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Annotation of 43BSDTahoe/lib/libc/vax/csu/mon.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 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: #if defined(LIBC_SCCS) && !defined(lint)
        !             8: static char sccsid[] = "@(#)mon.c      5.3 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: #define ARCDENSITY     5       /* density of routines */
        !            12: #define MINARCS                50      /* minimum number of counters */
        !            13: #define        HISTFRACTION    2       /* fraction of text space for histograms */
        !            14: 
        !            15: 
        !            16: struct phdr {
        !            17:        int *lpc;
        !            18:        int *hpc;
        !            19:        int ncnt;
        !            20: };
        !            21: 
        !            22: struct cnt {
        !            23:        int *pc;
        !            24:        long ncall;
        !            25: } *countbase;
        !            26: 
        !            27: static int cntrs = 0;
        !            28: static int profiling = 3;
        !            29: static char *s_sbuf;
        !            30: static int s_bufsiz;
        !            31: static int s_scale;
        !            32: static char *s_lowpc;
        !            33: 
        !            34: int numctrs;
        !            35: 
        !            36: #define        MSG "No space for monitor buffer(s)\n"
        !            37: 
        !            38: monstartup(lowpc, highpc)
        !            39:        char *lowpc;
        !            40:        char *highpc;
        !            41: {
        !            42:        int monsize;
        !            43:        char *buffer;
        !            44:        int cntsiz;
        !            45:        extern char *sbrk();
        !            46:        extern char *minbrk;
        !            47: 
        !            48: 
        !            49:        cntsiz = (highpc - lowpc) * ARCDENSITY / 100;
        !            50:        if (cntsiz < MINARCS)
        !            51:                cntsiz = MINARCS;
        !            52:        monsize = (highpc - lowpc + HISTFRACTION - 1) / HISTFRACTION
        !            53:                + sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !            54:        monsize = (monsize + 1) & ~1;
        !            55:        buffer = sbrk(monsize);
        !            56:        if (buffer == (char *)-1) {
        !            57:                write(2, MSG, sizeof(MSG));
        !            58:                return;
        !            59:        }
        !            60:        minbrk = sbrk(0);
        !            61:        monitor(lowpc, highpc, buffer, monsize, cntsiz);
        !            62: }
        !            63: 
        !            64: /*
        !            65:  *     This routine is massaged so that it may be jsb'ed to
        !            66:  */
        !            67: asm(".text");
        !            68: asm("#the beginning of mcount()");
        !            69: asm(".data");
        !            70: mcount()
        !            71: {
        !            72:        register int *selfpc;   /* r11 */
        !            73:        register long **cntp;   /* r10 */
        !            74: 
        !            75:        /*
        !            76:         * find the return address for mcount,
        !            77:         * and address of counter pointer
        !            78:         */
        !            79:        asm("   movl    (sp),r11");     /* selfpc = ... (jsb frame) */
        !            80:        asm("   movl    r0,r10");       /* address of count local */
        !            81:        /*
        !            82:         * check that we aren't recursively invoked.
        !            83:         */
        !            84:        if (profiling)
        !            85:                goto out;
        !            86:        profiling++;
        !            87:        /*
        !            88:         * check that counter is allocated
        !            89:         */
        !            90:        if (*cntp == 0) {
        !            91:                /*
        !            92:                 * check that a counter is available
        !            93:                 */
        !            94:                if (cntrs++ == numctrs)
        !            95:                        goto overflow;
        !            96:                countbase->pc = selfpc;
        !            97:                *cntp = &countbase->ncall;
        !            98:                countbase++;
        !            99:        }
        !           100:        (**cntp)++;
        !           101:        profiling--;
        !           102: out:
        !           103:        asm( "  rsb" );
        !           104: 
        !           105: overflow:
        !           106: #   define     TOLIMIT "mcount: counter overflow\n"
        !           107:        write( 2 , TOLIMIT , sizeof( TOLIMIT ) );
        !           108:        goto out;
        !           109: }
        !           110: asm(".text");
        !           111: asm("#the end of mcount()");
        !           112: asm(".data");
        !           113: 
        !           114: monitor(lowpc, highpc, buf, bufsiz, cntsiz)
        !           115:        char *lowpc, *highpc;
        !           116:        char *buf;
        !           117:        int bufsiz, cntsiz;
        !           118: {
        !           119:        register int o;
        !           120:        struct phdr *php;
        !           121:        static int ssiz;
        !           122:        static char *sbuf;
        !           123: 
        !           124:        if (lowpc == 0) {
        !           125:                moncontrol(0);
        !           126:                o = creat("mon.out", 0666);
        !           127:                write(o, sbuf, ssiz);
        !           128:                close(o);
        !           129:                return;
        !           130:        }
        !           131:        sbuf = buf;
        !           132:        ssiz = bufsiz;
        !           133:        php = (struct phdr *)&buf[0];
        !           134:        php->lpc = (int *)lowpc;
        !           135:        php->hpc = (int *)highpc;
        !           136:        php->ncnt = cntsiz;
        !           137:        numctrs = cntsiz;
        !           138:        countbase = (struct cnt *)(buf + sizeof(struct phdr));
        !           139:        o = sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !           140:        buf += o;
        !           141:        bufsiz -= o;
        !           142:        if (bufsiz <= 0)
        !           143:                return;
        !           144:        o = (highpc - lowpc);
        !           145:        if(bufsiz < o)
        !           146:                o = ((float) bufsiz / o) * 65536;
        !           147:        else
        !           148:                o = 65536;
        !           149:        s_scale = o;
        !           150:        s_sbuf = buf;
        !           151:        s_bufsiz = bufsiz;
        !           152:        s_lowpc = lowpc;
        !           153:        moncontrol(1);
        !           154: }
        !           155: 
        !           156: /*
        !           157:  * Control profiling
        !           158:  *     profiling is what mcount checks to see if
        !           159:  *     all the data structures are ready.
        !           160:  */
        !           161: moncontrol(mode)
        !           162:     int mode;
        !           163: {
        !           164:     if (mode) {
        !           165:        /* start */
        !           166:        profil(s_sbuf, s_bufsiz, s_lowpc, s_scale);
        !           167:        profiling = 0;
        !           168:     } else {
        !           169:        /* stop */
        !           170:        profil((char *)0, 0, 0, 0);
        !           171:        profiling = 3;
        !           172:     }
        !           173: }

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