1 |
/* Motorola 68HC11-specific support for 32-bit ELF |
/* Motorola 68HC11-specific support for 32-bit ELF |
2 |
Copyright 1999, 2000 Free Software Foundation, Inc. |
Copyright 1999, 2000, 2001, 2002, 2003, 2004 |
3 |
Contributed by Stephane Carrez (stcarrez@worldnet.fr) |
Free Software Foundation, Inc. |
4 |
|
Contributed by Stephane Carrez (stcarrez@nerim.fr) |
5 |
(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
6 |
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|
7 |
This file is part of BFD, the Binary File Descriptor library. |
This file is part of BFD, the Binary File Descriptor library. |
22 |
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|
23 |
#include "bfd.h" |
#include "bfd.h" |
24 |
#include "sysdep.h" |
#include "sysdep.h" |
25 |
|
#include "bfdlink.h" |
26 |
#include "libbfd.h" |
#include "libbfd.h" |
27 |
#include "elf-bfd.h" |
#include "elf-bfd.h" |
28 |
|
#include "elf32-m68hc1x.h" |
29 |
#include "elf/m68hc11.h" |
#include "elf/m68hc11.h" |
30 |
|
#include "opcode/m68hc11.h" |
31 |
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32 |
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/* Relocation functions. */ |
33 |
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
34 |
PARAMS ((bfd * abfd, bfd_reloc_code_real_type code)); |
(bfd *, bfd_reloc_code_real_type); |
35 |
static void m68hc11_info_to_howto_rel |
static void m68hc11_info_to_howto_rel |
36 |
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
(bfd *, arelent *, Elf_Internal_Rela *); |
37 |
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|
38 |
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/* Trampoline generation. */ |
39 |
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static bfd_boolean m68hc11_elf_size_one_stub |
40 |
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(struct bfd_hash_entry *gen_entry, void *in_arg); |
41 |
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static bfd_boolean m68hc11_elf_build_one_stub |
42 |
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(struct bfd_hash_entry *gen_entry, void *in_arg); |
43 |
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static struct bfd_link_hash_table* m68hc11_elf_bfd_link_hash_table_create |
44 |
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(bfd* abfd); |
45 |
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|
46 |
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/* Linker relaxation. */ |
47 |
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static bfd_boolean m68hc11_elf_relax_section |
48 |
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(bfd *, asection *, struct bfd_link_info *, bfd_boolean *); |
49 |
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static void m68hc11_elf_relax_delete_bytes |
50 |
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(bfd *, asection *, bfd_vma, int); |
51 |
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static void m68hc11_relax_group |
52 |
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(bfd *, asection *, bfd_byte *, unsigned, unsigned long, unsigned long); |
53 |
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static int compare_reloc (const void *, const void *); |
54 |
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|
55 |
/* Use REL instead of RELA to save space */ |
/* Use REL instead of RELA to save space */ |
56 |
#define USE_REL |
#define USE_REL 1 |
57 |
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|
58 |
/* The Motorola 68HC11 microcontroler only addresses 64Kb. |
/* The Motorola 68HC11 microcontroller only addresses 64Kb but we also |
59 |
|
support a memory bank switching mechanism similar to 68HC12. |
60 |
We must handle 8 and 16-bit relocations. The 32-bit relocation |
We must handle 8 and 16-bit relocations. The 32-bit relocation |
61 |
is defined but not used except by gas when -gstabs is used (which |
are used for debugging sections (DWARF2) to represent a virtual |
62 |
is wrong). |
address. |
63 |
The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
64 |
static reloc_howto_type elf_m68hc11_howto_table[] = { |
static reloc_howto_type elf_m68hc11_howto_table[] = { |
65 |
/* This reloc does nothing. */ |
/* This reloc does nothing. */ |
67 |
0, /* rightshift */ |
0, /* rightshift */ |
68 |
2, /* size (0 = byte, 1 = short, 2 = long) */ |
2, /* size (0 = byte, 1 = short, 2 = long) */ |
69 |
32, /* bitsize */ |
32, /* bitsize */ |
70 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
71 |
0, /* bitpos */ |
0, /* bitpos */ |
72 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_dont,/* complain_on_overflow */ |
73 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
74 |
"R_M68HC11_NONE", /* name */ |
"R_M68HC11_NONE", /* name */ |
75 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
76 |
0, /* src_mask */ |
0, /* src_mask */ |
77 |
0, /* dst_mask */ |
0, /* dst_mask */ |
78 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
79 |
|
|
80 |
/* A 8 bit absolute relocation */ |
/* A 8 bit absolute relocation */ |
81 |
HOWTO (R_M68HC11_8, /* type */ |
HOWTO (R_M68HC11_8, /* type */ |
82 |
0, /* rightshift */ |
0, /* rightshift */ |
83 |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
84 |
8, /* bitsize */ |
8, /* bitsize */ |
85 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
86 |
0, /* bitpos */ |
0, /* bitpos */ |
87 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_bitfield, /* complain_on_overflow */ |
88 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
89 |
"R_M68HC11_8", /* name */ |
"R_M68HC11_8", /* name */ |
90 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
91 |
0x00ff, /* src_mask */ |
0x00ff, /* src_mask */ |
92 |
0x00ff, /* dst_mask */ |
0x00ff, /* dst_mask */ |
93 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
94 |
|
|
95 |
/* A 8 bit absolute relocation (upper address) */ |
/* A 8 bit absolute relocation (upper address) */ |
96 |
HOWTO (R_M68HC11_HI8, /* type */ |
HOWTO (R_M68HC11_HI8, /* type */ |
97 |
8, /* rightshift */ |
8, /* rightshift */ |
98 |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
99 |
8, /* bitsize */ |
8, /* bitsize */ |
100 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
101 |
0, /* bitpos */ |
0, /* bitpos */ |
102 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_bitfield, /* complain_on_overflow */ |
103 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
104 |
"R_M68HC11_HI8", /* name */ |
"R_M68HC11_HI8", /* name */ |
105 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
106 |
0x00ff, /* src_mask */ |
0x00ff, /* src_mask */ |
107 |
0x00ff, /* dst_mask */ |
0x00ff, /* dst_mask */ |
108 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
109 |
|
|
110 |
/* A 8 bit absolute relocation (upper address) */ |
/* A 8 bit absolute relocation (upper address) */ |
111 |
HOWTO (R_M68HC11_LO8, /* type */ |
HOWTO (R_M68HC11_LO8, /* type */ |
112 |
0, /* rightshift */ |
0, /* rightshift */ |
113 |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
114 |
8, /* bitsize */ |
8, /* bitsize */ |
115 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
116 |
0, /* bitpos */ |
0, /* bitpos */ |
117 |
complain_overflow_dont, /* complain_on_overflow */ |
complain_overflow_dont, /* complain_on_overflow */ |
118 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
119 |
"R_M68HC11_LO8", /* name */ |
"R_M68HC11_LO8", /* name */ |
120 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
121 |
0x00ff, /* src_mask */ |
0x00ff, /* src_mask */ |
122 |
0x00ff, /* dst_mask */ |
0x00ff, /* dst_mask */ |
123 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
124 |
|
|
125 |
/* A 8 bit PC-rel relocation */ |
/* A 8 bit PC-rel relocation */ |
126 |
HOWTO (R_M68HC11_PCREL_8, /* type */ |
HOWTO (R_M68HC11_PCREL_8, /* type */ |
127 |
0, /* rightshift */ |
0, /* rightshift */ |
128 |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
129 |
8, /* bitsize */ |
8, /* bitsize */ |
130 |
true, /* pc_relative */ |
TRUE, /* pc_relative */ |
131 |
0, /* bitpos */ |
0, /* bitpos */ |
132 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_bitfield, /* complain_on_overflow */ |
133 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
134 |
"R_M68HC11_PCREL_8", /* name */ |
"R_M68HC11_PCREL_8", /* name */ |
135 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
136 |
0x0, /* src_mask */ |
0x00ff, /* src_mask */ |
137 |
0x00ff, /* dst_mask */ |
0x00ff, /* dst_mask */ |
138 |
false), /* pcrel_offset */ |
TRUE), /* pcrel_offset */ |
139 |
|
|
140 |
/* A 16 bit absolute relocation */ |
/* A 16 bit absolute relocation */ |
141 |
HOWTO (R_M68HC11_16, /* type */ |
HOWTO (R_M68HC11_16, /* type */ |
142 |
0, /* rightshift */ |
0, /* rightshift */ |
143 |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
144 |
16, /* bitsize */ |
16, /* bitsize */ |
145 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
146 |
0, /* bitpos */ |
0, /* bitpos */ |
147 |
complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
148 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
149 |
"R_M68HC11_16", /* name */ |
"R_M68HC11_16", /* name */ |
150 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
151 |
0xffff, /* src_mask */ |
0xffff, /* src_mask */ |
152 |
0xffff, /* dst_mask */ |
0xffff, /* dst_mask */ |
153 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
154 |
|
|
155 |
/* A 32 bit absolute relocation. This one is never used for the |
/* A 32 bit absolute relocation. This one is never used for the |
156 |
code relocation. It's used by gas for -gstabs generation. */ |
code relocation. It's used by gas for -gstabs generation. */ |
158 |
0, /* rightshift */ |
0, /* rightshift */ |
159 |
2, /* size (0 = byte, 1 = short, 2 = long) */ |
2, /* size (0 = byte, 1 = short, 2 = long) */ |
160 |
32, /* bitsize */ |
32, /* bitsize */ |
161 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
162 |
0, /* bitpos */ |
0, /* bitpos */ |
163 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_bitfield, /* complain_on_overflow */ |
164 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
165 |
"R_M68HC11_32", /* name */ |
"R_M68HC11_32", /* name */ |
166 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
167 |
0xffffffff, /* src_mask */ |
0xffffffff, /* src_mask */ |
168 |
0xffffffff, /* dst_mask */ |
0xffffffff, /* dst_mask */ |
169 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
170 |
|
|
171 |
/* A 3 bit absolute relocation */ |
/* A 3 bit absolute relocation */ |
172 |
HOWTO (R_M68HC11_3B, /* type */ |
HOWTO (R_M68HC11_3B, /* type */ |
173 |
0, /* rightshift */ |
0, /* rightshift */ |
174 |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
0, /* size (0 = byte, 1 = short, 2 = long) */ |
175 |
3, /* bitsize */ |
3, /* bitsize */ |
176 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
177 |
0, /* bitpos */ |
0, /* bitpos */ |
178 |
complain_overflow_bitfield, /* complain_on_overflow */ |
complain_overflow_bitfield, /* complain_on_overflow */ |
179 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
180 |
"R_M68HC11_4B", /* name */ |
"R_M68HC11_4B", /* name */ |
181 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
182 |
0x003, /* src_mask */ |
0x003, /* src_mask */ |
183 |
0x003, /* dst_mask */ |
0x003, /* dst_mask */ |
184 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
185 |
|
|
186 |
/* A 16 bit PC-rel relocation */ |
/* A 16 bit PC-rel relocation */ |
187 |
HOWTO (R_M68HC11_PCREL_16, /* type */ |
HOWTO (R_M68HC11_PCREL_16, /* type */ |
188 |
0, /* rightshift */ |
0, /* rightshift */ |
189 |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
190 |
16, /* bitsize */ |
16, /* bitsize */ |
191 |
true, /* pc_relative */ |
TRUE, /* pc_relative */ |
192 |
0, /* bitpos */ |
0, /* bitpos */ |
193 |
complain_overflow_dont, /* complain_on_overflow */ |
complain_overflow_dont, /* complain_on_overflow */ |
194 |
bfd_elf_generic_reloc, /* special_function */ |
bfd_elf_generic_reloc, /* special_function */ |
195 |
"R_M68HC11_PCREL_16", /* name */ |
"R_M68HC11_PCREL_16", /* name */ |
196 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
197 |
0x0, /* src_mask */ |
0xffff, /* src_mask */ |
198 |
0xffff, /* dst_mask */ |
0xffff, /* dst_mask */ |
199 |
false), /* pcrel_offset */ |
TRUE), /* pcrel_offset */ |
200 |
|
|
201 |
/* GNU extension to record C++ vtable hierarchy */ |
/* GNU extension to record C++ vtable hierarchy */ |
202 |
HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
203 |
0, /* rightshift */ |
0, /* rightshift */ |
204 |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
205 |
0, /* bitsize */ |
0, /* bitsize */ |
206 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
207 |
0, /* bitpos */ |
0, /* bitpos */ |
208 |
complain_overflow_dont, /* complain_on_overflow */ |
complain_overflow_dont, /* complain_on_overflow */ |
209 |
NULL, /* special_function */ |
NULL, /* special_function */ |
210 |
"R_M68HC11_GNU_VTINHERIT", /* name */ |
"R_M68HC11_GNU_VTINHERIT", /* name */ |
211 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
212 |
0, /* src_mask */ |
0, /* src_mask */ |
213 |
0, /* dst_mask */ |
0, /* dst_mask */ |
214 |
false), /* pcrel_offset */ |
FALSE), /* pcrel_offset */ |
215 |
|
|
216 |
/* GNU extension to record C++ vtable member usage */ |
/* GNU extension to record C++ vtable member usage */ |
217 |
HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
218 |
0, /* rightshift */ |
0, /* rightshift */ |
219 |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
1, /* size (0 = byte, 1 = short, 2 = long) */ |
220 |
0, /* bitsize */ |
0, /* bitsize */ |
221 |
false, /* pc_relative */ |
FALSE, /* pc_relative */ |
222 |
0, /* bitpos */ |
0, /* bitpos */ |
223 |
complain_overflow_dont, /* complain_on_overflow */ |
complain_overflow_dont, /* complain_on_overflow */ |
224 |
_bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
_bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
225 |
"R_M68HC11_GNU_VTENTRY", /* name */ |
"R_M68HC11_GNU_VTENTRY", /* name */ |
226 |
false, /* partial_inplace */ |
FALSE, /* partial_inplace */ |
227 |
|
0, /* src_mask */ |
228 |
|
0, /* dst_mask */ |
229 |
|
FALSE), /* pcrel_offset */ |
230 |
|
|
231 |
|
/* A 24 bit relocation */ |
232 |
|
HOWTO (R_M68HC11_24, /* type */ |
233 |
|
0, /* rightshift */ |
234 |
|
1, /* size (0 = byte, 1 = short, 2 = long) */ |
235 |
|
24, /* bitsize */ |
236 |
|
FALSE, /* pc_relative */ |
237 |
|
0, /* bitpos */ |
238 |
|
complain_overflow_bitfield, /* complain_on_overflow */ |
239 |
|
bfd_elf_generic_reloc, /* special_function */ |
240 |
|
"R_M68HC11_24", /* name */ |
241 |
|
FALSE, /* partial_inplace */ |
242 |
|
0xffffff, /* src_mask */ |
243 |
|
0xffffff, /* dst_mask */ |
244 |
|
FALSE), /* pcrel_offset */ |
245 |
|
|
246 |
|
/* A 16-bit low relocation */ |
247 |
|
HOWTO (R_M68HC11_LO16, /* type */ |
248 |
|
0, /* rightshift */ |
249 |
|
1, /* size (0 = byte, 1 = short, 2 = long) */ |
250 |
|
16, /* bitsize */ |
251 |
|
FALSE, /* pc_relative */ |
252 |
|
0, /* bitpos */ |
253 |
|
complain_overflow_bitfield, /* complain_on_overflow */ |
254 |
|
bfd_elf_generic_reloc, /* special_function */ |
255 |
|
"R_M68HC11_LO16", /* name */ |
256 |
|
FALSE, /* partial_inplace */ |
257 |
|
0xffff, /* src_mask */ |
258 |
|
0xffff, /* dst_mask */ |
259 |
|
FALSE), /* pcrel_offset */ |
260 |
|
|
261 |
|
/* A page relocation */ |
262 |
|
HOWTO (R_M68HC11_PAGE, /* type */ |
263 |
|
0, /* rightshift */ |
264 |
|
0, /* size (0 = byte, 1 = short, 2 = long) */ |
265 |
|
8, /* bitsize */ |
266 |
|
FALSE, /* pc_relative */ |
267 |
|
0, /* bitpos */ |
268 |
|
complain_overflow_bitfield, /* complain_on_overflow */ |
269 |
|
bfd_elf_generic_reloc, /* special_function */ |
270 |
|
"R_M68HC11_PAGE", /* name */ |
271 |
|
FALSE, /* partial_inplace */ |
272 |
|
0x00ff, /* src_mask */ |
273 |
|
0x00ff, /* dst_mask */ |
274 |
|
FALSE), /* pcrel_offset */ |
275 |
|
|
276 |
|
EMPTY_HOWTO (14), |
277 |
|
EMPTY_HOWTO (15), |
278 |
|
EMPTY_HOWTO (16), |
279 |
|
EMPTY_HOWTO (17), |
280 |
|
EMPTY_HOWTO (18), |
281 |
|
EMPTY_HOWTO (19), |
282 |
|
|
283 |
|
/* Mark beginning of a jump instruction (any form). */ |
284 |
|
HOWTO (R_M68HC11_RL_JUMP, /* type */ |
285 |
|
0, /* rightshift */ |
286 |
|
1, /* size (0 = byte, 1 = short, 2 = long) */ |
287 |
|
0, /* bitsize */ |
288 |
|
FALSE, /* pc_relative */ |
289 |
|
0, /* bitpos */ |
290 |
|
complain_overflow_dont, /* complain_on_overflow */ |
291 |
|
m68hc11_elf_ignore_reloc, /* special_function */ |
292 |
|
"R_M68HC11_RL_JUMP", /* name */ |
293 |
|
TRUE, /* partial_inplace */ |
294 |
0, /* src_mask */ |
0, /* src_mask */ |
295 |
0, /* dst_mask */ |
0, /* dst_mask */ |
296 |
false), /* pcrel_offset */ |
TRUE), /* pcrel_offset */ |
297 |
|
|
298 |
|
/* Mark beginning of Gcc relaxation group instruction. */ |
299 |
|
HOWTO (R_M68HC11_RL_GROUP, /* type */ |
300 |
|
0, /* rightshift */ |
301 |
|
1, /* size (0 = byte, 1 = short, 2 = long) */ |
302 |
|
0, /* bitsize */ |
303 |
|
FALSE, /* pc_relative */ |
304 |
|
0, /* bitpos */ |
305 |
|
complain_overflow_dont, /* complain_on_overflow */ |
306 |
|
m68hc11_elf_ignore_reloc, /* special_function */ |
307 |
|
"R_M68HC11_RL_GROUP", /* name */ |
308 |
|
TRUE, /* partial_inplace */ |
309 |
|
0, /* src_mask */ |
310 |
|
0, /* dst_mask */ |
311 |
|
TRUE), /* pcrel_offset */ |
312 |
}; |
}; |
313 |
|
|
314 |
/* Map BFD reloc types to M68HC11 ELF reloc types. */ |
/* Map BFD reloc types to M68HC11 ELF reloc types. */ |
330 |
{BFD_RELOC_32, R_M68HC11_32}, |
{BFD_RELOC_32, R_M68HC11_32}, |
331 |
{BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
{BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
332 |
|
|
|
/* The following relocs are defined but they probably don't work yet. */ |
|
333 |
{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
334 |
{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
335 |
|
|
336 |
|
{BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16}, |
337 |
|
{BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE}, |
338 |
|
{BFD_RELOC_M68HC11_24, R_M68HC11_24}, |
339 |
|
|
340 |
|
{BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP}, |
341 |
|
{BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP}, |
342 |
}; |
}; |
343 |
|
|
344 |
static reloc_howto_type * |
static reloc_howto_type * |
345 |
bfd_elf32_bfd_reloc_type_lookup (abfd, code) |
bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
346 |
bfd *abfd ATTRIBUTE_UNUSED; |
bfd_reloc_code_real_type code) |
|
bfd_reloc_code_real_type code; |
|
347 |
{ |
{ |
348 |
unsigned int i; |
unsigned int i; |
349 |
|
|
361 |
/* Set the howto pointer for an M68HC11 ELF reloc. */ |
/* Set the howto pointer for an M68HC11 ELF reloc. */ |
362 |
|
|
363 |
static void |
static void |
364 |
m68hc11_info_to_howto_rel (abfd, cache_ptr, dst) |
m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
365 |
bfd *abfd ATTRIBUTE_UNUSED; |
arelent *cache_ptr, Elf_Internal_Rela *dst) |
|
arelent *cache_ptr; |
|
|
Elf32_Internal_Rel *dst; |
|
366 |
{ |
{ |
367 |
unsigned int r_type; |
unsigned int r_type; |
368 |
|
|
371 |
cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
372 |
} |
} |
373 |
|
|
374 |
/* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c. |
|
375 |
The Motorola spec says to use a different Elf machine code. */ |
/* Far trampoline generation. */ |
376 |
|
|
377 |
|
/* Build a 68HC11 trampoline stub. */ |
378 |
|
static bfd_boolean |
379 |
|
m68hc11_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) |
380 |
|
{ |
381 |
|
struct elf32_m68hc11_stub_hash_entry *stub_entry; |
382 |
|
struct bfd_link_info *info; |
383 |
|
struct m68hc11_elf_link_hash_table *htab; |
384 |
|
asection *stub_sec; |
385 |
|
bfd *stub_bfd; |
386 |
|
bfd_byte *loc; |
387 |
|
bfd_vma sym_value, phys_page, phys_addr; |
388 |
|
|
389 |
|
/* Massage our args to the form they really have. */ |
390 |
|
stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
391 |
|
info = (struct bfd_link_info *) in_arg; |
392 |
|
|
393 |
|
htab = m68hc11_elf_hash_table (info); |
394 |
|
|
395 |
|
stub_sec = stub_entry->stub_sec; |
396 |
|
|
397 |
|
/* Make a note of the offset within the stubs for this entry. */ |
398 |
|
stub_entry->stub_offset = stub_sec->size; |
399 |
|
stub_sec->size += 10; |
400 |
|
loc = stub_sec->contents + stub_entry->stub_offset; |
401 |
|
|
402 |
|
stub_bfd = stub_sec->owner; |
403 |
|
|
404 |
|
/* Create the trampoline call stub: |
405 |
|
|
406 |
|
pshb |
407 |
|
ldab #%page(symbol) |
408 |
|
ldy #%addr(symbol) |
409 |
|
jmp __trampoline |
410 |
|
|
411 |
|
*/ |
412 |
|
sym_value = (stub_entry->target_value |
413 |
|
+ stub_entry->target_section->output_offset |
414 |
|
+ stub_entry->target_section->output_section->vma); |
415 |
|
phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value); |
416 |
|
phys_page = m68hc11_phys_page (&htab->pinfo, sym_value); |
417 |
|
|
418 |
|
/* pshb; ldab #%page(sym) */ |
419 |
|
bfd_put_8 (stub_bfd, 0x37, loc); |
420 |
|
bfd_put_8 (stub_bfd, 0xC6, loc + 1); |
421 |
|
bfd_put_8 (stub_bfd, phys_page, loc + 2); |
422 |
|
loc += 3; |
423 |
|
|
424 |
|
/* ldy #%addr(sym) */ |
425 |
|
bfd_put_8 (stub_bfd, 0x18, loc); |
426 |
|
bfd_put_8 (stub_bfd, 0xCE, loc + 1); |
427 |
|
bfd_put_16 (stub_bfd, phys_addr, loc + 2); |
428 |
|
loc += 4; |
429 |
|
|
430 |
|
/* jmp __trampoline */ |
431 |
|
bfd_put_8 (stub_bfd, 0x7E, loc); |
432 |
|
bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1); |
433 |
|
|
434 |
|
return TRUE; |
435 |
|
} |
436 |
|
|
437 |
|
/* As above, but don't actually build the stub. Just bump offset so |
438 |
|
we know stub section sizes. */ |
439 |
|
|
440 |
|
static bfd_boolean |
441 |
|
m68hc11_elf_size_one_stub (struct bfd_hash_entry *gen_entry, |
442 |
|
void *in_arg ATTRIBUTE_UNUSED) |
443 |
|
{ |
444 |
|
struct elf32_m68hc11_stub_hash_entry *stub_entry; |
445 |
|
|
446 |
|
/* Massage our args to the form they really have. */ |
447 |
|
stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
448 |
|
|
449 |
|
stub_entry->stub_sec->size += 10; |
450 |
|
return TRUE; |
451 |
|
} |
452 |
|
|
453 |
|
/* Create a 68HC11 ELF linker hash table. */ |
454 |
|
|
455 |
|
static struct bfd_link_hash_table * |
456 |
|
m68hc11_elf_bfd_link_hash_table_create (bfd *abfd) |
457 |
|
{ |
458 |
|
struct m68hc11_elf_link_hash_table *ret; |
459 |
|
|
460 |
|
ret = m68hc11_elf_hash_table_create (abfd); |
461 |
|
if (ret == (struct m68hc11_elf_link_hash_table *) NULL) |
462 |
|
return NULL; |
463 |
|
|
464 |
|
ret->size_one_stub = m68hc11_elf_size_one_stub; |
465 |
|
ret->build_one_stub = m68hc11_elf_build_one_stub; |
466 |
|
|
467 |
|
return &ret->root.root; |
468 |
|
} |
469 |
|
|
470 |
|
|
471 |
|
/* 68HC11 Linker Relaxation. */ |
472 |
|
|
473 |
|
struct m68hc11_direct_relax |
474 |
|
{ |
475 |
|
const char *name; |
476 |
|
unsigned char code; |
477 |
|
unsigned char direct_code; |
478 |
|
} m68hc11_direct_relax_table[] = { |
479 |
|
{ "adca", 0xB9, 0x99 }, |
480 |
|
{ "adcb", 0xF9, 0xD9 }, |
481 |
|
{ "adda", 0xBB, 0x9B }, |
482 |
|
{ "addb", 0xFB, 0xDB }, |
483 |
|
{ "addd", 0xF3, 0xD3 }, |
484 |
|
{ "anda", 0xB4, 0x94 }, |
485 |
|
{ "andb", 0xF4, 0xD4 }, |
486 |
|
{ "cmpa", 0xB1, 0x91 }, |
487 |
|
{ "cmpb", 0xF1, 0xD1 }, |
488 |
|
{ "cpd", 0xB3, 0x93 }, |
489 |
|
{ "cpxy", 0xBC, 0x9C }, |
490 |
|
/* { "cpy", 0xBC, 0x9C }, */ |
491 |
|
{ "eora", 0xB8, 0x98 }, |
492 |
|
{ "eorb", 0xF8, 0xD8 }, |
493 |
|
{ "jsr", 0xBD, 0x9D }, |
494 |
|
{ "ldaa", 0xB6, 0x96 }, |
495 |
|
{ "ldab", 0xF6, 0xD6 }, |
496 |
|
{ "ldd", 0xFC, 0xDC }, |
497 |
|
{ "lds", 0xBE, 0x9E }, |
498 |
|
{ "ldxy", 0xFE, 0xDE }, |
499 |
|
/* { "ldy", 0xFE, 0xDE },*/ |
500 |
|
{ "oraa", 0xBA, 0x9A }, |
501 |
|
{ "orab", 0xFA, 0xDA }, |
502 |
|
{ "sbca", 0xB2, 0x92 }, |
503 |
|
{ "sbcb", 0xF2, 0xD2 }, |
504 |
|
{ "staa", 0xB7, 0x97 }, |
505 |
|
{ "stab", 0xF7, 0xD7 }, |
506 |
|
{ "std", 0xFD, 0xDD }, |
507 |
|
{ "sts", 0xBF, 0x9F }, |
508 |
|
{ "stxy", 0xFF, 0xDF }, |
509 |
|
/* { "sty", 0xFF, 0xDF },*/ |
510 |
|
{ "suba", 0xB0, 0x90 }, |
511 |
|
{ "subb", 0xF0, 0xD0 }, |
512 |
|
{ "subd", 0xB3, 0x93 }, |
513 |
|
{ 0, 0, 0 } |
514 |
|
}; |
515 |
|
|
516 |
|
static struct m68hc11_direct_relax * |
517 |
|
find_relaxable_insn (unsigned char code) |
518 |
|
{ |
519 |
|
int i; |
520 |
|
|
521 |
|
for (i = 0; m68hc11_direct_relax_table[i].name; i++) |
522 |
|
if (m68hc11_direct_relax_table[i].code == code) |
523 |
|
return &m68hc11_direct_relax_table[i]; |
524 |
|
|
525 |
|
return 0; |
526 |
|
} |
527 |
|
|
528 |
|
static int |
529 |
|
compare_reloc (const void *e1, const void *e2) |
530 |
|
{ |
531 |
|
const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1; |
532 |
|
const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2; |
533 |
|
|
534 |
|
if (i1->r_offset == i2->r_offset) |
535 |
|
return 0; |
536 |
|
else |
537 |
|
return i1->r_offset < i2->r_offset ? -1 : 1; |
538 |
|
} |
539 |
|
|
540 |
|
#define M6811_OP_LDX_IMMEDIATE (0xCE) |
541 |
|
|
542 |
|
static void |
543 |
|
m68hc11_relax_group (bfd *abfd, asection *sec, bfd_byte *contents, |
544 |
|
unsigned value, unsigned long offset, |
545 |
|
unsigned long end_group) |
546 |
|
{ |
547 |
|
unsigned char code; |
548 |
|
unsigned long start_offset; |
549 |
|
unsigned long ldx_offset = offset; |
550 |
|
unsigned long ldx_size; |
551 |
|
int can_delete_ldx; |
552 |
|
int relax_ldy = 0; |
553 |
|
|
554 |
|
/* First instruction of the relax group must be a |
555 |
|
LDX #value or LDY #value. If this is not the case, |
556 |
|
ignore the relax group. */ |
557 |
|
code = bfd_get_8 (abfd, contents + offset); |
558 |
|
if (code == 0x18) |
559 |
|
{ |
560 |
|
relax_ldy++; |
561 |
|
offset++; |
562 |
|
code = bfd_get_8 (abfd, contents + offset); |
563 |
|
} |
564 |
|
ldx_size = offset - ldx_offset + 3; |
565 |
|
offset += 3; |
566 |
|
if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group) |
567 |
|
return; |
568 |
|
|
569 |
|
|
570 |
|
/* We can remove the LDX/LDY only when all bset/brclr instructions |
571 |
|
of the relax group have been converted to use direct addressing |
572 |
|
mode. */ |
573 |
|
can_delete_ldx = 1; |
574 |
|
while (offset < end_group) |
575 |
|
{ |
576 |
|
unsigned isize; |
577 |
|
unsigned new_value; |
578 |
|
int bset_use_y; |
579 |
|
|
580 |
|
bset_use_y = 0; |
581 |
|
start_offset = offset; |
582 |
|
code = bfd_get_8 (abfd, contents + offset); |
583 |
|
if (code == 0x18) |
584 |
|
{ |
585 |
|
bset_use_y++; |
586 |
|
offset++; |
587 |
|
code = bfd_get_8 (abfd, contents + offset); |
588 |
|
} |
589 |
|
|
590 |
|
/* Check the instruction and translate to use direct addressing mode. */ |
591 |
|
switch (code) |
592 |
|
{ |
593 |
|
/* bset */ |
594 |
|
case 0x1C: |
595 |
|
code = 0x14; |
596 |
|
isize = 3; |
597 |
|
break; |
598 |
|
|
599 |
|
/* brclr */ |
600 |
|
case 0x1F: |
601 |
|
code = 0x13; |
602 |
|
isize = 4; |
603 |
|
break; |
604 |
|
|
605 |
|
/* brset */ |
606 |
|
case 0x1E: |
607 |
|
code = 0x12; |
608 |
|
isize = 4; |
609 |
|
break; |
610 |
|
|
611 |
|
/* bclr */ |
612 |
|
case 0x1D: |
613 |
|
code = 0x15; |
614 |
|
isize = 3; |
615 |
|
break; |
616 |
|
|
617 |
|
/* This instruction is not recognized and we are not |
618 |
|
at end of the relax group. Ignore and don't remove |
619 |
|
the first LDX (we don't know what it is used for...). */ |
620 |
|
default: |
621 |
|
return; |
622 |
|
} |
623 |
|
new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1); |
624 |
|
new_value += value; |
625 |
|
if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy) |
626 |
|
{ |
627 |
|
bfd_put_8 (abfd, code, contents + offset); |
628 |
|
bfd_put_8 (abfd, new_value, contents + offset + 1); |
629 |
|
if (start_offset != offset) |
630 |
|
{ |
631 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset, |
632 |
|
offset - start_offset); |
633 |
|
end_group--; |
634 |
|
} |
635 |
|
} |
636 |
|
else |
637 |
|
{ |
638 |
|
can_delete_ldx = 0; |
639 |
|
} |
640 |
|
offset = start_offset + isize; |
641 |
|
} |
642 |
|
if (can_delete_ldx) |
643 |
|
{ |
644 |
|
/* Remove the move instruction (3 or 4 bytes win). */ |
645 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size); |
646 |
|
} |
647 |
|
} |
648 |
|
|
649 |
|
/* This function handles relaxing for the 68HC11. |
650 |
|
|
651 |
|
|
652 |
|
and somewhat more difficult to support. */ |
653 |
|
|
654 |
|
static bfd_boolean |
655 |
|
m68hc11_elf_relax_section (bfd *abfd, asection *sec, |
656 |
|
struct bfd_link_info *link_info, bfd_boolean *again) |
657 |
|
{ |
658 |
|
Elf_Internal_Shdr *symtab_hdr; |
659 |
|
Elf_Internal_Shdr *shndx_hdr; |
660 |
|
Elf_Internal_Rela *internal_relocs; |
661 |
|
Elf_Internal_Rela *free_relocs = NULL; |
662 |
|
Elf_Internal_Rela *irel, *irelend; |
663 |
|
bfd_byte *contents = NULL; |
664 |
|
bfd_byte *free_contents = NULL; |
665 |
|
Elf32_External_Sym *free_extsyms = NULL; |
666 |
|
Elf_Internal_Rela *prev_insn_branch = NULL; |
667 |
|
Elf_Internal_Rela *prev_insn_group = NULL; |
668 |
|
unsigned insn_group_value = 0; |
669 |
|
Elf_Internal_Sym *isymbuf = NULL; |
670 |
|
|
671 |
|
/* Assume nothing changes. */ |
672 |
|
*again = FALSE; |
673 |
|
|
674 |
|
/* We don't have to do anything for a relocatable link, if |
675 |
|
this section does not have relocs, or if this is not a |
676 |
|
code section. */ |
677 |
|
if (link_info->relocatable |
678 |
|
|| (sec->flags & SEC_RELOC) == 0 |
679 |
|
|| sec->reloc_count == 0 |
680 |
|
|| (sec->flags & SEC_CODE) == 0) |
681 |
|
return TRUE; |
682 |
|
|
683 |
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
684 |
|
shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
685 |
|
|
686 |
|
/* Get a copy of the native relocations. */ |
687 |
|
internal_relocs = (_bfd_elf_link_read_relocs |
688 |
|
(abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
689 |
|
link_info->keep_memory)); |
690 |
|
if (internal_relocs == NULL) |
691 |
|
goto error_return; |
692 |
|
if (! link_info->keep_memory) |
693 |
|
free_relocs = internal_relocs; |
694 |
|
|
695 |
|
/* Checking for branch relaxation relies on the relocations to |
696 |
|
be sorted on 'r_offset'. This is not guaranteed so we must sort. */ |
697 |
|
qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), |
698 |
|
compare_reloc); |
699 |
|
|
700 |
|
/* Walk through them looking for relaxing opportunities. */ |
701 |
|
irelend = internal_relocs + sec->reloc_count; |
702 |
|
for (irel = internal_relocs; irel < irelend; irel++) |
703 |
|
{ |
704 |
|
bfd_vma symval; |
705 |
|
bfd_vma value; |
706 |
|
Elf_Internal_Sym *isym; |
707 |
|
asection *sym_sec; |
708 |
|
int is_far = 0; |
709 |
|
|
710 |
|
/* If this isn't something that can be relaxed, then ignore |
711 |
|
this reloc. */ |
712 |
|
if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16 |
713 |
|
&& ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP |
714 |
|
&& ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP) |
715 |
|
{ |
716 |
|
prev_insn_branch = 0; |
717 |
|
prev_insn_group = 0; |
718 |
|
continue; |
719 |
|
} |
720 |
|
|
721 |
|
/* Get the section contents if we haven't done so already. */ |
722 |
|
if (contents == NULL) |
723 |
|
{ |
724 |
|
/* Get cached copy if it exists. */ |
725 |
|
if (elf_section_data (sec)->this_hdr.contents != NULL) |
726 |
|
contents = elf_section_data (sec)->this_hdr.contents; |
727 |
|
else |
728 |
|
{ |
729 |
|
/* Go get them off disk. */ |
730 |
|
if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
731 |
|
goto error_return; |
732 |
|
} |
733 |
|
} |
734 |
|
|
735 |
|
/* Try to eliminate an unconditional 8 bit pc-relative branch |
736 |
|
which immediately follows a conditional 8 bit pc-relative |
737 |
|
branch around the unconditional branch. |
738 |
|
|
739 |
|
original: new: |
740 |
|
bCC lab1 bCC' lab2 |
741 |
|
bra lab2 |
742 |
|
lab1: lab1: |
743 |
|
|
744 |
|
This happens when the bCC can't reach lab2 at assembly time, |
745 |
|
but due to other relaxations it can reach at link time. */ |
746 |
|
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP) |
747 |
|
{ |
748 |
|
Elf_Internal_Rela *nrel; |
749 |
|
unsigned char code; |
750 |
|
unsigned char roffset; |
751 |
|
|
752 |
|
prev_insn_branch = 0; |
753 |
|
prev_insn_group = 0; |
754 |
|
|
755 |
|
/* Do nothing if this reloc is the last byte in the section. */ |
756 |
|
if (irel->r_offset + 2 >= sec->size) |
757 |
|
continue; |
758 |
|
|
759 |
|
/* See if the next instruction is an unconditional pc-relative |
760 |
|
branch, more often than not this test will fail, so we |
761 |
|
test it first to speed things up. */ |
762 |
|
code = bfd_get_8 (abfd, contents + irel->r_offset + 2); |
763 |
|
if (code != 0x7e) |
764 |
|
continue; |
765 |
|
|
766 |
|
/* Also make sure the next relocation applies to the next |
767 |
|
instruction and that it's a pc-relative 8 bit branch. */ |
768 |
|
nrel = irel + 1; |
769 |
|
if (nrel == irelend |
770 |
|
|| irel->r_offset + 3 != nrel->r_offset |
771 |
|
|| ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16) |
772 |
|
continue; |
773 |
|
|
774 |
|
/* Make sure our destination immediately follows the |
775 |
|
unconditional branch. */ |
776 |
|
roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
777 |
|
if (roffset != 3) |
778 |
|
continue; |
779 |
|
|
780 |
|
prev_insn_branch = irel; |
781 |
|
prev_insn_group = 0; |
782 |
|
continue; |
783 |
|
} |
784 |
|
|
785 |
|
/* Read this BFD's symbols if we haven't done so already. */ |
786 |
|
if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
787 |
|
{ |
788 |
|
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
789 |
|
if (isymbuf == NULL) |
790 |
|
isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
791 |
|
symtab_hdr->sh_info, 0, |
792 |
|
NULL, NULL, NULL); |
793 |
|
if (isymbuf == NULL) |
794 |
|
goto error_return; |
795 |
|
} |
796 |
|
|
797 |
|
/* Get the value of the symbol referred to by the reloc. */ |
798 |
|
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
799 |
|
{ |
800 |
|
/* A local symbol. */ |
801 |
|
isym = isymbuf + ELF32_R_SYM (irel->r_info); |
802 |
|
is_far = isym->st_other & STO_M68HC12_FAR; |
803 |
|
sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
804 |
|
symval = (isym->st_value |
805 |
|
+ sym_sec->output_section->vma |
806 |
|
+ sym_sec->output_offset); |
807 |
|
} |
808 |
|
else |
809 |
|
{ |
810 |
|
unsigned long indx; |
811 |
|
struct elf_link_hash_entry *h; |
812 |
|
|
813 |
|
/* An external symbol. */ |
814 |
|
indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
815 |
|
h = elf_sym_hashes (abfd)[indx]; |
816 |
|
BFD_ASSERT (h != NULL); |
817 |
|
if (h->root.type != bfd_link_hash_defined |
818 |
|
&& h->root.type != bfd_link_hash_defweak) |
819 |
|
{ |
820 |
|
/* This appears to be a reference to an undefined |
821 |
|
symbol. Just ignore it--it will be caught by the |
822 |
|
regular reloc processing. */ |
823 |
|
prev_insn_branch = 0; |
824 |
|
prev_insn_group = 0; |
825 |
|
continue; |
826 |
|
} |
827 |
|
|
828 |
|
is_far = h->other & STO_M68HC12_FAR; |
829 |
|
isym = 0; |
830 |
|
sym_sec = h->root.u.def.section; |
831 |
|
symval = (h->root.u.def.value |
832 |
|
+ sym_sec->output_section->vma |
833 |
|
+ sym_sec->output_offset); |
834 |
|
} |
835 |
|
|
836 |
|
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP) |
837 |
|
{ |
838 |
|
prev_insn_branch = 0; |
839 |
|
prev_insn_group = 0; |
840 |
|
|
841 |
|
/* Do nothing if this reloc is the last byte in the section. */ |
842 |
|
if (irel->r_offset == sec->size) |
843 |
|
continue; |
844 |
|
|
845 |
|
prev_insn_group = irel; |
846 |
|
insn_group_value = isym->st_value; |
847 |
|
continue; |
848 |
|
} |
849 |
|
|
850 |
|
/* When we relax some bytes, the size of our section changes. |
851 |
|
This affects the layout of next input sections that go in our |
852 |
|
output section. When the symbol is part of another section that |
853 |
|
will go in the same output section as the current one, it's |
854 |
|
final address may now be incorrect (too far). We must let the |
855 |
|
linker re-compute all section offsets before processing this |
856 |
|
reloc. Code example: |
857 |
|
|
858 |
|
Initial Final |
859 |
|
.sect .text section size = 6 section size = 4 |
860 |
|
jmp foo |
861 |
|
jmp bar |
862 |
|
.sect .text.foo_bar output_offset = 6 output_offset = 4 |
863 |
|
foo: rts |
864 |
|
bar: rts |
865 |
|
|
866 |
|
If we process the reloc now, the jmp bar is replaced by a |
867 |
|
relative branch to the initial bar address (output_offset 6). */ |
868 |
|
if (*again && sym_sec != sec |
869 |
|
&& sym_sec->output_section == sec->output_section) |
870 |
|
{ |
871 |
|
prev_insn_group = 0; |
872 |
|
prev_insn_branch = 0; |
873 |
|
continue; |
874 |
|
} |
875 |
|
|
876 |
|
value = symval; |
877 |
|
/* Try to turn a far branch to a near branch. */ |
878 |
|
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 |
879 |
|
&& prev_insn_branch) |
880 |
|
{ |
881 |
|
bfd_vma offset; |
882 |
|
unsigned char code; |
883 |
|
|
884 |
|
offset = value - (prev_insn_branch->r_offset |
885 |
|
+ sec->output_section->vma |
886 |
|
+ sec->output_offset + 2); |
887 |
|
|
888 |
|
/* If the offset is still out of -128..+127 range, |
889 |
|
leave that far branch unchanged. */ |
890 |
|
if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80) |
891 |
|
{ |
892 |
|
prev_insn_branch = 0; |
893 |
|
continue; |
894 |
|
} |
895 |
|
|
896 |
|
/* Shrink the branch. */ |
897 |
|
code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset); |
898 |
|
if (code == 0x7e) |
899 |
|
{ |
900 |
|
code = 0x20; |
901 |
|
bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); |
902 |
|
bfd_put_8 (abfd, 0xff, |
903 |
|
contents + prev_insn_branch->r_offset + 1); |
904 |
|
irel->r_offset = prev_insn_branch->r_offset + 1; |
905 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
906 |
|
R_M68HC11_PCREL_8); |
907 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, |
908 |
|
irel->r_offset + 1, 1); |
909 |
|
} |
910 |
|
else |
911 |
|
{ |
912 |
|
code ^= 0x1; |
913 |
|
bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); |
914 |
|
bfd_put_8 (abfd, 0xff, |
915 |
|
contents + prev_insn_branch->r_offset + 1); |
916 |
|
irel->r_offset = prev_insn_branch->r_offset + 1; |
917 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
918 |
|
R_M68HC11_PCREL_8); |
919 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, |
920 |
|
irel->r_offset + 1, 3); |
921 |
|
} |
922 |
|
prev_insn_branch = 0; |
923 |
|
*again = TRUE; |
924 |
|
} |
925 |
|
|
926 |
|
/* Try to turn a 16 bit address into a 8 bit page0 address. */ |
927 |
|
else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 |
928 |
|
&& (value & 0xff00) == 0) |
929 |
|
{ |
930 |
|
unsigned char code; |
931 |
|
unsigned short offset; |
932 |
|
struct m68hc11_direct_relax *rinfo; |
933 |
|
|
934 |
|
prev_insn_branch = 0; |
935 |
|
offset = bfd_get_16 (abfd, contents + irel->r_offset); |
936 |
|
offset += value; |
937 |
|
if ((offset & 0xff00) != 0) |
938 |
|
{ |
939 |
|
prev_insn_group = 0; |
940 |
|
continue; |
941 |
|
} |
942 |
|
|
943 |
|
if (prev_insn_group) |
944 |
|
{ |
945 |
|
unsigned long old_sec_size = sec->size; |
946 |
|
|
947 |
|
/* Note that we've changed the relocation contents, etc. */ |
948 |
|
elf_section_data (sec)->relocs = internal_relocs; |
949 |
|
free_relocs = NULL; |
950 |
|
|
951 |
|
elf_section_data (sec)->this_hdr.contents = contents; |
952 |
|
free_contents = NULL; |
953 |
|
|
954 |
|
symtab_hdr->contents = (bfd_byte *) isymbuf; |
955 |
|
free_extsyms = NULL; |
956 |
|
|
957 |
|
m68hc11_relax_group (abfd, sec, contents, offset, |
958 |
|
prev_insn_group->r_offset, |
959 |
|
insn_group_value); |
960 |
|
irel = prev_insn_group; |
961 |
|
prev_insn_group = 0; |
962 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
963 |
|
R_M68HC11_NONE); |
964 |
|
if (sec->size != old_sec_size) |
965 |
|
*again = TRUE; |
966 |
|
continue; |
967 |
|
} |
968 |
|
|
969 |
|
/* Get the opcode. */ |
970 |
|
code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
971 |
|
rinfo = find_relaxable_insn (code); |
972 |
|
if (rinfo == 0) |
973 |
|
{ |
974 |
|
prev_insn_group = 0; |
975 |
|
continue; |
976 |
|
} |
977 |
|
|
978 |
|
/* Note that we've changed the relocation contents, etc. */ |
979 |
|
elf_section_data (sec)->relocs = internal_relocs; |
980 |
|
free_relocs = NULL; |
981 |
|
|
982 |
|
elf_section_data (sec)->this_hdr.contents = contents; |
983 |
|
free_contents = NULL; |
984 |
|
|
985 |
|
symtab_hdr->contents = (bfd_byte *) isymbuf; |
986 |
|
free_extsyms = NULL; |
987 |
|
|
988 |
|
/* Fix the opcode. */ |
989 |
|
/* printf ("A relaxable case : 0x%02x (%s)\n", |
990 |
|
code, rinfo->name); */ |
991 |
|
bfd_put_8 (abfd, rinfo->direct_code, |
992 |
|
contents + irel->r_offset - 1); |
993 |
|
|
994 |
|
/* Delete one byte of data (upper byte of address). */ |
995 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1); |
996 |
|
|
997 |
|
/* Fix the relocation's type. */ |
998 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
999 |
|
R_M68HC11_8); |
1000 |
|
|
1001 |
|
/* That will change things, so, we should relax again. */ |
1002 |
|
*again = TRUE; |
1003 |
|
} |
1004 |
|
else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16 && !is_far) |
1005 |
|
{ |
1006 |
|
unsigned char code; |
1007 |
|
bfd_vma offset; |
1008 |
|
|
1009 |
|
prev_insn_branch = 0; |
1010 |
|
code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
1011 |
|
if (code == 0x7e || code == 0xbd) |
1012 |
|
{ |
1013 |
|
offset = value - (irel->r_offset |
1014 |
|
+ sec->output_section->vma |
1015 |
|
+ sec->output_offset + 1); |
1016 |
|
offset += bfd_get_16 (abfd, contents + irel->r_offset); |
1017 |
|
|
1018 |
|
/* If the offset is still out of -128..+127 range, |
1019 |
|
leave that far branch unchanged. */ |
1020 |
|
if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80) |
1021 |
|
{ |
1022 |
|
|
1023 |
|
/* Note that we've changed the relocation contents, etc. */ |
1024 |
|
elf_section_data (sec)->relocs = internal_relocs; |
1025 |
|
free_relocs = NULL; |
1026 |
|
|
1027 |
|
elf_section_data (sec)->this_hdr.contents = contents; |
1028 |
|
free_contents = NULL; |
1029 |
|
|
1030 |
|
symtab_hdr->contents = (bfd_byte *) isymbuf; |
1031 |
|
free_extsyms = NULL; |
1032 |
|
|
1033 |
|
/* Shrink the branch. */ |
1034 |
|
code = (code == 0x7e) ? 0x20 : 0x8d; |
1035 |
|
bfd_put_8 (abfd, code, |
1036 |
|
contents + irel->r_offset - 1); |
1037 |
|
bfd_put_8 (abfd, 0xff, |
1038 |
|
contents + irel->r_offset); |
1039 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
1040 |
|
R_M68HC11_PCREL_8); |
1041 |
|
m68hc11_elf_relax_delete_bytes (abfd, sec, |
1042 |
|
irel->r_offset + 1, 1); |
1043 |
|
/* That will change things, so, we should relax again. */ |
1044 |
|
*again = TRUE; |
1045 |
|
} |
1046 |
|
} |
1047 |
|
} |
1048 |
|
prev_insn_branch = 0; |
1049 |
|
prev_insn_group = 0; |
1050 |
|
} |
1051 |
|
|
1052 |
|
if (free_relocs != NULL) |
1053 |
|
{ |
1054 |
|
free (free_relocs); |
1055 |
|
free_relocs = NULL; |
1056 |
|
} |
1057 |
|
|
1058 |
|
if (free_contents != NULL) |
1059 |
|
{ |
1060 |
|
if (! link_info->keep_memory) |
1061 |
|
free (free_contents); |
1062 |
|
else |
1063 |
|
{ |
1064 |
|
/* Cache the section contents for elf_link_input_bfd. */ |
1065 |
|
elf_section_data (sec)->this_hdr.contents = contents; |
1066 |
|
} |
1067 |
|
free_contents = NULL; |
1068 |
|
} |
1069 |
|
|
1070 |
|
if (free_extsyms != NULL) |
1071 |
|
{ |
1072 |
|
if (! link_info->keep_memory) |
1073 |
|
free (free_extsyms); |
1074 |
|
else |
1075 |
|
{ |
1076 |
|
/* Cache the symbols for elf_link_input_bfd. */ |
1077 |
|
symtab_hdr->contents = (unsigned char *) isymbuf; |
1078 |
|
} |
1079 |
|
free_extsyms = NULL; |
1080 |
|
} |
1081 |
|
|
1082 |
|
return TRUE; |
1083 |
|
|
1084 |
|
error_return: |
1085 |
|
if (free_relocs != NULL) |
1086 |
|
free (free_relocs); |
1087 |
|
if (free_contents != NULL) |
1088 |
|
free (free_contents); |
1089 |
|
if (free_extsyms != NULL) |
1090 |
|
free (free_extsyms); |
1091 |
|
return FALSE; |
1092 |
|
} |
1093 |
|
|
1094 |
|
/* Delete some bytes from a section while relaxing. */ |
1095 |
|
|
1096 |
|
static void |
1097 |
|
m68hc11_elf_relax_delete_bytes (bfd *abfd, asection *sec, |
1098 |
|
bfd_vma addr, int count) |
1099 |
|
{ |
1100 |
|
Elf_Internal_Shdr *symtab_hdr; |
1101 |
|
unsigned int sec_shndx; |
1102 |
|
bfd_byte *contents; |
1103 |
|
Elf_Internal_Rela *irel, *irelend; |
1104 |
|
bfd_vma toaddr; |
1105 |
|
Elf_Internal_Sym *isymbuf, *isym, *isymend; |
1106 |
|
struct elf_link_hash_entry **sym_hashes; |
1107 |
|
struct elf_link_hash_entry **end_hashes; |
1108 |
|
unsigned int symcount; |
1109 |
|
|
1110 |
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
1111 |
|
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
1112 |
|
|
1113 |
|
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
1114 |
|
|
1115 |
|
contents = elf_section_data (sec)->this_hdr.contents; |
1116 |
|
|
1117 |
|
toaddr = sec->size; |
1118 |
|
|
1119 |
|
irel = elf_section_data (sec)->relocs; |
1120 |
|
irelend = irel + sec->reloc_count; |
1121 |
|
|
1122 |
|
/* Actually delete the bytes. */ |
1123 |
|
memmove (contents + addr, contents + addr + count, |
1124 |
|
(size_t) (toaddr - addr - count)); |
1125 |
|
|
1126 |
|
sec->size -= count; |
1127 |
|
|
1128 |
|
/* Adjust all the relocs. */ |
1129 |
|
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
1130 |
|
{ |
1131 |
|
unsigned char code; |
1132 |
|
unsigned char offset; |
1133 |
|
unsigned short raddr; |
1134 |
|
unsigned long old_offset; |
1135 |
|
int branch_pos; |
1136 |
|
|
1137 |
|
old_offset = irel->r_offset; |
1138 |
|
|
1139 |
|
/* See if this reloc was for the bytes we have deleted, in which |
1140 |
|
case we no longer care about it. Don't delete relocs which |
1141 |
|
represent addresses, though. */ |
1142 |
|
if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP |
1143 |
|
&& irel->r_offset >= addr && irel->r_offset < addr + count) |
1144 |
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
1145 |
|
R_M68HC11_NONE); |
1146 |
|
|
1147 |
|
if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE) |
1148 |
|
continue; |
1149 |
|
|
1150 |
|
/* Get the new reloc address. */ |
1151 |
|
if ((irel->r_offset > addr |
1152 |
|
&& irel->r_offset < toaddr)) |
1153 |
|
irel->r_offset -= count; |
1154 |
|
|
1155 |
|
/* If this is a PC relative reloc, see if the range it covers |
1156 |
|
includes the bytes we have deleted. */ |
1157 |
|
switch (ELF32_R_TYPE (irel->r_info)) |
1158 |
|
{ |
1159 |
|
default: |
1160 |
|
break; |
1161 |
|
|
1162 |
|
case R_M68HC11_RL_JUMP: |
1163 |
|
code = bfd_get_8 (abfd, contents + irel->r_offset); |
1164 |
|
switch (code) |
1165 |
|
{ |
1166 |
|
/* jsr and jmp instruction are also marked with RL_JUMP |
1167 |
|
relocs but no adjustment must be made. */ |
1168 |
|
case 0x7e: |
1169 |
|
case 0x9d: |
1170 |
|
case 0xbd: |
1171 |
|
continue; |
1172 |
|
|
1173 |
|
case 0x12: |
1174 |
|
case 0x13: |
1175 |
|
branch_pos = 3; |
1176 |
|
raddr = 4; |
1177 |
|
|
1178 |
|
/* Special case when we translate a brclr N,y into brclr *<addr> |
1179 |
|
In this case, the 0x18 page2 prefix is removed. |
1180 |
|
The reloc offset is not modified but the instruction |
1181 |
|
size is reduced by 1. */ |
1182 |
|
if (old_offset == addr) |
1183 |
|
raddr++; |
1184 |
|
break; |
1185 |
|
|
1186 |
|
case 0x1e: |
1187 |
|
case 0x1f: |
1188 |
|
branch_pos = 3; |
1189 |
|
raddr = 4; |
1190 |
|
break; |
1191 |
|
|
1192 |
|
case 0x18: |
1193 |
|
branch_pos = 4; |
1194 |
|
raddr = 5; |
1195 |
|
break; |
1196 |
|
|
1197 |
|
default: |
1198 |
|
branch_pos = 1; |
1199 |
|
raddr = 2; |
1200 |
|
break; |
1201 |
|
} |
1202 |
|
offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos); |
1203 |
|
raddr += old_offset; |
1204 |
|
raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0)); |
1205 |
|
if (irel->r_offset < addr && raddr > addr) |
1206 |
|
{ |
1207 |
|
offset -= count; |
1208 |
|
bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); |
1209 |
|
} |
1210 |
|
else if (irel->r_offset >= addr && raddr <= addr) |
1211 |
|
{ |
1212 |
|
offset += count; |
1213 |
|
bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); |
1214 |
|
} |
1215 |
|
else |
1216 |
|
{ |
1217 |
|
/*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr, |
1218 |
|
irel->r_offset, addr);*/ |
1219 |
|
} |
1220 |
|
|
1221 |
|
break; |
1222 |
|
} |
1223 |
|
} |
1224 |
|
|
1225 |
|
/* Adjust the local symbols defined in this section. */ |
1226 |
|
isymend = isymbuf + symtab_hdr->sh_info; |
1227 |
|
for (isym = isymbuf; isym < isymend; isym++) |
1228 |
|
{ |
1229 |
|
if (isym->st_shndx == sec_shndx |
1230 |
|
&& isym->st_value > addr |
1231 |
|
&& isym->st_value <= toaddr) |
1232 |
|
isym->st_value -= count; |
1233 |
|
} |
1234 |
|
|
1235 |
|
/* Now adjust the global symbols defined in this section. */ |
1236 |
|
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
1237 |
|
- symtab_hdr->sh_info); |
1238 |
|
sym_hashes = elf_sym_hashes (abfd); |
1239 |
|
end_hashes = sym_hashes + symcount; |
1240 |
|
for (; sym_hashes < end_hashes; sym_hashes++) |
1241 |
|
{ |
1242 |
|
struct elf_link_hash_entry *sym_hash = *sym_hashes; |
1243 |
|
if ((sym_hash->root.type == bfd_link_hash_defined |
1244 |
|
|| sym_hash->root.type == bfd_link_hash_defweak) |
1245 |
|
&& sym_hash->root.u.def.section == sec |
1246 |
|
&& sym_hash->root.u.def.value > addr |
1247 |
|
&& sym_hash->root.u.def.value <= toaddr) |
1248 |
|
{ |
1249 |
|
sym_hash->root.u.def.value -= count; |
1250 |
|
} |
1251 |
|
} |
1252 |
|
} |
1253 |
|
|
1254 |
|
/* Specific sections: |
1255 |
|
- The .page0 is a data section that is mapped in [0x0000..0x00FF]. |
1256 |
|
Page0 accesses are faster on the M68HC11. Soft registers used by GCC-m6811 |
1257 |
|
are located in .page0. |
1258 |
|
- The .vectors is the section that represents the interrupt |
1259 |
|
vectors. */ |
1260 |
|
static struct bfd_elf_special_section const elf32_m68hc11_special_sections[]= |
1261 |
|
{ |
1262 |
|
{ ".eeprom", 7, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
1263 |
|
{ ".softregs", 9, 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, |
1264 |
|
{ ".page0", 6, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
1265 |
|
{ ".vectors", 8, 0, SHT_PROGBITS, SHF_ALLOC }, |
1266 |
|
{ NULL, 0, 0, 0, 0 } |
1267 |
|
}; |
1268 |
|
|
1269 |
#define ELF_ARCH bfd_arch_m68hc11 |
#define ELF_ARCH bfd_arch_m68hc11 |
1270 |
#define ELF_MACHINE_CODE EM_68HC11 |
#define ELF_MACHINE_CODE EM_68HC11 |
1271 |
#define ELF_MAXPAGESIZE 0x1000 |
#define ELF_MAXPAGESIZE 0x1000 |
1275 |
|
|
1276 |
#define elf_info_to_howto 0 |
#define elf_info_to_howto 0 |
1277 |
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
1278 |
|
#define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section |
1279 |
|
#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook |
1280 |
|
#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook |
1281 |
|
#define elf_backend_check_relocs elf32_m68hc11_check_relocs |
1282 |
|
#define elf_backend_relocate_section elf32_m68hc11_relocate_section |
1283 |
|
#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook |
1284 |
#define elf_backend_object_p 0 |
#define elf_backend_object_p 0 |
1285 |
#define elf_backend_final_write_processing 0 |
#define elf_backend_final_write_processing 0 |
1286 |
|
#define elf_backend_can_gc_sections 1 |
1287 |
|
#define elf_backend_special_sections elf32_m68hc11_special_sections |
1288 |
|
|
1289 |
|
#define bfd_elf32_bfd_link_hash_table_create \ |
1290 |
|
m68hc11_elf_bfd_link_hash_table_create |
1291 |
|
#define bfd_elf32_bfd_link_hash_table_free \ |
1292 |
|
m68hc11_elf_bfd_link_hash_table_free |
1293 |
|
#define bfd_elf32_bfd_merge_private_bfd_data \ |
1294 |
|
_bfd_m68hc11_elf_merge_private_bfd_data |
1295 |
|
#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags |
1296 |
|
#define bfd_elf32_bfd_print_private_bfd_data \ |
1297 |
|
_bfd_m68hc11_elf_print_private_bfd_data |
1298 |
|
|
1299 |
#include "elf32-target.h" |
#include "elf32-target.h" |