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Annotation of src/usr.bin/gprof/i386.c, Revision 1.10

1.10    ! deraadt     1: /*     $OpenBSD: i386.c,v 1.9 2006/03/25 19:06:36 espie 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:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     19:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     20:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     21:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     22:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     23:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     24:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     25:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     26:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     27:  */
1.1       deraadt    28:
                     29: #include "gprof.h"
                     30:
1.7       art        31: #define        iscall(off)     ((*(u_char *)&textspace[off]) == 0xE8)
1.3       tholo      32:
1.4       mickey     33: void
1.9       espie      34: findcall(nltype *parentp, unsigned long p_lowpc, unsigned long p_highpc)
1.1       deraadt    35: {
1.7       art        36:        unsigned long pc;
1.3       tholo      37:        long len;
                     38:        nltype *childp;
                     39:        unsigned long destpc;
1.7       art        40:        int off;
1.3       tholo      41:
                     42:        if (textspace == 0)
                     43:                return;
                     44:        if (p_lowpc < s_lowpc)
                     45:                p_lowpc = s_lowpc;
                     46:        if (p_highpc > s_highpc)
                     47:                p_highpc = s_highpc;
                     48: #      ifdef DEBUG
                     49:                if ( debug & CALLDEBUG ) {
                     50:                        printf( "[findcall] %s: 0x%x to 0x%x\n" ,
                     51:                                parentp -> name , p_lowpc , p_highpc );
                     52:                }
1.5       danh       53: #      endif /* DEBUG */
1.7       art        54:        for (pc = p_lowpc; pc < p_highpc; pc += len) {
                     55:                off = pc - s_lowpc;
1.3       tholo      56:                len = 1;
1.7       art        57:                if (iscall(off)) {
1.9       espie      58:                        destpc = *(unsigned long *)&textspace[off + 1] + off + 5;
1.3       tholo      59: #                      ifdef DEBUG
                     60:                                if ( debug & CALLDEBUG ) {
                     61:                                        printf( "[findcall]\t0x%x:calls" , pc - textspace );
                     62:                                        printf( "\tdestpc 0x%x" , destpc );
                     63:                                }
1.5       danh       64: #                      endif /* DEBUG */
1.3       tholo      65:                        if (destpc >= s_lowpc && destpc <= s_highpc) {
                     66:                                childp = nllookup(destpc);
                     67: #                              ifdef DEBUG
                     68:                                        if ( debug & CALLDEBUG ) {
                     69:                                                printf( " childp->name %s" , childp -> name );
                     70:                                                printf( " childp->value 0x%x\n" ,
                     71:                                                        childp -> value );
                     72:                                        }
1.5       danh       73: #                              endif /* DEBUG */
1.3       tholo      74:                                if (childp != NULL && childp->value == destpc) {
                     75:                                        addarc(parentp, childp, 0L);
                     76:                                        len += 4;
                     77:                                        continue;
                     78:                                }
                     79:                        }
                     80: #                      ifdef DEBUG
                     81:                                if ( debug & CALLDEBUG ) {
                     82:                                        printf( "\tbut it's a botch\n" );
                     83:                                }
1.5       danh       84: #                      endif /* DEBUG */
1.3       tholo      85:                }
                     86:        }
1.1       deraadt    87: }