1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright (C) 2003-2020 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "splay-tree.h"
32 #include "xtensa-isa.h"
33 #include "xtensa-config.h"
35 /* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
36 #define OCTETS_PER_BYTE(ABFD, SEC) 1
38 #define XTENSA_NO_NOP_REMOVAL 0
40 /* Local helper functions. */
42 static bfd_boolean
add_extra_plt_sections (struct bfd_link_info
*, int);
43 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
44 static bfd_reloc_status_type bfd_elf_xtensa_reloc
45 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
46 static bfd_boolean do_fix_for_relocatable_link
47 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*);
48 static void do_fix_for_final_link
49 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*, bfd_vma
*);
51 /* Local functions to handle Xtensa configurability. */
53 static bfd_boolean
is_indirect_call_opcode (xtensa_opcode
);
54 static bfd_boolean
is_direct_call_opcode (xtensa_opcode
);
55 static bfd_boolean
is_windowed_call_opcode (xtensa_opcode
);
56 static xtensa_opcode
get_const16_opcode (void);
57 static xtensa_opcode
get_l32r_opcode (void);
58 static bfd_vma
l32r_offset (bfd_vma
, bfd_vma
);
59 static int get_relocation_opnd (xtensa_opcode
, int);
60 static int get_relocation_slot (int);
61 static xtensa_opcode get_relocation_opcode
62 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
63 static bfd_boolean is_l32r_relocation
64 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
65 static bfd_boolean
is_alt_relocation (int);
66 static bfd_boolean
is_operand_relocation (int);
67 static bfd_size_type insn_decode_len
68 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
69 static int insn_num_slots
70 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
71 static xtensa_opcode insn_decode_opcode
72 (bfd_byte
*, bfd_size_type
, bfd_size_type
, int);
73 static bfd_boolean check_branch_target_aligned
74 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
75 static bfd_boolean check_loop_aligned
76 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
77 static bfd_boolean
check_branch_target_aligned_address (bfd_vma
, int);
78 static bfd_size_type get_asm_simplify_size
79 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
81 /* Functions for link-time code simplifications. */
83 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
84 (bfd_byte
*, bfd_vma
, bfd_vma
, char **);
85 static bfd_reloc_status_type contract_asm_expansion
86 (bfd_byte
*, bfd_vma
, Elf_Internal_Rela
*, char **);
87 static xtensa_opcode
swap_callx_for_call_opcode (xtensa_opcode
);
88 static xtensa_opcode
get_expanded_call_opcode (bfd_byte
*, int, bfd_boolean
*);
90 /* Access to internal relocations, section contents and symbols. */
92 static Elf_Internal_Rela
*retrieve_internal_relocs
93 (bfd
*, asection
*, bfd_boolean
);
94 static void pin_internal_relocs (asection
*, Elf_Internal_Rela
*);
95 static void release_internal_relocs (asection
*, Elf_Internal_Rela
*);
96 static bfd_byte
*retrieve_contents (bfd
*, asection
*, bfd_boolean
);
97 static void pin_contents (asection
*, bfd_byte
*);
98 static void release_contents (asection
*, bfd_byte
*);
99 static Elf_Internal_Sym
*retrieve_local_syms (bfd
*);
101 /* Miscellaneous utility functions. */
103 static asection
*elf_xtensa_get_plt_section (struct bfd_link_info
*, int);
104 static asection
*elf_xtensa_get_gotplt_section (struct bfd_link_info
*, int);
105 static asection
*get_elf_r_symndx_section (bfd
*, unsigned long);
106 static struct elf_link_hash_entry
*get_elf_r_symndx_hash_entry
107 (bfd
*, unsigned long);
108 static bfd_vma
get_elf_r_symndx_offset (bfd
*, unsigned long);
109 static bfd_boolean
is_reloc_sym_weak (bfd
*, Elf_Internal_Rela
*);
110 static bfd_boolean
pcrel_reloc_fits (xtensa_opcode
, int, bfd_vma
, bfd_vma
);
111 static bfd_boolean
xtensa_is_property_section (asection
*);
112 static bfd_boolean
xtensa_is_insntable_section (asection
*);
113 static bfd_boolean
xtensa_is_littable_section (asection
*);
114 static bfd_boolean
xtensa_is_proptable_section (asection
*);
115 static int internal_reloc_compare (const void *, const void *);
116 static int internal_reloc_matches (const void *, const void *);
117 static asection
*xtensa_get_property_section (asection
*, const char *);
118 static flagword
xtensa_get_property_predef_flags (asection
*);
120 /* Other functions called directly by the linker. */
122 typedef void (*deps_callback_t
)
123 (asection
*, bfd_vma
, asection
*, bfd_vma
, void *);
124 extern bfd_boolean xtensa_callback_required_dependence
125 (bfd
*, asection
*, struct bfd_link_info
*, deps_callback_t
, void *);
128 /* Globally visible flag for choosing size optimization of NOP removal
129 instead of branch-target-aware minimization for NOP removal.
130 When nonzero, narrow all instructions and remove all NOPs possible
131 around longcall expansions. */
133 int elf32xtensa_size_opt
;
136 /* The "new_section_hook" is used to set up a per-section
137 "xtensa_relax_info" data structure with additional information used
138 during relaxation. */
140 typedef struct xtensa_relax_info_struct xtensa_relax_info
;
143 /* The GNU tools do not easily allow extending interfaces to pass around
144 the pointer to the Xtensa ISA information, so instead we add a global
145 variable here (in BFD) that can be used by any of the tools that need
148 xtensa_isa xtensa_default_isa
;
151 /* When this is true, relocations may have been modified to refer to
152 symbols from other input files. The per-section list of "fix"
153 records needs to be checked when resolving relocations. */
155 static bfd_boolean relaxing_section
= FALSE
;
157 /* When this is true, during final links, literals that cannot be
158 coalesced and their relocations may be moved to other sections. */
160 int elf32xtensa_no_literal_movement
= 1;
162 /* Place property records for a section into individual property section
163 with xt.prop. prefix. */
165 bfd_boolean elf32xtensa_separate_props
= FALSE
;
167 /* Rename one of the generic section flags to better document how it
169 /* Whether relocations have been processed. */
170 #define reloc_done sec_flg0
172 static reloc_howto_type elf_howto_table
[] =
174 HOWTO (R_XTENSA_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
175 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
177 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
178 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
179 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
181 /* Replace a 32-bit value with a value from the runtime linker (only
182 used by linker-generated stub functions). The r_addend value is
183 special: 1 means to substitute a pointer to the runtime linker's
184 dynamic resolver function; 2 means to substitute the link map for
185 the shared object. */
186 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
187 NULL
, "R_XTENSA_RTLD", FALSE
, 0, 0, FALSE
),
189 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
190 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
191 FALSE
, 0, 0xffffffff, FALSE
),
192 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
193 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
194 FALSE
, 0, 0xffffffff, FALSE
),
195 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
196 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
197 FALSE
, 0, 0xffffffff, FALSE
),
198 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
199 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
200 FALSE
, 0, 0xffffffff, FALSE
),
204 /* Old relocations for backward compatibility. */
205 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
206 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0", FALSE
, 0, 0, TRUE
),
207 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
208 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1", FALSE
, 0, 0, TRUE
),
209 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
210 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2", FALSE
, 0, 0, TRUE
),
212 /* Assembly auto-expansion. */
213 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
214 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND", FALSE
, 0, 0, TRUE
),
215 /* Relax assembly auto-expansion. */
216 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
217 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY", FALSE
, 0, 0, TRUE
),
221 HOWTO (R_XTENSA_32_PCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
222 bfd_elf_xtensa_reloc
, "R_XTENSA_32_PCREL",
223 FALSE
, 0, 0xffffffff, TRUE
),
225 /* GNU extension to record C++ vtable hierarchy. */
226 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
227 NULL
, "R_XTENSA_GNU_VTINHERIT",
229 /* GNU extension to record C++ vtable member usage. */
230 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
231 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
234 /* Relocations for supporting difference of symbols. */
235 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_signed
,
236 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8", FALSE
, 0, 0xff, FALSE
),
237 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_signed
,
238 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16", FALSE
, 0, 0xffff, FALSE
),
239 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
240 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32", FALSE
, 0, 0xffffffff, FALSE
),
242 /* General immediate operand relocations. */
243 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
244 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP", FALSE
, 0, 0, TRUE
),
245 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
246 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP", FALSE
, 0, 0, TRUE
),
247 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
248 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP", FALSE
, 0, 0, TRUE
),
249 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
250 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP", FALSE
, 0, 0, TRUE
),
251 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
252 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP", FALSE
, 0, 0, TRUE
),
253 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
254 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP", FALSE
, 0, 0, TRUE
),
255 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
256 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP", FALSE
, 0, 0, TRUE
),
257 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
258 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP", FALSE
, 0, 0, TRUE
),
259 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
260 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP", FALSE
, 0, 0, TRUE
),
261 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
262 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP", FALSE
, 0, 0, TRUE
),
263 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
264 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP", FALSE
, 0, 0, TRUE
),
265 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
266 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP", FALSE
, 0, 0, TRUE
),
267 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
268 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP", FALSE
, 0, 0, TRUE
),
269 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
270 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP", FALSE
, 0, 0, TRUE
),
271 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
272 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP", FALSE
, 0, 0, TRUE
),
274 /* "Alternate" relocations. The meaning of these is opcode-specific. */
275 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
276 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT", FALSE
, 0, 0, TRUE
),
277 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
278 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT", FALSE
, 0, 0, TRUE
),
279 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
280 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT", FALSE
, 0, 0, TRUE
),
281 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
282 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT", FALSE
, 0, 0, TRUE
),
283 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
284 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT", FALSE
, 0, 0, TRUE
),
285 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
286 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT", FALSE
, 0, 0, TRUE
),
287 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
288 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT", FALSE
, 0, 0, TRUE
),
289 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
290 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT", FALSE
, 0, 0, TRUE
),
291 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
292 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT", FALSE
, 0, 0, TRUE
),
293 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
294 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT", FALSE
, 0, 0, TRUE
),
295 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
296 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT", FALSE
, 0, 0, TRUE
),
297 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
298 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT", FALSE
, 0, 0, TRUE
),
299 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
300 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT", FALSE
, 0, 0, TRUE
),
301 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
302 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT", FALSE
, 0, 0, TRUE
),
303 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
304 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT", FALSE
, 0, 0, TRUE
),
306 /* TLS relocations. */
307 HOWTO (R_XTENSA_TLSDESC_FN
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
308 bfd_elf_xtensa_reloc
, "R_XTENSA_TLSDESC_FN",
309 FALSE
, 0, 0xffffffff, FALSE
),
310 HOWTO (R_XTENSA_TLSDESC_ARG
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
311 bfd_elf_xtensa_reloc
, "R_XTENSA_TLSDESC_ARG",
312 FALSE
, 0, 0xffffffff, FALSE
),
313 HOWTO (R_XTENSA_TLS_DTPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
314 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_DTPOFF",
315 FALSE
, 0, 0xffffffff, FALSE
),
316 HOWTO (R_XTENSA_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
317 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_TPOFF",
318 FALSE
, 0, 0xffffffff, FALSE
),
319 HOWTO (R_XTENSA_TLS_FUNC
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
320 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_FUNC",
322 HOWTO (R_XTENSA_TLS_ARG
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
323 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_ARG",
325 HOWTO (R_XTENSA_TLS_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
326 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_CALL",
329 HOWTO (R_XTENSA_PDIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
330 bfd_elf_xtensa_reloc
, "R_XTENSA_PDIFF8", FALSE
, 0, 0xff, FALSE
),
331 HOWTO (R_XTENSA_PDIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
332 bfd_elf_xtensa_reloc
, "R_XTENSA_PDIFF16", FALSE
, 0, 0xffff, FALSE
),
333 HOWTO (R_XTENSA_PDIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
334 bfd_elf_xtensa_reloc
, "R_XTENSA_PDIFF32", FALSE
, 0, 0xffffffff, FALSE
),
336 HOWTO (R_XTENSA_NDIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
337 bfd_elf_xtensa_reloc
, "R_XTENSA_NDIFF8", FALSE
, 0, 0xff, FALSE
),
338 HOWTO (R_XTENSA_NDIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
339 bfd_elf_xtensa_reloc
, "R_XTENSA_NDIFF16", FALSE
, 0, 0xffff, FALSE
),
340 HOWTO (R_XTENSA_NDIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
341 bfd_elf_xtensa_reloc
, "R_XTENSA_NDIFF32", FALSE
, 0, 0xffffffff, FALSE
),
346 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
351 static reloc_howto_type
*
352 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
353 bfd_reloc_code_real_type code
)
358 TRACE ("BFD_RELOC_NONE");
359 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
362 TRACE ("BFD_RELOC_32");
363 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
365 case BFD_RELOC_32_PCREL
:
366 TRACE ("BFD_RELOC_32_PCREL");
367 return &elf_howto_table
[(unsigned) R_XTENSA_32_PCREL
];
369 case BFD_RELOC_XTENSA_DIFF8
:
370 TRACE ("BFD_RELOC_XTENSA_DIFF8");
371 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
373 case BFD_RELOC_XTENSA_DIFF16
:
374 TRACE ("BFD_RELOC_XTENSA_DIFF16");
375 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
377 case BFD_RELOC_XTENSA_DIFF32
:
378 TRACE ("BFD_RELOC_XTENSA_DIFF32");
379 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
381 case BFD_RELOC_XTENSA_PDIFF8
:
382 TRACE ("BFD_RELOC_XTENSA_PDIFF8");
383 return &elf_howto_table
[(unsigned) R_XTENSA_PDIFF8
];
385 case BFD_RELOC_XTENSA_PDIFF16
:
386 TRACE ("BFD_RELOC_XTENSA_PDIFF16");
387 return &elf_howto_table
[(unsigned) R_XTENSA_PDIFF16
];
389 case BFD_RELOC_XTENSA_PDIFF32
:
390 TRACE ("BFD_RELOC_XTENSA_PDIFF32");
391 return &elf_howto_table
[(unsigned) R_XTENSA_PDIFF32
];
393 case BFD_RELOC_XTENSA_NDIFF8
:
394 TRACE ("BFD_RELOC_XTENSA_NDIFF8");
395 return &elf_howto_table
[(unsigned) R_XTENSA_NDIFF8
];
397 case BFD_RELOC_XTENSA_NDIFF16
:
398 TRACE ("BFD_RELOC_XTENSA_NDIFF16");
399 return &elf_howto_table
[(unsigned) R_XTENSA_NDIFF16
];
401 case BFD_RELOC_XTENSA_NDIFF32
:
402 TRACE ("BFD_RELOC_XTENSA_NDIFF32");
403 return &elf_howto_table
[(unsigned) R_XTENSA_NDIFF32
];
405 case BFD_RELOC_XTENSA_RTLD
:
406 TRACE ("BFD_RELOC_XTENSA_RTLD");
407 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
409 case BFD_RELOC_XTENSA_GLOB_DAT
:
410 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
411 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
413 case BFD_RELOC_XTENSA_JMP_SLOT
:
414 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
415 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
417 case BFD_RELOC_XTENSA_RELATIVE
:
418 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
419 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
421 case BFD_RELOC_XTENSA_PLT
:
422 TRACE ("BFD_RELOC_XTENSA_PLT");
423 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
425 case BFD_RELOC_XTENSA_OP0
:
426 TRACE ("BFD_RELOC_XTENSA_OP0");
427 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
429 case BFD_RELOC_XTENSA_OP1
:
430 TRACE ("BFD_RELOC_XTENSA_OP1");
431 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
433 case BFD_RELOC_XTENSA_OP2
:
434 TRACE ("BFD_RELOC_XTENSA_OP2");
435 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
437 case BFD_RELOC_XTENSA_ASM_EXPAND
:
438 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
439 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
441 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
442 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
443 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
445 case BFD_RELOC_VTABLE_INHERIT
:
446 TRACE ("BFD_RELOC_VTABLE_INHERIT");
447 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
449 case BFD_RELOC_VTABLE_ENTRY
:
450 TRACE ("BFD_RELOC_VTABLE_ENTRY");
451 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
453 case BFD_RELOC_XTENSA_TLSDESC_FN
:
454 TRACE ("BFD_RELOC_XTENSA_TLSDESC_FN");
455 return &elf_howto_table
[(unsigned) R_XTENSA_TLSDESC_FN
];
457 case BFD_RELOC_XTENSA_TLSDESC_ARG
:
458 TRACE ("BFD_RELOC_XTENSA_TLSDESC_ARG");
459 return &elf_howto_table
[(unsigned) R_XTENSA_TLSDESC_ARG
];
461 case BFD_RELOC_XTENSA_TLS_DTPOFF
:
462 TRACE ("BFD_RELOC_XTENSA_TLS_DTPOFF");
463 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_DTPOFF
];
465 case BFD_RELOC_XTENSA_TLS_TPOFF
:
466 TRACE ("BFD_RELOC_XTENSA_TLS_TPOFF");
467 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_TPOFF
];
469 case BFD_RELOC_XTENSA_TLS_FUNC
:
470 TRACE ("BFD_RELOC_XTENSA_TLS_FUNC");
471 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_FUNC
];
473 case BFD_RELOC_XTENSA_TLS_ARG
:
474 TRACE ("BFD_RELOC_XTENSA_TLS_ARG");
475 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_ARG
];
477 case BFD_RELOC_XTENSA_TLS_CALL
:
478 TRACE ("BFD_RELOC_XTENSA_TLS_CALL");
479 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_CALL
];
482 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
483 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
485 unsigned n
= (R_XTENSA_SLOT0_OP
+
486 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
487 return &elf_howto_table
[n
];
490 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
491 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
493 unsigned n
= (R_XTENSA_SLOT0_ALT
+
494 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
495 return &elf_howto_table
[n
];
501 /* xgettext:c-format */
502 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd
, (int) code
);
503 bfd_set_error (bfd_error_bad_value
);
508 static reloc_howto_type
*
509 elf_xtensa_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
514 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
515 if (elf_howto_table
[i
].name
!= NULL
516 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
517 return &elf_howto_table
[i
];
523 /* Given an ELF "rela" relocation, find the corresponding howto and record
524 it in the BFD internal arelent representation of the relocation. */
527 elf_xtensa_info_to_howto_rela (bfd
*abfd
,
529 Elf_Internal_Rela
*dst
)
531 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
533 if (r_type
>= (unsigned int) R_XTENSA_max
)
535 /* xgettext:c-format */
536 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
538 bfd_set_error (bfd_error_bad_value
);
541 cache_ptr
->howto
= &elf_howto_table
[r_type
];
546 /* Functions for the Xtensa ELF linker. */
548 /* The name of the dynamic interpreter. This is put in the .interp
551 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
553 /* The size in bytes of an entry in the procedure linkage table.
554 (This does _not_ include the space for the literals associated with
557 #define PLT_ENTRY_SIZE 16
559 /* For _really_ large PLTs, we may need to alternate between literals
560 and code to keep the literals within the 256K range of the L32R
561 instructions in the code. It's unlikely that anyone would ever need
562 such a big PLT, but an arbitrary limit on the PLT size would be bad.
563 Thus, we split the PLT into chunks. Since there's very little
564 overhead (2 extra literals) for each chunk, the chunk size is kept
565 small so that the code for handling multiple chunks get used and
566 tested regularly. With 254 entries, there are 1K of literals for
567 each chunk, and that seems like a nice round number. */
569 #define PLT_ENTRIES_PER_CHUNK 254
571 /* PLT entries are actually used as stub functions for lazy symbol
572 resolution. Once the symbol is resolved, the stub function is never
573 invoked. Note: the 32-byte frame size used here cannot be changed
574 without a corresponding change in the runtime linker. */
576 static const bfd_byte elf_xtensa_be_plt_entry
[][PLT_ENTRY_SIZE
] =
579 0x6c, 0x10, 0x04, /* entry sp, 32 */
580 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
581 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
582 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
583 0x0a, 0x80, 0x00, /* jx a8 */
587 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
588 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
589 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
590 0x0a, 0x80, 0x00, /* jx a8 */
595 static const bfd_byte elf_xtensa_le_plt_entry
[][PLT_ENTRY_SIZE
] =
598 0x36, 0x41, 0x00, /* entry sp, 32 */
599 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
600 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
601 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
602 0xa0, 0x08, 0x00, /* jx a8 */
606 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
607 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
608 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
609 0xa0, 0x08, 0x00, /* jx a8 */
614 /* The size of the thread control block. */
617 struct elf_xtensa_link_hash_entry
619 struct elf_link_hash_entry elf
;
621 bfd_signed_vma tlsfunc_refcount
;
623 #define GOT_UNKNOWN 0
625 #define GOT_TLS_GD 2 /* global or local dynamic */
626 #define GOT_TLS_IE 4 /* initial or local exec */
627 #define GOT_TLS_ANY (GOT_TLS_GD | GOT_TLS_IE)
628 unsigned char tls_type
;
631 #define elf_xtensa_hash_entry(ent) ((struct elf_xtensa_link_hash_entry *)(ent))
633 struct elf_xtensa_obj_tdata
635 struct elf_obj_tdata root
;
637 /* tls_type for each local got entry. */
638 char *local_got_tls_type
;
640 bfd_signed_vma
*local_tlsfunc_refcounts
;
643 #define elf_xtensa_tdata(abfd) \
644 ((struct elf_xtensa_obj_tdata *) (abfd)->tdata.any)
646 #define elf_xtensa_local_got_tls_type(abfd) \
647 (elf_xtensa_tdata (abfd)->local_got_tls_type)
649 #define elf_xtensa_local_tlsfunc_refcounts(abfd) \
650 (elf_xtensa_tdata (abfd)->local_tlsfunc_refcounts)
652 #define is_xtensa_elf(bfd) \
653 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
654 && elf_tdata (bfd) != NULL \
655 && elf_object_id (bfd) == XTENSA_ELF_DATA)
658 elf_xtensa_mkobject (bfd
*abfd
)
660 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_xtensa_obj_tdata
),
664 /* Xtensa ELF linker hash table. */
666 struct elf_xtensa_link_hash_table
668 struct elf_link_hash_table elf
;
670 /* Short-cuts to get to dynamic linker sections. */
672 asection
*spltlittbl
;
674 /* Total count of PLT relocations seen during check_relocs.
675 The actual PLT code must be split into multiple sections and all
676 the sections have to be created before size_dynamic_sections,
677 where we figure out the exact number of PLT entries that will be
678 needed. It is OK if this count is an overestimate, e.g., some
679 relocations may be removed by GC. */
682 struct elf_xtensa_link_hash_entry
*tlsbase
;
685 /* Get the Xtensa ELF linker hash table from a link_info structure. */
687 #define elf_xtensa_hash_table(p) \
688 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
689 == XTENSA_ELF_DATA ? ((struct elf_xtensa_link_hash_table *) ((p)->hash)) : NULL)
691 /* Create an entry in an Xtensa ELF linker hash table. */
693 static struct bfd_hash_entry
*
694 elf_xtensa_link_hash_newfunc (struct bfd_hash_entry
*entry
,
695 struct bfd_hash_table
*table
,
698 /* Allocate the structure if it has not already been allocated by a
702 entry
= bfd_hash_allocate (table
,
703 sizeof (struct elf_xtensa_link_hash_entry
));
708 /* Call the allocation method of the superclass. */
709 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
712 struct elf_xtensa_link_hash_entry
*eh
= elf_xtensa_hash_entry (entry
);
713 eh
->tlsfunc_refcount
= 0;
714 eh
->tls_type
= GOT_UNKNOWN
;
720 /* Create an Xtensa ELF linker hash table. */
722 static struct bfd_link_hash_table
*
723 elf_xtensa_link_hash_table_create (bfd
*abfd
)
725 struct elf_link_hash_entry
*tlsbase
;
726 struct elf_xtensa_link_hash_table
*ret
;
727 size_t amt
= sizeof (struct elf_xtensa_link_hash_table
);
729 ret
= bfd_zmalloc (amt
);
733 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
734 elf_xtensa_link_hash_newfunc
,
735 sizeof (struct elf_xtensa_link_hash_entry
),
742 /* Create a hash entry for "_TLS_MODULE_BASE_" to speed up checking
744 tlsbase
= elf_link_hash_lookup (&ret
->elf
, "_TLS_MODULE_BASE_",
746 tlsbase
->root
.type
= bfd_link_hash_new
;
747 tlsbase
->root
.u
.undef
.abfd
= NULL
;
748 tlsbase
->non_elf
= 0;
749 ret
->tlsbase
= elf_xtensa_hash_entry (tlsbase
);
750 ret
->tlsbase
->tls_type
= GOT_UNKNOWN
;
752 return &ret
->elf
.root
;
755 /* Copy the extra info we tack onto an elf_link_hash_entry. */
758 elf_xtensa_copy_indirect_symbol (struct bfd_link_info
*info
,
759 struct elf_link_hash_entry
*dir
,
760 struct elf_link_hash_entry
*ind
)
762 struct elf_xtensa_link_hash_entry
*edir
, *eind
;
764 edir
= elf_xtensa_hash_entry (dir
);
765 eind
= elf_xtensa_hash_entry (ind
);
767 if (ind
->root
.type
== bfd_link_hash_indirect
)
769 edir
->tlsfunc_refcount
+= eind
->tlsfunc_refcount
;
770 eind
->tlsfunc_refcount
= 0;
772 if (dir
->got
.refcount
<= 0)
774 edir
->tls_type
= eind
->tls_type
;
775 eind
->tls_type
= GOT_UNKNOWN
;
779 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
782 static inline bfd_boolean
783 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
784 struct bfd_link_info
*info
)
786 /* Check if we should do dynamic things to this symbol. The
787 "ignore_protected" argument need not be set, because Xtensa code
788 does not require special handling of STV_PROTECTED to make function
789 pointer comparisons work properly. The PLT addresses are never
790 used for function pointers. */
792 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
797 property_table_compare (const void *ap
, const void *bp
)
799 const property_table_entry
*a
= (const property_table_entry
*) ap
;
800 const property_table_entry
*b
= (const property_table_entry
*) bp
;
802 if (a
->address
== b
->address
)
804 if (a
->size
!= b
->size
)
805 return (a
->size
- b
->size
);
807 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
808 return ((b
->flags
& XTENSA_PROP_ALIGN
)
809 - (a
->flags
& XTENSA_PROP_ALIGN
));
811 if ((a
->flags
& XTENSA_PROP_ALIGN
)
812 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
813 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
814 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
815 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
817 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
818 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
819 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
820 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
822 return (a
->flags
- b
->flags
);
825 return (a
->address
- b
->address
);
830 property_table_matches (const void *ap
, const void *bp
)
832 const property_table_entry
*a
= (const property_table_entry
*) ap
;
833 const property_table_entry
*b
= (const property_table_entry
*) bp
;
835 /* Check if one entry overlaps with the other. */
836 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
837 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
840 return (a
->address
- b
->address
);
844 /* Get the literal table or property table entries for the given
845 section. Sets TABLE_P and returns the number of entries. On
846 error, returns a negative value. */
849 xtensa_read_table_entries (bfd
*abfd
,
851 property_table_entry
**table_p
,
852 const char *sec_name
,
853 bfd_boolean output_addr
)
855 asection
*table_section
;
856 bfd_size_type table_size
= 0;
857 bfd_byte
*table_data
;
858 property_table_entry
*blocks
;
859 int blk
, block_count
;
860 bfd_size_type num_records
;
861 Elf_Internal_Rela
*internal_relocs
, *irel
, *rel_end
;
862 bfd_vma section_addr
, off
;
863 flagword predef_flags
;
864 bfd_size_type table_entry_size
, section_limit
;
867 || !(section
->flags
& SEC_ALLOC
)
868 || (section
->flags
& SEC_DEBUGGING
))
874 table_section
= xtensa_get_property_section (section
, sec_name
);
876 table_size
= table_section
->size
;
884 predef_flags
= xtensa_get_property_predef_flags (table_section
);
885 table_entry_size
= 12;
887 table_entry_size
-= 4;
889 num_records
= table_size
/ table_entry_size
;
890 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
891 blocks
= (property_table_entry
*)
892 bfd_malloc (num_records
* sizeof (property_table_entry
));
896 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
898 section_addr
= section
->vma
;
900 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
901 if (internal_relocs
&& !table_section
->reloc_done
)
903 qsort (internal_relocs
, table_section
->reloc_count
,
904 sizeof (Elf_Internal_Rela
), internal_reloc_compare
);
905 irel
= internal_relocs
;
910 section_limit
= bfd_get_section_limit (abfd
, section
);
911 rel_end
= internal_relocs
+ table_section
->reloc_count
;
913 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
915 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
917 /* Skip any relocations before the current offset. This should help
918 avoid confusion caused by unexpected relocations for the preceding
921 (irel
->r_offset
< off
922 || (irel
->r_offset
== off
923 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_NONE
)))
930 if (irel
&& irel
->r_offset
== off
)
933 unsigned long r_symndx
= ELF32_R_SYM (irel
->r_info
);
934 BFD_ASSERT (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
);
936 if (get_elf_r_symndx_section (abfd
, r_symndx
) != section
)
939 sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
940 BFD_ASSERT (sym_off
== 0);
941 address
+= (section_addr
+ sym_off
+ irel
->r_addend
);
945 if (address
< section_addr
946 || address
>= section_addr
+ section_limit
)
950 blocks
[block_count
].address
= address
;
951 blocks
[block_count
].size
= bfd_get_32 (abfd
, table_data
+ off
+ 4);
953 blocks
[block_count
].flags
= predef_flags
;
955 blocks
[block_count
].flags
= bfd_get_32 (abfd
, table_data
+ off
+ 8);
959 release_contents (table_section
, table_data
);
960 release_internal_relocs (table_section
, internal_relocs
);
964 /* Now sort them into address order for easy reference. */
965 qsort (blocks
, block_count
, sizeof (property_table_entry
),
966 property_table_compare
);
968 /* Check that the table contents are valid. Problems may occur,
969 for example, if an unrelocated object file is stripped. */
970 for (blk
= 1; blk
< block_count
; blk
++)
972 /* The only circumstance where two entries may legitimately
973 have the same address is when one of them is a zero-size
974 placeholder to mark a place where fill can be inserted.
975 The zero-size entry should come first. */
976 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
977 blocks
[blk
- 1].size
!= 0)
979 /* xgettext:c-format */
980 _bfd_error_handler (_("%pB(%pA): invalid property table"),
982 bfd_set_error (bfd_error_bad_value
);
994 static property_table_entry
*
995 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
996 int property_table_size
,
999 property_table_entry entry
;
1000 property_table_entry
*rv
;
1002 if (property_table_size
== 0)
1005 entry
.address
= addr
;
1009 rv
= bsearch (&entry
, property_table
, property_table_size
,
1010 sizeof (property_table_entry
), property_table_matches
);
1016 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
1020 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
1027 /* Look through the relocs for a section during the first phase, and
1028 calculate needed space in the dynamic reloc sections. */
1031 elf_xtensa_check_relocs (bfd
*abfd
,
1032 struct bfd_link_info
*info
,
1034 const Elf_Internal_Rela
*relocs
)
1036 struct elf_xtensa_link_hash_table
*htab
;
1037 Elf_Internal_Shdr
*symtab_hdr
;
1038 struct elf_link_hash_entry
**sym_hashes
;
1039 const Elf_Internal_Rela
*rel
;
1040 const Elf_Internal_Rela
*rel_end
;
1042 if (bfd_link_relocatable (info
))
1045 BFD_ASSERT (is_xtensa_elf (abfd
));
1047 htab
= elf_xtensa_hash_table (info
);
1051 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1052 sym_hashes
= elf_sym_hashes (abfd
);
1054 rel_end
= relocs
+ sec
->reloc_count
;
1055 for (rel
= relocs
; rel
< rel_end
; rel
++)
1057 unsigned int r_type
;
1059 struct elf_link_hash_entry
*h
= NULL
;
1060 struct elf_xtensa_link_hash_entry
*eh
;
1061 int tls_type
, old_tls_type
;
1062 bfd_boolean is_got
= FALSE
;
1063 bfd_boolean is_plt
= FALSE
;
1064 bfd_boolean is_tlsfunc
= FALSE
;
1066 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1067 r_type
= ELF32_R_TYPE (rel
->r_info
);
1069 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1071 /* xgettext:c-format */
1072 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1077 if (r_symndx
>= symtab_hdr
->sh_info
)
1079 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1080 while (h
->root
.type
== bfd_link_hash_indirect
1081 || h
->root
.type
== bfd_link_hash_warning
)
1082 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1084 eh
= elf_xtensa_hash_entry (h
);
1088 case R_XTENSA_TLSDESC_FN
:
1089 if (bfd_link_pic (info
))
1091 tls_type
= GOT_TLS_GD
;
1096 tls_type
= GOT_TLS_IE
;
1099 case R_XTENSA_TLSDESC_ARG
:
1100 if (bfd_link_pic (info
))
1102 tls_type
= GOT_TLS_GD
;
1107 tls_type
= GOT_TLS_IE
;
1108 if (h
&& elf_xtensa_hash_entry (h
) != htab
->tlsbase
)
1113 case R_XTENSA_TLS_DTPOFF
:
1114 if (bfd_link_pic (info
))
1115 tls_type
= GOT_TLS_GD
;
1117 tls_type
= GOT_TLS_IE
;
1120 case R_XTENSA_TLS_TPOFF
:
1121 tls_type
= GOT_TLS_IE
;
1122 if (bfd_link_pic (info
))
1123 info
->flags
|= DF_STATIC_TLS
;
1124 if (bfd_link_pic (info
) || h
)
1129 tls_type
= GOT_NORMAL
;
1134 tls_type
= GOT_NORMAL
;
1138 case R_XTENSA_GNU_VTINHERIT
:
1139 /* This relocation describes the C++ object vtable hierarchy.
1140 Reconstruct it for later use during GC. */
1141 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1145 case R_XTENSA_GNU_VTENTRY
:
1146 /* This relocation describes which C++ vtable entries are actually
1147 used. Record for later use during GC. */
1148 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1153 /* Nothing to do for any other relocations. */
1161 if (h
->plt
.refcount
<= 0)
1164 h
->plt
.refcount
= 1;
1167 h
->plt
.refcount
+= 1;
1169 /* Keep track of the total PLT relocation count even if we
1170 don't yet know whether the dynamic sections will be
1172 htab
->plt_reloc_count
+= 1;
1174 if (elf_hash_table (info
)->dynamic_sections_created
)
1176 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1182 if (h
->got
.refcount
<= 0)
1183 h
->got
.refcount
= 1;
1185 h
->got
.refcount
+= 1;
1189 eh
->tlsfunc_refcount
+= 1;
1191 old_tls_type
= eh
->tls_type
;
1195 /* Allocate storage the first time. */
1196 if (elf_local_got_refcounts (abfd
) == NULL
)
1198 bfd_size_type size
= symtab_hdr
->sh_info
;
1201 mem
= bfd_zalloc (abfd
, size
* sizeof (bfd_signed_vma
));
1204 elf_local_got_refcounts (abfd
) = (bfd_signed_vma
*) mem
;
1206 mem
= bfd_zalloc (abfd
, size
);
1209 elf_xtensa_local_got_tls_type (abfd
) = (char *) mem
;
1211 mem
= bfd_zalloc (abfd
, size
* sizeof (bfd_signed_vma
));
1214 elf_xtensa_local_tlsfunc_refcounts (abfd
)
1215 = (bfd_signed_vma
*) mem
;
1218 /* This is a global offset table entry for a local symbol. */
1219 if (is_got
|| is_plt
)
1220 elf_local_got_refcounts (abfd
) [r_symndx
] += 1;
1223 elf_xtensa_local_tlsfunc_refcounts (abfd
) [r_symndx
] += 1;
1225 old_tls_type
= elf_xtensa_local_got_tls_type (abfd
) [r_symndx
];
1228 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1229 tls_type
|= old_tls_type
;
1230 /* If a TLS symbol is accessed using IE at least once,
1231 there is no point to use a dynamic model for it. */
1232 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1233 && ((old_tls_type
& GOT_TLS_GD
) == 0
1234 || (tls_type
& GOT_TLS_IE
) == 0))
1236 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_GD
))
1237 tls_type
= old_tls_type
;
1238 else if ((old_tls_type
& GOT_TLS_GD
) && (tls_type
& GOT_TLS_GD
))
1239 tls_type
|= old_tls_type
;
1243 /* xgettext:c-format */
1244 (_("%pB: `%s' accessed both as normal and thread local symbol"),
1246 h
? h
->root
.root
.string
: "<local>");
1251 if (old_tls_type
!= tls_type
)
1254 eh
->tls_type
= tls_type
;
1256 elf_xtensa_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1265 elf_xtensa_make_sym_local (struct bfd_link_info
*info
,
1266 struct elf_link_hash_entry
*h
)
1268 if (bfd_link_pic (info
))
1270 if (h
->plt
.refcount
> 0)
1272 /* For shared objects, there's no need for PLT entries for local
1273 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
1274 if (h
->got
.refcount
< 0)
1275 h
->got
.refcount
= 0;
1276 h
->got
.refcount
+= h
->plt
.refcount
;
1277 h
->plt
.refcount
= 0;
1282 /* Don't need any dynamic relocations at all. */
1283 h
->plt
.refcount
= 0;
1284 h
->got
.refcount
= 0;
1290 elf_xtensa_hide_symbol (struct bfd_link_info
*info
,
1291 struct elf_link_hash_entry
*h
,
1292 bfd_boolean force_local
)
1294 /* For a shared link, move the plt refcount to the got refcount to leave
1295 space for RELATIVE relocs. */
1296 elf_xtensa_make_sym_local (info
, h
);
1298 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
1302 /* Return the section that should be marked against GC for a given
1306 elf_xtensa_gc_mark_hook (asection
*sec
,
1307 struct bfd_link_info
*info
,
1308 Elf_Internal_Rela
*rel
,
1309 struct elf_link_hash_entry
*h
,
1310 Elf_Internal_Sym
*sym
)
1312 /* Property sections are marked "KEEP" in the linker scripts, but they
1313 should not cause other sections to be marked. (This approach relies
1314 on elf_xtensa_discard_info to remove property table entries that
1315 describe discarded sections. Alternatively, it might be more
1316 efficient to avoid using "KEEP" in the linker scripts and instead use
1317 the gc_mark_extra_sections hook to mark only the property sections
1318 that describe marked sections. That alternative does not work well
1319 with the current property table sections, which do not correspond
1320 one-to-one with the sections they describe, but that should be fixed
1322 if (xtensa_is_property_section (sec
))
1326 switch (ELF32_R_TYPE (rel
->r_info
))
1328 case R_XTENSA_GNU_VTINHERIT
:
1329 case R_XTENSA_GNU_VTENTRY
:
1333 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1337 /* Create all the dynamic sections. */
1340 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1342 struct elf_xtensa_link_hash_table
*htab
;
1343 flagword flags
, noalloc_flags
;
1345 htab
= elf_xtensa_hash_table (info
);
1349 /* First do all the standard stuff. */
1350 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1353 /* Create any extra PLT sections in case check_relocs has already
1354 been called on all the non-dynamic input files. */
1355 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1358 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1359 | SEC_LINKER_CREATED
| SEC_READONLY
);
1360 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1362 /* Mark the ".got.plt" section READONLY. */
1363 if (htab
->elf
.sgotplt
== NULL
1364 || !bfd_set_section_flags (htab
->elf
.sgotplt
, flags
))
1367 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1368 htab
->sgotloc
= bfd_make_section_anyway_with_flags (dynobj
, ".got.loc",
1370 if (htab
->sgotloc
== NULL
1371 || !bfd_set_section_alignment (htab
->sgotloc
, 2))
1374 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1375 htab
->spltlittbl
= bfd_make_section_anyway_with_flags (dynobj
, ".xt.lit.plt",
1377 if (htab
->spltlittbl
== NULL
1378 || !bfd_set_section_alignment (htab
->spltlittbl
, 2))
1386 add_extra_plt_sections (struct bfd_link_info
*info
, int count
)
1388 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
1391 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1392 ".got.plt" sections. */
1393 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1399 /* Stop when we find a section has already been created. */
1400 if (elf_xtensa_get_plt_section (info
, chunk
))
1403 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1404 | SEC_LINKER_CREATED
| SEC_READONLY
);
1406 sname
= (char *) bfd_malloc (10);
1407 sprintf (sname
, ".plt.%u", chunk
);
1408 s
= bfd_make_section_anyway_with_flags (dynobj
, sname
, flags
| SEC_CODE
);
1410 || !bfd_set_section_alignment (s
, 2))
1413 sname
= (char *) bfd_malloc (14);
1414 sprintf (sname
, ".got.plt.%u", chunk
);
1415 s
= bfd_make_section_anyway_with_flags (dynobj
, sname
, flags
);
1417 || !bfd_set_section_alignment (s
, 2))
1425 /* Adjust a symbol defined by a dynamic object and referenced by a
1426 regular object. The current definition is in some section of the
1427 dynamic object, but we're not including those sections. We have to
1428 change the definition to something the rest of the link can
1432 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1433 struct elf_link_hash_entry
*h
)
1435 /* If this is a weak symbol, and there is a real definition, the
1436 processor independent code will have arranged for us to see the
1437 real definition first, and we can just use the same value. */
1438 if (h
->is_weakalias
)
1440 struct elf_link_hash_entry
*def
= weakdef (h
);
1441 BFD_ASSERT (def
->root
.type
== bfd_link_hash_defined
);
1442 h
->root
.u
.def
.section
= def
->root
.u
.def
.section
;
1443 h
->root
.u
.def
.value
= def
->root
.u
.def
.value
;
1447 /* This is a reference to a symbol defined by a dynamic object. The
1448 reference must go through the GOT, so there's no need for COPY relocs,
1456 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *arg
)
1458 struct bfd_link_info
*info
;
1459 struct elf_xtensa_link_hash_table
*htab
;
1460 struct elf_xtensa_link_hash_entry
*eh
= elf_xtensa_hash_entry (h
);
1462 if (h
->root
.type
== bfd_link_hash_indirect
)
1465 info
= (struct bfd_link_info
*) arg
;
1466 htab
= elf_xtensa_hash_table (info
);
1470 /* If we saw any use of an IE model for this symbol, we can then optimize
1471 away GOT entries for any TLSDESC_FN relocs. */
1472 if ((eh
->tls_type
& GOT_TLS_IE
) != 0)
1474 BFD_ASSERT (h
->got
.refcount
>= eh
->tlsfunc_refcount
);
1475 h
->got
.refcount
-= eh
->tlsfunc_refcount
;
1478 if (! elf_xtensa_dynamic_symbol_p (h
, info
))
1479 elf_xtensa_make_sym_local (info
, h
);
1481 if (! elf_xtensa_dynamic_symbol_p (h
, info
)
1482 && h
->root
.type
== bfd_link_hash_undefweak
)
1485 if (h
->plt
.refcount
> 0)
1486 htab
->elf
.srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1488 if (h
->got
.refcount
> 0)
1489 htab
->elf
.srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1496 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
)
1498 struct elf_xtensa_link_hash_table
*htab
;
1501 htab
= elf_xtensa_hash_table (info
);
1505 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
1507 bfd_signed_vma
*local_got_refcounts
;
1508 bfd_size_type j
, cnt
;
1509 Elf_Internal_Shdr
*symtab_hdr
;
1511 local_got_refcounts
= elf_local_got_refcounts (i
);
1512 if (!local_got_refcounts
)
1515 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1516 cnt
= symtab_hdr
->sh_info
;
1518 for (j
= 0; j
< cnt
; ++j
)
1520 /* If we saw any use of an IE model for this symbol, we can
1521 then optimize away GOT entries for any TLSDESC_FN relocs. */
1522 if ((elf_xtensa_local_got_tls_type (i
) [j
] & GOT_TLS_IE
) != 0)
1524 bfd_signed_vma
*tlsfunc_refcount
1525 = &elf_xtensa_local_tlsfunc_refcounts (i
) [j
];
1526 BFD_ASSERT (local_got_refcounts
[j
] >= *tlsfunc_refcount
);
1527 local_got_refcounts
[j
] -= *tlsfunc_refcount
;
1530 if (local_got_refcounts
[j
] > 0)
1531 htab
->elf
.srelgot
->size
+= (local_got_refcounts
[j
]
1532 * sizeof (Elf32_External_Rela
));
1538 /* Set the sizes of the dynamic sections. */
1541 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1542 struct bfd_link_info
*info
)
1544 struct elf_xtensa_link_hash_table
*htab
;
1546 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1547 bfd_boolean relplt
, relgot
;
1548 int plt_entries
, plt_chunks
, chunk
;
1553 htab
= elf_xtensa_hash_table (info
);
1557 dynobj
= elf_hash_table (info
)->dynobj
;
1560 srelgot
= htab
->elf
.srelgot
;
1561 srelplt
= htab
->elf
.srelplt
;
1563 if (elf_hash_table (info
)->dynamic_sections_created
)
1565 BFD_ASSERT (htab
->elf
.srelgot
!= NULL
1566 && htab
->elf
.srelplt
!= NULL
1567 && htab
->elf
.sgot
!= NULL
1568 && htab
->spltlittbl
!= NULL
1569 && htab
->sgotloc
!= NULL
);
1571 /* Set the contents of the .interp section to the interpreter. */
1572 if (bfd_link_executable (info
) && !info
->nointerp
)
1574 s
= bfd_get_linker_section (dynobj
, ".interp");
1577 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1578 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1581 /* Allocate room for one word in ".got". */
1582 htab
->elf
.sgot
->size
= 4;
1584 /* Allocate space in ".rela.got" for literals that reference global
1585 symbols and space in ".rela.plt" for literals that have PLT
1587 elf_link_hash_traverse (elf_hash_table (info
),
1588 elf_xtensa_allocate_dynrelocs
,
1591 /* If we are generating a shared object, we also need space in
1592 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1593 reference local symbols. */
1594 if (bfd_link_pic (info
))
1595 elf_xtensa_allocate_local_got_size (info
);
1597 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1598 each PLT entry, we need the PLT code plus a 4-byte literal.
1599 For each chunk of ".plt", we also need two more 4-byte
1600 literals, two corresponding entries in ".rela.got", and an
1601 8-byte entry in ".xt.lit.plt". */
1602 spltlittbl
= htab
->spltlittbl
;
1603 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1605 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1607 /* Iterate over all the PLT chunks, including any extra sections
1608 created earlier because the initial count of PLT relocations
1609 was an overestimate. */
1611 (splt
= elf_xtensa_get_plt_section (info
, chunk
)) != NULL
;
1616 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1617 BFD_ASSERT (sgotplt
!= NULL
);
1619 if (chunk
< plt_chunks
- 1)
1620 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1621 else if (chunk
== plt_chunks
- 1)
1622 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1626 if (chunk_entries
!= 0)
1628 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1629 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1630 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1631 spltlittbl
->size
+= 8;
1640 /* Allocate space in ".got.loc" to match the total size of all the
1642 sgotloc
= htab
->sgotloc
;
1643 sgotloc
->size
= spltlittbl
->size
;
1644 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
1646 if (abfd
->flags
& DYNAMIC
)
1648 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1650 if (! discarded_section (s
)
1651 && xtensa_is_littable_section (s
)
1653 sgotloc
->size
+= s
->size
;
1658 /* Allocate memory for dynamic sections. */
1661 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1665 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1668 /* It's OK to base decisions on the section name, because none
1669 of the dynobj section names depend upon the input files. */
1670 name
= bfd_section_name (s
);
1672 if (CONST_STRNEQ (name
, ".rela"))
1676 if (strcmp (name
, ".rela.plt") == 0)
1678 else if (strcmp (name
, ".rela.got") == 0)
1681 /* We use the reloc_count field as a counter if we need
1682 to copy relocs into the output file. */
1686 else if (! CONST_STRNEQ (name
, ".plt.")
1687 && ! CONST_STRNEQ (name
, ".got.plt.")
1688 && strcmp (name
, ".got") != 0
1689 && strcmp (name
, ".plt") != 0
1690 && strcmp (name
, ".got.plt") != 0
1691 && strcmp (name
, ".xt.lit.plt") != 0
1692 && strcmp (name
, ".got.loc") != 0)
1694 /* It's not one of our sections, so don't allocate space. */
1700 /* If we don't need this section, strip it from the output
1701 file. We must create the ".plt*" and ".got.plt*"
1702 sections in create_dynamic_sections and/or check_relocs
1703 based on a conservative estimate of the PLT relocation
1704 count, because the sections must be created before the
1705 linker maps input sections to output sections. The
1706 linker does that before size_dynamic_sections, where we
1707 compute the exact size of the PLT, so there may be more
1708 of these sections than are actually needed. */
1709 s
->flags
|= SEC_EXCLUDE
;
1711 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1713 /* Allocate memory for the section contents. */
1714 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1715 if (s
->contents
== NULL
)
1720 if (elf_hash_table (info
)->dynamic_sections_created
)
1722 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1723 known until finish_dynamic_sections, but we need to get the relocs
1724 in place before they are sorted. */
1725 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1727 Elf_Internal_Rela irela
;
1731 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1734 loc
= (srelgot
->contents
1735 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1736 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1737 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1738 loc
+ sizeof (Elf32_External_Rela
));
1739 srelgot
->reloc_count
+= 2;
1742 /* Add some entries to the .dynamic section. We fill in the
1743 values later, in elf_xtensa_finish_dynamic_sections, but we
1744 must add the entries now so that we get the correct size for
1745 the .dynamic section. The DT_DEBUG entry is filled in by the
1746 dynamic linker and used by the debugger. */
1747 #define add_dynamic_entry(TAG, VAL) \
1748 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1750 if (bfd_link_executable (info
))
1752 if (!add_dynamic_entry (DT_DEBUG
, 0))
1758 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
1759 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1760 || !add_dynamic_entry (DT_JMPREL
, 0))
1766 if (!add_dynamic_entry (DT_RELA
, 0)
1767 || !add_dynamic_entry (DT_RELASZ
, 0)
1768 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1772 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1773 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1774 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1777 #undef add_dynamic_entry
1783 elf_xtensa_always_size_sections (bfd
*output_bfd
,
1784 struct bfd_link_info
*info
)
1786 struct elf_xtensa_link_hash_table
*htab
;
1789 htab
= elf_xtensa_hash_table (info
);
1793 tls_sec
= htab
->elf
.tls_sec
;
1795 if (tls_sec
&& (htab
->tlsbase
->tls_type
& GOT_TLS_ANY
) != 0)
1797 struct elf_link_hash_entry
*tlsbase
= &htab
->tlsbase
->elf
;
1798 struct bfd_link_hash_entry
*bh
= &tlsbase
->root
;
1799 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
1801 tlsbase
->type
= STT_TLS
;
1802 if (!(_bfd_generic_link_add_one_symbol
1803 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1804 tls_sec
, 0, NULL
, FALSE
,
1805 bed
->collect
, &bh
)))
1807 tlsbase
->def_regular
= 1;
1808 tlsbase
->other
= STV_HIDDEN
;
1809 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1816 /* Return the base VMA address which should be subtracted from real addresses
1817 when resolving @dtpoff relocation.
1818 This is PT_TLS segment p_vaddr. */
1821 dtpoff_base (struct bfd_link_info
*info
)
1823 /* If tls_sec is NULL, we should have signalled an error already. */
1824 if (elf_hash_table (info
)->tls_sec
== NULL
)
1826 return elf_hash_table (info
)->tls_sec
->vma
;
1829 /* Return the relocation value for @tpoff relocation
1830 if STT_TLS virtual address is ADDRESS. */
1833 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
1835 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
1838 /* If tls_sec is NULL, we should have signalled an error already. */
1839 if (htab
->tls_sec
== NULL
)
1841 base
= align_power ((bfd_vma
) TCB_SIZE
, htab
->tls_sec
->alignment_power
);
1842 return address
- htab
->tls_sec
->vma
+ base
;
1845 /* Perform the specified relocation. The instruction at (contents + address)
1846 is modified to set one operand to represent the value in "relocation". The
1847 operand position is determined by the relocation type recorded in the
1850 #define CALL_SEGMENT_BITS (30)
1851 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1853 static bfd_reloc_status_type
1854 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1856 asection
*input_section
,
1860 bfd_boolean is_weak_undef
,
1861 char **error_message
)
1864 xtensa_opcode opcode
;
1865 xtensa_isa isa
= xtensa_default_isa
;
1866 static xtensa_insnbuf ibuff
= NULL
;
1867 static xtensa_insnbuf sbuff
= NULL
;
1868 bfd_vma self_address
;
1869 bfd_size_type input_size
;
1875 ibuff
= xtensa_insnbuf_alloc (isa
);
1876 sbuff
= xtensa_insnbuf_alloc (isa
);
1879 input_size
= bfd_get_section_limit (abfd
, input_section
);
1881 /* Calculate the PC address for this instruction. */
1882 self_address
= (input_section
->output_section
->vma
1883 + input_section
->output_offset
1886 switch (howto
->type
)
1889 case R_XTENSA_DIFF8
:
1890 case R_XTENSA_DIFF16
:
1891 case R_XTENSA_DIFF32
:
1892 case R_XTENSA_PDIFF8
:
1893 case R_XTENSA_PDIFF16
:
1894 case R_XTENSA_PDIFF32
:
1895 case R_XTENSA_NDIFF8
:
1896 case R_XTENSA_NDIFF16
:
1897 case R_XTENSA_NDIFF32
:
1898 case R_XTENSA_TLS_FUNC
:
1899 case R_XTENSA_TLS_ARG
:
1900 case R_XTENSA_TLS_CALL
:
1901 return bfd_reloc_ok
;
1903 case R_XTENSA_ASM_EXPAND
:
1906 /* Check for windowed CALL across a 1GB boundary. */
1907 opcode
= get_expanded_call_opcode (contents
+ address
,
1908 input_size
- address
, 0);
1909 if (is_windowed_call_opcode (opcode
))
1911 if ((self_address
>> CALL_SEGMENT_BITS
)
1912 != (relocation
>> CALL_SEGMENT_BITS
))
1914 *error_message
= "windowed longcall crosses 1GB boundary; "
1916 return bfd_reloc_dangerous
;
1920 return bfd_reloc_ok
;
1922 case R_XTENSA_ASM_SIMPLIFY
:
1924 /* Convert the L32R/CALLX to CALL. */
1925 bfd_reloc_status_type retval
=
1926 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1928 if (retval
!= bfd_reloc_ok
)
1929 return bfd_reloc_dangerous
;
1931 /* The CALL needs to be relocated. Continue below for that part. */
1934 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
1941 x
= bfd_get_32 (abfd
, contents
+ address
);
1943 bfd_put_32 (abfd
, x
, contents
+ address
);
1945 return bfd_reloc_ok
;
1947 case R_XTENSA_32_PCREL
:
1948 bfd_put_32 (abfd
, relocation
- self_address
, contents
+ address
);
1949 return bfd_reloc_ok
;
1952 case R_XTENSA_TLSDESC_FN
:
1953 case R_XTENSA_TLSDESC_ARG
:
1954 case R_XTENSA_TLS_DTPOFF
:
1955 case R_XTENSA_TLS_TPOFF
:
1956 bfd_put_32 (abfd
, relocation
, contents
+ address
);
1957 return bfd_reloc_ok
;
1960 /* Only instruction slot-specific relocations handled below.... */
1961 slot
= get_relocation_slot (howto
->type
);
1962 if (slot
== XTENSA_UNDEFINED
)
1964 *error_message
= "unexpected relocation";
1965 return bfd_reloc_dangerous
;
1968 /* Read the instruction into a buffer and decode the opcode. */
1969 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
1970 input_size
- address
);
1971 fmt
= xtensa_format_decode (isa
, ibuff
);
1972 if (fmt
== XTENSA_UNDEFINED
)
1974 *error_message
= "cannot decode instruction format";
1975 return bfd_reloc_dangerous
;
1978 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1980 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
1981 if (opcode
== XTENSA_UNDEFINED
)
1983 *error_message
= "cannot decode instruction opcode";
1984 return bfd_reloc_dangerous
;
1987 /* Check for opcode-specific "alternate" relocations. */
1988 if (is_alt_relocation (howto
->type
))
1990 if (opcode
== get_l32r_opcode ())
1992 /* Handle the special-case of non-PC-relative L32R instructions. */
1993 bfd
*output_bfd
= input_section
->output_section
->owner
;
1994 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
1997 *error_message
= "relocation references missing .lit4 section";
1998 return bfd_reloc_dangerous
;
2000 self_address
= ((lit4_sec
->vma
& ~0xfff)
2001 + 0x40000 - 3); /* -3 to compensate for do_reloc */
2002 newval
= relocation
;
2005 else if (opcode
== get_const16_opcode ())
2007 /* ALT used for high 16 bits.
2008 Ignore 32-bit overflow. */
2009 newval
= (relocation
>> 16) & 0xffff;
2014 /* No other "alternate" relocations currently defined. */
2015 *error_message
= "unexpected relocation";
2016 return bfd_reloc_dangerous
;
2019 else /* Not an "alternate" relocation.... */
2021 if (opcode
== get_const16_opcode ())
2023 newval
= relocation
& 0xffff;
2028 /* ...normal PC-relative relocation.... */
2030 /* Determine which operand is being relocated. */
2031 opnd
= get_relocation_opnd (opcode
, howto
->type
);
2032 if (opnd
== XTENSA_UNDEFINED
)
2034 *error_message
= "unexpected relocation";
2035 return bfd_reloc_dangerous
;
2038 if (!howto
->pc_relative
)
2040 *error_message
= "expected PC-relative relocation";
2041 return bfd_reloc_dangerous
;
2044 newval
= relocation
;
2048 /* Apply the relocation. */
2049 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
2050 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
2051 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
2054 const char *opname
= xtensa_opcode_name (isa
, opcode
);
2057 msg
= "cannot encode";
2058 if (is_direct_call_opcode (opcode
))
2060 if ((relocation
& 0x3) != 0)
2061 msg
= "misaligned call target";
2063 msg
= "call target out of range";
2065 else if (opcode
== get_l32r_opcode ())
2067 if ((relocation
& 0x3) != 0)
2068 msg
= "misaligned literal target";
2069 else if (is_alt_relocation (howto
->type
))
2070 msg
= "literal target out of range (too many literals)";
2071 else if (self_address
> relocation
)
2072 msg
= "literal target out of range (try using text-section-literals)";
2074 msg
= "literal placed after use";
2077 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
2078 return bfd_reloc_dangerous
;
2081 /* Check for calls across 1GB boundaries. */
2082 if (is_direct_call_opcode (opcode
)
2083 && is_windowed_call_opcode (opcode
))
2085 if ((self_address
>> CALL_SEGMENT_BITS
)
2086 != (relocation
>> CALL_SEGMENT_BITS
))
2089 "windowed call crosses 1GB boundary; return may fail";
2090 return bfd_reloc_dangerous
;
2094 /* Write the modified instruction back out of the buffer. */
2095 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
2096 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
2097 input_size
- address
);
2098 return bfd_reloc_ok
;
2103 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
2105 /* To reduce the size of the memory leak,
2106 we only use a single message buffer. */
2107 static bfd_size_type alloc_size
= 0;
2108 static char *message
= NULL
;
2109 bfd_size_type orig_len
, len
= 0;
2110 bfd_boolean is_append
;
2113 va_start (ap
, arglen
);
2115 is_append
= (origmsg
== message
);
2117 orig_len
= strlen (origmsg
);
2118 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
2119 if (len
> alloc_size
)
2121 message
= (char *) bfd_realloc_or_free (message
, len
);
2124 if (message
!= NULL
)
2127 memcpy (message
, origmsg
, orig_len
);
2128 vsprintf (message
+ orig_len
, fmt
, ap
);
2135 /* This function is registered as the "special_function" in the
2136 Xtensa howto for handling simplify operations.
2137 bfd_perform_relocation / bfd_install_relocation use it to
2138 perform (install) the specified relocation. Since this replaces the code
2139 in bfd_perform_relocation, it is basically an Xtensa-specific,
2140 stripped-down version of bfd_perform_relocation. */
2142 static bfd_reloc_status_type
2143 bfd_elf_xtensa_reloc (bfd
*abfd
,
2144 arelent
*reloc_entry
,
2147 asection
*input_section
,
2149 char **error_message
)
2152 bfd_reloc_status_type flag
;
2153 bfd_size_type octets
= (reloc_entry
->address
2154 * OCTETS_PER_BYTE (abfd
, input_section
));
2155 bfd_vma output_base
= 0;
2156 reloc_howto_type
*howto
= reloc_entry
->howto
;
2157 asection
*reloc_target_output_section
;
2158 bfd_boolean is_weak_undef
;
2160 if (!xtensa_default_isa
)
2161 xtensa_default_isa
= xtensa_isa_init (0, 0);
2163 /* ELF relocs are against symbols. If we are producing relocatable
2164 output, and the reloc is against an external symbol, the resulting
2165 reloc will also be against the same symbol. In such a case, we
2166 don't want to change anything about the way the reloc is handled,
2167 since it will all be done at final link time. This test is similar
2168 to what bfd_elf_generic_reloc does except that it lets relocs with
2169 howto->partial_inplace go through even if the addend is non-zero.
2170 (The real problem is that partial_inplace is set for XTENSA_32
2171 relocs to begin with, but that's a long story and there's little we
2172 can do about it now....) */
2174 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
2176 reloc_entry
->address
+= input_section
->output_offset
;
2177 return bfd_reloc_ok
;
2180 /* Is the address of the relocation really within the section? */
2181 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
2182 return bfd_reloc_outofrange
;
2184 /* Work out which section the relocation is targeted at and the
2185 initial relocation command value. */
2187 /* Get symbol value. (Common symbols are special.) */
2188 if (bfd_is_com_section (symbol
->section
))
2191 relocation
= symbol
->value
;
2193 reloc_target_output_section
= symbol
->section
->output_section
;
2195 /* Convert input-section-relative symbol value to absolute. */
2196 if ((output_bfd
&& !howto
->partial_inplace
)
2197 || reloc_target_output_section
== NULL
)
2200 output_base
= reloc_target_output_section
->vma
;
2202 relocation
+= output_base
+ symbol
->section
->output_offset
;
2204 /* Add in supplied addend. */
2205 relocation
+= reloc_entry
->addend
;
2207 /* Here the variable relocation holds the final address of the
2208 symbol we are relocating against, plus any addend. */
2211 if (!howto
->partial_inplace
)
2213 /* This is a partial relocation, and we want to apply the relocation
2214 to the reloc entry rather than the raw data. Everything except
2215 relocations against section symbols has already been handled
2218 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
2219 reloc_entry
->addend
= relocation
;
2220 reloc_entry
->address
+= input_section
->output_offset
;
2221 return bfd_reloc_ok
;
2225 reloc_entry
->address
+= input_section
->output_offset
;
2226 reloc_entry
->addend
= 0;
2230 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
2231 && (symbol
->flags
& BSF_WEAK
) != 0);
2232 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
2233 (bfd_byte
*) data
, (bfd_vma
) octets
,
2234 is_weak_undef
, error_message
);
2236 if (flag
== bfd_reloc_dangerous
)
2238 /* Add the symbol name to the error message. */
2239 if (! *error_message
)
2240 *error_message
= "";
2241 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
2242 strlen (symbol
->name
) + 17,
2244 (unsigned long) reloc_entry
->addend
);
2251 /* Set up an entry in the procedure linkage table. */
2254 elf_xtensa_create_plt_entry (struct bfd_link_info
*info
,
2256 unsigned reloc_index
)
2258 asection
*splt
, *sgotplt
;
2259 bfd_vma plt_base
, got_base
;
2260 bfd_vma code_offset
, lit_offset
, abi_offset
;
2263 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
2264 splt
= elf_xtensa_get_plt_section (info
, chunk
);
2265 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
2266 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
2268 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
2269 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
2271 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
2272 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
2274 /* Fill in the literal entry. This is the offset of the dynamic
2275 relocation entry. */
2276 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
2277 sgotplt
->contents
+ lit_offset
);
2279 /* Fill in the entry in the procedure linkage table. */
2280 memcpy (splt
->contents
+ code_offset
,
2281 (bfd_big_endian (output_bfd
)
2282 ? elf_xtensa_be_plt_entry
[XSHAL_ABI
!= XTHAL_ABI_WINDOWED
]
2283 : elf_xtensa_le_plt_entry
[XSHAL_ABI
!= XTHAL_ABI_WINDOWED
]),
2285 abi_offset
= XSHAL_ABI
== XTHAL_ABI_WINDOWED
? 3 : 0;
2286 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
2287 plt_base
+ code_offset
+ abi_offset
),
2288 splt
->contents
+ code_offset
+ abi_offset
+ 1);
2289 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
2290 plt_base
+ code_offset
+ abi_offset
+ 3),
2291 splt
->contents
+ code_offset
+ abi_offset
+ 4);
2292 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
2293 plt_base
+ code_offset
+ abi_offset
+ 6),
2294 splt
->contents
+ code_offset
+ abi_offset
+ 7);
2296 return plt_base
+ code_offset
;
2300 static bfd_boolean
get_indirect_call_dest_reg (xtensa_opcode
, unsigned *);
2303 replace_tls_insn (Elf_Internal_Rela
*rel
,
2305 asection
*input_section
,
2307 bfd_boolean is_ld_model
,
2308 char **error_message
)
2310 static xtensa_insnbuf ibuff
= NULL
;
2311 static xtensa_insnbuf sbuff
= NULL
;
2312 xtensa_isa isa
= xtensa_default_isa
;
2314 xtensa_opcode old_op
, new_op
;
2315 bfd_size_type input_size
;
2317 unsigned dest_reg
, src_reg
;
2321 ibuff
= xtensa_insnbuf_alloc (isa
);
2322 sbuff
= xtensa_insnbuf_alloc (isa
);
2325 input_size
= bfd_get_section_limit (abfd
, input_section
);
2327 /* Read the instruction into a buffer and decode the opcode. */
2328 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ rel
->r_offset
,
2329 input_size
- rel
->r_offset
);
2330 fmt
= xtensa_format_decode (isa
, ibuff
);
2331 if (fmt
== XTENSA_UNDEFINED
)
2333 *error_message
= "cannot decode instruction format";
2337 BFD_ASSERT (xtensa_format_num_slots (isa
, fmt
) == 1);
2338 xtensa_format_get_slot (isa
, fmt
, 0, ibuff
, sbuff
);
2340 old_op
= xtensa_opcode_decode (isa
, fmt
, 0, sbuff
);
2341 if (old_op
== XTENSA_UNDEFINED
)
2343 *error_message
= "cannot decode instruction opcode";
2347 r_type
= ELF32_R_TYPE (rel
->r_info
);
2350 case R_XTENSA_TLS_FUNC
:
2351 case R_XTENSA_TLS_ARG
:
2352 if (old_op
!= get_l32r_opcode ()
2353 || xtensa_operand_get_field (isa
, old_op
, 0, fmt
, 0,
2354 sbuff
, &dest_reg
) != 0)
2356 *error_message
= "cannot extract L32R destination for TLS access";
2361 case R_XTENSA_TLS_CALL
:
2362 if (! get_indirect_call_dest_reg (old_op
, &dest_reg
)
2363 || xtensa_operand_get_field (isa
, old_op
, 0, fmt
, 0,
2364 sbuff
, &src_reg
) != 0)
2366 *error_message
= "cannot extract CALLXn operands for TLS access";
2379 case R_XTENSA_TLS_FUNC
:
2380 case R_XTENSA_TLS_ARG
:
2381 /* Change the instruction to a NOP (or "OR a1, a1, a1" for older
2382 versions of Xtensa). */
2383 new_op
= xtensa_opcode_lookup (isa
, "nop");
2384 if (new_op
== XTENSA_UNDEFINED
)
2386 new_op
= xtensa_opcode_lookup (isa
, "or");
2387 if (new_op
== XTENSA_UNDEFINED
2388 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2389 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2391 || xtensa_operand_set_field (isa
, new_op
, 1, fmt
, 0,
2393 || xtensa_operand_set_field (isa
, new_op
, 2, fmt
, 0,
2396 *error_message
= "cannot encode OR for TLS access";
2402 if (xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0)
2404 *error_message
= "cannot encode NOP for TLS access";
2410 case R_XTENSA_TLS_CALL
:
2411 /* Read THREADPTR into the CALLX's return value register. */
2412 new_op
= xtensa_opcode_lookup (isa
, "rur.threadptr");
2413 if (new_op
== XTENSA_UNDEFINED
2414 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2415 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2416 sbuff
, dest_reg
+ 2) != 0)
2418 *error_message
= "cannot encode RUR.THREADPTR for TLS access";
2428 case R_XTENSA_TLS_FUNC
:
2429 new_op
= xtensa_opcode_lookup (isa
, "rur.threadptr");
2430 if (new_op
== XTENSA_UNDEFINED
2431 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2432 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2433 sbuff
, dest_reg
) != 0)
2435 *error_message
= "cannot encode RUR.THREADPTR for TLS access";
2440 case R_XTENSA_TLS_ARG
:
2441 /* Nothing to do. Keep the original L32R instruction. */
2444 case R_XTENSA_TLS_CALL
:
2445 /* Add the CALLX's src register (holding the THREADPTR value)
2446 to the first argument register (holding the offset) and put
2447 the result in the CALLX's return value register. */
2448 new_op
= xtensa_opcode_lookup (isa
, "add");
2449 if (new_op
== XTENSA_UNDEFINED
2450 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2451 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2452 sbuff
, dest_reg
+ 2) != 0
2453 || xtensa_operand_set_field (isa
, new_op
, 1, fmt
, 0,
2454 sbuff
, dest_reg
+ 2) != 0
2455 || xtensa_operand_set_field (isa
, new_op
, 2, fmt
, 0,
2456 sbuff
, src_reg
) != 0)
2458 *error_message
= "cannot encode ADD for TLS access";
2465 xtensa_format_set_slot (isa
, fmt
, 0, ibuff
, sbuff
);
2466 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ rel
->r_offset
,
2467 input_size
- rel
->r_offset
);
2473 #define IS_XTENSA_TLS_RELOC(R_TYPE) \
2474 ((R_TYPE) == R_XTENSA_TLSDESC_FN \
2475 || (R_TYPE) == R_XTENSA_TLSDESC_ARG \
2476 || (R_TYPE) == R_XTENSA_TLS_DTPOFF \
2477 || (R_TYPE) == R_XTENSA_TLS_TPOFF \
2478 || (R_TYPE) == R_XTENSA_TLS_FUNC \
2479 || (R_TYPE) == R_XTENSA_TLS_ARG \
2480 || (R_TYPE) == R_XTENSA_TLS_CALL)
2482 /* Relocate an Xtensa ELF section. This is invoked by the linker for
2483 both relocatable and final links. */
2486 elf_xtensa_relocate_section (bfd
*output_bfd
,
2487 struct bfd_link_info
*info
,
2489 asection
*input_section
,
2491 Elf_Internal_Rela
*relocs
,
2492 Elf_Internal_Sym
*local_syms
,
2493 asection
**local_sections
)
2495 struct elf_xtensa_link_hash_table
*htab
;
2496 Elf_Internal_Shdr
*symtab_hdr
;
2497 Elf_Internal_Rela
*rel
;
2498 Elf_Internal_Rela
*relend
;
2499 struct elf_link_hash_entry
**sym_hashes
;
2500 property_table_entry
*lit_table
= 0;
2502 char *local_got_tls_types
;
2503 char *error_message
= NULL
;
2504 bfd_size_type input_size
;
2507 if (!xtensa_default_isa
)
2508 xtensa_default_isa
= xtensa_isa_init (0, 0);
2510 if (!is_xtensa_elf (input_bfd
))
2512 bfd_set_error (bfd_error_wrong_format
);
2516 htab
= elf_xtensa_hash_table (info
);
2520 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2521 sym_hashes
= elf_sym_hashes (input_bfd
);
2522 local_got_tls_types
= elf_xtensa_local_got_tls_type (input_bfd
);
2524 if (elf_hash_table (info
)->dynamic_sections_created
)
2526 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
2527 &lit_table
, XTENSA_LIT_SEC_NAME
,
2533 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
2536 relend
= relocs
+ input_section
->reloc_count
;
2537 for (; rel
< relend
; rel
++)
2540 reloc_howto_type
*howto
;
2541 unsigned long r_symndx
;
2542 struct elf_link_hash_entry
*h
;
2543 Elf_Internal_Sym
*sym
;
2548 bfd_reloc_status_type r
;
2549 bfd_boolean is_weak_undef
;
2550 bfd_boolean unresolved_reloc
;
2552 bfd_boolean dynamic_symbol
;
2554 r_type
= ELF32_R_TYPE (rel
->r_info
);
2555 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
2556 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
2559 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
2561 bfd_set_error (bfd_error_bad_value
);
2564 howto
= &elf_howto_table
[r_type
];
2566 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2571 is_weak_undef
= FALSE
;
2572 unresolved_reloc
= FALSE
;
2575 if (howto
->partial_inplace
&& !bfd_link_relocatable (info
))
2577 /* Because R_XTENSA_32 was made partial_inplace to fix some
2578 problems with DWARF info in partial links, there may be
2579 an addend stored in the contents. Take it out of there
2580 and move it back into the addend field of the reloc. */
2581 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2582 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2585 if (r_symndx
< symtab_hdr
->sh_info
)
2587 sym
= local_syms
+ r_symndx
;
2588 sym_type
= ELF32_ST_TYPE (sym
->st_info
);
2589 sec
= local_sections
[r_symndx
];
2590 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2594 bfd_boolean ignored
;
2596 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2597 r_symndx
, symtab_hdr
, sym_hashes
,
2599 unresolved_reloc
, warned
, ignored
);
2602 && !unresolved_reloc
2603 && h
->root
.type
== bfd_link_hash_undefweak
)
2604 is_weak_undef
= TRUE
;
2609 if (sec
!= NULL
&& discarded_section (sec
))
2610 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2611 rel
, 1, relend
, howto
, 0, contents
);
2613 if (bfd_link_relocatable (info
))
2616 asection
* sym_sec
= get_elf_r_symndx_section (input_bfd
, r_symndx
);
2618 /* This is a relocatable link.
2619 1) If the reloc is against a section symbol, adjust
2620 according to the output section.
2621 2) If there is a new target for this relocation,
2622 the new target will be in the same output section.
2623 We adjust the relocation by the output section
2626 if (relaxing_section
)
2628 /* Check if this references a section in another input file. */
2629 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2634 dest_addr
= sym_sec
->output_section
->vma
+ sym_sec
->output_offset
2635 + get_elf_r_symndx_offset (input_bfd
, r_symndx
) + rel
->r_addend
;
2637 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2639 error_message
= NULL
;
2640 /* Convert ASM_SIMPLIFY into the simpler relocation
2641 so that they never escape a relaxing link. */
2642 r
= contract_asm_expansion (contents
, input_size
, rel
,
2644 if (r
!= bfd_reloc_ok
)
2645 (*info
->callbacks
->reloc_dangerous
)
2646 (info
, error_message
,
2647 input_bfd
, input_section
, rel
->r_offset
);
2649 r_type
= ELF32_R_TYPE (rel
->r_info
);
2652 /* This is a relocatable link, so we don't have to change
2653 anything unless the reloc is against a section symbol,
2654 in which case we have to adjust according to where the
2655 section symbol winds up in the output section. */
2656 if (r_symndx
< symtab_hdr
->sh_info
)
2658 sym
= local_syms
+ r_symndx
;
2659 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2661 sec
= local_sections
[r_symndx
];
2662 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2666 /* If there is an addend with a partial_inplace howto,
2667 then move the addend to the contents. This is a hack
2668 to work around problems with DWARF in relocatable links
2669 with some previous version of BFD. Now we can't easily get
2670 rid of the hack without breaking backward compatibility.... */
2672 howto
= &elf_howto_table
[r_type
];
2673 if (howto
->partial_inplace
&& rel
->r_addend
)
2675 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2676 rel
->r_addend
, contents
,
2677 rel
->r_offset
, FALSE
,
2683 /* Put the correct bits in the target instruction, even
2684 though the relocation will still be present in the output
2685 file. This makes disassembly clearer, as well as
2686 allowing loadable kernel modules to work without needing
2687 relocations on anything other than calls and l32r's. */
2689 /* If it is not in the same section, there is nothing we can do. */
2690 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
&&
2691 sym_sec
->output_section
== input_section
->output_section
)
2693 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2694 dest_addr
, contents
,
2695 rel
->r_offset
, FALSE
,
2699 if (r
!= bfd_reloc_ok
)
2700 (*info
->callbacks
->reloc_dangerous
)
2701 (info
, error_message
,
2702 input_bfd
, input_section
, rel
->r_offset
);
2704 /* Done with work for relocatable link; continue with next reloc. */
2708 /* This is a final link. */
2710 if (relaxing_section
)
2712 /* Check if this references a section in another input file. */
2713 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2717 /* Sanity check the address. */
2718 if (rel
->r_offset
>= input_size
2719 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2722 /* xgettext:c-format */
2723 (_("%pB(%pA+%#" PRIx64
"): "
2724 "relocation offset out of range (size=%#" PRIx64
")"),
2725 input_bfd
, input_section
, (uint64_t) rel
->r_offset
,
2726 (uint64_t) input_size
);
2727 bfd_set_error (bfd_error_bad_value
);
2732 name
= h
->root
.root
.string
;
2735 name
= (bfd_elf_string_from_elf_section
2736 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2737 if (name
== NULL
|| *name
== '\0')
2738 name
= bfd_section_name (sec
);
2741 if (r_symndx
!= STN_UNDEF
2742 && r_type
!= R_XTENSA_NONE
2744 || h
->root
.type
== bfd_link_hash_defined
2745 || h
->root
.type
== bfd_link_hash_defweak
)
2746 && IS_XTENSA_TLS_RELOC (r_type
) != (sym_type
== STT_TLS
))
2749 ((sym_type
== STT_TLS
2750 /* xgettext:c-format */
2751 ? _("%pB(%pA+%#" PRIx64
"): %s used with TLS symbol %s")
2752 /* xgettext:c-format */
2753 : _("%pB(%pA+%#" PRIx64
"): %s used with non-TLS symbol %s")),
2756 (uint64_t) rel
->r_offset
,
2761 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
2763 tls_type
= GOT_UNKNOWN
;
2765 tls_type
= elf_xtensa_hash_entry (h
)->tls_type
;
2766 else if (local_got_tls_types
)
2767 tls_type
= local_got_tls_types
[r_symndx
];
2773 if (elf_hash_table (info
)->dynamic_sections_created
2774 && (input_section
->flags
& SEC_ALLOC
) != 0
2775 && (dynamic_symbol
|| bfd_link_pic (info
)))
2777 Elf_Internal_Rela outrel
;
2781 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2782 srel
= htab
->elf
.srelplt
;
2784 srel
= htab
->elf
.srelgot
;
2786 BFD_ASSERT (srel
!= NULL
);
2789 _bfd_elf_section_offset (output_bfd
, info
,
2790 input_section
, rel
->r_offset
);
2792 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2793 memset (&outrel
, 0, sizeof outrel
);
2796 outrel
.r_offset
+= (input_section
->output_section
->vma
2797 + input_section
->output_offset
);
2799 /* Complain if the relocation is in a read-only section
2800 and not in a literal pool. */
2801 if ((input_section
->flags
& SEC_READONLY
) != 0
2802 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2806 _("dynamic relocation in read-only section");
2807 (*info
->callbacks
->reloc_dangerous
)
2808 (info
, error_message
,
2809 input_bfd
, input_section
, rel
->r_offset
);
2814 outrel
.r_addend
= rel
->r_addend
;
2817 if (r_type
== R_XTENSA_32
)
2820 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2823 else /* r_type == R_XTENSA_PLT */
2826 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2828 /* Create the PLT entry and set the initial
2829 contents of the literal entry to the address of
2832 elf_xtensa_create_plt_entry (info
, output_bfd
,
2835 unresolved_reloc
= FALSE
;
2837 else if (!is_weak_undef
)
2839 /* Generate a RELATIVE relocation. */
2840 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2841 outrel
.r_addend
= 0;
2849 loc
= (srel
->contents
2850 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2851 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2852 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2855 else if (r_type
== R_XTENSA_ASM_EXPAND
&& dynamic_symbol
)
2857 /* This should only happen for non-PIC code, which is not
2858 supposed to be used on systems with dynamic linking.
2859 Just ignore these relocations. */
2864 case R_XTENSA_TLS_TPOFF
:
2865 /* Switch to LE model for local symbols in an executable. */
2866 if (! bfd_link_pic (info
) && ! dynamic_symbol
)
2868 relocation
= tpoff (info
, relocation
);
2873 case R_XTENSA_TLSDESC_FN
:
2874 case R_XTENSA_TLSDESC_ARG
:
2876 if (r_type
== R_XTENSA_TLSDESC_FN
)
2878 if (! bfd_link_pic (info
) || (tls_type
& GOT_TLS_IE
) != 0)
2879 r_type
= R_XTENSA_NONE
;
2881 else if (r_type
== R_XTENSA_TLSDESC_ARG
)
2883 if (bfd_link_pic (info
))
2885 if ((tls_type
& GOT_TLS_IE
) != 0)
2886 r_type
= R_XTENSA_TLS_TPOFF
;
2890 r_type
= R_XTENSA_TLS_TPOFF
;
2891 if (! dynamic_symbol
)
2893 relocation
= tpoff (info
, relocation
);
2899 if (r_type
== R_XTENSA_NONE
)
2900 /* Nothing to do here; skip to the next reloc. */
2903 if (! elf_hash_table (info
)->dynamic_sections_created
)
2906 _("TLS relocation invalid without dynamic sections");
2907 (*info
->callbacks
->reloc_dangerous
)
2908 (info
, error_message
,
2909 input_bfd
, input_section
, rel
->r_offset
);
2913 Elf_Internal_Rela outrel
;
2915 asection
*srel
= htab
->elf
.srelgot
;
2918 outrel
.r_offset
= (input_section
->output_section
->vma
2919 + input_section
->output_offset
2922 /* Complain if the relocation is in a read-only section
2923 and not in a literal pool. */
2924 if ((input_section
->flags
& SEC_READONLY
) != 0
2925 && ! elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2929 _("dynamic relocation in read-only section");
2930 (*info
->callbacks
->reloc_dangerous
)
2931 (info
, error_message
,
2932 input_bfd
, input_section
, rel
->r_offset
);
2935 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2937 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2939 outrel
.r_addend
= 0;
2942 outrel
.r_info
= ELF32_R_INFO (indx
, r_type
);
2944 unresolved_reloc
= FALSE
;
2947 loc
= (srel
->contents
2948 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2949 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2950 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2956 case R_XTENSA_TLS_DTPOFF
:
2957 if (! bfd_link_pic (info
))
2958 /* Switch from LD model to LE model. */
2959 relocation
= tpoff (info
, relocation
);
2961 relocation
-= dtpoff_base (info
);
2964 case R_XTENSA_TLS_FUNC
:
2965 case R_XTENSA_TLS_ARG
:
2966 case R_XTENSA_TLS_CALL
:
2967 /* Check if optimizing to IE or LE model. */
2968 if ((tls_type
& GOT_TLS_IE
) != 0)
2970 bfd_boolean is_ld_model
=
2971 (h
&& elf_xtensa_hash_entry (h
) == htab
->tlsbase
);
2972 if (! replace_tls_insn (rel
, input_bfd
, input_section
, contents
,
2973 is_ld_model
, &error_message
))
2974 (*info
->callbacks
->reloc_dangerous
)
2975 (info
, error_message
,
2976 input_bfd
, input_section
, rel
->r_offset
);
2978 if (r_type
!= R_XTENSA_TLS_ARG
|| is_ld_model
)
2980 /* Skip subsequent relocations on the same instruction. */
2981 while (rel
+ 1 < relend
&& rel
[1].r_offset
== rel
->r_offset
)
2988 if (elf_hash_table (info
)->dynamic_sections_created
2989 && dynamic_symbol
&& (is_operand_relocation (r_type
)
2990 || r_type
== R_XTENSA_32_PCREL
))
2993 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
2994 strlen (name
) + 2, name
);
2995 (*info
->callbacks
->reloc_dangerous
)
2996 (info
, error_message
, input_bfd
, input_section
, rel
->r_offset
);
3002 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3003 because such sections are not SEC_ALLOC and thus ld.so will
3004 not process them. */
3005 if (unresolved_reloc
3006 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3008 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3009 rel
->r_offset
) != (bfd_vma
) -1)
3012 /* xgettext:c-format */
3013 (_("%pB(%pA+%#" PRIx64
"): "
3014 "unresolvable %s relocation against symbol `%s'"),
3017 (uint64_t) rel
->r_offset
,
3023 /* TLS optimizations may have changed r_type; update "howto". */
3024 howto
= &elf_howto_table
[r_type
];
3026 /* There's no point in calling bfd_perform_relocation here.
3027 Just go directly to our "special function". */
3028 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
3029 relocation
+ rel
->r_addend
,
3030 contents
, rel
->r_offset
, is_weak_undef
,
3033 if (r
!= bfd_reloc_ok
&& !warned
)
3035 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
3036 BFD_ASSERT (error_message
!= NULL
);
3038 if (rel
->r_addend
== 0)
3039 error_message
= vsprint_msg (error_message
, ": %s",
3040 strlen (name
) + 2, name
);
3042 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
3044 name
, (int) rel
->r_addend
);
3046 (*info
->callbacks
->reloc_dangerous
)
3047 (info
, error_message
, input_bfd
, input_section
, rel
->r_offset
);
3052 input_section
->reloc_done
= TRUE
;
3058 /* Finish up dynamic symbol handling. There's not much to do here since
3059 the PLT and GOT entries are all set up by relocate_section. */
3062 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
3063 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3064 struct elf_link_hash_entry
*h
,
3065 Elf_Internal_Sym
*sym
)
3067 if (h
->needs_plt
&& !h
->def_regular
)
3069 /* Mark the symbol as undefined, rather than as defined in
3070 the .plt section. Leave the value alone. */
3071 sym
->st_shndx
= SHN_UNDEF
;
3072 /* If the symbol is weak, we do need to clear the value.
3073 Otherwise, the PLT entry would provide a definition for
3074 the symbol even if the symbol wasn't defined anywhere,
3075 and so the symbol would never be NULL. */
3076 if (!h
->ref_regular_nonweak
)
3080 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3081 if (h
== elf_hash_table (info
)->hdynamic
3082 || h
== elf_hash_table (info
)->hgot
)
3083 sym
->st_shndx
= SHN_ABS
;
3089 /* Combine adjacent literal table entries in the output. Adjacent
3090 entries within each input section may have been removed during
3091 relaxation, but we repeat the process here, even though it's too late
3092 to shrink the output section, because it's important to minimize the
3093 number of literal table entries to reduce the start-up work for the
3094 runtime linker. Returns the number of remaining table entries or -1
3098 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
3103 property_table_entry
*table
;
3104 bfd_size_type section_size
, sgotloc_size
;
3108 section_size
= sxtlit
->size
;
3109 BFD_ASSERT (section_size
% 8 == 0);
3110 num
= section_size
/ 8;
3112 sgotloc_size
= sgotloc
->size
;
3113 if (sgotloc_size
!= section_size
)
3116 (_("internal inconsistency in size of .got.loc section"));
3120 table
= bfd_malloc (num
* sizeof (property_table_entry
));
3124 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
3125 propagates to the output section, where it doesn't really apply and
3126 where it breaks the following call to bfd_malloc_and_get_section. */
3127 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
3129 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
3136 /* There should never be any relocations left at this point, so this
3137 is quite a bit easier than what is done during relaxation. */
3139 /* Copy the raw contents into a property table array and sort it. */
3141 for (n
= 0; n
< num
; n
++)
3143 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
3144 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
3147 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
3149 for (n
= 0; n
< num
; n
++)
3151 bfd_boolean remove_entry
= FALSE
;
3153 if (table
[n
].size
== 0)
3154 remove_entry
= TRUE
;
3156 && (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
3158 table
[n
-1].size
+= table
[n
].size
;
3159 remove_entry
= TRUE
;
3164 for (m
= n
; m
< num
- 1; m
++)
3166 table
[m
].address
= table
[m
+1].address
;
3167 table
[m
].size
= table
[m
+1].size
;
3175 /* Copy the data back to the raw contents. */
3177 for (n
= 0; n
< num
; n
++)
3179 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
3180 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
3184 /* Clear the removed bytes. */
3185 if ((bfd_size_type
) (num
* 8) < section_size
)
3186 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
3188 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
3192 /* Copy the contents to ".got.loc". */
3193 memcpy (sgotloc
->contents
, contents
, section_size
);
3201 /* Finish up the dynamic sections. */
3204 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
3205 struct bfd_link_info
*info
)
3207 struct elf_xtensa_link_hash_table
*htab
;
3209 asection
*sdyn
, *srelplt
, *srelgot
, *sgot
, *sxtlit
, *sgotloc
;
3210 Elf32_External_Dyn
*dyncon
, *dynconend
;
3211 int num_xtlit_entries
= 0;
3213 if (! elf_hash_table (info
)->dynamic_sections_created
)
3216 htab
= elf_xtensa_hash_table (info
);
3220 dynobj
= elf_hash_table (info
)->dynobj
;
3221 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3222 BFD_ASSERT (sdyn
!= NULL
);
3224 /* Set the first entry in the global offset table to the address of
3225 the dynamic section. */
3226 sgot
= htab
->elf
.sgot
;
3229 BFD_ASSERT (sgot
->size
== 4);
3231 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
3233 bfd_put_32 (output_bfd
,
3234 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3238 srelplt
= htab
->elf
.srelplt
;
3239 srelgot
= htab
->elf
.srelgot
;
3240 if (srelplt
&& srelplt
->size
!= 0)
3242 asection
*sgotplt
, *spltlittbl
;
3243 int chunk
, plt_chunks
, plt_entries
;
3244 Elf_Internal_Rela irela
;
3246 unsigned rtld_reloc
;
3248 spltlittbl
= htab
->spltlittbl
;
3249 BFD_ASSERT (srelgot
!= NULL
&& spltlittbl
!= NULL
);
3251 /* Find the first XTENSA_RTLD relocation. Presumably the rest
3252 of them follow immediately after.... */
3253 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
3255 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
3256 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3257 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
3260 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
3262 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
3264 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
3266 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
3268 int chunk_entries
= 0;
3270 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
3271 BFD_ASSERT (sgotplt
!= NULL
);
3273 /* Emit special RTLD relocations for the first two entries in
3274 each chunk of the .got.plt section. */
3276 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
3277 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3278 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
3279 irela
.r_offset
= (sgotplt
->output_section
->vma
3280 + sgotplt
->output_offset
);
3281 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
3282 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
3284 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
3286 /* Next literal immediately follows the first. */
3287 loc
+= sizeof (Elf32_External_Rela
);
3288 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3289 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
3290 irela
.r_offset
= (sgotplt
->output_section
->vma
3291 + sgotplt
->output_offset
+ 4);
3292 /* Tell rtld to set value to object's link map. */
3294 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
3296 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
3298 /* Fill in the literal table. */
3299 if (chunk
< plt_chunks
- 1)
3300 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
3302 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
3304 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
3305 bfd_put_32 (output_bfd
,
3306 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
3307 spltlittbl
->contents
+ (chunk
* 8) + 0);
3308 bfd_put_32 (output_bfd
,
3309 8 + (chunk_entries
* 4),
3310 spltlittbl
->contents
+ (chunk
* 8) + 4);
3313 /* The .xt.lit.plt section has just been modified. This must
3314 happen before the code below which combines adjacent literal
3315 table entries, and the .xt.lit.plt contents have to be forced to
3317 if (! bfd_set_section_contents (output_bfd
,
3318 spltlittbl
->output_section
,
3319 spltlittbl
->contents
,
3320 spltlittbl
->output_offset
,
3323 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
3324 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
3327 /* All the dynamic relocations have been emitted at this point.
3328 Make sure the relocation sections are the correct size. */
3329 if ((srelgot
&& srelgot
->size
!= (sizeof (Elf32_External_Rela
)
3330 * srelgot
->reloc_count
))
3331 || (srelplt
&& srelplt
->size
!= (sizeof (Elf32_External_Rela
)
3332 * srelplt
->reloc_count
)))
3335 /* Combine adjacent literal table entries. */
3336 BFD_ASSERT (! bfd_link_relocatable (info
));
3337 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
3338 sgotloc
= htab
->sgotloc
;
3339 BFD_ASSERT (sgotloc
);
3343 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
3344 if (num_xtlit_entries
< 0)
3348 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3349 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3350 for (; dyncon
< dynconend
; dyncon
++)
3352 Elf_Internal_Dyn dyn
;
3354 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3361 case DT_XTENSA_GOT_LOC_SZ
:
3362 dyn
.d_un
.d_val
= num_xtlit_entries
;
3365 case DT_XTENSA_GOT_LOC_OFF
:
3366 dyn
.d_un
.d_ptr
= (htab
->sgotloc
->output_section
->vma
3367 + htab
->sgotloc
->output_offset
);
3371 dyn
.d_un
.d_ptr
= (htab
->elf
.sgot
->output_section
->vma
3372 + htab
->elf
.sgot
->output_offset
);
3376 dyn
.d_un
.d_ptr
= (htab
->elf
.srelplt
->output_section
->vma
3377 + htab
->elf
.srelplt
->output_offset
);
3381 dyn
.d_un
.d_val
= htab
->elf
.srelplt
->size
;
3385 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3392 /* Functions for dealing with the e_flags field. */
3394 /* Merge backend specific data from an object file to the output
3395 object file when linking. */
3398 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, struct bfd_link_info
*info
)
3400 bfd
*obfd
= info
->output_bfd
;
3401 unsigned out_mach
, in_mach
;
3402 flagword out_flag
, in_flag
;
3404 /* Check if we have the same endianness. */
3405 if (!_bfd_generic_verify_endian_match (ibfd
, info
))
3408 /* Don't even pretend to support mixed-format linking. */
3409 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
3410 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
3413 out_flag
= elf_elfheader (obfd
)->e_flags
;
3414 in_flag
= elf_elfheader (ibfd
)->e_flags
;
3416 out_mach
= out_flag
& EF_XTENSA_MACH
;
3417 in_mach
= in_flag
& EF_XTENSA_MACH
;
3418 if (out_mach
!= in_mach
)
3421 /* xgettext:c-format */
3422 (_("%pB: incompatible machine type; output is 0x%x; input is 0x%x"),
3423 ibfd
, out_mach
, in_mach
);
3424 bfd_set_error (bfd_error_wrong_format
);
3428 if (! elf_flags_init (obfd
))
3430 elf_flags_init (obfd
) = TRUE
;
3431 elf_elfheader (obfd
)->e_flags
= in_flag
;
3433 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
3434 && bfd_get_arch_info (obfd
)->the_default
)
3435 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
3436 bfd_get_mach (ibfd
));
3441 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
3442 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
3444 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
3445 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
3452 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
3454 BFD_ASSERT (!elf_flags_init (abfd
)
3455 || elf_elfheader (abfd
)->e_flags
== flags
);
3457 elf_elfheader (abfd
)->e_flags
|= flags
;
3458 elf_flags_init (abfd
) = TRUE
;
3465 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
3467 FILE *f
= (FILE *) farg
;
3468 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
3470 fprintf (f
, "\nXtensa header:\n");
3471 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
3472 fprintf (f
, "\nMachine = Base\n");
3474 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
3476 fprintf (f
, "Insn tables = %s\n",
3477 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
3479 fprintf (f
, "Literal tables = %s\n",
3480 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
3482 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
3486 /* Set the right machine number for an Xtensa ELF file. */
3489 elf_xtensa_object_p (bfd
*abfd
)
3492 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
3497 mach
= bfd_mach_xtensa
;
3503 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
3508 /* The final processing done just before writing out an Xtensa ELF object
3509 file. This gets the Xtensa architecture right based on the machine
3513 elf_xtensa_final_write_processing (bfd
*abfd
)
3516 unsigned long val
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
3518 switch (mach
= bfd_get_mach (abfd
))
3520 case bfd_mach_xtensa
:
3521 val
= E_XTENSA_MACH
;
3527 elf_elfheader (abfd
)->e_flags
&= ~EF_XTENSA_MACH
;
3528 elf_elfheader (abfd
)->e_flags
|= val
;
3529 return _bfd_elf_final_write_processing (abfd
);
3533 static enum elf_reloc_type_class
3534 elf_xtensa_reloc_type_class (const struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3535 const asection
*rel_sec ATTRIBUTE_UNUSED
,
3536 const Elf_Internal_Rela
*rela
)
3538 switch ((int) ELF32_R_TYPE (rela
->r_info
))
3540 case R_XTENSA_RELATIVE
:
3541 return reloc_class_relative
;
3542 case R_XTENSA_JMP_SLOT
:
3543 return reloc_class_plt
;
3545 return reloc_class_normal
;
3551 elf_xtensa_discard_info_for_section (bfd
*abfd
,
3552 struct elf_reloc_cookie
*cookie
,
3553 struct bfd_link_info
*info
,
3557 bfd_vma offset
, actual_offset
;
3558 bfd_size_type removed_bytes
= 0;
3559 bfd_size_type entry_size
;
3561 if (sec
->output_section
3562 && bfd_is_abs_section (sec
->output_section
))
3565 if (xtensa_is_proptable_section (sec
))
3570 if (sec
->size
== 0 || sec
->size
% entry_size
!= 0)
3573 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
3577 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
3580 release_contents (sec
, contents
);
3584 /* Sort the relocations. They should already be in order when
3585 relaxation is enabled, but it might not be. */
3586 qsort (cookie
->rels
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
3587 internal_reloc_compare
);
3589 cookie
->rel
= cookie
->rels
;
3590 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
3592 for (offset
= 0; offset
< sec
->size
; offset
+= entry_size
)
3594 actual_offset
= offset
- removed_bytes
;
3596 /* The ...symbol_deleted_p function will skip over relocs but it
3597 won't adjust their offsets, so do that here. */
3598 while (cookie
->rel
< cookie
->relend
3599 && cookie
->rel
->r_offset
< offset
)
3601 cookie
->rel
->r_offset
-= removed_bytes
;
3605 while (cookie
->rel
< cookie
->relend
3606 && cookie
->rel
->r_offset
== offset
)
3608 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
3610 /* Remove the table entry. (If the reloc type is NONE, then
3611 the entry has already been merged with another and deleted
3612 during relaxation.) */
3613 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
3615 /* Shift the contents up. */
3616 if (offset
+ entry_size
< sec
->size
)
3617 memmove (&contents
[actual_offset
],
3618 &contents
[actual_offset
+ entry_size
],
3619 sec
->size
- offset
- entry_size
);
3620 removed_bytes
+= entry_size
;
3623 /* Remove this relocation. */
3624 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
3627 /* Adjust the relocation offset for previous removals. This
3628 should not be done before calling ...symbol_deleted_p
3629 because it might mess up the offset comparisons there.
3630 Make sure the offset doesn't underflow in the case where
3631 the first entry is removed. */
3632 if (cookie
->rel
->r_offset
>= removed_bytes
)
3633 cookie
->rel
->r_offset
-= removed_bytes
;
3635 cookie
->rel
->r_offset
= 0;
3641 if (removed_bytes
!= 0)
3643 /* Adjust any remaining relocs (shouldn't be any). */
3644 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
3646 if (cookie
->rel
->r_offset
>= removed_bytes
)
3647 cookie
->rel
->r_offset
-= removed_bytes
;
3649 cookie
->rel
->r_offset
= 0;
3652 /* Clear the removed bytes. */
3653 memset (&contents
[sec
->size
- removed_bytes
], 0, removed_bytes
);
3655 pin_contents (sec
, contents
);
3656 pin_internal_relocs (sec
, cookie
->rels
);
3659 if (sec
->rawsize
== 0)
3660 sec
->rawsize
= sec
->size
;
3661 sec
->size
-= removed_bytes
;
3663 if (xtensa_is_littable_section (sec
))
3665 asection
*sgotloc
= elf_xtensa_hash_table (info
)->sgotloc
;
3667 sgotloc
->size
-= removed_bytes
;
3672 release_contents (sec
, contents
);
3673 release_internal_relocs (sec
, cookie
->rels
);
3676 return (removed_bytes
!= 0);
3681 elf_xtensa_discard_info (bfd
*abfd
,
3682 struct elf_reloc_cookie
*cookie
,
3683 struct bfd_link_info
*info
)
3686 bfd_boolean changed
= FALSE
;
3688 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3690 if (xtensa_is_property_section (sec
))
3692 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
3702 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
3704 return xtensa_is_property_section (sec
);
3709 elf_xtensa_action_discarded (asection
*sec
)
3711 if (strcmp (".xt_except_table", sec
->name
) == 0)
3714 if (strcmp (".xt_except_desc", sec
->name
) == 0)
3717 return _bfd_elf_default_action_discarded (sec
);
3721 /* Support for core dump NOTE sections. */
3724 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
3729 /* The size for Xtensa is variable, so don't try to recognize the format
3730 based on the size. Just assume this is GNU/Linux. */
3733 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
3736 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
3740 size
= note
->descsz
- offset
- 4;
3742 /* Make a ".reg/999" section. */
3743 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
3744 size
, note
->descpos
+ offset
);
3749 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
3751 switch (note
->descsz
)
3756 case 128: /* GNU/Linux elf_prpsinfo */
3757 elf_tdata (abfd
)->core
->program
3758 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
3759 elf_tdata (abfd
)->core
->command
3760 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
3763 /* Note that for some reason, a spurious space is tacked
3764 onto the end of the args in some (at least one anyway)
3765 implementations, so strip it off if it exists. */
3768 char *command
= elf_tdata (abfd
)->core
->command
;
3769 int n
= strlen (command
);
3771 if (0 < n
&& command
[n
- 1] == ' ')
3772 command
[n
- 1] = '\0';
3779 /* Generic Xtensa configurability stuff. */
3781 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3782 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3783 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3784 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3785 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3786 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3787 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3788 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3791 init_call_opcodes (void)
3793 if (callx0_op
== XTENSA_UNDEFINED
)
3795 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3796 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3797 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3798 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3799 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3800 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3801 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3802 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3808 is_indirect_call_opcode (xtensa_opcode opcode
)
3810 init_call_opcodes ();
3811 return (opcode
== callx0_op
3812 || opcode
== callx4_op
3813 || opcode
== callx8_op
3814 || opcode
== callx12_op
);
3819 is_direct_call_opcode (xtensa_opcode opcode
)
3821 init_call_opcodes ();
3822 return (opcode
== call0_op
3823 || opcode
== call4_op
3824 || opcode
== call8_op
3825 || opcode
== call12_op
);
3830 is_windowed_call_opcode (xtensa_opcode opcode
)
3832 init_call_opcodes ();
3833 return (opcode
== call4_op
3834 || opcode
== call8_op
3835 || opcode
== call12_op
3836 || opcode
== callx4_op
3837 || opcode
== callx8_op
3838 || opcode
== callx12_op
);
3843 get_indirect_call_dest_reg (xtensa_opcode opcode
, unsigned *pdst
)
3845 unsigned dst
= (unsigned) -1;
3847 init_call_opcodes ();
3848 if (opcode
== callx0_op
)
3850 else if (opcode
== callx4_op
)
3852 else if (opcode
== callx8_op
)
3854 else if (opcode
== callx12_op
)
3857 if (dst
== (unsigned) -1)
3865 static xtensa_opcode
3866 get_const16_opcode (void)
3868 static bfd_boolean done_lookup
= FALSE
;
3869 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3872 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3875 return const16_opcode
;
3879 static xtensa_opcode
3880 get_l32r_opcode (void)
3882 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3883 static bfd_boolean done_lookup
= FALSE
;
3887 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3895 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3899 offset
= addr
- ((pc
+3) & -4);
3900 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3901 offset
= (signed int) offset
>> 2;
3902 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3907 static xtensa_opcode
3908 get_rsr_lend_opcode (void)
3910 static xtensa_opcode rsr_lend_opcode
= XTENSA_UNDEFINED
;
3911 static bfd_boolean done_lookup
= FALSE
;
3914 rsr_lend_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "rsr.lend");
3917 return rsr_lend_opcode
;
3920 static xtensa_opcode
3921 get_wsr_lbeg_opcode (void)
3923 static xtensa_opcode wsr_lbeg_opcode
= XTENSA_UNDEFINED
;
3924 static bfd_boolean done_lookup
= FALSE
;
3927 wsr_lbeg_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "wsr.lbeg");
3930 return wsr_lbeg_opcode
;
3935 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3937 xtensa_isa isa
= xtensa_default_isa
;
3938 int last_immed
, last_opnd
, opi
;
3940 if (opcode
== XTENSA_UNDEFINED
)
3941 return XTENSA_UNDEFINED
;
3943 /* Find the last visible PC-relative immediate operand for the opcode.
3944 If there are no PC-relative immediates, then choose the last visible
3945 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3946 last_immed
= XTENSA_UNDEFINED
;
3947 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3948 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3950 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3952 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3957 if (last_immed
== XTENSA_UNDEFINED
3958 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3962 return XTENSA_UNDEFINED
;
3964 /* If the operand number was specified in an old-style relocation,
3965 check for consistency with the operand computed above. */
3966 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
3968 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
3969 if (reloc_opnd
!= last_immed
)
3970 return XTENSA_UNDEFINED
;
3978 get_relocation_slot (int r_type
)
3988 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3989 return r_type
- R_XTENSA_SLOT0_OP
;
3990 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3991 return r_type
- R_XTENSA_SLOT0_ALT
;
3995 return XTENSA_UNDEFINED
;
3999 /* Get the opcode for a relocation. */
4001 static xtensa_opcode
4002 get_relocation_opcode (bfd
*abfd
,
4005 Elf_Internal_Rela
*irel
)
4007 static xtensa_insnbuf ibuff
= NULL
;
4008 static xtensa_insnbuf sbuff
= NULL
;
4009 xtensa_isa isa
= xtensa_default_isa
;
4013 if (contents
== NULL
)
4014 return XTENSA_UNDEFINED
;
4016 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
4017 return XTENSA_UNDEFINED
;
4021 ibuff
= xtensa_insnbuf_alloc (isa
);
4022 sbuff
= xtensa_insnbuf_alloc (isa
);
4025 /* Decode the instruction. */
4026 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
4027 sec
->size
- irel
->r_offset
);
4028 fmt
= xtensa_format_decode (isa
, ibuff
);
4029 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
4030 if (slot
== XTENSA_UNDEFINED
)
4031 return XTENSA_UNDEFINED
;
4032 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
4033 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
4038 is_l32r_relocation (bfd
*abfd
,
4041 Elf_Internal_Rela
*irel
)
4043 xtensa_opcode opcode
;
4044 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
4046 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
4047 return (opcode
== get_l32r_opcode ());
4051 static bfd_size_type
4052 get_asm_simplify_size (bfd_byte
*contents
,
4053 bfd_size_type content_len
,
4054 bfd_size_type offset
)
4056 bfd_size_type insnlen
, size
= 0;
4058 /* Decode the size of the next two instructions. */
4059 insnlen
= insn_decode_len (contents
, content_len
, offset
);
4065 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
4075 is_alt_relocation (int r_type
)
4077 return (r_type
>= R_XTENSA_SLOT0_ALT
4078 && r_type
<= R_XTENSA_SLOT14_ALT
);
4083 is_operand_relocation (int r_type
)
4093 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
4095 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
4104 #define MIN_INSN_LENGTH 2
4106 /* Return 0 if it fails to decode. */
4109 insn_decode_len (bfd_byte
*contents
,
4110 bfd_size_type content_len
,
4111 bfd_size_type offset
)
4114 xtensa_isa isa
= xtensa_default_isa
;
4116 static xtensa_insnbuf ibuff
= NULL
;
4118 if (offset
+ MIN_INSN_LENGTH
> content_len
)
4122 ibuff
= xtensa_insnbuf_alloc (isa
);
4123 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
4124 content_len
- offset
);
4125 fmt
= xtensa_format_decode (isa
, ibuff
);
4126 if (fmt
== XTENSA_UNDEFINED
)
4128 insn_len
= xtensa_format_length (isa
, fmt
);
4129 if (insn_len
== XTENSA_UNDEFINED
)
4135 insn_num_slots (bfd_byte
*contents
,
4136 bfd_size_type content_len
,
4137 bfd_size_type offset
)
4139 xtensa_isa isa
= xtensa_default_isa
;
4141 static xtensa_insnbuf ibuff
= NULL
;
4143 if (offset
+ MIN_INSN_LENGTH
> content_len
)
4144 return XTENSA_UNDEFINED
;
4147 ibuff
= xtensa_insnbuf_alloc (isa
);
4148 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
4149 content_len
- offset
);
4150 fmt
= xtensa_format_decode (isa
, ibuff
);
4151 if (fmt
== XTENSA_UNDEFINED
)
4152 return XTENSA_UNDEFINED
;
4153 return xtensa_format_num_slots (isa
, fmt
);
4157 /* Decode the opcode for a single slot instruction.
4158 Return 0 if it fails to decode or the instruction is multi-slot. */
4161 insn_decode_opcode (bfd_byte
*contents
,
4162 bfd_size_type content_len
,
4163 bfd_size_type offset
,
4166 xtensa_isa isa
= xtensa_default_isa
;
4168 static xtensa_insnbuf insnbuf
= NULL
;
4169 static xtensa_insnbuf slotbuf
= NULL
;
4171 if (offset
+ MIN_INSN_LENGTH
> content_len
)
4172 return XTENSA_UNDEFINED
;
4174 if (insnbuf
== NULL
)
4176 insnbuf
= xtensa_insnbuf_alloc (isa
);
4177 slotbuf
= xtensa_insnbuf_alloc (isa
);
4180 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4181 content_len
- offset
);
4182 fmt
= xtensa_format_decode (isa
, insnbuf
);
4183 if (fmt
== XTENSA_UNDEFINED
)
4184 return XTENSA_UNDEFINED
;
4186 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
4187 return XTENSA_UNDEFINED
;
4189 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
4190 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
4194 /* The offset is the offset in the contents.
4195 The address is the address of that offset. */
4198 check_branch_target_aligned (bfd_byte
*contents
,
4199 bfd_size_type content_length
,
4203 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
4206 return check_branch_target_aligned_address (address
, insn_len
);
4211 check_loop_aligned (bfd_byte
*contents
,
4212 bfd_size_type content_length
,
4216 bfd_size_type loop_len
, insn_len
;
4217 xtensa_opcode opcode
;
4219 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
4220 if (opcode
== XTENSA_UNDEFINED
4221 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
4227 loop_len
= insn_decode_len (contents
, content_length
, offset
);
4228 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
4229 if (loop_len
== 0 || insn_len
== 0)
4235 /* If this is relaxed loop, analyze first instruction of the actual loop
4236 body. It must be at offset 27 from the loop instruction address. */
4238 && insn_num_slots (contents
, content_length
, offset
+ loop_len
) == 1
4239 && insn_decode_opcode (contents
, content_length
,
4240 offset
+ loop_len
, 0) == get_rsr_lend_opcode()
4241 && insn_decode_len (contents
, content_length
, offset
+ loop_len
+ 3) == 3
4242 && insn_num_slots (contents
, content_length
, offset
+ loop_len
+ 3) == 1
4243 && insn_decode_opcode (contents
, content_length
,
4244 offset
+ loop_len
+ 3, 0) == get_wsr_lbeg_opcode())
4247 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
4249 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
4254 check_branch_target_aligned_address (bfd_vma addr
, int len
)
4257 return (addr
% 8 == 0);
4258 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
4262 /* Instruction widening and narrowing. */
4264 /* When FLIX is available we need to access certain instructions only
4265 when they are 16-bit or 24-bit instructions. This table caches
4266 information about such instructions by walking through all the
4267 opcodes and finding the smallest single-slot format into which each
4270 static xtensa_format
*op_single_fmt_table
= NULL
;
4274 init_op_single_format_table (void)
4276 xtensa_isa isa
= xtensa_default_isa
;
4277 xtensa_insnbuf ibuf
;
4278 xtensa_opcode opcode
;
4282 if (op_single_fmt_table
)
4285 ibuf
= xtensa_insnbuf_alloc (isa
);
4286 num_opcodes
= xtensa_isa_num_opcodes (isa
);
4288 op_single_fmt_table
= (xtensa_format
*)
4289 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
4290 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
4292 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
4293 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
4295 if (xtensa_format_num_slots (isa
, fmt
) == 1
4296 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
4298 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
4299 int fmt_length
= xtensa_format_length (isa
, fmt
);
4300 if (old_fmt
== XTENSA_UNDEFINED
4301 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
4302 op_single_fmt_table
[opcode
] = fmt
;
4306 xtensa_insnbuf_free (isa
, ibuf
);
4310 static xtensa_format
4311 get_single_format (xtensa_opcode opcode
)
4313 init_op_single_format_table ();
4314 return op_single_fmt_table
[opcode
];
4318 /* For the set of narrowable instructions we do NOT include the
4319 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
4320 involved during linker relaxation that may require these to
4321 re-expand in some conditions. Also, the narrowing "or" -> mov.n
4322 requires special case code to ensure it only works when op1 == op2. */
4330 struct string_pair narrowable
[] =
4333 { "addi", "addi.n" },
4334 { "addmi", "addi.n" },
4335 { "l32i", "l32i.n" },
4336 { "movi", "movi.n" },
4338 { "retw", "retw.n" },
4339 { "s32i", "s32i.n" },
4340 { "or", "mov.n" } /* special case only when op1 == op2 */
4343 struct string_pair widenable
[] =
4346 { "addi", "addi.n" },
4347 { "addmi", "addi.n" },
4348 { "beqz", "beqz.n" },
4349 { "bnez", "bnez.n" },
4350 { "l32i", "l32i.n" },
4351 { "movi", "movi.n" },
4353 { "retw", "retw.n" },
4354 { "s32i", "s32i.n" },
4355 { "or", "mov.n" } /* special case only when op1 == op2 */
4359 /* Check if an instruction can be "narrowed", i.e., changed from a standard
4360 3-byte instruction to a 2-byte "density" instruction. If it is valid,
4361 return the instruction buffer holding the narrow instruction. Otherwise,
4362 return 0. The set of valid narrowing are specified by a string table
4363 but require some special case operand checks in some cases. */
4365 static xtensa_insnbuf
4366 can_narrow_instruction (xtensa_insnbuf slotbuf
,
4368 xtensa_opcode opcode
)
4370 xtensa_isa isa
= xtensa_default_isa
;
4371 xtensa_format o_fmt
;
4374 static xtensa_insnbuf o_insnbuf
= NULL
;
4375 static xtensa_insnbuf o_slotbuf
= NULL
;
4377 if (o_insnbuf
== NULL
)
4379 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
4380 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
4383 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
4385 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
4387 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
4389 uint32 value
, newval
;
4390 int i
, operand_count
, o_operand_count
;
4391 xtensa_opcode o_opcode
;
4393 /* Address does not matter in this case. We might need to
4394 fix it to handle branches/jumps. */
4395 bfd_vma self_address
= 0;
4397 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
4398 if (o_opcode
== XTENSA_UNDEFINED
)
4400 o_fmt
= get_single_format (o_opcode
);
4401 if (o_fmt
== XTENSA_UNDEFINED
)
4404 if (xtensa_format_length (isa
, fmt
) != 3
4405 || xtensa_format_length (isa
, o_fmt
) != 2)
4408 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
4409 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
4410 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
4412 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
4417 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
4422 uint32 rawval0
, rawval1
, rawval2
;
4424 if (o_operand_count
+ 1 != operand_count
4425 || xtensa_operand_get_field (isa
, opcode
, 0,
4426 fmt
, 0, slotbuf
, &rawval0
) != 0
4427 || xtensa_operand_get_field (isa
, opcode
, 1,
4428 fmt
, 0, slotbuf
, &rawval1
) != 0
4429 || xtensa_operand_get_field (isa
, opcode
, 2,
4430 fmt
, 0, slotbuf
, &rawval2
) != 0
4431 || rawval1
!= rawval2
4432 || rawval0
== rawval1
/* it is a nop */)
4436 for (i
= 0; i
< o_operand_count
; ++i
)
4438 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
4440 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
4443 /* PC-relative branches need adjustment, but
4444 the PC-rel operand will always have a relocation. */
4446 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
4448 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
4449 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
4454 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
4464 /* Attempt to narrow an instruction. If the narrowing is valid, perform
4465 the action in-place directly into the contents and return TRUE. Otherwise,
4466 the return value is FALSE and the contents are not modified. */
4469 narrow_instruction (bfd_byte
*contents
,
4470 bfd_size_type content_length
,
4471 bfd_size_type offset
)
4473 xtensa_opcode opcode
;
4474 bfd_size_type insn_len
;
4475 xtensa_isa isa
= xtensa_default_isa
;
4477 xtensa_insnbuf o_insnbuf
;
4479 static xtensa_insnbuf insnbuf
= NULL
;
4480 static xtensa_insnbuf slotbuf
= NULL
;
4482 if (insnbuf
== NULL
)
4484 insnbuf
= xtensa_insnbuf_alloc (isa
);
4485 slotbuf
= xtensa_insnbuf_alloc (isa
);
4488 BFD_ASSERT (offset
< content_length
);
4490 if (content_length
< 2)
4493 /* We will hand-code a few of these for a little while.
4494 These have all been specified in the assembler aleady. */
4495 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4496 content_length
- offset
);
4497 fmt
= xtensa_format_decode (isa
, insnbuf
);
4498 if (xtensa_format_num_slots (isa
, fmt
) != 1)
4501 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
4504 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4505 if (opcode
== XTENSA_UNDEFINED
)
4507 insn_len
= xtensa_format_length (isa
, fmt
);
4508 if (insn_len
> content_length
)
4511 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
4514 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
4515 content_length
- offset
);
4523 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
4524 "density" instruction to a standard 3-byte instruction. If it is valid,
4525 return the instruction buffer holding the wide instruction. Otherwise,
4526 return 0. The set of valid widenings are specified by a string table
4527 but require some special case operand checks in some cases. */
4529 static xtensa_insnbuf
4530 can_widen_instruction (xtensa_insnbuf slotbuf
,
4532 xtensa_opcode opcode
)
4534 xtensa_isa isa
= xtensa_default_isa
;
4535 xtensa_format o_fmt
;
4538 static xtensa_insnbuf o_insnbuf
= NULL
;
4539 static xtensa_insnbuf o_slotbuf
= NULL
;
4541 if (o_insnbuf
== NULL
)
4543 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
4544 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
4547 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
4549 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
4550 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
4551 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
4553 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
4555 uint32 value
, newval
;
4556 int i
, operand_count
, o_operand_count
, check_operand_count
;
4557 xtensa_opcode o_opcode
;
4559 /* Address does not matter in this case. We might need to fix it
4560 to handle branches/jumps. */
4561 bfd_vma self_address
= 0;
4563 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
4564 if (o_opcode
== XTENSA_UNDEFINED
)
4566 o_fmt
= get_single_format (o_opcode
);
4567 if (o_fmt
== XTENSA_UNDEFINED
)
4570 if (xtensa_format_length (isa
, fmt
) != 2
4571 || xtensa_format_length (isa
, o_fmt
) != 3)
4574 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
4575 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
4576 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
4577 check_operand_count
= o_operand_count
;
4579 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
4584 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
4589 uint32 rawval0
, rawval1
;
4591 if (o_operand_count
!= operand_count
+ 1
4592 || xtensa_operand_get_field (isa
, opcode
, 0,
4593 fmt
, 0, slotbuf
, &rawval0
) != 0
4594 || xtensa_operand_get_field (isa
, opcode
, 1,
4595 fmt
, 0, slotbuf
, &rawval1
) != 0
4596 || rawval0
== rawval1
/* it is a nop */)
4600 check_operand_count
--;
4602 for (i
= 0; i
< check_operand_count
; i
++)
4605 if (is_or
&& i
== o_operand_count
- 1)
4607 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
4609 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
4612 /* PC-relative branches need adjustment, but
4613 the PC-rel operand will always have a relocation. */
4615 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
4617 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
4618 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
4623 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
4633 /* Attempt to widen an instruction. If the widening is valid, perform
4634 the action in-place directly into the contents and return TRUE. Otherwise,
4635 the return value is FALSE and the contents are not modified. */
4638 widen_instruction (bfd_byte
*contents
,
4639 bfd_size_type content_length
,
4640 bfd_size_type offset
)
4642 xtensa_opcode opcode
;
4643 bfd_size_type insn_len
;
4644 xtensa_isa isa
= xtensa_default_isa
;
4646 xtensa_insnbuf o_insnbuf
;
4648 static xtensa_insnbuf insnbuf
= NULL
;
4649 static xtensa_insnbuf slotbuf
= NULL
;
4651 if (insnbuf
== NULL
)
4653 insnbuf
= xtensa_insnbuf_alloc (isa
);
4654 slotbuf
= xtensa_insnbuf_alloc (isa
);
4657 BFD_ASSERT (offset
< content_length
);
4659 if (content_length
< 2)
4662 /* We will hand-code a few of these for a little while.
4663 These have all been specified in the assembler aleady. */
4664 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4665 content_length
- offset
);
4666 fmt
= xtensa_format_decode (isa
, insnbuf
);
4667 if (xtensa_format_num_slots (isa
, fmt
) != 1)
4670 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
4673 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4674 if (opcode
== XTENSA_UNDEFINED
)
4676 insn_len
= xtensa_format_length (isa
, fmt
);
4677 if (insn_len
> content_length
)
4680 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
4683 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
4684 content_length
- offset
);
4691 /* Code for transforming CALLs at link-time. */
4693 static bfd_reloc_status_type
4694 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
4696 bfd_vma content_length
,
4697 char **error_message
)
4699 static xtensa_insnbuf insnbuf
= NULL
;
4700 static xtensa_insnbuf slotbuf
= NULL
;
4701 xtensa_format core_format
= XTENSA_UNDEFINED
;
4702 xtensa_opcode opcode
;
4703 xtensa_opcode direct_call_opcode
;
4704 xtensa_isa isa
= xtensa_default_isa
;
4705 bfd_byte
*chbuf
= contents
+ address
;
4708 if (insnbuf
== NULL
)
4710 insnbuf
= xtensa_insnbuf_alloc (isa
);
4711 slotbuf
= xtensa_insnbuf_alloc (isa
);
4714 if (content_length
< address
)
4716 *error_message
= _("attempt to convert L32R/CALLX to CALL failed");
4717 return bfd_reloc_other
;
4720 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
4721 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
4722 if (direct_call_opcode
== XTENSA_UNDEFINED
)
4724 *error_message
= _("attempt to convert L32R/CALLX to CALL failed");
4725 return bfd_reloc_other
;
4728 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
4729 core_format
= xtensa_format_lookup (isa
, "x24");
4730 opcode
= xtensa_opcode_lookup (isa
, "or");
4731 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
4732 for (opn
= 0; opn
< 3; opn
++)
4735 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
4736 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
4739 xtensa_format_encode (isa
, core_format
, insnbuf
);
4740 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
4741 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
4743 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
4744 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
4745 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
4747 xtensa_format_encode (isa
, core_format
, insnbuf
);
4748 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
4749 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
4750 content_length
- address
- 3);
4752 return bfd_reloc_ok
;
4756 static bfd_reloc_status_type
4757 contract_asm_expansion (bfd_byte
*contents
,
4758 bfd_vma content_length
,
4759 Elf_Internal_Rela
*irel
,
4760 char **error_message
)
4762 bfd_reloc_status_type retval
=
4763 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
4766 if (retval
!= bfd_reloc_ok
)
4767 return bfd_reloc_dangerous
;
4769 /* Update the irel->r_offset field so that the right immediate and
4770 the right instruction are modified during the relocation. */
4771 irel
->r_offset
+= 3;
4772 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
4773 return bfd_reloc_ok
;
4777 static xtensa_opcode
4778 swap_callx_for_call_opcode (xtensa_opcode opcode
)
4780 init_call_opcodes ();
4782 if (opcode
== callx0_op
) return call0_op
;
4783 if (opcode
== callx4_op
) return call4_op
;
4784 if (opcode
== callx8_op
) return call8_op
;
4785 if (opcode
== callx12_op
) return call12_op
;
4787 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
4788 return XTENSA_UNDEFINED
;
4792 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
4793 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
4794 If not, return XTENSA_UNDEFINED. */
4796 #define L32R_TARGET_REG_OPERAND 0
4797 #define CONST16_TARGET_REG_OPERAND 0
4798 #define CALLN_SOURCE_OPERAND 0
4800 static xtensa_opcode
4801 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
4803 static xtensa_insnbuf insnbuf
= NULL
;
4804 static xtensa_insnbuf slotbuf
= NULL
;
4806 xtensa_opcode opcode
;
4807 xtensa_isa isa
= xtensa_default_isa
;
4808 uint32 regno
, const16_regno
, call_regno
;
4811 if (insnbuf
== NULL
)
4813 insnbuf
= xtensa_insnbuf_alloc (isa
);
4814 slotbuf
= xtensa_insnbuf_alloc (isa
);
4817 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
4818 fmt
= xtensa_format_decode (isa
, insnbuf
);
4819 if (fmt
== XTENSA_UNDEFINED
4820 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4821 return XTENSA_UNDEFINED
;
4823 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4824 if (opcode
== XTENSA_UNDEFINED
)
4825 return XTENSA_UNDEFINED
;
4827 if (opcode
== get_l32r_opcode ())
4830 *p_uses_l32r
= TRUE
;
4831 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4832 fmt
, 0, slotbuf
, ®no
)
4833 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4835 return XTENSA_UNDEFINED
;
4837 else if (opcode
== get_const16_opcode ())
4840 *p_uses_l32r
= FALSE
;
4841 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4842 fmt
, 0, slotbuf
, ®no
)
4843 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4845 return XTENSA_UNDEFINED
;
4847 /* Check that the next instruction is also CONST16. */
4848 offset
+= xtensa_format_length (isa
, fmt
);
4849 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4850 fmt
= xtensa_format_decode (isa
, insnbuf
);
4851 if (fmt
== XTENSA_UNDEFINED
4852 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4853 return XTENSA_UNDEFINED
;
4854 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4855 if (opcode
!= get_const16_opcode ())
4856 return XTENSA_UNDEFINED
;
4858 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4859 fmt
, 0, slotbuf
, &const16_regno
)
4860 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4862 || const16_regno
!= regno
)
4863 return XTENSA_UNDEFINED
;
4866 return XTENSA_UNDEFINED
;
4868 /* Next instruction should be an CALLXn with operand 0 == regno. */
4869 offset
+= xtensa_format_length (isa
, fmt
);
4870 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4871 fmt
= xtensa_format_decode (isa
, insnbuf
);
4872 if (fmt
== XTENSA_UNDEFINED
4873 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4874 return XTENSA_UNDEFINED
;
4875 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4876 if (opcode
== XTENSA_UNDEFINED
4877 || !is_indirect_call_opcode (opcode
))
4878 return XTENSA_UNDEFINED
;
4880 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4881 fmt
, 0, slotbuf
, &call_regno
)
4882 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4884 return XTENSA_UNDEFINED
;
4886 if (call_regno
!= regno
)
4887 return XTENSA_UNDEFINED
;
4893 /* Data structures used during relaxation. */
4895 /* r_reloc: relocation values. */
4897 /* Through the relaxation process, we need to keep track of the values
4898 that will result from evaluating relocations. The standard ELF
4899 relocation structure is not sufficient for this purpose because we're
4900 operating on multiple input files at once, so we need to know which
4901 input file a relocation refers to. The r_reloc structure thus
4902 records both the input file (bfd) and ELF relocation.
4904 For efficiency, an r_reloc also contains a "target_offset" field to
4905 cache the target-section-relative offset value that is represented by
4908 The r_reloc also contains a virtual offset that allows multiple
4909 inserted literals to be placed at the same "address" with
4910 different offsets. */
4912 typedef struct r_reloc_struct r_reloc
;
4914 struct r_reloc_struct
4917 Elf_Internal_Rela rela
;
4918 bfd_vma target_offset
;
4919 bfd_vma virtual_offset
;
4923 /* The r_reloc structure is included by value in literal_value, but not
4924 every literal_value has an associated relocation -- some are simple
4925 constants. In such cases, we set all the fields in the r_reloc
4926 struct to zero. The r_reloc_is_const function should be used to
4927 detect this case. */
4930 r_reloc_is_const (const r_reloc
*r_rel
)
4932 return (r_rel
->abfd
== NULL
);
4937 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4939 bfd_vma target_offset
;
4940 unsigned long r_symndx
;
4942 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4943 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4944 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4945 return (target_offset
+ r_rel
->rela
.r_addend
);
4949 static struct elf_link_hash_entry
*
4950 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4952 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4953 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4958 r_reloc_get_section (const r_reloc
*r_rel
)
4960 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4961 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4966 r_reloc_is_defined (const r_reloc
*r_rel
)
4972 sec
= r_reloc_get_section (r_rel
);
4973 if (sec
== bfd_abs_section_ptr
4974 || sec
== bfd_com_section_ptr
4975 || sec
== bfd_und_section_ptr
)
4982 r_reloc_init (r_reloc
*r_rel
,
4984 Elf_Internal_Rela
*irel
,
4986 bfd_size_type content_length
)
4989 reloc_howto_type
*howto
;
4993 r_rel
->rela
= *irel
;
4995 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4996 r_rel
->virtual_offset
= 0;
4997 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4998 howto
= &elf_howto_table
[r_type
];
4999 if (howto
->partial_inplace
)
5001 bfd_vma inplace_val
;
5002 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
5004 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
5005 r_rel
->target_offset
+= inplace_val
;
5009 memset (r_rel
, 0, sizeof (r_reloc
));
5016 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
5018 if (r_reloc_is_defined (r_rel
))
5020 asection
*sec
= r_reloc_get_section (r_rel
);
5021 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
5023 else if (r_reloc_get_hash_entry (r_rel
))
5024 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
5026 fprintf (fp
, " ?? + ");
5028 fprintf_vma (fp
, r_rel
->target_offset
);
5029 if (r_rel
->virtual_offset
)
5031 fprintf (fp
, " + ");
5032 fprintf_vma (fp
, r_rel
->virtual_offset
);
5041 /* source_reloc: relocations that reference literals. */
5043 /* To determine whether literals can be coalesced, we need to first
5044 record all the relocations that reference the literals. The
5045 source_reloc structure below is used for this purpose. The
5046 source_reloc entries are kept in a per-literal-section array, sorted
5047 by offset within the literal section (i.e., target offset).
5049 The source_sec and r_rel.rela.r_offset fields identify the source of
5050 the relocation. The r_rel field records the relocation value, i.e.,
5051 the offset of the literal being referenced. The opnd field is needed
5052 to determine the range of the immediate field to which the relocation
5053 applies, so we can determine whether another literal with the same
5054 value is within range. The is_null field is true when the relocation
5055 is being removed (e.g., when an L32R is being removed due to a CALLX
5056 that is converted to a direct CALL). */
5058 typedef struct source_reloc_struct source_reloc
;
5060 struct source_reloc_struct
5062 asection
*source_sec
;
5064 xtensa_opcode opcode
;
5066 bfd_boolean is_null
;
5067 bfd_boolean is_abs_literal
;
5072 init_source_reloc (source_reloc
*reloc
,
5073 asection
*source_sec
,
5074 const r_reloc
*r_rel
,
5075 xtensa_opcode opcode
,
5077 bfd_boolean is_abs_literal
)
5079 reloc
->source_sec
= source_sec
;
5080 reloc
->r_rel
= *r_rel
;
5081 reloc
->opcode
= opcode
;
5083 reloc
->is_null
= FALSE
;
5084 reloc
->is_abs_literal
= is_abs_literal
;
5088 /* Find the source_reloc for a particular source offset and relocation
5089 type. Note that the array is sorted by _target_ offset, so this is
5090 just a linear search. */
5092 static source_reloc
*
5093 find_source_reloc (source_reloc
*src_relocs
,
5096 Elf_Internal_Rela
*irel
)
5100 for (i
= 0; i
< src_count
; i
++)
5102 if (src_relocs
[i
].source_sec
== sec
5103 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
5104 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
5105 == ELF32_R_TYPE (irel
->r_info
)))
5106 return &src_relocs
[i
];
5114 source_reloc_compare (const void *ap
, const void *bp
)
5116 const source_reloc
*a
= (const source_reloc
*) ap
;
5117 const source_reloc
*b
= (const source_reloc
*) bp
;
5119 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
5120 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
5122 /* We don't need to sort on these criteria for correctness,
5123 but enforcing a more strict ordering prevents unstable qsort
5124 from behaving differently with different implementations.
5125 Without the code below we get correct but different results
5126 on Solaris 2.7 and 2.8. We would like to always produce the
5127 same results no matter the host. */
5129 if ((!a
->is_null
) - (!b
->is_null
))
5130 return ((!a
->is_null
) - (!b
->is_null
));
5131 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
5135 /* Literal values and value hash tables. */
5137 /* Literals with the same value can be coalesced. The literal_value
5138 structure records the value of a literal: the "r_rel" field holds the
5139 information from the relocation on the literal (if there is one) and
5140 the "value" field holds the contents of the literal word itself.
5142 The value_map structure records a literal value along with the
5143 location of a literal holding that value. The value_map hash table
5144 is indexed by the literal value, so that we can quickly check if a
5145 particular literal value has been seen before and is thus a candidate
5148 typedef struct literal_value_struct literal_value
;
5149 typedef struct value_map_struct value_map
;
5150 typedef struct value_map_hash_table_struct value_map_hash_table
;
5152 struct literal_value_struct
5155 unsigned long value
;
5156 bfd_boolean is_abs_literal
;
5159 struct value_map_struct
5161 literal_value val
; /* The literal value. */
5162 r_reloc loc
; /* Location of the literal. */
5166 struct value_map_hash_table_struct
5168 unsigned bucket_count
;
5169 value_map
**buckets
;
5171 bfd_boolean has_last_loc
;
5177 init_literal_value (literal_value
*lit
,
5178 const r_reloc
*r_rel
,
5179 unsigned long value
,
5180 bfd_boolean is_abs_literal
)
5182 lit
->r_rel
= *r_rel
;
5184 lit
->is_abs_literal
= is_abs_literal
;
5189 literal_value_equal (const literal_value
*src1
,
5190 const literal_value
*src2
,
5191 bfd_boolean final_static_link
)
5193 struct elf_link_hash_entry
*h1
, *h2
;
5195 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
5198 if (r_reloc_is_const (&src1
->r_rel
))
5199 return (src1
->value
== src2
->value
);
5201 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
5202 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
5205 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
5208 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
5211 if (src1
->value
!= src2
->value
)
5214 /* Now check for the same section (if defined) or the same elf_hash
5215 (if undefined or weak). */
5216 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
5217 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
5218 if (r_reloc_is_defined (&src1
->r_rel
)
5219 && (final_static_link
5220 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
5221 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
5223 if (r_reloc_get_section (&src1
->r_rel
)
5224 != r_reloc_get_section (&src2
->r_rel
))
5229 /* Require that the hash entries (i.e., symbols) be identical. */
5230 if (h1
!= h2
|| h1
== 0)
5234 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
5241 /* Must be power of 2. */
5242 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
5244 static value_map_hash_table
*
5245 value_map_hash_table_init (void)
5247 value_map_hash_table
*values
;
5249 values
= (value_map_hash_table
*)
5250 bfd_zmalloc (sizeof (value_map_hash_table
));
5251 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
5253 values
->buckets
= (value_map
**)
5254 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
5255 if (values
->buckets
== NULL
)
5260 values
->has_last_loc
= FALSE
;
5267 value_map_hash_table_delete (value_map_hash_table
*table
)
5269 free (table
->buckets
);
5275 hash_bfd_vma (bfd_vma val
)
5277 return (val
>> 2) + (val
>> 10);
5282 literal_value_hash (const literal_value
*src
)
5286 hash_val
= hash_bfd_vma (src
->value
);
5287 if (!r_reloc_is_const (&src
->r_rel
))
5291 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
5292 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
5293 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
5295 /* Now check for the same section and the same elf_hash. */
5296 if (r_reloc_is_defined (&src
->r_rel
))
5297 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
5299 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
5300 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
5306 /* Check if the specified literal_value has been seen before. */
5309 value_map_get_cached_value (value_map_hash_table
*map
,
5310 const literal_value
*val
,
5311 bfd_boolean final_static_link
)
5317 idx
= literal_value_hash (val
);
5318 idx
= idx
& (map
->bucket_count
- 1);
5319 bucket
= map
->buckets
[idx
];
5320 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
5322 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
5329 /* Record a new literal value. It is illegal to call this if VALUE
5330 already has an entry here. */
5333 add_value_map (value_map_hash_table
*map
,
5334 const literal_value
*val
,
5336 bfd_boolean final_static_link
)
5338 value_map
**bucket_p
;
5341 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
5344 bfd_set_error (bfd_error_no_memory
);
5348 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
5352 idx
= literal_value_hash (val
);
5353 idx
= idx
& (map
->bucket_count
- 1);
5354 bucket_p
= &map
->buckets
[idx
];
5356 val_e
->next
= *bucket_p
;
5359 /* FIXME: Consider resizing the hash table if we get too many entries. */
5365 /* Lists of text actions (ta_) for narrowing, widening, longcall
5366 conversion, space fill, code & literal removal, etc. */
5368 /* The following text actions are generated:
5370 "ta_remove_insn" remove an instruction or instructions
5371 "ta_remove_longcall" convert longcall to call
5372 "ta_convert_longcall" convert longcall to nop/call
5373 "ta_narrow_insn" narrow a wide instruction
5374 "ta_widen" widen a narrow instruction
5375 "ta_fill" add fill or remove fill
5376 removed < 0 is a fill; branches to the fill address will be
5377 changed to address + fill size (e.g., address - removed)
5378 removed >= 0 branches to the fill address will stay unchanged
5379 "ta_remove_literal" remove a literal; this action is
5380 indicated when a literal is removed
5382 "ta_add_literal" insert a new literal; this action is
5383 indicated when a literal has been moved.
5384 It may use a virtual_offset because
5385 multiple literals can be placed at the
5388 For each of these text actions, we also record the number of bytes
5389 removed by performing the text action. In the case of a "ta_widen"
5390 or a "ta_fill" that adds space, the removed_bytes will be negative. */
5392 typedef struct text_action_struct text_action
;
5393 typedef struct text_action_list_struct text_action_list
;
5394 typedef enum text_action_enum_t text_action_t
;
5396 enum text_action_enum_t
5399 ta_remove_insn
, /* removed = -size */
5400 ta_remove_longcall
, /* removed = -size */
5401 ta_convert_longcall
, /* removed = 0 */
5402 ta_narrow_insn
, /* removed = -1 */
5403 ta_widen_insn
, /* removed = +1 */
5404 ta_fill
, /* removed = +size */
5410 /* Structure for a text action record. */
5411 struct text_action_struct
5413 text_action_t action
;
5414 asection
*sec
; /* Optional */
5416 bfd_vma virtual_offset
; /* Zero except for adding literals. */
5418 literal_value value
; /* Only valid when adding literals. */
5421 struct removal_by_action_entry_struct
5426 int eq_removed_before_fill
;
5428 typedef struct removal_by_action_entry_struct removal_by_action_entry
;
5430 struct removal_by_action_map_struct
5433 removal_by_action_entry
*entry
;
5435 typedef struct removal_by_action_map_struct removal_by_action_map
;
5438 /* List of all of the actions taken on a text section. */
5439 struct text_action_list_struct
5443 removal_by_action_map map
;
5447 static text_action
*
5448 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
5452 /* It is not necessary to fill at the end of a section. */
5453 if (sec
->size
== offset
)
5459 splay_tree_node node
= splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
);
5461 return (text_action
*)node
->value
;
5467 compute_removed_action_diff (const text_action
*ta
,
5471 int removable_space
)
5474 int current_removed
= 0;
5477 current_removed
= ta
->removed_bytes
;
5479 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
5480 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
5482 /* It is not necessary to fill at the end of a section. Clean this up. */
5483 if (sec
->size
== offset
)
5484 new_removed
= removable_space
- 0;
5488 int added
= -removed
- current_removed
;
5489 /* Ignore multiples of the section alignment. */
5490 added
= ((1 << sec
->alignment_power
) - 1) & added
;
5491 new_removed
= (-added
);
5493 /* Modify for removable. */
5494 space
= removable_space
- new_removed
;
5495 new_removed
= (removable_space
5496 - (((1 << sec
->alignment_power
) - 1) & space
));
5498 return (new_removed
- current_removed
);
5503 adjust_fill_action (text_action
*ta
, int fill_diff
)
5505 ta
->removed_bytes
+= fill_diff
;
5510 text_action_compare (splay_tree_key a
, splay_tree_key b
)
5512 text_action
*pa
= (text_action
*)a
;
5513 text_action
*pb
= (text_action
*)b
;
5514 static const int action_priority
[] =
5518 [ta_convert_longcall
] = 2,
5519 [ta_narrow_insn
] = 3,
5520 [ta_remove_insn
] = 4,
5521 [ta_remove_longcall
] = 5,
5522 [ta_remove_literal
] = 6,
5523 [ta_widen_insn
] = 7,
5524 [ta_add_literal
] = 8,
5527 if (pa
->offset
== pb
->offset
)
5529 if (pa
->action
== pb
->action
)
5531 return action_priority
[pa
->action
] - action_priority
[pb
->action
];
5534 return pa
->offset
< pb
->offset
? -1 : 1;
5537 static text_action
*
5538 action_first (text_action_list
*action_list
)
5540 splay_tree_node node
= splay_tree_min (action_list
->tree
);
5541 return node
? (text_action
*)node
->value
: NULL
;
5544 static text_action
*
5545 action_next (text_action_list
*action_list
, text_action
*action
)
5547 splay_tree_node node
= splay_tree_successor (action_list
->tree
,
5548 (splay_tree_key
)action
);
5549 return node
? (text_action
*)node
->value
: NULL
;
5552 /* Add a modification action to the text. For the case of adding or
5553 removing space, modify any current fill and assume that
5554 "unreachable_space" bytes can be freely contracted. Note that a
5555 negative removed value is a fill. */
5558 text_action_add (text_action_list
*l
,
5559 text_action_t action
,
5567 /* It is not necessary to fill at the end of a section. */
5568 if (action
== ta_fill
&& sec
->size
== offset
)
5571 /* It is not necessary to fill 0 bytes. */
5572 if (action
== ta_fill
&& removed
== 0)
5578 if (action
== ta_fill
)
5580 splay_tree_node node
= splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
);
5584 ta
= (text_action
*)node
->value
;
5585 ta
->removed_bytes
+= removed
;
5590 BFD_ASSERT (splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
) == NULL
);
5592 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
5593 ta
->action
= action
;
5595 ta
->offset
= offset
;
5596 ta
->removed_bytes
= removed
;
5597 splay_tree_insert (l
->tree
, (splay_tree_key
)ta
, (splay_tree_value
)ta
);
5603 text_action_add_literal (text_action_list
*l
,
5604 text_action_t action
,
5606 const literal_value
*value
,
5610 asection
*sec
= r_reloc_get_section (loc
);
5611 bfd_vma offset
= loc
->target_offset
;
5612 bfd_vma virtual_offset
= loc
->virtual_offset
;
5614 BFD_ASSERT (action
== ta_add_literal
);
5616 /* Create a new record and fill it up. */
5617 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
5618 ta
->action
= action
;
5620 ta
->offset
= offset
;
5621 ta
->virtual_offset
= virtual_offset
;
5623 ta
->removed_bytes
= removed
;
5625 BFD_ASSERT (splay_tree_lookup (l
->tree
, (splay_tree_key
)ta
) == NULL
);
5626 splay_tree_insert (l
->tree
, (splay_tree_key
)ta
, (splay_tree_value
)ta
);
5631 /* Find the total offset adjustment for the relaxations specified by
5632 text_actions, beginning from a particular starting action. This is
5633 typically used from offset_with_removed_text to search an entire list of
5634 actions, but it may also be called directly when adjusting adjacent offsets
5635 so that each search may begin where the previous one left off. */
5638 removed_by_actions (text_action_list
*action_list
,
5639 text_action
**p_start_action
,
5641 bfd_boolean before_fill
)
5646 r
= *p_start_action
;
5649 splay_tree_node node
= splay_tree_lookup (action_list
->tree
,
5651 BFD_ASSERT (node
!= NULL
&& r
== (text_action
*)node
->value
);
5656 if (r
->offset
> offset
)
5659 if (r
->offset
== offset
5660 && (before_fill
|| r
->action
!= ta_fill
|| r
->removed_bytes
>= 0))
5663 removed
+= r
->removed_bytes
;
5665 r
= action_next (action_list
, r
);
5668 *p_start_action
= r
;
5674 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
5676 text_action
*r
= action_first (action_list
);
5678 return offset
- removed_by_actions (action_list
, &r
, offset
, FALSE
);
5683 action_list_count (text_action_list
*action_list
)
5685 return action_list
->count
;
5688 typedef struct map_action_fn_context_struct map_action_fn_context
;
5689 struct map_action_fn_context_struct
5692 removal_by_action_map map
;
5693 bfd_boolean eq_complete
;
5697 map_action_fn (splay_tree_node node
, void *p
)
5699 map_action_fn_context
*ctx
= p
;
5700 text_action
*r
= (text_action
*)node
->value
;
5701 removal_by_action_entry
*ientry
= ctx
->map
.entry
+ ctx
->map
.n_entries
;
5703 if (ctx
->map
.n_entries
&& (ientry
- 1)->offset
== r
->offset
)
5709 ++ctx
->map
.n_entries
;
5710 ctx
->eq_complete
= FALSE
;
5711 ientry
->offset
= r
->offset
;
5712 ientry
->eq_removed_before_fill
= ctx
->removed
;
5715 if (!ctx
->eq_complete
)
5717 if (r
->action
!= ta_fill
|| r
->removed_bytes
>= 0)
5719 ientry
->eq_removed
= ctx
->removed
;
5720 ctx
->eq_complete
= TRUE
;
5723 ientry
->eq_removed
= ctx
->removed
+ r
->removed_bytes
;
5726 ctx
->removed
+= r
->removed_bytes
;
5727 ientry
->removed
= ctx
->removed
;
5732 map_removal_by_action (text_action_list
*action_list
)
5734 map_action_fn_context ctx
;
5737 ctx
.map
.n_entries
= 0;
5738 ctx
.map
.entry
= bfd_malloc (action_list_count (action_list
) *
5739 sizeof (removal_by_action_entry
));
5740 ctx
.eq_complete
= FALSE
;
5742 splay_tree_foreach (action_list
->tree
, map_action_fn
, &ctx
);
5743 action_list
->map
= ctx
.map
;
5747 removed_by_actions_map (text_action_list
*action_list
, bfd_vma offset
,
5748 bfd_boolean before_fill
)
5752 if (!action_list
->map
.entry
)
5753 map_removal_by_action (action_list
);
5755 if (!action_list
->map
.n_entries
)
5759 b
= action_list
->map
.n_entries
;
5763 unsigned c
= (a
+ b
) / 2;
5765 if (action_list
->map
.entry
[c
].offset
<= offset
)
5771 if (action_list
->map
.entry
[a
].offset
< offset
)
5773 return action_list
->map
.entry
[a
].removed
;
5775 else if (action_list
->map
.entry
[a
].offset
== offset
)
5777 return before_fill
?
5778 action_list
->map
.entry
[a
].eq_removed_before_fill
:
5779 action_list
->map
.entry
[a
].eq_removed
;
5788 offset_with_removed_text_map (text_action_list
*action_list
, bfd_vma offset
)
5790 int removed
= removed_by_actions_map (action_list
, offset
, FALSE
);
5791 return offset
- removed
;
5795 /* The find_insn_action routine will only find non-fill actions. */
5797 static text_action
*
5798 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
5800 static const text_action_t action
[] =
5802 ta_convert_longcall
,
5812 for (i
= 0; i
< sizeof (action
) / sizeof (*action
); ++i
)
5814 splay_tree_node node
;
5816 a
.action
= action
[i
];
5817 node
= splay_tree_lookup (action_list
->tree
, (splay_tree_key
)&a
);
5819 return (text_action
*)node
->value
;
5828 print_action (FILE *fp
, text_action
*r
)
5830 const char *t
= "unknown";
5833 case ta_remove_insn
:
5834 t
= "remove_insn"; break;
5835 case ta_remove_longcall
:
5836 t
= "remove_longcall"; break;
5837 case ta_convert_longcall
:
5838 t
= "convert_longcall"; break;
5839 case ta_narrow_insn
:
5840 t
= "narrow_insn"; break;
5842 t
= "widen_insn"; break;
5847 case ta_remove_literal
:
5848 t
= "remove_literal"; break;
5849 case ta_add_literal
:
5850 t
= "add_literal"; break;
5853 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
5854 r
->sec
->owner
->filename
,
5855 r
->sec
->name
, (unsigned long) r
->offset
, t
, r
->removed_bytes
);
5859 print_action_list_fn (splay_tree_node node
, void *p
)
5861 text_action
*r
= (text_action
*)node
->value
;
5863 print_action (p
, r
);
5868 print_action_list (FILE *fp
, text_action_list
*action_list
)
5870 fprintf (fp
, "Text Action\n");
5871 splay_tree_foreach (action_list
->tree
, print_action_list_fn
, fp
);
5877 /* Lists of literals being coalesced or removed. */
5879 /* In the usual case, the literal identified by "from" is being
5880 coalesced with another literal identified by "to". If the literal is
5881 unused and is being removed altogether, "to.abfd" will be NULL.
5882 The removed_literal entries are kept on a per-section list, sorted
5883 by the "from" offset field. */
5885 typedef struct removed_literal_struct removed_literal
;
5886 typedef struct removed_literal_map_entry_struct removed_literal_map_entry
;
5887 typedef struct removed_literal_list_struct removed_literal_list
;
5889 struct removed_literal_struct
5893 removed_literal
*next
;
5896 struct removed_literal_map_entry_struct
5899 removed_literal
*literal
;
5902 struct removed_literal_list_struct
5904 removed_literal
*head
;
5905 removed_literal
*tail
;
5908 removed_literal_map_entry
*map
;
5912 /* Record that the literal at "from" is being removed. If "to" is not
5913 NULL, the "from" literal is being coalesced with the "to" literal. */
5916 add_removed_literal (removed_literal_list
*removed_list
,
5917 const r_reloc
*from
,
5920 removed_literal
*r
, *new_r
, *next_r
;
5922 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
5924 new_r
->from
= *from
;
5928 new_r
->to
.abfd
= NULL
;
5931 r
= removed_list
->head
;
5934 removed_list
->head
= new_r
;
5935 removed_list
->tail
= new_r
;
5937 /* Special check for common case of append. */
5938 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
5940 removed_list
->tail
->next
= new_r
;
5941 removed_list
->tail
= new_r
;
5945 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
5951 new_r
->next
= next_r
;
5953 removed_list
->tail
= new_r
;
5958 map_removed_literal (removed_literal_list
*removed_list
)
5962 removed_literal_map_entry
*map
= NULL
;
5963 removed_literal
*r
= removed_list
->head
;
5965 for (i
= 0; r
; ++i
, r
= r
->next
)
5969 n_map
= (n_map
* 2) + 2;
5970 map
= bfd_realloc (map
, n_map
* sizeof (*map
));
5972 map
[i
].addr
= r
->from
.target_offset
;
5975 removed_list
->map
= map
;
5976 removed_list
->n_map
= i
;
5980 removed_literal_compare (const void *a
, const void *b
)
5982 const removed_literal_map_entry
*pa
= a
;
5983 const removed_literal_map_entry
*pb
= b
;
5985 if (pa
->addr
== pb
->addr
)
5988 return pa
->addr
< pb
->addr
? -1 : 1;
5991 /* Check if the list of removed literals contains an entry for the
5992 given address. Return the entry if found. */
5994 static removed_literal
*
5995 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
5997 removed_literal_map_entry
*p
;
5998 removed_literal
*r
= NULL
;
6000 if (removed_list
->map
== NULL
)
6001 map_removed_literal (removed_list
);
6003 p
= bsearch (&addr
, removed_list
->map
, removed_list
->n_map
,
6004 sizeof (*removed_list
->map
), removed_literal_compare
);
6007 while (p
!= removed_list
->map
&& (p
- 1)->addr
== addr
)
6018 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
6021 r
= removed_list
->head
;
6023 fprintf (fp
, "Removed Literals\n");
6024 for (; r
!= NULL
; r
= r
->next
)
6026 print_r_reloc (fp
, &r
->from
);
6027 fprintf (fp
, " => ");
6028 if (r
->to
.abfd
== NULL
)
6029 fprintf (fp
, "REMOVED");
6031 print_r_reloc (fp
, &r
->to
);
6039 /* Per-section data for relaxation. */
6041 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
6043 struct xtensa_relax_info_struct
6045 bfd_boolean is_relaxable_literal_section
;
6046 bfd_boolean is_relaxable_asm_section
;
6047 int visited
; /* Number of times visited. */
6049 source_reloc
*src_relocs
; /* Array[src_count]. */
6051 int src_next
; /* Next src_relocs entry to assign. */
6053 removed_literal_list removed_list
;
6054 text_action_list action_list
;
6056 reloc_bfd_fix
*fix_list
;
6057 reloc_bfd_fix
*fix_array
;
6058 unsigned fix_array_count
;
6060 /* Support for expanding the reloc array that is stored
6061 in the section structure. If the relocations have been
6062 reallocated, the newly allocated relocations will be referenced
6063 here along with the actual size allocated. The relocation
6064 count will always be found in the section structure. */
6065 Elf_Internal_Rela
*allocated_relocs
;
6066 unsigned relocs_count
;
6067 unsigned allocated_relocs_count
;
6070 struct elf_xtensa_section_data
6072 struct bfd_elf_section_data elf
;
6073 xtensa_relax_info relax_info
;
6078 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
6080 if (!sec
->used_by_bfd
)
6082 struct elf_xtensa_section_data
*sdata
;
6083 size_t amt
= sizeof (*sdata
);
6085 sdata
= bfd_zalloc (abfd
, amt
);
6088 sec
->used_by_bfd
= sdata
;
6091 return _bfd_elf_new_section_hook (abfd
, sec
);
6095 static xtensa_relax_info
*
6096 get_xtensa_relax_info (asection
*sec
)
6098 struct elf_xtensa_section_data
*section_data
;
6100 /* No info available if no section or if it is an output section. */
6101 if (!sec
|| sec
== sec
->output_section
)
6104 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
6105 return §ion_data
->relax_info
;
6110 init_xtensa_relax_info (asection
*sec
)
6112 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6114 relax_info
->is_relaxable_literal_section
= FALSE
;
6115 relax_info
->is_relaxable_asm_section
= FALSE
;
6116 relax_info
->visited
= 0;
6118 relax_info
->src_relocs
= NULL
;
6119 relax_info
->src_count
= 0;
6120 relax_info
->src_next
= 0;
6122 relax_info
->removed_list
.head
= NULL
;
6123 relax_info
->removed_list
.tail
= NULL
;
6125 relax_info
->action_list
.tree
= splay_tree_new (text_action_compare
,
6127 relax_info
->action_list
.map
.n_entries
= 0;
6128 relax_info
->action_list
.map
.entry
= NULL
;
6130 relax_info
->fix_list
= NULL
;
6131 relax_info
->fix_array
= NULL
;
6132 relax_info
->fix_array_count
= 0;
6134 relax_info
->allocated_relocs
= NULL
;
6135 relax_info
->relocs_count
= 0;
6136 relax_info
->allocated_relocs_count
= 0;
6140 /* Coalescing literals may require a relocation to refer to a section in
6141 a different input file, but the standard relocation information
6142 cannot express that. Instead, the reloc_bfd_fix structures are used
6143 to "fix" the relocations that refer to sections in other input files.
6144 These structures are kept on per-section lists. The "src_type" field
6145 records the relocation type in case there are multiple relocations on
6146 the same location. FIXME: This is ugly; an alternative might be to
6147 add new symbols with the "owner" field to some other input file. */
6149 struct reloc_bfd_fix_struct
6153 unsigned src_type
; /* Relocation type. */
6155 asection
*target_sec
;
6156 bfd_vma target_offset
;
6157 bfd_boolean translated
;
6159 reloc_bfd_fix
*next
;
6163 static reloc_bfd_fix
*
6164 reloc_bfd_fix_init (asection
*src_sec
,
6167 asection
*target_sec
,
6168 bfd_vma target_offset
,
6169 bfd_boolean translated
)
6173 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
6174 fix
->src_sec
= src_sec
;
6175 fix
->src_offset
= src_offset
;
6176 fix
->src_type
= src_type
;
6177 fix
->target_sec
= target_sec
;
6178 fix
->target_offset
= target_offset
;
6179 fix
->translated
= translated
;
6186 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
6188 xtensa_relax_info
*relax_info
;
6190 relax_info
= get_xtensa_relax_info (src_sec
);
6191 fix
->next
= relax_info
->fix_list
;
6192 relax_info
->fix_list
= fix
;
6197 fix_compare (const void *ap
, const void *bp
)
6199 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
6200 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
6202 if (a
->src_offset
!= b
->src_offset
)
6203 return (a
->src_offset
- b
->src_offset
);
6204 return (a
->src_type
- b
->src_type
);
6209 cache_fix_array (asection
*sec
)
6211 unsigned i
, count
= 0;
6213 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6215 if (relax_info
== NULL
)
6217 if (relax_info
->fix_list
== NULL
)
6220 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
6223 relax_info
->fix_array
=
6224 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
6225 relax_info
->fix_array_count
= count
;
6227 r
= relax_info
->fix_list
;
6228 for (i
= 0; i
< count
; i
++, r
= r
->next
)
6230 relax_info
->fix_array
[count
- 1 - i
] = *r
;
6231 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
6234 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
6235 sizeof (reloc_bfd_fix
), fix_compare
);
6239 static reloc_bfd_fix
*
6240 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
6242 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6246 if (relax_info
== NULL
)
6248 if (relax_info
->fix_list
== NULL
)
6251 if (relax_info
->fix_array
== NULL
)
6252 cache_fix_array (sec
);
6254 key
.src_offset
= offset
;
6255 key
.src_type
= type
;
6256 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
6257 sizeof (reloc_bfd_fix
), fix_compare
);
6262 /* Section caching. */
6264 typedef struct section_cache_struct section_cache_t
;
6266 struct section_cache_struct
6270 bfd_byte
*contents
; /* Cache of the section contents. */
6271 bfd_size_type content_length
;
6273 property_table_entry
*ptbl
; /* Cache of the section property table. */
6276 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
6277 unsigned reloc_count
;
6282 init_section_cache (section_cache_t
*sec_cache
)
6284 memset (sec_cache
, 0, sizeof (*sec_cache
));
6289 free_section_cache (section_cache_t
*sec_cache
)
6293 release_contents (sec_cache
->sec
, sec_cache
->contents
);
6294 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
6295 free (sec_cache
->ptbl
);
6301 section_cache_section (section_cache_t
*sec_cache
,
6303 struct bfd_link_info
*link_info
)
6306 property_table_entry
*prop_table
= NULL
;
6308 bfd_byte
*contents
= NULL
;
6309 Elf_Internal_Rela
*internal_relocs
= NULL
;
6310 bfd_size_type sec_size
;
6314 if (sec
== sec_cache
->sec
)
6318 sec_size
= bfd_get_section_limit (abfd
, sec
);
6320 /* Get the contents. */
6321 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6322 if (contents
== NULL
&& sec_size
!= 0)
6325 /* Get the relocations. */
6326 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6327 link_info
->keep_memory
);
6329 /* Get the entry table. */
6330 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6331 XTENSA_PROP_SEC_NAME
, FALSE
);
6335 /* Fill in the new section cache. */
6336 free_section_cache (sec_cache
);
6337 init_section_cache (sec_cache
);
6339 sec_cache
->sec
= sec
;
6340 sec_cache
->contents
= contents
;
6341 sec_cache
->content_length
= sec_size
;
6342 sec_cache
->relocs
= internal_relocs
;
6343 sec_cache
->reloc_count
= sec
->reloc_count
;
6344 sec_cache
->pte_count
= ptblsize
;
6345 sec_cache
->ptbl
= prop_table
;
6350 release_contents (sec
, contents
);
6351 release_internal_relocs (sec
, internal_relocs
);
6357 /* Extended basic blocks. */
6359 /* An ebb_struct represents an Extended Basic Block. Within this
6360 range, we guarantee that all instructions are decodable, the
6361 property table entries are contiguous, and no property table
6362 specifies a segment that cannot have instructions moved. This
6363 structure contains caches of the contents, property table and
6364 relocations for the specified section for easy use. The range is
6365 specified by ranges of indices for the byte offset, property table
6366 offsets and relocation offsets. These must be consistent. */
6368 typedef struct ebb_struct ebb_t
;
6374 bfd_byte
*contents
; /* Cache of the section contents. */
6375 bfd_size_type content_length
;
6377 property_table_entry
*ptbl
; /* Cache of the section property table. */
6380 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
6381 unsigned reloc_count
;
6383 bfd_vma start_offset
; /* Offset in section. */
6384 unsigned start_ptbl_idx
; /* Offset in the property table. */
6385 unsigned start_reloc_idx
; /* Offset in the relocations. */
6388 unsigned end_ptbl_idx
;
6389 unsigned end_reloc_idx
;
6391 bfd_boolean ends_section
; /* Is this the last ebb in a section? */
6393 /* The unreachable property table at the end of this set of blocks;
6394 NULL if the end is not an unreachable block. */
6395 property_table_entry
*ends_unreachable
;
6399 enum ebb_target_enum
6402 EBB_DESIRE_TGT_ALIGN
,
6403 EBB_REQUIRE_TGT_ALIGN
,
6404 EBB_REQUIRE_LOOP_ALIGN
,
6409 /* proposed_action_struct is similar to the text_action_struct except
6410 that is represents a potential transformation, not one that will
6411 occur. We build a list of these for an extended basic block
6412 and use them to compute the actual actions desired. We must be
6413 careful that the entire set of actual actions we perform do not
6414 break any relocations that would fit if the actions were not
6417 typedef struct proposed_action_struct proposed_action
;
6419 struct proposed_action_struct
6421 enum ebb_target_enum align_type
; /* for the target alignment */
6422 bfd_vma alignment_pow
;
6423 text_action_t action
;
6426 bfd_boolean do_action
; /* If false, then we will not perform the action. */
6430 /* The ebb_constraint_struct keeps a set of proposed actions for an
6431 extended basic block. */
6433 typedef struct ebb_constraint_struct ebb_constraint
;
6435 struct ebb_constraint_struct
6438 bfd_boolean start_movable
;
6440 /* Bytes of extra space at the beginning if movable. */
6441 int start_extra_space
;
6443 enum ebb_target_enum start_align
;
6445 bfd_boolean end_movable
;
6447 /* Bytes of extra space at the end if movable. */
6448 int end_extra_space
;
6450 unsigned action_count
;
6451 unsigned action_allocated
;
6453 /* Array of proposed actions. */
6454 proposed_action
*actions
;
6456 /* Action alignments -- one for each proposed action. */
6457 enum ebb_target_enum
*action_aligns
;
6462 init_ebb_constraint (ebb_constraint
*c
)
6464 memset (c
, 0, sizeof (ebb_constraint
));
6469 free_ebb_constraint (ebb_constraint
*c
)
6476 init_ebb (ebb_t
*ebb
,
6479 bfd_size_type content_length
,
6480 property_table_entry
*prop_table
,
6482 Elf_Internal_Rela
*internal_relocs
,
6483 unsigned reloc_count
)
6485 memset (ebb
, 0, sizeof (ebb_t
));
6487 ebb
->contents
= contents
;
6488 ebb
->content_length
= content_length
;
6489 ebb
->ptbl
= prop_table
;
6490 ebb
->pte_count
= ptblsize
;
6491 ebb
->relocs
= internal_relocs
;
6492 ebb
->reloc_count
= reloc_count
;
6493 ebb
->start_offset
= 0;
6494 ebb
->end_offset
= ebb
->content_length
- 1;
6495 ebb
->start_ptbl_idx
= 0;
6496 ebb
->end_ptbl_idx
= ptblsize
;
6497 ebb
->start_reloc_idx
= 0;
6498 ebb
->end_reloc_idx
= reloc_count
;
6502 /* Extend the ebb to all decodable contiguous sections. The algorithm
6503 for building a basic block around an instruction is to push it
6504 forward until we hit the end of a section, an unreachable block or
6505 a block that cannot be transformed. Then we push it backwards
6506 searching for similar conditions. */
6508 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
6509 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
6510 static bfd_size_type insn_block_decodable_len
6511 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
6514 extend_ebb_bounds (ebb_t
*ebb
)
6516 if (!extend_ebb_bounds_forward (ebb
))
6518 if (!extend_ebb_bounds_backward (ebb
))
6525 extend_ebb_bounds_forward (ebb_t
*ebb
)
6527 property_table_entry
*the_entry
, *new_entry
;
6529 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6531 /* Stop when (1) we cannot decode an instruction, (2) we are at
6532 the end of the property tables, (3) we hit a non-contiguous property
6533 table entry, (4) we hit a NO_TRANSFORM region. */
6538 bfd_size_type insn_block_len
;
6540 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
6542 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
6544 entry_end
- ebb
->end_offset
);
6545 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
6548 /* xgettext:c-format */
6549 (_("%pB(%pA+%#" PRIx64
"): could not decode instruction; "
6550 "possible configuration mismatch"),
6551 ebb
->sec
->owner
, ebb
->sec
,
6552 (uint64_t) (ebb
->end_offset
+ insn_block_len
));
6555 ebb
->end_offset
+= insn_block_len
;
6557 if (ebb
->end_offset
== ebb
->sec
->size
)
6558 ebb
->ends_section
= TRUE
;
6560 /* Update the reloc counter. */
6561 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
6562 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
6565 ebb
->end_reloc_idx
++;
6568 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
6571 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
6572 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
6573 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
6574 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
6577 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
6580 the_entry
= new_entry
;
6581 ebb
->end_ptbl_idx
++;
6584 /* Quick check for an unreachable or end of file just at the end. */
6585 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
6587 if (ebb
->end_offset
== ebb
->content_length
)
6588 ebb
->ends_section
= TRUE
;
6592 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
6593 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
6594 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
6595 ebb
->ends_unreachable
= new_entry
;
6598 /* Any other ending requires exact alignment. */
6604 extend_ebb_bounds_backward (ebb_t
*ebb
)
6606 property_table_entry
*the_entry
, *new_entry
;
6608 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6610 /* Stop when (1) we cannot decode the instructions in the current entry.
6611 (2) we are at the beginning of the property tables, (3) we hit a
6612 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
6616 bfd_vma block_begin
;
6617 bfd_size_type insn_block_len
;
6619 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
6621 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
6623 ebb
->start_offset
- block_begin
);
6624 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
6627 /* xgettext:c-format */
6628 (_("%pB(%pA+%#" PRIx64
"): could not decode instruction; "
6629 "possible configuration mismatch"),
6630 ebb
->sec
->owner
, ebb
->sec
,
6631 (uint64_t) (ebb
->end_offset
+ insn_block_len
));
6634 ebb
->start_offset
-= insn_block_len
;
6636 /* Update the reloc counter. */
6637 while (ebb
->start_reloc_idx
> 0
6638 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
6639 >= ebb
->start_offset
))
6641 ebb
->start_reloc_idx
--;
6644 if (ebb
->start_ptbl_idx
== 0)
6647 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
6648 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
6649 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
6650 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
6652 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
6655 the_entry
= new_entry
;
6656 ebb
->start_ptbl_idx
--;
6662 static bfd_size_type
6663 insn_block_decodable_len (bfd_byte
*contents
,
6664 bfd_size_type content_len
,
6665 bfd_vma block_offset
,
6666 bfd_size_type block_len
)
6668 bfd_vma offset
= block_offset
;
6670 while (offset
< block_offset
+ block_len
)
6672 bfd_size_type insn_len
= 0;
6674 insn_len
= insn_decode_len (contents
, content_len
, offset
);
6676 return (offset
- block_offset
);
6679 return (offset
- block_offset
);
6684 ebb_propose_action (ebb_constraint
*c
,
6685 enum ebb_target_enum align_type
,
6686 bfd_vma alignment_pow
,
6687 text_action_t action
,
6690 bfd_boolean do_action
)
6692 proposed_action
*act
;
6694 if (c
->action_allocated
<= c
->action_count
)
6696 unsigned new_allocated
, i
;
6697 proposed_action
*new_actions
;
6699 new_allocated
= (c
->action_count
+ 2) * 2;
6700 new_actions
= (proposed_action
*)
6701 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
6703 for (i
= 0; i
< c
->action_count
; i
++)
6704 new_actions
[i
] = c
->actions
[i
];
6706 c
->actions
= new_actions
;
6707 c
->action_allocated
= new_allocated
;
6710 act
= &c
->actions
[c
->action_count
];
6711 act
->align_type
= align_type
;
6712 act
->alignment_pow
= alignment_pow
;
6713 act
->action
= action
;
6714 act
->offset
= offset
;
6715 act
->removed_bytes
= removed_bytes
;
6716 act
->do_action
= do_action
;
6722 /* Access to internal relocations, section contents and symbols. */
6724 /* During relaxation, we need to modify relocations, section contents,
6725 and symbol definitions, and we need to keep the original values from
6726 being reloaded from the input files, i.e., we need to "pin" the
6727 modified values in memory. We also want to continue to observe the
6728 setting of the "keep-memory" flag. The following functions wrap the
6729 standard BFD functions to take care of this for us. */
6731 static Elf_Internal_Rela
*
6732 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
6734 Elf_Internal_Rela
*internal_relocs
;
6736 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
6739 internal_relocs
= elf_section_data (sec
)->relocs
;
6740 if (internal_relocs
== NULL
)
6741 internal_relocs
= (_bfd_elf_link_read_relocs
6742 (abfd
, sec
, NULL
, NULL
, keep_memory
));
6743 return internal_relocs
;
6748 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
6750 elf_section_data (sec
)->relocs
= internal_relocs
;
6755 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
6757 if (elf_section_data (sec
)->relocs
!= internal_relocs
)
6758 free (internal_relocs
);
6763 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
6766 bfd_size_type sec_size
;
6768 sec_size
= bfd_get_section_limit (abfd
, sec
);
6769 contents
= elf_section_data (sec
)->this_hdr
.contents
;
6771 if (contents
== NULL
&& sec_size
!= 0)
6773 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
6779 elf_section_data (sec
)->this_hdr
.contents
= contents
;
6786 pin_contents (asection
*sec
, bfd_byte
*contents
)
6788 elf_section_data (sec
)->this_hdr
.contents
= contents
;
6793 release_contents (asection
*sec
, bfd_byte
*contents
)
6795 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
6800 static Elf_Internal_Sym
*
6801 retrieve_local_syms (bfd
*input_bfd
)
6803 Elf_Internal_Shdr
*symtab_hdr
;
6804 Elf_Internal_Sym
*isymbuf
;
6807 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6808 locsymcount
= symtab_hdr
->sh_info
;
6810 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6811 if (isymbuf
== NULL
&& locsymcount
!= 0)
6812 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6815 /* Save the symbols for this input file so they won't be read again. */
6816 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
6817 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
6823 /* Code for link-time relaxation. */
6825 /* Initialization for relaxation: */
6826 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
6827 static bfd_boolean find_relaxable_sections
6828 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
6829 static bfd_boolean collect_source_relocs
6830 (bfd
*, asection
*, struct bfd_link_info
*);
6831 static bfd_boolean is_resolvable_asm_expansion
6832 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
6834 static Elf_Internal_Rela
*find_associated_l32r_irel
6835 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
6836 static bfd_boolean compute_text_actions
6837 (bfd
*, asection
*, struct bfd_link_info
*);
6838 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
6839 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
6840 typedef struct reloc_range_list_struct reloc_range_list
;
6841 static bfd_boolean check_section_ebb_pcrels_fit
6842 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*,
6843 reloc_range_list
*, const ebb_constraint
*,
6844 const xtensa_opcode
*);
6845 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
6846 static void text_action_add_proposed
6847 (text_action_list
*, const ebb_constraint
*, asection
*);
6850 static bfd_boolean compute_removed_literals
6851 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
6852 static Elf_Internal_Rela
*get_irel_at_offset
6853 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
6854 static bfd_boolean is_removable_literal
6855 (const source_reloc
*, int, const source_reloc
*, int, asection
*,
6856 property_table_entry
*, int);
6857 static bfd_boolean remove_dead_literal
6858 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6859 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
6860 static bfd_boolean identify_literal_placement
6861 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
6862 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
6863 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
6865 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
6866 static bfd_boolean coalesce_shared_literal
6867 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
6868 static bfd_boolean move_shared_literal
6869 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
6870 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
6873 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
6874 static bfd_boolean
translate_section_fixes (asection
*);
6875 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
6876 static asection
*translate_reloc (const r_reloc
*, r_reloc
*, asection
*);
6877 static void shrink_dynamic_reloc_sections
6878 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
6879 static bfd_boolean move_literal
6880 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
6881 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
6882 static bfd_boolean relax_property_section
6883 (bfd
*, asection
*, struct bfd_link_info
*);
6886 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
6890 elf_xtensa_relax_section (bfd
*abfd
,
6892 struct bfd_link_info
*link_info
,
6895 static value_map_hash_table
*values
= NULL
;
6896 static bfd_boolean relocations_analyzed
= FALSE
;
6897 xtensa_relax_info
*relax_info
;
6899 if (!relocations_analyzed
)
6901 /* Do some overall initialization for relaxation. */
6902 values
= value_map_hash_table_init ();
6905 relaxing_section
= TRUE
;
6906 if (!analyze_relocations (link_info
))
6908 relocations_analyzed
= TRUE
;
6912 /* Don't mess with linker-created sections. */
6913 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
6916 relax_info
= get_xtensa_relax_info (sec
);
6917 BFD_ASSERT (relax_info
!= NULL
);
6919 switch (relax_info
->visited
)
6922 /* Note: It would be nice to fold this pass into
6923 analyze_relocations, but it is important for this step that the
6924 sections be examined in link order. */
6925 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
6932 value_map_hash_table_delete (values
);
6934 if (!relax_section (abfd
, sec
, link_info
))
6940 if (!relax_section_symbols (abfd
, sec
))
6945 relax_info
->visited
++;
6950 /* Initialization for relaxation. */
6952 /* This function is called once at the start of relaxation. It scans
6953 all the input sections and marks the ones that are relaxable (i.e.,
6954 literal sections with L32R relocations against them), and then
6955 collects source_reloc information for all the relocations against
6956 those relaxable sections. During this process, it also detects
6957 longcalls, i.e., calls relaxed by the assembler into indirect
6958 calls, that can be optimized back into direct calls. Within each
6959 extended basic block (ebb) containing an optimized longcall, it
6960 computes a set of "text actions" that can be performed to remove
6961 the L32R associated with the longcall while optionally preserving
6962 branch target alignments. */
6965 analyze_relocations (struct bfd_link_info
*link_info
)
6969 bfd_boolean is_relaxable
= FALSE
;
6971 /* Initialize the per-section relaxation info. */
6972 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6973 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6975 init_xtensa_relax_info (sec
);
6978 /* Mark relaxable sections (and count relocations against each one). */
6979 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6980 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6982 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
6986 /* Bail out if there are no relaxable sections. */
6990 /* Allocate space for source_relocs. */
6991 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6992 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6994 xtensa_relax_info
*relax_info
;
6996 relax_info
= get_xtensa_relax_info (sec
);
6997 if (relax_info
->is_relaxable_literal_section
6998 || relax_info
->is_relaxable_asm_section
)
7000 relax_info
->src_relocs
= (source_reloc
*)
7001 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
7004 relax_info
->src_count
= 0;
7007 /* Collect info on relocations against each relaxable section. */
7008 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
7009 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7011 if (!collect_source_relocs (abfd
, sec
, link_info
))
7015 /* Compute the text actions. */
7016 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
7017 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7019 if (!compute_text_actions (abfd
, sec
, link_info
))
7027 /* Find all the sections that might be relaxed. The motivation for
7028 this pass is that collect_source_relocs() needs to record _all_ the
7029 relocations that target each relaxable section. That is expensive
7030 and unnecessary unless the target section is actually going to be
7031 relaxed. This pass identifies all such sections by checking if
7032 they have L32Rs pointing to them. In the process, the total number
7033 of relocations targeting each section is also counted so that we
7034 know how much space to allocate for source_relocs against each
7035 relaxable literal section. */
7038 find_relaxable_sections (bfd
*abfd
,
7040 struct bfd_link_info
*link_info
,
7041 bfd_boolean
*is_relaxable_p
)
7043 Elf_Internal_Rela
*internal_relocs
;
7045 bfd_boolean ok
= TRUE
;
7047 xtensa_relax_info
*source_relax_info
;
7048 bfd_boolean is_l32r_reloc
;
7050 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7051 link_info
->keep_memory
);
7052 if (internal_relocs
== NULL
)
7055 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7056 if (contents
== NULL
&& sec
->size
!= 0)
7062 source_relax_info
= get_xtensa_relax_info (sec
);
7063 for (i
= 0; i
< sec
->reloc_count
; i
++)
7065 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7067 asection
*target_sec
;
7068 xtensa_relax_info
*target_relax_info
;
7070 /* If this section has not already been marked as "relaxable", and
7071 if it contains any ASM_EXPAND relocations (marking expanded
7072 longcalls) that can be optimized into direct calls, then mark
7073 the section as "relaxable". */
7074 if (source_relax_info
7075 && !source_relax_info
->is_relaxable_asm_section
7076 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
7078 bfd_boolean is_reachable
= FALSE
;
7079 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
7080 link_info
, &is_reachable
)
7083 source_relax_info
->is_relaxable_asm_section
= TRUE
;
7084 *is_relaxable_p
= TRUE
;
7088 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7089 bfd_get_section_limit (abfd
, sec
));
7091 target_sec
= r_reloc_get_section (&r_rel
);
7092 target_relax_info
= get_xtensa_relax_info (target_sec
);
7093 if (!target_relax_info
)
7096 /* Count PC-relative operand relocations against the target section.
7097 Note: The conditions tested here must match the conditions under
7098 which init_source_reloc is called in collect_source_relocs(). */
7099 is_l32r_reloc
= FALSE
;
7100 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
7102 xtensa_opcode opcode
=
7103 get_relocation_opcode (abfd
, sec
, contents
, irel
);
7104 if (opcode
!= XTENSA_UNDEFINED
)
7106 is_l32r_reloc
= (opcode
== get_l32r_opcode ());
7107 if (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
7109 target_relax_info
->src_count
++;
7113 if (is_l32r_reloc
&& r_reloc_is_defined (&r_rel
))
7115 /* Mark the target section as relaxable. */
7116 target_relax_info
->is_relaxable_literal_section
= TRUE
;
7117 *is_relaxable_p
= TRUE
;
7122 release_contents (sec
, contents
);
7123 release_internal_relocs (sec
, internal_relocs
);
7128 /* Record _all_ the relocations that point to relaxable sections, and
7129 get rid of ASM_EXPAND relocs by either converting them to
7130 ASM_SIMPLIFY or by removing them. */
7133 collect_source_relocs (bfd
*abfd
,
7135 struct bfd_link_info
*link_info
)
7137 Elf_Internal_Rela
*internal_relocs
;
7139 bfd_boolean ok
= TRUE
;
7141 bfd_size_type sec_size
;
7143 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7144 link_info
->keep_memory
);
7145 if (internal_relocs
== NULL
)
7148 sec_size
= bfd_get_section_limit (abfd
, sec
);
7149 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7150 if (contents
== NULL
&& sec_size
!= 0)
7156 /* Record relocations against relaxable literal sections. */
7157 for (i
= 0; i
< sec
->reloc_count
; i
++)
7159 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7161 asection
*target_sec
;
7162 xtensa_relax_info
*target_relax_info
;
7164 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7166 target_sec
= r_reloc_get_section (&r_rel
);
7167 target_relax_info
= get_xtensa_relax_info (target_sec
);
7169 if (target_relax_info
7170 && (target_relax_info
->is_relaxable_literal_section
7171 || target_relax_info
->is_relaxable_asm_section
))
7173 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
7175 bfd_boolean is_abs_literal
= FALSE
;
7177 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7179 /* None of the current alternate relocs are PC-relative,
7180 and only PC-relative relocs matter here. However, we
7181 still need to record the opcode for literal
7183 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7184 if (opcode
== get_l32r_opcode ())
7186 is_abs_literal
= TRUE
;
7190 opcode
= XTENSA_UNDEFINED
;
7192 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
7194 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7195 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7198 if (opcode
!= XTENSA_UNDEFINED
)
7200 int src_next
= target_relax_info
->src_next
++;
7201 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
7203 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
7209 /* Now get rid of ASM_EXPAND relocations. At this point, the
7210 src_relocs array for the target literal section may still be
7211 incomplete, but it must at least contain the entries for the L32R
7212 relocations associated with ASM_EXPANDs because they were just
7213 added in the preceding loop over the relocations. */
7215 for (i
= 0; i
< sec
->reloc_count
; i
++)
7217 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7218 bfd_boolean is_reachable
;
7220 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
7226 Elf_Internal_Rela
*l32r_irel
;
7228 asection
*target_sec
;
7229 xtensa_relax_info
*target_relax_info
;
7231 /* Mark the source_reloc for the L32R so that it will be
7232 removed in compute_removed_literals(), along with the
7233 associated literal. */
7234 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
7235 irel
, internal_relocs
);
7236 if (l32r_irel
== NULL
)
7239 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
7241 target_sec
= r_reloc_get_section (&r_rel
);
7242 target_relax_info
= get_xtensa_relax_info (target_sec
);
7244 if (target_relax_info
7245 && (target_relax_info
->is_relaxable_literal_section
7246 || target_relax_info
->is_relaxable_asm_section
))
7248 source_reloc
*s_reloc
;
7250 /* Search the source_relocs for the entry corresponding to
7251 the l32r_irel. Note: The src_relocs array is not yet
7252 sorted, but it wouldn't matter anyway because we're
7253 searching by source offset instead of target offset. */
7254 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
7255 target_relax_info
->src_next
,
7257 BFD_ASSERT (s_reloc
);
7258 s_reloc
->is_null
= TRUE
;
7261 /* Convert this reloc to ASM_SIMPLIFY. */
7262 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
7263 R_XTENSA_ASM_SIMPLIFY
);
7264 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7266 pin_internal_relocs (sec
, internal_relocs
);
7270 /* It is resolvable but doesn't reach. We resolve now
7271 by eliminating the relocation -- the call will remain
7272 expanded into L32R/CALLX. */
7273 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7274 pin_internal_relocs (sec
, internal_relocs
);
7279 release_contents (sec
, contents
);
7280 release_internal_relocs (sec
, internal_relocs
);
7285 /* Return TRUE if the asm expansion can be resolved. Generally it can
7286 be resolved on a final link or when a partial link locates it in the
7287 same section as the target. Set "is_reachable" flag if the target of
7288 the call is within the range of a direct call, given the current VMA
7289 for this section and the target section. */
7292 is_resolvable_asm_expansion (bfd
*abfd
,
7295 Elf_Internal_Rela
*irel
,
7296 struct bfd_link_info
*link_info
,
7297 bfd_boolean
*is_reachable_p
)
7299 asection
*target_sec
;
7303 unsigned int first_align
;
7304 unsigned int adjust
;
7305 bfd_vma target_offset
;
7307 xtensa_opcode opcode
, direct_call_opcode
;
7308 bfd_vma self_address
;
7309 bfd_vma dest_address
;
7310 bfd_boolean uses_l32r
;
7311 bfd_size_type sec_size
;
7313 *is_reachable_p
= FALSE
;
7315 if (contents
== NULL
)
7318 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
7321 sec_size
= bfd_get_section_limit (abfd
, sec
);
7322 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
7323 sec_size
- irel
->r_offset
, &uses_l32r
);
7324 /* Optimization of longcalls that use CONST16 is not yet implemented. */
7328 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
7329 if (direct_call_opcode
== XTENSA_UNDEFINED
)
7332 /* Check and see that the target resolves. */
7333 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7334 if (!r_reloc_is_defined (&r_rel
))
7337 target_sec
= r_reloc_get_section (&r_rel
);
7338 target_offset
= r_rel
.target_offset
;
7340 /* If the target is in a shared library, then it doesn't reach. This
7341 isn't supposed to come up because the compiler should never generate
7342 non-PIC calls on systems that use shared libraries, but the linker
7343 shouldn't crash regardless. */
7344 if (!target_sec
->output_section
)
7347 /* For relocatable sections, we can only simplify when the output
7348 section of the target is the same as the output section of the
7350 if (bfd_link_relocatable (link_info
)
7351 && (target_sec
->output_section
!= sec
->output_section
7352 || is_reloc_sym_weak (abfd
, irel
)))
7355 if (target_sec
->output_section
!= sec
->output_section
)
7357 /* If the two sections are sufficiently far away that relaxation
7358 might take the call out of range, we can't simplify. For
7359 example, a positive displacement call into another memory
7360 could get moved to a lower address due to literal removal,
7361 but the destination won't move, and so the displacment might
7364 If the displacement is negative, assume the destination could
7365 move as far back as the start of the output section. The
7366 self_address will be at least as far into the output section
7367 as it is prior to relaxation.
7369 If the displacement is postive, assume the destination will be in
7370 it's pre-relaxed location (because relaxation only makes sections
7371 smaller). The self_address could go all the way to the beginning
7372 of the output section. */
7374 dest_address
= target_sec
->output_section
->vma
;
7375 self_address
= sec
->output_section
->vma
;
7377 if (sec
->output_section
->vma
> target_sec
->output_section
->vma
)
7378 self_address
+= sec
->output_offset
+ irel
->r_offset
+ 3;
7380 dest_address
+= bfd_get_section_limit (abfd
, target_sec
->output_section
);
7381 /* Call targets should be four-byte aligned. */
7382 dest_address
= (dest_address
+ 3) & ~3;
7387 self_address
= (sec
->output_section
->vma
7388 + sec
->output_offset
+ irel
->r_offset
+ 3);
7389 dest_address
= (target_sec
->output_section
->vma
7390 + target_sec
->output_offset
+ target_offset
);
7393 /* Adjust addresses with alignments for the worst case to see if call insn
7394 can fit. Don't relax l32r + callx to call if the target can be out of
7395 range due to alignment.
7396 Caller and target addresses are highest and lowest address.
7397 Search all sections between caller and target, looking for max alignment.
7398 The adjustment is max alignment bytes. If the alignment at the lowest
7399 address is less than the adjustment, apply the adjustment to highest
7402 /* Start from lowest address.
7403 Lowest address aligmnet is from input section.
7404 Initial alignment (adjust) is from input section. */
7405 if (dest_address
> self_address
)
7407 s
= sec
->output_section
;
7408 last_vma
= dest_address
;
7409 first_align
= sec
->alignment_power
;
7410 adjust
= target_sec
->alignment_power
;
7414 s
= target_sec
->output_section
;
7415 last_vma
= self_address
;
7416 first_align
= target_sec
->alignment_power
;
7417 adjust
= sec
->alignment_power
;
7422 /* Find the largest alignment in output section list. */
7423 for (; s
&& s
->vma
>= first_vma
&& s
->vma
<= last_vma
; s
= s
->next
)
7425 if (s
->alignment_power
> adjust
)
7426 adjust
= s
->alignment_power
;
7429 if (adjust
> first_align
)
7431 /* Alignment may enlarge the range, adjust highest address. */
7432 adjust
= 1 << adjust
;
7433 if (dest_address
> self_address
)
7435 dest_address
+= adjust
;
7439 self_address
+= adjust
;
7443 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
7444 self_address
, dest_address
);
7446 if ((self_address
>> CALL_SEGMENT_BITS
) !=
7447 (dest_address
>> CALL_SEGMENT_BITS
))
7454 static Elf_Internal_Rela
*
7455 find_associated_l32r_irel (bfd
*abfd
,
7458 Elf_Internal_Rela
*other_irel
,
7459 Elf_Internal_Rela
*internal_relocs
)
7463 for (i
= 0; i
< sec
->reloc_count
; i
++)
7465 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7467 if (irel
== other_irel
)
7469 if (irel
->r_offset
!= other_irel
->r_offset
)
7471 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
7479 static xtensa_opcode
*
7480 build_reloc_opcodes (bfd
*abfd
,
7483 Elf_Internal_Rela
*internal_relocs
)
7486 xtensa_opcode
*reloc_opcodes
=
7487 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
7488 for (i
= 0; i
< sec
->reloc_count
; i
++)
7490 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7491 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
7493 return reloc_opcodes
;
7496 struct reloc_range_struct
7499 bfd_boolean add
; /* TRUE if start of a range, FALSE otherwise. */
7500 /* Original irel index in the array of relocations for a section. */
7501 unsigned irel_index
;
7503 typedef struct reloc_range_struct reloc_range
;
7505 typedef struct reloc_range_list_entry_struct reloc_range_list_entry
;
7506 struct reloc_range_list_entry_struct
7508 reloc_range_list_entry
*next
;
7509 reloc_range_list_entry
*prev
;
7510 Elf_Internal_Rela
*irel
;
7511 xtensa_opcode opcode
;
7515 struct reloc_range_list_struct
7517 /* The rest of the structure is only meaningful when ok is TRUE. */
7520 unsigned n_range
; /* Number of range markers. */
7521 reloc_range
*range
; /* Sorted range markers. */
7523 unsigned first
; /* Index of a first range element in the list. */
7524 unsigned last
; /* One past index of a last range element in the list. */
7526 unsigned n_list
; /* Number of list elements. */
7527 reloc_range_list_entry
*reloc
; /* */
7528 reloc_range_list_entry list_root
;
7532 reloc_range_compare (const void *a
, const void *b
)
7534 const reloc_range
*ra
= a
;
7535 const reloc_range
*rb
= b
;
7537 if (ra
->addr
!= rb
->addr
)
7538 return ra
->addr
< rb
->addr
? -1 : 1;
7539 if (ra
->add
!= rb
->add
)
7540 return ra
->add
? -1 : 1;
7545 build_reloc_ranges (bfd
*abfd
, asection
*sec
,
7547 Elf_Internal_Rela
*internal_relocs
,
7548 xtensa_opcode
*reloc_opcodes
,
7549 reloc_range_list
*list
)
7554 reloc_range
*ranges
= NULL
;
7555 reloc_range_list_entry
*reloc
=
7556 bfd_malloc (sec
->reloc_count
* sizeof (*reloc
));
7558 memset (list
, 0, sizeof (*list
));
7561 for (i
= 0; i
< sec
->reloc_count
; i
++)
7563 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7564 int r_type
= ELF32_R_TYPE (irel
->r_info
);
7565 reloc_howto_type
*howto
= &elf_howto_table
[r_type
];
7568 if (r_type
== R_XTENSA_ASM_SIMPLIFY
7569 || r_type
== R_XTENSA_32_PCREL
7570 || !howto
->pc_relative
)
7573 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7574 bfd_get_section_limit (abfd
, sec
));
7576 if (r_reloc_get_section (&r_rel
) != sec
)
7581 max_n
= (max_n
+ 2) * 2;
7582 ranges
= bfd_realloc (ranges
, max_n
* sizeof (*ranges
));
7585 ranges
[n
].addr
= irel
->r_offset
;
7586 ranges
[n
+ 1].addr
= r_rel
.target_offset
;
7588 ranges
[n
].add
= ranges
[n
].addr
< ranges
[n
+ 1].addr
;
7589 ranges
[n
+ 1].add
= !ranges
[n
].add
;
7591 ranges
[n
].irel_index
= i
;
7592 ranges
[n
+ 1].irel_index
= i
;
7596 reloc
[i
].irel
= irel
;
7598 /* Every relocation won't possibly be checked in the optimized version of
7599 check_section_ebb_pcrels_fit, so this needs to be done here. */
7600 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7602 /* None of the current alternate relocs are PC-relative,
7603 and only PC-relative relocs matter here. */
7607 xtensa_opcode opcode
;
7611 opcode
= reloc_opcodes
[i
];
7613 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7615 if (opcode
== XTENSA_UNDEFINED
)
7621 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7622 if (opnum
== XTENSA_UNDEFINED
)
7628 /* Record relocation opcode and opnum as we've calculated them
7629 anyway and they won't change. */
7630 reloc
[i
].opcode
= opcode
;
7631 reloc
[i
].opnum
= opnum
;
7637 ranges
= bfd_realloc (ranges
, n
* sizeof (*ranges
));
7638 qsort (ranges
, n
, sizeof (*ranges
), reloc_range_compare
);
7641 list
->range
= ranges
;
7642 list
->reloc
= reloc
;
7643 list
->list_root
.prev
= &list
->list_root
;
7644 list
->list_root
.next
= &list
->list_root
;
7653 static void reloc_range_list_append (reloc_range_list
*list
,
7654 unsigned irel_index
)
7656 reloc_range_list_entry
*entry
= list
->reloc
+ irel_index
;
7658 entry
->prev
= list
->list_root
.prev
;
7659 entry
->next
= &list
->list_root
;
7660 entry
->prev
->next
= entry
;
7661 entry
->next
->prev
= entry
;
7665 static void reloc_range_list_remove (reloc_range_list
*list
,
7666 unsigned irel_index
)
7668 reloc_range_list_entry
*entry
= list
->reloc
+ irel_index
;
7670 entry
->next
->prev
= entry
->prev
;
7671 entry
->prev
->next
= entry
->next
;
7675 /* Update relocation list object so that it lists all relocations that cross
7676 [first; last] range. Range bounds should not decrease with successive
7678 static void reloc_range_list_update_range (reloc_range_list
*list
,
7679 bfd_vma first
, bfd_vma last
)
7681 /* This should not happen: EBBs are iterated from lower addresses to higher.
7682 But even if that happens there's no need to break: just flush current list
7683 and start from scratch. */
7684 if ((list
->last
> 0 && list
->range
[list
->last
- 1].addr
> last
) ||
7685 (list
->first
> 0 && list
->range
[list
->first
- 1].addr
>= first
))
7690 list
->list_root
.next
= &list
->list_root
;
7691 list
->list_root
.prev
= &list
->list_root
;
7692 fprintf (stderr
, "%s: move backwards requested\n", __func__
);
7695 for (; list
->last
< list
->n_range
&&
7696 list
->range
[list
->last
].addr
<= last
; ++list
->last
)
7697 if (list
->range
[list
->last
].add
)
7698 reloc_range_list_append (list
, list
->range
[list
->last
].irel_index
);
7700 for (; list
->first
< list
->n_range
&&
7701 list
->range
[list
->first
].addr
< first
; ++list
->first
)
7702 if (!list
->range
[list
->first
].add
)
7703 reloc_range_list_remove (list
, list
->range
[list
->first
].irel_index
);
7706 static void free_reloc_range_list (reloc_range_list
*list
)
7712 /* The compute_text_actions function will build a list of potential
7713 transformation actions for code in the extended basic block of each
7714 longcall that is optimized to a direct call. From this list we
7715 generate a set of actions to actually perform that optimizes for
7716 space and, if not using size_opt, maintains branch target
7719 These actions to be performed are placed on a per-section list.
7720 The actual changes are performed by relax_section() in the second
7724 compute_text_actions (bfd
*abfd
,
7726 struct bfd_link_info
*link_info
)
7728 xtensa_opcode
*reloc_opcodes
= NULL
;
7729 xtensa_relax_info
*relax_info
;
7731 Elf_Internal_Rela
*internal_relocs
;
7732 bfd_boolean ok
= TRUE
;
7734 property_table_entry
*prop_table
= 0;
7736 bfd_size_type sec_size
;
7737 reloc_range_list relevant_relocs
;
7739 relax_info
= get_xtensa_relax_info (sec
);
7740 BFD_ASSERT (relax_info
);
7741 BFD_ASSERT (relax_info
->src_next
== relax_info
->src_count
);
7743 /* Do nothing if the section contains no optimized longcalls. */
7744 if (!relax_info
->is_relaxable_asm_section
)
7747 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7748 link_info
->keep_memory
);
7750 if (internal_relocs
)
7751 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7752 internal_reloc_compare
);
7754 sec_size
= bfd_get_section_limit (abfd
, sec
);
7755 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7756 if (contents
== NULL
&& sec_size
!= 0)
7762 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7763 XTENSA_PROP_SEC_NAME
, FALSE
);
7770 /* Precompute the opcode for each relocation. */
7771 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
, internal_relocs
);
7773 build_reloc_ranges (abfd
, sec
, contents
, internal_relocs
, reloc_opcodes
,
7776 for (i
= 0; i
< sec
->reloc_count
; i
++)
7778 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7780 property_table_entry
*the_entry
;
7783 ebb_constraint ebb_table
;
7784 bfd_size_type simplify_size
;
7786 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
7788 r_offset
= irel
->r_offset
;
7790 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
7791 if (simplify_size
== 0)
7794 /* xgettext:c-format */
7795 (_("%pB(%pA+%#" PRIx64
"): could not decode instruction for "
7796 "XTENSA_ASM_SIMPLIFY relocation; "
7797 "possible configuration mismatch"),
7798 sec
->owner
, sec
, (uint64_t) r_offset
);
7802 /* If the instruction table is not around, then don't do this
7804 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7805 sec
->vma
+ irel
->r_offset
);
7806 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
7808 text_action_add (&relax_info
->action_list
,
7809 ta_convert_longcall
, sec
, r_offset
,
7814 /* If the next longcall happens to be at the same address as an
7815 unreachable section of size 0, then skip forward. */
7816 ptbl_idx
= the_entry
- prop_table
;
7817 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
7818 && the_entry
->size
== 0
7819 && ptbl_idx
+ 1 < ptblsize
7820 && (prop_table
[ptbl_idx
+ 1].address
7821 == prop_table
[ptbl_idx
].address
))
7827 if (the_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
)
7828 /* NO_REORDER is OK */
7831 init_ebb_constraint (&ebb_table
);
7832 ebb
= &ebb_table
.ebb
;
7833 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
7834 internal_relocs
, sec
->reloc_count
);
7835 ebb
->start_offset
= r_offset
+ simplify_size
;
7836 ebb
->end_offset
= r_offset
+ simplify_size
;
7837 ebb
->start_ptbl_idx
= ptbl_idx
;
7838 ebb
->end_ptbl_idx
= ptbl_idx
;
7839 ebb
->start_reloc_idx
= i
;
7840 ebb
->end_reloc_idx
= i
;
7842 if (!extend_ebb_bounds (ebb
)
7843 || !compute_ebb_proposed_actions (&ebb_table
)
7844 || !compute_ebb_actions (&ebb_table
)
7845 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
7848 &ebb_table
, reloc_opcodes
)
7849 || !check_section_ebb_reduces (&ebb_table
))
7851 /* If anything goes wrong or we get unlucky and something does
7852 not fit, with our plan because of expansion between
7853 critical branches, just convert to a NOP. */
7855 text_action_add (&relax_info
->action_list
,
7856 ta_convert_longcall
, sec
, r_offset
, 0);
7857 i
= ebb_table
.ebb
.end_reloc_idx
;
7858 free_ebb_constraint (&ebb_table
);
7862 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
7864 /* Update the index so we do not go looking at the relocations
7865 we have already processed. */
7866 i
= ebb_table
.ebb
.end_reloc_idx
;
7867 free_ebb_constraint (&ebb_table
);
7870 free_reloc_range_list (&relevant_relocs
);
7873 if (action_list_count (&relax_info
->action_list
))
7874 print_action_list (stderr
, &relax_info
->action_list
);
7878 release_contents (sec
, contents
);
7879 release_internal_relocs (sec
, internal_relocs
);
7881 free (reloc_opcodes
);
7887 /* Do not widen an instruction if it is preceeded by a
7888 loop opcode. It might cause misalignment. */
7891 prev_instr_is_a_loop (bfd_byte
*contents
,
7892 bfd_size_type content_length
,
7893 bfd_size_type offset
)
7895 xtensa_opcode prev_opcode
;
7899 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
7900 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
7904 /* Find all of the possible actions for an extended basic block. */
7907 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
7909 const ebb_t
*ebb
= &ebb_table
->ebb
;
7910 unsigned rel_idx
= ebb
->start_reloc_idx
;
7911 property_table_entry
*entry
, *start_entry
, *end_entry
;
7913 xtensa_isa isa
= xtensa_default_isa
;
7915 static xtensa_insnbuf insnbuf
= NULL
;
7916 static xtensa_insnbuf slotbuf
= NULL
;
7918 if (insnbuf
== NULL
)
7920 insnbuf
= xtensa_insnbuf_alloc (isa
);
7921 slotbuf
= xtensa_insnbuf_alloc (isa
);
7924 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
7925 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
7927 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
7929 bfd_vma start_offset
, end_offset
;
7930 bfd_size_type insn_len
;
7932 start_offset
= entry
->address
- ebb
->sec
->vma
;
7933 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
7935 if (entry
== start_entry
)
7936 start_offset
= ebb
->start_offset
;
7937 if (entry
== end_entry
)
7938 end_offset
= ebb
->end_offset
;
7939 offset
= start_offset
;
7941 if (offset
== entry
->address
- ebb
->sec
->vma
7942 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
7944 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
7945 BFD_ASSERT (offset
!= end_offset
);
7946 if (offset
== end_offset
)
7949 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
7954 if (check_branch_target_aligned_address (offset
, insn_len
))
7955 align_type
= EBB_REQUIRE_TGT_ALIGN
;
7957 ebb_propose_action (ebb_table
, align_type
, 0,
7958 ta_none
, offset
, 0, TRUE
);
7961 while (offset
!= end_offset
)
7963 Elf_Internal_Rela
*irel
;
7964 xtensa_opcode opcode
;
7966 while (rel_idx
< ebb
->end_reloc_idx
7967 && (ebb
->relocs
[rel_idx
].r_offset
< offset
7968 || (ebb
->relocs
[rel_idx
].r_offset
== offset
7969 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
7970 != R_XTENSA_ASM_SIMPLIFY
))))
7973 /* Check for longcall. */
7974 irel
= &ebb
->relocs
[rel_idx
];
7975 if (irel
->r_offset
== offset
7976 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
7978 bfd_size_type simplify_size
;
7980 simplify_size
= get_asm_simplify_size (ebb
->contents
,
7981 ebb
->content_length
,
7983 if (simplify_size
== 0)
7986 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
7987 ta_convert_longcall
, offset
, 0, TRUE
);
7989 offset
+= simplify_size
;
7993 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
7995 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
7996 ebb
->content_length
- offset
);
7997 fmt
= xtensa_format_decode (isa
, insnbuf
);
7998 if (fmt
== XTENSA_UNDEFINED
)
8000 insn_len
= xtensa_format_length (isa
, fmt
);
8001 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
8004 if (xtensa_format_num_slots (isa
, fmt
) != 1)
8010 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
8011 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
8012 if (opcode
== XTENSA_UNDEFINED
)
8015 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
8016 && (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
8017 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
8019 /* Add an instruction narrow action. */
8020 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
8021 ta_narrow_insn
, offset
, 0, FALSE
);
8023 else if ((entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
8024 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
8025 && ! prev_instr_is_a_loop (ebb
->contents
,
8026 ebb
->content_length
, offset
))
8028 /* Add an instruction widen action. */
8029 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
8030 ta_widen_insn
, offset
, 0, FALSE
);
8032 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
8034 /* Check for branch targets. */
8035 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
8036 ta_none
, offset
, 0, TRUE
);
8043 if (ebb
->ends_unreachable
)
8045 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
8046 ta_fill
, ebb
->end_offset
, 0, TRUE
);
8053 /* xgettext:c-format */
8054 (_("%pB(%pA+%#" PRIx64
"): could not decode instruction; "
8055 "possible configuration mismatch"),
8056 ebb
->sec
->owner
, ebb
->sec
, (uint64_t) offset
);
8061 /* After all of the information has collected about the
8062 transformations possible in an EBB, compute the appropriate actions
8063 here in compute_ebb_actions. We still must check later to make
8064 sure that the actions do not break any relocations. The algorithm
8065 used here is pretty greedy. Basically, it removes as many no-ops
8066 as possible so that the end of the EBB has the same alignment
8067 characteristics as the original. First, it uses narrowing, then
8068 fill space at the end of the EBB, and finally widenings. If that
8069 does not work, it tries again with one fewer no-op removed. The
8070 optimization will only be performed if all of the branch targets
8071 that were aligned before transformation are also aligned after the
8074 When the size_opt flag is set, ignore the branch target alignments,
8075 narrow all wide instructions, and remove all no-ops unless the end
8076 of the EBB prevents it. */
8079 compute_ebb_actions (ebb_constraint
*ebb_table
)
8083 int removed_bytes
= 0;
8084 ebb_t
*ebb
= &ebb_table
->ebb
;
8085 unsigned seg_idx_start
= 0;
8086 unsigned seg_idx_end
= 0;
8088 /* We perform this like the assembler relaxation algorithm: Start by
8089 assuming all instructions are narrow and all no-ops removed; then
8092 /* For each segment of this that has a solid constraint, check to
8093 see if there are any combinations that will keep the constraint.
8095 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
8097 bfd_boolean requires_text_end_align
= FALSE
;
8098 unsigned longcall_count
= 0;
8099 unsigned longcall_convert_count
= 0;
8100 unsigned narrowable_count
= 0;
8101 unsigned narrowable_convert_count
= 0;
8102 unsigned widenable_count
= 0;
8103 unsigned widenable_convert_count
= 0;
8105 proposed_action
*action
= NULL
;
8106 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
8108 seg_idx_start
= seg_idx_end
;
8110 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
8112 action
= &ebb_table
->actions
[i
];
8113 if (action
->action
== ta_convert_longcall
)
8115 if (action
->action
== ta_narrow_insn
)
8117 if (action
->action
== ta_widen_insn
)
8119 if (action
->action
== ta_fill
)
8121 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
8123 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
8124 && !elf32xtensa_size_opt
)
8129 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
8130 requires_text_end_align
= TRUE
;
8132 if (elf32xtensa_size_opt
&& !requires_text_end_align
8133 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
8134 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
8136 longcall_convert_count
= longcall_count
;
8137 narrowable_convert_count
= narrowable_count
;
8138 widenable_convert_count
= 0;
8142 /* There is a constraint. Convert the max number of longcalls. */
8143 narrowable_convert_count
= 0;
8144 longcall_convert_count
= 0;
8145 widenable_convert_count
= 0;
8147 for (j
= 0; j
< longcall_count
; j
++)
8149 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
8150 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
8151 unsigned desire_widen
= removed
;
8152 if (desire_narrow
<= narrowable_count
)
8154 narrowable_convert_count
= desire_narrow
;
8155 narrowable_convert_count
+=
8156 (align
* ((narrowable_count
- narrowable_convert_count
)
8158 longcall_convert_count
= (longcall_count
- j
);
8159 widenable_convert_count
= 0;
8162 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
8164 narrowable_convert_count
= 0;
8165 longcall_convert_count
= longcall_count
- j
;
8166 widenable_convert_count
= desire_widen
;
8172 /* Now the number of conversions are saved. Do them. */
8173 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
8175 action
= &ebb_table
->actions
[i
];
8176 switch (action
->action
)
8178 case ta_convert_longcall
:
8179 if (longcall_convert_count
!= 0)
8181 action
->action
= ta_remove_longcall
;
8182 action
->do_action
= TRUE
;
8183 action
->removed_bytes
+= 3;
8184 longcall_convert_count
--;
8187 case ta_narrow_insn
:
8188 if (narrowable_convert_count
!= 0)
8190 action
->do_action
= TRUE
;
8191 action
->removed_bytes
+= 1;
8192 narrowable_convert_count
--;
8196 if (widenable_convert_count
!= 0)
8198 action
->do_action
= TRUE
;
8199 action
->removed_bytes
-= 1;
8200 widenable_convert_count
--;
8209 /* Now we move on to some local opts. Try to remove each of the
8210 remaining longcalls. */
8212 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
8215 for (i
= 0; i
< ebb_table
->action_count
; i
++)
8217 int old_removed_bytes
= removed_bytes
;
8218 proposed_action
*action
= &ebb_table
->actions
[i
];
8220 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
8222 bfd_boolean bad_alignment
= FALSE
;
8224 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
8226 proposed_action
*new_action
= &ebb_table
->actions
[j
];
8227 bfd_vma offset
= new_action
->offset
;
8228 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
8230 if (!check_branch_target_aligned
8231 (ebb_table
->ebb
.contents
,
8232 ebb_table
->ebb
.content_length
,
8233 offset
, offset
- removed_bytes
))
8235 bad_alignment
= TRUE
;
8239 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
8241 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
8242 ebb_table
->ebb
.content_length
,
8244 offset
- removed_bytes
))
8246 bad_alignment
= TRUE
;
8250 if (new_action
->action
== ta_narrow_insn
8251 && !new_action
->do_action
8252 && ebb_table
->ebb
.sec
->alignment_power
== 2)
8254 /* Narrow an instruction and we are done. */
8255 new_action
->do_action
= TRUE
;
8256 new_action
->removed_bytes
+= 1;
8257 bad_alignment
= FALSE
;
8260 if (new_action
->action
== ta_widen_insn
8261 && new_action
->do_action
8262 && ebb_table
->ebb
.sec
->alignment_power
== 2)
8264 /* Narrow an instruction and we are done. */
8265 new_action
->do_action
= FALSE
;
8266 new_action
->removed_bytes
+= 1;
8267 bad_alignment
= FALSE
;
8270 if (new_action
->do_action
)
8271 removed_bytes
+= new_action
->removed_bytes
;
8275 action
->removed_bytes
+= 3;
8276 action
->action
= ta_remove_longcall
;
8277 action
->do_action
= TRUE
;
8280 removed_bytes
= old_removed_bytes
;
8281 if (action
->do_action
)
8282 removed_bytes
+= action
->removed_bytes
;
8287 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
8289 proposed_action
*action
= &ebb_table
->actions
[i
];
8290 if (action
->do_action
)
8291 removed_bytes
+= action
->removed_bytes
;
8294 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
8295 && ebb
->ends_unreachable
)
8297 proposed_action
*action
;
8301 BFD_ASSERT (ebb_table
->action_count
!= 0);
8302 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
8303 BFD_ASSERT (action
->action
== ta_fill
);
8304 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
8306 extra_space
= xtensa_compute_fill_extra_space (ebb
->ends_unreachable
);
8307 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
8308 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
8310 action
->removed_bytes
= extra_space
- br
;
8316 /* The xlate_map is a sorted array of address mappings designed to
8317 answer the offset_with_removed_text() query with a binary search instead
8318 of a linear search through the section's action_list. */
8320 typedef struct xlate_map_entry xlate_map_entry_t
;
8321 typedef struct xlate_map xlate_map_t
;
8323 struct xlate_map_entry
8325 bfd_vma orig_address
;
8326 bfd_vma new_address
;
8332 unsigned entry_count
;
8333 xlate_map_entry_t
*entry
;
8338 xlate_compare (const void *a_v
, const void *b_v
)
8340 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
8341 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
8342 if (a
->orig_address
< b
->orig_address
)
8344 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
8351 xlate_offset_with_removed_text (const xlate_map_t
*map
,
8352 text_action_list
*action_list
,
8356 xlate_map_entry_t
*e
;
8357 struct xlate_map_entry se
;
8360 return offset_with_removed_text (action_list
, offset
);
8362 if (map
->entry_count
== 0)
8365 se
.orig_address
= offset
;
8366 r
= bsearch (&se
, map
->entry
, map
->entry_count
,
8367 sizeof (xlate_map_entry_t
), &xlate_compare
);
8368 e
= (xlate_map_entry_t
*) r
;
8370 /* There could be a jump past the end of the section,
8371 allow it using the last xlate map entry to translate its address. */
8374 e
= map
->entry
+ map
->entry_count
- 1;
8375 if (xlate_compare (&se
, e
) <= 0)
8378 BFD_ASSERT (e
!= NULL
);
8381 return e
->new_address
- e
->orig_address
+ offset
;
8384 typedef struct xlate_map_context_struct xlate_map_context
;
8385 struct xlate_map_context_struct
8388 xlate_map_entry_t
*current_entry
;
8393 xlate_map_fn (splay_tree_node node
, void *p
)
8395 text_action
*r
= (text_action
*)node
->value
;
8396 xlate_map_context
*ctx
= p
;
8397 unsigned orig_size
= 0;
8402 case ta_remove_insn
:
8403 case ta_convert_longcall
:
8404 case ta_remove_literal
:
8405 case ta_add_literal
:
8407 case ta_remove_longcall
:
8410 case ta_narrow_insn
:
8419 ctx
->current_entry
->size
=
8420 r
->offset
+ orig_size
- ctx
->current_entry
->orig_address
;
8421 if (ctx
->current_entry
->size
!= 0)
8423 ctx
->current_entry
++;
8424 ctx
->map
->entry_count
++;
8426 ctx
->current_entry
->orig_address
= r
->offset
+ orig_size
;
8427 ctx
->removed
+= r
->removed_bytes
;
8428 ctx
->current_entry
->new_address
= r
->offset
+ orig_size
- ctx
->removed
;
8429 ctx
->current_entry
->size
= 0;
8433 /* Build a binary searchable offset translation map from a section's
8436 static xlate_map_t
*
8437 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
8439 text_action_list
*action_list
= &relax_info
->action_list
;
8440 unsigned num_actions
= 0;
8441 xlate_map_context ctx
;
8443 ctx
.map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
8445 if (ctx
.map
== NULL
)
8448 num_actions
= action_list_count (action_list
);
8449 ctx
.map
->entry
= (xlate_map_entry_t
*)
8450 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
8451 if (ctx
.map
->entry
== NULL
)
8456 ctx
.map
->entry_count
= 0;
8459 ctx
.current_entry
= &ctx
.map
->entry
[0];
8461 ctx
.current_entry
->orig_address
= 0;
8462 ctx
.current_entry
->new_address
= 0;
8463 ctx
.current_entry
->size
= 0;
8465 splay_tree_foreach (action_list
->tree
, xlate_map_fn
, &ctx
);
8467 ctx
.current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
8468 - ctx
.current_entry
->orig_address
);
8469 if (ctx
.current_entry
->size
!= 0)
8470 ctx
.map
->entry_count
++;
8476 /* Free an offset translation map. */
8479 free_xlate_map (xlate_map_t
*map
)
8489 /* Use check_section_ebb_pcrels_fit to make sure that all of the
8490 relocations in a section will fit if a proposed set of actions
8494 check_section_ebb_pcrels_fit (bfd
*abfd
,
8497 Elf_Internal_Rela
*internal_relocs
,
8498 reloc_range_list
*relevant_relocs
,
8499 const ebb_constraint
*constraint
,
8500 const xtensa_opcode
*reloc_opcodes
)
8503 unsigned n
= sec
->reloc_count
;
8504 Elf_Internal_Rela
*irel
;
8505 xlate_map_t
*xmap
= NULL
;
8506 bfd_boolean ok
= TRUE
;
8507 xtensa_relax_info
*relax_info
;
8508 reloc_range_list_entry
*entry
= NULL
;
8510 relax_info
= get_xtensa_relax_info (sec
);
8512 if (relax_info
&& sec
->reloc_count
> 100)
8514 xmap
= build_xlate_map (sec
, relax_info
);
8515 /* NULL indicates out of memory, but the slow version
8516 can still be used. */
8519 if (relevant_relocs
&& constraint
->action_count
)
8521 if (!relevant_relocs
->ok
)
8528 bfd_vma min_offset
, max_offset
;
8529 min_offset
= max_offset
= constraint
->actions
[0].offset
;
8531 for (i
= 1; i
< constraint
->action_count
; ++i
)
8533 proposed_action
*action
= &constraint
->actions
[i
];
8534 bfd_vma offset
= action
->offset
;
8536 if (offset
< min_offset
)
8537 min_offset
= offset
;
8538 if (offset
> max_offset
)
8539 max_offset
= offset
;
8541 reloc_range_list_update_range (relevant_relocs
, min_offset
,
8543 n
= relevant_relocs
->n_list
;
8544 entry
= &relevant_relocs
->list_root
;
8549 relevant_relocs
= NULL
;
8552 for (i
= 0; i
< n
; i
++)
8555 bfd_vma orig_self_offset
, orig_target_offset
;
8556 bfd_vma self_offset
, target_offset
;
8558 reloc_howto_type
*howto
;
8559 int self_removed_bytes
, target_removed_bytes
;
8561 if (relevant_relocs
)
8563 entry
= entry
->next
;
8568 irel
= internal_relocs
+ i
;
8570 r_type
= ELF32_R_TYPE (irel
->r_info
);
8572 howto
= &elf_howto_table
[r_type
];
8573 /* We maintain the required invariant: PC-relative relocations
8574 that fit before linking must fit after linking. Thus we only
8575 need to deal with relocations to the same section that are
8577 if (r_type
== R_XTENSA_ASM_SIMPLIFY
8578 || r_type
== R_XTENSA_32_PCREL
8579 || !howto
->pc_relative
)
8582 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8583 bfd_get_section_limit (abfd
, sec
));
8585 if (r_reloc_get_section (&r_rel
) != sec
)
8588 orig_self_offset
= irel
->r_offset
;
8589 orig_target_offset
= r_rel
.target_offset
;
8591 self_offset
= orig_self_offset
;
8592 target_offset
= orig_target_offset
;
8597 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
8600 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
8601 orig_target_offset
);
8604 self_removed_bytes
= 0;
8605 target_removed_bytes
= 0;
8607 for (j
= 0; j
< constraint
->action_count
; ++j
)
8609 proposed_action
*action
= &constraint
->actions
[j
];
8610 bfd_vma offset
= action
->offset
;
8611 int removed_bytes
= action
->removed_bytes
;
8612 if (offset
< orig_self_offset
8613 || (offset
== orig_self_offset
&& action
->action
== ta_fill
8614 && action
->removed_bytes
< 0))
8615 self_removed_bytes
+= removed_bytes
;
8616 if (offset
< orig_target_offset
8617 || (offset
== orig_target_offset
&& action
->action
== ta_fill
8618 && action
->removed_bytes
< 0))
8619 target_removed_bytes
+= removed_bytes
;
8621 self_offset
-= self_removed_bytes
;
8622 target_offset
-= target_removed_bytes
;
8624 /* Try to encode it. Get the operand and check. */
8625 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
8627 /* None of the current alternate relocs are PC-relative,
8628 and only PC-relative relocs matter here. */
8632 xtensa_opcode opcode
;
8635 if (relevant_relocs
)
8637 opcode
= entry
->opcode
;
8638 opnum
= entry
->opnum
;
8643 opcode
= reloc_opcodes
[relevant_relocs
?
8644 (unsigned)(entry
- relevant_relocs
->reloc
) : i
];
8646 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
8647 if (opcode
== XTENSA_UNDEFINED
)
8653 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
8654 if (opnum
== XTENSA_UNDEFINED
)
8661 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
8669 free_xlate_map (xmap
);
8676 check_section_ebb_reduces (const ebb_constraint
*constraint
)
8681 for (i
= 0; i
< constraint
->action_count
; i
++)
8683 const proposed_action
*action
= &constraint
->actions
[i
];
8684 if (action
->do_action
)
8685 removed
+= action
->removed_bytes
;
8695 text_action_add_proposed (text_action_list
*l
,
8696 const ebb_constraint
*ebb_table
,
8701 for (i
= 0; i
< ebb_table
->action_count
; i
++)
8703 proposed_action
*action
= &ebb_table
->actions
[i
];
8705 if (!action
->do_action
)
8707 switch (action
->action
)
8709 case ta_remove_insn
:
8710 case ta_remove_longcall
:
8711 case ta_convert_longcall
:
8712 case ta_narrow_insn
:
8715 case ta_remove_literal
:
8716 text_action_add (l
, action
->action
, sec
, action
->offset
,
8717 action
->removed_bytes
);
8730 xtensa_compute_fill_extra_space (property_table_entry
*entry
)
8732 int fill_extra_space
;
8737 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
8740 fill_extra_space
= entry
->size
;
8741 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
8743 /* Fill bytes for alignment:
8744 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
8745 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
8746 int nsm
= (1 << pow
) - 1;
8747 bfd_vma addr
= entry
->address
+ entry
->size
;
8748 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
8749 fill_extra_space
+= align_fill
;
8751 return fill_extra_space
;
8755 /* First relaxation pass. */
8757 /* If the section contains relaxable literals, check each literal to
8758 see if it has the same value as another literal that has already
8759 been seen, either in the current section or a previous one. If so,
8760 add an entry to the per-section list of removed literals. The
8761 actual changes are deferred until the next pass. */
8764 compute_removed_literals (bfd
*abfd
,
8766 struct bfd_link_info
*link_info
,
8767 value_map_hash_table
*values
)
8769 xtensa_relax_info
*relax_info
;
8771 Elf_Internal_Rela
*internal_relocs
;
8772 source_reloc
*src_relocs
, *rel
;
8773 bfd_boolean ok
= TRUE
;
8774 property_table_entry
*prop_table
= NULL
;
8777 bfd_boolean last_loc_is_prev
= FALSE
;
8778 bfd_vma last_target_offset
= 0;
8779 section_cache_t target_sec_cache
;
8780 bfd_size_type sec_size
;
8782 init_section_cache (&target_sec_cache
);
8784 /* Do nothing if it is not a relaxable literal section. */
8785 relax_info
= get_xtensa_relax_info (sec
);
8786 BFD_ASSERT (relax_info
);
8787 if (!relax_info
->is_relaxable_literal_section
)
8790 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8791 link_info
->keep_memory
);
8793 sec_size
= bfd_get_section_limit (abfd
, sec
);
8794 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8795 if (contents
== NULL
&& sec_size
!= 0)
8801 /* Sort the source_relocs by target offset. */
8802 src_relocs
= relax_info
->src_relocs
;
8803 qsort (src_relocs
, relax_info
->src_count
,
8804 sizeof (source_reloc
), source_reloc_compare
);
8805 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
8806 internal_reloc_compare
);
8808 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
8809 XTENSA_PROP_SEC_NAME
, FALSE
);
8817 for (i
= 0; i
< relax_info
->src_count
; i
++)
8819 Elf_Internal_Rela
*irel
= NULL
;
8821 rel
= &src_relocs
[i
];
8822 if (get_l32r_opcode () != rel
->opcode
)
8824 irel
= get_irel_at_offset (sec
, internal_relocs
,
8825 rel
->r_rel
.target_offset
);
8827 /* If the relocation on this is not a simple R_XTENSA_32 or
8828 R_XTENSA_PLT then do not consider it. This may happen when
8829 the difference of two symbols is used in a literal. */
8830 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
8831 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
8834 /* If the target_offset for this relocation is the same as the
8835 previous relocation, then we've already considered whether the
8836 literal can be coalesced. Skip to the next one.... */
8837 if (i
!= 0 && prev_i
!= -1
8838 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
8842 if (last_loc_is_prev
&&
8843 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
8844 last_loc_is_prev
= FALSE
;
8846 /* Check if the relocation was from an L32R that is being removed
8847 because a CALLX was converted to a direct CALL, and check if
8848 there are no other relocations to the literal. */
8849 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
,
8850 sec
, prop_table
, ptblsize
))
8852 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
8853 irel
, rel
, prop_table
, ptblsize
))
8858 last_target_offset
= rel
->r_rel
.target_offset
;
8862 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
8864 &last_loc_is_prev
, irel
,
8865 relax_info
->src_count
- i
, rel
,
8866 prop_table
, ptblsize
,
8867 &target_sec_cache
, rel
->is_abs_literal
))
8872 last_target_offset
= rel
->r_rel
.target_offset
;
8876 print_removed_literals (stderr
, &relax_info
->removed_list
);
8877 print_action_list (stderr
, &relax_info
->action_list
);
8882 free_section_cache (&target_sec_cache
);
8884 release_contents (sec
, contents
);
8885 release_internal_relocs (sec
, internal_relocs
);
8890 static Elf_Internal_Rela
*
8891 get_irel_at_offset (asection
*sec
,
8892 Elf_Internal_Rela
*internal_relocs
,
8896 Elf_Internal_Rela
*irel
;
8898 Elf_Internal_Rela key
;
8900 if (!internal_relocs
)
8903 key
.r_offset
= offset
;
8904 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
8905 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
8909 /* bsearch does not guarantee which will be returned if there are
8910 multiple matches. We need the first that is not an alignment. */
8911 i
= irel
- internal_relocs
;
8914 if (internal_relocs
[i
-1].r_offset
!= offset
)
8918 for ( ; i
< sec
->reloc_count
; i
++)
8920 irel
= &internal_relocs
[i
];
8921 r_type
= ELF32_R_TYPE (irel
->r_info
);
8922 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
8931 is_removable_literal (const source_reloc
*rel
,
8933 const source_reloc
*src_relocs
,
8936 property_table_entry
*prop_table
,
8939 const source_reloc
*curr_rel
;
8940 property_table_entry
*entry
;
8945 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8946 sec
->vma
+ rel
->r_rel
.target_offset
);
8947 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
8950 for (++i
; i
< src_count
; ++i
)
8952 curr_rel
= &src_relocs
[i
];
8953 /* If all others have the same target offset.... */
8954 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
8957 if (!curr_rel
->is_null
8958 && !xtensa_is_property_section (curr_rel
->source_sec
)
8959 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
8967 remove_dead_literal (bfd
*abfd
,
8969 struct bfd_link_info
*link_info
,
8970 Elf_Internal_Rela
*internal_relocs
,
8971 Elf_Internal_Rela
*irel
,
8973 property_table_entry
*prop_table
,
8976 property_table_entry
*entry
;
8977 xtensa_relax_info
*relax_info
;
8979 relax_info
= get_xtensa_relax_info (sec
);
8983 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8984 sec
->vma
+ rel
->r_rel
.target_offset
);
8986 /* Mark the unused literal so that it will be removed. */
8987 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
8989 text_action_add (&relax_info
->action_list
,
8990 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
8992 /* If the section is 4-byte aligned, do not add fill. */
8993 if (sec
->alignment_power
> 2)
8995 int fill_extra_space
;
8996 bfd_vma entry_sec_offset
;
8998 property_table_entry
*the_add_entry
;
9002 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
9004 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
9006 /* If the literal range is at the end of the section,
9008 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
9010 fill_extra_space
= xtensa_compute_fill_extra_space (the_add_entry
);
9012 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
9013 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
9014 -4, fill_extra_space
);
9016 adjust_fill_action (fa
, removed_diff
);
9018 text_action_add (&relax_info
->action_list
,
9019 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
9022 /* Zero out the relocation on this literal location. */
9025 if (elf_hash_table (link_info
)->dynamic_sections_created
)
9026 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
9028 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9029 pin_internal_relocs (sec
, internal_relocs
);
9032 /* Do not modify "last_loc_is_prev". */
9038 identify_literal_placement (bfd
*abfd
,
9041 struct bfd_link_info
*link_info
,
9042 value_map_hash_table
*values
,
9043 bfd_boolean
*last_loc_is_prev_p
,
9044 Elf_Internal_Rela
*irel
,
9045 int remaining_src_rels
,
9047 property_table_entry
*prop_table
,
9049 section_cache_t
*target_sec_cache
,
9050 bfd_boolean is_abs_literal
)
9054 xtensa_relax_info
*relax_info
;
9055 bfd_boolean literal_placed
= FALSE
;
9057 unsigned long value
;
9058 bfd_boolean final_static_link
;
9059 bfd_size_type sec_size
;
9061 relax_info
= get_xtensa_relax_info (sec
);
9065 sec_size
= bfd_get_section_limit (abfd
, sec
);
9068 (!bfd_link_relocatable (link_info
)
9069 && !elf_hash_table (link_info
)->dynamic_sections_created
);
9071 /* The placement algorithm first checks to see if the literal is
9072 already in the value map. If so and the value map is reachable
9073 from all uses, then the literal is moved to that location. If
9074 not, then we identify the last location where a fresh literal was
9075 placed. If the literal can be safely moved there, then we do so.
9076 If not, then we assume that the literal is not to move and leave
9077 the literal where it is, marking it as the last literal
9080 /* Find the literal value. */
9082 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
9085 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
9086 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
9088 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
9090 /* Check if we've seen another literal with the same value that
9091 is in the same output section. */
9092 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
9095 && (r_reloc_get_section (&val_map
->loc
)->output_section
9096 == sec
->output_section
)
9097 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
9098 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
9100 /* No change to last_loc_is_prev. */
9101 literal_placed
= TRUE
;
9104 /* For relocatable links, do not try to move literals. To do it
9105 correctly might increase the number of relocations in an input
9106 section making the default relocatable linking fail. */
9107 if (!bfd_link_relocatable (link_info
) && !literal_placed
9108 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
9110 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
9111 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
9113 /* Increment the virtual offset. */
9114 r_reloc try_loc
= values
->last_loc
;
9115 try_loc
.virtual_offset
+= 4;
9117 /* There is a last loc that was in the same output section. */
9118 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
9119 && move_shared_literal (sec
, link_info
, rel
,
9120 prop_table
, ptblsize
,
9121 &try_loc
, &val
, target_sec_cache
))
9123 values
->last_loc
.virtual_offset
+= 4;
9124 literal_placed
= TRUE
;
9126 val_map
= add_value_map (values
, &val
, &try_loc
,
9129 val_map
->loc
= try_loc
;
9134 if (!literal_placed
)
9136 /* Nothing worked, leave the literal alone but update the last loc. */
9137 values
->has_last_loc
= TRUE
;
9138 values
->last_loc
= rel
->r_rel
;
9140 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
9142 val_map
->loc
= rel
->r_rel
;
9143 *last_loc_is_prev_p
= TRUE
;
9150 /* Check if the original relocations (presumably on L32R instructions)
9151 identified by reloc[0..N] can be changed to reference the literal
9152 identified by r_rel. If r_rel is out of range for any of the
9153 original relocations, then we don't want to coalesce the original
9154 literal with the one at r_rel. We only check reloc[0..N], where the
9155 offsets are all the same as for reloc[0] (i.e., they're all
9156 referencing the same literal) and where N is also bounded by the
9157 number of remaining entries in the "reloc" array. The "reloc" array
9158 is sorted by target offset so we know all the entries for the same
9159 literal will be contiguous. */
9162 relocations_reach (source_reloc
*reloc
,
9163 int remaining_relocs
,
9164 const r_reloc
*r_rel
)
9166 bfd_vma from_offset
, source_address
, dest_address
;
9170 if (!r_reloc_is_defined (r_rel
))
9173 sec
= r_reloc_get_section (r_rel
);
9174 from_offset
= reloc
[0].r_rel
.target_offset
;
9176 for (i
= 0; i
< remaining_relocs
; i
++)
9178 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
9181 /* Ignore relocations that have been removed. */
9182 if (reloc
[i
].is_null
)
9185 /* The original and new output section for these must be the same
9186 in order to coalesce. */
9187 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
9188 != sec
->output_section
)
9191 /* Absolute literals in the same output section can always be
9193 if (reloc
[i
].is_abs_literal
)
9196 /* A literal with no PC-relative relocations can be moved anywhere. */
9197 if (reloc
[i
].opnd
!= -1)
9199 /* Otherwise, check to see that it fits. */
9200 source_address
= (reloc
[i
].source_sec
->output_section
->vma
9201 + reloc
[i
].source_sec
->output_offset
9202 + reloc
[i
].r_rel
.rela
.r_offset
);
9203 dest_address
= (sec
->output_section
->vma
9204 + sec
->output_offset
9205 + r_rel
->target_offset
);
9207 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
9208 source_address
, dest_address
))
9217 /* Move a literal to another literal location because it is
9218 the same as the other literal value. */
9221 coalesce_shared_literal (asection
*sec
,
9223 property_table_entry
*prop_table
,
9227 property_table_entry
*entry
;
9229 property_table_entry
*the_add_entry
;
9231 xtensa_relax_info
*relax_info
;
9233 relax_info
= get_xtensa_relax_info (sec
);
9237 entry
= elf_xtensa_find_property_entry
9238 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
9239 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
9242 /* Mark that the literal will be coalesced. */
9243 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
9245 text_action_add (&relax_info
->action_list
,
9246 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
9248 /* If the section is 4-byte aligned, do not add fill. */
9249 if (sec
->alignment_power
> 2)
9251 int fill_extra_space
;
9252 bfd_vma entry_sec_offset
;
9255 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
9257 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
9259 /* If the literal range is at the end of the section,
9261 fill_extra_space
= 0;
9262 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
9264 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9265 fill_extra_space
= the_add_entry
->size
;
9267 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
9268 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
9269 -4, fill_extra_space
);
9271 adjust_fill_action (fa
, removed_diff
);
9273 text_action_add (&relax_info
->action_list
,
9274 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
9281 /* Move a literal to another location. This may actually increase the
9282 total amount of space used because of alignments so we need to do
9283 this carefully. Also, it may make a branch go out of range. */
9286 move_shared_literal (asection
*sec
,
9287 struct bfd_link_info
*link_info
,
9289 property_table_entry
*prop_table
,
9291 const r_reloc
*target_loc
,
9292 const literal_value
*lit_value
,
9293 section_cache_t
*target_sec_cache
)
9295 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
9296 text_action
*fa
, *target_fa
;
9298 xtensa_relax_info
*relax_info
, *target_relax_info
;
9299 asection
*target_sec
;
9301 ebb_constraint ebb_table
;
9302 bfd_boolean relocs_fit
;
9304 /* If this routine always returns FALSE, the literals that cannot be
9305 coalesced will not be moved. */
9306 if (elf32xtensa_no_literal_movement
)
9309 relax_info
= get_xtensa_relax_info (sec
);
9313 target_sec
= r_reloc_get_section (target_loc
);
9314 target_relax_info
= get_xtensa_relax_info (target_sec
);
9316 /* Literals to undefined sections may not be moved because they
9317 must report an error. */
9318 if (bfd_is_und_section (target_sec
))
9321 src_entry
= elf_xtensa_find_property_entry
9322 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
9324 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
9327 target_entry
= elf_xtensa_find_property_entry
9328 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
9329 target_sec
->vma
+ target_loc
->target_offset
);
9334 /* Make sure that we have not broken any branches. */
9337 init_ebb_constraint (&ebb_table
);
9338 ebb
= &ebb_table
.ebb
;
9339 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
9340 target_sec_cache
->content_length
,
9341 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
9342 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
9344 /* Propose to add 4 bytes + worst-case alignment size increase to
9346 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
9347 ta_fill
, target_loc
->target_offset
,
9348 -4 - (1 << target_sec
->alignment_power
), TRUE
);
9350 /* Check all of the PC-relative relocations to make sure they still fit. */
9351 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
9352 target_sec_cache
->contents
,
9353 target_sec_cache
->relocs
, NULL
,
9359 text_action_add_literal (&target_relax_info
->action_list
,
9360 ta_add_literal
, target_loc
, lit_value
, -4);
9362 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
9364 /* May need to add or remove some fill to maintain alignment. */
9365 int fill_extra_space
;
9366 bfd_vma entry_sec_offset
;
9369 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
9371 /* If the literal range is at the end of the section,
9373 fill_extra_space
= 0;
9375 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
9376 target_sec_cache
->pte_count
,
9378 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9379 fill_extra_space
= the_add_entry
->size
;
9381 target_fa
= find_fill_action (&target_relax_info
->action_list
,
9382 target_sec
, entry_sec_offset
);
9383 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
9384 entry_sec_offset
, 4,
9387 adjust_fill_action (target_fa
, removed_diff
);
9389 text_action_add (&target_relax_info
->action_list
,
9390 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
9393 /* Mark that the literal will be moved to the new location. */
9394 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
9396 /* Remove the literal. */
9397 text_action_add (&relax_info
->action_list
,
9398 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
9400 /* If the section is 4-byte aligned, do not add fill. */
9401 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
9403 int fill_extra_space
;
9404 bfd_vma entry_sec_offset
;
9407 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
9409 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
9411 /* If the literal range is at the end of the section,
9413 fill_extra_space
= 0;
9414 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
9416 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9417 fill_extra_space
= the_add_entry
->size
;
9419 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
9420 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
9421 -4, fill_extra_space
);
9423 adjust_fill_action (fa
, removed_diff
);
9425 text_action_add (&relax_info
->action_list
,
9426 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
9433 /* Second relaxation pass. */
9436 action_remove_bytes_fn (splay_tree_node node
, void *p
)
9438 bfd_size_type
*final_size
= p
;
9439 text_action
*action
= (text_action
*)node
->value
;
9441 *final_size
-= action
->removed_bytes
;
9445 /* Modify all of the relocations to point to the right spot, and if this
9446 is a relaxable section, delete the unwanted literals and fix the
9450 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
9452 Elf_Internal_Rela
*internal_relocs
;
9453 xtensa_relax_info
*relax_info
;
9455 bfd_boolean ok
= TRUE
;
9457 bfd_boolean rv
= FALSE
;
9458 bfd_boolean virtual_action
;
9459 bfd_size_type sec_size
;
9461 sec_size
= bfd_get_section_limit (abfd
, sec
);
9462 relax_info
= get_xtensa_relax_info (sec
);
9463 BFD_ASSERT (relax_info
);
9465 /* First translate any of the fixes that have been added already. */
9466 translate_section_fixes (sec
);
9468 /* Handle property sections (e.g., literal tables) specially. */
9469 if (xtensa_is_property_section (sec
))
9471 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
9472 return relax_property_section (abfd
, sec
, link_info
);
9475 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9476 link_info
->keep_memory
);
9477 if (!internal_relocs
&& !action_list_count (&relax_info
->action_list
))
9480 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9481 if (contents
== NULL
&& sec_size
!= 0)
9487 if (internal_relocs
)
9489 for (i
= 0; i
< sec
->reloc_count
; i
++)
9491 Elf_Internal_Rela
*irel
;
9492 xtensa_relax_info
*target_relax_info
;
9493 bfd_vma source_offset
, old_source_offset
;
9496 asection
*target_sec
;
9498 /* Locally change the source address.
9499 Translate the target to the new target address.
9500 If it points to this section and has been removed,
9504 irel
= &internal_relocs
[i
];
9505 source_offset
= irel
->r_offset
;
9506 old_source_offset
= source_offset
;
9508 r_type
= ELF32_R_TYPE (irel
->r_info
);
9509 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
9510 bfd_get_section_limit (abfd
, sec
));
9512 /* If this section could have changed then we may need to
9513 change the relocation's offset. */
9515 if (relax_info
->is_relaxable_literal_section
9516 || relax_info
->is_relaxable_asm_section
)
9518 pin_internal_relocs (sec
, internal_relocs
);
9520 if (r_type
!= R_XTENSA_NONE
9521 && find_removed_literal (&relax_info
->removed_list
,
9524 /* Remove this relocation. */
9525 if (elf_hash_table (link_info
)->dynamic_sections_created
)
9526 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
9527 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9528 irel
->r_offset
= offset_with_removed_text_map
9529 (&relax_info
->action_list
, irel
->r_offset
);
9533 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
9535 text_action
*action
=
9536 find_insn_action (&relax_info
->action_list
,
9538 if (action
&& (action
->action
== ta_convert_longcall
9539 || action
->action
== ta_remove_longcall
))
9541 bfd_reloc_status_type retval
;
9542 char *error_message
= NULL
;
9544 retval
= contract_asm_expansion (contents
, sec_size
,
9545 irel
, &error_message
);
9546 if (retval
!= bfd_reloc_ok
)
9548 (*link_info
->callbacks
->reloc_dangerous
)
9549 (link_info
, error_message
, abfd
, sec
,
9553 /* Update the action so that the code that moves
9554 the contents will do the right thing. */
9555 /* ta_remove_longcall and ta_remove_insn actions are
9556 grouped together in the tree as well as
9557 ta_convert_longcall and ta_none, so that changes below
9558 can be done w/o removing and reinserting action into
9561 if (action
->action
== ta_remove_longcall
)
9562 action
->action
= ta_remove_insn
;
9564 action
->action
= ta_none
;
9565 /* Refresh the info in the r_rel. */
9566 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
9567 r_type
= ELF32_R_TYPE (irel
->r_info
);
9571 source_offset
= offset_with_removed_text_map
9572 (&relax_info
->action_list
, irel
->r_offset
);
9573 irel
->r_offset
= source_offset
;
9576 /* If the target section could have changed then
9577 we may need to change the relocation's target offset. */
9579 target_sec
= r_reloc_get_section (&r_rel
);
9581 /* For a reference to a discarded section from a DWARF section,
9582 i.e., where action_discarded is PRETEND, the symbol will
9583 eventually be modified to refer to the kept section (at least if
9584 the kept and discarded sections are the same size). Anticipate
9585 that here and adjust things accordingly. */
9586 if (! elf_xtensa_ignore_discarded_relocs (sec
)
9587 && elf_xtensa_action_discarded (sec
) == PRETEND
9588 && sec
->sec_info_type
!= SEC_INFO_TYPE_STABS
9589 && target_sec
!= NULL
9590 && discarded_section (target_sec
))
9592 /* It would be natural to call _bfd_elf_check_kept_section
9593 here, but it's not exported from elflink.c. It's also a
9594 fairly expensive check. Adjusting the relocations to the
9595 discarded section is fairly harmless; it will only adjust
9596 some addends and difference values. If it turns out that
9597 _bfd_elf_check_kept_section fails later, it won't matter,
9598 so just compare the section names to find the right group
9600 asection
*kept
= target_sec
->kept_section
;
9603 if ((kept
->flags
& SEC_GROUP
) != 0)
9605 asection
*first
= elf_next_in_group (kept
);
9606 asection
*s
= first
;
9611 if (strcmp (s
->name
, target_sec
->name
) == 0)
9616 s
= elf_next_in_group (s
);
9623 && ((target_sec
->rawsize
!= 0
9624 ? target_sec
->rawsize
: target_sec
->size
)
9625 == (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9629 target_relax_info
= get_xtensa_relax_info (target_sec
);
9630 if (target_relax_info
9631 && (target_relax_info
->is_relaxable_literal_section
9632 || target_relax_info
->is_relaxable_asm_section
))
9635 target_sec
= translate_reloc (&r_rel
, &new_reloc
, target_sec
);
9637 if (r_type
== R_XTENSA_DIFF8
9638 || r_type
== R_XTENSA_DIFF16
9639 || r_type
== R_XTENSA_DIFF32
9640 || r_type
== R_XTENSA_PDIFF8
9641 || r_type
== R_XTENSA_PDIFF16
9642 || r_type
== R_XTENSA_PDIFF32
9643 || r_type
== R_XTENSA_NDIFF8
9644 || r_type
== R_XTENSA_NDIFF16
9645 || r_type
== R_XTENSA_NDIFF32
)
9647 bfd_signed_vma diff_value
= 0;
9648 bfd_vma new_end_offset
, diff_mask
= 0;
9650 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
9652 (*link_info
->callbacks
->reloc_dangerous
)
9653 (link_info
, _("invalid relocation address"),
9654 abfd
, sec
, old_source_offset
);
9660 case R_XTENSA_DIFF8
:
9663 bfd_get_signed_8 (abfd
, &contents
[old_source_offset
]);
9665 case R_XTENSA_DIFF16
:
9668 bfd_get_signed_16 (abfd
, &contents
[old_source_offset
]);
9670 case R_XTENSA_DIFF32
:
9671 diff_mask
= 0x7fffffff;
9673 bfd_get_signed_32 (abfd
, &contents
[old_source_offset
]);
9675 case R_XTENSA_PDIFF8
:
9676 case R_XTENSA_NDIFF8
:
9679 bfd_get_8 (abfd
, &contents
[old_source_offset
]);
9681 case R_XTENSA_PDIFF16
:
9682 case R_XTENSA_NDIFF16
:
9685 bfd_get_16 (abfd
, &contents
[old_source_offset
]);
9687 case R_XTENSA_PDIFF32
:
9688 case R_XTENSA_NDIFF32
:
9689 diff_mask
= 0xffffffff;
9691 bfd_get_32 (abfd
, &contents
[old_source_offset
]);
9695 if (r_type
>= R_XTENSA_NDIFF8
9696 && r_type
<= R_XTENSA_NDIFF32
9698 diff_value
|= ~diff_mask
;
9700 new_end_offset
= offset_with_removed_text_map
9701 (&target_relax_info
->action_list
,
9702 r_rel
.target_offset
+ diff_value
);
9703 diff_value
= new_end_offset
- new_reloc
.target_offset
;
9707 case R_XTENSA_DIFF8
:
9708 bfd_put_signed_8 (abfd
, diff_value
,
9709 &contents
[old_source_offset
]);
9711 case R_XTENSA_DIFF16
:
9712 bfd_put_signed_16 (abfd
, diff_value
,
9713 &contents
[old_source_offset
]);
9715 case R_XTENSA_DIFF32
:
9716 bfd_put_signed_32 (abfd
, diff_value
,
9717 &contents
[old_source_offset
]);
9719 case R_XTENSA_PDIFF8
:
9720 case R_XTENSA_NDIFF8
:
9721 bfd_put_8 (abfd
, diff_value
,
9722 &contents
[old_source_offset
]);
9724 case R_XTENSA_PDIFF16
:
9725 case R_XTENSA_NDIFF16
:
9726 bfd_put_16 (abfd
, diff_value
,
9727 &contents
[old_source_offset
]);
9729 case R_XTENSA_PDIFF32
:
9730 case R_XTENSA_NDIFF32
:
9731 bfd_put_32 (abfd
, diff_value
,
9732 &contents
[old_source_offset
]);
9736 /* Check for overflow. Sign bits must be all zeroes or
9737 all ones. When sign bits are all ones diff_value
9739 if (((diff_value
& ~diff_mask
) != 0
9740 && (diff_value
& ~diff_mask
) != ~diff_mask
)
9741 || (diff_value
&& (bfd_vma
) diff_value
== ~diff_mask
))
9743 (*link_info
->callbacks
->reloc_dangerous
)
9744 (link_info
, _("overflow after relaxation"),
9745 abfd
, sec
, old_source_offset
);
9749 pin_contents (sec
, contents
);
9752 /* If the relocation still references a section in the same
9753 input file, modify the relocation directly instead of
9754 adding a "fix" record. */
9755 if (target_sec
->owner
== abfd
)
9757 unsigned r_symndx
= ELF32_R_SYM (new_reloc
.rela
.r_info
);
9758 irel
->r_info
= ELF32_R_INFO (r_symndx
, r_type
);
9759 irel
->r_addend
= new_reloc
.rela
.r_addend
;
9760 pin_internal_relocs (sec
, internal_relocs
);
9764 bfd_vma addend_displacement
;
9767 addend_displacement
=
9768 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
9769 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
,
9771 addend_displacement
, TRUE
);
9778 if ((relax_info
->is_relaxable_literal_section
9779 || relax_info
->is_relaxable_asm_section
)
9780 && action_list_count (&relax_info
->action_list
))
9782 /* Walk through the planned actions and build up a table
9783 of move, copy and fill records. Use the move, copy and
9784 fill records to perform the actions once. */
9786 bfd_size_type final_size
, copy_size
, orig_insn_size
;
9787 bfd_byte
*scratch
= NULL
;
9788 bfd_byte
*dup_contents
= NULL
;
9789 bfd_size_type orig_size
= sec
->size
;
9790 bfd_vma orig_dot
= 0;
9791 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
9792 orig dot in physical memory. */
9793 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
9794 bfd_vma dup_dot
= 0;
9796 text_action
*action
;
9798 final_size
= sec
->size
;
9800 splay_tree_foreach (relax_info
->action_list
.tree
,
9801 action_remove_bytes_fn
, &final_size
);
9802 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
9803 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
9805 /* The dot is the current fill location. */
9807 print_action_list (stderr
, &relax_info
->action_list
);
9810 for (action
= action_first (&relax_info
->action_list
); action
;
9811 action
= action_next (&relax_info
->action_list
, action
))
9813 virtual_action
= FALSE
;
9814 if (action
->offset
> orig_dot
)
9816 orig_dot
+= orig_dot_copied
;
9817 orig_dot_copied
= 0;
9819 /* Out of the virtual world. */
9822 if (action
->offset
> orig_dot
)
9824 copy_size
= action
->offset
- orig_dot
;
9825 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
9826 orig_dot
+= copy_size
;
9827 dup_dot
+= copy_size
;
9828 BFD_ASSERT (action
->offset
== orig_dot
);
9830 else if (action
->offset
< orig_dot
)
9832 if (action
->action
== ta_fill
9833 && action
->offset
- action
->removed_bytes
== orig_dot
)
9835 /* This is OK because the fill only effects the dup_dot. */
9837 else if (action
->action
== ta_add_literal
)
9839 /* TBD. Might need to handle this. */
9842 if (action
->offset
== orig_dot
)
9844 if (action
->virtual_offset
> orig_dot_vo
)
9846 if (orig_dot_vo
== 0)
9848 /* Need to copy virtual_offset bytes. Probably four. */
9849 copy_size
= action
->virtual_offset
- orig_dot_vo
;
9850 memmove (&dup_contents
[dup_dot
],
9851 &contents
[orig_dot
], copy_size
);
9852 orig_dot_copied
= copy_size
;
9853 dup_dot
+= copy_size
;
9855 virtual_action
= TRUE
;
9858 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
9860 switch (action
->action
)
9862 case ta_remove_literal
:
9863 case ta_remove_insn
:
9864 BFD_ASSERT (action
->removed_bytes
>= 0);
9865 orig_dot
+= action
->removed_bytes
;
9868 case ta_narrow_insn
:
9871 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
9872 BFD_ASSERT (action
->removed_bytes
== 1);
9873 rv
= narrow_instruction (scratch
, final_size
, 0);
9875 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
9876 orig_dot
+= orig_insn_size
;
9877 dup_dot
+= copy_size
;
9881 if (action
->removed_bytes
>= 0)
9882 orig_dot
+= action
->removed_bytes
;
9885 /* Already zeroed in dup_contents. Just bump the
9887 dup_dot
+= (-action
->removed_bytes
);
9892 BFD_ASSERT (action
->removed_bytes
== 0);
9895 case ta_convert_longcall
:
9896 case ta_remove_longcall
:
9897 /* These will be removed or converted before we get here. */
9904 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
9905 BFD_ASSERT (action
->removed_bytes
== -1);
9906 rv
= widen_instruction (scratch
, final_size
, 0);
9908 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
9909 orig_dot
+= orig_insn_size
;
9910 dup_dot
+= copy_size
;
9913 case ta_add_literal
:
9916 BFD_ASSERT (action
->removed_bytes
== -4);
9917 /* TBD -- place the literal value here and insert
9919 memset (&dup_contents
[dup_dot
], 0, 4);
9920 pin_internal_relocs (sec
, internal_relocs
);
9921 pin_contents (sec
, contents
);
9923 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
9924 relax_info
, &internal_relocs
, &action
->value
))
9928 orig_dot_vo
+= copy_size
;
9930 orig_dot
+= orig_insn_size
;
9931 dup_dot
+= copy_size
;
9935 /* Not implemented yet. */
9940 BFD_ASSERT (dup_dot
<= final_size
);
9941 BFD_ASSERT (orig_dot
<= orig_size
);
9944 orig_dot
+= orig_dot_copied
;
9945 orig_dot_copied
= 0;
9947 if (orig_dot
!= orig_size
)
9949 copy_size
= orig_size
- orig_dot
;
9950 BFD_ASSERT (orig_size
> orig_dot
);
9951 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
9952 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
9953 orig_dot
+= copy_size
;
9954 dup_dot
+= copy_size
;
9956 BFD_ASSERT (orig_size
== orig_dot
);
9957 BFD_ASSERT (final_size
== dup_dot
);
9959 /* Move the dup_contents back. */
9960 if (final_size
> orig_size
)
9962 /* Contents need to be reallocated. Swap the dup_contents into
9964 sec
->contents
= dup_contents
;
9966 contents
= dup_contents
;
9967 pin_contents (sec
, contents
);
9971 BFD_ASSERT (final_size
<= orig_size
);
9972 memset (contents
, 0, orig_size
);
9973 memcpy (contents
, dup_contents
, final_size
);
9974 free (dup_contents
);
9977 pin_contents (sec
, contents
);
9979 if (sec
->rawsize
== 0)
9980 sec
->rawsize
= sec
->size
;
9981 sec
->size
= final_size
;
9985 release_internal_relocs (sec
, internal_relocs
);
9986 release_contents (sec
, contents
);
9992 translate_section_fixes (asection
*sec
)
9994 xtensa_relax_info
*relax_info
;
9997 relax_info
= get_xtensa_relax_info (sec
);
10001 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
10002 if (!translate_reloc_bfd_fix (r
))
10009 /* Translate a fix given the mapping in the relax info for the target
10010 section. If it has already been translated, no work is required. */
10013 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
10015 reloc_bfd_fix new_fix
;
10017 xtensa_relax_info
*relax_info
;
10018 removed_literal
*removed
;
10019 bfd_vma new_offset
, target_offset
;
10021 if (fix
->translated
)
10024 sec
= fix
->target_sec
;
10025 target_offset
= fix
->target_offset
;
10027 relax_info
= get_xtensa_relax_info (sec
);
10030 fix
->translated
= TRUE
;
10036 /* The fix does not need to be translated if the section cannot change. */
10037 if (!relax_info
->is_relaxable_literal_section
10038 && !relax_info
->is_relaxable_asm_section
)
10040 fix
->translated
= TRUE
;
10044 /* If the literal has been moved and this relocation was on an
10045 opcode, then the relocation should move to the new literal
10046 location. Otherwise, the relocation should move within the
10050 if (is_operand_relocation (fix
->src_type
))
10052 /* Check if the original relocation is against a literal being
10054 removed
= find_removed_literal (&relax_info
->removed_list
,
10062 /* The fact that there is still a relocation to this literal indicates
10063 that the literal is being coalesced, not simply removed. */
10064 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
10066 /* This was moved to some other address (possibly another section). */
10067 new_sec
= r_reloc_get_section (&removed
->to
);
10068 if (new_sec
!= sec
)
10071 relax_info
= get_xtensa_relax_info (sec
);
10073 (!relax_info
->is_relaxable_literal_section
10074 && !relax_info
->is_relaxable_asm_section
))
10076 target_offset
= removed
->to
.target_offset
;
10077 new_fix
.target_sec
= new_sec
;
10078 new_fix
.target_offset
= target_offset
;
10079 new_fix
.translated
= TRUE
;
10084 target_offset
= removed
->to
.target_offset
;
10085 new_fix
.target_sec
= new_sec
;
10088 /* The target address may have been moved within its section. */
10089 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
10092 new_fix
.target_offset
= new_offset
;
10093 new_fix
.target_offset
= new_offset
;
10094 new_fix
.translated
= TRUE
;
10100 /* Fix up a relocation to take account of removed literals. */
10103 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
, asection
*sec
)
10105 xtensa_relax_info
*relax_info
;
10106 removed_literal
*removed
;
10107 bfd_vma target_offset
, base_offset
;
10109 *new_rel
= *orig_rel
;
10111 if (!r_reloc_is_defined (orig_rel
))
10114 relax_info
= get_xtensa_relax_info (sec
);
10115 BFD_ASSERT (relax_info
&& (relax_info
->is_relaxable_literal_section
10116 || relax_info
->is_relaxable_asm_section
));
10118 target_offset
= orig_rel
->target_offset
;
10121 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
10123 /* Check if the original relocation is against a literal being
10125 removed
= find_removed_literal (&relax_info
->removed_list
,
10128 if (removed
&& removed
->to
.abfd
)
10132 /* The fact that there is still a relocation to this literal indicates
10133 that the literal is being coalesced, not simply removed. */
10134 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
10136 /* This was moved to some other address
10137 (possibly in another section). */
10138 *new_rel
= removed
->to
;
10139 new_sec
= r_reloc_get_section (new_rel
);
10140 if (new_sec
!= sec
)
10143 relax_info
= get_xtensa_relax_info (sec
);
10145 || (!relax_info
->is_relaxable_literal_section
10146 && !relax_info
->is_relaxable_asm_section
))
10149 target_offset
= new_rel
->target_offset
;
10152 /* Find the base offset of the reloc symbol, excluding any addend from the
10153 reloc or from the section contents (for a partial_inplace reloc). Then
10154 find the adjusted values of the offsets due to relaxation. The base
10155 offset is needed to determine the change to the reloc's addend; the reloc
10156 addend should not be adjusted due to relaxations located before the base
10159 base_offset
= r_reloc_get_target_offset (new_rel
) - new_rel
->rela
.r_addend
;
10160 if (base_offset
<= target_offset
)
10162 int base_removed
= removed_by_actions_map (&relax_info
->action_list
,
10163 base_offset
, FALSE
);
10164 int addend_removed
= removed_by_actions_map (&relax_info
->action_list
,
10165 target_offset
, FALSE
) -
10168 new_rel
->target_offset
= target_offset
- base_removed
- addend_removed
;
10169 new_rel
->rela
.r_addend
-= addend_removed
;
10173 /* Handle a negative addend. The base offset comes first. */
10174 int tgt_removed
= removed_by_actions_map (&relax_info
->action_list
,
10175 target_offset
, FALSE
);
10176 int addend_removed
= removed_by_actions_map (&relax_info
->action_list
,
10177 base_offset
, FALSE
) -
10180 new_rel
->target_offset
= target_offset
- tgt_removed
;
10181 new_rel
->rela
.r_addend
+= addend_removed
;
10188 /* For dynamic links, there may be a dynamic relocation for each
10189 literal. The number of dynamic relocations must be computed in
10190 size_dynamic_sections, which occurs before relaxation. When a
10191 literal is removed, this function checks if there is a corresponding
10192 dynamic relocation and shrinks the size of the appropriate dynamic
10193 relocation section accordingly. At this point, the contents of the
10194 dynamic relocation sections have not yet been filled in, so there's
10195 nothing else that needs to be done. */
10198 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
10200 asection
*input_section
,
10201 Elf_Internal_Rela
*rel
)
10203 struct elf_xtensa_link_hash_table
*htab
;
10204 Elf_Internal_Shdr
*symtab_hdr
;
10205 struct elf_link_hash_entry
**sym_hashes
;
10206 unsigned long r_symndx
;
10208 struct elf_link_hash_entry
*h
;
10209 bfd_boolean dynamic_symbol
;
10211 htab
= elf_xtensa_hash_table (info
);
10215 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10216 sym_hashes
= elf_sym_hashes (abfd
);
10218 r_type
= ELF32_R_TYPE (rel
->r_info
);
10219 r_symndx
= ELF32_R_SYM (rel
->r_info
);
10221 if (r_symndx
< symtab_hdr
->sh_info
)
10224 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
10226 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
10228 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
10229 && (input_section
->flags
& SEC_ALLOC
) != 0
10231 || (bfd_link_pic (info
)
10232 && (!h
|| h
->root
.type
!= bfd_link_hash_undefweak
))))
10235 bfd_boolean is_plt
= FALSE
;
10237 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
10239 srel
= htab
->elf
.srelplt
;
10243 srel
= htab
->elf
.srelgot
;
10245 /* Reduce size of the .rela.* section by one reloc. */
10246 BFD_ASSERT (srel
!= NULL
);
10247 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
10248 srel
->size
-= sizeof (Elf32_External_Rela
);
10252 asection
*splt
, *sgotplt
, *srelgot
;
10253 int reloc_index
, chunk
;
10255 /* Find the PLT reloc index of the entry being removed. This
10256 is computed from the size of ".rela.plt". It is needed to
10257 figure out which PLT chunk to resize. Usually "last index
10258 = size - 1" since the index starts at zero, but in this
10259 context, the size has just been decremented so there's no
10260 need to subtract one. */
10261 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
10263 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
10264 splt
= elf_xtensa_get_plt_section (info
, chunk
);
10265 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
10266 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
10268 /* Check if an entire PLT chunk has just been eliminated. */
10269 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
10271 /* The two magic GOT entries for that chunk can go away. */
10272 srelgot
= htab
->elf
.srelgot
;
10273 BFD_ASSERT (srelgot
!= NULL
);
10274 srelgot
->reloc_count
-= 2;
10275 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
10276 sgotplt
->size
-= 8;
10278 /* There should be only one entry left (and it will be
10280 BFD_ASSERT (sgotplt
->size
== 4);
10281 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
10284 BFD_ASSERT (sgotplt
->size
>= 4);
10285 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
10287 sgotplt
->size
-= 4;
10288 splt
->size
-= PLT_ENTRY_SIZE
;
10294 /* Take an r_rel and move it to another section. This usually
10295 requires extending the interal_relocation array and pinning it. If
10296 the original r_rel is from the same BFD, we can complete this here.
10297 Otherwise, we add a fix record to let the final link fix the
10298 appropriate address. Contents and internal relocations for the
10299 section must be pinned after calling this routine. */
10302 move_literal (bfd
*abfd
,
10303 struct bfd_link_info
*link_info
,
10306 bfd_byte
*contents
,
10307 xtensa_relax_info
*relax_info
,
10308 Elf_Internal_Rela
**internal_relocs_p
,
10309 const literal_value
*lit
)
10311 Elf_Internal_Rela
*new_relocs
= NULL
;
10312 size_t new_relocs_count
= 0;
10313 Elf_Internal_Rela this_rela
;
10314 const r_reloc
*r_rel
;
10316 r_rel
= &lit
->r_rel
;
10317 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
10319 if (r_reloc_is_const (r_rel
))
10320 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
10325 reloc_bfd_fix
*fix
;
10326 unsigned insert_at
;
10328 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
10330 /* This is the difficult case. We have to create a fix up. */
10331 this_rela
.r_offset
= offset
;
10332 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
10333 this_rela
.r_addend
=
10334 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
10335 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
10337 /* Currently, we cannot move relocations during a relocatable link. */
10338 BFD_ASSERT (!bfd_link_relocatable (link_info
));
10339 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
,
10340 r_reloc_get_section (r_rel
),
10341 r_rel
->target_offset
+ r_rel
->virtual_offset
,
10343 /* We also need to mark that relocations are needed here. */
10344 sec
->flags
|= SEC_RELOC
;
10346 translate_reloc_bfd_fix (fix
);
10347 /* This fix has not yet been translated. */
10348 add_fix (sec
, fix
);
10350 /* Add the relocation. If we have already allocated our own
10351 space for the relocations and we have room for more, then use
10352 it. Otherwise, allocate new space and move the literals. */
10353 insert_at
= sec
->reloc_count
;
10354 for (i
= 0; i
< sec
->reloc_count
; ++i
)
10356 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
10363 if (*internal_relocs_p
!= relax_info
->allocated_relocs
10364 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
10366 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
10367 || sec
->reloc_count
== relax_info
->relocs_count
);
10369 if (relax_info
->allocated_relocs_count
== 0)
10370 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
10372 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
10374 new_relocs
= (Elf_Internal_Rela
*)
10375 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
10379 /* We could handle this more quickly by finding the split point. */
10380 if (insert_at
!= 0)
10381 memcpy (new_relocs
, *internal_relocs_p
,
10382 insert_at
* sizeof (Elf_Internal_Rela
));
10384 new_relocs
[insert_at
] = this_rela
;
10386 if (insert_at
!= sec
->reloc_count
)
10387 memcpy (new_relocs
+ insert_at
+ 1,
10388 (*internal_relocs_p
) + insert_at
,
10389 (sec
->reloc_count
- insert_at
)
10390 * sizeof (Elf_Internal_Rela
));
10392 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
10394 /* The first time we re-allocate, we can only free the
10395 old relocs if they were allocated with bfd_malloc.
10396 This is not true when keep_memory is in effect. */
10397 if (!link_info
->keep_memory
)
10398 free (*internal_relocs_p
);
10401 free (*internal_relocs_p
);
10402 relax_info
->allocated_relocs
= new_relocs
;
10403 relax_info
->allocated_relocs_count
= new_relocs_count
;
10404 elf_section_data (sec
)->relocs
= new_relocs
;
10405 sec
->reloc_count
++;
10406 relax_info
->relocs_count
= sec
->reloc_count
;
10407 *internal_relocs_p
= new_relocs
;
10411 if (insert_at
!= sec
->reloc_count
)
10414 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
10415 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
10417 (*internal_relocs_p
)[insert_at
] = this_rela
;
10418 sec
->reloc_count
++;
10419 if (relax_info
->allocated_relocs
)
10420 relax_info
->relocs_count
= sec
->reloc_count
;
10427 /* This is similar to relax_section except that when a target is moved,
10428 we shift addresses up. We also need to modify the size. This
10429 algorithm does NOT allow for relocations into the middle of the
10430 property sections. */
10433 relax_property_section (bfd
*abfd
,
10435 struct bfd_link_info
*link_info
)
10437 Elf_Internal_Rela
*internal_relocs
;
10438 bfd_byte
*contents
;
10440 bfd_boolean ok
= TRUE
;
10441 bfd_boolean is_full_prop_section
;
10442 size_t last_zfill_target_offset
= 0;
10443 asection
*last_zfill_target_sec
= NULL
;
10444 bfd_size_type sec_size
;
10445 bfd_size_type entry_size
;
10447 sec_size
= bfd_get_section_limit (abfd
, sec
);
10448 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
10449 link_info
->keep_memory
);
10450 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
10451 if (contents
== NULL
&& sec_size
!= 0)
10457 is_full_prop_section
= xtensa_is_proptable_section (sec
);
10458 if (is_full_prop_section
)
10463 if (internal_relocs
)
10465 for (i
= 0; i
< sec
->reloc_count
; i
++)
10467 Elf_Internal_Rela
*irel
;
10468 xtensa_relax_info
*target_relax_info
;
10470 asection
*target_sec
;
10472 bfd_byte
*size_p
, *flags_p
;
10474 /* Locally change the source address.
10475 Translate the target to the new target address.
10476 If it points to this section and has been removed, MOVE IT.
10477 Also, don't forget to modify the associated SIZE at
10480 irel
= &internal_relocs
[i
];
10481 r_type
= ELF32_R_TYPE (irel
->r_info
);
10482 if (r_type
== R_XTENSA_NONE
)
10485 /* Find the literal value. */
10486 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
10487 size_p
= &contents
[irel
->r_offset
+ 4];
10489 if (is_full_prop_section
)
10490 flags_p
= &contents
[irel
->r_offset
+ 8];
10491 BFD_ASSERT (irel
->r_offset
+ entry_size
<= sec_size
);
10493 target_sec
= r_reloc_get_section (&val
.r_rel
);
10494 target_relax_info
= get_xtensa_relax_info (target_sec
);
10496 if (target_relax_info
10497 && (target_relax_info
->is_relaxable_literal_section
10498 || target_relax_info
->is_relaxable_asm_section
))
10500 /* Translate the relocation's destination. */
10501 bfd_vma old_offset
= val
.r_rel
.target_offset
;
10502 bfd_vma new_offset
;
10503 long old_size
, new_size
;
10504 int removed_by_old_offset
=
10505 removed_by_actions_map (&target_relax_info
->action_list
,
10506 old_offset
, FALSE
);
10507 new_offset
= old_offset
- removed_by_old_offset
;
10509 /* Assert that we are not out of bounds. */
10510 old_size
= bfd_get_32 (abfd
, size_p
);
10511 new_size
= old_size
;
10515 /* Only the first zero-sized unreachable entry is
10516 allowed to expand. In this case the new offset
10517 should be the offset before the fill and the new
10518 size is the expansion size. For other zero-sized
10519 entries the resulting size should be zero with an
10520 offset before or after the fill address depending
10521 on whether the expanding unreachable entry
10523 if (last_zfill_target_sec
== 0
10524 || last_zfill_target_sec
!= target_sec
10525 || last_zfill_target_offset
!= old_offset
)
10527 bfd_vma new_end_offset
= new_offset
;
10529 /* Recompute the new_offset, but this time don't
10530 include any fill inserted by relaxation. */
10531 removed_by_old_offset
=
10532 removed_by_actions_map (&target_relax_info
->action_list
,
10534 new_offset
= old_offset
- removed_by_old_offset
;
10536 /* If it is not unreachable and we have not yet
10537 seen an unreachable at this address, place it
10538 before the fill address. */
10539 if (flags_p
&& (bfd_get_32 (abfd
, flags_p
)
10540 & XTENSA_PROP_UNREACHABLE
) != 0)
10542 new_size
= new_end_offset
- new_offset
;
10544 last_zfill_target_sec
= target_sec
;
10545 last_zfill_target_offset
= old_offset
;
10551 int removed_by_old_offset_size
=
10552 removed_by_actions_map (&target_relax_info
->action_list
,
10553 old_offset
+ old_size
, TRUE
);
10554 new_size
-= removed_by_old_offset_size
- removed_by_old_offset
;
10557 if (new_size
!= old_size
)
10559 bfd_put_32 (abfd
, new_size
, size_p
);
10560 pin_contents (sec
, contents
);
10563 if (new_offset
!= old_offset
)
10565 bfd_vma diff
= new_offset
- old_offset
;
10566 irel
->r_addend
+= diff
;
10567 pin_internal_relocs (sec
, internal_relocs
);
10573 /* Combine adjacent property table entries. This is also done in
10574 finish_dynamic_sections() but at that point it's too late to
10575 reclaim the space in the output section, so we do this twice. */
10577 if (internal_relocs
&& (!bfd_link_relocatable (link_info
)
10578 || xtensa_is_littable_section (sec
)))
10580 Elf_Internal_Rela
*last_irel
= NULL
;
10581 Elf_Internal_Rela
*irel
, *next_rel
, *rel_end
;
10582 int removed_bytes
= 0;
10584 flagword predef_flags
;
10586 predef_flags
= xtensa_get_property_predef_flags (sec
);
10588 /* Walk over memory and relocations at the same time.
10589 This REQUIRES that the internal_relocs be sorted by offset. */
10590 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
10591 internal_reloc_compare
);
10593 pin_internal_relocs (sec
, internal_relocs
);
10594 pin_contents (sec
, contents
);
10596 next_rel
= internal_relocs
;
10597 rel_end
= internal_relocs
+ sec
->reloc_count
;
10599 BFD_ASSERT (sec
->size
% entry_size
== 0);
10601 for (offset
= 0; offset
< sec
->size
; offset
+= entry_size
)
10603 Elf_Internal_Rela
*offset_rel
, *extra_rel
;
10604 bfd_vma bytes_to_remove
, size
, actual_offset
;
10605 bfd_boolean remove_this_rel
;
10608 /* Find the first relocation for the entry at the current offset.
10609 Adjust the offsets of any extra relocations for the previous
10614 for (irel
= next_rel
; irel
< rel_end
; irel
++)
10616 if ((irel
->r_offset
== offset
10617 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
10618 || irel
->r_offset
> offset
)
10623 irel
->r_offset
-= removed_bytes
;
10627 /* Find the next relocation (if there are any left). */
10631 for (irel
= offset_rel
+ 1; irel
< rel_end
; irel
++)
10633 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
10641 /* Check if there are relocations on the current entry. There
10642 should usually be a relocation on the offset field. If there
10643 are relocations on the size or flags, then we can't optimize
10644 this entry. Also, find the next relocation to examine on the
10648 if (offset_rel
->r_offset
>= offset
+ entry_size
)
10650 next_rel
= offset_rel
;
10651 /* There are no relocations on the current entry, but we
10652 might still be able to remove it if the size is zero. */
10655 else if (offset_rel
->r_offset
> offset
10657 && extra_rel
->r_offset
< offset
+ entry_size
))
10659 /* There is a relocation on the size or flags, so we can't
10660 do anything with this entry. Continue with the next. */
10661 next_rel
= offset_rel
;
10666 BFD_ASSERT (offset_rel
->r_offset
== offset
);
10667 offset_rel
->r_offset
-= removed_bytes
;
10668 next_rel
= offset_rel
+ 1;
10674 remove_this_rel
= FALSE
;
10675 bytes_to_remove
= 0;
10676 actual_offset
= offset
- removed_bytes
;
10677 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
10679 if (is_full_prop_section
)
10680 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
10682 flags
= predef_flags
;
10685 && (flags
& XTENSA_PROP_ALIGN
) == 0
10686 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
10688 /* Always remove entries with zero size and no alignment. */
10689 bytes_to_remove
= entry_size
;
10691 remove_this_rel
= TRUE
;
10693 else if (offset_rel
10694 && ELF32_R_TYPE (offset_rel
->r_info
) == R_XTENSA_32
)
10698 flagword old_flags
;
10700 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
10701 bfd_vma old_address
=
10702 (last_irel
->r_addend
10703 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
10704 bfd_vma new_address
=
10705 (offset_rel
->r_addend
10706 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
10707 if (is_full_prop_section
)
10708 old_flags
= bfd_get_32
10709 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
10711 old_flags
= predef_flags
;
10713 if ((ELF32_R_SYM (offset_rel
->r_info
)
10714 == ELF32_R_SYM (last_irel
->r_info
))
10715 && old_address
+ old_size
== new_address
10716 && old_flags
== flags
10717 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
10718 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
10720 /* Fix the old size. */
10721 bfd_put_32 (abfd
, old_size
+ size
,
10722 &contents
[last_irel
->r_offset
+ 4]);
10723 bytes_to_remove
= entry_size
;
10724 remove_this_rel
= TRUE
;
10727 last_irel
= offset_rel
;
10730 last_irel
= offset_rel
;
10733 if (remove_this_rel
)
10735 offset_rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
10736 offset_rel
->r_offset
= 0;
10739 if (bytes_to_remove
!= 0)
10741 removed_bytes
+= bytes_to_remove
;
10742 if (offset
+ bytes_to_remove
< sec
->size
)
10743 memmove (&contents
[actual_offset
],
10744 &contents
[actual_offset
+ bytes_to_remove
],
10745 sec
->size
- offset
- bytes_to_remove
);
10751 /* Fix up any extra relocations on the last entry. */
10752 for (irel
= next_rel
; irel
< rel_end
; irel
++)
10753 irel
->r_offset
-= removed_bytes
;
10755 /* Clear the removed bytes. */
10756 memset (&contents
[sec
->size
- removed_bytes
], 0, removed_bytes
);
10758 if (sec
->rawsize
== 0)
10759 sec
->rawsize
= sec
->size
;
10760 sec
->size
-= removed_bytes
;
10762 if (xtensa_is_littable_section (sec
))
10764 asection
*sgotloc
= elf_xtensa_hash_table (link_info
)->sgotloc
;
10766 sgotloc
->size
-= removed_bytes
;
10772 release_internal_relocs (sec
, internal_relocs
);
10773 release_contents (sec
, contents
);
10778 /* Third relaxation pass. */
10780 /* Change symbol values to account for removed literals. */
10783 relax_section_symbols (bfd
*abfd
, asection
*sec
)
10785 xtensa_relax_info
*relax_info
;
10786 unsigned int sec_shndx
;
10787 Elf_Internal_Shdr
*symtab_hdr
;
10788 Elf_Internal_Sym
*isymbuf
;
10789 unsigned i
, num_syms
, num_locals
;
10791 relax_info
= get_xtensa_relax_info (sec
);
10792 BFD_ASSERT (relax_info
);
10794 if (!relax_info
->is_relaxable_literal_section
10795 && !relax_info
->is_relaxable_asm_section
)
10798 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
10800 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10801 isymbuf
= retrieve_local_syms (abfd
);
10803 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
10804 num_locals
= symtab_hdr
->sh_info
;
10806 /* Adjust the local symbols defined in this section. */
10807 for (i
= 0; i
< num_locals
; i
++)
10809 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
10811 if (isym
->st_shndx
== sec_shndx
)
10813 bfd_vma orig_addr
= isym
->st_value
;
10814 int removed
= removed_by_actions_map (&relax_info
->action_list
,
10817 isym
->st_value
-= removed
;
10818 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
10820 removed_by_actions_map (&relax_info
->action_list
,
10821 orig_addr
+ isym
->st_size
, FALSE
) -
10826 /* Now adjust the global symbols defined in this section. */
10827 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
10829 struct elf_link_hash_entry
*sym_hash
;
10831 sym_hash
= elf_sym_hashes (abfd
)[i
];
10833 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
10834 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
10836 if ((sym_hash
->root
.type
== bfd_link_hash_defined
10837 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
10838 && sym_hash
->root
.u
.def
.section
== sec
)
10840 bfd_vma orig_addr
= sym_hash
->root
.u
.def
.value
;
10841 int removed
= removed_by_actions_map (&relax_info
->action_list
,
10844 sym_hash
->root
.u
.def
.value
-= removed
;
10846 if (sym_hash
->type
== STT_FUNC
)
10848 removed_by_actions_map (&relax_info
->action_list
,
10849 orig_addr
+ sym_hash
->size
, FALSE
) -
10858 /* "Fix" handling functions, called while performing relocations. */
10861 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
10863 asection
*input_section
,
10864 bfd_byte
*contents
)
10867 asection
*sec
, *old_sec
;
10868 bfd_vma old_offset
;
10869 int r_type
= ELF32_R_TYPE (rel
->r_info
);
10870 reloc_bfd_fix
*fix
;
10872 if (r_type
== R_XTENSA_NONE
)
10875 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
10879 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
10880 bfd_get_section_limit (input_bfd
, input_section
));
10881 old_sec
= r_reloc_get_section (&r_rel
);
10882 old_offset
= r_rel
.target_offset
;
10884 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
10886 if (r_type
!= R_XTENSA_ASM_EXPAND
)
10889 /* xgettext:c-format */
10890 (_("%pB(%pA+%#" PRIx64
"): unexpected fix for %s relocation"),
10891 input_bfd
, input_section
, (uint64_t) rel
->r_offset
,
10892 elf_howto_table
[r_type
].name
);
10895 /* Leave it be. Resolution will happen in a later stage. */
10899 sec
= fix
->target_sec
;
10900 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
10901 - (old_sec
->output_offset
+ old_offset
));
10908 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
10910 asection
*input_section
,
10911 bfd_byte
*contents
,
10912 bfd_vma
*relocationp
)
10915 int r_type
= ELF32_R_TYPE (rel
->r_info
);
10916 reloc_bfd_fix
*fix
;
10917 bfd_vma fixup_diff
;
10919 if (r_type
== R_XTENSA_NONE
)
10922 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
10926 sec
= fix
->target_sec
;
10928 fixup_diff
= rel
->r_addend
;
10929 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
10931 bfd_vma inplace_val
;
10932 BFD_ASSERT (fix
->src_offset
10933 < bfd_get_section_limit (input_bfd
, input_section
));
10934 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
10935 fixup_diff
+= inplace_val
;
10938 *relocationp
= (sec
->output_section
->vma
10939 + sec
->output_offset
10940 + fix
->target_offset
- fixup_diff
);
10944 /* Miscellaneous utility functions.... */
10947 elf_xtensa_get_plt_section (struct bfd_link_info
*info
, int chunk
)
10953 return elf_hash_table (info
)->splt
;
10955 dynobj
= elf_hash_table (info
)->dynobj
;
10956 sprintf (plt_name
, ".plt.%u", chunk
);
10957 return bfd_get_linker_section (dynobj
, plt_name
);
10962 elf_xtensa_get_gotplt_section (struct bfd_link_info
*info
, int chunk
)
10968 return elf_hash_table (info
)->sgotplt
;
10970 dynobj
= elf_hash_table (info
)->dynobj
;
10971 sprintf (got_name
, ".got.plt.%u", chunk
);
10972 return bfd_get_linker_section (dynobj
, got_name
);
10976 /* Get the input section for a given symbol index.
10978 . a section symbol, return the section;
10979 . a common symbol, return the common section;
10980 . an undefined symbol, return the undefined section;
10981 . an indirect symbol, follow the links;
10982 . an absolute value, return the absolute section. */
10985 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
10987 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10988 asection
*target_sec
= NULL
;
10989 if (r_symndx
< symtab_hdr
->sh_info
)
10991 Elf_Internal_Sym
*isymbuf
;
10992 unsigned int section_index
;
10994 isymbuf
= retrieve_local_syms (abfd
);
10995 section_index
= isymbuf
[r_symndx
].st_shndx
;
10997 if (section_index
== SHN_UNDEF
)
10998 target_sec
= bfd_und_section_ptr
;
10999 else if (section_index
== SHN_ABS
)
11000 target_sec
= bfd_abs_section_ptr
;
11001 else if (section_index
== SHN_COMMON
)
11002 target_sec
= bfd_com_section_ptr
;
11004 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
11008 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
11009 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
11011 while (h
->root
.type
== bfd_link_hash_indirect
11012 || h
->root
.type
== bfd_link_hash_warning
)
11013 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11015 switch (h
->root
.type
)
11017 case bfd_link_hash_defined
:
11018 case bfd_link_hash_defweak
:
11019 target_sec
= h
->root
.u
.def
.section
;
11021 case bfd_link_hash_common
:
11022 target_sec
= bfd_com_section_ptr
;
11024 case bfd_link_hash_undefined
:
11025 case bfd_link_hash_undefweak
:
11026 target_sec
= bfd_und_section_ptr
;
11028 default: /* New indirect warning. */
11029 target_sec
= bfd_und_section_ptr
;
11037 static struct elf_link_hash_entry
*
11038 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
11040 unsigned long indx
;
11041 struct elf_link_hash_entry
*h
;
11042 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11044 if (r_symndx
< symtab_hdr
->sh_info
)
11047 indx
= r_symndx
- symtab_hdr
->sh_info
;
11048 h
= elf_sym_hashes (abfd
)[indx
];
11049 while (h
->root
.type
== bfd_link_hash_indirect
11050 || h
->root
.type
== bfd_link_hash_warning
)
11051 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11056 /* Get the section-relative offset for a symbol number. */
11059 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
11061 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11062 bfd_vma offset
= 0;
11064 if (r_symndx
< symtab_hdr
->sh_info
)
11066 Elf_Internal_Sym
*isymbuf
;
11067 isymbuf
= retrieve_local_syms (abfd
);
11068 offset
= isymbuf
[r_symndx
].st_value
;
11072 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
11073 struct elf_link_hash_entry
*h
=
11074 elf_sym_hashes (abfd
)[indx
];
11076 while (h
->root
.type
== bfd_link_hash_indirect
11077 || h
->root
.type
== bfd_link_hash_warning
)
11078 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11079 if (h
->root
.type
== bfd_link_hash_defined
11080 || h
->root
.type
== bfd_link_hash_defweak
)
11081 offset
= h
->root
.u
.def
.value
;
11088 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
11090 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
11091 struct elf_link_hash_entry
*h
;
11093 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
11094 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
11101 pcrel_reloc_fits (xtensa_opcode opc
,
11103 bfd_vma self_address
,
11104 bfd_vma dest_address
)
11106 xtensa_isa isa
= xtensa_default_isa
;
11107 uint32 valp
= dest_address
;
11108 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
11109 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
11116 xtensa_is_property_section (asection
*sec
)
11118 if (xtensa_is_insntable_section (sec
)
11119 || xtensa_is_littable_section (sec
)
11120 || xtensa_is_proptable_section (sec
))
11128 xtensa_is_insntable_section (asection
*sec
)
11130 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
11131 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
11139 xtensa_is_littable_section (asection
*sec
)
11141 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
11142 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.p."))
11150 xtensa_is_proptable_section (asection
*sec
)
11152 if (CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
11153 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."))
11161 internal_reloc_compare (const void *ap
, const void *bp
)
11163 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
11164 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
11166 if (a
->r_offset
!= b
->r_offset
)
11167 return (a
->r_offset
- b
->r_offset
);
11169 /* We don't need to sort on these criteria for correctness,
11170 but enforcing a more strict ordering prevents unstable qsort
11171 from behaving differently with different implementations.
11172 Without the code below we get correct but different results
11173 on Solaris 2.7 and 2.8. We would like to always produce the
11174 same results no matter the host. */
11176 if (a
->r_info
!= b
->r_info
)
11177 return (a
->r_info
- b
->r_info
);
11179 return (a
->r_addend
- b
->r_addend
);
11184 internal_reloc_matches (const void *ap
, const void *bp
)
11186 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
11187 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
11189 /* Check if one entry overlaps with the other; this shouldn't happen
11190 except when searching for a match. */
11191 return (a
->r_offset
- b
->r_offset
);
11195 /* Predicate function used to look up a section in a particular group. */
11198 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
11200 const char *gname
= inf
;
11201 const char *group_name
= elf_group_name (sec
);
11203 return (group_name
== gname
11204 || (group_name
!= NULL
11206 && strcmp (group_name
, gname
) == 0));
11211 xtensa_add_names (const char *base
, const char *suffix
)
11215 size_t base_len
= strlen (base
);
11216 size_t suffix_len
= strlen (suffix
);
11217 char *str
= bfd_malloc (base_len
+ suffix_len
+ 1);
11219 memcpy (str
, base
, base_len
);
11220 memcpy (str
+ base_len
, suffix
, suffix_len
+ 1);
11225 return strdup (base
);
11229 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
11232 xtensa_property_section_name (asection
*sec
, const char *base_name
,
11233 bfd_boolean separate_sections
)
11235 const char *suffix
, *group_name
;
11236 char *prop_sec_name
;
11238 group_name
= elf_group_name (sec
);
11241 suffix
= strrchr (sec
->name
, '.');
11242 if (suffix
== sec
->name
)
11244 prop_sec_name
= xtensa_add_names (base_name
, suffix
);
11246 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
11248 char *linkonce_kind
= 0;
11250 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
11251 linkonce_kind
= "x.";
11252 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
11253 linkonce_kind
= "p.";
11254 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
11255 linkonce_kind
= "prop.";
11259 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
11260 + strlen (linkonce_kind
) + 1);
11261 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
11262 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
11264 suffix
= sec
->name
+ linkonce_len
;
11265 /* For backward compatibility, replace "t." instead of inserting
11266 the new linkonce_kind (but not for "prop" sections). */
11267 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
11269 strcat (prop_sec_name
+ linkonce_len
, suffix
);
11273 prop_sec_name
= xtensa_add_names (base_name
,
11274 separate_sections
? sec
->name
: NULL
);
11277 return prop_sec_name
;
11282 xtensa_get_separate_property_section (asection
*sec
, const char *base_name
,
11283 bfd_boolean separate_section
)
11285 char *prop_sec_name
;
11286 asection
*prop_sec
;
11288 prop_sec_name
= xtensa_property_section_name (sec
, base_name
,
11290 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
11291 match_section_group
,
11292 (void *) elf_group_name (sec
));
11293 free (prop_sec_name
);
11298 xtensa_get_property_section (asection
*sec
, const char *base_name
)
11300 asection
*prop_sec
;
11302 /* Try individual property section first. */
11303 prop_sec
= xtensa_get_separate_property_section (sec
, base_name
, TRUE
);
11305 /* Refer to a common property section if individual is not present. */
11307 prop_sec
= xtensa_get_separate_property_section (sec
, base_name
, FALSE
);
11314 xtensa_make_property_section (asection
*sec
, const char *base_name
)
11316 char *prop_sec_name
;
11317 asection
*prop_sec
;
11319 /* Check if the section already exists. */
11320 prop_sec_name
= xtensa_property_section_name (sec
, base_name
,
11321 elf32xtensa_separate_props
);
11322 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
11323 match_section_group
,
11324 (void *) elf_group_name (sec
));
11325 /* If not, create it. */
11328 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
11329 flags
|= (bfd_section_flags (sec
)
11330 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
11332 prop_sec
= bfd_make_section_anyway_with_flags
11333 (sec
->owner
, strdup (prop_sec_name
), flags
);
11337 elf_group_name (prop_sec
) = elf_group_name (sec
);
11340 free (prop_sec_name
);
11346 xtensa_get_property_predef_flags (asection
*sec
)
11348 if (xtensa_is_insntable_section (sec
))
11349 return (XTENSA_PROP_INSN
11350 | XTENSA_PROP_NO_TRANSFORM
11351 | XTENSA_PROP_INSN_NO_REORDER
);
11353 if (xtensa_is_littable_section (sec
))
11354 return (XTENSA_PROP_LITERAL
11355 | XTENSA_PROP_NO_TRANSFORM
11356 | XTENSA_PROP_INSN_NO_REORDER
);
11362 /* Other functions called directly by the linker. */
11365 xtensa_callback_required_dependence (bfd
*abfd
,
11367 struct bfd_link_info
*link_info
,
11368 deps_callback_t callback
,
11371 Elf_Internal_Rela
*internal_relocs
;
11372 bfd_byte
*contents
;
11374 bfd_boolean ok
= TRUE
;
11375 bfd_size_type sec_size
;
11377 sec_size
= bfd_get_section_limit (abfd
, sec
);
11379 /* ".plt*" sections have no explicit relocations but they contain L32R
11380 instructions that reference the corresponding ".got.plt*" sections. */
11381 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
11382 && CONST_STRNEQ (sec
->name
, ".plt"))
11386 /* Find the corresponding ".got.plt*" section. */
11387 if (sec
->name
[4] == '\0')
11388 sgotplt
= elf_hash_table (link_info
)->sgotplt
;
11394 BFD_ASSERT (sec
->name
[4] == '.');
11395 chunk
= strtol (&sec
->name
[5], NULL
, 10);
11397 sprintf (got_name
, ".got.plt.%u", chunk
);
11398 sgotplt
= bfd_get_linker_section (sec
->owner
, got_name
);
11400 BFD_ASSERT (sgotplt
);
11402 /* Assume worst-case offsets: L32R at the very end of the ".plt"
11403 section referencing a literal at the very beginning of
11404 ".got.plt". This is very close to the real dependence, anyway. */
11405 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
11408 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
11409 when building uclibc, which runs "ld -b binary /dev/null". */
11410 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
11413 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
11414 link_info
->keep_memory
);
11415 if (internal_relocs
== NULL
11416 || sec
->reloc_count
== 0)
11419 /* Cache the contents for the duration of this scan. */
11420 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
11421 if (contents
== NULL
&& sec_size
!= 0)
11427 if (!xtensa_default_isa
)
11428 xtensa_default_isa
= xtensa_isa_init (0, 0);
11430 for (i
= 0; i
< sec
->reloc_count
; i
++)
11432 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
11433 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
11436 asection
*target_sec
;
11437 bfd_vma target_offset
;
11439 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
11442 /* L32Rs must be local to the input file. */
11443 if (r_reloc_is_defined (&l32r_rel
))
11445 target_sec
= r_reloc_get_section (&l32r_rel
);
11446 target_offset
= l32r_rel
.target_offset
;
11448 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
11454 release_internal_relocs (sec
, internal_relocs
);
11455 release_contents (sec
, contents
);
11459 /* The default literal sections should always be marked as "code" (i.e.,
11460 SHF_EXECINSTR). This is particularly important for the Linux kernel
11461 module loader so that the literals are not placed after the text. */
11462 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
11464 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11465 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11466 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11467 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE
, 0 },
11468 { NULL
, 0, 0, 0, 0 }
11471 #define ELF_TARGET_ID XTENSA_ELF_DATA
11473 #define TARGET_LITTLE_SYM xtensa_elf32_le_vec
11474 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
11475 #define TARGET_BIG_SYM xtensa_elf32_be_vec
11476 #define TARGET_BIG_NAME "elf32-xtensa-be"
11477 #define ELF_ARCH bfd_arch_xtensa
11479 #define ELF_MACHINE_CODE EM_XTENSA
11480 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
11482 #define ELF_MAXPAGESIZE 0x1000
11483 #endif /* ELF_ARCH */
11485 #define elf_backend_can_gc_sections 1
11486 #define elf_backend_can_refcount 1
11487 #define elf_backend_plt_readonly 1
11488 #define elf_backend_got_header_size 4
11489 #define elf_backend_want_dynbss 0
11490 #define elf_backend_want_got_plt 1
11491 #define elf_backend_dtrel_excludes_plt 1
11493 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
11495 #define bfd_elf32_mkobject elf_xtensa_mkobject
11497 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
11498 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
11499 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
11500 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
11501 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
11502 #define bfd_elf32_bfd_reloc_name_lookup \
11503 elf_xtensa_reloc_name_lookup
11504 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
11505 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
11507 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
11508 #define elf_backend_check_relocs elf_xtensa_check_relocs
11509 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
11510 #define elf_backend_discard_info elf_xtensa_discard_info
11511 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
11512 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
11513 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
11514 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
11515 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
11516 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
11517 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
11518 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
11519 #define elf_backend_object_p elf_xtensa_object_p
11520 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
11521 #define elf_backend_relocate_section elf_xtensa_relocate_section
11522 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
11523 #define elf_backend_always_size_sections elf_xtensa_always_size_sections
11524 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all
11525 #define elf_backend_special_sections elf_xtensa_special_sections
11526 #define elf_backend_action_discarded elf_xtensa_action_discarded
11527 #define elf_backend_copy_indirect_symbol elf_xtensa_copy_indirect_symbol
11529 #include "elf32-target.h"