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/* Function return value location for Alpha ELF ABI.
Copyright (C) 2005, 2007, 2014 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <dwarf.h>
#define BACKEND alpha_
#include "libebl_CPU.h"
/* $0. */
static const Dwarf_Op loc_intreg[] =
{
{ .atom = DW_OP_reg0 }
};
#define nloc_intreg 1
/* $f0, or pair $f0, $f1. */
static const Dwarf_Op loc_fpreg[] =
{
{ .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
{ .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
};
#define nloc_fpreg 1
#define nloc_fpregpair 4
/* The return value is a structure and is actually stored in stack space
passed in a hidden argument by the caller. But, the compiler
helpfully returns the address of that space in $0. */
static const Dwarf_Op loc_aggregate[] =
{
{ .atom = DW_OP_breg0, .number = 0 }
};
#define nloc_aggregate 1
int
alpha_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Die die_mem, *typedie = &die_mem;
int tag = dwarf_peeled_die_type (functypedie, typedie);
if (tag <= 0)
return tag;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
Dwarf_Attribute attr_mem, *attr;
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
FALLTHROUGH;
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
{
Dwarf_Attribute attr_mem;
Dwarf_Word size;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 8;
else
return -1;
}
if (tag == DW_TAG_base_type)
{
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
*locp = loc_fpreg;
if (encoding == DW_ATE_float)
{
if (size <= 8)
return nloc_fpreg;
goto aggregate;
}
if (encoding == DW_ATE_complex_float)
{
if (size <= 8 * 2)
return nloc_fpregpair;
goto aggregate;
}
}
if (size <= 8)
{
*locp = loc_intreg;
return nloc_intreg;
}
}
FALLTHROUGH;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
case DW_TAG_string_type:
case DW_TAG_array_type:
aggregate:
*locp = loc_aggregate;
return nloc_aggregate;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
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