gprof/i386.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that: (1) source distributions retain this entire copyright
   7  * notice and comment, and (2) distributions including binaries display
   8  * the following acknowledgement:  ``This product includes software
   9  * developed by the University of California, Berkeley and its contributors''
  10  * in the documentation or other materials provided with the distribution
  11  * and in all advertising materials mentioning features or use of this
  12  * software. Neither the name of the University nor the names of its
  13  * contributors may be used to endorse or promote products derived
  14  * from this software without specific prior written permission.
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  */
  19 #include "gprof.h"
  20 #include "cg_arcs.h"
  21 #include "core.h"
  22 #include "hist.h"
  23 #include "symtab.h"
  24
  25
  26 int
  27 DEFUN(iscall, (ip), unsigned char *ip)
  28 {
  29   if (*ip == 0xeb || *ip == 0x9a)
  30     return 1;
  31   return 0;
  32 }
  33
  34
  35 void
  36 find_call(parent, p_lowpc, p_highpc)
  37     Sym *parent;
  38     bfd_vma p_lowpc;
  39     bfd_vma p_highpc;
  40 {
  41     unsigned char *instructp;
  42     long length;
  43     Sym *child;
  44     bfd_vma destpc;
  45
  46     if (core_text_space == 0) {
  47         return;
  48     }
  49     if (p_lowpc < s_lowpc) {
  50         p_lowpc = s_lowpc;
  51     }
  52     if (p_highpc > s_highpc) {
  53         p_highpc = s_highpc;
  54     }
  55     DBG(CALLDEBUG, printf("[findcall] %s: 0x%lx to 0x%lx\n",
  56                           parent->name, p_lowpc, p_highpc));
  57     for (  instructp = (unsigned char*) core_text_space + p_lowpc ;
  58             instructp < (unsigned char*) core_text_space + p_highpc ;
  59             instructp += length) {
  60         length = 1;
  61         if (iscall (instructp)) {
  62             DBG(CALLDEBUG,
  63                 printf("[findcall]\t0x%x:callf",
  64                        instructp - (unsigned char*) core_text_space));
  65           length = 4;
  66           /*
  67            *    regular pc relative addressing
  68            *    check that this is the address of
  69            *    a function.
  70            */
  71           destpc = ((bfd_vma)instructp + 5 - (bfd_vma) core_text_space);
  72           if (destpc >= s_lowpc && destpc <= s_highpc) {
  73             child = sym_lookup(&symtab, destpc);
  74             DBG(CALLDEBUG,
  75                 printf("[findcall]\tdestpc 0x%lx", destpc);
  76                 printf(" child->name %s", child->name);
  77                 printf(" child->addr 0x%lx\n", child->addr);
  78                 );
  79             if (child->addr == destpc) {
  80               /*
  81                *        a hit
  82                */
  83               arc_add(parent, child, (long) 0);
  84               length += 4;      /* constant lengths */
  85               continue;
  86             }
  87             goto botched;
  88           }
  89           /*
  90            *    else:
  91            *    it looked like a callf,
  92            *    but it wasn't to anywhere.
  93            */
  94         botched:
  95           /*
  96            *    something funny going on.
  97            */
  98             DBG(CALLDEBUG, printf("[findcall]\tbut it's a botch\n"));
  99             length = 1;
 100             continue;
 101         }
 102       }
 103   }