1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* Function return value location for Linux/PPC64 ABI.
Copyright (C) 2005-2010, 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 ppc64_
#include "libebl_CPU.h"
/* r3. */
static const Dwarf_Op loc_intreg[] =
{
{ .atom = DW_OP_reg3 }
};
#define nloc_intreg 1
/* f1, or f1:f2, or f1:f4. */
static const Dwarf_Op loc_fpreg[] =
{
{ .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 8 },
{ .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
{ .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 8 },
{ .atom = DW_OP_regx, .number = 36 }, { .atom = DW_OP_piece, .number = 8 },
};
#define nloc_fpreg 1
#define nloc_fp2regs 4
#define nloc_fp4regs 8
/* vr2. */
static const Dwarf_Op loc_vmxreg[] =
{
{ .atom = DW_OP_regx, .number = 1124 + 2 }
};
#define nloc_vmxreg 1
/* 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 r3. */
static const Dwarf_Op loc_aggregate[] =
{
{ .atom = DW_OP_breg3, .number = 0 }
};
#define nloc_aggregate 1
int
ppc64_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;
Dwarf_Word size;
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;
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_Attribute attr_mem;
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
{
*locp = loc_fpreg;
if (size <= 8)
return nloc_fpreg;
if (size <= 16)
return nloc_fp2regs;
if (size <= 32)
return nloc_fp4regs;
}
}
if (size <= 8)
{
intreg:
*locp = loc_intreg;
return nloc_intreg;
}
FALLTHROUGH;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
aggregate:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_array_type:
{
Dwarf_Attribute attr_mem;
bool is_vector;
if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
&attr_mem), &is_vector) == 0
&& is_vector)
{
*locp = loc_vmxreg;
return nloc_vmxreg;
}
}
FALLTHROUGH;
case DW_TAG_string_type:
if (dwarf_aggregate_size (typedie, &size) == 0 && size <= 8)
{
if (tag == DW_TAG_array_type)
{
/* Check if it's a character array. */
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);
if (tag != DW_TAG_base_type)
goto aggregate;
if (dwarf_formudata (dwarf_attr_integrate (typedie,
DW_AT_byte_size,
&attr_mem),
&size) != 0)
return -1;
if (size != 1)
goto aggregate;
}
goto intreg;
}
goto 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;
}
|
