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Annotation of 42BSD/lib/libc/vax/csu/mon.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)mon.c       4.9 (Berkeley) 7/26/83";
        !             2: 
        !             3: #define ARCDENSITY     5       /* density of routines */
        !             4: #define MINARCS                50      /* minimum number of counters */
        !             5: #define        HISTFRACTION    2       /* fraction of text space for histograms */
        !             6: 
        !             7: 
        !             8: struct phdr {
        !             9:        int *lpc;
        !            10:        int *hpc;
        !            11:        int ncnt;
        !            12: };
        !            13: 
        !            14: struct cnt {
        !            15:        int *pc;
        !            16:        long ncall;
        !            17: } *countbase;
        !            18: 
        !            19: static int cntrs = 0;
        !            20: static int profiling = 3;
        !            21: static char *s_sbuf;
        !            22: static int s_bufsiz;
        !            23: static int s_scale;
        !            24: static char *s_lowpc;
        !            25: 
        !            26: int numctrs;
        !            27: 
        !            28: #define        MSG "No space for monitor buffer(s)\n"
        !            29: 
        !            30: monstartup(lowpc, highpc)
        !            31:        char *lowpc;
        !            32:        char *highpc;
        !            33: {
        !            34:        int monsize;
        !            35:        char *buffer;
        !            36:        int cntsiz;
        !            37:        extern char *sbrk();
        !            38:        extern char *minbrk;
        !            39: 
        !            40: 
        !            41:        cntsiz = (highpc - lowpc) * ARCDENSITY / 100;
        !            42:        if (cntsiz < MINARCS)
        !            43:                cntsiz = MINARCS;
        !            44:        monsize = (highpc - lowpc + HISTFRACTION - 1) / HISTFRACTION
        !            45:                + sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !            46:        monsize = (monsize + 1) & ~1;
        !            47:        buffer = sbrk(monsize);
        !            48:        if (buffer == (char *)-1) {
        !            49:                write(2, MSG, sizeof(MSG));
        !            50:                return;
        !            51:        }
        !            52:        minbrk = sbrk(0);
        !            53:        monitor(lowpc, highpc, buffer, monsize, cntsiz);
        !            54: }
        !            55: 
        !            56: /*
        !            57:  *     This routine is massaged so that it may be jsb'ed to
        !            58:  */
        !            59: asm(".text");
        !            60: asm("#the beginning of mcount()");
        !            61: asm(".data");
        !            62: mcount()
        !            63: {
        !            64:        register int *selfpc;   /* r11 */
        !            65:        register long **cntp;   /* r10 */
        !            66: 
        !            67: #ifdef lint
        !            68:        selfpc = (int *) 0;
        !            69: #else not lint
        !            70:        /*
        !            71:         * find the return address for mcount,
        !            72:         * and address of counter pointer
        !            73:         */
        !            74:        asm("   movl    (sp),r11");     /* selfpc = ... (jsb frame) */
        !            75:        asm("   movl    r0,r10");       /* address of count local */
        !            76: #endif not lint
        !            77:        /*
        !            78:         * check that we aren't recursively invoked.
        !            79:         */
        !            80:        if (profiling)
        !            81:                goto out;
        !            82:        profiling++;
        !            83:        /*
        !            84:         * check that counter is allocated
        !            85:         */
        !            86:        if (*cntp == 0) {
        !            87:                /*
        !            88:                 * check that a counter is available
        !            89:                 */
        !            90:                if (cntrs++ == numctrs)
        !            91:                        goto overflow;
        !            92:                countbase->pc = selfpc;
        !            93:                *cntp = &countbase->ncall;
        !            94:                countbase++;
        !            95:        }
        !            96:        (**cntp)++;
        !            97:        profiling--;
        !            98: out:
        !            99:        asm( "  rsb" );
        !           100: 
        !           101: overflow:
        !           102: #   define     TOLIMIT "mcount: counter overflow\n"
        !           103:        write( 2 , TOLIMIT , sizeof( TOLIMIT ) );
        !           104:        goto out;
        !           105: }
        !           106: asm(".text");
        !           107: asm("#the end of mcount()");
        !           108: asm(".data");
        !           109: 
        !           110: monitor(lowpc, highpc, buf, bufsiz, cntsiz)
        !           111:        char *lowpc, *highpc;
        !           112:        char *buf;
        !           113:        int bufsiz, cntsiz;
        !           114: {
        !           115:        register int o;
        !           116:        struct phdr *php;
        !           117:        static int ssiz;
        !           118:        static char *sbuf;
        !           119: 
        !           120:        if (lowpc == 0) {
        !           121:                moncontrol(0);
        !           122:                o = creat("mon.out", 0666);
        !           123:                write(o, sbuf, ssiz);
        !           124:                close(o);
        !           125:                return;
        !           126:        }
        !           127:        sbuf = buf;
        !           128:        ssiz = bufsiz;
        !           129:        php = (struct phdr *)&buf[0];
        !           130:        php->lpc = (int *)lowpc;
        !           131:        php->hpc = (int *)highpc;
        !           132:        php->ncnt = cntsiz;
        !           133:        numctrs = cntsiz;
        !           134:        countbase = (struct cnt *)(buf + sizeof(struct phdr));
        !           135:        o = sizeof(struct phdr) + cntsiz * sizeof(struct cnt);
        !           136:        buf += o;
        !           137:        bufsiz -= o;
        !           138:        if (bufsiz <= 0)
        !           139:                return;
        !           140:        o = (highpc - lowpc);
        !           141:        if(bufsiz < o)
        !           142:                o = ((float) bufsiz / o) * 65536;
        !           143:        else
        !           144:                o = 65536;
        !           145:        s_scale = o;
        !           146:        s_sbuf = buf;
        !           147:        s_bufsiz = bufsiz;
        !           148:        s_lowpc = lowpc;
        !           149:        moncontrol(1);
        !           150: }
        !           151: 
        !           152: /*
        !           153:  * Control profiling
        !           154:  *     profiling is what mcount checks to see if
        !           155:  *     all the data structures are ready.
        !           156:  */
        !           157: moncontrol(mode)
        !           158:     int mode;
        !           159: {
        !           160:     if (mode) {
        !           161:        /* start */
        !           162:        profil(s_sbuf, s_bufsiz, s_lowpc, s_scale);
        !           163:        profiling = 0;
        !           164:     } else {
        !           165:        /* stop */
        !           166:        profil((char *)0, 0, 0, 0);
        !           167:        profiling = 3;
        !           168:     }
        !           169: }

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