1 /* Function return value location for Linux/PPC64 ABI.
2 Copyright (C) 2005-2010 Red Hat, Inc.
3 This file is part of elfutils.
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
18 or both in parallel, as here.
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
36 #define BACKEND ppc64_
37 #include "libebl_CPU.h"
41 static const Dwarf_Op loc_intreg[] =
43 { .atom = DW_OP_reg3 }
47 /* f1, or f1:f2, or f1:f4. */
48 static const Dwarf_Op loc_fpreg[] =
50 { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 8 },
51 { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
52 { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 8 },
53 { .atom = DW_OP_regx, .number = 36 }, { .atom = DW_OP_piece, .number = 8 },
56 #define nloc_fp2regs 4
57 #define nloc_fp4regs 8
60 static const Dwarf_Op loc_vmxreg[] =
62 { .atom = DW_OP_regx, .number = 1124 + 2 }
66 /* The return value is a structure and is actually stored in stack space
67 passed in a hidden argument by the caller. But, the compiler
68 helpfully returns the address of that space in r3. */
69 static const Dwarf_Op loc_aggregate[] =
71 { .atom = DW_OP_breg3, .number = 0 }
73 #define nloc_aggregate 1
76 ppc64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
78 /* Start with the function's type, and get the DW_AT_type attribute,
79 which is the type of the return value. */
81 Dwarf_Attribute attr_mem;
82 Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
85 /* The function has no return value, like a `void' function in C. */
89 Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
90 int tag = dwarf_tag (typedie);
92 /* Follow typedefs and qualifiers to get to the actual type. */
93 while (tag == DW_TAG_typedef
94 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
95 || tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
97 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
98 typedie = dwarf_formref_die (attr, &die_mem);
99 tag = dwarf_tag (typedie);
108 case DW_TAG_subrange_type:
109 if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
111 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
112 typedie = dwarf_formref_die (attr, &die_mem);
113 tag = dwarf_tag (typedie);
117 case DW_TAG_base_type:
118 case DW_TAG_enumeration_type:
119 case DW_TAG_pointer_type:
120 case DW_TAG_ptr_to_member_type:
121 if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
122 &attr_mem), &size) != 0)
124 if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
129 if (tag == DW_TAG_base_type)
132 if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
137 if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
155 /* Else fall through. */
156 case DW_TAG_structure_type:
157 case DW_TAG_class_type:
158 case DW_TAG_union_type:
160 *locp = loc_aggregate;
161 return nloc_aggregate;
163 case DW_TAG_array_type:
166 if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
167 &attr_mem), &is_vector) == 0
176 case DW_TAG_string_type:
177 if (dwarf_aggregate_size (typedie, &size) == 0 && size <= 8)
179 if (tag == DW_TAG_array_type)
181 /* Check if it's a character array. */
182 attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
183 typedie = dwarf_formref_die (attr, &die_mem);
184 tag = dwarf_tag (typedie);
185 if (tag != DW_TAG_base_type)
187 if (dwarf_formudata (dwarf_attr_integrate (typedie,
200 /* XXX We don't have a good way to return specific errors from ebl calls.
201 This value means we do not understand the type, but it is well-formed
202 DWARF and might be valid. */