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Annotation of src/usr.bin/gprof/i386.c, Revision 1.7

1.7     ! art         1: /*     $OpenBSD: i386.c,v 1.6 2002/04/20 03:37:40 tholo Exp $  */
1.1       deraadt     2: /*     $NetBSD: i386.c,v 1.5 1995/04/19 07:16:04 cgd Exp $     */
                      3:
1.6       tholo       4: /*-
                      5:  * Copyright (c) 1996 SigmaSoft, Th. Lockert
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. The name of the author may not be used to endorse or promote products
                     17:  *    derived from this software without specific prior written permission
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     22:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     23:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     24:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     25:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     26:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     27:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     28:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     29:  */
                     30:
1.1       deraadt    31: #ifndef lint
1.7     ! art        32: static char rcsid[] = "$OpenBSD: i386.c,v 1.6 2002/04/20 03:37:40 tholo Exp $";
1.1       deraadt    33: #endif /* not lint */
                     34:
                     35: #include "gprof.h"
                     36:
1.7     ! art        37: #define        iscall(off)     ((*(u_char *)&textspace[off]) == 0xE8)
1.3       tholo      38:
1.4       mickey     39: void
1.1       deraadt    40: findcall( parentp , p_lowpc , p_highpc )
                     41:     nltype             *parentp;
                     42:     unsigned long      p_lowpc;
                     43:     unsigned long      p_highpc;
                     44: {
1.7     ! art        45:        unsigned long pc;
1.3       tholo      46:        long len;
                     47:        nltype *childp;
                     48:        unsigned long destpc;
1.7     ! art        49:        int off;
1.3       tholo      50:
                     51:        if (textspace == 0)
                     52:                return;
                     53:        if (p_lowpc < s_lowpc)
                     54:                p_lowpc = s_lowpc;
                     55:        if (p_highpc > s_highpc)
                     56:                p_highpc = s_highpc;
                     57: #      ifdef DEBUG
                     58:                if ( debug & CALLDEBUG ) {
                     59:                        printf( "[findcall] %s: 0x%x to 0x%x\n" ,
                     60:                                parentp -> name , p_lowpc , p_highpc );
                     61:                }
1.5       danh       62: #      endif /* DEBUG */
1.7     ! art        63:        for (pc = p_lowpc; pc < p_highpc; pc += len) {
        !            64:                off = pc - s_lowpc;
1.3       tholo      65:                len = 1;
1.7     ! art        66:                if (iscall(off)) {
        !            67:                        destpc = *(u_long *)&textspace[off + 1] + off + 5;
1.3       tholo      68: #                      ifdef DEBUG
                     69:                                if ( debug & CALLDEBUG ) {
                     70:                                        printf( "[findcall]\t0x%x:calls" , pc - textspace );
                     71:                                        printf( "\tdestpc 0x%x" , destpc );
                     72:                                }
1.5       danh       73: #                      endif /* DEBUG */
1.3       tholo      74:                        if (destpc >= s_lowpc && destpc <= s_highpc) {
                     75:                                childp = nllookup(destpc);
                     76: #                              ifdef DEBUG
                     77:                                        if ( debug & CALLDEBUG ) {
                     78:                                                printf( " childp->name %s" , childp -> name );
                     79:                                                printf( " childp->value 0x%x\n" ,
                     80:                                                        childp -> value );
                     81:                                        }
1.5       danh       82: #                              endif /* DEBUG */
1.3       tholo      83:                                if (childp != NULL && childp->value == destpc) {
                     84:                                        addarc(parentp, childp, 0L);
                     85:                                        len += 4;
                     86:                                        continue;
                     87:                                }
                     88:                        }
                     89: #                      ifdef DEBUG
                     90:                                if ( debug & CALLDEBUG ) {
                     91:                                        printf( "\tbut it's a botch\n" );
                     92:                                }
1.5       danh       93: #                      endif /* DEBUG */
1.3       tholo      94:                }
                     95:        }
1.1       deraadt    96: }