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/*
* Copyright (c) 1983, 1993, 1998
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "gprof.h"
#include "cg_arcs.h"
#include "corefile.h"
#include "hist.h"
#include "symtab.h"
/*
* Opcodes of the call instructions:
*/
#define OP_Jxx 0x1a
#define OP_BSR 0x34
#define Jxx_FUNC_JMP 0
#define Jxx_FUNC_JSR 1
#define Jxx_FUNC_RET 2
#define Jxx_FUNC_JSR_COROUTINE 3
typedef union
{
struct
{
unsigned other:26;
unsigned op_code:6;
}
a; /* any format */
struct
{
int disp:21;
unsigned ra:5;
unsigned op_code:6;
}
b; /* branch format */
struct
{
int hint:14;
unsigned func:2;
unsigned rb:5;
unsigned ra:5;
unsigned op_code:6;
}
j; /* jump format */
}
alpha_Instruction;
static Sym indirect_child;
/*
* On the Alpha we can only detect PC relative calls, which are
* usually generated for calls to functions within the same
* object file only. This is still better than nothing, however.
* (In particular it should be possible to find functions that
* potentially call integer division routines, for example.)
*/
void
alpha_find_call (parent, p_lowpc, p_highpc)
Sym *parent;
bfd_vma p_lowpc;
bfd_vma p_highpc;
{
static bfd_vma delta = 0;
bfd_vma dest_pc;
alpha_Instruction *pc;
Sym *child;
if (!delta)
{
delta = (bfd_vma) core_text_space - core_text_sect->vma;
sym_init (&indirect_child);
indirect_child.name = _("<indirect child>");
indirect_child.cg.prop.fract = 1.0;
indirect_child.cg.cyc.head = &indirect_child;
}
if (!core_text_space)
{
return;
}
if (p_lowpc < s_lowpc)
{
p_lowpc = s_lowpc;
}
if (p_highpc > s_highpc)
{
p_highpc = s_highpc;
}
DBG (CALLDEBUG, printf (_("[find_call] %s: 0x%lx to 0x%lx\n"),
parent->name, (unsigned long) p_lowpc,
(unsigned long) p_highpc));
for (pc = (alpha_Instruction *) (p_lowpc + delta);
pc < (alpha_Instruction *) (p_highpc + delta);
++pc)
{
switch (pc->a.op_code)
{
case OP_Jxx:
/*
* There is no simple and reliable way to determine the
* target of a jsr (the hint bits help, but there aren't
* enough bits to get a satisfactory hit rate). Instead,
* for any indirect jump we simply add an arc from PARENT
* to INDIRECT_CHILD---that way the user it at least able
* to see that there are other calls as well.
*/
if (pc->j.func == Jxx_FUNC_JSR
|| pc->j.func == Jxx_FUNC_JSR_COROUTINE)
{
DBG (CALLDEBUG,
printf (_("[find_call] 0x%lx: jsr%s <indirect_child>\n"),
(unsigned long) pc - delta,
pc->j.func == Jxx_FUNC_JSR ? "" : "_coroutine"));
arc_add (parent, &indirect_child, (unsigned long) 0);
}
break;
case OP_BSR:
DBG (CALLDEBUG,
printf (_("[find_call] 0x%lx: bsr"),
(unsigned long) pc - delta));
/*
* Regular PC relative addressing. Check that this is the
* address of a function. The linker sometimes redirects
* the entry point by 8 bytes to skip loading the global
* pointer, so we all for either address:
*/
dest_pc = ((bfd_vma) (pc + 1 + pc->b.disp)) - delta;
if (dest_pc >= s_lowpc && dest_pc <= s_highpc)
{
child = sym_lookup (&symtab, dest_pc);
DBG (CALLDEBUG,
printf (" 0x%lx\t; name=%s, addr=0x%lx",
(unsigned long) dest_pc, child->name,
(unsigned long) child->addr));
if (child->addr == dest_pc || child->addr == dest_pc - 8)
{
DBG (CALLDEBUG, printf ("\n"));
/* a hit: */
arc_add (parent, child, (unsigned long) 0);
continue;
}
}
/*
* Something funny going on.
*/
DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
break;
default:
break;
}
}
}
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