1 /* Function return value location for Linux/PPC64 ABI.
2 Copyright (C) 2005-2010 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
5 Red Hat elfutils is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by the
7 Free Software Foundation; version 2 of the License.
9 Red Hat elfutils is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with Red Hat elfutils; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18 Red Hat elfutils is an included package of the Open Invention Network.
19 An included package of the Open Invention Network is a package for which
20 Open Invention Network licensees cross-license their patents. No patent
21 license is granted, either expressly or impliedly, by designation as an
22 included package. Should you wish to participate in the Open Invention
23 Network licensing program, please visit www.openinventionnetwork.com
24 <http://www.openinventionnetwork.com>. */
33 #define BACKEND ppc64_
34 #include "libebl_CPU.h"
38 static const Dwarf_Op loc_intreg[] =
40 { .atom = DW_OP_reg3 }
44 /* f1, or f1:f2, or f1:f4. */
45 static const Dwarf_Op loc_fpreg[] =
47 { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 8 },
48 { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
49 { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 8 },
50 { .atom = DW_OP_regx, .number = 36 }, { .atom = DW_OP_piece, .number = 8 },
53 #define nloc_fp2regs 4
54 #define nloc_fp4regs 8
57 static const Dwarf_Op loc_vmxreg[] =
59 { .atom = DW_OP_regx, .number = 1124 + 2 }
63 /* The return value is a structure and is actually stored in stack space
64 passed in a hidden argument by the caller. But, the compiler
65 helpfully returns the address of that space in r3. */
66 static const Dwarf_Op loc_aggregate[] =
68 { .atom = DW_OP_breg3, .number = 0 }
70 #define nloc_aggregate 1
73 ppc64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
75 /* Start with the function's type, and get the DW_AT_type attribute,
76 which is the type of the return value. */
78 Dwarf_Attribute attr_mem;
79 Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
82 /* The function has no return value, like a `void' function in C. */
86 Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
87 int tag = dwarf_tag (typedie);
89 /* Follow typedefs and qualifiers to get to the actual type. */
90 while (tag == DW_TAG_typedef
91 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
92 || tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
94 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
95 typedie = dwarf_formref_die (attr, &die_mem);
96 tag = dwarf_tag (typedie);
105 case DW_TAG_subrange_type:
106 if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
108 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
109 typedie = dwarf_formref_die (attr, &die_mem);
110 tag = dwarf_tag (typedie);
114 case DW_TAG_base_type:
115 case DW_TAG_enumeration_type:
116 case DW_TAG_pointer_type:
117 case DW_TAG_ptr_to_member_type:
118 if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
119 &attr_mem), &size) != 0)
121 if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
126 if (tag == DW_TAG_base_type)
129 if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
134 if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
152 /* Else fall through. */
153 case DW_TAG_structure_type:
154 case DW_TAG_class_type:
155 case DW_TAG_union_type:
157 *locp = loc_aggregate;
158 return nloc_aggregate;
160 case DW_TAG_array_type:
163 if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
164 &attr_mem), &is_vector) == 0
173 case DW_TAG_string_type:
174 if (dwarf_aggregate_size (typedie, &size) == 0 && size <= 8)
176 if (tag == DW_TAG_array_type)
178 /* Check if it's a character array. */
179 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
180 typedie = dwarf_formref_die (attr, &die_mem);
181 tag = dwarf_tag (typedie);
182 if (tag != DW_TAG_base_type)
184 if (dwarf_formudata (dwarf_attr_integrate (typedie,
197 /* XXX We don't have a good way to return specific errors from ebl calls.
198 This value means we do not understand the type, but it is well-formed
199 DWARF and might be valid. */