337 lines
8.8 KiB
C
337 lines
8.8 KiB
C
/*
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* Copyright (c) 1983, 1993, 2001
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "gprof.h"
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#include "search_list.h"
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#include "source.h"
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#include "symtab.h"
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#include "cg_arcs.h"
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#include "corefile.h"
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#include "hist.h"
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/*
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* opcode of the `callf' instruction
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*/
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#define CALLF 0xfe
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/*
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* register for pc relative addressing
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*/
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#define PC 0xf
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enum tahoe_opermodes
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{
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literal, indexed, reg, regdef, autodec, autoinc, autoincdef,
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bytedisp, bytedispdef, worddisp, worddispdef, longdisp, longdispdef,
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immediate, absolute, byterel, bytereldef, wordrel, wordreldef,
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longrel, longreldef
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};
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typedef enum tahoe_opermodes tahoe_operandenum;
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/*
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* A symbol to be the child of indirect callf:
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*/
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static Sym indirectchild;
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static tahoe_operandenum tahoe_operandmode (unsigned char *);
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static char *tahoe_operandname (tahoe_operandenum);
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static long tahoe_operandlength (unsigned char *);
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static bfd_signed_vma tahoe_offset (unsigned char *);
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void tahoe_find_call (Sym *, bfd_vma, bfd_vma);
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static tahoe_operandenum
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tahoe_operandmode (unsigned char *modep)
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{
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long usesreg = *modep & 0xf;
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switch ((*modep >> 4) & 0xf)
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{
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case 0:
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case 1:
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case 2:
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case 3:
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return literal;
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case 4:
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return indexed;
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case 5:
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return reg;
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case 6:
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return regdef;
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case 7:
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return autodec;
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case 8:
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return usesreg != 0xe ? autoinc : immediate;
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case 9:
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return usesreg != PC ? autoincdef : absolute;
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case 10:
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return usesreg != PC ? bytedisp : byterel;
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case 11:
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return usesreg != PC ? bytedispdef : bytereldef;
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case 12:
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return usesreg != PC ? worddisp : wordrel;
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case 13:
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return usesreg != PC ? worddispdef : wordreldef;
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case 14:
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return usesreg != PC ? longdisp : longrel;
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case 15:
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return usesreg != PC ? longdispdef : longreldef;
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}
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/* NOTREACHED */
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abort ();
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}
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static char *
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tahoe_operandname (tahoe_operandenum mode)
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{
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switch (mode)
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{
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case literal:
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return "literal";
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case indexed:
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return "indexed";
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case reg:
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return "register";
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case regdef:
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return "register deferred";
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case autodec:
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return "autodecrement";
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case autoinc:
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return "autoincrement";
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case autoincdef:
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return "autoincrement deferred";
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case bytedisp:
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return "byte displacement";
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case bytedispdef:
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return "byte displacement deferred";
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case byterel:
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return "byte relative";
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case bytereldef:
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return "byte relative deferred";
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case worddisp:
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return "word displacement";
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case worddispdef:
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return "word displacement deferred";
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case wordrel:
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return "word relative";
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case wordreldef:
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return "word relative deferred";
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case immediate:
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return "immediate";
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case absolute:
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return "absolute";
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case longdisp:
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return "long displacement";
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case longdispdef:
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return "long displacement deferred";
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case longrel:
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return "long relative";
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case longreldef:
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return "long relative deferred";
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}
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/* NOTREACHED */
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abort ();
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}
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static long
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tahoe_operandlength (unsigned char *modep
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)
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{
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switch (tahoe_operandmode (modep))
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{
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case literal:
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case reg:
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case regdef:
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case autodec:
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case autoinc:
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case autoincdef:
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return 1;
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case bytedisp:
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case bytedispdef:
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case byterel:
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case bytereldef:
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return 2;
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case worddisp:
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case worddispdef:
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case wordrel:
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case wordreldef:
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return 3;
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case immediate:
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case absolute:
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case longdisp:
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case longdispdef:
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case longrel:
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case longreldef:
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return 5;
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case indexed:
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return 1 + tahoe_operandlength (modep + 1);
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}
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/* NOTREACHED */
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abort ();
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}
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static bfd_signed_vma
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tahoe_offset (unsigned char *modep)
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{
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tahoe_operandenum mode = tahoe_operandmode (modep);
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++modep; /* skip over the mode */
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switch (mode)
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{
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default:
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fprintf (stderr, "[reladdr] not relative address\n");
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return 0;
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case byterel:
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return 1 + bfd_get_signed_8 (core_bfd, modep);
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case wordrel:
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return 2 + bfd_get_signed_16 (core_bfd, modep);
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case longrel:
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return 4 + bfd_get_signed_32 (core_bfd, modep);
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}
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}
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void
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tahoe_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
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{
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unsigned char *instructp;
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long length;
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Sym *child;
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tahoe_operandenum mode;
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tahoe_operandenum firstmode;
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bfd_vma pc, destpc;
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static bfd_boolean inited = FALSE;
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if (!inited)
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{
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inited = TRUE;
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sym_init (&indirectchild);
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indirectchild.cg.prop.fract = 1.0;
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indirectchild.cg.cyc.head = &indirectchild;
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}
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DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
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parent->name, (unsigned long) p_lowpc,
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(unsigned long) p_highpc));
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for (pc = p_lowpc; pc < p_highpc; pc += length)
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{
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length = 1;
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instructp = ((unsigned char *) core_text_space
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+ pc - core_text_sect->vma);
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if ((*instructp & 0xff) == CALLF)
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{
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/*
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* maybe a callf, better check it out.
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* skip the count of the number of arguments.
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*/
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DBG (CALLDEBUG, printf ("[findcall]\t0x%lx:callf",
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(unsigned long) pc));
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firstmode = tahoe_operandmode (instructp + length);
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switch (firstmode)
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{
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case literal:
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case immediate:
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break;
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default:
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goto botched;
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}
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length += tahoe_operandlength (instructp + length);
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mode = tahoe_operandmode (instructp + length);
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DBG (CALLDEBUG,
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printf ("\tfirst operand is %s", tahoe_operandname (firstmode));
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printf ("\tsecond operand is %s\n", tahoe_operandname (mode));
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);
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switch (mode)
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{
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case regdef:
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case bytedispdef:
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case worddispdef:
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case longdispdef:
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case bytereldef:
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case wordreldef:
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case longreldef:
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/*
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* indirect call: call through pointer
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* either *d(r) as a parameter or local
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* (r) as a return value
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* *f as a global pointer
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* [are there others that we miss?,
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* e.g. arrays of pointers to functions???]
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*/
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arc_add (parent, &indirectchild, (unsigned long) 0);
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length += tahoe_operandlength (instructp + length);
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continue;
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case byterel:
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case wordrel:
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case longrel:
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/*
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* regular pc relative addressing
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* check that this is the address of
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* a function.
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*/
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destpc = pc + tahoe_offset (instructp + length);
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if (hist_check_address (destpc))
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{
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child = sym_lookup (&symtab, destpc);
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DBG (CALLDEBUG,
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printf ("[findcall]\tdestpc 0x%lx",
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(unsigned long) destpc);
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printf (" child->name %s", child->name);
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printf (" child->addr 0x%lx\n",
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(unsigned long) child->addr);
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);
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if (child->addr == destpc)
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{
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/*
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* a hit
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*/
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arc_add (parent, child, (unsigned long) 0);
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length += tahoe_operandlength (instructp + length);
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continue;
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}
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goto botched;
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}
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/*
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* else:
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* it looked like a callf,
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* but it wasn't to anywhere.
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*/
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goto botched;
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default:
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botched:
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/*
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* something funny going on.
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*/
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DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
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length = 1;
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continue;
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}
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}
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}
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}
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