;
        !           175:        case 4:
        !           176:                sprintf(instbuf, "\t%s\t%s,%s,r%d\n",
        !           177:                        argv[0], argv[1], argv[2], target);
        !           178:                return;
        !           179:        case 5:
        !           180:                sprintf(instbuf, "\t%s\t%s,%s,%s,r%d\n",
        !           181:                        argv[0], argv[1], argv[2], argv[3], target);
        !           182:                return;
        !           183:        default:
        !           184:                sprintf(instbuf, "\t%s\t%s", argv[0], argv[1]);
        !           185:                argc -= 2, argv += 2;
        !           186:                while (argc-- > 0) {
        !           187:                        strcat(instbuf, ",");
        !           188:                        strcat(instbuf, *argv++);
        !           189:                }
        !           190:                strcat(instbuf, "\n");
        !           191:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           192:                return;
        !           193:        }
        !           194: }
        !           195: 
        !           196: /*
        !           197:  * Do any necessary post expansion cleanup.
        !           198:  */
        !           199: cleanup(numargs)
        !           200:        int numargs;
        !           201: {
        !           202: 
        !           203: }

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