Branch data Line data Source code
1 : : /* Function return value location for SPARC.
2 : : Copyright (C) 2006-2010, 2014 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : :
5 : : This file is free software; you can redistribute it and/or modify
6 : : it under the terms of either
7 : :
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
11 : :
12 : : or
13 : :
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
17 : :
18 : : or both in parallel, as here.
19 : :
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.
24 : :
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/>. */
28 : :
29 : : #ifdef HAVE_CONFIG_H
30 : : # include <config.h>
31 : : #endif
32 : :
33 : : #include <assert.h>
34 : : #include <dwarf.h>
35 : :
36 : : #define BACKEND sparc_
37 : : #include "libebl_CPU.h"
38 : :
39 : :
40 : : /* %o0, or pair %o0, %o1. */
41 : : static const Dwarf_Op loc_intreg[] =
42 : : {
43 : : { .atom = DW_OP_reg8 }, { .atom = DW_OP_piece, .number = 4 },
44 : : { .atom = DW_OP_reg9 }, { .atom = DW_OP_piece, .number = 4 },
45 : : };
46 : : #define nloc_intreg 1
47 : : #define nloc_intregpair 4
48 : :
49 : : /* %f0 or pair %f0, %f1, or quad %f0..%f3. */
50 : : static const Dwarf_Op loc_fpreg[] =
51 : : {
52 : : { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
53 : : { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
54 : : { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 4 },
55 : : { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 4 },
56 : : };
57 : : #define nloc_fpreg 1
58 : : #define nloc_fpregpair 4
59 : : #define nloc_fpregquad 8
60 : :
61 : : /* The return value is a structure and is actually stored in stack space
62 : : passed in a hidden argument by the caller. But, the compiler
63 : : helpfully returns the address of that space in %o0. */
64 : : static const Dwarf_Op loc_aggregate[] =
65 : : {
66 : : { .atom = DW_OP_breg8, .number = 0 }
67 : : };
68 : : #define nloc_aggregate 1
69 : :
70 : : int
71 : 0 : sparc_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
72 : : {
73 : : /* Start with the function's type, and get the DW_AT_type attribute,
74 : : which is the type of the return value. */
75 : 0 : Dwarf_Die die_mem, *typedie = &die_mem;
76 : 0 : int tag = dwarf_peeled_die_type (functypedie, typedie);
77 [ # # ]: 0 : if (tag <= 0)
78 : : return tag;
79 : :
80 : 0 : Dwarf_Word size;
81 [ # # # # ]: 0 : switch (tag)
82 : : {
83 : : case -1:
84 : : return -1;
85 : :
86 : 0 : case DW_TAG_subrange_type:
87 [ # # ]: 0 : if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
88 : : {
89 : 0 : Dwarf_Attribute attr_mem, *attr;
90 : 0 : attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
91 : 0 : typedie = dwarf_formref_die (attr, &die_mem);
92 [ # # ]: 0 : tag = DWARF_TAG_OR_RETURN (typedie);
93 : : }
94 : 0 : FALLTHROUGH;
95 : :
96 : : case DW_TAG_base_type:
97 : : case DW_TAG_enumeration_type:
98 : : CASE_POINTER:
99 : : {
100 : 0 : Dwarf_Attribute attr_mem;
101 [ # # ]: 0 : if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
102 : : &attr_mem), &size) != 0)
103 : : {
104 : 0 : uint8_t asize;
105 : 0 : Dwarf_Die cudie;
106 [ # # ]: 0 : if (dwarf_is_pointer (tag)
107 [ # # ]: 0 : && dwarf_diecu (typedie, &cudie, &asize, NULL) != NULL)
108 : 0 : size = asize;
109 : : else
110 : 0 : return -1;
111 : : }
112 : : }
113 : :
114 [ # # ]: 0 : if (tag == DW_TAG_base_type)
115 : : {
116 : 0 : Dwarf_Attribute attr_mem;
117 : 0 : Dwarf_Word encoding;
118 [ # # ]: 0 : if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
119 : : &attr_mem),
120 : : &encoding) != 0)
121 : 0 : return -1;
122 [ # # ]: 0 : if (encoding == DW_ATE_float)
123 : : {
124 : 0 : *locp = loc_fpreg;
125 [ # # ]: 0 : if (size <= 4)
126 : : return nloc_fpreg;
127 [ # # ]: 0 : if (size <= 8)
128 : : return nloc_fpregpair;
129 [ # # ]: 0 : if (size <= 16)
130 : : return nloc_fpregquad;
131 : : }
132 : : }
133 [ # # ]: 0 : if (size <= 8)
134 : : {
135 : 0 : intreg:
136 : 0 : *locp = loc_intreg;
137 [ # # ]: 0 : return size <= 4 ? nloc_intreg : nloc_intregpair;
138 : : }
139 : :
140 : 0 : aggregate:
141 : 0 : *locp = loc_aggregate;
142 : 0 : return nloc_aggregate;
143 : :
144 : 0 : case DW_TAG_structure_type:
145 : : case DW_TAG_class_type:
146 : : case DW_TAG_union_type:
147 : : case DW_TAG_array_type:
148 [ # # ]: 0 : if (dwarf_aggregate_size (typedie, &size) == 0
149 [ # # # # ]: 0 : && size > 0 && size <= 8)
150 : 0 : goto intreg;
151 : 0 : goto aggregate;
152 : : }
153 : :
154 : : /* XXX We don't have a good way to return specific errors from ebl calls.
155 : : This value means we do not understand the type, but it is well-formed
156 : : DWARF and might be valid. */
157 : : return -2;
158 : : }
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