1 /* ARC-specific header file for PLT support.
2    Copyright (C) 2016 Free Software Foundation, Inc.
3    Contributed by Cupertino Miranda (cmiranda@synopsys.com).
4 
5    This file is part of BFD, the Binary File Descriptor library.
6 
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11 
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16 
17    You should have received a copy of the GNU General Public License
18    along with this program; if not, write to the Free Software
19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20    MA 02110-1301, USA.  */
21 
22 #ifndef ARC_PLT_H
23 #define ARC_PLT_H
24 
25 #include <stdint.h>
26 
27 /* Instructions appear in memory as a sequence of half-words (16 bit);
28    individual half-words are represented on the target in target byte order.
29    We use 'unsigned short' on the host to represent the PLT templates,
30    and translate to target byte order as we copy to the target.  */
31 typedef uint16_t insn_hword;
32 
33 enum plt_reloc_symbol
34 {
35   LAST_RELOC = 0,
36 
37   SGOT = 1,
38 
39   RELATIVE = (1 << 8),
40   RELATIVE_INSN_32 = (1 << 9),
41   RELATIVE_INSN_24 = (1 << 10),
42 
43   MIDDLE_ENDIAN = (1 << 11)
44 };
45 
46 #define IS_RELATIVE(S)      ((S & (RELATIVE | RELATIVE_INSN_24 | RELATIVE_INSN_32)) != 0)
47 #define IS_INSN_32(S)       ((S & RELATIVE_INSN_32) != 0)
48 #define IS_INSN_24(S)       ((S & RELATIVE_INSN_24) != 0)
49 #define IS_MIDDLE_ENDIAN(S) ((S & MIDDLE_ENDIAN) != 0)
50 #define SYM_ONLY(S)         (S & 0xFF)
51 
52 struct plt_reloc
53 {
54   bfd_vma	  offset;
55   bfd_vma	  size;
56   bfd_vma	  mask;
57   enum plt_reloc_symbol symbol;
58   bfd_vma	  addend;
59 };
60 
61 
62 #define PLT_TYPE_START(NAME) NAME,
63 #define PLT_TYPE_END(NAME)
64 #define PLT_ENTRY(...)
65 #define PLT_ELEM(...)
66 #define ENTRY_RELOC(...)
67 #define ELEM_RELOC(...)
68 
69 enum plt_types_enum
70 {
71   PLT_START = -1,
72 #include "arc-plt.def"
73   PLT_MAX
74 };
75 
76 #undef PLT_TYPE_START
77 #undef PLT_TYPE_END
78 #undef PLT_ENTRY
79 #undef PLT_ELEM
80 #undef ENTRY_RELOC
81 #undef ELEM_RELOC
82 
83 typedef insn_hword insn_hword_array[];
84 
85 struct plt_version_t
86 {
87   const insn_hword_array *entry;
88   const bfd_vma		  entry_size;
89   const insn_hword_array *elem;
90   const bfd_vma		  elem_size;
91 
92   const struct plt_reloc *entry_relocs;
93   const struct plt_reloc *elem_relocs;
94 };
95 
96 #define PLT_TYPE_START(NAME) \
97   const insn_hword NAME##_plt_entry[] = {
98 #define PLT_TYPE_END(NAME) };
99 #define PLT_ENTRY(...) __VA_ARGS__,
100 #define PLT_ELEM(...)
101 #define ENTRY_RELOC(...)
102 #define ELEM_RELOC(...)
103 
104 #include "arc-plt.def"
105 
106 #undef PLT_TYPE_START
107 #undef PLT_TYPE_END
108 #undef PLT_ENTRY
109 #undef PLT_ELEM
110 #undef ENTRY_RELOC
111 #undef ELEM_RELOC
112 
113 #define PLT_TYPE_START(NAME) \
114   const struct plt_reloc NAME##_plt_entry_relocs[] = {
115 #define PLT_TYPE_END(NAME) \
116     {0, 0, 0, LAST_RELOC, 0} \
117   };
118 #define PLT_ENTRY(...)
119 #define PLT_ELEM(...)
120 #define ENTRY_RELOC(...) { __VA_ARGS__ },
121 #define ELEM_RELOC(...)
122 
123 #include "arc-plt.def"
124 
125 #undef PLT_TYPE_START
126 #undef PLT_TYPE_END
127 #undef PLT_ENTRY
128 #undef PLT_ELEM
129 #undef ENTRY_RELOC
130 #undef ELEM_RELOC
131 
132 
133 #define PLT_TYPE_START(NAME) \
134   const insn_hword NAME##_plt_elem[] = {
135 #define PLT_TYPE_END(NAME) };
136 #define PLT_ENTRY(...)
137 #define PLT_ELEM(...) __VA_ARGS__,
138 #define ENTRY_RELOC(...)
139 #define ELEM_RELOC(...)
140 
141 #include "arc-plt.def"
142 
143 #undef PLT_TYPE_START
144 #undef PLT_TYPE_END
145 #undef PLT_ENTRY
146 #undef PLT_ELEM
147 #undef ENTRY_RELOC
148 #undef ELEM_RELOC
149 
150 #define PLT_TYPE_START(NAME) \
151   const struct plt_reloc NAME##_plt_elem_relocs[] = {
152 #define PLT_TYPE_END(NAME) \
153     {0, 0, 0, LAST_RELOC, 0} \
154   };
155 #define PLT_ENTRY(...)
156 #define PLT_ELEM(...)
157 #define ENTRY_RELOC(...)
158 #define ELEM_RELOC(...) { __VA_ARGS__ },
159 
160 #include "arc-plt.def"
161 
162 #undef PLT_TYPE_START
163 #undef PLT_TYPE_END
164 #undef PLT_ENTRY
165 #undef PLT_ELEM
166 #undef ENTRY_RELOC
167 #undef ELEM_RELOC
168 
169 
170 #define PLT_TYPE_START(NAME) \
171   { \
172     .entry = &NAME##_plt_entry, \
173     .entry_size = sizeof (NAME##_plt_entry), \
174     .elem = &NAME##_plt_elem, \
175     .elem_size = sizeof (NAME##_plt_elem),  \
176     .entry_relocs = NAME##_plt_entry_relocs, \
177     .elem_relocs = NAME##_plt_elem_relocs
178 #define PLT_TYPE_END(NAME) },
179 #define PLT_ENTRY(...)
180 #define PLT_ELEM(...)
181 #define ENTRY_RELOC(...)
182 #define ELEM_RELOC(...)
183 struct plt_version_t plt_versions[PLT_MAX] = {
184 
185 #include "arc-plt.def"
186 
187 };
188 #undef PLT_TYPE_START
189 #undef PLT_TYPE_END
190 #undef PLT_ENTRY
191 #undef PLT_ELEM
192 #undef ENTRY_RELOC
193 #undef ELEM_RELOC
194 
195 
196 #endif /* ARC_PLT_H */
197