NetBSD/gnu/dist/gprof/tahoe.c

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/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "gprof.h"
#include "cg_arcs.h"
#include "core.h"
#include "hist.h"
#include "symtab.h"
/*
* opcode of the `callf' instruction
*/
#define CALLF 0xfe
/*
* register for pc relative addressing
*/
#define PC 0xf
enum tahoe_opermodes
{
literal, indexed, reg, regdef, autodec, autoinc, autoincdef,
bytedisp, bytedispdef, worddisp, worddispdef, longdisp, longdispdef,
immediate, absolute, byterel, bytereldef, wordrel, wordreldef,
longrel, longreldef
};
typedef enum tahoe_opermodes tahoe_operandenum;
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/*
* A symbol to be the child of indirect callf:
*/
Sym indirectchild;
tahoe_operandenum
tahoe_operandmode (modep)
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unsigned char *modep;
{
long usesreg = ((long) *modep) & 0xf;
switch (((long) *modep) >> 4)
{
case 0:
case 1:
case 2:
case 3:
return literal;
case 4:
return indexed;
case 5:
return reg;
case 6:
return regdef;
case 7:
return autodec;
case 8:
return usesreg != 0xe ? autoinc : immediate;
case 9:
return usesreg != PC ? autoincdef : absolute;
case 10:
return usesreg != PC ? bytedisp : byterel;
case 11:
return usesreg != PC ? bytedispdef : bytereldef;
case 12:
return usesreg != PC ? worddisp : wordrel;
case 13:
return usesreg != PC ? worddispdef : wordreldef;
case 14:
return usesreg != PC ? longdisp : longrel;
case 15:
return usesreg != PC ? longdispdef : longreldef;
}
/* NOTREACHED */
abort ();
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}
char *
tahoe_operandname (mode)
tahoe_operandenum mode;
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{
switch (mode)
{
case literal:
return "literal";
case indexed:
return "indexed";
case reg:
return "register";
case regdef:
return "register deferred";
case autodec:
return "autodecrement";
case autoinc:
return "autoincrement";
case autoincdef:
return "autoincrement deferred";
case bytedisp:
return "byte displacement";
case bytedispdef:
return "byte displacement deferred";
case byterel:
return "byte relative";
case bytereldef:
return "byte relative deferred";
case worddisp:
return "word displacement";
case worddispdef:
return "word displacement deferred";
case wordrel:
return "word relative";
case wordreldef:
return "word relative deferred";
case immediate:
return "immediate";
case absolute:
return "absolute";
case longdisp:
return "long displacement";
case longdispdef:
return "long displacement deferred";
case longrel:
return "long relative";
case longreldef:
return "long relative deferred";
}
/* NOTREACHED */
abort ();
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}
long
tahoe_operandlength (modep)
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unsigned char *modep;
{
switch (tahoe_operandmode (modep))
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{
case literal:
case reg:
case regdef:
case autodec:
case autoinc:
case autoincdef:
return 1;
case bytedisp:
case bytedispdef:
case byterel:
case bytereldef:
return 2;
case worddisp:
case worddispdef:
case wordrel:
case wordreldef:
return 3;
case immediate:
case absolute:
case longdisp:
case longdispdef:
case longrel:
case longreldef:
return 5;
case indexed:
return 1 + tahoe_operandlength (modep + 1);
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}
/* NOTREACHED */
abort ();
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}
bfd_vma
tahoe_reladdr (modep)
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char *modep;
{
tahoe_operandenum mode = tahoe_operandmode (modep);
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char *cp;
short *sp;
long *lp;
int i;
long value = 0;
cp = modep;
++cp; /* skip over the mode */
switch (mode)
{
default:
fprintf (stderr, "[reladdr] not relative address\n");
return (bfd_vma) modep;
case byterel:
return (bfd_vma) (cp + sizeof *cp + *cp);
case wordrel:
for (i = 0; (size_t) i < sizeof *sp; i++)
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value = (value << 8) + (cp[i] & 0xff);
return (bfd_vma) (cp + sizeof *sp + value);
case longrel:
for (i = 0; (size_t) i < sizeof *lp; i++)
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value = (value << 8) + (cp[i] & 0xff);
return (bfd_vma) (cp + sizeof *lp + value);
}
}
void
tahoe_find_call (parent, p_lowpc, p_highpc)
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Sym *parent;
bfd_vma p_lowpc;
bfd_vma p_highpc;
{
unsigned char *instructp;
long length;
Sym *child;
tahoe_operandenum mode;
tahoe_operandenum firstmode;
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bfd_vma destpc;
static bool inited = FALSE;
if (!inited)
{
inited = TRUE;
sym_init (&indirectchild);
indirectchild.cg.prop.fract = 1.0;
indirectchild.cg.cyc.head = &indirectchild;
}
if (core_text_space == 0)
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{
return;
}
if (p_lowpc < s_lowpc)
{
p_lowpc = s_lowpc;
}
if (p_highpc > s_highpc)
{
p_highpc = s_highpc;
}
DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n",
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parent->name, p_lowpc, p_highpc));
for (instructp = (unsigned char *) core_text_space + p_lowpc;
instructp < (unsigned char *) core_text_space + p_highpc;
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instructp += length)
{
length = 1;
if (*instructp == CALLF)
{
/*
* maybe a callf, better check it out.
* skip the count of the number of arguments.
*/
DBG (CALLDEBUG, printf ("[findcall]\t0x%x:callf",
instructp - (unsigned char *) core_text_space));
firstmode = tahoe_operandmode (instructp + length);
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switch (firstmode)
{
case literal:
case immediate:
break;
default:
goto botched;
}
length += tahoe_operandlength (instructp + length);
mode = tahoe_operandmode (instructp + length);
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DBG (CALLDEBUG,
printf ("\tfirst operand is %s", tahoe_operandname (firstmode));
printf ("\tsecond operand is %s\n", tahoe_operandname (mode));
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);
switch (mode)
{
case regdef:
case bytedispdef:
case worddispdef:
case longdispdef:
case bytereldef:
case wordreldef:
case longreldef:
/*
* indirect call: call through pointer
* either *d(r) as a parameter or local
* (r) as a return value
* *f as a global pointer
* [are there others that we miss?,
* e.g. arrays of pointers to functions???]
*/
arc_add (parent, &indirectchild, (long) 0);
length += tahoe_operandlength (instructp + length);
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continue;
case byterel:
case wordrel:
case longrel:
/*
* regular pc relative addressing
* check that this is the address of
* a function.
*/
destpc = tahoe_reladdr (instructp + length)
- (bfd_vma) core_text_space;
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if (destpc >= s_lowpc && destpc <= s_highpc)
{
child = sym_lookup (&symtab, destpc);
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DBG (CALLDEBUG,
printf ("[findcall]\tdestpc 0x%lx", destpc);
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printf (" child->name %s", child->name);
printf (" child->addr 0x%lx\n", child->addr);
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);
if (child->addr == destpc)
{
/*
* a hit
*/
arc_add (parent, child, (long) 0);
length += tahoe_operandlength (instructp + length);
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continue;
}
goto botched;
}
/*
* else:
* it looked like a callf,
* but it wasn't to anywhere.
*/
goto botched;
default:
botched:
/*
* something funny going on.
*/
DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n"));
length = 1;
continue;
}
}
}
}