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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 "search_list.h"
#include "source.h"
#include "symtab.h"
#include "cg_arcs.h"
#include "corefile.h"
#include "hist.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
/* *INDENT-OFF* */
/* Here to document only. We can't use this when cross compiling as
the bitfield layout might not be the same as native.
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;
*/
/* *INDENT-ON* */
static Sym indirect_child;
void alpha_find_call (Sym *, bfd_vma, bfd_vma);
/*
* 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 (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
{
bfd_vma pc, dest_pc;
unsigned int insn;
Sym *child;
if (indirect_child.name == NULL)
{
sym_init (&indirect_child);
indirect_child.name = _("<indirect child>");
indirect_child.cg.prop.fract = 1.0;
indirect_child.cg.cyc.head = &indirect_child;
}
DBG (CALLDEBUG, printf (_("[find_call] %s: 0x%lx to 0x%lx\n"),
parent->name, (unsigned long) p_lowpc,
(unsigned long) p_highpc));
for (pc = (p_lowpc + 3) & ~(bfd_vma) 3; pc < p_highpc; pc += 4)
{
insn = bfd_get_32 (core_bfd, ((unsigned char *) core_text_space
+ pc - core_text_sect->vma));
switch (insn & (0x3f << 26))
{
case OP_Jxx << 26:
/*
* 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 ((insn & (3 << 14)) == Jxx_FUNC_JSR << 14
|| (insn & (3 << 14)) == Jxx_FUNC_JSR_COROUTINE << 14)
{
DBG (CALLDEBUG,
printf (_("[find_call] 0x%lx: jsr%s <indirect_child>\n"),
(unsigned long) pc,
((insn & (3 << 14)) == Jxx_FUNC_JSR << 14
? "" : "_coroutine")));
arc_add (parent, &indirect_child, (unsigned long) 0);
}
break;
case OP_BSR << 26:
DBG (CALLDEBUG,
printf (_("[find_call] 0x%lx: bsr"), (unsigned long) pc));
/*
* 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 allow for either address:
*/
dest_pc = pc + 4 + (((bfd_signed_vma) (insn & 0x1fffff)
^ 0x100000) - 0x100000);
if (hist_check_address (dest_pc))
{
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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