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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"
/*
* 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
{
signed disp:21;
unsigned ra:5;
unsigned op_code:6;
}
b; /* branch format */
struct
{
signed hint:14;
unsigned func:2;
unsigned rb:5;
unsigned ra:5;
unsigned op_code:6;
}
j; /* jump format */
}
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
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;
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, p_lowpc, p_highpc));
for (pc = (Instruction *) (p_lowpc + delta);
pc < (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",
(bfd_vma) pc - delta,
pc->j.func == Jxx_FUNC_JSR ? "" : "_coroutine"));
arc_add (parent, &indirect_child, 0);
}
break;
case OP_BSR:
DBG (CALLDEBUG,
printf ("[find_call] 0x%lx: bsr", (bfd_vma) 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",
dest_pc, child->name, child->addr));
if (child->addr == dest_pc || child->addr == dest_pc - 8)
{
DBG (CALLDEBUG, printf ("\n"));
/* a hit: */
arc_add (parent, child, 0);
continue;
}
}
/*
* Something funny going on.
*/
DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
break;
default:
break;
}
}
}
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