1 /* 2 * Copyright (c) 1983, 1993, 2001 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include "gprof.h" 30 #include "search_list.h" 31 #include "source.h" 32 #include "symtab.h" 33 #include "cg_arcs.h" 34 #include "corefile.h" 35 #include "hist.h" 36 37 static int i386_iscall (unsigned char *); 38 void i386_find_call (Sym *, bfd_vma, bfd_vma); 39 40 static int 41 i386_iscall (unsigned char *ip) 42 { 43 if (*ip == 0xe8) 44 return 1; 45 return 0; 46 } 47 48 49 void 50 i386_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc) 51 { 52 unsigned char *instructp; 53 Sym *child; 54 bfd_vma pc, destpc; 55 56 if (core_text_space == 0) 57 { 58 return; 59 } 60 if (p_lowpc < s_lowpc) 61 { 62 p_lowpc = s_lowpc; 63 } 64 if (p_highpc > s_highpc) 65 { 66 p_highpc = s_highpc; 67 } 68 DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n", 69 parent->name, (unsigned long) p_lowpc, 70 (unsigned long) p_highpc)); 71 72 for (pc = p_lowpc; pc < p_highpc; ++pc) 73 { 74 instructp = (unsigned char *) core_text_space + pc - core_text_sect->vma; 75 if (i386_iscall (instructp)) 76 { 77 DBG (CALLDEBUG, 78 printf ("[findcall]\t0x%lx:call", (unsigned long) pc)); 79 /* 80 * regular pc relative addressing 81 * check that this is the address of 82 * a function. 83 */ 84 85 destpc = bfd_get_32 (core_bfd, instructp + 1) + pc + 5; 86 if (destpc >= s_lowpc && destpc <= s_highpc) 87 { 88 child = sym_lookup (&symtab, destpc); 89 if (child && child->addr == destpc) 90 { 91 /* 92 * a hit 93 */ 94 DBG (CALLDEBUG, 95 printf ("\tdestpc 0x%lx (%s)\n", 96 (unsigned long) destpc, child->name)); 97 arc_add (parent, child, (unsigned long) 0); 98 instructp += 4; /* call is a 5 byte instruction */ 99 continue; 100 } 101 } 102 /* 103 * else: 104 * it looked like a callf, but it: 105 * a) wasn't actually a callf, or 106 * b) didn't point to a known function in the symtab, or 107 * c) something funny is going on. 108 */ 109 DBG (CALLDEBUG, printf ("\tbut it's a botch\n")); 110 } 111 } 112 } 113