1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright (C) 2003-2016 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 #define XTENSA_NO_NOP_REMOVAL 0
37 /* Local helper functions. */
39 static bfd_boolean
add_extra_plt_sections (struct bfd_link_info
*, int);
40 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
41 static bfd_reloc_status_type bfd_elf_xtensa_reloc
42 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
43 static bfd_boolean do_fix_for_relocatable_link
44 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*);
45 static void do_fix_for_final_link
46 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*, bfd_vma
*);
48 /* Local functions to handle Xtensa configurability. */
50 static bfd_boolean
is_indirect_call_opcode (xtensa_opcode
);
51 static bfd_boolean
is_direct_call_opcode (xtensa_opcode
);
52 static bfd_boolean
is_windowed_call_opcode (xtensa_opcode
);
53 static xtensa_opcode
get_const16_opcode (void);
54 static xtensa_opcode
get_l32r_opcode (void);
55 static bfd_vma
l32r_offset (bfd_vma
, bfd_vma
);
56 static int get_relocation_opnd (xtensa_opcode
, int);
57 static int get_relocation_slot (int);
58 static xtensa_opcode get_relocation_opcode
59 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
60 static bfd_boolean is_l32r_relocation
61 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
62 static bfd_boolean
is_alt_relocation (int);
63 static bfd_boolean
is_operand_relocation (int);
64 static bfd_size_type insn_decode_len
65 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
66 static xtensa_opcode insn_decode_opcode
67 (bfd_byte
*, bfd_size_type
, bfd_size_type
, int);
68 static bfd_boolean check_branch_target_aligned
69 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
70 static bfd_boolean check_loop_aligned
71 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
72 static bfd_boolean
check_branch_target_aligned_address (bfd_vma
, int);
73 static bfd_size_type get_asm_simplify_size
74 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
76 /* Functions for link-time code simplifications. */
78 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
79 (bfd_byte
*, bfd_vma
, bfd_vma
, char **);
80 static bfd_reloc_status_type contract_asm_expansion
81 (bfd_byte
*, bfd_vma
, Elf_Internal_Rela
*, char **);
82 static xtensa_opcode
swap_callx_for_call_opcode (xtensa_opcode
);
83 static xtensa_opcode
get_expanded_call_opcode (bfd_byte
*, int, bfd_boolean
*);
85 /* Access to internal relocations, section contents and symbols. */
87 static Elf_Internal_Rela
*retrieve_internal_relocs
88 (bfd
*, asection
*, bfd_boolean
);
89 static void pin_internal_relocs (asection
*, Elf_Internal_Rela
*);
90 static void release_internal_relocs (asection
*, Elf_Internal_Rela
*);
91 static bfd_byte
*retrieve_contents (bfd
*, asection
*, bfd_boolean
);
92 static void pin_contents (asection
*, bfd_byte
*);
93 static void release_contents (asection
*, bfd_byte
*);
94 static Elf_Internal_Sym
*retrieve_local_syms (bfd
*);
96 /* Miscellaneous utility functions. */
98 static asection
*elf_xtensa_get_plt_section (struct bfd_link_info
*, int);
99 static asection
*elf_xtensa_get_gotplt_section (struct bfd_link_info
*, int);
100 static asection
*get_elf_r_symndx_section (bfd
*, unsigned long);
101 static struct elf_link_hash_entry
*get_elf_r_symndx_hash_entry
102 (bfd
*, unsigned long);
103 static bfd_vma
get_elf_r_symndx_offset (bfd
*, unsigned long);
104 static bfd_boolean
is_reloc_sym_weak (bfd
*, Elf_Internal_Rela
*);
105 static bfd_boolean
pcrel_reloc_fits (xtensa_opcode
, int, bfd_vma
, bfd_vma
);
106 static bfd_boolean
xtensa_is_property_section (asection
*);
107 static bfd_boolean
xtensa_is_insntable_section (asection
*);
108 static bfd_boolean
xtensa_is_littable_section (asection
*);
109 static bfd_boolean
xtensa_is_proptable_section (asection
*);
110 static int internal_reloc_compare (const void *, const void *);
111 static int internal_reloc_matches (const void *, const void *);
112 static asection
*xtensa_get_property_section (asection
*, const char *);
113 extern asection
*xtensa_make_property_section (asection
*, const char *);
114 static flagword
xtensa_get_property_predef_flags (asection
*);
116 /* Other functions called directly by the linker. */
118 typedef void (*deps_callback_t
)
119 (asection
*, bfd_vma
, asection
*, bfd_vma
, void *);
120 extern bfd_boolean xtensa_callback_required_dependence
121 (bfd
*, asection
*, struct bfd_link_info
*, deps_callback_t
, void *);
124 /* Globally visible flag for choosing size optimization of NOP removal
125 instead of branch-target-aware minimization for NOP removal.
126 When nonzero, narrow all instructions and remove all NOPs possible
127 around longcall expansions. */
129 int elf32xtensa_size_opt
;
132 /* The "new_section_hook" is used to set up a per-section
133 "xtensa_relax_info" data structure with additional information used
134 during relaxation. */
136 typedef struct xtensa_relax_info_struct xtensa_relax_info
;
139 /* The GNU tools do not easily allow extending interfaces to pass around
140 the pointer to the Xtensa ISA information, so instead we add a global
141 variable here (in BFD) that can be used by any of the tools that need
144 xtensa_isa xtensa_default_isa
;
147 /* When this is true, relocations may have been modified to refer to
148 symbols from other input files. The per-section list of "fix"
149 records needs to be checked when resolving relocations. */
151 static bfd_boolean relaxing_section
= FALSE
;
153 /* When this is true, during final links, literals that cannot be
154 coalesced and their relocations may be moved to other sections. */
156 int elf32xtensa_no_literal_movement
= 1;
158 /* Rename one of the generic section flags to better document how it
160 /* Whether relocations have been processed. */
161 #define reloc_done sec_flg0
163 static reloc_howto_type elf_howto_table
[] =
165 HOWTO (R_XTENSA_NONE
, 0, 3, 0, FALSE
, 0, complain_overflow_dont
,
166 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
168 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
169 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
170 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
172 /* Replace a 32-bit value with a value from the runtime linker (only
173 used by linker-generated stub functions). The r_addend value is
174 special: 1 means to substitute a pointer to the runtime linker's
175 dynamic resolver function; 2 means to substitute the link map for
176 the shared object. */
177 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
178 NULL
, "R_XTENSA_RTLD", FALSE
, 0, 0, FALSE
),
180 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
181 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
182 FALSE
, 0, 0xffffffff, FALSE
),
183 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
184 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
185 FALSE
, 0, 0xffffffff, FALSE
),
186 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
187 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
188 FALSE
, 0, 0xffffffff, FALSE
),
189 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
190 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
191 FALSE
, 0, 0xffffffff, FALSE
),
195 /* Old relocations for backward compatibility. */
196 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
197 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0", FALSE
, 0, 0, TRUE
),
198 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
199 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1", FALSE
, 0, 0, TRUE
),
200 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
201 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2", FALSE
, 0, 0, TRUE
),
203 /* Assembly auto-expansion. */
204 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
205 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND", FALSE
, 0, 0, TRUE
),
206 /* Relax assembly auto-expansion. */
207 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
208 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY", FALSE
, 0, 0, TRUE
),
212 HOWTO (R_XTENSA_32_PCREL
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
213 bfd_elf_xtensa_reloc
, "R_XTENSA_32_PCREL",
214 FALSE
, 0, 0xffffffff, TRUE
),
216 /* GNU extension to record C++ vtable hierarchy. */
217 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
218 NULL
, "R_XTENSA_GNU_VTINHERIT",
220 /* GNU extension to record C++ vtable member usage. */
221 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
222 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
225 /* Relocations for supporting difference of symbols. */
226 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_signed
,
227 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8", FALSE
, 0, 0xff, FALSE
),
228 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_signed
,
229 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16", FALSE
, 0, 0xffff, FALSE
),
230 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_signed
,
231 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32", FALSE
, 0, 0xffffffff, FALSE
),
233 /* General immediate operand relocations. */
234 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
235 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP", FALSE
, 0, 0, TRUE
),
236 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
237 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP", FALSE
, 0, 0, TRUE
),
238 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
239 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP", FALSE
, 0, 0, TRUE
),
240 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
241 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP", FALSE
, 0, 0, TRUE
),
242 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
243 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP", FALSE
, 0, 0, TRUE
),
244 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
245 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP", FALSE
, 0, 0, TRUE
),
246 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
247 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP", FALSE
, 0, 0, TRUE
),
248 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
249 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP", FALSE
, 0, 0, TRUE
),
250 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
251 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP", FALSE
, 0, 0, TRUE
),
252 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
253 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP", FALSE
, 0, 0, TRUE
),
254 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
255 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP", FALSE
, 0, 0, TRUE
),
256 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
257 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP", FALSE
, 0, 0, TRUE
),
258 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
259 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP", FALSE
, 0, 0, TRUE
),
260 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
261 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP", FALSE
, 0, 0, TRUE
),
262 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
263 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP", FALSE
, 0, 0, TRUE
),
265 /* "Alternate" relocations. The meaning of these is opcode-specific. */
266 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
267 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT", FALSE
, 0, 0, TRUE
),
268 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
269 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT", FALSE
, 0, 0, TRUE
),
270 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
271 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT", FALSE
, 0, 0, TRUE
),
272 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
273 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT", FALSE
, 0, 0, TRUE
),
274 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
275 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT", FALSE
, 0, 0, TRUE
),
276 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
277 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT", FALSE
, 0, 0, TRUE
),
278 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
279 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT", FALSE
, 0, 0, TRUE
),
280 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
281 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT", FALSE
, 0, 0, TRUE
),
282 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
283 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT", FALSE
, 0, 0, TRUE
),
284 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
285 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT", FALSE
, 0, 0, TRUE
),
286 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
287 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT", FALSE
, 0, 0, TRUE
),
288 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
289 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT", FALSE
, 0, 0, TRUE
),
290 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
291 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT", FALSE
, 0, 0, TRUE
),
292 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
293 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT", FALSE
, 0, 0, TRUE
),
294 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
295 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT", FALSE
, 0, 0, TRUE
),
297 /* TLS relocations. */
298 HOWTO (R_XTENSA_TLSDESC_FN
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
299 bfd_elf_xtensa_reloc
, "R_XTENSA_TLSDESC_FN",
300 FALSE
, 0, 0xffffffff, FALSE
),
301 HOWTO (R_XTENSA_TLSDESC_ARG
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
302 bfd_elf_xtensa_reloc
, "R_XTENSA_TLSDESC_ARG",
303 FALSE
, 0, 0xffffffff, FALSE
),
304 HOWTO (R_XTENSA_TLS_DTPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
305 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_DTPOFF",
306 FALSE
, 0, 0xffffffff, FALSE
),
307 HOWTO (R_XTENSA_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
308 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_TPOFF",
309 FALSE
, 0, 0xffffffff, FALSE
),
310 HOWTO (R_XTENSA_TLS_FUNC
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
311 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_FUNC",
313 HOWTO (R_XTENSA_TLS_ARG
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
314 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_ARG",
316 HOWTO (R_XTENSA_TLS_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
317 bfd_elf_xtensa_reloc
, "R_XTENSA_TLS_CALL",
323 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
328 static reloc_howto_type
*
329 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
330 bfd_reloc_code_real_type code
)
335 TRACE ("BFD_RELOC_NONE");
336 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
339 TRACE ("BFD_RELOC_32");
340 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
342 case BFD_RELOC_32_PCREL
:
343 TRACE ("BFD_RELOC_32_PCREL");
344 return &elf_howto_table
[(unsigned) R_XTENSA_32_PCREL
];
346 case BFD_RELOC_XTENSA_DIFF8
:
347 TRACE ("BFD_RELOC_XTENSA_DIFF8");
348 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
350 case BFD_RELOC_XTENSA_DIFF16
:
351 TRACE ("BFD_RELOC_XTENSA_DIFF16");
352 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
354 case BFD_RELOC_XTENSA_DIFF32
:
355 TRACE ("BFD_RELOC_XTENSA_DIFF32");
356 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
358 case BFD_RELOC_XTENSA_RTLD
:
359 TRACE ("BFD_RELOC_XTENSA_RTLD");
360 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
362 case BFD_RELOC_XTENSA_GLOB_DAT
:
363 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
364 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
366 case BFD_RELOC_XTENSA_JMP_SLOT
:
367 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
368 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
370 case BFD_RELOC_XTENSA_RELATIVE
:
371 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
372 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
374 case BFD_RELOC_XTENSA_PLT
:
375 TRACE ("BFD_RELOC_XTENSA_PLT");
376 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
378 case BFD_RELOC_XTENSA_OP0
:
379 TRACE ("BFD_RELOC_XTENSA_OP0");
380 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
382 case BFD_RELOC_XTENSA_OP1
:
383 TRACE ("BFD_RELOC_XTENSA_OP1");
384 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
386 case BFD_RELOC_XTENSA_OP2
:
387 TRACE ("BFD_RELOC_XTENSA_OP2");
388 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
390 case BFD_RELOC_XTENSA_ASM_EXPAND
:
391 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
392 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
394 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
395 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
396 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
398 case BFD_RELOC_VTABLE_INHERIT
:
399 TRACE ("BFD_RELOC_VTABLE_INHERIT");
400 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
402 case BFD_RELOC_VTABLE_ENTRY
:
403 TRACE ("BFD_RELOC_VTABLE_ENTRY");
404 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
406 case BFD_RELOC_XTENSA_TLSDESC_FN
:
407 TRACE ("BFD_RELOC_XTENSA_TLSDESC_FN");
408 return &elf_howto_table
[(unsigned) R_XTENSA_TLSDESC_FN
];
410 case BFD_RELOC_XTENSA_TLSDESC_ARG
:
411 TRACE ("BFD_RELOC_XTENSA_TLSDESC_ARG");
412 return &elf_howto_table
[(unsigned) R_XTENSA_TLSDESC_ARG
];
414 case BFD_RELOC_XTENSA_TLS_DTPOFF
:
415 TRACE ("BFD_RELOC_XTENSA_TLS_DTPOFF");
416 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_DTPOFF
];
418 case BFD_RELOC_XTENSA_TLS_TPOFF
:
419 TRACE ("BFD_RELOC_XTENSA_TLS_TPOFF");
420 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_TPOFF
];
422 case BFD_RELOC_XTENSA_TLS_FUNC
:
423 TRACE ("BFD_RELOC_XTENSA_TLS_FUNC");
424 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_FUNC
];
426 case BFD_RELOC_XTENSA_TLS_ARG
:
427 TRACE ("BFD_RELOC_XTENSA_TLS_ARG");
428 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_ARG
];
430 case BFD_RELOC_XTENSA_TLS_CALL
:
431 TRACE ("BFD_RELOC_XTENSA_TLS_CALL");
432 return &elf_howto_table
[(unsigned) R_XTENSA_TLS_CALL
];
435 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
436 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
438 unsigned n
= (R_XTENSA_SLOT0_OP
+
439 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
440 return &elf_howto_table
[n
];
443 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
444 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
446 unsigned n
= (R_XTENSA_SLOT0_ALT
+
447 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
448 return &elf_howto_table
[n
];
458 static reloc_howto_type
*
459 elf_xtensa_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
464 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
465 if (elf_howto_table
[i
].name
!= NULL
466 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
467 return &elf_howto_table
[i
];
473 /* Given an ELF "rela" relocation, find the corresponding howto and record
474 it in the BFD internal arelent representation of the relocation. */
477 elf_xtensa_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
479 Elf_Internal_Rela
*dst
)
481 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
483 if (r_type
>= (unsigned int) R_XTENSA_max
)
485 _bfd_error_handler (_("%B: invalid XTENSA reloc number: %d"), abfd
, r_type
);
488 cache_ptr
->howto
= &elf_howto_table
[r_type
];
492 /* Functions for the Xtensa ELF linker. */
494 /* The name of the dynamic interpreter. This is put in the .interp
497 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
499 /* The size in bytes of an entry in the procedure linkage table.
500 (This does _not_ include the space for the literals associated with
503 #define PLT_ENTRY_SIZE 16
505 /* For _really_ large PLTs, we may need to alternate between literals
506 and code to keep the literals within the 256K range of the L32R
507 instructions in the code. It's unlikely that anyone would ever need
508 such a big PLT, but an arbitrary limit on the PLT size would be bad.
509 Thus, we split the PLT into chunks. Since there's very little
510 overhead (2 extra literals) for each chunk, the chunk size is kept
511 small so that the code for handling multiple chunks get used and
512 tested regularly. With 254 entries, there are 1K of literals for
513 each chunk, and that seems like a nice round number. */
515 #define PLT_ENTRIES_PER_CHUNK 254
517 /* PLT entries are actually used as stub functions for lazy symbol
518 resolution. Once the symbol is resolved, the stub function is never
519 invoked. Note: the 32-byte frame size used here cannot be changed
520 without a corresponding change in the runtime linker. */
522 static const bfd_byte elf_xtensa_be_plt_entry
[PLT_ENTRY_SIZE
] =
524 #if XSHAL_ABI == XTHAL_ABI_WINDOWED
525 0x6c, 0x10, 0x04, /* entry sp, 32 */
527 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
528 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
529 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
530 0x0a, 0x80, 0x00, /* jx a8 */
534 static const bfd_byte elf_xtensa_le_plt_entry
[PLT_ENTRY_SIZE
] =
536 #if XSHAL_ABI == XTHAL_ABI_WINDOWED
537 0x36, 0x41, 0x00, /* entry sp, 32 */
539 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
540 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
541 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
542 0xa0, 0x08, 0x00, /* jx a8 */
546 /* The size of the thread control block. */
549 struct elf_xtensa_link_hash_entry
551 struct elf_link_hash_entry elf
;
553 bfd_signed_vma tlsfunc_refcount
;
555 #define GOT_UNKNOWN 0
557 #define GOT_TLS_GD 2 /* global or local dynamic */
558 #define GOT_TLS_IE 4 /* initial or local exec */
559 #define GOT_TLS_ANY (GOT_TLS_GD | GOT_TLS_IE)
560 unsigned char tls_type
;
563 #define elf_xtensa_hash_entry(ent) ((struct elf_xtensa_link_hash_entry *)(ent))
565 struct elf_xtensa_obj_tdata
567 struct elf_obj_tdata root
;
569 /* tls_type for each local got entry. */
570 char *local_got_tls_type
;
572 bfd_signed_vma
*local_tlsfunc_refcounts
;
575 #define elf_xtensa_tdata(abfd) \
576 ((struct elf_xtensa_obj_tdata *) (abfd)->tdata.any)
578 #define elf_xtensa_local_got_tls_type(abfd) \
579 (elf_xtensa_tdata (abfd)->local_got_tls_type)
581 #define elf_xtensa_local_tlsfunc_refcounts(abfd) \
582 (elf_xtensa_tdata (abfd)->local_tlsfunc_refcounts)
584 #define is_xtensa_elf(bfd) \
585 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
586 && elf_tdata (bfd) != NULL \
587 && elf_object_id (bfd) == XTENSA_ELF_DATA)
590 elf_xtensa_mkobject (bfd
*abfd
)
592 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_xtensa_obj_tdata
),
596 /* Xtensa ELF linker hash table. */
598 struct elf_xtensa_link_hash_table
600 struct elf_link_hash_table elf
;
602 /* Short-cuts to get to dynamic linker sections. */
609 asection
*spltlittbl
;
611 /* Total count of PLT relocations seen during check_relocs.
612 The actual PLT code must be split into multiple sections and all
613 the sections have to be created before size_dynamic_sections,
614 where we figure out the exact number of PLT entries that will be
615 needed. It is OK if this count is an overestimate, e.g., some
616 relocations may be removed by GC. */
619 struct elf_xtensa_link_hash_entry
*tlsbase
;
622 /* Get the Xtensa ELF linker hash table from a link_info structure. */
624 #define elf_xtensa_hash_table(p) \
625 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
626 == XTENSA_ELF_DATA ? ((struct elf_xtensa_link_hash_table *) ((p)->hash)) : NULL)
628 /* Create an entry in an Xtensa ELF linker hash table. */
630 static struct bfd_hash_entry
*
631 elf_xtensa_link_hash_newfunc (struct bfd_hash_entry
*entry
,
632 struct bfd_hash_table
*table
,
635 /* Allocate the structure if it has not already been allocated by a
639 entry
= bfd_hash_allocate (table
,
640 sizeof (struct elf_xtensa_link_hash_entry
));
645 /* Call the allocation method of the superclass. */
646 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
649 struct elf_xtensa_link_hash_entry
*eh
= elf_xtensa_hash_entry (entry
);
650 eh
->tlsfunc_refcount
= 0;
651 eh
->tls_type
= GOT_UNKNOWN
;
657 /* Create an Xtensa ELF linker hash table. */
659 static struct bfd_link_hash_table
*
660 elf_xtensa_link_hash_table_create (bfd
*abfd
)
662 struct elf_link_hash_entry
*tlsbase
;
663 struct elf_xtensa_link_hash_table
*ret
;
664 bfd_size_type amt
= sizeof (struct elf_xtensa_link_hash_table
);
666 ret
= bfd_zmalloc (amt
);
670 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
671 elf_xtensa_link_hash_newfunc
,
672 sizeof (struct elf_xtensa_link_hash_entry
),
679 /* Create a hash entry for "_TLS_MODULE_BASE_" to speed up checking
681 tlsbase
= elf_link_hash_lookup (&ret
->elf
, "_TLS_MODULE_BASE_",
683 tlsbase
->root
.type
= bfd_link_hash_new
;
684 tlsbase
->root
.u
.undef
.abfd
= NULL
;
685 tlsbase
->non_elf
= 0;
686 ret
->tlsbase
= elf_xtensa_hash_entry (tlsbase
);
687 ret
->tlsbase
->tls_type
= GOT_UNKNOWN
;
689 return &ret
->elf
.root
;
692 /* Copy the extra info we tack onto an elf_link_hash_entry. */
695 elf_xtensa_copy_indirect_symbol (struct bfd_link_info
*info
,
696 struct elf_link_hash_entry
*dir
,
697 struct elf_link_hash_entry
*ind
)
699 struct elf_xtensa_link_hash_entry
*edir
, *eind
;
701 edir
= elf_xtensa_hash_entry (dir
);
702 eind
= elf_xtensa_hash_entry (ind
);
704 if (ind
->root
.type
== bfd_link_hash_indirect
)
706 edir
->tlsfunc_refcount
+= eind
->tlsfunc_refcount
;
707 eind
->tlsfunc_refcount
= 0;
709 if (dir
->got
.refcount
<= 0)
711 edir
->tls_type
= eind
->tls_type
;
712 eind
->tls_type
= GOT_UNKNOWN
;
716 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
719 static inline bfd_boolean
720 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
721 struct bfd_link_info
*info
)
723 /* Check if we should do dynamic things to this symbol. The
724 "ignore_protected" argument need not be set, because Xtensa code
725 does not require special handling of STV_PROTECTED to make function
726 pointer comparisons work properly. The PLT addresses are never
727 used for function pointers. */
729 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
734 property_table_compare (const void *ap
, const void *bp
)
736 const property_table_entry
*a
= (const property_table_entry
*) ap
;
737 const property_table_entry
*b
= (const property_table_entry
*) bp
;
739 if (a
->address
== b
->address
)
741 if (a
->size
!= b
->size
)
742 return (a
->size
- b
->size
);
744 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
745 return ((b
->flags
& XTENSA_PROP_ALIGN
)
746 - (a
->flags
& XTENSA_PROP_ALIGN
));
748 if ((a
->flags
& XTENSA_PROP_ALIGN
)
749 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
750 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
751 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
752 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
754 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
755 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
756 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
757 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
759 return (a
->flags
- b
->flags
);
762 return (a
->address
- b
->address
);
767 property_table_matches (const void *ap
, const void *bp
)
769 const property_table_entry
*a
= (const property_table_entry
*) ap
;
770 const property_table_entry
*b
= (const property_table_entry
*) bp
;
772 /* Check if one entry overlaps with the other. */
773 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
774 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
777 return (a
->address
- b
->address
);
781 /* Get the literal table or property table entries for the given
782 section. Sets TABLE_P and returns the number of entries. On
783 error, returns a negative value. */
786 xtensa_read_table_entries (bfd
*abfd
,
788 property_table_entry
**table_p
,
789 const char *sec_name
,
790 bfd_boolean output_addr
)
792 asection
*table_section
;
793 bfd_size_type table_size
= 0;
794 bfd_byte
*table_data
;
795 property_table_entry
*blocks
;
796 int blk
, block_count
;
797 bfd_size_type num_records
;
798 Elf_Internal_Rela
*internal_relocs
, *irel
, *rel_end
;
799 bfd_vma section_addr
, off
;
800 flagword predef_flags
;
801 bfd_size_type table_entry_size
, section_limit
;
804 || !(section
->flags
& SEC_ALLOC
)
805 || (section
->flags
& SEC_DEBUGGING
))
811 table_section
= xtensa_get_property_section (section
, sec_name
);
813 table_size
= table_section
->size
;
821 predef_flags
= xtensa_get_property_predef_flags (table_section
);
822 table_entry_size
= 12;
824 table_entry_size
-= 4;
826 num_records
= table_size
/ table_entry_size
;
827 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
828 blocks
= (property_table_entry
*)
829 bfd_malloc (num_records
* sizeof (property_table_entry
));
833 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
835 section_addr
= section
->vma
;
837 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
838 if (internal_relocs
&& !table_section
->reloc_done
)
840 qsort (internal_relocs
, table_section
->reloc_count
,
841 sizeof (Elf_Internal_Rela
), internal_reloc_compare
);
842 irel
= internal_relocs
;
847 section_limit
= bfd_get_section_limit (abfd
, section
);
848 rel_end
= internal_relocs
+ table_section
->reloc_count
;
850 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
852 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
854 /* Skip any relocations before the current offset. This should help
855 avoid confusion caused by unexpected relocations for the preceding
858 (irel
->r_offset
< off
859 || (irel
->r_offset
== off
860 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_NONE
)))
867 if (irel
&& irel
->r_offset
== off
)
870 unsigned long r_symndx
= ELF32_R_SYM (irel
->r_info
);
871 BFD_ASSERT (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
);
873 if (get_elf_r_symndx_section (abfd
, r_symndx
) != section
)
876 sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
877 BFD_ASSERT (sym_off
== 0);
878 address
+= (section_addr
+ sym_off
+ irel
->r_addend
);
882 if (address
< section_addr
883 || address
>= section_addr
+ section_limit
)
887 blocks
[block_count
].address
= address
;
888 blocks
[block_count
].size
= bfd_get_32 (abfd
, table_data
+ off
+ 4);
890 blocks
[block_count
].flags
= predef_flags
;
892 blocks
[block_count
].flags
= bfd_get_32 (abfd
, table_data
+ off
+ 8);
896 release_contents (table_section
, table_data
);
897 release_internal_relocs (table_section
, internal_relocs
);
901 /* Now sort them into address order for easy reference. */
902 qsort (blocks
, block_count
, sizeof (property_table_entry
),
903 property_table_compare
);
905 /* Check that the table contents are valid. Problems may occur,
906 for example, if an unrelocated object file is stripped. */
907 for (blk
= 1; blk
< block_count
; blk
++)
909 /* The only circumstance where two entries may legitimately
910 have the same address is when one of them is a zero-size
911 placeholder to mark a place where fill can be inserted.
912 The zero-size entry should come first. */
913 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
914 blocks
[blk
- 1].size
!= 0)
916 (*_bfd_error_handler
) (_("%B(%A): invalid property table"),
918 bfd_set_error (bfd_error_bad_value
);
930 static property_table_entry
*
931 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
932 int property_table_size
,
935 property_table_entry entry
;
936 property_table_entry
*rv
;
938 if (property_table_size
== 0)
941 entry
.address
= addr
;
945 rv
= bsearch (&entry
, property_table
, property_table_size
,
946 sizeof (property_table_entry
), property_table_matches
);
952 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
956 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
963 /* Look through the relocs for a section during the first phase, and
964 calculate needed space in the dynamic reloc sections. */
967 elf_xtensa_check_relocs (bfd
*abfd
,
968 struct bfd_link_info
*info
,
970 const Elf_Internal_Rela
*relocs
)
972 struct elf_xtensa_link_hash_table
*htab
;
973 Elf_Internal_Shdr
*symtab_hdr
;
974 struct elf_link_hash_entry
**sym_hashes
;
975 const Elf_Internal_Rela
*rel
;
976 const Elf_Internal_Rela
*rel_end
;
978 if (bfd_link_relocatable (info
) || (sec
->flags
& SEC_ALLOC
) == 0)
981 BFD_ASSERT (is_xtensa_elf (abfd
));
983 htab
= elf_xtensa_hash_table (info
);
987 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
988 sym_hashes
= elf_sym_hashes (abfd
);
990 rel_end
= relocs
+ sec
->reloc_count
;
991 for (rel
= relocs
; rel
< rel_end
; rel
++)
994 unsigned long r_symndx
;
995 struct elf_link_hash_entry
*h
= NULL
;
996 struct elf_xtensa_link_hash_entry
*eh
;
997 int tls_type
, old_tls_type
;
998 bfd_boolean is_got
= FALSE
;
999 bfd_boolean is_plt
= FALSE
;
1000 bfd_boolean is_tlsfunc
= FALSE
;
1002 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1003 r_type
= ELF32_R_TYPE (rel
->r_info
);
1005 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1007 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1012 if (r_symndx
>= symtab_hdr
->sh_info
)
1014 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1015 while (h
->root
.type
== bfd_link_hash_indirect
1016 || h
->root
.type
== bfd_link_hash_warning
)
1017 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1019 /* PR15323, ref flags aren't set for references in the same
1021 h
->root
.non_ir_ref
= 1;
1023 eh
= elf_xtensa_hash_entry (h
);
1027 case R_XTENSA_TLSDESC_FN
:
1028 if (bfd_link_pic (info
))
1030 tls_type
= GOT_TLS_GD
;
1035 tls_type
= GOT_TLS_IE
;
1038 case R_XTENSA_TLSDESC_ARG
:
1039 if (bfd_link_pic (info
))
1041 tls_type
= GOT_TLS_GD
;
1046 tls_type
= GOT_TLS_IE
;
1047 if (h
&& elf_xtensa_hash_entry (h
) != htab
->tlsbase
)
1052 case R_XTENSA_TLS_DTPOFF
:
1053 if (bfd_link_pic (info
))
1054 tls_type
= GOT_TLS_GD
;
1056 tls_type
= GOT_TLS_IE
;
1059 case R_XTENSA_TLS_TPOFF
:
1060 tls_type
= GOT_TLS_IE
;
1061 if (bfd_link_pic (info
))
1062 info
->flags
|= DF_STATIC_TLS
;
1063 if (bfd_link_pic (info
) || h
)
1068 tls_type
= GOT_NORMAL
;
1073 tls_type
= GOT_NORMAL
;
1077 case R_XTENSA_GNU_VTINHERIT
:
1078 /* This relocation describes the C++ object vtable hierarchy.
1079 Reconstruct it for later use during GC. */
1080 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1084 case R_XTENSA_GNU_VTENTRY
:
1085 /* This relocation describes which C++ vtable entries are actually
1086 used. Record for later use during GC. */
1087 BFD_ASSERT (h
!= NULL
);
1089 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
1094 /* Nothing to do for any other relocations. */
1102 if (h
->plt
.refcount
<= 0)
1105 h
->plt
.refcount
= 1;
1108 h
->plt
.refcount
+= 1;
1110 /* Keep track of the total PLT relocation count even if we
1111 don't yet know whether the dynamic sections will be
1113 htab
->plt_reloc_count
+= 1;
1115 if (elf_hash_table (info
)->dynamic_sections_created
)
1117 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1123 if (h
->got
.refcount
<= 0)
1124 h
->got
.refcount
= 1;
1126 h
->got
.refcount
+= 1;
1130 eh
->tlsfunc_refcount
+= 1;
1132 old_tls_type
= eh
->tls_type
;
1136 /* Allocate storage the first time. */
1137 if (elf_local_got_refcounts (abfd
) == NULL
)
1139 bfd_size_type size
= symtab_hdr
->sh_info
;
1142 mem
= bfd_zalloc (abfd
, size
* sizeof (bfd_signed_vma
));
1145 elf_local_got_refcounts (abfd
) = (bfd_signed_vma
*) mem
;
1147 mem
= bfd_zalloc (abfd
, size
);
1150 elf_xtensa_local_got_tls_type (abfd
) = (char *) mem
;
1152 mem
= bfd_zalloc (abfd
, size
* sizeof (bfd_signed_vma
));
1155 elf_xtensa_local_tlsfunc_refcounts (abfd
)
1156 = (bfd_signed_vma
*) mem
;
1159 /* This is a global offset table entry for a local symbol. */
1160 if (is_got
|| is_plt
)
1161 elf_local_got_refcounts (abfd
) [r_symndx
] += 1;
1164 elf_xtensa_local_tlsfunc_refcounts (abfd
) [r_symndx
] += 1;
1166 old_tls_type
= elf_xtensa_local_got_tls_type (abfd
) [r_symndx
];
1169 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1170 tls_type
|= old_tls_type
;
1171 /* If a TLS symbol is accessed using IE at least once,
1172 there is no point to use a dynamic model for it. */
1173 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1174 && ((old_tls_type
& GOT_TLS_GD
) == 0
1175 || (tls_type
& GOT_TLS_IE
) == 0))
1177 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_GD
))
1178 tls_type
= old_tls_type
;
1179 else if ((old_tls_type
& GOT_TLS_GD
) && (tls_type
& GOT_TLS_GD
))
1180 tls_type
|= old_tls_type
;
1183 (*_bfd_error_handler
)
1184 (_("%B: `%s' accessed both as normal and thread local symbol"),
1186 h
? h
->root
.root
.string
: "<local>");
1191 if (old_tls_type
!= tls_type
)
1194 eh
->tls_type
= tls_type
;
1196 elf_xtensa_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1205 elf_xtensa_make_sym_local (struct bfd_link_info
*info
,
1206 struct elf_link_hash_entry
*h
)
1208 if (bfd_link_pic (info
))
1210 if (h
->plt
.refcount
> 0)
1212 /* For shared objects, there's no need for PLT entries for local
1213 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
1214 if (h
->got
.refcount
< 0)
1215 h
->got
.refcount
= 0;
1216 h
->got
.refcount
+= h
->plt
.refcount
;
1217 h
->plt
.refcount
= 0;
1222 /* Don't need any dynamic relocations at all. */
1223 h
->plt
.refcount
= 0;
1224 h
->got
.refcount
= 0;
1230 elf_xtensa_hide_symbol (struct bfd_link_info
*info
,
1231 struct elf_link_hash_entry
*h
,
1232 bfd_boolean force_local
)
1234 /* For a shared link, move the plt refcount to the got refcount to leave
1235 space for RELATIVE relocs. */
1236 elf_xtensa_make_sym_local (info
, h
);
1238 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
1242 /* Return the section that should be marked against GC for a given
1246 elf_xtensa_gc_mark_hook (asection
*sec
,
1247 struct bfd_link_info
*info
,
1248 Elf_Internal_Rela
*rel
,
1249 struct elf_link_hash_entry
*h
,
1250 Elf_Internal_Sym
*sym
)
1252 /* Property sections are marked "KEEP" in the linker scripts, but they
1253 should not cause other sections to be marked. (This approach relies
1254 on elf_xtensa_discard_info to remove property table entries that
1255 describe discarded sections. Alternatively, it might be more
1256 efficient to avoid using "KEEP" in the linker scripts and instead use
1257 the gc_mark_extra_sections hook to mark only the property sections
1258 that describe marked sections. That alternative does not work well
1259 with the current property table sections, which do not correspond
1260 one-to-one with the sections they describe, but that should be fixed
1262 if (xtensa_is_property_section (sec
))
1266 switch (ELF32_R_TYPE (rel
->r_info
))
1268 case R_XTENSA_GNU_VTINHERIT
:
1269 case R_XTENSA_GNU_VTENTRY
:
1273 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1277 /* Update the GOT & PLT entry reference counts
1278 for the section being removed. */
1281 elf_xtensa_gc_sweep_hook (bfd
*abfd
,
1282 struct bfd_link_info
*info
,
1284 const Elf_Internal_Rela
*relocs
)
1286 Elf_Internal_Shdr
*symtab_hdr
;
1287 struct elf_link_hash_entry
**sym_hashes
;
1288 const Elf_Internal_Rela
*rel
, *relend
;
1289 struct elf_xtensa_link_hash_table
*htab
;
1291 htab
= elf_xtensa_hash_table (info
);
1295 if (bfd_link_relocatable (info
))
1298 if ((sec
->flags
& SEC_ALLOC
) == 0)
1301 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1302 sym_hashes
= elf_sym_hashes (abfd
);
1304 relend
= relocs
+ sec
->reloc_count
;
1305 for (rel
= relocs
; rel
< relend
; rel
++)
1307 unsigned long r_symndx
;
1308 unsigned int r_type
;
1309 struct elf_link_hash_entry
*h
= NULL
;
1310 struct elf_xtensa_link_hash_entry
*eh
;
1311 bfd_boolean is_got
= FALSE
;
1312 bfd_boolean is_plt
= FALSE
;
1313 bfd_boolean is_tlsfunc
= FALSE
;
1315 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1316 if (r_symndx
>= symtab_hdr
->sh_info
)
1318 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1319 while (h
->root
.type
== bfd_link_hash_indirect
1320 || h
->root
.type
== bfd_link_hash_warning
)
1321 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1323 eh
= elf_xtensa_hash_entry (h
);
1325 r_type
= ELF32_R_TYPE (rel
->r_info
);
1328 case R_XTENSA_TLSDESC_FN
:
1329 if (bfd_link_pic (info
))
1336 case R_XTENSA_TLSDESC_ARG
:
1337 if (bfd_link_pic (info
))
1341 if (h
&& elf_xtensa_hash_entry (h
) != htab
->tlsbase
)
1346 case R_XTENSA_TLS_TPOFF
:
1347 if (bfd_link_pic (info
) || h
)
1367 /* If the symbol has been localized its plt.refcount got moved
1368 to got.refcount. Handle it as GOT. */
1369 if (h
->plt
.refcount
> 0)
1376 if (h
->got
.refcount
> 0)
1381 if (eh
->tlsfunc_refcount
> 0)
1382 eh
->tlsfunc_refcount
--;
1387 if (is_got
|| is_plt
)
1389 bfd_signed_vma
*got_refcount
1390 = &elf_local_got_refcounts (abfd
) [r_symndx
];
1391 if (*got_refcount
> 0)
1396 bfd_signed_vma
*tlsfunc_refcount
1397 = &elf_xtensa_local_tlsfunc_refcounts (abfd
) [r_symndx
];
1398 if (*tlsfunc_refcount
> 0)
1399 *tlsfunc_refcount
-= 1;
1408 /* Create all the dynamic sections. */
1411 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1413 struct elf_xtensa_link_hash_table
*htab
;
1414 flagword flags
, noalloc_flags
;
1416 htab
= elf_xtensa_hash_table (info
);
1420 /* First do all the standard stuff. */
1421 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1423 htab
->splt
= bfd_get_linker_section (dynobj
, ".plt");
1424 htab
->srelplt
= bfd_get_linker_section (dynobj
, ".rela.plt");
1425 htab
->sgot
= bfd_get_linker_section (dynobj
, ".got");
1426 htab
->sgotplt
= bfd_get_linker_section (dynobj
, ".got.plt");
1427 htab
->srelgot
= bfd_get_linker_section (dynobj
, ".rela.got");
1429 /* Create any extra PLT sections in case check_relocs has already
1430 been called on all the non-dynamic input files. */
1431 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1434 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1435 | SEC_LINKER_CREATED
| SEC_READONLY
);
1436 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1438 /* Mark the ".got.plt" section READONLY. */
1439 if (htab
->sgotplt
== NULL
1440 || ! bfd_set_section_flags (dynobj
, htab
->sgotplt
, flags
))
1443 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1444 htab
->sgotloc
= bfd_make_section_anyway_with_flags (dynobj
, ".got.loc",
1446 if (htab
->sgotloc
== NULL
1447 || ! bfd_set_section_alignment (dynobj
, htab
->sgotloc
, 2))
1450 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1451 htab
->spltlittbl
= bfd_make_section_anyway_with_flags (dynobj
, ".xt.lit.plt",
1453 if (htab
->spltlittbl
== NULL
1454 || ! bfd_set_section_alignment (dynobj
, htab
->spltlittbl
, 2))
1462 add_extra_plt_sections (struct bfd_link_info
*info
, int count
)
1464 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
1467 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1468 ".got.plt" sections. */
1469 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1475 /* Stop when we find a section has already been created. */
1476 if (elf_xtensa_get_plt_section (info
, chunk
))
1479 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1480 | SEC_LINKER_CREATED
| SEC_READONLY
);
1482 sname
= (char *) bfd_malloc (10);
1483 sprintf (sname
, ".plt.%u", chunk
);
1484 s
= bfd_make_section_anyway_with_flags (dynobj
, sname
, flags
| SEC_CODE
);
1486 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1489 sname
= (char *) bfd_malloc (14);
1490 sprintf (sname
, ".got.plt.%u", chunk
);
1491 s
= bfd_make_section_anyway_with_flags (dynobj
, sname
, flags
);
1493 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1501 /* Adjust a symbol defined by a dynamic object and referenced by a
1502 regular object. The current definition is in some section of the
1503 dynamic object, but we're not including those sections. We have to
1504 change the definition to something the rest of the link can
1508 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1509 struct elf_link_hash_entry
*h
)
1511 /* If this is a weak symbol, and there is a real definition, the
1512 processor independent code will have arranged for us to see the
1513 real definition first, and we can just use the same value. */
1516 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1517 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1518 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1519 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1523 /* This is a reference to a symbol defined by a dynamic object. The
1524 reference must go through the GOT, so there's no need for COPY relocs,
1532 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *arg
)
1534 struct bfd_link_info
*info
;
1535 struct elf_xtensa_link_hash_table
*htab
;
1536 struct elf_xtensa_link_hash_entry
*eh
= elf_xtensa_hash_entry (h
);
1538 if (h
->root
.type
== bfd_link_hash_indirect
)
1541 info
= (struct bfd_link_info
*) arg
;
1542 htab
= elf_xtensa_hash_table (info
);
1546 /* If we saw any use of an IE model for this symbol, we can then optimize
1547 away GOT entries for any TLSDESC_FN relocs. */
1548 if ((eh
->tls_type
& GOT_TLS_IE
) != 0)
1550 BFD_ASSERT (h
->got
.refcount
>= eh
->tlsfunc_refcount
);
1551 h
->got
.refcount
-= eh
->tlsfunc_refcount
;
1554 if (! elf_xtensa_dynamic_symbol_p (h
, info
))
1555 elf_xtensa_make_sym_local (info
, h
);
1557 if (h
->plt
.refcount
> 0)
1558 htab
->srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1560 if (h
->got
.refcount
> 0)
1561 htab
->srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1568 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
)
1570 struct elf_xtensa_link_hash_table
*htab
;
1573 htab
= elf_xtensa_hash_table (info
);
1577 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
1579 bfd_signed_vma
*local_got_refcounts
;
1580 bfd_size_type j
, cnt
;
1581 Elf_Internal_Shdr
*symtab_hdr
;
1583 local_got_refcounts
= elf_local_got_refcounts (i
);
1584 if (!local_got_refcounts
)
1587 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1588 cnt
= symtab_hdr
->sh_info
;
1590 for (j
= 0; j
< cnt
; ++j
)
1592 /* If we saw any use of an IE model for this symbol, we can
1593 then optimize away GOT entries for any TLSDESC_FN relocs. */
1594 if ((elf_xtensa_local_got_tls_type (i
) [j
] & GOT_TLS_IE
) != 0)
1596 bfd_signed_vma
*tlsfunc_refcount
1597 = &elf_xtensa_local_tlsfunc_refcounts (i
) [j
];
1598 BFD_ASSERT (local_got_refcounts
[j
] >= *tlsfunc_refcount
);
1599 local_got_refcounts
[j
] -= *tlsfunc_refcount
;
1602 if (local_got_refcounts
[j
] > 0)
1603 htab
->srelgot
->size
+= (local_got_refcounts
[j
]
1604 * sizeof (Elf32_External_Rela
));
1610 /* Set the sizes of the dynamic sections. */
1613 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1614 struct bfd_link_info
*info
)
1616 struct elf_xtensa_link_hash_table
*htab
;
1618 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1619 bfd_boolean relplt
, relgot
;
1620 int plt_entries
, plt_chunks
, chunk
;
1625 htab
= elf_xtensa_hash_table (info
);
1629 dynobj
= elf_hash_table (info
)->dynobj
;
1632 srelgot
= htab
->srelgot
;
1633 srelplt
= htab
->srelplt
;
1635 if (elf_hash_table (info
)->dynamic_sections_created
)
1637 BFD_ASSERT (htab
->srelgot
!= NULL
1638 && htab
->srelplt
!= NULL
1639 && htab
->sgot
!= NULL
1640 && htab
->spltlittbl
!= NULL
1641 && htab
->sgotloc
!= NULL
);
1643 /* Set the contents of the .interp section to the interpreter. */
1644 if (bfd_link_executable (info
) && !info
->nointerp
)
1646 s
= bfd_get_linker_section (dynobj
, ".interp");
1649 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1650 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1653 /* Allocate room for one word in ".got". */
1654 htab
->sgot
->size
= 4;
1656 /* Allocate space in ".rela.got" for literals that reference global
1657 symbols and space in ".rela.plt" for literals that have PLT
1659 elf_link_hash_traverse (elf_hash_table (info
),
1660 elf_xtensa_allocate_dynrelocs
,
1663 /* If we are generating a shared object, we also need space in
1664 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1665 reference local symbols. */
1666 if (bfd_link_pic (info
))
1667 elf_xtensa_allocate_local_got_size (info
);
1669 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1670 each PLT entry, we need the PLT code plus a 4-byte literal.
1671 For each chunk of ".plt", we also need two more 4-byte
1672 literals, two corresponding entries in ".rela.got", and an
1673 8-byte entry in ".xt.lit.plt". */
1674 spltlittbl
= htab
->spltlittbl
;
1675 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1677 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1679 /* Iterate over all the PLT chunks, including any extra sections
1680 created earlier because the initial count of PLT relocations
1681 was an overestimate. */
1683 (splt
= elf_xtensa_get_plt_section (info
, chunk
)) != NULL
;
1688 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1689 BFD_ASSERT (sgotplt
!= NULL
);
1691 if (chunk
< plt_chunks
- 1)
1692 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1693 else if (chunk
== plt_chunks
- 1)
1694 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1698 if (chunk_entries
!= 0)
1700 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1701 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1702 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1703 spltlittbl
->size
+= 8;
1712 /* Allocate space in ".got.loc" to match the total size of all the
1714 sgotloc
= htab
->sgotloc
;
1715 sgotloc
->size
= spltlittbl
->size
;
1716 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
1718 if (abfd
->flags
& DYNAMIC
)
1720 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1722 if (! discarded_section (s
)
1723 && xtensa_is_littable_section (s
)
1725 sgotloc
->size
+= s
->size
;
1730 /* Allocate memory for dynamic sections. */
1733 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1737 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1740 /* It's OK to base decisions on the section name, because none
1741 of the dynobj section names depend upon the input files. */
1742 name
= bfd_get_section_name (dynobj
, s
);
1744 if (CONST_STRNEQ (name
, ".rela"))
1748 if (strcmp (name
, ".rela.plt") == 0)
1750 else if (strcmp (name
, ".rela.got") == 0)
1753 /* We use the reloc_count field as a counter if we need
1754 to copy relocs into the output file. */
1758 else if (! CONST_STRNEQ (name
, ".plt.")
1759 && ! CONST_STRNEQ (name
, ".got.plt.")
1760 && strcmp (name
, ".got") != 0
1761 && strcmp (name
, ".plt") != 0
1762 && strcmp (name
, ".got.plt") != 0
1763 && strcmp (name
, ".xt.lit.plt") != 0
1764 && strcmp (name
, ".got.loc") != 0)
1766 /* It's not one of our sections, so don't allocate space. */
1772 /* If we don't need this section, strip it from the output
1773 file. We must create the ".plt*" and ".got.plt*"
1774 sections in create_dynamic_sections and/or check_relocs
1775 based on a conservative estimate of the PLT relocation
1776 count, because the sections must be created before the
1777 linker maps input sections to output sections. The
1778 linker does that before size_dynamic_sections, where we
1779 compute the exact size of the PLT, so there may be more
1780 of these sections than are actually needed. */
1781 s
->flags
|= SEC_EXCLUDE
;
1783 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1785 /* Allocate memory for the section contents. */
1786 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1787 if (s
->contents
== NULL
)
1792 if (elf_hash_table (info
)->dynamic_sections_created
)
1794 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1795 known until finish_dynamic_sections, but we need to get the relocs
1796 in place before they are sorted. */
1797 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1799 Elf_Internal_Rela irela
;
1803 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1806 loc
= (srelgot
->contents
1807 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1808 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1809 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1810 loc
+ sizeof (Elf32_External_Rela
));
1811 srelgot
->reloc_count
+= 2;
1814 /* Add some entries to the .dynamic section. We fill in the
1815 values later, in elf_xtensa_finish_dynamic_sections, but we
1816 must add the entries now so that we get the correct size for
1817 the .dynamic section. The DT_DEBUG entry is filled in by the
1818 dynamic linker and used by the debugger. */
1819 #define add_dynamic_entry(TAG, VAL) \
1820 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1822 if (bfd_link_executable (info
))
1824 if (!add_dynamic_entry (DT_DEBUG
, 0))
1830 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
1831 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1832 || !add_dynamic_entry (DT_JMPREL
, 0))
1838 if (!add_dynamic_entry (DT_RELA
, 0)
1839 || !add_dynamic_entry (DT_RELASZ
, 0)
1840 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1844 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1845 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1846 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1849 #undef add_dynamic_entry
1855 elf_xtensa_always_size_sections (bfd
*output_bfd
,
1856 struct bfd_link_info
*info
)
1858 struct elf_xtensa_link_hash_table
*htab
;
1861 htab
= elf_xtensa_hash_table (info
);
1865 tls_sec
= htab
->elf
.tls_sec
;
1867 if (tls_sec
&& (htab
->tlsbase
->tls_type
& GOT_TLS_ANY
) != 0)
1869 struct elf_link_hash_entry
*tlsbase
= &htab
->tlsbase
->elf
;
1870 struct bfd_link_hash_entry
*bh
= &tlsbase
->root
;
1871 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
1873 tlsbase
->type
= STT_TLS
;
1874 if (!(_bfd_generic_link_add_one_symbol
1875 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1876 tls_sec
, 0, NULL
, FALSE
,
1877 bed
->collect
, &bh
)))
1879 tlsbase
->def_regular
= 1;
1880 tlsbase
->other
= STV_HIDDEN
;
1881 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1888 /* Return the base VMA address which should be subtracted from real addresses
1889 when resolving @dtpoff relocation.
1890 This is PT_TLS segment p_vaddr. */
1893 dtpoff_base (struct bfd_link_info
*info
)
1895 /* If tls_sec is NULL, we should have signalled an error already. */
1896 if (elf_hash_table (info
)->tls_sec
== NULL
)
1898 return elf_hash_table (info
)->tls_sec
->vma
;
1901 /* Return the relocation value for @tpoff relocation
1902 if STT_TLS virtual address is ADDRESS. */
1905 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
1907 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
1910 /* If tls_sec is NULL, we should have signalled an error already. */
1911 if (htab
->tls_sec
== NULL
)
1913 base
= align_power ((bfd_vma
) TCB_SIZE
, htab
->tls_sec
->alignment_power
);
1914 return address
- htab
->tls_sec
->vma
+ base
;
1917 /* Perform the specified relocation. The instruction at (contents + address)
1918 is modified to set one operand to represent the value in "relocation". The
1919 operand position is determined by the relocation type recorded in the
1922 #define CALL_SEGMENT_BITS (30)
1923 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1925 static bfd_reloc_status_type
1926 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1928 asection
*input_section
,
1932 bfd_boolean is_weak_undef
,
1933 char **error_message
)
1936 xtensa_opcode opcode
;
1937 xtensa_isa isa
= xtensa_default_isa
;
1938 static xtensa_insnbuf ibuff
= NULL
;
1939 static xtensa_insnbuf sbuff
= NULL
;
1940 bfd_vma self_address
;
1941 bfd_size_type input_size
;
1947 ibuff
= xtensa_insnbuf_alloc (isa
);
1948 sbuff
= xtensa_insnbuf_alloc (isa
);
1951 input_size
= bfd_get_section_limit (abfd
, input_section
);
1953 /* Calculate the PC address for this instruction. */
1954 self_address
= (input_section
->output_section
->vma
1955 + input_section
->output_offset
1958 switch (howto
->type
)
1961 case R_XTENSA_DIFF8
:
1962 case R_XTENSA_DIFF16
:
1963 case R_XTENSA_DIFF32
:
1964 case R_XTENSA_TLS_FUNC
:
1965 case R_XTENSA_TLS_ARG
:
1966 case R_XTENSA_TLS_CALL
:
1967 return bfd_reloc_ok
;
1969 case R_XTENSA_ASM_EXPAND
:
1972 /* Check for windowed CALL across a 1GB boundary. */
1973 opcode
= get_expanded_call_opcode (contents
+ address
,
1974 input_size
- address
, 0);
1975 if (is_windowed_call_opcode (opcode
))
1977 if ((self_address
>> CALL_SEGMENT_BITS
)
1978 != (relocation
>> CALL_SEGMENT_BITS
))
1980 *error_message
= "windowed longcall crosses 1GB boundary; "
1982 return bfd_reloc_dangerous
;
1986 return bfd_reloc_ok
;
1988 case R_XTENSA_ASM_SIMPLIFY
:
1990 /* Convert the L32R/CALLX to CALL. */
1991 bfd_reloc_status_type retval
=
1992 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1994 if (retval
!= bfd_reloc_ok
)
1995 return bfd_reloc_dangerous
;
1997 /* The CALL needs to be relocated. Continue below for that part. */
2000 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
2007 x
= bfd_get_32 (abfd
, contents
+ address
);
2009 bfd_put_32 (abfd
, x
, contents
+ address
);
2011 return bfd_reloc_ok
;
2013 case R_XTENSA_32_PCREL
:
2014 bfd_put_32 (abfd
, relocation
- self_address
, contents
+ address
);
2015 return bfd_reloc_ok
;
2018 case R_XTENSA_TLSDESC_FN
:
2019 case R_XTENSA_TLSDESC_ARG
:
2020 case R_XTENSA_TLS_DTPOFF
:
2021 case R_XTENSA_TLS_TPOFF
:
2022 bfd_put_32 (abfd
, relocation
, contents
+ address
);
2023 return bfd_reloc_ok
;
2026 /* Only instruction slot-specific relocations handled below.... */
2027 slot
= get_relocation_slot (howto
->type
);
2028 if (slot
== XTENSA_UNDEFINED
)
2030 *error_message
= "unexpected relocation";
2031 return bfd_reloc_dangerous
;
2034 /* Read the instruction into a buffer and decode the opcode. */
2035 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
2036 input_size
- address
);
2037 fmt
= xtensa_format_decode (isa
, ibuff
);
2038 if (fmt
== XTENSA_UNDEFINED
)
2040 *error_message
= "cannot decode instruction format";
2041 return bfd_reloc_dangerous
;
2044 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
2046 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
2047 if (opcode
== XTENSA_UNDEFINED
)
2049 *error_message
= "cannot decode instruction opcode";
2050 return bfd_reloc_dangerous
;
2053 /* Check for opcode-specific "alternate" relocations. */
2054 if (is_alt_relocation (howto
->type
))
2056 if (opcode
== get_l32r_opcode ())
2058 /* Handle the special-case of non-PC-relative L32R instructions. */
2059 bfd
*output_bfd
= input_section
->output_section
->owner
;
2060 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
2063 *error_message
= "relocation references missing .lit4 section";
2064 return bfd_reloc_dangerous
;
2066 self_address
= ((lit4_sec
->vma
& ~0xfff)
2067 + 0x40000 - 3); /* -3 to compensate for do_reloc */
2068 newval
= relocation
;
2071 else if (opcode
== get_const16_opcode ())
2073 /* ALT used for high 16 bits. */
2074 newval
= relocation
>> 16;
2079 /* No other "alternate" relocations currently defined. */
2080 *error_message
= "unexpected relocation";
2081 return bfd_reloc_dangerous
;
2084 else /* Not an "alternate" relocation.... */
2086 if (opcode
== get_const16_opcode ())
2088 newval
= relocation
& 0xffff;
2093 /* ...normal PC-relative relocation.... */
2095 /* Determine which operand is being relocated. */
2096 opnd
= get_relocation_opnd (opcode
, howto
->type
);
2097 if (opnd
== XTENSA_UNDEFINED
)
2099 *error_message
= "unexpected relocation";
2100 return bfd_reloc_dangerous
;
2103 if (!howto
->pc_relative
)
2105 *error_message
= "expected PC-relative relocation";
2106 return bfd_reloc_dangerous
;
2109 newval
= relocation
;
2113 /* Apply the relocation. */
2114 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
2115 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
2116 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
2119 const char *opname
= xtensa_opcode_name (isa
, opcode
);
2122 msg
= "cannot encode";
2123 if (is_direct_call_opcode (opcode
))
2125 if ((relocation
& 0x3) != 0)
2126 msg
= "misaligned call target";
2128 msg
= "call target out of range";
2130 else if (opcode
== get_l32r_opcode ())
2132 if ((relocation
& 0x3) != 0)
2133 msg
= "misaligned literal target";
2134 else if (is_alt_relocation (howto
->type
))
2135 msg
= "literal target out of range (too many literals)";
2136 else if (self_address
> relocation
)
2137 msg
= "literal target out of range (try using text-section-literals)";
2139 msg
= "literal placed after use";
2142 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
2143 return bfd_reloc_dangerous
;
2146 /* Check for calls across 1GB boundaries. */
2147 if (is_direct_call_opcode (opcode
)
2148 && is_windowed_call_opcode (opcode
))
2150 if ((self_address
>> CALL_SEGMENT_BITS
)
2151 != (relocation
>> CALL_SEGMENT_BITS
))
2154 "windowed call crosses 1GB boundary; return may fail";
2155 return bfd_reloc_dangerous
;
2159 /* Write the modified instruction back out of the buffer. */
2160 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
2161 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
2162 input_size
- address
);
2163 return bfd_reloc_ok
;
2168 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
2170 /* To reduce the size of the memory leak,
2171 we only use a single message buffer. */
2172 static bfd_size_type alloc_size
= 0;
2173 static char *message
= NULL
;
2174 bfd_size_type orig_len
, len
= 0;
2175 bfd_boolean is_append
;
2178 va_start (ap
, arglen
);
2180 is_append
= (origmsg
== message
);
2182 orig_len
= strlen (origmsg
);
2183 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
2184 if (len
> alloc_size
)
2186 message
= (char *) bfd_realloc_or_free (message
, len
);
2189 if (message
!= NULL
)
2192 memcpy (message
, origmsg
, orig_len
);
2193 vsprintf (message
+ orig_len
, fmt
, ap
);
2200 /* This function is registered as the "special_function" in the
2201 Xtensa howto for handling simplify operations.
2202 bfd_perform_relocation / bfd_install_relocation use it to
2203 perform (install) the specified relocation. Since this replaces the code
2204 in bfd_perform_relocation, it is basically an Xtensa-specific,
2205 stripped-down version of bfd_perform_relocation. */
2207 static bfd_reloc_status_type
2208 bfd_elf_xtensa_reloc (bfd
*abfd
,
2209 arelent
*reloc_entry
,
2212 asection
*input_section
,
2214 char **error_message
)
2217 bfd_reloc_status_type flag
;
2218 bfd_size_type octets
= reloc_entry
->address
* bfd_octets_per_byte (abfd
);
2219 bfd_vma output_base
= 0;
2220 reloc_howto_type
*howto
= reloc_entry
->howto
;
2221 asection
*reloc_target_output_section
;
2222 bfd_boolean is_weak_undef
;
2224 if (!xtensa_default_isa
)
2225 xtensa_default_isa
= xtensa_isa_init (0, 0);
2227 /* ELF relocs are against symbols. If we are producing relocatable
2228 output, and the reloc is against an external symbol, the resulting
2229 reloc will also be against the same symbol. In such a case, we
2230 don't want to change anything about the way the reloc is handled,
2231 since it will all be done at final link time. This test is similar
2232 to what bfd_elf_generic_reloc does except that it lets relocs with
2233 howto->partial_inplace go through even if the addend is non-zero.
2234 (The real problem is that partial_inplace is set for XTENSA_32
2235 relocs to begin with, but that's a long story and there's little we
2236 can do about it now....) */
2238 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
2240 reloc_entry
->address
+= input_section
->output_offset
;
2241 return bfd_reloc_ok
;
2244 /* Is the address of the relocation really within the section? */
2245 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
2246 return bfd_reloc_outofrange
;
2248 /* Work out which section the relocation is targeted at and the
2249 initial relocation command value. */
2251 /* Get symbol value. (Common symbols are special.) */
2252 if (bfd_is_com_section (symbol
->section
))
2255 relocation
= symbol
->value
;
2257 reloc_target_output_section
= symbol
->section
->output_section
;
2259 /* Convert input-section-relative symbol value to absolute. */
2260 if ((output_bfd
&& !howto
->partial_inplace
)
2261 || reloc_target_output_section
== NULL
)
2264 output_base
= reloc_target_output_section
->vma
;
2266 relocation
+= output_base
+ symbol
->section
->output_offset
;
2268 /* Add in supplied addend. */
2269 relocation
+= reloc_entry
->addend
;
2271 /* Here the variable relocation holds the final address of the
2272 symbol we are relocating against, plus any addend. */
2275 if (!howto
->partial_inplace
)
2277 /* This is a partial relocation, and we want to apply the relocation
2278 to the reloc entry rather than the raw data. Everything except
2279 relocations against section symbols has already been handled
2282 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
2283 reloc_entry
->addend
= relocation
;
2284 reloc_entry
->address
+= input_section
->output_offset
;
2285 return bfd_reloc_ok
;
2289 reloc_entry
->address
+= input_section
->output_offset
;
2290 reloc_entry
->addend
= 0;
2294 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
2295 && (symbol
->flags
& BSF_WEAK
) != 0);
2296 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
2297 (bfd_byte
*) data
, (bfd_vma
) octets
,
2298 is_weak_undef
, error_message
);
2300 if (flag
== bfd_reloc_dangerous
)
2302 /* Add the symbol name to the error message. */
2303 if (! *error_message
)
2304 *error_message
= "";
2305 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
2306 strlen (symbol
->name
) + 17,
2308 (unsigned long) reloc_entry
->addend
);
2315 /* Set up an entry in the procedure linkage table. */
2318 elf_xtensa_create_plt_entry (struct bfd_link_info
*info
,
2320 unsigned reloc_index
)
2322 asection
*splt
, *sgotplt
;
2323 bfd_vma plt_base
, got_base
;
2324 bfd_vma code_offset
, lit_offset
, abi_offset
;
2327 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
2328 splt
= elf_xtensa_get_plt_section (info
, chunk
);
2329 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
2330 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
2332 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
2333 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
2335 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
2336 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
2338 /* Fill in the literal entry. This is the offset of the dynamic
2339 relocation entry. */
2340 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
2341 sgotplt
->contents
+ lit_offset
);
2343 /* Fill in the entry in the procedure linkage table. */
2344 memcpy (splt
->contents
+ code_offset
,
2345 (bfd_big_endian (output_bfd
)
2346 ? elf_xtensa_be_plt_entry
2347 : elf_xtensa_le_plt_entry
),
2349 abi_offset
= XSHAL_ABI
== XTHAL_ABI_WINDOWED
? 3 : 0;
2350 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
2351 plt_base
+ code_offset
+ abi_offset
),
2352 splt
->contents
+ code_offset
+ abi_offset
+ 1);
2353 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
2354 plt_base
+ code_offset
+ abi_offset
+ 3),
2355 splt
->contents
+ code_offset
+ abi_offset
+ 4);
2356 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
2357 plt_base
+ code_offset
+ abi_offset
+ 6),
2358 splt
->contents
+ code_offset
+ abi_offset
+ 7);
2360 return plt_base
+ code_offset
;
2364 static bfd_boolean
get_indirect_call_dest_reg (xtensa_opcode
, unsigned *);
2367 replace_tls_insn (Elf_Internal_Rela
*rel
,
2369 asection
*input_section
,
2371 bfd_boolean is_ld_model
,
2372 char **error_message
)
2374 static xtensa_insnbuf ibuff
= NULL
;
2375 static xtensa_insnbuf sbuff
= NULL
;
2376 xtensa_isa isa
= xtensa_default_isa
;
2378 xtensa_opcode old_op
, new_op
;
2379 bfd_size_type input_size
;
2381 unsigned dest_reg
, src_reg
;
2385 ibuff
= xtensa_insnbuf_alloc (isa
);
2386 sbuff
= xtensa_insnbuf_alloc (isa
);
2389 input_size
= bfd_get_section_limit (abfd
, input_section
);
2391 /* Read the instruction into a buffer and decode the opcode. */
2392 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ rel
->r_offset
,
2393 input_size
- rel
->r_offset
);
2394 fmt
= xtensa_format_decode (isa
, ibuff
);
2395 if (fmt
== XTENSA_UNDEFINED
)
2397 *error_message
= "cannot decode instruction format";
2401 BFD_ASSERT (xtensa_format_num_slots (isa
, fmt
) == 1);
2402 xtensa_format_get_slot (isa
, fmt
, 0, ibuff
, sbuff
);
2404 old_op
= xtensa_opcode_decode (isa
, fmt
, 0, sbuff
);
2405 if (old_op
== XTENSA_UNDEFINED
)
2407 *error_message
= "cannot decode instruction opcode";
2411 r_type
= ELF32_R_TYPE (rel
->r_info
);
2414 case R_XTENSA_TLS_FUNC
:
2415 case R_XTENSA_TLS_ARG
:
2416 if (old_op
!= get_l32r_opcode ()
2417 || xtensa_operand_get_field (isa
, old_op
, 0, fmt
, 0,
2418 sbuff
, &dest_reg
) != 0)
2420 *error_message
= "cannot extract L32R destination for TLS access";
2425 case R_XTENSA_TLS_CALL
:
2426 if (! get_indirect_call_dest_reg (old_op
, &dest_reg
)
2427 || xtensa_operand_get_field (isa
, old_op
, 0, fmt
, 0,
2428 sbuff
, &src_reg
) != 0)
2430 *error_message
= "cannot extract CALLXn operands for TLS access";
2443 case R_XTENSA_TLS_FUNC
:
2444 case R_XTENSA_TLS_ARG
:
2445 /* Change the instruction to a NOP (or "OR a1, a1, a1" for older
2446 versions of Xtensa). */
2447 new_op
= xtensa_opcode_lookup (isa
, "nop");
2448 if (new_op
== XTENSA_UNDEFINED
)
2450 new_op
= xtensa_opcode_lookup (isa
, "or");
2451 if (new_op
== XTENSA_UNDEFINED
2452 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2453 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2455 || xtensa_operand_set_field (isa
, new_op
, 1, fmt
, 0,
2457 || xtensa_operand_set_field (isa
, new_op
, 2, fmt
, 0,
2460 *error_message
= "cannot encode OR for TLS access";
2466 if (xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0)
2468 *error_message
= "cannot encode NOP for TLS access";
2474 case R_XTENSA_TLS_CALL
:
2475 /* Read THREADPTR into the CALLX's return value register. */
2476 new_op
= xtensa_opcode_lookup (isa
, "rur.threadptr");
2477 if (new_op
== XTENSA_UNDEFINED
2478 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2479 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2480 sbuff
, dest_reg
+ 2) != 0)
2482 *error_message
= "cannot encode RUR.THREADPTR for TLS access";
2492 case R_XTENSA_TLS_FUNC
:
2493 new_op
= xtensa_opcode_lookup (isa
, "rur.threadptr");
2494 if (new_op
== XTENSA_UNDEFINED
2495 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2496 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2497 sbuff
, dest_reg
) != 0)
2499 *error_message
= "cannot encode RUR.THREADPTR for TLS access";
2504 case R_XTENSA_TLS_ARG
:
2505 /* Nothing to do. Keep the original L32R instruction. */
2508 case R_XTENSA_TLS_CALL
:
2509 /* Add the CALLX's src register (holding the THREADPTR value)
2510 to the first argument register (holding the offset) and put
2511 the result in the CALLX's return value register. */
2512 new_op
= xtensa_opcode_lookup (isa
, "add");
2513 if (new_op
== XTENSA_UNDEFINED
2514 || xtensa_opcode_encode (isa
, fmt
, 0, sbuff
, new_op
) != 0
2515 || xtensa_operand_set_field (isa
, new_op
, 0, fmt
, 0,
2516 sbuff
, dest_reg
+ 2) != 0
2517 || xtensa_operand_set_field (isa
, new_op
, 1, fmt
, 0,
2518 sbuff
, dest_reg
+ 2) != 0
2519 || xtensa_operand_set_field (isa
, new_op
, 2, fmt
, 0,
2520 sbuff
, src_reg
) != 0)
2522 *error_message
= "cannot encode ADD for TLS access";
2529 xtensa_format_set_slot (isa
, fmt
, 0, ibuff
, sbuff
);
2530 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ rel
->r_offset
,
2531 input_size
- rel
->r_offset
);
2537 #define IS_XTENSA_TLS_RELOC(R_TYPE) \
2538 ((R_TYPE) == R_XTENSA_TLSDESC_FN \
2539 || (R_TYPE) == R_XTENSA_TLSDESC_ARG \
2540 || (R_TYPE) == R_XTENSA_TLS_DTPOFF \
2541 || (R_TYPE) == R_XTENSA_TLS_TPOFF \
2542 || (R_TYPE) == R_XTENSA_TLS_FUNC \
2543 || (R_TYPE) == R_XTENSA_TLS_ARG \
2544 || (R_TYPE) == R_XTENSA_TLS_CALL)
2546 /* Relocate an Xtensa ELF section. This is invoked by the linker for
2547 both relocatable and final links. */
2550 elf_xtensa_relocate_section (bfd
*output_bfd
,
2551 struct bfd_link_info
*info
,
2553 asection
*input_section
,
2555 Elf_Internal_Rela
*relocs
,
2556 Elf_Internal_Sym
*local_syms
,
2557 asection
**local_sections
)
2559 struct elf_xtensa_link_hash_table
*htab
;
2560 Elf_Internal_Shdr
*symtab_hdr
;
2561 Elf_Internal_Rela
*rel
;
2562 Elf_Internal_Rela
*relend
;
2563 struct elf_link_hash_entry
**sym_hashes
;
2564 property_table_entry
*lit_table
= 0;
2566 char *local_got_tls_types
;
2567 char *error_message
= NULL
;
2568 bfd_size_type input_size
;
2571 if (!xtensa_default_isa
)
2572 xtensa_default_isa
= xtensa_isa_init (0, 0);
2574 BFD_ASSERT (is_xtensa_elf (input_bfd
));
2576 htab
= elf_xtensa_hash_table (info
);
2580 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2581 sym_hashes
= elf_sym_hashes (input_bfd
);
2582 local_got_tls_types
= elf_xtensa_local_got_tls_type (input_bfd
);
2584 if (elf_hash_table (info
)->dynamic_sections_created
)
2586 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
2587 &lit_table
, XTENSA_LIT_SEC_NAME
,
2593 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
2596 relend
= relocs
+ input_section
->reloc_count
;
2597 for (; rel
< relend
; rel
++)
2600 reloc_howto_type
*howto
;
2601 unsigned long r_symndx
;
2602 struct elf_link_hash_entry
*h
;
2603 Elf_Internal_Sym
*sym
;
2608 bfd_reloc_status_type r
;
2609 bfd_boolean is_weak_undef
;
2610 bfd_boolean unresolved_reloc
;
2612 bfd_boolean dynamic_symbol
;
2614 r_type
= ELF32_R_TYPE (rel
->r_info
);
2615 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
2616 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
2619 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
2621 bfd_set_error (bfd_error_bad_value
);
2624 howto
= &elf_howto_table
[r_type
];
2626 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2631 is_weak_undef
= FALSE
;
2632 unresolved_reloc
= FALSE
;
2635 if (howto
->partial_inplace
&& !bfd_link_relocatable (info
))
2637 /* Because R_XTENSA_32 was made partial_inplace to fix some
2638 problems with DWARF info in partial links, there may be
2639 an addend stored in the contents. Take it out of there
2640 and move it back into the addend field of the reloc. */
2641 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2642 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2645 if (r_symndx
< symtab_hdr
->sh_info
)
2647 sym
= local_syms
+ r_symndx
;
2648 sym_type
= ELF32_ST_TYPE (sym
->st_info
);
2649 sec
= local_sections
[r_symndx
];
2650 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2654 bfd_boolean ignored
;
2656 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2657 r_symndx
, symtab_hdr
, sym_hashes
,
2659 unresolved_reloc
, warned
, ignored
);
2662 && !unresolved_reloc
2663 && h
->root
.type
== bfd_link_hash_undefweak
)
2664 is_weak_undef
= TRUE
;
2669 if (sec
!= NULL
&& discarded_section (sec
))
2670 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2671 rel
, 1, relend
, howto
, 0, contents
);
2673 if (bfd_link_relocatable (info
))
2676 asection
* sym_sec
= get_elf_r_symndx_section (input_bfd
, r_symndx
);
2678 /* This is a relocatable link.
2679 1) If the reloc is against a section symbol, adjust
2680 according to the output section.
2681 2) If there is a new target for this relocation,
2682 the new target will be in the same output section.
2683 We adjust the relocation by the output section
2686 if (relaxing_section
)
2688 /* Check if this references a section in another input file. */
2689 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2694 dest_addr
= sym_sec
->output_section
->vma
+ sym_sec
->output_offset
2695 + get_elf_r_symndx_offset (input_bfd
, r_symndx
) + rel
->r_addend
;
2697 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2699 error_message
= NULL
;
2700 /* Convert ASM_SIMPLIFY into the simpler relocation
2701 so that they never escape a relaxing link. */
2702 r
= contract_asm_expansion (contents
, input_size
, rel
,
2704 if (r
!= bfd_reloc_ok
)
2705 (*info
->callbacks
->reloc_dangerous
)
2706 (info
, error_message
,
2707 input_bfd
, input_section
, rel
->r_offset
);
2709 r_type
= ELF32_R_TYPE (rel
->r_info
);
2712 /* This is a relocatable link, so we don't have to change
2713 anything unless the reloc is against a section symbol,
2714 in which case we have to adjust according to where the
2715 section symbol winds up in the output section. */
2716 if (r_symndx
< symtab_hdr
->sh_info
)
2718 sym
= local_syms
+ r_symndx
;
2719 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2721 sec
= local_sections
[r_symndx
];
2722 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2726 /* If there is an addend with a partial_inplace howto,
2727 then move the addend to the contents. This is a hack
2728 to work around problems with DWARF in relocatable links
2729 with some previous version of BFD. Now we can't easily get
2730 rid of the hack without breaking backward compatibility.... */
2732 howto
= &elf_howto_table
[r_type
];
2733 if (howto
->partial_inplace
&& rel
->r_addend
)
2735 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2736 rel
->r_addend
, contents
,
2737 rel
->r_offset
, FALSE
,
2743 /* Put the correct bits in the target instruction, even
2744 though the relocation will still be present in the output
2745 file. This makes disassembly clearer, as well as
2746 allowing loadable kernel modules to work without needing
2747 relocations on anything other than calls and l32r's. */
2749 /* If it is not in the same section, there is nothing we can do. */
2750 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
&&
2751 sym_sec
->output_section
== input_section
->output_section
)
2753 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2754 dest_addr
, contents
,
2755 rel
->r_offset
, FALSE
,
2759 if (r
!= bfd_reloc_ok
)
2760 (*info
->callbacks
->reloc_dangerous
)
2761 (info
, error_message
,
2762 input_bfd
, input_section
, rel
->r_offset
);
2764 /* Done with work for relocatable link; continue with next reloc. */
2768 /* This is a final link. */
2770 if (relaxing_section
)
2772 /* Check if this references a section in another input file. */
2773 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2777 /* Sanity check the address. */
2778 if (rel
->r_offset
>= input_size
2779 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2781 (*_bfd_error_handler
)
2782 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2783 input_bfd
, input_section
, rel
->r_offset
, input_size
);
2784 bfd_set_error (bfd_error_bad_value
);
2789 name
= h
->root
.root
.string
;
2792 name
= (bfd_elf_string_from_elf_section
2793 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2794 if (name
== NULL
|| *name
== '\0')
2795 name
= bfd_section_name (input_bfd
, sec
);
2798 if (r_symndx
!= STN_UNDEF
2799 && r_type
!= R_XTENSA_NONE
2801 || h
->root
.type
== bfd_link_hash_defined
2802 || h
->root
.type
== bfd_link_hash_defweak
)
2803 && IS_XTENSA_TLS_RELOC (r_type
) != (sym_type
== STT_TLS
))
2805 (*_bfd_error_handler
)
2806 ((sym_type
== STT_TLS
2807 ? _("%B(%A+0x%lx): %s used with TLS symbol %s")
2808 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")),
2811 (long) rel
->r_offset
,
2816 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
2818 tls_type
= GOT_UNKNOWN
;
2820 tls_type
= elf_xtensa_hash_entry (h
)->tls_type
;
2821 else if (local_got_tls_types
)
2822 tls_type
= local_got_tls_types
[r_symndx
];
2828 if (elf_hash_table (info
)->dynamic_sections_created
2829 && (input_section
->flags
& SEC_ALLOC
) != 0
2830 && (dynamic_symbol
|| bfd_link_pic (info
)))
2832 Elf_Internal_Rela outrel
;
2836 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2837 srel
= htab
->srelplt
;
2839 srel
= htab
->srelgot
;
2841 BFD_ASSERT (srel
!= NULL
);
2844 _bfd_elf_section_offset (output_bfd
, info
,
2845 input_section
, rel
->r_offset
);
2847 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2848 memset (&outrel
, 0, sizeof outrel
);
2851 outrel
.r_offset
+= (input_section
->output_section
->vma
2852 + input_section
->output_offset
);
2854 /* Complain if the relocation is in a read-only section
2855 and not in a literal pool. */
2856 if ((input_section
->flags
& SEC_READONLY
) != 0
2857 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2861 _("dynamic relocation in read-only section");
2862 (*info
->callbacks
->reloc_dangerous
)
2863 (info
, error_message
,
2864 input_bfd
, input_section
, rel
->r_offset
);
2869 outrel
.r_addend
= rel
->r_addend
;
2872 if (r_type
== R_XTENSA_32
)
2875 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2878 else /* r_type == R_XTENSA_PLT */
2881 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2883 /* Create the PLT entry and set the initial
2884 contents of the literal entry to the address of
2887 elf_xtensa_create_plt_entry (info
, output_bfd
,
2890 unresolved_reloc
= FALSE
;
2894 /* Generate a RELATIVE relocation. */
2895 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2896 outrel
.r_addend
= 0;
2900 loc
= (srel
->contents
2901 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2902 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2903 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2906 else if (r_type
== R_XTENSA_ASM_EXPAND
&& dynamic_symbol
)
2908 /* This should only happen for non-PIC code, which is not
2909 supposed to be used on systems with dynamic linking.
2910 Just ignore these relocations. */
2915 case R_XTENSA_TLS_TPOFF
:
2916 /* Switch to LE model for local symbols in an executable. */
2917 if (! bfd_link_pic (info
) && ! dynamic_symbol
)
2919 relocation
= tpoff (info
, relocation
);
2924 case R_XTENSA_TLSDESC_FN
:
2925 case R_XTENSA_TLSDESC_ARG
:
2927 if (r_type
== R_XTENSA_TLSDESC_FN
)
2929 if (! bfd_link_pic (info
) || (tls_type
& GOT_TLS_IE
) != 0)
2930 r_type
= R_XTENSA_NONE
;
2932 else if (r_type
== R_XTENSA_TLSDESC_ARG
)
2934 if (bfd_link_pic (info
))
2936 if ((tls_type
& GOT_TLS_IE
) != 0)
2937 r_type
= R_XTENSA_TLS_TPOFF
;
2941 r_type
= R_XTENSA_TLS_TPOFF
;
2942 if (! dynamic_symbol
)
2944 relocation
= tpoff (info
, relocation
);
2950 if (r_type
== R_XTENSA_NONE
)
2951 /* Nothing to do here; skip to the next reloc. */
2954 if (! elf_hash_table (info
)->dynamic_sections_created
)
2957 _("TLS relocation invalid without dynamic sections");
2958 (*info
->callbacks
->reloc_dangerous
)
2959 (info
, error_message
,
2960 input_bfd
, input_section
, rel
->r_offset
);
2964 Elf_Internal_Rela outrel
;
2966 asection
*srel
= htab
->srelgot
;
2969 outrel
.r_offset
= (input_section
->output_section
->vma
2970 + input_section
->output_offset
2973 /* Complain if the relocation is in a read-only section
2974 and not in a literal pool. */
2975 if ((input_section
->flags
& SEC_READONLY
) != 0
2976 && ! elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2980 _("dynamic relocation in read-only section");
2981 (*info
->callbacks
->reloc_dangerous
)
2982 (info
, error_message
,
2983 input_bfd
, input_section
, rel
->r_offset
);
2986 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
2988 outrel
.r_addend
= relocation
- dtpoff_base (info
);
2990 outrel
.r_addend
= 0;
2993 outrel
.r_info
= ELF32_R_INFO (indx
, r_type
);
2995 unresolved_reloc
= FALSE
;
2998 loc
= (srel
->contents
2999 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
3000 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
3001 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
3007 case R_XTENSA_TLS_DTPOFF
:
3008 if (! bfd_link_pic (info
))
3009 /* Switch from LD model to LE model. */
3010 relocation
= tpoff (info
, relocation
);
3012 relocation
-= dtpoff_base (info
);
3015 case R_XTENSA_TLS_FUNC
:
3016 case R_XTENSA_TLS_ARG
:
3017 case R_XTENSA_TLS_CALL
:
3018 /* Check if optimizing to IE or LE model. */
3019 if ((tls_type
& GOT_TLS_IE
) != 0)
3021 bfd_boolean is_ld_model
=
3022 (h
&& elf_xtensa_hash_entry (h
) == htab
->tlsbase
);
3023 if (! replace_tls_insn (rel
, input_bfd
, input_section
, contents
,
3024 is_ld_model
, &error_message
))
3025 (*info
->callbacks
->reloc_dangerous
)
3026 (info
, error_message
,
3027 input_bfd
, input_section
, rel
->r_offset
);
3029 if (r_type
!= R_XTENSA_TLS_ARG
|| is_ld_model
)
3031 /* Skip subsequent relocations on the same instruction. */
3032 while (rel
+ 1 < relend
&& rel
[1].r_offset
== rel
->r_offset
)
3039 if (elf_hash_table (info
)->dynamic_sections_created
3040 && dynamic_symbol
&& (is_operand_relocation (r_type
)
3041 || r_type
== R_XTENSA_32_PCREL
))
3044 vsprint_msg ("invalid relocation for dynamic symbol", ": %s",
3045 strlen (name
) + 2, name
);
3046 (*info
->callbacks
->reloc_dangerous
)
3047 (info
, error_message
, input_bfd
, input_section
, rel
->r_offset
);
3053 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3054 because such sections are not SEC_ALLOC and thus ld.so will
3055 not process them. */
3056 if (unresolved_reloc
3057 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
3059 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3060 rel
->r_offset
) != (bfd_vma
) -1)
3062 (*_bfd_error_handler
)
3063 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3066 (long) rel
->r_offset
,
3072 /* TLS optimizations may have changed r_type; update "howto". */
3073 howto
= &elf_howto_table
[r_type
];
3075 /* There's no point in calling bfd_perform_relocation here.
3076 Just go directly to our "special function". */
3077 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
3078 relocation
+ rel
->r_addend
,
3079 contents
, rel
->r_offset
, is_weak_undef
,
3082 if (r
!= bfd_reloc_ok
&& !warned
)
3084 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
3085 BFD_ASSERT (error_message
!= NULL
);
3087 if (rel
->r_addend
== 0)
3088 error_message
= vsprint_msg (error_message
, ": %s",
3089 strlen (name
) + 2, name
);
3091 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
3093 name
, (int) rel
->r_addend
);
3095 (*info
->callbacks
->reloc_dangerous
)
3096 (info
, error_message
, input_bfd
, input_section
, rel
->r_offset
);
3103 input_section
->reloc_done
= TRUE
;
3109 /* Finish up dynamic symbol handling. There's not much to do here since
3110 the PLT and GOT entries are all set up by relocate_section. */
3113 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
3114 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3115 struct elf_link_hash_entry
*h
,
3116 Elf_Internal_Sym
*sym
)
3118 if (h
->needs_plt
&& !h
->def_regular
)
3120 /* Mark the symbol as undefined, rather than as defined in
3121 the .plt section. Leave the value alone. */
3122 sym
->st_shndx
= SHN_UNDEF
;
3123 /* If the symbol is weak, we do need to clear the value.
3124 Otherwise, the PLT entry would provide a definition for
3125 the symbol even if the symbol wasn't defined anywhere,
3126 and so the symbol would never be NULL. */
3127 if (!h
->ref_regular_nonweak
)
3131 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3132 if (h
== elf_hash_table (info
)->hdynamic
3133 || h
== elf_hash_table (info
)->hgot
)
3134 sym
->st_shndx
= SHN_ABS
;
3140 /* Combine adjacent literal table entries in the output. Adjacent
3141 entries within each input section may have been removed during
3142 relaxation, but we repeat the process here, even though it's too late
3143 to shrink the output section, because it's important to minimize the
3144 number of literal table entries to reduce the start-up work for the
3145 runtime linker. Returns the number of remaining table entries or -1
3149 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
3154 property_table_entry
*table
;
3155 bfd_size_type section_size
, sgotloc_size
;
3159 section_size
= sxtlit
->size
;
3160 BFD_ASSERT (section_size
% 8 == 0);
3161 num
= section_size
/ 8;
3163 sgotloc_size
= sgotloc
->size
;
3164 if (sgotloc_size
!= section_size
)
3166 (*_bfd_error_handler
)
3167 (_("internal inconsistency in size of .got.loc section"));
3171 table
= bfd_malloc (num
* sizeof (property_table_entry
));
3175 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
3176 propagates to the output section, where it doesn't really apply and
3177 where it breaks the following call to bfd_malloc_and_get_section. */
3178 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
3180 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
3188 /* There should never be any relocations left at this point, so this
3189 is quite a bit easier than what is done during relaxation. */
3191 /* Copy the raw contents into a property table array and sort it. */
3193 for (n
= 0; n
< num
; n
++)
3195 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
3196 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
3199 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
3201 for (n
= 0; n
< num
; n
++)
3203 bfd_boolean remove_entry
= FALSE
;
3205 if (table
[n
].size
== 0)
3206 remove_entry
= TRUE
;
3208 && (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
3210 table
[n
-1].size
+= table
[n
].size
;
3211 remove_entry
= TRUE
;
3216 for (m
= n
; m
< num
- 1; m
++)
3218 table
[m
].address
= table
[m
+1].address
;
3219 table
[m
].size
= table
[m
+1].size
;
3227 /* Copy the data back to the raw contents. */
3229 for (n
= 0; n
< num
; n
++)
3231 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
3232 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
3236 /* Clear the removed bytes. */
3237 if ((bfd_size_type
) (num
* 8) < section_size
)
3238 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
3240 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
3244 /* Copy the contents to ".got.loc". */
3245 memcpy (sgotloc
->contents
, contents
, section_size
);
3253 /* Finish up the dynamic sections. */
3256 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
3257 struct bfd_link_info
*info
)
3259 struct elf_xtensa_link_hash_table
*htab
;
3261 asection
*sdyn
, *srelplt
, *sgot
, *sxtlit
, *sgotloc
;
3262 Elf32_External_Dyn
*dyncon
, *dynconend
;
3263 int num_xtlit_entries
= 0;
3265 if (! elf_hash_table (info
)->dynamic_sections_created
)
3268 htab
= elf_xtensa_hash_table (info
);
3272 dynobj
= elf_hash_table (info
)->dynobj
;
3273 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3274 BFD_ASSERT (sdyn
!= NULL
);
3276 /* Set the first entry in the global offset table to the address of
3277 the dynamic section. */
3281 BFD_ASSERT (sgot
->size
== 4);
3283 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
3285 bfd_put_32 (output_bfd
,
3286 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3290 srelplt
= htab
->srelplt
;
3291 if (srelplt
&& srelplt
->size
!= 0)
3293 asection
*sgotplt
, *srelgot
, *spltlittbl
;
3294 int chunk
, plt_chunks
, plt_entries
;
3295 Elf_Internal_Rela irela
;
3297 unsigned rtld_reloc
;
3299 srelgot
= htab
->srelgot
;
3300 spltlittbl
= htab
->spltlittbl
;
3301 BFD_ASSERT (srelgot
!= NULL
&& spltlittbl
!= NULL
);
3303 /* Find the first XTENSA_RTLD relocation. Presumably the rest
3304 of them follow immediately after.... */
3305 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
3307 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
3308 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3309 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
3312 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
3314 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
3316 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
3318 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
3320 int chunk_entries
= 0;
3322 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
3323 BFD_ASSERT (sgotplt
!= NULL
);
3325 /* Emit special RTLD relocations for the first two entries in
3326 each chunk of the .got.plt section. */
3328 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
3329 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3330 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
3331 irela
.r_offset
= (sgotplt
->output_section
->vma
3332 + sgotplt
->output_offset
);
3333 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
3334 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
3336 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
3338 /* Next literal immediately follows the first. */
3339 loc
+= sizeof (Elf32_External_Rela
);
3340 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
3341 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
3342 irela
.r_offset
= (sgotplt
->output_section
->vma
3343 + sgotplt
->output_offset
+ 4);
3344 /* Tell rtld to set value to object's link map. */
3346 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
3348 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
3350 /* Fill in the literal table. */
3351 if (chunk
< plt_chunks
- 1)
3352 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
3354 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
3356 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
3357 bfd_put_32 (output_bfd
,
3358 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
3359 spltlittbl
->contents
+ (chunk
* 8) + 0);
3360 bfd_put_32 (output_bfd
,
3361 8 + (chunk_entries
* 4),
3362 spltlittbl
->contents
+ (chunk
* 8) + 4);
3365 /* All the dynamic relocations have been emitted at this point.
3366 Make sure the relocation sections are the correct size. */
3367 if (srelgot
->size
!= (sizeof (Elf32_External_Rela
)
3368 * srelgot
->reloc_count
)
3369 || srelplt
->size
!= (sizeof (Elf32_External_Rela
)
3370 * srelplt
->reloc_count
))
3373 /* The .xt.lit.plt section has just been modified. This must
3374 happen before the code below which combines adjacent literal
3375 table entries, and the .xt.lit.plt contents have to be forced to
3377 if (! bfd_set_section_contents (output_bfd
,
3378 spltlittbl
->output_section
,
3379 spltlittbl
->contents
,
3380 spltlittbl
->output_offset
,
3383 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
3384 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
3387 /* Combine adjacent literal table entries. */
3388 BFD_ASSERT (! bfd_link_relocatable (info
));
3389 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
3390 sgotloc
= htab
->sgotloc
;
3391 BFD_ASSERT (sgotloc
);
3395 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
3396 if (num_xtlit_entries
< 0)
3400 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3401 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
3402 for (; dyncon
< dynconend
; dyncon
++)
3404 Elf_Internal_Dyn dyn
;
3406 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3413 case DT_XTENSA_GOT_LOC_SZ
:
3414 dyn
.d_un
.d_val
= num_xtlit_entries
;
3417 case DT_XTENSA_GOT_LOC_OFF
:
3418 dyn
.d_un
.d_ptr
= (htab
->sgotloc
->output_section
->vma
3419 + htab
->sgotloc
->output_offset
);
3423 dyn
.d_un
.d_ptr
= (htab
->sgot
->output_section
->vma
3424 + htab
->sgot
->output_offset
);
3428 dyn
.d_un
.d_ptr
= (htab
->srelplt
->output_section
->vma
3429 + htab
->srelplt
->output_offset
);
3433 dyn
.d_un
.d_val
= htab
->srelplt
->size
;
3437 /* Adjust RELASZ to not include JMPREL. This matches what
3438 glibc expects and what is done for several other ELF
3439 targets (e.g., i386, alpha), but the "correct" behavior
3440 seems to be unresolved. Since the linker script arranges
3441 for .rela.plt to follow all other relocation sections, we
3442 don't have to worry about changing the DT_RELA entry. */
3444 dyn
.d_un
.d_val
-= htab
->srelplt
->size
;
3448 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3455 /* Functions for dealing with the e_flags field. */
3457 /* Merge backend specific data from an object file to the output
3458 object file when linking. */
3461 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
3463 unsigned out_mach
, in_mach
;
3464 flagword out_flag
, in_flag
;
3466 /* Check if we have the same endianness. */
3467 if (!_bfd_generic_verify_endian_match (ibfd
, obfd
))
3470 /* Don't even pretend to support mixed-format linking. */
3471 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
3472 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
3475 out_flag
= elf_elfheader (obfd
)->e_flags
;
3476 in_flag
= elf_elfheader (ibfd
)->e_flags
;
3478 out_mach
= out_flag
& EF_XTENSA_MACH
;
3479 in_mach
= in_flag
& EF_XTENSA_MACH
;
3480 if (out_mach
!= in_mach
)
3482 (*_bfd_error_handler
)
3483 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
3484 ibfd
, out_mach
, in_mach
);
3485 bfd_set_error (bfd_error_wrong_format
);
3489 if (! elf_flags_init (obfd
))
3491 elf_flags_init (obfd
) = TRUE
;
3492 elf_elfheader (obfd
)->e_flags
= in_flag
;
3494 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
3495 && bfd_get_arch_info (obfd
)->the_default
)
3496 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
3497 bfd_get_mach (ibfd
));
3502 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
3503 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
3505 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
3506 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
3513 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
3515 BFD_ASSERT (!elf_flags_init (abfd
)
3516 || elf_elfheader (abfd
)->e_flags
== flags
);
3518 elf_elfheader (abfd
)->e_flags
|= flags
;
3519 elf_flags_init (abfd
) = TRUE
;
3526 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
3528 FILE *f
= (FILE *) farg
;
3529 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
3531 fprintf (f
, "\nXtensa header:\n");
3532 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
3533 fprintf (f
, "\nMachine = Base\n");
3535 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
3537 fprintf (f
, "Insn tables = %s\n",
3538 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
3540 fprintf (f
, "Literal tables = %s\n",
3541 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
3543 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
3547 /* Set the right machine number for an Xtensa ELF file. */
3550 elf_xtensa_object_p (bfd
*abfd
)
3553 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
3558 mach
= bfd_mach_xtensa
;
3564 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
3569 /* The final processing done just before writing out an Xtensa ELF object
3570 file. This gets the Xtensa architecture right based on the machine
3574 elf_xtensa_final_write_processing (bfd
*abfd
,
3575 bfd_boolean linker ATTRIBUTE_UNUSED
)
3580 switch (mach
= bfd_get_mach (abfd
))
3582 case bfd_mach_xtensa
:
3583 val
= E_XTENSA_MACH
;
3589 elf_elfheader (abfd
)->e_flags
&= (~ EF_XTENSA_MACH
);
3590 elf_elfheader (abfd
)->e_flags
|= val
;
3594 static enum elf_reloc_type_class
3595 elf_xtensa_reloc_type_class (const struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3596 const asection
*rel_sec ATTRIBUTE_UNUSED
,
3597 const Elf_Internal_Rela
*rela
)
3599 switch ((int) ELF32_R_TYPE (rela
->r_info
))
3601 case R_XTENSA_RELATIVE
:
3602 return reloc_class_relative
;
3603 case R_XTENSA_JMP_SLOT
:
3604 return reloc_class_plt
;
3606 return reloc_class_normal
;
3612 elf_xtensa_discard_info_for_section (bfd
*abfd
,
3613 struct elf_reloc_cookie
*cookie
,
3614 struct bfd_link_info
*info
,
3618 bfd_vma offset
, actual_offset
;
3619 bfd_size_type removed_bytes
= 0;
3620 bfd_size_type entry_size
;
3622 if (sec
->output_section
3623 && bfd_is_abs_section (sec
->output_section
))
3626 if (xtensa_is_proptable_section (sec
))
3631 if (sec
->size
== 0 || sec
->size
% entry_size
!= 0)
3634 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
3638 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
3641 release_contents (sec
, contents
);
3645 /* Sort the relocations. They should already be in order when
3646 relaxation is enabled, but it might not be. */
3647 qsort (cookie
->rels
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
3648 internal_reloc_compare
);
3650 cookie
->rel
= cookie
->rels
;
3651 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
3653 for (offset
= 0; offset
< sec
->size
; offset
+= entry_size
)
3655 actual_offset
= offset
- removed_bytes
;
3657 /* The ...symbol_deleted_p function will skip over relocs but it
3658 won't adjust their offsets, so do that here. */
3659 while (cookie
->rel
< cookie
->relend
3660 && cookie
->rel
->r_offset
< offset
)
3662 cookie
->rel
->r_offset
-= removed_bytes
;
3666 while (cookie
->rel
< cookie
->relend
3667 && cookie
->rel
->r_offset
== offset
)
3669 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
3671 /* Remove the table entry. (If the reloc type is NONE, then
3672 the entry has already been merged with another and deleted
3673 during relaxation.) */
3674 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
3676 /* Shift the contents up. */
3677 if (offset
+ entry_size
< sec
->size
)
3678 memmove (&contents
[actual_offset
],
3679 &contents
[actual_offset
+ entry_size
],
3680 sec
->size
- offset
- entry_size
);
3681 removed_bytes
+= entry_size
;
3684 /* Remove this relocation. */
3685 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
3688 /* Adjust the relocation offset for previous removals. This
3689 should not be done before calling ...symbol_deleted_p
3690 because it might mess up the offset comparisons there.
3691 Make sure the offset doesn't underflow in the case where
3692 the first entry is removed. */
3693 if (cookie
->rel
->r_offset
>= removed_bytes
)
3694 cookie
->rel
->r_offset
-= removed_bytes
;
3696 cookie
->rel
->r_offset
= 0;
3702 if (removed_bytes
!= 0)
3704 /* Adjust any remaining relocs (shouldn't be any). */
3705 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
3707 if (cookie
->rel
->r_offset
>= removed_bytes
)
3708 cookie
->rel
->r_offset
-= removed_bytes
;
3710 cookie
->rel
->r_offset
= 0;
3713 /* Clear the removed bytes. */
3714 memset (&contents
[sec
->size
- removed_bytes
], 0, removed_bytes
);
3716 pin_contents (sec
, contents
);
3717 pin_internal_relocs (sec
, cookie
->rels
);
3720 if (sec
->rawsize
== 0)
3721 sec
->rawsize
= sec
->size
;
3722 sec
->size
-= removed_bytes
;
3724 if (xtensa_is_littable_section (sec
))
3726 asection
*sgotloc
= elf_xtensa_hash_table (info
)->sgotloc
;
3728 sgotloc
->size
-= removed_bytes
;
3733 release_contents (sec
, contents
);
3734 release_internal_relocs (sec
, cookie
->rels
);
3737 return (removed_bytes
!= 0);
3742 elf_xtensa_discard_info (bfd
*abfd
,
3743 struct elf_reloc_cookie
*cookie
,
3744 struct bfd_link_info
*info
)
3747 bfd_boolean changed
= FALSE
;
3749 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3751 if (xtensa_is_property_section (sec
))
3753 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
3763 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
3765 return xtensa_is_property_section (sec
);
3770 elf_xtensa_action_discarded (asection
*sec
)
3772 if (strcmp (".xt_except_table", sec
->name
) == 0)
3775 if (strcmp (".xt_except_desc", sec
->name
) == 0)
3778 return _bfd_elf_default_action_discarded (sec
);
3782 /* Support for core dump NOTE sections. */
3785 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
3790 /* The size for Xtensa is variable, so don't try to recognize the format
3791 based on the size. Just assume this is GNU/Linux. */
3794 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
3797 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
3801 size
= note
->descsz
- offset
- 4;
3803 /* Make a ".reg/999" section. */
3804 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
3805 size
, note
->descpos
+ offset
);
3810 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
3812 switch (note
->descsz
)
3817 case 128: /* GNU/Linux elf_prpsinfo */
3818 elf_tdata (abfd
)->core
->program
3819 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
3820 elf_tdata (abfd
)->core
->command
3821 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
3824 /* Note that for some reason, a spurious space is tacked
3825 onto the end of the args in some (at least one anyway)
3826 implementations, so strip it off if it exists. */
3829 char *command
= elf_tdata (abfd
)->core
->command
;
3830 int n
= strlen (command
);
3832 if (0 < n
&& command
[n
- 1] == ' ')
3833 command
[n
- 1] = '\0';
3840 /* Generic Xtensa configurability stuff. */
3842 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3843 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3844 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3845 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3846 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3847 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3848 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3849 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3852 init_call_opcodes (void)
3854 if (callx0_op
== XTENSA_UNDEFINED
)
3856 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3857 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3858 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3859 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3860 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3861 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3862 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3863 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3869 is_indirect_call_opcode (xtensa_opcode opcode
)
3871 init_call_opcodes ();
3872 return (opcode
== callx0_op
3873 || opcode
== callx4_op
3874 || opcode
== callx8_op
3875 || opcode
== callx12_op
);
3880 is_direct_call_opcode (xtensa_opcode opcode
)
3882 init_call_opcodes ();
3883 return (opcode
== call0_op
3884 || opcode
== call4_op
3885 || opcode
== call8_op
3886 || opcode
== call12_op
);
3891 is_windowed_call_opcode (xtensa_opcode opcode
)
3893 init_call_opcodes ();
3894 return (opcode
== call4_op
3895 || opcode
== call8_op
3896 || opcode
== call12_op
3897 || opcode
== callx4_op
3898 || opcode
== callx8_op
3899 || opcode
== callx12_op
);
3904 get_indirect_call_dest_reg (xtensa_opcode opcode
, unsigned *pdst
)
3906 unsigned dst
= (unsigned) -1;
3908 init_call_opcodes ();
3909 if (opcode
== callx0_op
)
3911 else if (opcode
== callx4_op
)
3913 else if (opcode
== callx8_op
)
3915 else if (opcode
== callx12_op
)
3918 if (dst
== (unsigned) -1)
3926 static xtensa_opcode
3927 get_const16_opcode (void)
3929 static bfd_boolean done_lookup
= FALSE
;
3930 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3933 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3936 return const16_opcode
;
3940 static xtensa_opcode
3941 get_l32r_opcode (void)
3943 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3944 static bfd_boolean done_lookup
= FALSE
;
3948 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3956 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3960 offset
= addr
- ((pc
+3) & -4);
3961 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3962 offset
= (signed int) offset
>> 2;
3963 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3969 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3971 xtensa_isa isa
= xtensa_default_isa
;
3972 int last_immed
, last_opnd
, opi
;
3974 if (opcode
== XTENSA_UNDEFINED
)
3975 return XTENSA_UNDEFINED
;
3977 /* Find the last visible PC-relative immediate operand for the opcode.
3978 If there are no PC-relative immediates, then choose the last visible
3979 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3980 last_immed
= XTENSA_UNDEFINED
;
3981 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3982 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3984 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3986 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3991 if (last_immed
== XTENSA_UNDEFINED
3992 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3996 return XTENSA_UNDEFINED
;
3998 /* If the operand number was specified in an old-style relocation,
3999 check for consistency with the operand computed above. */
4000 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
4002 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
4003 if (reloc_opnd
!= last_immed
)
4004 return XTENSA_UNDEFINED
;
4012 get_relocation_slot (int r_type
)
4022 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
4023 return r_type
- R_XTENSA_SLOT0_OP
;
4024 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
4025 return r_type
- R_XTENSA_SLOT0_ALT
;
4029 return XTENSA_UNDEFINED
;
4033 /* Get the opcode for a relocation. */
4035 static xtensa_opcode
4036 get_relocation_opcode (bfd
*abfd
,
4039 Elf_Internal_Rela
*irel
)
4041 static xtensa_insnbuf ibuff
= NULL
;
4042 static xtensa_insnbuf sbuff
= NULL
;
4043 xtensa_isa isa
= xtensa_default_isa
;
4047 if (contents
== NULL
)
4048 return XTENSA_UNDEFINED
;
4050 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
4051 return XTENSA_UNDEFINED
;
4055 ibuff
= xtensa_insnbuf_alloc (isa
);
4056 sbuff
= xtensa_insnbuf_alloc (isa
);
4059 /* Decode the instruction. */
4060 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
4061 sec
->size
- irel
->r_offset
);
4062 fmt
= xtensa_format_decode (isa
, ibuff
);
4063 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
4064 if (slot
== XTENSA_UNDEFINED
)
4065 return XTENSA_UNDEFINED
;
4066 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
4067 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
4072 is_l32r_relocation (bfd
*abfd
,
4075 Elf_Internal_Rela
*irel
)
4077 xtensa_opcode opcode
;
4078 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
4080 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
4081 return (opcode
== get_l32r_opcode ());
4085 static bfd_size_type
4086 get_asm_simplify_size (bfd_byte
*contents
,
4087 bfd_size_type content_len
,
4088 bfd_size_type offset
)
4090 bfd_size_type insnlen
, size
= 0;
4092 /* Decode the size of the next two instructions. */
4093 insnlen
= insn_decode_len (contents
, content_len
, offset
);
4099 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
4109 is_alt_relocation (int r_type
)
4111 return (r_type
>= R_XTENSA_SLOT0_ALT
4112 && r_type
<= R_XTENSA_SLOT14_ALT
);
4117 is_operand_relocation (int r_type
)
4127 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
4129 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
4138 #define MIN_INSN_LENGTH 2
4140 /* Return 0 if it fails to decode. */
4143 insn_decode_len (bfd_byte
*contents
,
4144 bfd_size_type content_len
,
4145 bfd_size_type offset
)
4148 xtensa_isa isa
= xtensa_default_isa
;
4150 static xtensa_insnbuf ibuff
= NULL
;
4152 if (offset
+ MIN_INSN_LENGTH
> content_len
)
4156 ibuff
= xtensa_insnbuf_alloc (isa
);
4157 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
4158 content_len
- offset
);
4159 fmt
= xtensa_format_decode (isa
, ibuff
);
4160 if (fmt
== XTENSA_UNDEFINED
)
4162 insn_len
= xtensa_format_length (isa
, fmt
);
4163 if (insn_len
== XTENSA_UNDEFINED
)
4169 /* Decode the opcode for a single slot instruction.
4170 Return 0 if it fails to decode or the instruction is multi-slot. */
4173 insn_decode_opcode (bfd_byte
*contents
,
4174 bfd_size_type content_len
,
4175 bfd_size_type offset
,
4178 xtensa_isa isa
= xtensa_default_isa
;
4180 static xtensa_insnbuf insnbuf
= NULL
;
4181 static xtensa_insnbuf slotbuf
= NULL
;
4183 if (offset
+ MIN_INSN_LENGTH
> content_len
)
4184 return XTENSA_UNDEFINED
;
4186 if (insnbuf
== NULL
)
4188 insnbuf
= xtensa_insnbuf_alloc (isa
);
4189 slotbuf
= xtensa_insnbuf_alloc (isa
);
4192 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4193 content_len
- offset
);
4194 fmt
= xtensa_format_decode (isa
, insnbuf
);
4195 if (fmt
== XTENSA_UNDEFINED
)
4196 return XTENSA_UNDEFINED
;
4198 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
4199 return XTENSA_UNDEFINED
;
4201 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
4202 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
4206 /* The offset is the offset in the contents.
4207 The address is the address of that offset. */
4210 check_branch_target_aligned (bfd_byte
*contents
,
4211 bfd_size_type content_length
,
4215 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
4218 return check_branch_target_aligned_address (address
, insn_len
);
4223 check_loop_aligned (bfd_byte
*contents
,
4224 bfd_size_type content_length
,
4228 bfd_size_type loop_len
, insn_len
;
4229 xtensa_opcode opcode
;
4231 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
4232 if (opcode
== XTENSA_UNDEFINED
4233 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
4239 loop_len
= insn_decode_len (contents
, content_length
, offset
);
4240 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
4241 if (loop_len
== 0 || insn_len
== 0)
4247 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
4252 check_branch_target_aligned_address (bfd_vma addr
, int len
)
4255 return (addr
% 8 == 0);
4256 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
4260 /* Instruction widening and narrowing. */
4262 /* When FLIX is available we need to access certain instructions only
4263 when they are 16-bit or 24-bit instructions. This table caches
4264 information about such instructions by walking through all the
4265 opcodes and finding the smallest single-slot format into which each
4268 static xtensa_format
*op_single_fmt_table
= NULL
;
4272 init_op_single_format_table (void)
4274 xtensa_isa isa
= xtensa_default_isa
;
4275 xtensa_insnbuf ibuf
;
4276 xtensa_opcode opcode
;
4280 if (op_single_fmt_table
)
4283 ibuf
= xtensa_insnbuf_alloc (isa
);
4284 num_opcodes
= xtensa_isa_num_opcodes (isa
);
4286 op_single_fmt_table
= (xtensa_format
*)
4287 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
4288 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
4290 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
4291 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
4293 if (xtensa_format_num_slots (isa
, fmt
) == 1
4294 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
4296 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
4297 int fmt_length
= xtensa_format_length (isa
, fmt
);
4298 if (old_fmt
== XTENSA_UNDEFINED
4299 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
4300 op_single_fmt_table
[opcode
] = fmt
;
4304 xtensa_insnbuf_free (isa
, ibuf
);
4308 static xtensa_format
4309 get_single_format (xtensa_opcode opcode
)
4311 init_op_single_format_table ();
4312 return op_single_fmt_table
[opcode
];
4316 /* For the set of narrowable instructions we do NOT include the
4317 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
4318 involved during linker relaxation that may require these to
4319 re-expand in some conditions. Also, the narrowing "or" -> mov.n
4320 requires special case code to ensure it only works when op1 == op2. */
4328 struct string_pair narrowable
[] =
4331 { "addi", "addi.n" },
4332 { "addmi", "addi.n" },
4333 { "l32i", "l32i.n" },
4334 { "movi", "movi.n" },
4336 { "retw", "retw.n" },
4337 { "s32i", "s32i.n" },
4338 { "or", "mov.n" } /* special case only when op1 == op2 */
4341 struct string_pair widenable
[] =
4344 { "addi", "addi.n" },
4345 { "addmi", "addi.n" },
4346 { "beqz", "beqz.n" },
4347 { "bnez", "bnez.n" },
4348 { "l32i", "l32i.n" },
4349 { "movi", "movi.n" },
4351 { "retw", "retw.n" },
4352 { "s32i", "s32i.n" },
4353 { "or", "mov.n" } /* special case only when op1 == op2 */
4357 /* Check if an instruction can be "narrowed", i.e., changed from a standard
4358 3-byte instruction to a 2-byte "density" instruction. If it is valid,
4359 return the instruction buffer holding the narrow instruction. Otherwise,
4360 return 0. The set of valid narrowing are specified by a string table
4361 but require some special case operand checks in some cases. */
4363 static xtensa_insnbuf
4364 can_narrow_instruction (xtensa_insnbuf slotbuf
,
4366 xtensa_opcode opcode
)
4368 xtensa_isa isa
= xtensa_default_isa
;
4369 xtensa_format o_fmt
;
4372 static xtensa_insnbuf o_insnbuf
= NULL
;
4373 static xtensa_insnbuf o_slotbuf
= NULL
;
4375 if (o_insnbuf
== NULL
)
4377 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
4378 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
4381 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
4383 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
4385 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
4387 uint32 value
, newval
;
4388 int i
, operand_count
, o_operand_count
;
4389 xtensa_opcode o_opcode
;
4391 /* Address does not matter in this case. We might need to
4392 fix it to handle branches/jumps. */
4393 bfd_vma self_address
= 0;
4395 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
4396 if (o_opcode
== XTENSA_UNDEFINED
)
4398 o_fmt
= get_single_format (o_opcode
);
4399 if (o_fmt
== XTENSA_UNDEFINED
)
4402 if (xtensa_format_length (isa
, fmt
) != 3
4403 || xtensa_format_length (isa
, o_fmt
) != 2)
4406 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
4407 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
4408 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
4410 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
4415 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
4420 uint32 rawval0
, rawval1
, rawval2
;
4422 if (o_operand_count
+ 1 != operand_count
4423 || xtensa_operand_get_field (isa
, opcode
, 0,
4424 fmt
, 0, slotbuf
, &rawval0
) != 0
4425 || xtensa_operand_get_field (isa
, opcode
, 1,
4426 fmt
, 0, slotbuf
, &rawval1
) != 0
4427 || xtensa_operand_get_field (isa
, opcode
, 2,
4428 fmt
, 0, slotbuf
, &rawval2
) != 0
4429 || rawval1
!= rawval2
4430 || rawval0
== rawval1
/* it is a nop */)
4434 for (i
= 0; i
< o_operand_count
; ++i
)
4436 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
4438 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
4441 /* PC-relative branches need adjustment, but
4442 the PC-rel operand will always have a relocation. */
4444 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
4446 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
4447 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
4452 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
4462 /* Attempt to narrow an instruction. If the narrowing is valid, perform
4463 the action in-place directly into the contents and return TRUE. Otherwise,
4464 the return value is FALSE and the contents are not modified. */
4467 narrow_instruction (bfd_byte
*contents
,
4468 bfd_size_type content_length
,
4469 bfd_size_type offset
)
4471 xtensa_opcode opcode
;
4472 bfd_size_type insn_len
;
4473 xtensa_isa isa
= xtensa_default_isa
;
4475 xtensa_insnbuf o_insnbuf
;
4477 static xtensa_insnbuf insnbuf
= NULL
;
4478 static xtensa_insnbuf slotbuf
= NULL
;
4480 if (insnbuf
== NULL
)
4482 insnbuf
= xtensa_insnbuf_alloc (isa
);
4483 slotbuf
= xtensa_insnbuf_alloc (isa
);
4486 BFD_ASSERT (offset
< content_length
);
4488 if (content_length
< 2)
4491 /* We will hand-code a few of these for a little while.
4492 These have all been specified in the assembler aleady. */
4493 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4494 content_length
- offset
);
4495 fmt
= xtensa_format_decode (isa
, insnbuf
);
4496 if (xtensa_format_num_slots (isa
, fmt
) != 1)
4499 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
4502 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4503 if (opcode
== XTENSA_UNDEFINED
)
4505 insn_len
= xtensa_format_length (isa
, fmt
);
4506 if (insn_len
> content_length
)
4509 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
4512 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
4513 content_length
- offset
);
4521 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
4522 "density" instruction to a standard 3-byte instruction. If it is valid,
4523 return the instruction buffer holding the wide instruction. Otherwise,
4524 return 0. The set of valid widenings are specified by a string table
4525 but require some special case operand checks in some cases. */
4527 static xtensa_insnbuf
4528 can_widen_instruction (xtensa_insnbuf slotbuf
,
4530 xtensa_opcode opcode
)
4532 xtensa_isa isa
= xtensa_default_isa
;
4533 xtensa_format o_fmt
;
4536 static xtensa_insnbuf o_insnbuf
= NULL
;
4537 static xtensa_insnbuf o_slotbuf
= NULL
;
4539 if (o_insnbuf
== NULL
)
4541 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
4542 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
4545 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
4547 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
4548 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
4549 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
4551 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
4553 uint32 value
, newval
;
4554 int i
, operand_count
, o_operand_count
, check_operand_count
;
4555 xtensa_opcode o_opcode
;
4557 /* Address does not matter in this case. We might need to fix it
4558 to handle branches/jumps. */
4559 bfd_vma self_address
= 0;
4561 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
4562 if (o_opcode
== XTENSA_UNDEFINED
)
4564 o_fmt
= get_single_format (o_opcode
);
4565 if (o_fmt
== XTENSA_UNDEFINED
)
4568 if (xtensa_format_length (isa
, fmt
) != 2
4569 || xtensa_format_length (isa
, o_fmt
) != 3)
4572 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
4573 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
4574 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
4575 check_operand_count
= o_operand_count
;
4577 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
4582 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
4587 uint32 rawval0
, rawval1
;
4589 if (o_operand_count
!= operand_count
+ 1
4590 || xtensa_operand_get_field (isa
, opcode
, 0,
4591 fmt
, 0, slotbuf
, &rawval0
) != 0
4592 || xtensa_operand_get_field (isa
, opcode
, 1,
4593 fmt
, 0, slotbuf
, &rawval1
) != 0
4594 || rawval0
== rawval1
/* it is a nop */)
4598 check_operand_count
--;
4600 for (i
= 0; i
< check_operand_count
; i
++)
4603 if (is_or
&& i
== o_operand_count
- 1)
4605 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
4607 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
4610 /* PC-relative branches need adjustment, but
4611 the PC-rel operand will always have a relocation. */
4613 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
4615 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
4616 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
4621 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
4631 /* Attempt to widen an instruction. If the widening is valid, perform
4632 the action in-place directly into the contents and return TRUE. Otherwise,
4633 the return value is FALSE and the contents are not modified. */
4636 widen_instruction (bfd_byte
*contents
,
4637 bfd_size_type content_length
,
4638 bfd_size_type offset
)
4640 xtensa_opcode opcode
;
4641 bfd_size_type insn_len
;
4642 xtensa_isa isa
= xtensa_default_isa
;
4644 xtensa_insnbuf o_insnbuf
;
4646 static xtensa_insnbuf insnbuf
= NULL
;
4647 static xtensa_insnbuf slotbuf
= NULL
;
4649 if (insnbuf
== NULL
)
4651 insnbuf
= xtensa_insnbuf_alloc (isa
);
4652 slotbuf
= xtensa_insnbuf_alloc (isa
);
4655 BFD_ASSERT (offset
< content_length
);
4657 if (content_length
< 2)
4660 /* We will hand-code a few of these for a little while.
4661 These have all been specified in the assembler aleady. */
4662 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
4663 content_length
- offset
);
4664 fmt
= xtensa_format_decode (isa
, insnbuf
);
4665 if (xtensa_format_num_slots (isa
, fmt
) != 1)
4668 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
4671 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4672 if (opcode
== XTENSA_UNDEFINED
)
4674 insn_len
= xtensa_format_length (isa
, fmt
);
4675 if (insn_len
> content_length
)
4678 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
4681 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
4682 content_length
- offset
);
4689 /* Code for transforming CALLs at link-time. */
4691 static bfd_reloc_status_type
4692 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
4694 bfd_vma content_length
,
4695 char **error_message
)
4697 static xtensa_insnbuf insnbuf
= NULL
;
4698 static xtensa_insnbuf slotbuf
= NULL
;
4699 xtensa_format core_format
= XTENSA_UNDEFINED
;
4700 xtensa_opcode opcode
;
4701 xtensa_opcode direct_call_opcode
;
4702 xtensa_isa isa
= xtensa_default_isa
;
4703 bfd_byte
*chbuf
= contents
+ address
;
4706 if (insnbuf
== NULL
)
4708 insnbuf
= xtensa_insnbuf_alloc (isa
);
4709 slotbuf
= xtensa_insnbuf_alloc (isa
);
4712 if (content_length
< address
)
4714 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
4715 return bfd_reloc_other
;
4718 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
4719 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
4720 if (direct_call_opcode
== XTENSA_UNDEFINED
)
4722 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
4723 return bfd_reloc_other
;
4726 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
4727 core_format
= xtensa_format_lookup (isa
, "x24");
4728 opcode
= xtensa_opcode_lookup (isa
, "or");
4729 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
4730 for (opn
= 0; opn
< 3; opn
++)
4733 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
4734 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
4737 xtensa_format_encode (isa
, core_format
, insnbuf
);
4738 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
4739 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
4741 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
4742 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
4743 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
4745 xtensa_format_encode (isa
, core_format
, insnbuf
);
4746 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
4747 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
4748 content_length
- address
- 3);
4750 return bfd_reloc_ok
;
4754 static bfd_reloc_status_type
4755 contract_asm_expansion (bfd_byte
*contents
,
4756 bfd_vma content_length
,
4757 Elf_Internal_Rela
*irel
,
4758 char **error_message
)
4760 bfd_reloc_status_type retval
=
4761 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
4764 if (retval
!= bfd_reloc_ok
)
4765 return bfd_reloc_dangerous
;
4767 /* Update the irel->r_offset field so that the right immediate and
4768 the right instruction are modified during the relocation. */
4769 irel
->r_offset
+= 3;
4770 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
4771 return bfd_reloc_ok
;
4775 static xtensa_opcode
4776 swap_callx_for_call_opcode (xtensa_opcode opcode
)
4778 init_call_opcodes ();
4780 if (opcode
== callx0_op
) return call0_op
;
4781 if (opcode
== callx4_op
) return call4_op
;
4782 if (opcode
== callx8_op
) return call8_op
;
4783 if (opcode
== callx12_op
) return call12_op
;
4785 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
4786 return XTENSA_UNDEFINED
;
4790 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
4791 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
4792 If not, return XTENSA_UNDEFINED. */
4794 #define L32R_TARGET_REG_OPERAND 0
4795 #define CONST16_TARGET_REG_OPERAND 0
4796 #define CALLN_SOURCE_OPERAND 0
4798 static xtensa_opcode
4799 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
4801 static xtensa_insnbuf insnbuf
= NULL
;
4802 static xtensa_insnbuf slotbuf
= NULL
;
4804 xtensa_opcode opcode
;
4805 xtensa_isa isa
= xtensa_default_isa
;
4806 uint32 regno
, const16_regno
, call_regno
;
4809 if (insnbuf
== NULL
)
4811 insnbuf
= xtensa_insnbuf_alloc (isa
);
4812 slotbuf
= xtensa_insnbuf_alloc (isa
);
4815 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
4816 fmt
= xtensa_format_decode (isa
, insnbuf
);
4817 if (fmt
== XTENSA_UNDEFINED
4818 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4819 return XTENSA_UNDEFINED
;
4821 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4822 if (opcode
== XTENSA_UNDEFINED
)
4823 return XTENSA_UNDEFINED
;
4825 if (opcode
== get_l32r_opcode ())
4828 *p_uses_l32r
= TRUE
;
4829 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4830 fmt
, 0, slotbuf
, ®no
)
4831 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4833 return XTENSA_UNDEFINED
;
4835 else if (opcode
== get_const16_opcode ())
4838 *p_uses_l32r
= FALSE
;
4839 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4840 fmt
, 0, slotbuf
, ®no
)
4841 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4843 return XTENSA_UNDEFINED
;
4845 /* Check that the next instruction is also CONST16. */
4846 offset
+= xtensa_format_length (isa
, fmt
);
4847 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4848 fmt
= xtensa_format_decode (isa
, insnbuf
);
4849 if (fmt
== XTENSA_UNDEFINED
4850 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4851 return XTENSA_UNDEFINED
;
4852 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4853 if (opcode
!= get_const16_opcode ())
4854 return XTENSA_UNDEFINED
;
4856 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4857 fmt
, 0, slotbuf
, &const16_regno
)
4858 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4860 || const16_regno
!= regno
)
4861 return XTENSA_UNDEFINED
;
4864 return XTENSA_UNDEFINED
;
4866 /* Next instruction should be an CALLXn with operand 0 == regno. */
4867 offset
+= xtensa_format_length (isa
, fmt
);
4868 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4869 fmt
= xtensa_format_decode (isa
, insnbuf
);
4870 if (fmt
== XTENSA_UNDEFINED
4871 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4872 return XTENSA_UNDEFINED
;
4873 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4874 if (opcode
== XTENSA_UNDEFINED
4875 || !is_indirect_call_opcode (opcode
))
4876 return XTENSA_UNDEFINED
;
4878 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4879 fmt
, 0, slotbuf
, &call_regno
)
4880 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4882 return XTENSA_UNDEFINED
;
4884 if (call_regno
!= regno
)
4885 return XTENSA_UNDEFINED
;
4891 /* Data structures used during relaxation. */
4893 /* r_reloc: relocation values. */
4895 /* Through the relaxation process, we need to keep track of the values
4896 that will result from evaluating relocations. The standard ELF
4897 relocation structure is not sufficient for this purpose because we're
4898 operating on multiple input files at once, so we need to know which
4899 input file a relocation refers to. The r_reloc structure thus
4900 records both the input file (bfd) and ELF relocation.
4902 For efficiency, an r_reloc also contains a "target_offset" field to
4903 cache the target-section-relative offset value that is represented by
4906 The r_reloc also contains a virtual offset that allows multiple
4907 inserted literals to be placed at the same "address" with
4908 different offsets. */
4910 typedef struct r_reloc_struct r_reloc
;
4912 struct r_reloc_struct
4915 Elf_Internal_Rela rela
;
4916 bfd_vma target_offset
;
4917 bfd_vma virtual_offset
;
4921 /* The r_reloc structure is included by value in literal_value, but not
4922 every literal_value has an associated relocation -- some are simple
4923 constants. In such cases, we set all the fields in the r_reloc
4924 struct to zero. The r_reloc_is_const function should be used to
4925 detect this case. */
4928 r_reloc_is_const (const r_reloc
*r_rel
)
4930 return (r_rel
->abfd
== NULL
);
4935 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4937 bfd_vma target_offset
;
4938 unsigned long r_symndx
;
4940 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4941 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4942 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4943 return (target_offset
+ r_rel
->rela
.r_addend
);
4947 static struct elf_link_hash_entry
*
4948 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4950 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4951 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4956 r_reloc_get_section (const r_reloc
*r_rel
)
4958 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4959 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4964 r_reloc_is_defined (const r_reloc
*r_rel
)
4970 sec
= r_reloc_get_section (r_rel
);
4971 if (sec
== bfd_abs_section_ptr
4972 || sec
== bfd_com_section_ptr
4973 || sec
== bfd_und_section_ptr
)
4980 r_reloc_init (r_reloc
*r_rel
,
4982 Elf_Internal_Rela
*irel
,
4984 bfd_size_type content_length
)
4987 reloc_howto_type
*howto
;
4991 r_rel
->rela
= *irel
;
4993 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4994 r_rel
->virtual_offset
= 0;
4995 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4996 howto
= &elf_howto_table
[r_type
];
4997 if (howto
->partial_inplace
)
4999 bfd_vma inplace_val
;
5000 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
5002 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
5003 r_rel
->target_offset
+= inplace_val
;
5007 memset (r_rel
, 0, sizeof (r_reloc
));
5014 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
5016 if (r_reloc_is_defined (r_rel
))
5018 asection
*sec
= r_reloc_get_section (r_rel
);
5019 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
5021 else if (r_reloc_get_hash_entry (r_rel
))
5022 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
5024 fprintf (fp
, " ?? + ");
5026 fprintf_vma (fp
, r_rel
->target_offset
);
5027 if (r_rel
->virtual_offset
)
5029 fprintf (fp
, " + ");
5030 fprintf_vma (fp
, r_rel
->virtual_offset
);
5039 /* source_reloc: relocations that reference literals. */
5041 /* To determine whether literals can be coalesced, we need to first
5042 record all the relocations that reference the literals. The
5043 source_reloc structure below is used for this purpose. The
5044 source_reloc entries are kept in a per-literal-section array, sorted
5045 by offset within the literal section (i.e., target offset).
5047 The source_sec and r_rel.rela.r_offset fields identify the source of
5048 the relocation. The r_rel field records the relocation value, i.e.,
5049 the offset of the literal being referenced. The opnd field is needed
5050 to determine the range of the immediate field to which the relocation
5051 applies, so we can determine whether another literal with the same
5052 value is within range. The is_null field is true when the relocation
5053 is being removed (e.g., when an L32R is being removed due to a CALLX
5054 that is converted to a direct CALL). */
5056 typedef struct source_reloc_struct source_reloc
;
5058 struct source_reloc_struct
5060 asection
*source_sec
;
5062 xtensa_opcode opcode
;
5064 bfd_boolean is_null
;
5065 bfd_boolean is_abs_literal
;
5070 init_source_reloc (source_reloc
*reloc
,
5071 asection
*source_sec
,
5072 const r_reloc
*r_rel
,
5073 xtensa_opcode opcode
,
5075 bfd_boolean is_abs_literal
)
5077 reloc
->source_sec
= source_sec
;
5078 reloc
->r_rel
= *r_rel
;
5079 reloc
->opcode
= opcode
;
5081 reloc
->is_null
= FALSE
;
5082 reloc
->is_abs_literal
= is_abs_literal
;
5086 /* Find the source_reloc for a particular source offset and relocation
5087 type. Note that the array is sorted by _target_ offset, so this is
5088 just a linear search. */
5090 static source_reloc
*
5091 find_source_reloc (source_reloc
*src_relocs
,
5094 Elf_Internal_Rela
*irel
)
5098 for (i
= 0; i
< src_count
; i
++)
5100 if (src_relocs
[i
].source_sec
== sec
5101 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
5102 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
5103 == ELF32_R_TYPE (irel
->r_info
)))
5104 return &src_relocs
[i
];
5112 source_reloc_compare (const void *ap
, const void *bp
)
5114 const source_reloc
*a
= (const source_reloc
*) ap
;
5115 const source_reloc
*b
= (const source_reloc
*) bp
;
5117 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
5118 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
5120 /* We don't need to sort on these criteria for correctness,
5121 but enforcing a more strict ordering prevents unstable qsort
5122 from behaving differently with different implementations.
5123 Without the code below we get correct but different results
5124 on Solaris 2.7 and 2.8. We would like to always produce the
5125 same results no matter the host. */
5127 if ((!a
->is_null
) - (!b
->is_null
))
5128 return ((!a
->is_null
) - (!b
->is_null
));
5129 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
5133 /* Literal values and value hash tables. */
5135 /* Literals with the same value can be coalesced. The literal_value
5136 structure records the value of a literal: the "r_rel" field holds the
5137 information from the relocation on the literal (if there is one) and
5138 the "value" field holds the contents of the literal word itself.
5140 The value_map structure records a literal value along with the
5141 location of a literal holding that value. The value_map hash table
5142 is indexed by the literal value, so that we can quickly check if a
5143 particular literal value has been seen before and is thus a candidate
5146 typedef struct literal_value_struct literal_value
;
5147 typedef struct value_map_struct value_map
;
5148 typedef struct value_map_hash_table_struct value_map_hash_table
;
5150 struct literal_value_struct
5153 unsigned long value
;
5154 bfd_boolean is_abs_literal
;
5157 struct value_map_struct
5159 literal_value val
; /* The literal value. */
5160 r_reloc loc
; /* Location of the literal. */
5164 struct value_map_hash_table_struct
5166 unsigned bucket_count
;
5167 value_map
**buckets
;
5169 bfd_boolean has_last_loc
;
5175 init_literal_value (literal_value
*lit
,
5176 const r_reloc
*r_rel
,
5177 unsigned long value
,
5178 bfd_boolean is_abs_literal
)
5180 lit
->r_rel
= *r_rel
;
5182 lit
->is_abs_literal
= is_abs_literal
;
5187 literal_value_equal (const literal_value
*src1
,
5188 const literal_value
*src2
,
5189 bfd_boolean final_static_link
)
5191 struct elf_link_hash_entry
*h1
, *h2
;
5193 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
5196 if (r_reloc_is_const (&src1
->r_rel
))
5197 return (src1
->value
== src2
->value
);
5199 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
5200 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
5203 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
5206 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
5209 if (src1
->value
!= src2
->value
)
5212 /* Now check for the same section (if defined) or the same elf_hash
5213 (if undefined or weak). */
5214 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
5215 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
5216 if (r_reloc_is_defined (&src1
->r_rel
)
5217 && (final_static_link
5218 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
5219 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
5221 if (r_reloc_get_section (&src1
->r_rel
)
5222 != r_reloc_get_section (&src2
->r_rel
))
5227 /* Require that the hash entries (i.e., symbols) be identical. */
5228 if (h1
!= h2
|| h1
== 0)
5232 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
5239 /* Must be power of 2. */
5240 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
5242 static value_map_hash_table
*
5243 value_map_hash_table_init (void)
5245 value_map_hash_table
*values
;
5247 values
= (value_map_hash_table
*)
5248 bfd_zmalloc (sizeof (value_map_hash_table
));
5249 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
5251 values
->buckets
= (value_map
**)
5252 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
5253 if (values
->buckets
== NULL
)
5258 values
->has_last_loc
= FALSE
;
5265 value_map_hash_table_delete (value_map_hash_table
*table
)
5267 free (table
->buckets
);
5273 hash_bfd_vma (bfd_vma val
)
5275 return (val
>> 2) + (val
>> 10);
5280 literal_value_hash (const literal_value
*src
)
5284 hash_val
= hash_bfd_vma (src
->value
);
5285 if (!r_reloc_is_const (&src
->r_rel
))
5289 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
5290 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
5291 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
5293 /* Now check for the same section and the same elf_hash. */
5294 if (r_reloc_is_defined (&src
->r_rel
))
5295 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
5297 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
5298 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
5304 /* Check if the specified literal_value has been seen before. */
5307 value_map_get_cached_value (value_map_hash_table
*map
,
5308 const literal_value
*val
,
5309 bfd_boolean final_static_link
)
5315 idx
= literal_value_hash (val
);
5316 idx
= idx
& (map
->bucket_count
- 1);
5317 bucket
= map
->buckets
[idx
];
5318 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
5320 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
5327 /* Record a new literal value. It is illegal to call this if VALUE
5328 already has an entry here. */
5331 add_value_map (value_map_hash_table
*map
,
5332 const literal_value
*val
,
5334 bfd_boolean final_static_link
)
5336 value_map
**bucket_p
;
5339 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
5342 bfd_set_error (bfd_error_no_memory
);
5346 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
5350 idx
= literal_value_hash (val
);
5351 idx
= idx
& (map
->bucket_count
- 1);
5352 bucket_p
= &map
->buckets
[idx
];
5354 val_e
->next
= *bucket_p
;
5357 /* FIXME: Consider resizing the hash table if we get too many entries. */
5363 /* Lists of text actions (ta_) for narrowing, widening, longcall
5364 conversion, space fill, code & literal removal, etc. */
5366 /* The following text actions are generated:
5368 "ta_remove_insn" remove an instruction or instructions
5369 "ta_remove_longcall" convert longcall to call
5370 "ta_convert_longcall" convert longcall to nop/call
5371 "ta_narrow_insn" narrow a wide instruction
5372 "ta_widen" widen a narrow instruction
5373 "ta_fill" add fill or remove fill
5374 removed < 0 is a fill; branches to the fill address will be
5375 changed to address + fill size (e.g., address - removed)
5376 removed >= 0 branches to the fill address will stay unchanged
5377 "ta_remove_literal" remove a literal; this action is
5378 indicated when a literal is removed
5380 "ta_add_literal" insert a new literal; this action is
5381 indicated when a literal has been moved.
5382 It may use a virtual_offset because
5383 multiple literals can be placed at the
5386 For each of these text actions, we also record the number of bytes
5387 removed by performing the text action. In the case of a "ta_widen"
5388 or a "ta_fill" that adds space, the removed_bytes will be negative. */
5390 typedef struct text_action_struct text_action
;
5391 typedef struct text_action_list_struct text_action_list
;
5392 typedef enum text_action_enum_t text_action_t
;
5394 enum text_action_enum_t
5397 ta_remove_insn
, /* removed = -size */
5398 ta_remove_longcall
, /* removed = -size */
5399 ta_convert_longcall
, /* removed = 0 */
5400 ta_narrow_insn
, /* removed = -1 */
5401 ta_widen_insn
, /* removed = +1 */
5402 ta_fill
, /* removed = +size */
5408 /* Structure for a text action record. */
5409 struct text_action_struct
5411 text_action_t action
;
5412 asection
*sec
; /* Optional */
5414 bfd_vma virtual_offset
; /* Zero except for adding literals. */
5416 literal_value value
; /* Only valid when adding literals. */
5419 struct removal_by_action_entry_struct
5424 int eq_removed_before_fill
;
5426 typedef struct removal_by_action_entry_struct removal_by_action_entry
;
5428 struct removal_by_action_map_struct
5431 removal_by_action_entry
*entry
;
5433 typedef struct removal_by_action_map_struct removal_by_action_map
;
5436 /* List of all of the actions taken on a text section. */
5437 struct text_action_list_struct
5441 removal_by_action_map map
;
5445 static text_action
*
5446 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
5450 /* It is not necessary to fill at the end of a section. */
5451 if (sec
->size
== offset
)
5457 splay_tree_node node
= splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
);
5459 return (text_action
*)node
->value
;
5465 compute_removed_action_diff (const text_action
*ta
,
5469 int removable_space
)
5472 int current_removed
= 0;
5475 current_removed
= ta
->removed_bytes
;
5477 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
5478 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
5480 /* It is not necessary to fill at the end of a section. Clean this up. */
5481 if (sec
->size
== offset
)
5482 new_removed
= removable_space
- 0;
5486 int added
= -removed
- current_removed
;
5487 /* Ignore multiples of the section alignment. */
5488 added
= ((1 << sec
->alignment_power
) - 1) & added
;
5489 new_removed
= (-added
);
5491 /* Modify for removable. */
5492 space
= removable_space
- new_removed
;
5493 new_removed
= (removable_space
5494 - (((1 << sec
->alignment_power
) - 1) & space
));
5496 return (new_removed
- current_removed
);
5501 adjust_fill_action (text_action
*ta
, int fill_diff
)
5503 ta
->removed_bytes
+= fill_diff
;
5508 text_action_compare (splay_tree_key a
, splay_tree_key b
)
5510 text_action
*pa
= (text_action
*)a
;
5511 text_action
*pb
= (text_action
*)b
;
5512 static const int action_priority
[] =
5516 [ta_convert_longcall
] = 2,
5517 [ta_narrow_insn
] = 3,
5518 [ta_remove_insn
] = 4,
5519 [ta_remove_longcall
] = 5,
5520 [ta_remove_literal
] = 6,
5521 [ta_widen_insn
] = 7,
5522 [ta_add_literal
] = 8,
5525 if (pa
->offset
== pb
->offset
)
5527 if (pa
->action
== pb
->action
)
5529 return action_priority
[pa
->action
] - action_priority
[pb
->action
];
5532 return pa
->offset
< pb
->offset
? -1 : 1;
5535 static text_action
*
5536 action_first (text_action_list
*action_list
)
5538 splay_tree_node node
= splay_tree_min (action_list
->tree
);
5539 return node
? (text_action
*)node
->value
: NULL
;
5542 static text_action
*
5543 action_next (text_action_list
*action_list
, text_action
*action
)
5545 splay_tree_node node
= splay_tree_successor (action_list
->tree
,
5546 (splay_tree_key
)action
);
5547 return node
? (text_action
*)node
->value
: NULL
;
5550 /* Add a modification action to the text. For the case of adding or
5551 removing space, modify any current fill and assume that
5552 "unreachable_space" bytes can be freely contracted. Note that a
5553 negative removed value is a fill. */
5556 text_action_add (text_action_list
*l
,
5557 text_action_t action
,
5565 /* It is not necessary to fill at the end of a section. */
5566 if (action
== ta_fill
&& sec
->size
== offset
)
5569 /* It is not necessary to fill 0 bytes. */
5570 if (action
== ta_fill
&& removed
== 0)
5576 if (action
== ta_fill
)
5578 splay_tree_node node
= splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
);
5582 ta
= (text_action
*)node
->value
;
5583 ta
->removed_bytes
+= removed
;
5588 BFD_ASSERT (splay_tree_lookup (l
->tree
, (splay_tree_key
)&a
) == NULL
);
5590 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
5591 ta
->action
= action
;
5593 ta
->offset
= offset
;
5594 ta
->removed_bytes
= removed
;
5595 splay_tree_insert (l
->tree
, (splay_tree_key
)ta
, (splay_tree_value
)ta
);
5601 text_action_add_literal (text_action_list
*l
,
5602 text_action_t action
,
5604 const literal_value
*value
,
5608 asection
*sec
= r_reloc_get_section (loc
);
5609 bfd_vma offset
= loc
->target_offset
;
5610 bfd_vma virtual_offset
= loc
->virtual_offset
;
5612 BFD_ASSERT (action
== ta_add_literal
);
5614 /* Create a new record and fill it up. */
5615 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
5616 ta
->action
= action
;
5618 ta
->offset
= offset
;
5619 ta
->virtual_offset
= virtual_offset
;
5621 ta
->removed_bytes
= removed
;
5623 BFD_ASSERT (splay_tree_lookup (l
->tree
, (splay_tree_key
)ta
) == NULL
);
5624 splay_tree_insert (l
->tree
, (splay_tree_key
)ta
, (splay_tree_value
)ta
);
5629 /* Find the total offset adjustment for the relaxations specified by
5630 text_actions, beginning from a particular starting action. This is
5631 typically used from offset_with_removed_text to search an entire list of
5632 actions, but it may also be called directly when adjusting adjacent offsets
5633 so that each search may begin where the previous one left off. */
5636 removed_by_actions (text_action_list
*action_list
,
5637 text_action
**p_start_action
,
5639 bfd_boolean before_fill
)
5644 r
= *p_start_action
;
5647 splay_tree_node node
= splay_tree_lookup (action_list
->tree
,
5649 BFD_ASSERT (node
!= NULL
&& r
== (text_action
*)node
->value
);
5654 if (r
->offset
> offset
)
5657 if (r
->offset
== offset
5658 && (before_fill
|| r
->action
!= ta_fill
|| r
->removed_bytes
>= 0))
5661 removed
+= r
->removed_bytes
;
5663 r
= action_next (action_list
, r
);
5666 *p_start_action
= r
;
5672 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
5674 text_action
*r
= action_first (action_list
);
5676 return offset
- removed_by_actions (action_list
, &r
, offset
, FALSE
);
5681 action_list_count (text_action_list
*action_list
)
5683 return action_list
->count
;
5686 typedef struct map_action_fn_context_struct map_action_fn_context
;
5687 struct map_action_fn_context_struct
5690 removal_by_action_map map
;
5691 bfd_boolean eq_complete
;
5695 map_action_fn (splay_tree_node node
, void *p
)
5697 map_action_fn_context
*ctx
= p
;
5698 text_action
*r
= (text_action
*)node
->value
;
5699 removal_by_action_entry
*ientry
= ctx
->map
.entry
+ ctx
->map
.n_entries
;
5701 if (ctx
->map
.n_entries
&& (ientry
- 1)->offset
== r
->offset
)
5707 ++ctx
->map
.n_entries
;
5708 ctx
->eq_complete
= FALSE
;
5709 ientry
->offset
= r
->offset
;
5710 ientry
->eq_removed_before_fill
= ctx
->removed
;
5713 if (!ctx
->eq_complete
)
5715 if (r
->action
!= ta_fill
|| r
->removed_bytes
>= 0)
5717 ientry
->eq_removed
= ctx
->removed
;
5718 ctx
->eq_complete
= TRUE
;
5721 ientry
->eq_removed
= ctx
->removed
+ r
->removed_bytes
;
5724 ctx
->removed
+= r
->removed_bytes
;
5725 ientry
->removed
= ctx
->removed
;
5730 map_removal_by_action (text_action_list
*action_list
)
5732 map_action_fn_context ctx
;
5735 ctx
.map
.n_entries
= 0;
5736 ctx
.map
.entry
= bfd_malloc (action_list_count (action_list
) *
5737 sizeof (removal_by_action_entry
));
5738 ctx
.eq_complete
= FALSE
;
5740 splay_tree_foreach (action_list
->tree
, map_action_fn
, &ctx
);
5741 action_list
->map
= ctx
.map
;
5745 removed_by_actions_map (text_action_list
*action_list
, bfd_vma offset
,
5746 bfd_boolean before_fill
)
5750 if (!action_list
->map
.entry
)
5751 map_removal_by_action (action_list
);
5753 if (!action_list
->map
.n_entries
)
5757 b
= action_list
->map
.n_entries
;
5761 unsigned c
= (a
+ b
) / 2;
5763 if (action_list
->map
.entry
[c
].offset
<= offset
)
5769 if (action_list
->map
.entry
[a
].offset
< offset
)
5771 return action_list
->map
.entry
[a
].removed
;
5773 else if (action_list
->map
.entry
[a
].offset
== offset
)
5775 return before_fill
?
5776 action_list
->map
.entry
[a
].eq_removed_before_fill
:
5777 action_list
->map
.entry
[a
].eq_removed
;
5786 offset_with_removed_text_map (text_action_list
*action_list
, bfd_vma offset
)
5788 int removed
= removed_by_actions_map (action_list
, offset
, FALSE
);
5789 return offset
- removed
;
5793 /* The find_insn_action routine will only find non-fill actions. */
5795 static text_action
*
5796 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
5798 static const text_action_t action
[] =
5800 ta_convert_longcall
,
5810 for (i
= 0; i
< sizeof (action
) / sizeof (*action
); ++i
)
5812 splay_tree_node node
;
5814 a
.action
= action
[i
];
5815 node
= splay_tree_lookup (action_list
->tree
, (splay_tree_key
)&a
);
5817 return (text_action
*)node
->value
;
5826 print_action (FILE *fp
, text_action
*r
)
5828 const char *t
= "unknown";
5831 case ta_remove_insn
:
5832 t
= "remove_insn"; break;
5833 case ta_remove_longcall
:
5834 t
= "remove_longcall"; break;
5835 case ta_convert_longcall
:
5836 t
= "convert_longcall"; break;
5837 case ta_narrow_insn
:
5838 t
= "narrow_insn"; break;
5840 t
= "widen_insn"; break;
5845 case ta_remove_literal
:
5846 t
= "remove_literal"; break;
5847 case ta_add_literal
:
5848 t
= "add_literal"; break;
5851 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
5852 r
->sec
->owner
->filename
,
5853 r
->sec
->name
, (unsigned long) r
->offset
, t
, r
->removed_bytes
);
5857 print_action_list_fn (splay_tree_node node
, void *p
)
5859 text_action
*r
= (text_action
*)node
->value
;
5861 print_action (p
, r
);
5866 print_action_list (FILE *fp
, text_action_list
*action_list
)
5868 fprintf (fp
, "Text Action\n");
5869 splay_tree_foreach (action_list
->tree
, print_action_list_fn
, fp
);
5875 /* Lists of literals being coalesced or removed. */
5877 /* In the usual case, the literal identified by "from" is being
5878 coalesced with another literal identified by "to". If the literal is
5879 unused and is being removed altogether, "to.abfd" will be NULL.
5880 The removed_literal entries are kept on a per-section list, sorted
5881 by the "from" offset field. */
5883 typedef struct removed_literal_struct removed_literal
;
5884 typedef struct removed_literal_map_entry_struct removed_literal_map_entry
;
5885 typedef struct removed_literal_list_struct removed_literal_list
;
5887 struct removed_literal_struct
5891 removed_literal
*next
;
5894 struct removed_literal_map_entry_struct
5897 removed_literal
*literal
;
5900 struct removed_literal_list_struct
5902 removed_literal
*head
;
5903 removed_literal
*tail
;
5906 removed_literal_map_entry
*map
;
5910 /* Record that the literal at "from" is being removed. If "to" is not
5911 NULL, the "from" literal is being coalesced with the "to" literal. */
5914 add_removed_literal (removed_literal_list
*removed_list
,
5915 const r_reloc
*from
,
5918 removed_literal
*r
, *new_r
, *next_r
;
5920 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
5922 new_r
->from
= *from
;
5926 new_r
->to
.abfd
= NULL
;
5929 r
= removed_list
->head
;
5932 removed_list
->head
= new_r
;
5933 removed_list
->tail
= new_r
;
5935 /* Special check for common case of append. */
5936 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
5938 removed_list
->tail
->next
= new_r
;
5939 removed_list
->tail
= new_r
;
5943 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
5949 new_r
->next
= next_r
;
5951 removed_list
->tail
= new_r
;
5956 map_removed_literal (removed_literal_list
*removed_list
)
5960 removed_literal_map_entry
*map
= NULL
;
5961 removed_literal
*r
= removed_list
->head
;
5963 for (i
= 0; r
; ++i
, r
= r
->next
)
5967 n_map
= (n_map
* 2) + 2;
5968 map
= bfd_realloc (map
, n_map
* sizeof (*map
));
5970 map
[i
].addr
= r
->from
.target_offset
;
5973 removed_list
->map
= map
;
5974 removed_list
->n_map
= i
;
5978 removed_literal_compare (const void *a
, const void *b
)
5980 const removed_literal_map_entry
*pa
= a
;
5981 const removed_literal_map_entry
*pb
= b
;
5983 if (pa
->addr
== pb
->addr
)
5986 return pa
->addr
< pb
->addr
? -1 : 1;
5989 /* Check if the list of removed literals contains an entry for the
5990 given address. Return the entry if found. */
5992 static removed_literal
*
5993 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
5995 removed_literal_map_entry
*p
;
5996 removed_literal
*r
= NULL
;
5998 if (removed_list
->map
== NULL
)
5999 map_removed_literal (removed_list
);
6001 p
= bsearch (&addr
, removed_list
->map
, removed_list
->n_map
,
6002 sizeof (*removed_list
->map
), removed_literal_compare
);
6005 while (p
!= removed_list
->map
&& (p
- 1)->addr
== addr
)
6016 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
6019 r
= removed_list
->head
;
6021 fprintf (fp
, "Removed Literals\n");
6022 for (; r
!= NULL
; r
= r
->next
)
6024 print_r_reloc (fp
, &r
->from
);
6025 fprintf (fp
, " => ");
6026 if (r
->to
.abfd
== NULL
)
6027 fprintf (fp
, "REMOVED");
6029 print_r_reloc (fp
, &r
->to
);
6037 /* Per-section data for relaxation. */
6039 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
6041 struct xtensa_relax_info_struct
6043 bfd_boolean is_relaxable_literal_section
;
6044 bfd_boolean is_relaxable_asm_section
;
6045 int visited
; /* Number of times visited. */
6047 source_reloc
*src_relocs
; /* Array[src_count]. */
6049 int src_next
; /* Next src_relocs entry to assign. */
6051 removed_literal_list removed_list
;
6052 text_action_list action_list
;
6054 reloc_bfd_fix
*fix_list
;
6055 reloc_bfd_fix
*fix_array
;
6056 unsigned fix_array_count
;
6058 /* Support for expanding the reloc array that is stored
6059 in the section structure. If the relocations have been
6060 reallocated, the newly allocated relocations will be referenced
6061 here along with the actual size allocated. The relocation
6062 count will always be found in the section structure. */
6063 Elf_Internal_Rela
*allocated_relocs
;
6064 unsigned relocs_count
;
6065 unsigned allocated_relocs_count
;
6068 struct elf_xtensa_section_data
6070 struct bfd_elf_section_data elf
;
6071 xtensa_relax_info relax_info
;
6076 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
6078 if (!sec
->used_by_bfd
)
6080 struct elf_xtensa_section_data
*sdata
;
6081 bfd_size_type amt
= sizeof (*sdata
);
6083 sdata
= bfd_zalloc (abfd
, amt
);
6086 sec
->used_by_bfd
= sdata
;
6089 return _bfd_elf_new_section_hook (abfd
, sec
);
6093 static xtensa_relax_info
*
6094 get_xtensa_relax_info (asection
*sec
)
6096 struct elf_xtensa_section_data
*section_data
;
6098 /* No info available if no section or if it is an output section. */
6099 if (!sec
|| sec
== sec
->output_section
)
6102 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
6103 return §ion_data
->relax_info
;
6108 init_xtensa_relax_info (asection
*sec
)
6110 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6112 relax_info
->is_relaxable_literal_section
= FALSE
;
6113 relax_info
->is_relaxable_asm_section
= FALSE
;
6114 relax_info
->visited
= 0;
6116 relax_info
->src_relocs
= NULL
;
6117 relax_info
->src_count
= 0;
6118 relax_info
->src_next
= 0;
6120 relax_info
->removed_list
.head
= NULL
;
6121 relax_info
->removed_list
.tail
= NULL
;
6123 relax_info
->action_list
.tree
= splay_tree_new (text_action_compare
,
6125 relax_info
->action_list
.map
.n_entries
= 0;
6126 relax_info
->action_list
.map
.entry
= NULL
;
6128 relax_info
->fix_list
= NULL
;
6129 relax_info
->fix_array
= NULL
;
6130 relax_info
->fix_array_count
= 0;
6132 relax_info
->allocated_relocs
= NULL
;
6133 relax_info
->relocs_count
= 0;
6134 relax_info
->allocated_relocs_count
= 0;
6138 /* Coalescing literals may require a relocation to refer to a section in
6139 a different input file, but the standard relocation information
6140 cannot express that. Instead, the reloc_bfd_fix structures are used
6141 to "fix" the relocations that refer to sections in other input files.
6142 These structures are kept on per-section lists. The "src_type" field
6143 records the relocation type in case there are multiple relocations on
6144 the same location. FIXME: This is ugly; an alternative might be to
6145 add new symbols with the "owner" field to some other input file. */
6147 struct reloc_bfd_fix_struct
6151 unsigned src_type
; /* Relocation type. */
6153 asection
*target_sec
;
6154 bfd_vma target_offset
;
6155 bfd_boolean translated
;
6157 reloc_bfd_fix
*next
;
6161 static reloc_bfd_fix
*
6162 reloc_bfd_fix_init (asection
*src_sec
,
6165 asection
*target_sec
,
6166 bfd_vma target_offset
,
6167 bfd_boolean translated
)
6171 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
6172 fix
->src_sec
= src_sec
;
6173 fix
->src_offset
= src_offset
;
6174 fix
->src_type
= src_type
;
6175 fix
->target_sec
= target_sec
;
6176 fix
->target_offset
= target_offset
;
6177 fix
->translated
= translated
;
6184 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
6186 xtensa_relax_info
*relax_info
;
6188 relax_info
= get_xtensa_relax_info (src_sec
);
6189 fix
->next
= relax_info
->fix_list
;
6190 relax_info
->fix_list
= fix
;
6195 fix_compare (const void *ap
, const void *bp
)
6197 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
6198 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
6200 if (a
->src_offset
!= b
->src_offset
)
6201 return (a
->src_offset
- b
->src_offset
);
6202 return (a
->src_type
- b
->src_type
);
6207 cache_fix_array (asection
*sec
)
6209 unsigned i
, count
= 0;
6211 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6213 if (relax_info
== NULL
)
6215 if (relax_info
->fix_list
== NULL
)
6218 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
6221 relax_info
->fix_array
=
6222 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
6223 relax_info
->fix_array_count
= count
;
6225 r
= relax_info
->fix_list
;
6226 for (i
= 0; i
< count
; i
++, r
= r
->next
)
6228 relax_info
->fix_array
[count
- 1 - i
] = *r
;
6229 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
6232 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
6233 sizeof (reloc_bfd_fix
), fix_compare
);
6237 static reloc_bfd_fix
*
6238 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
6240 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
6244 if (relax_info
== NULL
)
6246 if (relax_info
->fix_list
== NULL
)
6249 if (relax_info
->fix_array
== NULL
)
6250 cache_fix_array (sec
);
6252 key
.src_offset
= offset
;
6253 key
.src_type
= type
;
6254 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
6255 sizeof (reloc_bfd_fix
), fix_compare
);
6260 /* Section caching. */
6262 typedef struct section_cache_struct section_cache_t
;
6264 struct section_cache_struct
6268 bfd_byte
*contents
; /* Cache of the section contents. */
6269 bfd_size_type content_length
;
6271 property_table_entry
*ptbl
; /* Cache of the section property table. */
6274 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
6275 unsigned reloc_count
;
6280 init_section_cache (section_cache_t
*sec_cache
)
6282 memset (sec_cache
, 0, sizeof (*sec_cache
));
6287 free_section_cache (section_cache_t
*sec_cache
)
6291 release_contents (sec_cache
->sec
, sec_cache
->contents
);
6292 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
6293 if (sec_cache
->ptbl
)
6294 free (sec_cache
->ptbl
);
6300 section_cache_section (section_cache_t
*sec_cache
,
6302 struct bfd_link_info
*link_info
)
6305 property_table_entry
*prop_table
= NULL
;
6307 bfd_byte
*contents
= NULL
;
6308 Elf_Internal_Rela
*internal_relocs
= NULL
;
6309 bfd_size_type sec_size
;
6313 if (sec
== sec_cache
->sec
)
6317 sec_size
= bfd_get_section_limit (abfd
, sec
);
6319 /* Get the contents. */
6320 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6321 if (contents
== NULL
&& sec_size
!= 0)
6324 /* Get the relocations. */
6325 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6326 link_info
->keep_memory
);
6328 /* Get the entry table. */
6329 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6330 XTENSA_PROP_SEC_NAME
, FALSE
);
6334 /* Fill in the new section cache. */
6335 free_section_cache (sec_cache
);
6336 init_section_cache (sec_cache
);
6338 sec_cache
->sec
= sec
;
6339 sec_cache
->contents
= contents
;
6340 sec_cache
->content_length
= sec_size
;
6341 sec_cache
->relocs
= internal_relocs
;
6342 sec_cache
->reloc_count
= sec
->reloc_count
;
6343 sec_cache
->pte_count
= ptblsize
;
6344 sec_cache
->ptbl
= prop_table
;
6349 release_contents (sec
, contents
);
6350 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
)
6477 init_ebb (ebb_t
*ebb
,
6480 bfd_size_type content_length
,
6481 property_table_entry
*prop_table
,
6483 Elf_Internal_Rela
*internal_relocs
,
6484 unsigned reloc_count
)
6486 memset (ebb
, 0, sizeof (ebb_t
));
6488 ebb
->contents
= contents
;
6489 ebb
->content_length
= content_length
;
6490 ebb
->ptbl
= prop_table
;
6491 ebb
->pte_count
= ptblsize
;
6492 ebb
->relocs
= internal_relocs
;
6493 ebb
->reloc_count
= reloc_count
;
6494 ebb
->start_offset
= 0;
6495 ebb
->end_offset
= ebb
->content_length
- 1;
6496 ebb
->start_ptbl_idx
= 0;
6497 ebb
->end_ptbl_idx
= ptblsize
;
6498 ebb
->start_reloc_idx
= 0;
6499 ebb
->end_reloc_idx
= reloc_count
;
6503 /* Extend the ebb to all decodable contiguous sections. The algorithm
6504 for building a basic block around an instruction is to push it
6505 forward until we hit the end of a section, an unreachable block or
6506 a block that cannot be transformed. Then we push it backwards
6507 searching for similar conditions. */
6509 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
6510 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
6511 static bfd_size_type insn_block_decodable_len
6512 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
6515 extend_ebb_bounds (ebb_t
*ebb
)
6517 if (!extend_ebb_bounds_forward (ebb
))
6519 if (!extend_ebb_bounds_backward (ebb
))
6526 extend_ebb_bounds_forward (ebb_t
*ebb
)
6528 property_table_entry
*the_entry
, *new_entry
;
6530 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6532 /* Stop when (1) we cannot decode an instruction, (2) we are at
6533 the end of the property tables, (3) we hit a non-contiguous property
6534 table entry, (4) we hit a NO_TRANSFORM region. */
6539 bfd_size_type insn_block_len
;
6541 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
6543 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
6545 entry_end
- ebb
->end_offset
);
6546 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
6548 (*_bfd_error_handler
)
6549 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6550 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
6553 ebb
->end_offset
+= insn_block_len
;
6555 if (ebb
->end_offset
== ebb
->sec
->size
)
6556 ebb
->ends_section
= TRUE
;
6558 /* Update the reloc counter. */
6559 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
6560 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
6563 ebb
->end_reloc_idx
++;
6566 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
6569 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
6570 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
6571 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
6572 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
6575 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
6578 the_entry
= new_entry
;
6579 ebb
->end_ptbl_idx
++;
6582 /* Quick check for an unreachable or end of file just at the end. */
6583 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
6585 if (ebb
->end_offset
== ebb
->content_length
)
6586 ebb
->ends_section
= TRUE
;
6590 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
6591 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
6592 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
6593 ebb
->ends_unreachable
= new_entry
;
6596 /* Any other ending requires exact alignment. */
6602 extend_ebb_bounds_backward (ebb_t
*ebb
)
6604 property_table_entry
*the_entry
, *new_entry
;
6606 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6608 /* Stop when (1) we cannot decode the instructions in the current entry.
6609 (2) we are at the beginning of the property tables, (3) we hit a
6610 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
6614 bfd_vma block_begin
;
6615 bfd_size_type insn_block_len
;
6617 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
6619 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
6621 ebb
->start_offset
- block_begin
);
6622 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
6624 (*_bfd_error_handler
)
6625 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6626 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
6629 ebb
->start_offset
-= insn_block_len
;
6631 /* Update the reloc counter. */
6632 while (ebb
->start_reloc_idx
> 0
6633 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
6634 >= ebb
->start_offset
))
6636 ebb
->start_reloc_idx
--;
6639 if (ebb
->start_ptbl_idx
== 0)
6642 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
6643 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
6644 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
6645 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
6647 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
6650 the_entry
= new_entry
;
6651 ebb
->start_ptbl_idx
--;
6657 static bfd_size_type
6658 insn_block_decodable_len (bfd_byte
*contents
,
6659 bfd_size_type content_len
,
6660 bfd_vma block_offset
,
6661 bfd_size_type block_len
)
6663 bfd_vma offset
= block_offset
;
6665 while (offset
< block_offset
+ block_len
)
6667 bfd_size_type insn_len
= 0;
6669 insn_len
= insn_decode_len (contents
, content_len
, offset
);
6671 return (offset
- block_offset
);
6674 return (offset
- block_offset
);
6679 ebb_propose_action (ebb_constraint
*c
,
6680 enum ebb_target_enum align_type
,
6681 bfd_vma alignment_pow
,
6682 text_action_t action
,
6685 bfd_boolean do_action
)
6687 proposed_action
*act
;
6689 if (c
->action_allocated
<= c
->action_count
)
6691 unsigned new_allocated
, i
;
6692 proposed_action
*new_actions
;
6694 new_allocated
= (c
->action_count
+ 2) * 2;
6695 new_actions
= (proposed_action
*)
6696 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
6698 for (i
= 0; i
< c
->action_count
; i
++)
6699 new_actions
[i
] = c
->actions
[i
];
6702 c
->actions
= new_actions
;
6703 c
->action_allocated
= new_allocated
;
6706 act
= &c
->actions
[c
->action_count
];
6707 act
->align_type
= align_type
;
6708 act
->alignment_pow
= alignment_pow
;
6709 act
->action
= action
;
6710 act
->offset
= offset
;
6711 act
->removed_bytes
= removed_bytes
;
6712 act
->do_action
= do_action
;
6718 /* Access to internal relocations, section contents and symbols. */
6720 /* During relaxation, we need to modify relocations, section contents,
6721 and symbol definitions, and we need to keep the original values from
6722 being reloaded from the input files, i.e., we need to "pin" the
6723 modified values in memory. We also want to continue to observe the
6724 setting of the "keep-memory" flag. The following functions wrap the
6725 standard BFD functions to take care of this for us. */
6727 static Elf_Internal_Rela
*
6728 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
6730 Elf_Internal_Rela
*internal_relocs
;
6732 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
6735 internal_relocs
= elf_section_data (sec
)->relocs
;
6736 if (internal_relocs
== NULL
)
6737 internal_relocs
= (_bfd_elf_link_read_relocs
6738 (abfd
, sec
, NULL
, NULL
, keep_memory
));
6739 return internal_relocs
;
6744 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
6746 elf_section_data (sec
)->relocs
= internal_relocs
;
6751 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
6754 && elf_section_data (sec
)->relocs
!= internal_relocs
)
6755 free (internal_relocs
);
6760 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
6763 bfd_size_type sec_size
;
6765 sec_size
= bfd_get_section_limit (abfd
, sec
);
6766 contents
= elf_section_data (sec
)->this_hdr
.contents
;
6768 if (contents
== NULL
&& sec_size
!= 0)
6770 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
6777 elf_section_data (sec
)->this_hdr
.contents
= contents
;
6784 pin_contents (asection
*sec
, bfd_byte
*contents
)
6786 elf_section_data (sec
)->this_hdr
.contents
= contents
;
6791 release_contents (asection
*sec
, bfd_byte
*contents
)
6793 if (contents
&& elf_section_data (sec
)->this_hdr
.contents
!= contents
)
6798 static Elf_Internal_Sym
*
6799 retrieve_local_syms (bfd
*input_bfd
)
6801 Elf_Internal_Shdr
*symtab_hdr
;
6802 Elf_Internal_Sym
*isymbuf
;
6805 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6806 locsymcount
= symtab_hdr
->sh_info
;
6808 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6809 if (isymbuf
== NULL
&& locsymcount
!= 0)
6810 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6813 /* Save the symbols for this input file so they won't be read again. */
6814 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
6815 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
6821 /* Code for link-time relaxation. */
6823 /* Initialization for relaxation: */
6824 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
6825 static bfd_boolean find_relaxable_sections
6826 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
6827 static bfd_boolean collect_source_relocs
6828 (bfd
*, asection
*, struct bfd_link_info
*);
6829 static bfd_boolean is_resolvable_asm_expansion
6830 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
6832 static Elf_Internal_Rela
*find_associated_l32r_irel
6833 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
6834 static bfd_boolean compute_text_actions
6835 (bfd
*, asection
*, struct bfd_link_info
*);
6836 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
6837 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
6838 typedef struct reloc_range_list_struct reloc_range_list
;
6839 static bfd_boolean check_section_ebb_pcrels_fit
6840 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*,
6841 reloc_range_list
*, const ebb_constraint
*,
6842 const xtensa_opcode
*);
6843 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
6844 static void text_action_add_proposed
6845 (text_action_list
*, const ebb_constraint
*, asection
*);
6846 static int compute_fill_extra_space (property_table_entry
*);
6849 static bfd_boolean compute_removed_literals
6850 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
6851 static Elf_Internal_Rela
*get_irel_at_offset
6852 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
6853 static bfd_boolean is_removable_literal
6854 (const source_reloc
*, int, const source_reloc
*, int, asection
*,
6855 property_table_entry
*, int);
6856 static bfd_boolean remove_dead_literal
6857 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6858 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
6859 static bfd_boolean identify_literal_placement
6860 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
6861 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
6862 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
6864 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
6865 static bfd_boolean coalesce_shared_literal
6866 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
6867 static bfd_boolean move_shared_literal
6868 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
6869 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
6872 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
6873 static bfd_boolean
translate_section_fixes (asection
*);
6874 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
6875 static asection
*translate_reloc (const r_reloc
*, r_reloc
*, asection
*);
6876 static void shrink_dynamic_reloc_sections
6877 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
6878 static bfd_boolean move_literal
6879 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
6880 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
6881 static bfd_boolean relax_property_section
6882 (bfd
*, asection
*, struct bfd_link_info
*);
6885 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
6889 elf_xtensa_relax_section (bfd
*abfd
,
6891 struct bfd_link_info
*link_info
,
6894 static value_map_hash_table
*values
= NULL
;
6895 static bfd_boolean relocations_analyzed
= FALSE
;
6896 xtensa_relax_info
*relax_info
;
6898 if (!relocations_analyzed
)
6900 /* Do some overall initialization for relaxation. */
6901 values
= value_map_hash_table_init ();
6904 relaxing_section
= TRUE
;
6905 if (!analyze_relocations (link_info
))
6907 relocations_analyzed
= TRUE
;
6911 /* Don't mess with linker-created sections. */
6912 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
6915 relax_info
= get_xtensa_relax_info (sec
);
6916 BFD_ASSERT (relax_info
!= NULL
);
6918 switch (relax_info
->visited
)
6921 /* Note: It would be nice to fold this pass into
6922 analyze_relocations, but it is important for this step that the
6923 sections be examined in link order. */
6924 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
6931 value_map_hash_table_delete (values
);
6933 if (!relax_section (abfd
, sec
, link_info
))
6939 if (!relax_section_symbols (abfd
, sec
))
6944 relax_info
->visited
++;
6949 /* Initialization for relaxation. */
6951 /* This function is called once at the start of relaxation. It scans
6952 all the input sections and marks the ones that are relaxable (i.e.,
6953 literal sections with L32R relocations against them), and then
6954 collects source_reloc information for all the relocations against
6955 those relaxable sections. During this process, it also detects
6956 longcalls, i.e., calls relaxed by the assembler into indirect
6957 calls, that can be optimized back into direct calls. Within each
6958 extended basic block (ebb) containing an optimized longcall, it
6959 computes a set of "text actions" that can be performed to remove
6960 the L32R associated with the longcall while optionally preserving
6961 branch target alignments. */
6964 analyze_relocations (struct bfd_link_info
*link_info
)
6968 bfd_boolean is_relaxable
= FALSE
;
6970 /* Initialize the per-section relaxation info. */
6971 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6972 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6974 init_xtensa_relax_info (sec
);
6977 /* Mark relaxable sections (and count relocations against each one). */
6978 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6979 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6981 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
6985 /* Bail out if there are no relaxable sections. */
6989 /* Allocate space for source_relocs. */
6990 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
6991 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6993 xtensa_relax_info
*relax_info
;
6995 relax_info
= get_xtensa_relax_info (sec
);
6996 if (relax_info
->is_relaxable_literal_section
6997 || relax_info
->is_relaxable_asm_section
)
6999 relax_info
->src_relocs
= (source_reloc
*)
7000 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
7003 relax_info
->src_count
= 0;
7006 /* Collect info on relocations against each relaxable section. */
7007 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
7008 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7010 if (!collect_source_relocs (abfd
, sec
, link_info
))
7014 /* Compute the text actions. */
7015 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
7016 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7018 if (!compute_text_actions (abfd
, sec
, link_info
))
7026 /* Find all the sections that might be relaxed. The motivation for
7027 this pass is that collect_source_relocs() needs to record _all_ the
7028 relocations that target each relaxable section. That is expensive
7029 and unnecessary unless the target section is actually going to be
7030 relaxed. This pass identifies all such sections by checking if
7031 they have L32Rs pointing to them. In the process, the total number
7032 of relocations targeting each section is also counted so that we
7033 know how much space to allocate for source_relocs against each
7034 relaxable literal section. */
7037 find_relaxable_sections (bfd
*abfd
,
7039 struct bfd_link_info
*link_info
,
7040 bfd_boolean
*is_relaxable_p
)
7042 Elf_Internal_Rela
*internal_relocs
;
7044 bfd_boolean ok
= TRUE
;
7046 xtensa_relax_info
*source_relax_info
;
7047 bfd_boolean is_l32r_reloc
;
7049 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7050 link_info
->keep_memory
);
7051 if (internal_relocs
== NULL
)
7054 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7055 if (contents
== NULL
&& sec
->size
!= 0)
7061 source_relax_info
= get_xtensa_relax_info (sec
);
7062 for (i
= 0; i
< sec
->reloc_count
; i
++)
7064 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7066 asection
*target_sec
;
7067 xtensa_relax_info
*target_relax_info
;
7069 /* If this section has not already been marked as "relaxable", and
7070 if it contains any ASM_EXPAND relocations (marking expanded
7071 longcalls) that can be optimized into direct calls, then mark
7072 the section as "relaxable". */
7073 if (source_relax_info
7074 && !source_relax_info
->is_relaxable_asm_section
7075 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
7077 bfd_boolean is_reachable
= FALSE
;
7078 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
7079 link_info
, &is_reachable
)
7082 source_relax_info
->is_relaxable_asm_section
= TRUE
;
7083 *is_relaxable_p
= TRUE
;
7087 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7088 bfd_get_section_limit (abfd
, sec
));
7090 target_sec
= r_reloc_get_section (&r_rel
);
7091 target_relax_info
= get_xtensa_relax_info (target_sec
);
7092 if (!target_relax_info
)
7095 /* Count PC-relative operand relocations against the target section.
7096 Note: The conditions tested here must match the conditions under
7097 which init_source_reloc is called in collect_source_relocs(). */
7098 is_l32r_reloc
= FALSE
;
7099 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
7101 xtensa_opcode opcode
=
7102 get_relocation_opcode (abfd
, sec
, contents
, irel
);
7103 if (opcode
!= XTENSA_UNDEFINED
)
7105 is_l32r_reloc
= (opcode
== get_l32r_opcode ());
7106 if (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
7108 target_relax_info
->src_count
++;
7112 if (is_l32r_reloc
&& r_reloc_is_defined (&r_rel
))
7114 /* Mark the target section as relaxable. */
7115 target_relax_info
->is_relaxable_literal_section
= TRUE
;
7116 *is_relaxable_p
= TRUE
;
7121 release_contents (sec
, contents
);
7122 release_internal_relocs (sec
, internal_relocs
);
7127 /* Record _all_ the relocations that point to relaxable sections, and
7128 get rid of ASM_EXPAND relocs by either converting them to
7129 ASM_SIMPLIFY or by removing them. */
7132 collect_source_relocs (bfd
*abfd
,
7134 struct bfd_link_info
*link_info
)
7136 Elf_Internal_Rela
*internal_relocs
;
7138 bfd_boolean ok
= TRUE
;
7140 bfd_size_type sec_size
;
7142 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7143 link_info
->keep_memory
);
7144 if (internal_relocs
== NULL
)
7147 sec_size
= bfd_get_section_limit (abfd
, sec
);
7148 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7149 if (contents
== NULL
&& sec_size
!= 0)
7155 /* Record relocations against relaxable literal sections. */
7156 for (i
= 0; i
< sec
->reloc_count
; i
++)
7158 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7160 asection
*target_sec
;
7161 xtensa_relax_info
*target_relax_info
;
7163 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7165 target_sec
= r_reloc_get_section (&r_rel
);
7166 target_relax_info
= get_xtensa_relax_info (target_sec
);
7168 if (target_relax_info
7169 && (target_relax_info
->is_relaxable_literal_section
7170 || target_relax_info
->is_relaxable_asm_section
))
7172 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
7174 bfd_boolean is_abs_literal
= FALSE
;
7176 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7178 /* None of the current alternate relocs are PC-relative,
7179 and only PC-relative relocs matter here. However, we
7180 still need to record the opcode for literal
7182 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7183 if (opcode
== get_l32r_opcode ())
7185 is_abs_literal
= TRUE
;
7189 opcode
= XTENSA_UNDEFINED
;
7191 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
7193 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7194 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7197 if (opcode
!= XTENSA_UNDEFINED
)
7199 int src_next
= target_relax_info
->src_next
++;
7200 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
7202 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
7208 /* Now get rid of ASM_EXPAND relocations. At this point, the
7209 src_relocs array for the target literal section may still be
7210 incomplete, but it must at least contain the entries for the L32R
7211 relocations associated with ASM_EXPANDs because they were just
7212 added in the preceding loop over the relocations. */
7214 for (i
= 0; i
< sec
->reloc_count
; i
++)
7216 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7217 bfd_boolean is_reachable
;
7219 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
7225 Elf_Internal_Rela
*l32r_irel
;
7227 asection
*target_sec
;
7228 xtensa_relax_info
*target_relax_info
;
7230 /* Mark the source_reloc for the L32R so that it will be
7231 removed in compute_removed_literals(), along with the
7232 associated literal. */
7233 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
7234 irel
, internal_relocs
);
7235 if (l32r_irel
== NULL
)
7238 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
7240 target_sec
= r_reloc_get_section (&r_rel
);
7241 target_relax_info
= get_xtensa_relax_info (target_sec
);
7243 if (target_relax_info
7244 && (target_relax_info
->is_relaxable_literal_section
7245 || target_relax_info
->is_relaxable_asm_section
))
7247 source_reloc
*s_reloc
;
7249 /* Search the source_relocs for the entry corresponding to
7250 the l32r_irel. Note: The src_relocs array is not yet
7251 sorted, but it wouldn't matter anyway because we're
7252 searching by source offset instead of target offset. */
7253 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
7254 target_relax_info
->src_next
,
7256 BFD_ASSERT (s_reloc
);
7257 s_reloc
->is_null
= TRUE
;
7260 /* Convert this reloc to ASM_SIMPLIFY. */
7261 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
7262 R_XTENSA_ASM_SIMPLIFY
);
7263 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7265 pin_internal_relocs (sec
, internal_relocs
);
7269 /* It is resolvable but doesn't reach. We resolve now
7270 by eliminating the relocation -- the call will remain
7271 expanded into L32R/CALLX. */
7272 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7273 pin_internal_relocs (sec
, internal_relocs
);
7278 release_contents (sec
, contents
);
7279 release_internal_relocs (sec
, internal_relocs
);
7284 /* Return TRUE if the asm expansion can be resolved. Generally it can
7285 be resolved on a final link or when a partial link locates it in the
7286 same section as the target. Set "is_reachable" flag if the target of
7287 the call is within the range of a direct call, given the current VMA
7288 for this section and the target section. */
7291 is_resolvable_asm_expansion (bfd
*abfd
,
7294 Elf_Internal_Rela
*irel
,
7295 struct bfd_link_info
*link_info
,
7296 bfd_boolean
*is_reachable_p
)
7298 asection
*target_sec
;
7299 bfd_vma target_offset
;
7301 xtensa_opcode opcode
, direct_call_opcode
;
7302 bfd_vma self_address
;
7303 bfd_vma dest_address
;
7304 bfd_boolean uses_l32r
;
7305 bfd_size_type sec_size
;
7307 *is_reachable_p
= FALSE
;
7309 if (contents
== NULL
)
7312 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
7315 sec_size
= bfd_get_section_limit (abfd
, sec
);
7316 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
7317 sec_size
- irel
->r_offset
, &uses_l32r
);
7318 /* Optimization of longcalls that use CONST16 is not yet implemented. */
7322 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
7323 if (direct_call_opcode
== XTENSA_UNDEFINED
)
7326 /* Check and see that the target resolves. */
7327 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7328 if (!r_reloc_is_defined (&r_rel
))
7331 target_sec
= r_reloc_get_section (&r_rel
);
7332 target_offset
= r_rel
.target_offset
;
7334 /* If the target is in a shared library, then it doesn't reach. This
7335 isn't supposed to come up because the compiler should never generate
7336 non-PIC calls on systems that use shared libraries, but the linker
7337 shouldn't crash regardless. */
7338 if (!target_sec
->output_section
)
7341 /* For relocatable sections, we can only simplify when the output
7342 section of the target is the same as the output section of the
7344 if (bfd_link_relocatable (link_info
)
7345 && (target_sec
->output_section
!= sec
->output_section
7346 || is_reloc_sym_weak (abfd
, irel
)))
7349 if (target_sec
->output_section
!= sec
->output_section
)
7351 /* If the two sections are sufficiently far away that relaxation
7352 might take the call out of range, we can't simplify. For
7353 example, a positive displacement call into another memory
7354 could get moved to a lower address due to literal removal,
7355 but the destination won't move, and so the displacment might
7358 If the displacement is negative, assume the destination could
7359 move as far back as the start of the output section. The
7360 self_address will be at least as far into the output section
7361 as it is prior to relaxation.
7363 If the displacement is postive, assume the destination will be in
7364 it's pre-relaxed location (because relaxation only makes sections
7365 smaller). The self_address could go all the way to the beginning
7366 of the output section. */
7368 dest_address
= target_sec
->output_section
->vma
;
7369 self_address
= sec
->output_section
->vma
;
7371 if (sec
->output_section
->vma
> target_sec
->output_section
->vma
)
7372 self_address
+= sec
->output_offset
+ irel
->r_offset
+ 3;
7374 dest_address
+= bfd_get_section_limit (abfd
, target_sec
->output_section
);
7375 /* Call targets should be four-byte aligned. */
7376 dest_address
= (dest_address
+ 3) & ~3;
7381 self_address
= (sec
->output_section
->vma
7382 + sec
->output_offset
+ irel
->r_offset
+ 3);
7383 dest_address
= (target_sec
->output_section
->vma
7384 + target_sec
->output_offset
+ target_offset
);
7387 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
7388 self_address
, dest_address
);
7390 if ((self_address
>> CALL_SEGMENT_BITS
) !=
7391 (dest_address
>> CALL_SEGMENT_BITS
))
7398 static Elf_Internal_Rela
*
7399 find_associated_l32r_irel (bfd
*abfd
,
7402 Elf_Internal_Rela
*other_irel
,
7403 Elf_Internal_Rela
*internal_relocs
)
7407 for (i
= 0; i
< sec
->reloc_count
; i
++)
7409 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7411 if (irel
== other_irel
)
7413 if (irel
->r_offset
!= other_irel
->r_offset
)
7415 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
7423 static xtensa_opcode
*
7424 build_reloc_opcodes (bfd
*abfd
,
7427 Elf_Internal_Rela
*internal_relocs
)
7430 xtensa_opcode
*reloc_opcodes
=
7431 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
7432 for (i
= 0; i
< sec
->reloc_count
; i
++)
7434 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7435 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
7437 return reloc_opcodes
;
7440 struct reloc_range_struct
7443 bfd_boolean add
; /* TRUE if start of a range, FALSE otherwise. */
7444 /* Original irel index in the array of relocations for a section. */
7445 unsigned irel_index
;
7447 typedef struct reloc_range_struct reloc_range
;
7449 typedef struct reloc_range_list_entry_struct reloc_range_list_entry
;
7450 struct reloc_range_list_entry_struct
7452 reloc_range_list_entry
*next
;
7453 reloc_range_list_entry
*prev
;
7454 Elf_Internal_Rela
*irel
;
7455 xtensa_opcode opcode
;
7459 struct reloc_range_list_struct
7461 /* The rest of the structure is only meaningful when ok is TRUE. */
7464 unsigned n_range
; /* Number of range markers. */
7465 reloc_range
*range
; /* Sorted range markers. */
7467 unsigned first
; /* Index of a first range element in the list. */
7468 unsigned last
; /* One past index of a last range element in the list. */
7470 unsigned n_list
; /* Number of list elements. */
7471 reloc_range_list_entry
*reloc
; /* */
7472 reloc_range_list_entry list_root
;
7476 reloc_range_compare (const void *a
, const void *b
)
7478 const reloc_range
*ra
= a
;
7479 const reloc_range
*rb
= b
;
7481 if (ra
->addr
!= rb
->addr
)
7482 return ra
->addr
< rb
->addr
? -1 : 1;
7483 if (ra
->add
!= rb
->add
)
7484 return ra
->add
? -1 : 1;
7489 build_reloc_ranges (bfd
*abfd
, asection
*sec
,
7491 Elf_Internal_Rela
*internal_relocs
,
7492 xtensa_opcode
*reloc_opcodes
,
7493 reloc_range_list
*list
)
7498 reloc_range
*ranges
= NULL
;
7499 reloc_range_list_entry
*reloc
=
7500 bfd_malloc (sec
->reloc_count
* sizeof (*reloc
));
7502 memset (list
, 0, sizeof (*list
));
7505 for (i
= 0; i
< sec
->reloc_count
; i
++)
7507 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7508 int r_type
= ELF32_R_TYPE (irel
->r_info
);
7509 reloc_howto_type
*howto
= &elf_howto_table
[r_type
];
7512 if (r_type
== R_XTENSA_ASM_SIMPLIFY
7513 || r_type
== R_XTENSA_32_PCREL
7514 || !howto
->pc_relative
)
7517 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7518 bfd_get_section_limit (abfd
, sec
));
7520 if (r_reloc_get_section (&r_rel
) != sec
)
7525 max_n
= (max_n
+ 2) * 2;
7526 ranges
= bfd_realloc (ranges
, max_n
* sizeof (*ranges
));
7529 ranges
[n
].addr
= irel
->r_offset
;
7530 ranges
[n
+ 1].addr
= r_rel
.target_offset
;
7532 ranges
[n
].add
= ranges
[n
].addr
< ranges
[n
+ 1].addr
;
7533 ranges
[n
+ 1].add
= !ranges
[n
].add
;
7535 ranges
[n
].irel_index
= i
;
7536 ranges
[n
+ 1].irel_index
= i
;
7540 reloc
[i
].irel
= irel
;
7542 /* Every relocation won't possibly be checked in the optimized version of
7543 check_section_ebb_pcrels_fit, so this needs to be done here. */
7544 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7546 /* None of the current alternate relocs are PC-relative,
7547 and only PC-relative relocs matter here. */
7551 xtensa_opcode opcode
;
7555 opcode
= reloc_opcodes
[i
];
7557 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7559 if (opcode
== XTENSA_UNDEFINED
)
7565 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7566 if (opnum
== XTENSA_UNDEFINED
)
7572 /* Record relocation opcode and opnum as we've calculated them
7573 anyway and they won't change. */
7574 reloc
[i
].opcode
= opcode
;
7575 reloc
[i
].opnum
= opnum
;
7581 ranges
= bfd_realloc (ranges
, n
* sizeof (*ranges
));
7582 qsort (ranges
, n
, sizeof (*ranges
), reloc_range_compare
);
7585 list
->range
= ranges
;
7586 list
->reloc
= reloc
;
7587 list
->list_root
.prev
= &list
->list_root
;
7588 list
->list_root
.next
= &list
->list_root
;
7597 static void reloc_range_list_append (reloc_range_list
*list
,
7598 unsigned irel_index
)
7600 reloc_range_list_entry
*entry
= list
->reloc
+ irel_index
;
7602 entry
->prev
= list
->list_root
.prev
;
7603 entry
->next
= &list
->list_root
;
7604 entry
->prev
->next
= entry
;
7605 entry
->next
->prev
= entry
;
7609 static void reloc_range_list_remove (reloc_range_list
*list
,
7610 unsigned irel_index
)
7612 reloc_range_list_entry
*entry
= list
->reloc
+ irel_index
;
7614 entry
->next
->prev
= entry
->prev
;
7615 entry
->prev
->next
= entry
->next
;
7619 /* Update relocation list object so that it lists all relocations that cross
7620 [first; last] range. Range bounds should not decrease with successive
7622 static void reloc_range_list_update_range (reloc_range_list
*list
,
7623 bfd_vma first
, bfd_vma last
)
7625 /* This should not happen: EBBs are iterated from lower addresses to higher.
7626 But even if that happens there's no need to break: just flush current list
7627 and start from scratch. */
7628 if ((list
->last
> 0 && list
->range
[list
->last
- 1].addr
> last
) ||
7629 (list
->first
> 0 && list
->range
[list
->first
- 1].addr
>= first
))
7634 list
->list_root
.next
= &list
->list_root
;
7635 list
->list_root
.prev
= &list
->list_root
;
7636 fprintf (stderr
, "%s: move backwards requested\n", __func__
);
7639 for (; list
->last
< list
->n_range
&&
7640 list
->range
[list
->last
].addr
<= last
; ++list
->last
)
7641 if (list
->range
[list
->last
].add
)
7642 reloc_range_list_append (list
, list
->range
[list
->last
].irel_index
);
7644 for (; list
->first
< list
->n_range
&&
7645 list
->range
[list
->first
].addr
< first
; ++list
->first
)
7646 if (!list
->range
[list
->first
].add
)
7647 reloc_range_list_remove (list
, list
->range
[list
->first
].irel_index
);
7650 static void free_reloc_range_list (reloc_range_list
*list
)
7656 /* The compute_text_actions function will build a list of potential
7657 transformation actions for code in the extended basic block of each
7658 longcall that is optimized to a direct call. From this list we
7659 generate a set of actions to actually perform that optimizes for
7660 space and, if not using size_opt, maintains branch target
7663 These actions to be performed are placed on a per-section list.
7664 The actual changes are performed by relax_section() in the second
7668 compute_text_actions (bfd
*abfd
,
7670 struct bfd_link_info
*link_info
)
7672 xtensa_opcode
*reloc_opcodes
= NULL
;
7673 xtensa_relax_info
*relax_info
;
7675 Elf_Internal_Rela
*internal_relocs
;
7676 bfd_boolean ok
= TRUE
;
7678 property_table_entry
*prop_table
= 0;
7680 bfd_size_type sec_size
;
7681 reloc_range_list relevant_relocs
;
7683 relax_info
= get_xtensa_relax_info (sec
);
7684 BFD_ASSERT (relax_info
);
7685 BFD_ASSERT (relax_info
->src_next
== relax_info
->src_count
);
7687 /* Do nothing if the section contains no optimized longcalls. */
7688 if (!relax_info
->is_relaxable_asm_section
)
7691 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7692 link_info
->keep_memory
);
7694 if (internal_relocs
)
7695 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7696 internal_reloc_compare
);
7698 sec_size
= bfd_get_section_limit (abfd
, sec
);
7699 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7700 if (contents
== NULL
&& sec_size
!= 0)
7706 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7707 XTENSA_PROP_SEC_NAME
, FALSE
);
7714 /* Precompute the opcode for each relocation. */
7715 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
, internal_relocs
);
7717 build_reloc_ranges (abfd
, sec
, contents
, internal_relocs
, reloc_opcodes
,
7720 for (i
= 0; i
< sec
->reloc_count
; i
++)
7722 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
7724 property_table_entry
*the_entry
;
7727 ebb_constraint ebb_table
;
7728 bfd_size_type simplify_size
;
7730 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
7732 r_offset
= irel
->r_offset
;
7734 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
7735 if (simplify_size
== 0)
7737 (*_bfd_error_handler
)
7738 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
7739 sec
->owner
, sec
, r_offset
);
7743 /* If the instruction table is not around, then don't do this
7745 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7746 sec
->vma
+ irel
->r_offset
);
7747 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
7749 text_action_add (&relax_info
->action_list
,
7750 ta_convert_longcall
, sec
, r_offset
,
7755 /* If the next longcall happens to be at the same address as an
7756 unreachable section of size 0, then skip forward. */
7757 ptbl_idx
= the_entry
- prop_table
;
7758 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
7759 && the_entry
->size
== 0
7760 && ptbl_idx
+ 1 < ptblsize
7761 && (prop_table
[ptbl_idx
+ 1].address
7762 == prop_table
[ptbl_idx
].address
))
7768 if (the_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
)
7769 /* NO_REORDER is OK */
7772 init_ebb_constraint (&ebb_table
);
7773 ebb
= &ebb_table
.ebb
;
7774 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
7775 internal_relocs
, sec
->reloc_count
);
7776 ebb
->start_offset
= r_offset
+ simplify_size
;
7777 ebb
->end_offset
= r_offset
+ simplify_size
;
7778 ebb
->start_ptbl_idx
= ptbl_idx
;
7779 ebb
->end_ptbl_idx
= ptbl_idx
;
7780 ebb
->start_reloc_idx
= i
;
7781 ebb
->end_reloc_idx
= i
;
7783 if (!extend_ebb_bounds (ebb
)
7784 || !compute_ebb_proposed_actions (&ebb_table
)
7785 || !compute_ebb_actions (&ebb_table
)
7786 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
7789 &ebb_table
, reloc_opcodes
)
7790 || !check_section_ebb_reduces (&ebb_table
))
7792 /* If anything goes wrong or we get unlucky and something does
7793 not fit, with our plan because of expansion between
7794 critical branches, just convert to a NOP. */
7796 text_action_add (&relax_info
->action_list
,
7797 ta_convert_longcall
, sec
, r_offset
, 0);
7798 i
= ebb_table
.ebb
.end_reloc_idx
;
7799 free_ebb_constraint (&ebb_table
);
7803 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
7805 /* Update the index so we do not go looking at the relocations
7806 we have already processed. */
7807 i
= ebb_table
.ebb
.end_reloc_idx
;
7808 free_ebb_constraint (&ebb_table
);
7811 free_reloc_range_list (&relevant_relocs
);
7814 if (action_list_count (&relax_info
->action_list
))
7815 print_action_list (stderr
, &relax_info
->action_list
);
7819 release_contents (sec
, contents
);
7820 release_internal_relocs (sec
, internal_relocs
);
7824 free (reloc_opcodes
);
7830 /* Do not widen an instruction if it is preceeded by a
7831 loop opcode. It might cause misalignment. */
7834 prev_instr_is_a_loop (bfd_byte
*contents
,
7835 bfd_size_type content_length
,
7836 bfd_size_type offset
)
7838 xtensa_opcode prev_opcode
;
7842 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
7843 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
7847 /* Find all of the possible actions for an extended basic block. */
7850 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
7852 const ebb_t
*ebb
= &ebb_table
->ebb
;
7853 unsigned rel_idx
= ebb
->start_reloc_idx
;
7854 property_table_entry
*entry
, *start_entry
, *end_entry
;
7856 xtensa_isa isa
= xtensa_default_isa
;
7858 static xtensa_insnbuf insnbuf
= NULL
;
7859 static xtensa_insnbuf slotbuf
= NULL
;
7861 if (insnbuf
== NULL
)
7863 insnbuf
= xtensa_insnbuf_alloc (isa
);
7864 slotbuf
= xtensa_insnbuf_alloc (isa
);
7867 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
7868 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
7870 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
7872 bfd_vma start_offset
, end_offset
;
7873 bfd_size_type insn_len
;
7875 start_offset
= entry
->address
- ebb
->sec
->vma
;
7876 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
7878 if (entry
== start_entry
)
7879 start_offset
= ebb
->start_offset
;
7880 if (entry
== end_entry
)
7881 end_offset
= ebb
->end_offset
;
7882 offset
= start_offset
;
7884 if (offset
== entry
->address
- ebb
->sec
->vma
7885 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
7887 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
7888 BFD_ASSERT (offset
!= end_offset
);
7889 if (offset
== end_offset
)
7892 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
7897 if (check_branch_target_aligned_address (offset
, insn_len
))
7898 align_type
= EBB_REQUIRE_TGT_ALIGN
;
7900 ebb_propose_action (ebb_table
, align_type
, 0,
7901 ta_none
, offset
, 0, TRUE
);
7904 while (offset
!= end_offset
)
7906 Elf_Internal_Rela
*irel
;
7907 xtensa_opcode opcode
;
7909 while (rel_idx
< ebb
->end_reloc_idx
7910 && (ebb
->relocs
[rel_idx
].r_offset
< offset
7911 || (ebb
->relocs
[rel_idx
].r_offset
== offset
7912 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
7913 != R_XTENSA_ASM_SIMPLIFY
))))
7916 /* Check for longcall. */
7917 irel
= &ebb
->relocs
[rel_idx
];
7918 if (irel
->r_offset
== offset
7919 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
7921 bfd_size_type simplify_size
;
7923 simplify_size
= get_asm_simplify_size (ebb
->contents
,
7924 ebb
->content_length
,
7926 if (simplify_size
== 0)
7929 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
7930 ta_convert_longcall
, offset
, 0, TRUE
);
7932 offset
+= simplify_size
;
7936 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
7938 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
7939 ebb
->content_length
- offset
);
7940 fmt
= xtensa_format_decode (isa
, insnbuf
);
7941 if (fmt
== XTENSA_UNDEFINED
)
7943 insn_len
= xtensa_format_length (isa
, fmt
);
7944 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
7947 if (xtensa_format_num_slots (isa
, fmt
) != 1)
7953 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
7954 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
7955 if (opcode
== XTENSA_UNDEFINED
)
7958 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
7959 && (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
7960 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
7962 /* Add an instruction narrow action. */
7963 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
7964 ta_narrow_insn
, offset
, 0, FALSE
);
7966 else if ((entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
7967 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
7968 && ! prev_instr_is_a_loop (ebb
->contents
,
7969 ebb
->content_length
, offset
))
7971 /* Add an instruction widen action. */
7972 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
7973 ta_widen_insn
, offset
, 0, FALSE
);
7975 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
7977 /* Check for branch targets. */
7978 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
7979 ta_none
, offset
, 0, TRUE
);
7986 if (ebb
->ends_unreachable
)
7988 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
7989 ta_fill
, ebb
->end_offset
, 0, TRUE
);
7995 (*_bfd_error_handler
)
7996 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
7997 ebb
->sec
->owner
, ebb
->sec
, offset
);
8002 /* After all of the information has collected about the
8003 transformations possible in an EBB, compute the appropriate actions
8004 here in compute_ebb_actions. We still must check later to make
8005 sure that the actions do not break any relocations. The algorithm
8006 used here is pretty greedy. Basically, it removes as many no-ops
8007 as possible so that the end of the EBB has the same alignment
8008 characteristics as the original. First, it uses narrowing, then
8009 fill space at the end of the EBB, and finally widenings. If that
8010 does not work, it tries again with one fewer no-op removed. The
8011 optimization will only be performed if all of the branch targets
8012 that were aligned before transformation are also aligned after the
8015 When the size_opt flag is set, ignore the branch target alignments,
8016 narrow all wide instructions, and remove all no-ops unless the end
8017 of the EBB prevents it. */
8020 compute_ebb_actions (ebb_constraint
*ebb_table
)
8024 int removed_bytes
= 0;
8025 ebb_t
*ebb
= &ebb_table
->ebb
;
8026 unsigned seg_idx_start
= 0;
8027 unsigned seg_idx_end
= 0;
8029 /* We perform this like the assembler relaxation algorithm: Start by
8030 assuming all instructions are narrow and all no-ops removed; then
8033 /* For each segment of this that has a solid constraint, check to
8034 see if there are any combinations that will keep the constraint.
8036 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
8038 bfd_boolean requires_text_end_align
= FALSE
;
8039 unsigned longcall_count
= 0;
8040 unsigned longcall_convert_count
= 0;
8041 unsigned narrowable_count
= 0;
8042 unsigned narrowable_convert_count
= 0;
8043 unsigned widenable_count
= 0;
8044 unsigned widenable_convert_count
= 0;
8046 proposed_action
*action
= NULL
;
8047 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
8049 seg_idx_start
= seg_idx_end
;
8051 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
8053 action
= &ebb_table
->actions
[i
];
8054 if (action
->action
== ta_convert_longcall
)
8056 if (action
->action
== ta_narrow_insn
)
8058 if (action
->action
== ta_widen_insn
)
8060 if (action
->action
== ta_fill
)
8062 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
8064 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
8065 && !elf32xtensa_size_opt
)
8070 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
8071 requires_text_end_align
= TRUE
;
8073 if (elf32xtensa_size_opt
&& !requires_text_end_align
8074 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
8075 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
8077 longcall_convert_count
= longcall_count
;
8078 narrowable_convert_count
= narrowable_count
;
8079 widenable_convert_count
= 0;
8083 /* There is a constraint. Convert the max number of longcalls. */
8084 narrowable_convert_count
= 0;
8085 longcall_convert_count
= 0;
8086 widenable_convert_count
= 0;
8088 for (j
= 0; j
< longcall_count
; j
++)
8090 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
8091 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
8092 unsigned desire_widen
= removed
;
8093 if (desire_narrow
<= narrowable_count
)
8095 narrowable_convert_count
= desire_narrow
;
8096 narrowable_convert_count
+=
8097 (align
* ((narrowable_count
- narrowable_convert_count
)
8099 longcall_convert_count
= (longcall_count
- j
);
8100 widenable_convert_count
= 0;
8103 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
8105 narrowable_convert_count
= 0;
8106 longcall_convert_count
= longcall_count
- j
;
8107 widenable_convert_count
= desire_widen
;
8113 /* Now the number of conversions are saved. Do them. */
8114 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
8116 action
= &ebb_table
->actions
[i
];
8117 switch (action
->action
)
8119 case ta_convert_longcall
:
8120 if (longcall_convert_count
!= 0)
8122 action
->action
= ta_remove_longcall
;
8123 action
->do_action
= TRUE
;
8124 action
->removed_bytes
+= 3;
8125 longcall_convert_count
--;
8128 case ta_narrow_insn
:
8129 if (narrowable_convert_count
!= 0)
8131 action
->do_action
= TRUE
;
8132 action
->removed_bytes
+= 1;
8133 narrowable_convert_count
--;
8137 if (widenable_convert_count
!= 0)
8139 action
->do_action
= TRUE
;
8140 action
->removed_bytes
-= 1;
8141 widenable_convert_count
--;
8150 /* Now we move on to some local opts. Try to remove each of the
8151 remaining longcalls. */
8153 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
8156 for (i
= 0; i
< ebb_table
->action_count
; i
++)
8158 int old_removed_bytes
= removed_bytes
;
8159 proposed_action
*action
= &ebb_table
->actions
[i
];
8161 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
8163 bfd_boolean bad_alignment
= FALSE
;
8165 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
8167 proposed_action
*new_action
= &ebb_table
->actions
[j
];
8168 bfd_vma offset
= new_action
->offset
;
8169 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
8171 if (!check_branch_target_aligned
8172 (ebb_table
->ebb
.contents
,
8173 ebb_table
->ebb
.content_length
,
8174 offset
, offset
- removed_bytes
))
8176 bad_alignment
= TRUE
;
8180 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
8182 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
8183 ebb_table
->ebb
.content_length
,
8185 offset
- removed_bytes
))
8187 bad_alignment
= TRUE
;
8191 if (new_action
->action
== ta_narrow_insn
8192 && !new_action
->do_action
8193 && ebb_table
->ebb
.sec
->alignment_power
== 2)
8195 /* Narrow an instruction and we are done. */
8196 new_action
->do_action
= TRUE
;
8197 new_action
->removed_bytes
+= 1;
8198 bad_alignment
= FALSE
;
8201 if (new_action
->action
== ta_widen_insn
8202 && new_action
->do_action
8203 && ebb_table
->ebb
.sec
->alignment_power
== 2)
8205 /* Narrow an instruction and we are done. */
8206 new_action
->do_action
= FALSE
;
8207 new_action
->removed_bytes
+= 1;
8208 bad_alignment
= FALSE
;
8211 if (new_action
->do_action
)
8212 removed_bytes
+= new_action
->removed_bytes
;
8216 action
->removed_bytes
+= 3;
8217 action
->action
= ta_remove_longcall
;
8218 action
->do_action
= TRUE
;
8221 removed_bytes
= old_removed_bytes
;
8222 if (action
->do_action
)
8223 removed_bytes
+= action
->removed_bytes
;
8228 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
8230 proposed_action
*action
= &ebb_table
->actions
[i
];
8231 if (action
->do_action
)
8232 removed_bytes
+= action
->removed_bytes
;
8235 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
8236 && ebb
->ends_unreachable
)
8238 proposed_action
*action
;
8242 BFD_ASSERT (ebb_table
->action_count
!= 0);
8243 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
8244 BFD_ASSERT (action
->action
== ta_fill
);
8245 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
8247 extra_space
= compute_fill_extra_space (ebb
->ends_unreachable
);
8248 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
8249 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
8251 action
->removed_bytes
= extra_space
- br
;
8257 /* The xlate_map is a sorted array of address mappings designed to
8258 answer the offset_with_removed_text() query with a binary search instead
8259 of a linear search through the section's action_list. */
8261 typedef struct xlate_map_entry xlate_map_entry_t
;
8262 typedef struct xlate_map xlate_map_t
;
8264 struct xlate_map_entry
8266 unsigned orig_address
;
8267 unsigned new_address
;
8273 unsigned entry_count
;
8274 xlate_map_entry_t
*entry
;
8279 xlate_compare (const void *a_v
, const void *b_v
)
8281 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
8282 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
8283 if (a
->orig_address
< b
->orig_address
)
8285 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
8292 xlate_offset_with_removed_text (const xlate_map_t
*map
,
8293 text_action_list
*action_list
,
8297 xlate_map_entry_t
*e
;
8300 return offset_with_removed_text (action_list
, offset
);
8302 if (map
->entry_count
== 0)
8305 r
= bsearch (&offset
, map
->entry
, map
->entry_count
,
8306 sizeof (xlate_map_entry_t
), &xlate_compare
);
8307 e
= (xlate_map_entry_t
*) r
;
8309 BFD_ASSERT (e
!= NULL
);
8312 return e
->new_address
- e
->orig_address
+ offset
;
8315 typedef struct xlate_map_context_struct xlate_map_context
;
8316 struct xlate_map_context_struct
8319 xlate_map_entry_t
*current_entry
;
8324 xlate_map_fn (splay_tree_node node
, void *p
)
8326 text_action
*r
= (text_action
*)node
->value
;
8327 xlate_map_context
*ctx
= p
;
8328 unsigned orig_size
= 0;
8333 case ta_remove_insn
:
8334 case ta_convert_longcall
:
8335 case ta_remove_literal
:
8336 case ta_add_literal
:
8338 case ta_remove_longcall
:
8341 case ta_narrow_insn
:
8350 ctx
->current_entry
->size
=
8351 r
->offset
+ orig_size
- ctx
->current_entry
->orig_address
;
8352 if (ctx
->current_entry
->size
!= 0)
8354 ctx
->current_entry
++;
8355 ctx
->map
->entry_count
++;
8357 ctx
->current_entry
->orig_address
= r
->offset
+ orig_size
;
8358 ctx
->removed
+= r
->removed_bytes
;
8359 ctx
->current_entry
->new_address
= r
->offset
+ orig_size
- ctx
->removed
;
8360 ctx
->current_entry
->size
= 0;
8364 /* Build a binary searchable offset translation map from a section's
8367 static xlate_map_t
*
8368 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
8370 text_action_list
*action_list
= &relax_info
->action_list
;
8371 unsigned num_actions
= 0;
8372 xlate_map_context ctx
;
8374 ctx
.map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
8376 if (ctx
.map
== NULL
)
8379 num_actions
= action_list_count (action_list
);
8380 ctx
.map
->entry
= (xlate_map_entry_t
*)
8381 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
8382 if (ctx
.map
->entry
== NULL
)
8387 ctx
.map
->entry_count
= 0;
8390 ctx
.current_entry
= &ctx
.map
->entry
[0];
8392 ctx
.current_entry
->orig_address
= 0;
8393 ctx
.current_entry
->new_address
= 0;
8394 ctx
.current_entry
->size
= 0;
8396 splay_tree_foreach (action_list
->tree
, xlate_map_fn
, &ctx
);
8398 ctx
.current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
8399 - ctx
.current_entry
->orig_address
);
8400 if (ctx
.current_entry
->size
!= 0)
8401 ctx
.map
->entry_count
++;
8407 /* Free an offset translation map. */
8410 free_xlate_map (xlate_map_t
*map
)
8412 if (map
&& map
->entry
)
8419 /* Use check_section_ebb_pcrels_fit to make sure that all of the
8420 relocations in a section will fit if a proposed set of actions
8424 check_section_ebb_pcrels_fit (bfd
*abfd
,
8427 Elf_Internal_Rela
*internal_relocs
,
8428 reloc_range_list
*relevant_relocs
,
8429 const ebb_constraint
*constraint
,
8430 const xtensa_opcode
*reloc_opcodes
)
8433 unsigned n
= sec
->reloc_count
;
8434 Elf_Internal_Rela
*irel
;
8435 xlate_map_t
*xmap
= NULL
;
8436 bfd_boolean ok
= TRUE
;
8437 xtensa_relax_info
*relax_info
;
8438 reloc_range_list_entry
*entry
= NULL
;
8440 relax_info
= get_xtensa_relax_info (sec
);
8442 if (relax_info
&& sec
->reloc_count
> 100)
8444 xmap
= build_xlate_map (sec
, relax_info
);
8445 /* NULL indicates out of memory, but the slow version
8446 can still be used. */
8449 if (relevant_relocs
&& constraint
->action_count
)
8451 if (!relevant_relocs
->ok
)
8458 bfd_vma min_offset
, max_offset
;
8459 min_offset
= max_offset
= constraint
->actions
[0].offset
;
8461 for (i
= 1; i
< constraint
->action_count
; ++i
)
8463 proposed_action
*action
= &constraint
->actions
[i
];
8464 bfd_vma offset
= action
->offset
;
8466 if (offset
< min_offset
)
8467 min_offset
= offset
;
8468 if (offset
> max_offset
)
8469 max_offset
= offset
;
8471 reloc_range_list_update_range (relevant_relocs
, min_offset
,
8473 n
= relevant_relocs
->n_list
;
8474 entry
= &relevant_relocs
->list_root
;
8479 relevant_relocs
= NULL
;
8482 for (i
= 0; i
< n
; i
++)
8485 bfd_vma orig_self_offset
, orig_target_offset
;
8486 bfd_vma self_offset
, target_offset
;
8488 reloc_howto_type
*howto
;
8489 int self_removed_bytes
, target_removed_bytes
;
8491 if (relevant_relocs
)
8493 entry
= entry
->next
;
8498 irel
= internal_relocs
+ i
;
8500 r_type
= ELF32_R_TYPE (irel
->r_info
);
8502 howto
= &elf_howto_table
[r_type
];
8503 /* We maintain the required invariant: PC-relative relocations
8504 that fit before linking must fit after linking. Thus we only
8505 need to deal with relocations to the same section that are
8507 if (r_type
== R_XTENSA_ASM_SIMPLIFY
8508 || r_type
== R_XTENSA_32_PCREL
8509 || !howto
->pc_relative
)
8512 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8513 bfd_get_section_limit (abfd
, sec
));
8515 if (r_reloc_get_section (&r_rel
) != sec
)
8518 orig_self_offset
= irel
->r_offset
;
8519 orig_target_offset
= r_rel
.target_offset
;
8521 self_offset
= orig_self_offset
;
8522 target_offset
= orig_target_offset
;
8527 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
8530 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
8531 orig_target_offset
);
8534 self_removed_bytes
= 0;
8535 target_removed_bytes
= 0;
8537 for (j
= 0; j
< constraint
->action_count
; ++j
)
8539 proposed_action
*action
= &constraint
->actions
[j
];
8540 bfd_vma offset
= action
->offset
;
8541 int removed_bytes
= action
->removed_bytes
;
8542 if (offset
< orig_self_offset
8543 || (offset
== orig_self_offset
&& action
->action
== ta_fill
8544 && action
->removed_bytes
< 0))
8545 self_removed_bytes
+= removed_bytes
;
8546 if (offset
< orig_target_offset
8547 || (offset
== orig_target_offset
&& action
->action
== ta_fill
8548 && action
->removed_bytes
< 0))
8549 target_removed_bytes
+= removed_bytes
;
8551 self_offset
-= self_removed_bytes
;
8552 target_offset
-= target_removed_bytes
;
8554 /* Try to encode it. Get the operand and check. */
8555 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
8557 /* None of the current alternate relocs are PC-relative,
8558 and only PC-relative relocs matter here. */
8562 xtensa_opcode opcode
;
8565 if (relevant_relocs
)
8567 opcode
= entry
->opcode
;
8568 opnum
= entry
->opnum
;
8573 opcode
= reloc_opcodes
[relevant_relocs
?
8574 (unsigned)(entry
- relevant_relocs
->reloc
) : i
];
8576 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
8577 if (opcode
== XTENSA_UNDEFINED
)
8583 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
8584 if (opnum
== XTENSA_UNDEFINED
)
8591 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
8600 free_xlate_map (xmap
);
8607 check_section_ebb_reduces (const ebb_constraint
*constraint
)
8612 for (i
= 0; i
< constraint
->action_count
; i
++)
8614 const proposed_action
*action
= &constraint
->actions
[i
];
8615 if (action
->do_action
)
8616 removed
+= action
->removed_bytes
;
8626 text_action_add_proposed (text_action_list
*l
,
8627 const ebb_constraint
*ebb_table
,
8632 for (i
= 0; i
< ebb_table
->action_count
; i
++)
8634 proposed_action
*action
= &ebb_table
->actions
[i
];
8636 if (!action
->do_action
)
8638 switch (action
->action
)
8640 case ta_remove_insn
:
8641 case ta_remove_longcall
:
8642 case ta_convert_longcall
:
8643 case ta_narrow_insn
:
8646 case ta_remove_literal
:
8647 text_action_add (l
, action
->action
, sec
, action
->offset
,
8648 action
->removed_bytes
);
8661 compute_fill_extra_space (property_table_entry
*entry
)
8663 int fill_extra_space
;
8668 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
8671 fill_extra_space
= entry
->size
;
8672 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
8674 /* Fill bytes for alignment:
8675 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
8676 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
8677 int nsm
= (1 << pow
) - 1;
8678 bfd_vma addr
= entry
->address
+ entry
->size
;
8679 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
8680 fill_extra_space
+= align_fill
;
8682 return fill_extra_space
;
8686 /* First relaxation pass. */
8688 /* If the section contains relaxable literals, check each literal to
8689 see if it has the same value as another literal that has already
8690 been seen, either in the current section or a previous one. If so,
8691 add an entry to the per-section list of removed literals. The
8692 actual changes are deferred until the next pass. */
8695 compute_removed_literals (bfd
*abfd
,
8697 struct bfd_link_info
*link_info
,
8698 value_map_hash_table
*values
)
8700 xtensa_relax_info
*relax_info
;
8702 Elf_Internal_Rela
*internal_relocs
;
8703 source_reloc
*src_relocs
, *rel
;
8704 bfd_boolean ok
= TRUE
;
8705 property_table_entry
*prop_table
= NULL
;
8708 bfd_boolean last_loc_is_prev
= FALSE
;
8709 bfd_vma last_target_offset
= 0;
8710 section_cache_t target_sec_cache
;
8711 bfd_size_type sec_size
;
8713 init_section_cache (&target_sec_cache
);
8715 /* Do nothing if it is not a relaxable literal section. */
8716 relax_info
= get_xtensa_relax_info (sec
);
8717 BFD_ASSERT (relax_info
);
8718 if (!relax_info
->is_relaxable_literal_section
)
8721 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8722 link_info
->keep_memory
);
8724 sec_size
= bfd_get_section_limit (abfd
, sec
);
8725 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8726 if (contents
== NULL
&& sec_size
!= 0)
8732 /* Sort the source_relocs by target offset. */
8733 src_relocs
= relax_info
->src_relocs
;
8734 qsort (src_relocs
, relax_info
->src_count
,
8735 sizeof (source_reloc
), source_reloc_compare
);
8736 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
8737 internal_reloc_compare
);
8739 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
8740 XTENSA_PROP_SEC_NAME
, FALSE
);
8748 for (i
= 0; i
< relax_info
->src_count
; i
++)
8750 Elf_Internal_Rela
*irel
= NULL
;
8752 rel
= &src_relocs
[i
];
8753 if (get_l32r_opcode () != rel
->opcode
)
8755 irel
= get_irel_at_offset (sec
, internal_relocs
,
8756 rel
->r_rel
.target_offset
);
8758 /* If the relocation on this is not a simple R_XTENSA_32 or
8759 R_XTENSA_PLT then do not consider it. This may happen when
8760 the difference of two symbols is used in a literal. */
8761 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
8762 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
8765 /* If the target_offset for this relocation is the same as the
8766 previous relocation, then we've already considered whether the
8767 literal can be coalesced. Skip to the next one.... */
8768 if (i
!= 0 && prev_i
!= -1
8769 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
8773 if (last_loc_is_prev
&&
8774 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
8775 last_loc_is_prev
= FALSE
;
8777 /* Check if the relocation was from an L32R that is being removed
8778 because a CALLX was converted to a direct CALL, and check if
8779 there are no other relocations to the literal. */
8780 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
,
8781 sec
, prop_table
, ptblsize
))
8783 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
8784 irel
, rel
, prop_table
, ptblsize
))
8789 last_target_offset
= rel
->r_rel
.target_offset
;
8793 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
8795 &last_loc_is_prev
, irel
,
8796 relax_info
->src_count
- i
, rel
,
8797 prop_table
, ptblsize
,
8798 &target_sec_cache
, rel
->is_abs_literal
))
8803 last_target_offset
= rel
->r_rel
.target_offset
;
8807 print_removed_literals (stderr
, &relax_info
->removed_list
);
8808 print_action_list (stderr
, &relax_info
->action_list
);
8814 free_section_cache (&target_sec_cache
);
8816 release_contents (sec
, contents
);
8817 release_internal_relocs (sec
, internal_relocs
);
8822 static Elf_Internal_Rela
*
8823 get_irel_at_offset (asection
*sec
,
8824 Elf_Internal_Rela
*internal_relocs
,
8828 Elf_Internal_Rela
*irel
;
8830 Elf_Internal_Rela key
;
8832 if (!internal_relocs
)
8835 key
.r_offset
= offset
;
8836 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
8837 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
8841 /* bsearch does not guarantee which will be returned if there are
8842 multiple matches. We need the first that is not an alignment. */
8843 i
= irel
- internal_relocs
;
8846 if (internal_relocs
[i
-1].r_offset
!= offset
)
8850 for ( ; i
< sec
->reloc_count
; i
++)
8852 irel
= &internal_relocs
[i
];
8853 r_type
= ELF32_R_TYPE (irel
->r_info
);
8854 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
8863 is_removable_literal (const source_reloc
*rel
,
8865 const source_reloc
*src_relocs
,
8868 property_table_entry
*prop_table
,
8871 const source_reloc
*curr_rel
;
8872 property_table_entry
*entry
;
8877 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8878 sec
->vma
+ rel
->r_rel
.target_offset
);
8879 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
8882 for (++i
; i
< src_count
; ++i
)
8884 curr_rel
= &src_relocs
[i
];
8885 /* If all others have the same target offset.... */
8886 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
8889 if (!curr_rel
->is_null
8890 && !xtensa_is_property_section (curr_rel
->source_sec
)
8891 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
8899 remove_dead_literal (bfd
*abfd
,
8901 struct bfd_link_info
*link_info
,
8902 Elf_Internal_Rela
*internal_relocs
,
8903 Elf_Internal_Rela
*irel
,
8905 property_table_entry
*prop_table
,
8908 property_table_entry
*entry
;
8909 xtensa_relax_info
*relax_info
;
8911 relax_info
= get_xtensa_relax_info (sec
);
8915 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8916 sec
->vma
+ rel
->r_rel
.target_offset
);
8918 /* Mark the unused literal so that it will be removed. */
8919 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
8921 text_action_add (&relax_info
->action_list
,
8922 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
8924 /* If the section is 4-byte aligned, do not add fill. */
8925 if (sec
->alignment_power
> 2)
8927 int fill_extra_space
;
8928 bfd_vma entry_sec_offset
;
8930 property_table_entry
*the_add_entry
;
8934 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
8936 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
8938 /* If the literal range is at the end of the section,
8940 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8942 fill_extra_space
= compute_fill_extra_space (the_add_entry
);
8944 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
8945 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
8946 -4, fill_extra_space
);
8948 adjust_fill_action (fa
, removed_diff
);
8950 text_action_add (&relax_info
->action_list
,
8951 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
8954 /* Zero out the relocation on this literal location. */
8957 if (elf_hash_table (link_info
)->dynamic_sections_created
)
8958 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
8960 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
8961 pin_internal_relocs (sec
, internal_relocs
);
8964 /* Do not modify "last_loc_is_prev". */
8970 identify_literal_placement (bfd
*abfd
,
8973 struct bfd_link_info
*link_info
,
8974 value_map_hash_table
*values
,
8975 bfd_boolean
*last_loc_is_prev_p
,
8976 Elf_Internal_Rela
*irel
,
8977 int remaining_src_rels
,
8979 property_table_entry
*prop_table
,
8981 section_cache_t
*target_sec_cache
,
8982 bfd_boolean is_abs_literal
)
8986 xtensa_relax_info
*relax_info
;
8987 bfd_boolean literal_placed
= FALSE
;
8989 unsigned long value
;
8990 bfd_boolean final_static_link
;
8991 bfd_size_type sec_size
;
8993 relax_info
= get_xtensa_relax_info (sec
);
8997 sec_size
= bfd_get_section_limit (abfd
, sec
);
9000 (!bfd_link_relocatable (link_info
)
9001 && !elf_hash_table (link_info
)->dynamic_sections_created
);
9003 /* The placement algorithm first checks to see if the literal is
9004 already in the value map. If so and the value map is reachable
9005 from all uses, then the literal is moved to that location. If
9006 not, then we identify the last location where a fresh literal was
9007 placed. If the literal can be safely moved there, then we do so.
9008 If not, then we assume that the literal is not to move and leave
9009 the literal where it is, marking it as the last literal
9012 /* Find the literal value. */
9014 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
9017 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
9018 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
9020 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
9022 /* Check if we've seen another literal with the same value that
9023 is in the same output section. */
9024 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
9027 && (r_reloc_get_section (&val_map
->loc
)->output_section
9028 == sec
->output_section
)
9029 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
9030 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
9032 /* No change to last_loc_is_prev. */
9033 literal_placed
= TRUE
;
9036 /* For relocatable links, do not try to move literals. To do it
9037 correctly might increase the number of relocations in an input
9038 section making the default relocatable linking fail. */
9039 if (!bfd_link_relocatable (link_info
) && !literal_placed
9040 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
9042 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
9043 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
9045 /* Increment the virtual offset. */
9046 r_reloc try_loc
= values
->last_loc
;
9047 try_loc
.virtual_offset
+= 4;
9049 /* There is a last loc that was in the same output section. */
9050 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
9051 && move_shared_literal (sec
, link_info
, rel
,
9052 prop_table
, ptblsize
,
9053 &try_loc
, &val
, target_sec_cache
))
9055 values
->last_loc
.virtual_offset
+= 4;
9056 literal_placed
= TRUE
;
9058 val_map
= add_value_map (values
, &val
, &try_loc
,
9061 val_map
->loc
= try_loc
;
9066 if (!literal_placed
)
9068 /* Nothing worked, leave the literal alone but update the last loc. */
9069 values
->has_last_loc
= TRUE
;
9070 values
->last_loc
= rel
->r_rel
;
9072 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
9074 val_map
->loc
= rel
->r_rel
;
9075 *last_loc_is_prev_p
= TRUE
;
9082 /* Check if the original relocations (presumably on L32R instructions)
9083 identified by reloc[0..N] can be changed to reference the literal
9084 identified by r_rel. If r_rel is out of range for any of the
9085 original relocations, then we don't want to coalesce the original
9086 literal with the one at r_rel. We only check reloc[0..N], where the
9087 offsets are all the same as for reloc[0] (i.e., they're all
9088 referencing the same literal) and where N is also bounded by the
9089 number of remaining entries in the "reloc" array. The "reloc" array
9090 is sorted by target offset so we know all the entries for the same
9091 literal will be contiguous. */
9094 relocations_reach (source_reloc
*reloc
,
9095 int remaining_relocs
,
9096 const r_reloc
*r_rel
)
9098 bfd_vma from_offset
, source_address
, dest_address
;
9102 if (!r_reloc_is_defined (r_rel
))
9105 sec
= r_reloc_get_section (r_rel
);
9106 from_offset
= reloc
[0].r_rel
.target_offset
;
9108 for (i
= 0; i
< remaining_relocs
; i
++)
9110 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
9113 /* Ignore relocations that have been removed. */
9114 if (reloc
[i
].is_null
)
9117 /* The original and new output section for these must be the same
9118 in order to coalesce. */
9119 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
9120 != sec
->output_section
)
9123 /* Absolute literals in the same output section can always be
9125 if (reloc
[i
].is_abs_literal
)
9128 /* A literal with no PC-relative relocations can be moved anywhere. */
9129 if (reloc
[i
].opnd
!= -1)
9131 /* Otherwise, check to see that it fits. */
9132 source_address
= (reloc
[i
].source_sec
->output_section
->vma
9133 + reloc
[i
].source_sec
->output_offset
9134 + reloc
[i
].r_rel
.rela
.r_offset
);
9135 dest_address
= (sec
->output_section
->vma
9136 + sec
->output_offset
9137 + r_rel
->target_offset
);
9139 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
9140 source_address
, dest_address
))
9149 /* Move a literal to another literal location because it is
9150 the same as the other literal value. */
9153 coalesce_shared_literal (asection
*sec
,
9155 property_table_entry
*prop_table
,
9159 property_table_entry
*entry
;
9161 property_table_entry
*the_add_entry
;
9163 xtensa_relax_info
*relax_info
;
9165 relax_info
= get_xtensa_relax_info (sec
);
9169 entry
= elf_xtensa_find_property_entry
9170 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
9171 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
9174 /* Mark that the literal will be coalesced. */
9175 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
9177 text_action_add (&relax_info
->action_list
,
9178 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
9180 /* If the section is 4-byte aligned, do not add fill. */
9181 if (sec
->alignment_power
> 2)
9183 int fill_extra_space
;
9184 bfd_vma entry_sec_offset
;
9187 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
9189 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
9191 /* If the literal range is at the end of the section,
9193 fill_extra_space
= 0;
9194 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
9196 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9197 fill_extra_space
= the_add_entry
->size
;
9199 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
9200 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
9201 -4, fill_extra_space
);
9203 adjust_fill_action (fa
, removed_diff
);
9205 text_action_add (&relax_info
->action_list
,
9206 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
9213 /* Move a literal to another location. This may actually increase the
9214 total amount of space used because of alignments so we need to do
9215 this carefully. Also, it may make a branch go out of range. */
9218 move_shared_literal (asection
*sec
,
9219 struct bfd_link_info
*link_info
,
9221 property_table_entry
*prop_table
,
9223 const r_reloc
*target_loc
,
9224 const literal_value
*lit_value
,
9225 section_cache_t
*target_sec_cache
)
9227 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
9228 text_action
*fa
, *target_fa
;
9230 xtensa_relax_info
*relax_info
, *target_relax_info
;
9231 asection
*target_sec
;
9233 ebb_constraint ebb_table
;
9234 bfd_boolean relocs_fit
;
9236 /* If this routine always returns FALSE, the literals that cannot be
9237 coalesced will not be moved. */
9238 if (elf32xtensa_no_literal_movement
)
9241 relax_info
= get_xtensa_relax_info (sec
);
9245 target_sec
= r_reloc_get_section (target_loc
);
9246 target_relax_info
= get_xtensa_relax_info (target_sec
);
9248 /* Literals to undefined sections may not be moved because they
9249 must report an error. */
9250 if (bfd_is_und_section (target_sec
))
9253 src_entry
= elf_xtensa_find_property_entry
9254 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
9256 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
9259 target_entry
= elf_xtensa_find_property_entry
9260 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
9261 target_sec
->vma
+ target_loc
->target_offset
);
9266 /* Make sure that we have not broken any branches. */
9269 init_ebb_constraint (&ebb_table
);
9270 ebb
= &ebb_table
.ebb
;
9271 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
9272 target_sec_cache
->content_length
,
9273 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
9274 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
9276 /* Propose to add 4 bytes + worst-case alignment size increase to
9278 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
9279 ta_fill
, target_loc
->target_offset
,
9280 -4 - (1 << target_sec
->alignment_power
), TRUE
);
9282 /* Check all of the PC-relative relocations to make sure they still fit. */
9283 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
9284 target_sec_cache
->contents
,
9285 target_sec_cache
->relocs
, NULL
,
9291 text_action_add_literal (&target_relax_info
->action_list
,
9292 ta_add_literal
, target_loc
, lit_value
, -4);
9294 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
9296 /* May need to add or remove some fill to maintain alignment. */
9297 int fill_extra_space
;
9298 bfd_vma entry_sec_offset
;
9301 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
9303 /* If the literal range is at the end of the section,
9305 fill_extra_space
= 0;
9307 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
9308 target_sec_cache
->pte_count
,
9310 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9311 fill_extra_space
= the_add_entry
->size
;
9313 target_fa
= find_fill_action (&target_relax_info
->action_list
,
9314 target_sec
, entry_sec_offset
);
9315 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
9316 entry_sec_offset
, 4,
9319 adjust_fill_action (target_fa
, removed_diff
);
9321 text_action_add (&target_relax_info
->action_list
,
9322 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
9325 /* Mark that the literal will be moved to the new location. */
9326 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
9328 /* Remove the literal. */
9329 text_action_add (&relax_info
->action_list
,
9330 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
9332 /* If the section is 4-byte aligned, do not add fill. */
9333 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
9335 int fill_extra_space
;
9336 bfd_vma entry_sec_offset
;
9339 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
9341 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
9343 /* If the literal range is at the end of the section,
9345 fill_extra_space
= 0;
9346 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
9348 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
9349 fill_extra_space
= the_add_entry
->size
;
9351 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
9352 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
9353 -4, fill_extra_space
);
9355 adjust_fill_action (fa
, removed_diff
);
9357 text_action_add (&relax_info
->action_list
,
9358 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
9365 /* Second relaxation pass. */
9368 action_remove_bytes_fn (splay_tree_node node
, void *p
)
9370 bfd_size_type
*final_size
= p
;
9371 text_action
*action
= (text_action
*)node
->value
;
9373 *final_size
-= action
->removed_bytes
;
9377 /* Modify all of the relocations to point to the right spot, and if this
9378 is a relaxable section, delete the unwanted literals and fix the
9382 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
9384 Elf_Internal_Rela
*internal_relocs
;
9385 xtensa_relax_info
*relax_info
;
9387 bfd_boolean ok
= TRUE
;
9389 bfd_boolean rv
= FALSE
;
9390 bfd_boolean virtual_action
;
9391 bfd_size_type sec_size
;
9393 sec_size
= bfd_get_section_limit (abfd
, sec
);
9394 relax_info
= get_xtensa_relax_info (sec
);
9395 BFD_ASSERT (relax_info
);
9397 /* First translate any of the fixes that have been added already. */
9398 translate_section_fixes (sec
);
9400 /* Handle property sections (e.g., literal tables) specially. */
9401 if (xtensa_is_property_section (sec
))
9403 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
9404 return relax_property_section (abfd
, sec
, link_info
);
9407 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9408 link_info
->keep_memory
);
9409 if (!internal_relocs
&& !action_list_count (&relax_info
->action_list
))
9412 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9413 if (contents
== NULL
&& sec_size
!= 0)
9419 if (internal_relocs
)
9421 for (i
= 0; i
< sec
->reloc_count
; i
++)
9423 Elf_Internal_Rela
*irel
;
9424 xtensa_relax_info
*target_relax_info
;
9425 bfd_vma source_offset
, old_source_offset
;
9428 asection
*target_sec
;
9430 /* Locally change the source address.
9431 Translate the target to the new target address.
9432 If it points to this section and has been removed,
9436 irel
= &internal_relocs
[i
];
9437 source_offset
= irel
->r_offset
;
9438 old_source_offset
= source_offset
;
9440 r_type
= ELF32_R_TYPE (irel
->r_info
);
9441 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
9442 bfd_get_section_limit (abfd
, sec
));
9444 /* If this section could have changed then we may need to
9445 change the relocation's offset. */
9447 if (relax_info
->is_relaxable_literal_section
9448 || relax_info
->is_relaxable_asm_section
)
9450 pin_internal_relocs (sec
, internal_relocs
);
9452 if (r_type
!= R_XTENSA_NONE
9453 && find_removed_literal (&relax_info
->removed_list
,
9456 /* Remove this relocation. */
9457 if (elf_hash_table (link_info
)->dynamic_sections_created
)
9458 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
9459 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9460 irel
->r_offset
= offset_with_removed_text_map
9461 (&relax_info
->action_list
, irel
->r_offset
);
9465 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
9467 text_action
*action
=
9468 find_insn_action (&relax_info
->action_list
,
9470 if (action
&& (action
->action
== ta_convert_longcall
9471 || action
->action
== ta_remove_longcall
))
9473 bfd_reloc_status_type retval
;
9474 char *error_message
= NULL
;
9476 retval
= contract_asm_expansion (contents
, sec_size
,
9477 irel
, &error_message
);
9478 if (retval
!= bfd_reloc_ok
)
9480 (*link_info
->callbacks
->reloc_dangerous
)
9481 (link_info
, error_message
, abfd
, sec
,
9485 /* Update the action so that the code that moves
9486 the contents will do the right thing. */
9487 /* ta_remove_longcall and ta_remove_insn actions are
9488 grouped together in the tree as well as
9489 ta_convert_longcall and ta_none, so that changes below
9490 can be done w/o removing and reinserting action into
9493 if (action
->action
== ta_remove_longcall
)
9494 action
->action
= ta_remove_insn
;
9496 action
->action
= ta_none
;
9497 /* Refresh the info in the r_rel. */
9498 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
9499 r_type
= ELF32_R_TYPE (irel
->r_info
);
9503 source_offset
= offset_with_removed_text_map
9504 (&relax_info
->action_list
, irel
->r_offset
);
9505 irel
->r_offset
= source_offset
;
9508 /* If the target section could have changed then
9509 we may need to change the relocation's target offset. */
9511 target_sec
= r_reloc_get_section (&r_rel
);
9513 /* For a reference to a discarded section from a DWARF section,
9514 i.e., where action_discarded is PRETEND, the symbol will
9515 eventually be modified to refer to the kept section (at least if
9516 the kept and discarded sections are the same size). Anticipate
9517 that here and adjust things accordingly. */
9518 if (! elf_xtensa_ignore_discarded_relocs (sec
)
9519 && elf_xtensa_action_discarded (sec
) == PRETEND
9520 && sec
->sec_info_type
!= SEC_INFO_TYPE_STABS
9521 && target_sec
!= NULL
9522 && discarded_section (target_sec
))
9524 /* It would be natural to call _bfd_elf_check_kept_section
9525 here, but it's not exported from elflink.c. It's also a
9526 fairly expensive check. Adjusting the relocations to the
9527 discarded section is fairly harmless; it will only adjust
9528 some addends and difference values. If it turns out that
9529 _bfd_elf_check_kept_section fails later, it won't matter,
9530 so just compare the section names to find the right group
9532 asection
*kept
= target_sec
->kept_section
;
9535 if ((kept
->flags
& SEC_GROUP
) != 0)
9537 asection
*first
= elf_next_in_group (kept
);
9538 asection
*s
= first
;
9543 if (strcmp (s
->name
, target_sec
->name
) == 0)
9548 s
= elf_next_in_group (s
);
9555 && ((target_sec
->rawsize
!= 0
9556 ? target_sec
->rawsize
: target_sec
->size
)
9557 == (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9561 target_relax_info
= get_xtensa_relax_info (target_sec
);
9562 if (target_relax_info
9563 && (target_relax_info
->is_relaxable_literal_section
9564 || target_relax_info
->is_relaxable_asm_section
))
9567 target_sec
= translate_reloc (&r_rel
, &new_reloc
, target_sec
);
9569 if (r_type
== R_XTENSA_DIFF8
9570 || r_type
== R_XTENSA_DIFF16
9571 || r_type
== R_XTENSA_DIFF32
)
9573 bfd_signed_vma diff_value
= 0;
9574 bfd_vma new_end_offset
, diff_mask
= 0;
9576 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
9578 (*link_info
->callbacks
->reloc_dangerous
)
9579 (link_info
, _("invalid relocation address"),
9580 abfd
, sec
, old_source_offset
);
9586 case R_XTENSA_DIFF8
:
9588 bfd_get_signed_8 (abfd
, &contents
[old_source_offset
]);
9590 case R_XTENSA_DIFF16
:
9592 bfd_get_signed_16 (abfd
, &contents
[old_source_offset
]);
9594 case R_XTENSA_DIFF32
:
9596 bfd_get_signed_32 (abfd
, &contents
[old_source_offset
]);
9600 new_end_offset
= offset_with_removed_text_map
9601 (&target_relax_info
->action_list
,
9602 r_rel
.target_offset
+ diff_value
);
9603 diff_value
= new_end_offset
- new_reloc
.target_offset
;
9607 case R_XTENSA_DIFF8
:
9609 bfd_put_signed_8 (abfd
, diff_value
,
9610 &contents
[old_source_offset
]);
9612 case R_XTENSA_DIFF16
:
9614 bfd_put_signed_16 (abfd
, diff_value
,
9615 &contents
[old_source_offset
]);
9617 case R_XTENSA_DIFF32
:
9618 diff_mask
= 0x7fffffff;
9619 bfd_put_signed_32 (abfd
, diff_value
,
9620 &contents
[old_source_offset
]);
9624 /* Check for overflow. Sign bits must be all zeroes or all ones */
9625 if ((diff_value
& ~diff_mask
) != 0 &&
9626 (diff_value
& ~diff_mask
) != (-1 & ~diff_mask
))
9628 (*link_info
->callbacks
->reloc_dangerous
)
9629 (link_info
, _("overflow after relaxation"),
9630 abfd
, sec
, old_source_offset
);
9634 pin_contents (sec
, contents
);
9637 /* If the relocation still references a section in the same
9638 input file, modify the relocation directly instead of
9639 adding a "fix" record. */
9640 if (target_sec
->owner
== abfd
)
9642 unsigned r_symndx
= ELF32_R_SYM (new_reloc
.rela
.r_info
);
9643 irel
->r_info
= ELF32_R_INFO (r_symndx
, r_type
);
9644 irel
->r_addend
= new_reloc
.rela
.r_addend
;
9645 pin_internal_relocs (sec
, internal_relocs
);
9649 bfd_vma addend_displacement
;
9652 addend_displacement
=
9653 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
9654 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
,
9656 addend_displacement
, TRUE
);
9663 if ((relax_info
->is_relaxable_literal_section
9664 || relax_info
->is_relaxable_asm_section
)
9665 && action_list_count (&relax_info
->action_list
))
9667 /* Walk through the planned actions and build up a table
9668 of move, copy and fill records. Use the move, copy and
9669 fill records to perform the actions once. */
9671 bfd_size_type final_size
, copy_size
, orig_insn_size
;
9672 bfd_byte
*scratch
= NULL
;
9673 bfd_byte
*dup_contents
= NULL
;
9674 bfd_size_type orig_size
= sec
->size
;
9675 bfd_vma orig_dot
= 0;
9676 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
9677 orig dot in physical memory. */
9678 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
9679 bfd_vma dup_dot
= 0;
9681 text_action
*action
;
9683 final_size
= sec
->size
;
9685 splay_tree_foreach (relax_info
->action_list
.tree
,
9686 action_remove_bytes_fn
, &final_size
);
9687 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
9688 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
9690 /* The dot is the current fill location. */
9692 print_action_list (stderr
, &relax_info
->action_list
);
9695 for (action
= action_first (&relax_info
->action_list
); action
;
9696 action
= action_next (&relax_info
->action_list
, action
))
9698 virtual_action
= FALSE
;
9699 if (action
->offset
> orig_dot
)
9701 orig_dot
+= orig_dot_copied
;
9702 orig_dot_copied
= 0;
9704 /* Out of the virtual world. */
9707 if (action
->offset
> orig_dot
)
9709 copy_size
= action
->offset
- orig_dot
;
9710 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
9711 orig_dot
+= copy_size
;
9712 dup_dot
+= copy_size
;
9713 BFD_ASSERT (action
->offset
== orig_dot
);
9715 else if (action
->offset
< orig_dot
)
9717 if (action
->action
== ta_fill
9718 && action
->offset
- action
->removed_bytes
== orig_dot
)
9720 /* This is OK because the fill only effects the dup_dot. */
9722 else if (action
->action
== ta_add_literal
)
9724 /* TBD. Might need to handle this. */
9727 if (action
->offset
== orig_dot
)
9729 if (action
->virtual_offset
> orig_dot_vo
)
9731 if (orig_dot_vo
== 0)
9733 /* Need to copy virtual_offset bytes. Probably four. */
9734 copy_size
= action
->virtual_offset
- orig_dot_vo
;
9735 memmove (&dup_contents
[dup_dot
],
9736 &contents
[orig_dot
], copy_size
);
9737 orig_dot_copied
= copy_size
;
9738 dup_dot
+= copy_size
;
9740 virtual_action
= TRUE
;
9743 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
9745 switch (action
->action
)
9747 case ta_remove_literal
:
9748 case ta_remove_insn
:
9749 BFD_ASSERT (action
->removed_bytes
>= 0);
9750 orig_dot
+= action
->removed_bytes
;
9753 case ta_narrow_insn
:
9756 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
9757 BFD_ASSERT (action
->removed_bytes
== 1);
9758 rv
= narrow_instruction (scratch
, final_size
, 0);
9760 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
9761 orig_dot
+= orig_insn_size
;
9762 dup_dot
+= copy_size
;
9766 if (action
->removed_bytes
>= 0)
9767 orig_dot
+= action
->removed_bytes
;
9770 /* Already zeroed in dup_contents. Just bump the
9772 dup_dot
+= (-action
->removed_bytes
);
9777 BFD_ASSERT (action
->removed_bytes
== 0);
9780 case ta_convert_longcall
:
9781 case ta_remove_longcall
:
9782 /* These will be removed or converted before we get here. */
9789 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
9790 BFD_ASSERT (action
->removed_bytes
== -1);
9791 rv
= widen_instruction (scratch
, final_size
, 0);
9793 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
9794 orig_dot
+= orig_insn_size
;
9795 dup_dot
+= copy_size
;
9798 case ta_add_literal
:
9801 BFD_ASSERT (action
->removed_bytes
== -4);
9802 /* TBD -- place the literal value here and insert
9804 memset (&dup_contents
[dup_dot
], 0, 4);
9805 pin_internal_relocs (sec
, internal_relocs
);
9806 pin_contents (sec
, contents
);
9808 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
9809 relax_info
, &internal_relocs
, &action
->value
))
9813 orig_dot_vo
+= copy_size
;
9815 orig_dot
+= orig_insn_size
;
9816 dup_dot
+= copy_size
;
9820 /* Not implemented yet. */
9825 BFD_ASSERT (dup_dot
<= final_size
);
9826 BFD_ASSERT (orig_dot
<= orig_size
);
9829 orig_dot
+= orig_dot_copied
;
9830 orig_dot_copied
= 0;
9832 if (orig_dot
!= orig_size
)
9834 copy_size
= orig_size
- orig_dot
;
9835 BFD_ASSERT (orig_size
> orig_dot
);
9836 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
9837 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
9838 orig_dot
+= copy_size
;
9839 dup_dot
+= copy_size
;
9841 BFD_ASSERT (orig_size
== orig_dot
);
9842 BFD_ASSERT (final_size
== dup_dot
);
9844 /* Move the dup_contents back. */
9845 if (final_size
> orig_size
)
9847 /* Contents need to be reallocated. Swap the dup_contents into
9849 sec
->contents
= dup_contents
;
9851 contents
= dup_contents
;
9852 pin_contents (sec
, contents
);
9856 BFD_ASSERT (final_size
<= orig_size
);
9857 memset (contents
, 0, orig_size
);
9858 memcpy (contents
, dup_contents
, final_size
);
9859 free (dup_contents
);
9862 pin_contents (sec
, contents
);
9864 if (sec
->rawsize
== 0)
9865 sec
->rawsize
= sec
->size
;
9866 sec
->size
= final_size
;
9870 release_internal_relocs (sec
, internal_relocs
);
9871 release_contents (sec
, contents
);
9877 translate_section_fixes (asection
*sec
)
9879 xtensa_relax_info
*relax_info
;
9882 relax_info
= get_xtensa_relax_info (sec
);
9886 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
9887 if (!translate_reloc_bfd_fix (r
))
9894 /* Translate a fix given the mapping in the relax info for the target
9895 section. If it has already been translated, no work is required. */
9898 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
9900 reloc_bfd_fix new_fix
;
9902 xtensa_relax_info
*relax_info
;
9903 removed_literal
*removed
;
9904 bfd_vma new_offset
, target_offset
;
9906 if (fix
->translated
)
9909 sec
= fix
->target_sec
;
9910 target_offset
= fix
->target_offset
;
9912 relax_info
= get_xtensa_relax_info (sec
);
9915 fix
->translated
= TRUE
;
9921 /* The fix does not need to be translated if the section cannot change. */
9922 if (!relax_info
->is_relaxable_literal_section
9923 && !relax_info
->is_relaxable_asm_section
)
9925 fix
->translated
= TRUE
;
9929 /* If the literal has been moved and this relocation was on an
9930 opcode, then the relocation should move to the new literal
9931 location. Otherwise, the relocation should move within the
9935 if (is_operand_relocation (fix
->src_type
))
9937 /* Check if the original relocation is against a literal being
9939 removed
= find_removed_literal (&relax_info
->removed_list
,
9947 /* The fact that there is still a relocation to this literal indicates
9948 that the literal is being coalesced, not simply removed. */
9949 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
9951 /* This was moved to some other address (possibly another section). */
9952 new_sec
= r_reloc_get_section (&removed
->to
);
9956 relax_info
= get_xtensa_relax_info (sec
);
9958 (!relax_info
->is_relaxable_literal_section
9959 && !relax_info
->is_relaxable_asm_section
))
9961 target_offset
= removed
->to
.target_offset
;
9962 new_fix
.target_sec
= new_sec
;
9963 new_fix
.target_offset
= target_offset
;
9964 new_fix
.translated
= TRUE
;
9969 target_offset
= removed
->to
.target_offset
;
9970 new_fix
.target_sec
= new_sec
;
9973 /* The target address may have been moved within its section. */
9974 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
9977 new_fix
.target_offset
= new_offset
;
9978 new_fix
.target_offset
= new_offset
;
9979 new_fix
.translated
= TRUE
;
9985 /* Fix up a relocation to take account of removed literals. */
9988 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
, asection
*sec
)
9990 xtensa_relax_info
*relax_info
;
9991 removed_literal
*removed
;
9992 bfd_vma target_offset
, base_offset
;
9994 *new_rel
= *orig_rel
;
9996 if (!r_reloc_is_defined (orig_rel
))
9999 relax_info
= get_xtensa_relax_info (sec
);
10000 BFD_ASSERT (relax_info
&& (relax_info
->is_relaxable_literal_section
10001 || relax_info
->is_relaxable_asm_section
));
10003 target_offset
= orig_rel
->target_offset
;
10006 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
10008 /* Check if the original relocation is against a literal being
10010 removed
= find_removed_literal (&relax_info
->removed_list
,
10013 if (removed
&& removed
->to
.abfd
)
10017 /* The fact that there is still a relocation to this literal indicates
10018 that the literal is being coalesced, not simply removed. */
10019 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
10021 /* This was moved to some other address
10022 (possibly in another section). */
10023 *new_rel
= removed
->to
;
10024 new_sec
= r_reloc_get_section (new_rel
);
10025 if (new_sec
!= sec
)
10028 relax_info
= get_xtensa_relax_info (sec
);
10030 || (!relax_info
->is_relaxable_literal_section
10031 && !relax_info
->is_relaxable_asm_section
))
10034 target_offset
= new_rel
->target_offset
;
10037 /* Find the base offset of the reloc symbol, excluding any addend from the
10038 reloc or from the section contents (for a partial_inplace reloc). Then
10039 find the adjusted values of the offsets due to relaxation. The base
10040 offset is needed to determine the change to the reloc's addend; the reloc
10041 addend should not be adjusted due to relaxations located before the base
10044 base_offset
= r_reloc_get_target_offset (new_rel
) - new_rel
->rela
.r_addend
;
10045 if (base_offset
<= target_offset
)
10047 int base_removed
= removed_by_actions_map (&relax_info
->action_list
,
10048 base_offset
, FALSE
);
10049 int addend_removed
= removed_by_actions_map (&relax_info
->action_list
,
10050 target_offset
, FALSE
) -
10053 new_rel
->target_offset
= target_offset
- base_removed
- addend_removed
;
10054 new_rel
->rela
.r_addend
-= addend_removed
;
10058 /* Handle a negative addend. The base offset comes first. */
10059 int tgt_removed
= removed_by_actions_map (&relax_info
->action_list
,
10060 target_offset
, FALSE
);
10061 int addend_removed
= removed_by_actions_map (&relax_info
->action_list
,
10062 base_offset
, FALSE
) -
10065 new_rel
->target_offset
= target_offset
- tgt_removed
;
10066 new_rel
->rela
.r_addend
+= addend_removed
;
10073 /* For dynamic links, there may be a dynamic relocation for each
10074 literal. The number of dynamic relocations must be computed in
10075 size_dynamic_sections, which occurs before relaxation. When a
10076 literal is removed, this function checks if there is a corresponding
10077 dynamic relocation and shrinks the size of the appropriate dynamic
10078 relocation section accordingly. At this point, the contents of the
10079 dynamic relocation sections have not yet been filled in, so there's
10080 nothing else that needs to be done. */
10083 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
10085 asection
*input_section
,
10086 Elf_Internal_Rela
*rel
)
10088 struct elf_xtensa_link_hash_table
*htab
;
10089 Elf_Internal_Shdr
*symtab_hdr
;
10090 struct elf_link_hash_entry
**sym_hashes
;
10091 unsigned long r_symndx
;
10093 struct elf_link_hash_entry
*h
;
10094 bfd_boolean dynamic_symbol
;
10096 htab
= elf_xtensa_hash_table (info
);
10100 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10101 sym_hashes
= elf_sym_hashes (abfd
);
10103 r_type
= ELF32_R_TYPE (rel
->r_info
);
10104 r_symndx
= ELF32_R_SYM (rel
->r_info
);
10106 if (r_symndx
< symtab_hdr
->sh_info
)
10109 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
10111 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
10113 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
10114 && (input_section
->flags
& SEC_ALLOC
) != 0
10115 && (dynamic_symbol
|| bfd_link_pic (info
)))
10118 bfd_boolean is_plt
= FALSE
;
10120 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
10122 srel
= htab
->srelplt
;
10126 srel
= htab
->srelgot
;
10128 /* Reduce size of the .rela.* section by one reloc. */
10129 BFD_ASSERT (srel
!= NULL
);
10130 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
10131 srel
->size
-= sizeof (Elf32_External_Rela
);
10135 asection
*splt
, *sgotplt
, *srelgot
;
10136 int reloc_index
, chunk
;
10138 /* Find the PLT reloc index of the entry being removed. This
10139 is computed from the size of ".rela.plt". It is needed to
10140 figure out which PLT chunk to resize. Usually "last index
10141 = size - 1" since the index starts at zero, but in this
10142 context, the size has just been decremented so there's no
10143 need to subtract one. */
10144 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
10146 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
10147 splt
= elf_xtensa_get_plt_section (info
, chunk
);
10148 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
10149 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
10151 /* Check if an entire PLT chunk has just been eliminated. */
10152 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
10154 /* The two magic GOT entries for that chunk can go away. */
10155 srelgot
= htab
->srelgot
;
10156 BFD_ASSERT (srelgot
!= NULL
);
10157 srelgot
->reloc_count
-= 2;
10158 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
10159 sgotplt
->size
-= 8;
10161 /* There should be only one entry left (and it will be
10163 BFD_ASSERT (sgotplt
->size
== 4);
10164 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
10167 BFD_ASSERT (sgotplt
->size
>= 4);
10168 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
10170 sgotplt
->size
-= 4;
10171 splt
->size
-= PLT_ENTRY_SIZE
;
10177 /* Take an r_rel and move it to another section. This usually
10178 requires extending the interal_relocation array and pinning it. If
10179 the original r_rel is from the same BFD, we can complete this here.
10180 Otherwise, we add a fix record to let the final link fix the
10181 appropriate address. Contents and internal relocations for the
10182 section must be pinned after calling this routine. */
10185 move_literal (bfd
*abfd
,
10186 struct bfd_link_info
*link_info
,
10189 bfd_byte
*contents
,
10190 xtensa_relax_info
*relax_info
,
10191 Elf_Internal_Rela
**internal_relocs_p
,
10192 const literal_value
*lit
)
10194 Elf_Internal_Rela
*new_relocs
= NULL
;
10195 size_t new_relocs_count
= 0;
10196 Elf_Internal_Rela this_rela
;
10197 const r_reloc
*r_rel
;
10199 r_rel
= &lit
->r_rel
;
10200 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
10202 if (r_reloc_is_const (r_rel
))
10203 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
10208 reloc_bfd_fix
*fix
;
10209 unsigned insert_at
;
10211 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
10213 /* This is the difficult case. We have to create a fix up. */
10214 this_rela
.r_offset
= offset
;
10215 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
10216 this_rela
.r_addend
=
10217 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
10218 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
10220 /* Currently, we cannot move relocations during a relocatable link. */
10221 BFD_ASSERT (!bfd_link_relocatable (link_info
));
10222 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
,
10223 r_reloc_get_section (r_rel
),
10224 r_rel
->target_offset
+ r_rel
->virtual_offset
,
10226 /* We also need to mark that relocations are needed here. */
10227 sec
->flags
|= SEC_RELOC
;
10229 translate_reloc_bfd_fix (fix
);
10230 /* This fix has not yet been translated. */
10231 add_fix (sec
, fix
);
10233 /* Add the relocation. If we have already allocated our own
10234 space for the relocations and we have room for more, then use
10235 it. Otherwise, allocate new space and move the literals. */
10236 insert_at
= sec
->reloc_count
;
10237 for (i
= 0; i
< sec
->reloc_count
; ++i
)
10239 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
10246 if (*internal_relocs_p
!= relax_info
->allocated_relocs
10247 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
10249 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
10250 || sec
->reloc_count
== relax_info
->relocs_count
);
10252 if (relax_info
->allocated_relocs_count
== 0)
10253 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
10255 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
10257 new_relocs
= (Elf_Internal_Rela
*)
10258 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
10262 /* We could handle this more quickly by finding the split point. */
10263 if (insert_at
!= 0)
10264 memcpy (new_relocs
, *internal_relocs_p
,
10265 insert_at
* sizeof (Elf_Internal_Rela
));
10267 new_relocs
[insert_at
] = this_rela
;
10269 if (insert_at
!= sec
->reloc_count
)
10270 memcpy (new_relocs
+ insert_at
+ 1,
10271 (*internal_relocs_p
) + insert_at
,
10272 (sec
->reloc_count
- insert_at
)
10273 * sizeof (Elf_Internal_Rela
));
10275 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
10277 /* The first time we re-allocate, we can only free the
10278 old relocs if they were allocated with bfd_malloc.
10279 This is not true when keep_memory is in effect. */
10280 if (!link_info
->keep_memory
)
10281 free (*internal_relocs_p
);
10284 free (*internal_relocs_p
);
10285 relax_info
->allocated_relocs
= new_relocs
;
10286 relax_info
->allocated_relocs_count
= new_relocs_count
;
10287 elf_section_data (sec
)->relocs
= new_relocs
;
10288 sec
->reloc_count
++;
10289 relax_info
->relocs_count
= sec
->reloc_count
;
10290 *internal_relocs_p
= new_relocs
;
10294 if (insert_at
!= sec
->reloc_count
)
10297 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
10298 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
10300 (*internal_relocs_p
)[insert_at
] = this_rela
;
10301 sec
->reloc_count
++;
10302 if (relax_info
->allocated_relocs
)
10303 relax_info
->relocs_count
= sec
->reloc_count
;
10310 /* This is similar to relax_section except that when a target is moved,
10311 we shift addresses up. We also need to modify the size. This
10312 algorithm does NOT allow for relocations into the middle of the
10313 property sections. */
10316 relax_property_section (bfd
*abfd
,
10318 struct bfd_link_info
*link_info
)
10320 Elf_Internal_Rela
*internal_relocs
;
10321 bfd_byte
*contents
;
10323 bfd_boolean ok
= TRUE
;
10324 bfd_boolean is_full_prop_section
;
10325 size_t last_zfill_target_offset
= 0;
10326 asection
*last_zfill_target_sec
= NULL
;
10327 bfd_size_type sec_size
;
10328 bfd_size_type entry_size
;
10330 sec_size
= bfd_get_section_limit (abfd
, sec
);
10331 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
10332 link_info
->keep_memory
);
10333 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
10334 if (contents
== NULL
&& sec_size
!= 0)
10340 is_full_prop_section
= xtensa_is_proptable_section (sec
);
10341 if (is_full_prop_section
)
10346 if (internal_relocs
)
10348 for (i
= 0; i
< sec
->reloc_count
; i
++)
10350 Elf_Internal_Rela
*irel
;
10351 xtensa_relax_info
*target_relax_info
;
10353 asection
*target_sec
;
10355 bfd_byte
*size_p
, *flags_p
;
10357 /* Locally change the source address.
10358 Translate the target to the new target address.
10359 If it points to this section and has been removed, MOVE IT.
10360 Also, don't forget to modify the associated SIZE at
10363 irel
= &internal_relocs
[i
];
10364 r_type
= ELF32_R_TYPE (irel
->r_info
);
10365 if (r_type
== R_XTENSA_NONE
)
10368 /* Find the literal value. */
10369 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
10370 size_p
= &contents
[irel
->r_offset
+ 4];
10372 if (is_full_prop_section
)
10373 flags_p
= &contents
[irel
->r_offset
+ 8];
10374 BFD_ASSERT (irel
->r_offset
+ entry_size
<= sec_size
);
10376 target_sec
= r_reloc_get_section (&val
.r_rel
);
10377 target_relax_info
= get_xtensa_relax_info (target_sec
);
10379 if (target_relax_info
10380 && (target_relax_info
->is_relaxable_literal_section
10381 || target_relax_info
->is_relaxable_asm_section
))
10383 /* Translate the relocation's destination. */
10384 bfd_vma old_offset
= val
.r_rel
.target_offset
;
10385 bfd_vma new_offset
;
10386 long old_size
, new_size
;
10387 int removed_by_old_offset
=
10388 removed_by_actions_map (&target_relax_info
->action_list
,
10389 old_offset
, FALSE
);
10390 new_offset
= old_offset
- removed_by_old_offset
;
10392 /* Assert that we are not out of bounds. */
10393 old_size
= bfd_get_32 (abfd
, size_p
);
10394 new_size
= old_size
;
10398 /* Only the first zero-sized unreachable entry is
10399 allowed to expand. In this case the new offset
10400 should be the offset before the fill and the new
10401 size is the expansion size. For other zero-sized
10402 entries the resulting size should be zero with an
10403 offset before or after the fill address depending
10404 on whether the expanding unreachable entry
10406 if (last_zfill_target_sec
== 0
10407 || last_zfill_target_sec
!= target_sec
10408 || last_zfill_target_offset
!= old_offset
)
10410 bfd_vma new_end_offset
= new_offset
;
10412 /* Recompute the new_offset, but this time don't
10413 include any fill inserted by relaxation. */
10414 removed_by_old_offset
=
10415 removed_by_actions_map (&target_relax_info
->action_list
,
10417 new_offset
= old_offset
- removed_by_old_offset
;
10419 /* If it is not unreachable and we have not yet
10420 seen an unreachable at this address, place it
10421 before the fill address. */
10422 if (flags_p
&& (bfd_get_32 (abfd
, flags_p
)
10423 & XTENSA_PROP_UNREACHABLE
) != 0)
10425 new_size
= new_end_offset
- new_offset
;
10427 last_zfill_target_sec
= target_sec
;
10428 last_zfill_target_offset
= old_offset
;
10434 int removed_by_old_offset_size
=
10435 removed_by_actions_map (&target_relax_info
->action_list
,
10436 old_offset
+ old_size
, TRUE
);
10437 new_size
-= removed_by_old_offset_size
- removed_by_old_offset
;
10440 if (new_size
!= old_size
)
10442 bfd_put_32 (abfd
, new_size
, size_p
);
10443 pin_contents (sec
, contents
);
10446 if (new_offset
!= old_offset
)
10448 bfd_vma diff
= new_offset
- old_offset
;
10449 irel
->r_addend
+= diff
;
10450 pin_internal_relocs (sec
, internal_relocs
);
10456 /* Combine adjacent property table entries. This is also done in
10457 finish_dynamic_sections() but at that point it's too late to
10458 reclaim the space in the output section, so we do this twice. */
10460 if (internal_relocs
&& (!bfd_link_relocatable (link_info
)
10461 || xtensa_is_littable_section (sec
)))
10463 Elf_Internal_Rela
*last_irel
= NULL
;
10464 Elf_Internal_Rela
*irel
, *next_rel
, *rel_end
;
10465 int removed_bytes
= 0;
10467 flagword predef_flags
;
10469 predef_flags
= xtensa_get_property_predef_flags (sec
);
10471 /* Walk over memory and relocations at the same time.
10472 This REQUIRES that the internal_relocs be sorted by offset. */
10473 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
10474 internal_reloc_compare
);
10476 pin_internal_relocs (sec
, internal_relocs
);
10477 pin_contents (sec
, contents
);
10479 next_rel
= internal_relocs
;
10480 rel_end
= internal_relocs
+ sec
->reloc_count
;
10482 BFD_ASSERT (sec
->size
% entry_size
== 0);
10484 for (offset
= 0; offset
< sec
->size
; offset
+= entry_size
)
10486 Elf_Internal_Rela
*offset_rel
, *extra_rel
;
10487 bfd_vma bytes_to_remove
, size
, actual_offset
;
10488 bfd_boolean remove_this_rel
;
10491 /* Find the first relocation for the entry at the current offset.
10492 Adjust the offsets of any extra relocations for the previous
10497 for (irel
= next_rel
; irel
< rel_end
; irel
++)
10499 if ((irel
->r_offset
== offset
10500 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
10501 || irel
->r_offset
> offset
)
10506 irel
->r_offset
-= removed_bytes
;
10510 /* Find the next relocation (if there are any left). */
10514 for (irel
= offset_rel
+ 1; irel
< rel_end
; irel
++)
10516 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
10524 /* Check if there are relocations on the current entry. There
10525 should usually be a relocation on the offset field. If there
10526 are relocations on the size or flags, then we can't optimize
10527 this entry. Also, find the next relocation to examine on the
10531 if (offset_rel
->r_offset
>= offset
+ entry_size
)
10533 next_rel
= offset_rel
;
10534 /* There are no relocations on the current entry, but we
10535 might still be able to remove it if the size is zero. */
10538 else if (offset_rel
->r_offset
> offset
10540 && extra_rel
->r_offset
< offset
+ entry_size
))
10542 /* There is a relocation on the size or flags, so we can't
10543 do anything with this entry. Continue with the next. */
10544 next_rel
= offset_rel
;
10549 BFD_ASSERT (offset_rel
->r_offset
== offset
);
10550 offset_rel
->r_offset
-= removed_bytes
;
10551 next_rel
= offset_rel
+ 1;
10557 remove_this_rel
= FALSE
;
10558 bytes_to_remove
= 0;
10559 actual_offset
= offset
- removed_bytes
;
10560 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
10562 if (is_full_prop_section
)
10563 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
10565 flags
= predef_flags
;
10568 && (flags
& XTENSA_PROP_ALIGN
) == 0
10569 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
10571 /* Always remove entries with zero size and no alignment. */
10572 bytes_to_remove
= entry_size
;
10574 remove_this_rel
= TRUE
;
10576 else if (offset_rel
10577 && ELF32_R_TYPE (offset_rel
->r_info
) == R_XTENSA_32
)
10581 flagword old_flags
;
10583 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
10584 bfd_vma old_address
=
10585 (last_irel
->r_addend
10586 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
10587 bfd_vma new_address
=
10588 (offset_rel
->r_addend
10589 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
10590 if (is_full_prop_section
)
10591 old_flags
= bfd_get_32
10592 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
10594 old_flags
= predef_flags
;
10596 if ((ELF32_R_SYM (offset_rel
->r_info
)
10597 == ELF32_R_SYM (last_irel
->r_info
))
10598 && old_address
+ old_size
== new_address
10599 && old_flags
== flags
10600 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
10601 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
10603 /* Fix the old size. */
10604 bfd_put_32 (abfd
, old_size
+ size
,
10605 &contents
[last_irel
->r_offset
+ 4]);
10606 bytes_to_remove
= entry_size
;
10607 remove_this_rel
= TRUE
;
10610 last_irel
= offset_rel
;
10613 last_irel
= offset_rel
;
10616 if (remove_this_rel
)
10618 offset_rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
10619 offset_rel
->r_offset
= 0;
10622 if (bytes_to_remove
!= 0)
10624 removed_bytes
+= bytes_to_remove
;
10625 if (offset
+ bytes_to_remove
< sec
->size
)
10626 memmove (&contents
[actual_offset
],
10627 &contents
[actual_offset
+ bytes_to_remove
],
10628 sec
->size
- offset
- bytes_to_remove
);
10634 /* Fix up any extra relocations on the last entry. */
10635 for (irel
= next_rel
; irel
< rel_end
; irel
++)
10636 irel
->r_offset
-= removed_bytes
;
10638 /* Clear the removed bytes. */
10639 memset (&contents
[sec
->size
- removed_bytes
], 0, removed_bytes
);
10641 if (sec
->rawsize
== 0)
10642 sec
->rawsize
= sec
->size
;
10643 sec
->size
-= removed_bytes
;
10645 if (xtensa_is_littable_section (sec
))
10647 asection
*sgotloc
= elf_xtensa_hash_table (link_info
)->sgotloc
;
10649 sgotloc
->size
-= removed_bytes
;
10655 release_internal_relocs (sec
, internal_relocs
);
10656 release_contents (sec
, contents
);
10661 /* Third relaxation pass. */
10663 /* Change symbol values to account for removed literals. */
10666 relax_section_symbols (bfd
*abfd
, asection
*sec
)
10668 xtensa_relax_info
*relax_info
;
10669 unsigned int sec_shndx
;
10670 Elf_Internal_Shdr
*symtab_hdr
;
10671 Elf_Internal_Sym
*isymbuf
;
10672 unsigned i
, num_syms
, num_locals
;
10674 relax_info
= get_xtensa_relax_info (sec
);
10675 BFD_ASSERT (relax_info
);
10677 if (!relax_info
->is_relaxable_literal_section
10678 && !relax_info
->is_relaxable_asm_section
)
10681 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
10683 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10684 isymbuf
= retrieve_local_syms (abfd
);
10686 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
10687 num_locals
= symtab_hdr
->sh_info
;
10689 /* Adjust the local symbols defined in this section. */
10690 for (i
= 0; i
< num_locals
; i
++)
10692 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
10694 if (isym
->st_shndx
== sec_shndx
)
10696 bfd_vma orig_addr
= isym
->st_value
;
10697 int removed
= removed_by_actions_map (&relax_info
->action_list
,
10700 isym
->st_value
-= removed
;
10701 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
10703 removed_by_actions_map (&relax_info
->action_list
,
10704 orig_addr
+ isym
->st_size
, FALSE
) -
10709 /* Now adjust the global symbols defined in this section. */
10710 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
10712 struct elf_link_hash_entry
*sym_hash
;
10714 sym_hash
= elf_sym_hashes (abfd
)[i
];
10716 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
10717 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
10719 if ((sym_hash
->root
.type
== bfd_link_hash_defined
10720 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
10721 && sym_hash
->root
.u
.def
.section
== sec
)
10723 bfd_vma orig_addr
= sym_hash
->root
.u
.def
.value
;
10724 int removed
= removed_by_actions_map (&relax_info
->action_list
,
10727 sym_hash
->root
.u
.def
.value
-= removed
;
10729 if (sym_hash
->type
== STT_FUNC
)
10731 removed_by_actions_map (&relax_info
->action_list
,
10732 orig_addr
+ sym_hash
->size
, FALSE
) -
10741 /* "Fix" handling functions, called while performing relocations. */
10744 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
10746 asection
*input_section
,
10747 bfd_byte
*contents
)
10750 asection
*sec
, *old_sec
;
10751 bfd_vma old_offset
;
10752 int r_type
= ELF32_R_TYPE (rel
->r_info
);
10753 reloc_bfd_fix
*fix
;
10755 if (r_type
== R_XTENSA_NONE
)
10758 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
10762 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
10763 bfd_get_section_limit (input_bfd
, input_section
));
10764 old_sec
= r_reloc_get_section (&r_rel
);
10765 old_offset
= r_rel
.target_offset
;
10767 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
10769 if (r_type
!= R_XTENSA_ASM_EXPAND
)
10771 (*_bfd_error_handler
)
10772 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
10773 input_bfd
, input_section
, rel
->r_offset
,
10774 elf_howto_table
[r_type
].name
);
10777 /* Leave it be. Resolution will happen in a later stage. */
10781 sec
= fix
->target_sec
;
10782 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
10783 - (old_sec
->output_offset
+ old_offset
));
10790 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
10792 asection
*input_section
,
10793 bfd_byte
*contents
,
10794 bfd_vma
*relocationp
)
10797 int r_type
= ELF32_R_TYPE (rel
->r_info
);
10798 reloc_bfd_fix
*fix
;
10799 bfd_vma fixup_diff
;
10801 if (r_type
== R_XTENSA_NONE
)
10804 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
10808 sec
= fix
->target_sec
;
10810 fixup_diff
= rel
->r_addend
;
10811 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
10813 bfd_vma inplace_val
;
10814 BFD_ASSERT (fix
->src_offset
10815 < bfd_get_section_limit (input_bfd
, input_section
));
10816 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
10817 fixup_diff
+= inplace_val
;
10820 *relocationp
= (sec
->output_section
->vma
10821 + sec
->output_offset
10822 + fix
->target_offset
- fixup_diff
);
10826 /* Miscellaneous utility functions.... */
10829 elf_xtensa_get_plt_section (struct bfd_link_info
*info
, int chunk
)
10831 struct elf_xtensa_link_hash_table
*htab
;
10837 htab
= elf_xtensa_hash_table (info
);
10844 dynobj
= elf_hash_table (info
)->dynobj
;
10845 sprintf (plt_name
, ".plt.%u", chunk
);
10846 return bfd_get_linker_section (dynobj
, plt_name
);
10851 elf_xtensa_get_gotplt_section (struct bfd_link_info
*info
, int chunk
)
10853 struct elf_xtensa_link_hash_table
*htab
;
10859 htab
= elf_xtensa_hash_table (info
);
10862 return htab
->sgotplt
;
10865 dynobj
= elf_hash_table (info
)->dynobj
;
10866 sprintf (got_name
, ".got.plt.%u", chunk
);
10867 return bfd_get_linker_section (dynobj
, got_name
);
10871 /* Get the input section for a given symbol index.
10873 . a section symbol, return the section;
10874 . a common symbol, return the common section;
10875 . an undefined symbol, return the undefined section;
10876 . an indirect symbol, follow the links;
10877 . an absolute value, return the absolute section. */
10880 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
10882 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10883 asection
*target_sec
= NULL
;
10884 if (r_symndx
< symtab_hdr
->sh_info
)
10886 Elf_Internal_Sym
*isymbuf
;
10887 unsigned int section_index
;
10889 isymbuf
= retrieve_local_syms (abfd
);
10890 section_index
= isymbuf
[r_symndx
].st_shndx
;
10892 if (section_index
== SHN_UNDEF
)
10893 target_sec
= bfd_und_section_ptr
;
10894 else if (section_index
== SHN_ABS
)
10895 target_sec
= bfd_abs_section_ptr
;
10896 else if (section_index
== SHN_COMMON
)
10897 target_sec
= bfd_com_section_ptr
;
10899 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
10903 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
10904 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
10906 while (h
->root
.type
== bfd_link_hash_indirect
10907 || h
->root
.type
== bfd_link_hash_warning
)
10908 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10910 switch (h
->root
.type
)
10912 case bfd_link_hash_defined
:
10913 case bfd_link_hash_defweak
:
10914 target_sec
= h
->root
.u
.def
.section
;
10916 case bfd_link_hash_common
:
10917 target_sec
= bfd_com_section_ptr
;
10919 case bfd_link_hash_undefined
:
10920 case bfd_link_hash_undefweak
:
10921 target_sec
= bfd_und_section_ptr
;
10923 default: /* New indirect warning. */
10924 target_sec
= bfd_und_section_ptr
;
10932 static struct elf_link_hash_entry
*
10933 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
10935 unsigned long indx
;
10936 struct elf_link_hash_entry
*h
;
10937 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10939 if (r_symndx
< symtab_hdr
->sh_info
)
10942 indx
= r_symndx
- symtab_hdr
->sh_info
;
10943 h
= elf_sym_hashes (abfd
)[indx
];
10944 while (h
->root
.type
== bfd_link_hash_indirect
10945 || h
->root
.type
== bfd_link_hash_warning
)
10946 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10951 /* Get the section-relative offset for a symbol number. */
10954 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
10956 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10957 bfd_vma offset
= 0;
10959 if (r_symndx
< symtab_hdr
->sh_info
)
10961 Elf_Internal_Sym
*isymbuf
;
10962 isymbuf
= retrieve_local_syms (abfd
);
10963 offset
= isymbuf
[r_symndx
].st_value
;
10967 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
10968 struct elf_link_hash_entry
*h
=
10969 elf_sym_hashes (abfd
)[indx
];
10971 while (h
->root
.type
== bfd_link_hash_indirect
10972 || h
->root
.type
== bfd_link_hash_warning
)
10973 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10974 if (h
->root
.type
== bfd_link_hash_defined
10975 || h
->root
.type
== bfd_link_hash_defweak
)
10976 offset
= h
->root
.u
.def
.value
;
10983 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
10985 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
10986 struct elf_link_hash_entry
*h
;
10988 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
10989 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
10996 pcrel_reloc_fits (xtensa_opcode opc
,
10998 bfd_vma self_address
,
10999 bfd_vma dest_address
)
11001 xtensa_isa isa
= xtensa_default_isa
;
11002 uint32 valp
= dest_address
;
11003 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
11004 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
11011 xtensa_is_property_section (asection
*sec
)
11013 if (xtensa_is_insntable_section (sec
)
11014 || xtensa_is_littable_section (sec
)
11015 || xtensa_is_proptable_section (sec
))
11023 xtensa_is_insntable_section (asection
*sec
)
11025 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
11026 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
11034 xtensa_is_littable_section (asection
*sec
)
11036 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
11037 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.p."))
11045 xtensa_is_proptable_section (asection
*sec
)
11047 if (CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
11048 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."))
11056 internal_reloc_compare (const void *ap
, const void *bp
)
11058 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
11059 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
11061 if (a
->r_offset
!= b
->r_offset
)
11062 return (a
->r_offset
- b
->r_offset
);
11064 /* We don't need to sort on these criteria for correctness,
11065 but enforcing a more strict ordering prevents unstable qsort
11066 from behaving differently with different implementations.
11067 Without the code below we get correct but different results
11068 on Solaris 2.7 and 2.8. We would like to always produce the
11069 same results no matter the host. */
11071 if (a
->r_info
!= b
->r_info
)
11072 return (a
->r_info
- b
->r_info
);
11074 return (a
->r_addend
- b
->r_addend
);
11079 internal_reloc_matches (const void *ap
, const void *bp
)
11081 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
11082 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
11084 /* Check if one entry overlaps with the other; this shouldn't happen
11085 except when searching for a match. */
11086 return (a
->r_offset
- b
->r_offset
);
11090 /* Predicate function used to look up a section in a particular group. */
11093 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
11095 const char *gname
= inf
;
11096 const char *group_name
= elf_group_name (sec
);
11098 return (group_name
== gname
11099 || (group_name
!= NULL
11101 && strcmp (group_name
, gname
) == 0));
11105 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
11108 xtensa_property_section_name (asection
*sec
, const char *base_name
)
11110 const char *suffix
, *group_name
;
11111 char *prop_sec_name
;
11113 group_name
= elf_group_name (sec
);
11116 suffix
= strrchr (sec
->name
, '.');
11117 if (suffix
== sec
->name
)
11119 prop_sec_name
= (char *) bfd_malloc (strlen (base_name
) + 1
11120 + (suffix
? strlen (suffix
) : 0));
11121 strcpy (prop_sec_name
, base_name
);
11123 strcat (prop_sec_name
, suffix
);
11125 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
11127 char *linkonce_kind
= 0;
11129 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
11130 linkonce_kind
= "x.";
11131 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
11132 linkonce_kind
= "p.";
11133 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
11134 linkonce_kind
= "prop.";
11138 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
11139 + strlen (linkonce_kind
) + 1);
11140 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
11141 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
11143 suffix
= sec
->name
+ linkonce_len
;
11144 /* For backward compatibility, replace "t." instead of inserting
11145 the new linkonce_kind (but not for "prop" sections). */
11146 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
11148 strcat (prop_sec_name
+ linkonce_len
, suffix
);
11151 prop_sec_name
= strdup (base_name
);
11153 return prop_sec_name
;
11158 xtensa_get_property_section (asection
*sec
, const char *base_name
)
11160 char *prop_sec_name
;
11161 asection
*prop_sec
;
11163 prop_sec_name
= xtensa_property_section_name (sec
, base_name
);
11164 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
11165 match_section_group
,
11166 (void *) elf_group_name (sec
));
11167 free (prop_sec_name
);
11173 xtensa_make_property_section (asection
*sec
, const char *base_name
)
11175 char *prop_sec_name
;
11176 asection
*prop_sec
;
11178 /* Check if the section already exists. */
11179 prop_sec_name
= xtensa_property_section_name (sec
, base_name
);
11180 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
11181 match_section_group
,
11182 (void *) elf_group_name (sec
));
11183 /* If not, create it. */
11186 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
11187 flags
|= (bfd_get_section_flags (sec
->owner
, sec
)
11188 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
11190 prop_sec
= bfd_make_section_anyway_with_flags
11191 (sec
->owner
, strdup (prop_sec_name
), flags
);
11195 elf_group_name (prop_sec
) = elf_group_name (sec
);
11198 free (prop_sec_name
);
11204 xtensa_get_property_predef_flags (asection
*sec
)
11206 if (xtensa_is_insntable_section (sec
))
11207 return (XTENSA_PROP_INSN
11208 | XTENSA_PROP_NO_TRANSFORM
11209 | XTENSA_PROP_INSN_NO_REORDER
);
11211 if (xtensa_is_littable_section (sec
))
11212 return (XTENSA_PROP_LITERAL
11213 | XTENSA_PROP_NO_TRANSFORM
11214 | XTENSA_PROP_INSN_NO_REORDER
);
11220 /* Other functions called directly by the linker. */
11223 xtensa_callback_required_dependence (bfd
*abfd
,
11225 struct bfd_link_info
*link_info
,
11226 deps_callback_t callback
,
11229 Elf_Internal_Rela
*internal_relocs
;
11230 bfd_byte
*contents
;
11232 bfd_boolean ok
= TRUE
;
11233 bfd_size_type sec_size
;
11235 sec_size
= bfd_get_section_limit (abfd
, sec
);
11237 /* ".plt*" sections have no explicit relocations but they contain L32R
11238 instructions that reference the corresponding ".got.plt*" sections. */
11239 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
11240 && CONST_STRNEQ (sec
->name
, ".plt"))
11244 /* Find the corresponding ".got.plt*" section. */
11245 if (sec
->name
[4] == '\0')
11246 sgotplt
= bfd_get_linker_section (sec
->owner
, ".got.plt");
11252 BFD_ASSERT (sec
->name
[4] == '.');
11253 chunk
= strtol (&sec
->name
[5], NULL
, 10);
11255 sprintf (got_name
, ".got.plt.%u", chunk
);
11256 sgotplt
= bfd_get_linker_section (sec
->owner
, got_name
);
11258 BFD_ASSERT (sgotplt
);
11260 /* Assume worst-case offsets: L32R at the very end of the ".plt"
11261 section referencing a literal at the very beginning of
11262 ".got.plt". This is very close to the real dependence, anyway. */
11263 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
11266 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
11267 when building uclibc, which runs "ld -b binary /dev/null". */
11268 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
11271 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
11272 link_info
->keep_memory
);
11273 if (internal_relocs
== NULL
11274 || sec
->reloc_count
== 0)
11277 /* Cache the contents for the duration of this scan. */
11278 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
11279 if (contents
== NULL
&& sec_size
!= 0)
11285 if (!xtensa_default_isa
)
11286 xtensa_default_isa
= xtensa_isa_init (0, 0);
11288 for (i
= 0; i
< sec
->reloc_count
; i
++)
11290 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
11291 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
11294 asection
*target_sec
;
11295 bfd_vma target_offset
;
11297 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
11300 /* L32Rs must be local to the input file. */
11301 if (r_reloc_is_defined (&l32r_rel
))
11303 target_sec
= r_reloc_get_section (&l32r_rel
);
11304 target_offset
= l32r_rel
.target_offset
;
11306 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
11312 release_internal_relocs (sec
, internal_relocs
);
11313 release_contents (sec
, contents
);
11317 /* The default literal sections should always be marked as "code" (i.e.,
11318 SHF_EXECINSTR). This is particularly important for the Linux kernel
11319 module loader so that the literals are not placed after the text. */
11320 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
11322 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11323 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11324 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
11325 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE
, 0 },
11326 { NULL
, 0, 0, 0, 0 }
11329 #define ELF_TARGET_ID XTENSA_ELF_DATA
11331 #define TARGET_LITTLE_SYM xtensa_elf32_le_vec
11332 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
11333 #define TARGET_BIG_SYM xtensa_elf32_be_vec
11334 #define TARGET_BIG_NAME "elf32-xtensa-be"
11335 #define ELF_ARCH bfd_arch_xtensa
11337 #define ELF_MACHINE_CODE EM_XTENSA
11338 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
11341 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
11342 #else /* !XCHAL_HAVE_MMU */
11343 #define ELF_MAXPAGESIZE 1
11344 #endif /* !XCHAL_HAVE_MMU */
11345 #endif /* ELF_ARCH */
11347 #define elf_backend_can_gc_sections 1
11348 #define elf_backend_can_refcount 1
11349 #define elf_backend_plt_readonly 1
11350 #define elf_backend_got_header_size 4
11351 #define elf_backend_want_dynbss 0
11352 #define elf_backend_want_got_plt 1
11354 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
11356 #define bfd_elf32_mkobject elf_xtensa_mkobject
11358 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
11359 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
11360 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
11361 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
11362 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
11363 #define bfd_elf32_bfd_reloc_name_lookup \
11364 elf_xtensa_reloc_name_lookup
11365 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
11366 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
11368 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
11369 #define elf_backend_check_relocs elf_xtensa_check_relocs
11370 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
11371 #define elf_backend_discard_info elf_xtensa_discard_info
11372 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
11373 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
11374 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
11375 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
11376 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
11377 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
11378 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
11379 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
11380 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
11381 #define elf_backend_object_p elf_xtensa_object_p
11382 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
11383 #define elf_backend_relocate_section elf_xtensa_relocate_section
11384 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
11385 #define elf_backend_always_size_sections elf_xtensa_always_size_sections
11386 #define elf_backend_omit_section_dynsym \
11387 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
11388 #define elf_backend_special_sections elf_xtensa_special_sections
11389 #define elf_backend_action_discarded elf_xtensa_action_discarded
11390 #define elf_backend_copy_indirect_symbol elf_xtensa_copy_indirect_symbol
11392 #include "elf32-target.h"