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a85d7ed0 | 1 | /* IBM S/390-specific support for 64-bit ELF |
7898deda | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
a85d7ed0 NC |
3 | Contributed Martin Schwidefsky (schwidefsky@de.ibm.com). |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include "bfd.h" | |
23 | #include "sysdep.h" | |
24 | #include "bfdlink.h" | |
25 | #include "libbfd.h" | |
26 | #include "elf-bfd.h" | |
27 | ||
28 | static reloc_howto_type *elf_s390_reloc_type_lookup | |
29 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
30 | static void elf_s390_info_to_howto | |
31 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); | |
32 | static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *)); | |
33 | static struct bfd_hash_entry *elf_s390_link_hash_newfunc | |
34 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
35 | static struct bfd_link_hash_table *elf_s390_link_hash_table_create | |
36 | PARAMS ((bfd *)); | |
37 | static boolean elf_s390_check_relocs | |
38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
39 | const Elf_Internal_Rela *)); | |
99c79b2e AJ |
40 | static asection *elf_s390_gc_mark_hook |
41 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
42 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
43 | static boolean elf_s390_gc_sweep_hook | |
44 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
45 | const Elf_Internal_Rela *)); | |
a85d7ed0 NC |
46 | static boolean elf_s390_adjust_dynamic_symbol |
47 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
48 | static boolean elf_s390_size_dynamic_sections | |
49 | PARAMS ((bfd *, struct bfd_link_info *)); | |
50 | static boolean elf_s390_relocate_section | |
51 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
52 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
53 | static boolean elf_s390_finish_dynamic_symbol | |
54 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
55 | Elf_Internal_Sym *)); | |
56 | static boolean elf_s390_finish_dynamic_sections | |
57 | PARAMS ((bfd *, struct bfd_link_info *)); | |
99c79b2e | 58 | static boolean elf_s390_object_p PARAMS ((bfd *)); |
f51e552e AM |
59 | static enum elf_reloc_type_class elf_s390_reloc_type_class |
60 | PARAMS ((const Elf_Internal_Rela *)); | |
a85d7ed0 NC |
61 | |
62 | #define USE_RELA 1 /* We want RELA relocations, not REL. */ | |
63 | ||
64 | #include "elf/s390.h" | |
65 | ||
66 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value | |
67 | from smaller values. Start with zero, widen, *then* decrement. */ | |
68 | #define MINUS_ONE (((bfd_vma)0) - 1) | |
69 | ||
70 | /* The relocation "howto" table. */ | |
71 | static reloc_howto_type elf_howto_table[] = | |
72 | { | |
73 | HOWTO (R_390_NONE, /* type */ | |
74 | 0, /* rightshift */ | |
75 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
76 | 0, /* bitsize */ | |
77 | false, /* pc_relative */ | |
78 | 0, /* bitpos */ | |
79 | complain_overflow_dont, /* complain_on_overflow */ | |
80 | bfd_elf_generic_reloc, /* special_function */ | |
81 | "R_390_NONE", /* name */ | |
82 | false, /* partial_inplace */ | |
83 | 0, /* src_mask */ | |
84 | 0, /* dst_mask */ | |
85 | false), /* pcrel_offset */ | |
86 | ||
87 | HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false), | |
88 | HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false), | |
89 | HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false), | |
90 | HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false), | |
91 | HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true), | |
92 | HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false), | |
93 | HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false), | |
94 | HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true), | |
95 | HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false), | |
96 | HOWTO(R_390_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,MINUS_ONE, false), | |
97 | HOWTO(R_390_JMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,MINUS_ONE, false), | |
98 | HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false), | |
99 | HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false), | |
100 | HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true), | |
101 | HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false), | |
102 | HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true), | |
103 | HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true), | |
104 | HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true), | |
105 | HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true), | |
106 | HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true), | |
107 | HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true), | |
108 | HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false), | |
109 | HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true), | |
110 | HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false), | |
111 | HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true), | |
112 | HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true), | |
113 | }; | |
114 | ||
115 | /* GNU extension to record C++ vtable hierarchy. */ | |
116 | static reloc_howto_type elf64_s390_vtinherit_howto = | |
117 | HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false); | |
118 | static reloc_howto_type elf64_s390_vtentry_howto = | |
99c79b2e | 119 | HOWTO (R_390_GNU_VTENTRY, 0,4,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false); |
a85d7ed0 NC |
120 | |
121 | static reloc_howto_type * | |
122 | elf_s390_reloc_type_lookup (abfd, code) | |
123 | bfd *abfd ATTRIBUTE_UNUSED; | |
124 | bfd_reloc_code_real_type code; | |
125 | { | |
126 | switch (code) { | |
127 | case BFD_RELOC_NONE: | |
128 | return &elf_howto_table[(int) R_390_NONE]; | |
129 | case BFD_RELOC_8: | |
130 | return &elf_howto_table[(int) R_390_8]; | |
131 | case BFD_RELOC_390_12: | |
132 | return &elf_howto_table[(int) R_390_12]; | |
133 | case BFD_RELOC_16: | |
134 | return &elf_howto_table[(int) R_390_16]; | |
135 | case BFD_RELOC_32: | |
136 | return &elf_howto_table[(int) R_390_32]; | |
137 | case BFD_RELOC_CTOR: | |
138 | return &elf_howto_table[(int) R_390_32]; | |
139 | case BFD_RELOC_32_PCREL: | |
140 | return &elf_howto_table[(int) R_390_PC32]; | |
141 | case BFD_RELOC_390_GOT12: | |
142 | return &elf_howto_table[(int) R_390_GOT12]; | |
143 | case BFD_RELOC_32_GOT_PCREL: | |
144 | return &elf_howto_table[(int) R_390_GOT32]; | |
145 | case BFD_RELOC_390_PLT32: | |
146 | return &elf_howto_table[(int) R_390_PLT32]; | |
147 | case BFD_RELOC_390_COPY: | |
148 | return &elf_howto_table[(int) R_390_COPY]; | |
149 | case BFD_RELOC_390_GLOB_DAT: | |
150 | return &elf_howto_table[(int) R_390_GLOB_DAT]; | |
151 | case BFD_RELOC_390_JMP_SLOT: | |
152 | return &elf_howto_table[(int) R_390_JMP_SLOT]; | |
153 | case BFD_RELOC_390_RELATIVE: | |
154 | return &elf_howto_table[(int) R_390_RELATIVE]; | |
155 | case BFD_RELOC_32_GOTOFF: | |
156 | return &elf_howto_table[(int) R_390_GOTOFF]; | |
157 | case BFD_RELOC_390_GOTPC: | |
158 | return &elf_howto_table[(int) R_390_GOTPC]; | |
159 | case BFD_RELOC_390_GOT16: | |
160 | return &elf_howto_table[(int) R_390_GOT16]; | |
161 | case BFD_RELOC_16_PCREL: | |
162 | return &elf_howto_table[(int) R_390_PC16]; | |
163 | case BFD_RELOC_390_PC16DBL: | |
164 | return &elf_howto_table[(int) R_390_PC16DBL]; | |
165 | case BFD_RELOC_390_PLT16DBL: | |
166 | return &elf_howto_table[(int) R_390_PLT16DBL]; | |
167 | case BFD_RELOC_VTABLE_INHERIT: | |
168 | return &elf64_s390_vtinherit_howto; | |
169 | case BFD_RELOC_VTABLE_ENTRY: | |
170 | return &elf64_s390_vtentry_howto; | |
171 | case BFD_RELOC_390_PC32DBL: | |
172 | return &elf_howto_table[(int) R_390_PC32DBL]; | |
173 | case BFD_RELOC_390_PLT32DBL: | |
174 | return &elf_howto_table[(int) R_390_PLT32DBL]; | |
175 | case BFD_RELOC_390_GOTPCDBL: | |
176 | return &elf_howto_table[(int) R_390_GOTPCDBL]; | |
177 | case BFD_RELOC_64: | |
178 | return &elf_howto_table[(int) R_390_64]; | |
179 | case BFD_RELOC_64_PCREL: | |
180 | return &elf_howto_table[(int) R_390_PC64]; | |
181 | case BFD_RELOC_390_GOT64: | |
182 | return &elf_howto_table[(int) R_390_GOT64]; | |
183 | case BFD_RELOC_390_PLT64: | |
184 | return &elf_howto_table[(int) R_390_PLT64]; | |
185 | case BFD_RELOC_390_GOTENT: | |
186 | return &elf_howto_table[(int) R_390_GOTENT]; | |
187 | default: | |
99c79b2e | 188 | break; |
a85d7ed0 NC |
189 | } |
190 | return 0; | |
191 | } | |
192 | ||
193 | /* We need to use ELF64_R_TYPE so we have our own copy of this function, | |
194 | and elf64-s390.c has its own copy. */ | |
195 | ||
196 | static void | |
197 | elf_s390_info_to_howto (abfd, cache_ptr, dst) | |
198 | bfd *abfd ATTRIBUTE_UNUSED; | |
199 | arelent *cache_ptr; | |
200 | Elf_Internal_Rela *dst; | |
201 | { | |
202 | switch (ELF64_R_TYPE(dst->r_info)) | |
203 | { | |
204 | case R_390_GNU_VTINHERIT: | |
205 | cache_ptr->howto = &elf64_s390_vtinherit_howto; | |
206 | break; | |
207 | ||
208 | case R_390_GNU_VTENTRY: | |
209 | cache_ptr->howto = &elf64_s390_vtentry_howto; | |
210 | break; | |
211 | ||
212 | default: | |
213 | BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max); | |
214 | cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)]; | |
99c79b2e | 215 | } |
a85d7ed0 NC |
216 | } |
217 | ||
218 | static boolean | |
219 | elf_s390_is_local_label_name (abfd, name) | |
220 | bfd *abfd; | |
221 | const char *name; | |
222 | { | |
223 | if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) | |
224 | return true; | |
225 | ||
226 | return _bfd_elf_is_local_label_name (abfd, name); | |
227 | } | |
228 | ||
229 | /* Functions for the 390 ELF linker. */ | |
230 | ||
231 | /* The name of the dynamic interpreter. This is put in the .interp | |
232 | section. */ | |
233 | ||
234 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
235 | ||
236 | /* The nop opcode we use. */ | |
237 | ||
238 | #define s390_NOP 0x07070707 | |
239 | ||
240 | ||
241 | /* The size in bytes of the first entry in the procedure linkage table. */ | |
242 | #define PLT_FIRST_ENTRY_SIZE 32 | |
243 | /* The size in bytes of an entry in the procedure linkage table. */ | |
99c79b2e | 244 | #define PLT_ENTRY_SIZE 32 |
a85d7ed0 NC |
245 | |
246 | #define GOT_ENTRY_SIZE 8 | |
247 | ||
248 | /* The first three entries in a procedure linkage table are reserved, | |
249 | and the initial contents are unimportant (we zero them out). | |
250 | Subsequent entries look like this. See the SVR4 ABI 386 | |
251 | supplement to see how this works. */ | |
252 | ||
253 | /* For the s390, simple addr offset can only be 0 - 4096. | |
254 | To use the full 16777216 TB address space, several instructions | |
255 | are needed to load an address in a register and execute | |
256 | a branch( or just saving the address) | |
257 | ||
99c79b2e | 258 | Furthermore, only r 0 and 1 are free to use!!! */ |
a85d7ed0 NC |
259 | |
260 | /* The first 3 words in the GOT are then reserved. | |
261 | Word 0 is the address of the dynamic table. | |
262 | Word 1 is a pointer to a structure describing the object | |
263 | Word 2 is used to point to the loader entry address. | |
264 | ||
265 | The code for PLT entries looks like this: | |
266 | ||
267 | The GOT holds the address in the PLT to be executed. | |
268 | The loader then gets: | |
269 | 24(15) = Pointer to the structure describing the object. | |
99c79b2e | 270 | 28(15) = Offset in symbol table |
a85d7ed0 NC |
271 | The loader must then find the module where the function is |
272 | and insert the address in the GOT. | |
273 | ||
274 | PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 | |
275 | LG 1,0(1) # 6 bytes Load address from GOT in r1 | |
276 | BCR 15,1 # 2 bytes Jump to address | |
277 | RET1: BASR 1,0 # 2 bytes Return from GOT 1st time | |
278 | LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 | |
279 | BRCL 15,-x # 6 bytes Jump to start of PLT | |
280 | .long ? # 4 bytes offset into symbol table | |
281 | ||
282 | Total = 32 bytes per PLT entry | |
283 | Fixup at offset 2: relative address to GOT entry | |
284 | Fixup at offset 22: relative branch to PLT0 | |
285 | Fixup at offset 28: 32 bit offset into symbol table | |
286 | ||
287 | A 32 bit offset into the symbol table is enough. It allows for symbol | |
288 | tables up to a size of 2 gigabyte. A single dynamic object (the main | |
289 | program, any shared library) is limited to 4GB in size and I want to see | |
290 | the program that manages to have a symbol table of more than 2 GB with a | |
291 | total size of at max 4 GB. */ | |
292 | ||
dc810e39 AM |
293 | #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 |
294 | #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 | |
295 | #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 | |
296 | #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 | |
297 | #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c | |
298 | #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 | |
299 | #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 | |
300 | #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 | |
a85d7ed0 NC |
301 | |
302 | /* The first PLT entry pushes the offset into the symbol table | |
303 | from R1 onto the stack at 8(15) and the loader object info | |
304 | at 12(15), loads the loader address in R1 and jumps to it. */ | |
305 | ||
306 | /* The first entry in the PLT: | |
307 | ||
308 | PLT0: | |
309 | STG 1,56(15) # r1 contains the offset into the symbol table | |
310 | LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table | |
311 | MVC 48(8,15),8(1) # move loader ino (object struct address) to stack | |
312 | LG 1,16(1) # get entry address of loader | |
313 | BCR 15,1 # jump to loader | |
314 | ||
315 | Fixup at offset 8: relative address to start of GOT. */ | |
316 | ||
dc810e39 AM |
317 | #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 |
318 | #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 | |
319 | #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 | |
320 | #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 | |
321 | #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 | |
322 | #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 | |
323 | #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 | |
324 | #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 | |
a85d7ed0 NC |
325 | |
326 | /* The s390 linker needs to keep track of the number of relocs that it | |
327 | decides to copy in check_relocs for each symbol. This is so that | |
328 | it can discard PC relative relocs if it doesn't need them when | |
329 | linking with -Bsymbolic. We store the information in a field | |
330 | extending the regular ELF linker hash table. */ | |
331 | ||
332 | /* This structure keeps track of the number of PC relative relocs we | |
333 | have copied for a given symbol. */ | |
334 | ||
335 | struct elf_s390_pcrel_relocs_copied | |
336 | { | |
337 | /* Next section. */ | |
338 | struct elf_s390_pcrel_relocs_copied *next; | |
339 | /* A section in dynobj. */ | |
340 | asection *section; | |
341 | /* Number of relocs copied in this section. */ | |
342 | bfd_size_type count; | |
343 | }; | |
344 | ||
345 | /* s390 ELF linker hash entry. */ | |
346 | ||
347 | struct elf_s390_link_hash_entry | |
348 | { | |
349 | struct elf_link_hash_entry root; | |
350 | ||
351 | /* Number of PC relative relocs copied for this symbol. */ | |
352 | struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied; | |
353 | }; | |
354 | ||
355 | /* s390 ELF linker hash table. */ | |
356 | ||
357 | struct elf_s390_link_hash_table | |
358 | { | |
359 | struct elf_link_hash_table root; | |
360 | }; | |
361 | ||
362 | /* Declare this now that the above structures are defined. */ | |
363 | ||
364 | static boolean elf_s390_discard_copies | |
365 | PARAMS ((struct elf_s390_link_hash_entry *, PTR)); | |
366 | ||
367 | /* Traverse an s390 ELF linker hash table. */ | |
368 | ||
369 | #define elf_s390_link_hash_traverse(table, func, info) \ | |
370 | (elf_link_hash_traverse \ | |
371 | (&(table)->root, \ | |
372 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
373 | (info))) | |
374 | ||
375 | /* Get the s390 ELF linker hash table from a link_info structure. */ | |
376 | ||
377 | #define elf_s390_hash_table(p) \ | |
378 | ((struct elf_s390_link_hash_table *) ((p)->hash)) | |
379 | ||
380 | /* Create an entry in an s390 ELF linker hash table. */ | |
381 | ||
382 | static struct bfd_hash_entry * | |
383 | elf_s390_link_hash_newfunc (entry, table, string) | |
384 | struct bfd_hash_entry *entry; | |
385 | struct bfd_hash_table *table; | |
386 | const char *string; | |
387 | { | |
388 | struct elf_s390_link_hash_entry *ret = | |
389 | (struct elf_s390_link_hash_entry *) entry; | |
390 | ||
391 | /* Allocate the structure if it has not already been allocated by a | |
392 | subclass. */ | |
393 | if (ret == (struct elf_s390_link_hash_entry *) NULL) | |
394 | ret = ((struct elf_s390_link_hash_entry *) | |
395 | bfd_hash_allocate (table, | |
396 | sizeof (struct elf_s390_link_hash_entry))); | |
397 | if (ret == (struct elf_s390_link_hash_entry *) NULL) | |
398 | return (struct bfd_hash_entry *) ret; | |
399 | ||
400 | /* Call the allocation method of the superclass. */ | |
401 | ret = ((struct elf_s390_link_hash_entry *) | |
402 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
403 | table, string)); | |
404 | if (ret != (struct elf_s390_link_hash_entry *) NULL) | |
405 | { | |
406 | ret->pcrel_relocs_copied = NULL; | |
407 | } | |
408 | ||
409 | return (struct bfd_hash_entry *) ret; | |
410 | } | |
411 | ||
412 | /* Create an s390 ELF linker hash table. */ | |
413 | ||
414 | static struct bfd_link_hash_table * | |
415 | elf_s390_link_hash_table_create (abfd) | |
416 | bfd *abfd; | |
417 | { | |
418 | struct elf_s390_link_hash_table *ret; | |
dc810e39 | 419 | bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); |
a85d7ed0 | 420 | |
dc810e39 | 421 | ret = ((struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt)); |
a85d7ed0 NC |
422 | if (ret == (struct elf_s390_link_hash_table *) NULL) |
423 | return NULL; | |
424 | ||
425 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
426 | elf_s390_link_hash_newfunc)) | |
427 | { | |
428 | bfd_release (abfd, ret); | |
429 | return NULL; | |
430 | } | |
431 | ||
432 | return &ret->root.root; | |
433 | } | |
434 | ||
435 | ||
436 | /* Look through the relocs for a section during the first phase, and | |
437 | allocate space in the global offset table or procedure linkage | |
438 | table. */ | |
439 | ||
440 | static boolean | |
441 | elf_s390_check_relocs (abfd, info, sec, relocs) | |
442 | bfd *abfd; | |
443 | struct bfd_link_info *info; | |
444 | asection *sec; | |
445 | const Elf_Internal_Rela *relocs; | |
446 | { | |
447 | bfd *dynobj; | |
448 | Elf_Internal_Shdr *symtab_hdr; | |
449 | struct elf_link_hash_entry **sym_hashes; | |
450 | bfd_signed_vma *local_got_refcounts; | |
451 | const Elf_Internal_Rela *rel; | |
452 | const Elf_Internal_Rela *rel_end; | |
453 | asection *sgot; | |
454 | asection *srelgot; | |
455 | asection *sreloc; | |
456 | ||
457 | if (info->relocateable) | |
458 | return true; | |
459 | ||
460 | dynobj = elf_hash_table (info)->dynobj; | |
461 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
462 | sym_hashes = elf_sym_hashes (abfd); | |
463 | local_got_refcounts = elf_local_got_offsets (abfd); | |
464 | ||
465 | sgot = NULL; | |
466 | srelgot = NULL; | |
467 | sreloc = NULL; | |
468 | ||
469 | rel_end = relocs + sec->reloc_count; | |
470 | for (rel = relocs; rel < rel_end; rel++) | |
471 | { | |
472 | unsigned long r_symndx; | |
473 | struct elf_link_hash_entry *h; | |
474 | ||
475 | r_symndx = ELF64_R_SYM (rel->r_info); | |
476 | ||
477 | if (r_symndx < symtab_hdr->sh_info) | |
478 | h = NULL; | |
479 | else | |
99c79b2e | 480 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
a85d7ed0 NC |
481 | |
482 | /* Some relocs require a global offset table. */ | |
483 | if (dynobj == NULL) | |
484 | { | |
485 | switch (ELF64_R_TYPE (rel->r_info)) | |
486 | { | |
487 | case R_390_GOT12: | |
488 | case R_390_GOT16: | |
489 | case R_390_GOT32: | |
490 | case R_390_GOT64: | |
491 | case R_390_GOTOFF: | |
492 | case R_390_GOTPC: | |
493 | case R_390_GOTPCDBL: | |
494 | case R_390_GOTENT: | |
495 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
496 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
497 | return false; | |
498 | break; | |
499 | ||
500 | default: | |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
505 | ||
506 | switch (ELF64_R_TYPE (rel->r_info)) | |
507 | { | |
508 | case R_390_GOT12: | |
509 | case R_390_GOT16: | |
510 | case R_390_GOT32: | |
511 | case R_390_GOT64: | |
512 | case R_390_GOTENT: | |
513 | /* This symbol requires a global offset table entry. */ | |
514 | ||
515 | if (sgot == NULL) | |
516 | { | |
517 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
518 | BFD_ASSERT (sgot != NULL); | |
519 | } | |
520 | ||
521 | ||
522 | if (srelgot == NULL | |
523 | && (h != NULL || info->shared)) | |
524 | { | |
525 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
526 | if (srelgot == NULL) | |
527 | { | |
528 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
529 | if (srelgot == NULL | |
530 | || ! bfd_set_section_flags (dynobj, srelgot, | |
531 | (SEC_ALLOC | |
532 | | SEC_LOAD | |
533 | | SEC_HAS_CONTENTS | |
534 | | SEC_IN_MEMORY | |
535 | | SEC_LINKER_CREATED | |
536 | | SEC_READONLY)) | |
537 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
538 | return false; | |
539 | } | |
540 | } | |
541 | ||
542 | if (h != NULL) | |
543 | { | |
51b64d56 | 544 | if (h->got.refcount == 0) |
a85d7ed0 | 545 | { |
a85d7ed0 NC |
546 | /* Make sure this symbol is output as a dynamic symbol. */ |
547 | if (h->dynindx == -1) | |
548 | { | |
549 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) | |
550 | return false; | |
551 | } | |
99c79b2e | 552 | |
a85d7ed0 NC |
553 | sgot->_raw_size += 8; |
554 | srelgot->_raw_size += sizeof (Elf64_External_Rela); | |
555 | } | |
51b64d56 | 556 | h->got.refcount += 1; |
a85d7ed0 NC |
557 | } |
558 | else | |
559 | { | |
99c79b2e | 560 | /* This is a global offset table entry for a local symbol. */ |
a85d7ed0 NC |
561 | if (local_got_refcounts == NULL) |
562 | { | |
dc810e39 | 563 | bfd_size_type size; |
a85d7ed0 NC |
564 | |
565 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
dc810e39 | 566 | local_got_refcounts = ((bfd_signed_vma *) |
51b64d56 | 567 | bfd_zalloc (abfd, size)); |
a85d7ed0 NC |
568 | if (local_got_refcounts == NULL) |
569 | return false; | |
570 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
a85d7ed0 | 571 | } |
51b64d56 | 572 | if (local_got_refcounts[r_symndx] == 0) |
a85d7ed0 | 573 | { |
a85d7ed0 NC |
574 | sgot->_raw_size += 8; |
575 | if (info->shared) | |
576 | { | |
577 | /* If we are generating a shared object, we need to | |
578 | output a R_390_RELATIVE reloc so that the dynamic | |
579 | linker can adjust this GOT entry. */ | |
580 | srelgot->_raw_size += sizeof (Elf64_External_Rela); | |
581 | } | |
582 | } | |
51b64d56 | 583 | local_got_refcounts[r_symndx] += 1; |
a85d7ed0 NC |
584 | } |
585 | break; | |
586 | ||
587 | case R_390_PLT16DBL: | |
588 | case R_390_PLT32: | |
589 | case R_390_PLT32DBL: | |
590 | case R_390_PLT64: | |
591 | /* This symbol requires a procedure linkage table entry. We | |
592 | actually build the entry in adjust_dynamic_symbol, | |
593 | because this might be a case of linking PIC code which is | |
594 | never referenced by a dynamic object, in which case we | |
595 | don't need to generate a procedure linkage table entry | |
596 | after all. */ | |
597 | ||
598 | /* If this is a local symbol, we resolve it directly without | |
599 | creating a procedure linkage table entry. */ | |
600 | if (h == NULL) | |
601 | continue; | |
602 | ||
51b64d56 AM |
603 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
604 | h->plt.refcount += 1; | |
a85d7ed0 NC |
605 | break; |
606 | ||
607 | case R_390_8: | |
608 | case R_390_16: | |
609 | case R_390_32: | |
610 | case R_390_64: | |
611 | case R_390_PC16: | |
612 | case R_390_PC16DBL: | |
613 | case R_390_PC32: | |
614 | case R_390_PC32DBL: | |
615 | case R_390_PC64: | |
616 | if (h != NULL) | |
617 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
618 | ||
619 | /* If we are creating a shared library, and this is a reloc | |
620 | against a global symbol, or a non PC relative reloc | |
621 | against a local symbol, then we need to copy the reloc | |
622 | into the shared library. However, if we are linking with | |
623 | -Bsymbolic, we do not need to copy a reloc against a | |
624 | global symbol which is defined in an object we are | |
625 | including in the link (i.e., DEF_REGULAR is set). At | |
626 | this point we have not seen all the input files, so it is | |
627 | possible that DEF_REGULAR is not set now but will be set | |
628 | later (it is never cleared). We account for that | |
629 | possibility below by storing information in the | |
630 | pcrel_relocs_copied field of the hash table entry. */ | |
631 | if (info->shared | |
632 | && (sec->flags & SEC_ALLOC) != 0 | |
633 | && (ELF64_R_TYPE (rel->r_info) == R_390_8 | |
99c79b2e | 634 | || ELF64_R_TYPE (rel->r_info) == R_390_16 |
a85d7ed0 NC |
635 | || ELF64_R_TYPE (rel->r_info) == R_390_32 |
636 | || ELF64_R_TYPE (rel->r_info) == R_390_64 | |
637 | || (h != NULL | |
638 | && h->dynindx != -1 | |
639 | && (! info->symbolic | |
640 | || (h->elf_link_hash_flags | |
641 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
642 | { | |
643 | /* When creating a shared object, we must copy these | |
644 | reloc types into the output file. We create a reloc | |
645 | section in dynobj and make room for this reloc. */ | |
646 | if (sreloc == NULL) | |
647 | { | |
648 | const char *name; | |
649 | ||
650 | name = (bfd_elf_string_from_elf_section | |
651 | (abfd, | |
652 | elf_elfheader (abfd)->e_shstrndx, | |
653 | elf_section_data (sec)->rel_hdr.sh_name)); | |
654 | if (name == NULL) | |
655 | return false; | |
656 | ||
657 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
658 | && strcmp (bfd_get_section_name (abfd, sec), | |
659 | name + 5) == 0); | |
660 | ||
661 | sreloc = bfd_get_section_by_name (dynobj, name); | |
662 | if (sreloc == NULL) | |
663 | { | |
664 | flagword flags; | |
665 | ||
666 | sreloc = bfd_make_section (dynobj, name); | |
667 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
668 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
669 | if ((sec->flags & SEC_ALLOC) != 0) | |
670 | flags |= SEC_ALLOC | SEC_LOAD; | |
671 | if (sreloc == NULL | |
672 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
673 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
674 | return false; | |
675 | } | |
29c2fb7c AJ |
676 | if (sec->flags & SEC_READONLY) |
677 | info->flags |= DF_TEXTREL; | |
a85d7ed0 NC |
678 | } |
679 | ||
680 | sreloc->_raw_size += sizeof (Elf64_External_Rela); | |
681 | ||
682 | /* If we are linking with -Bsymbolic, and this is a | |
683 | global symbol, we count the number of PC relative | |
684 | relocations we have entered for this symbol, so that | |
685 | we can discard them again if the symbol is later | |
686 | defined by a regular object. Note that this function | |
687 | is only called if we are using an elf64_s390 linker | |
688 | hash table, which means that h is really a pointer to | |
689 | an elf64_s390_link_hash_entry. */ | |
690 | if (h != NULL | |
691 | && (ELF64_R_TYPE (rel->r_info) == R_390_PC16 || | |
692 | ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL || | |
693 | ELF64_R_TYPE (rel->r_info) == R_390_PC32 || | |
694 | ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL || | |
695 | ELF64_R_TYPE (rel->r_info) == R_390_PC64)) | |
696 | { | |
697 | struct elf_s390_link_hash_entry *eh; | |
698 | struct elf_s390_pcrel_relocs_copied *p; | |
699 | ||
700 | eh = (struct elf_s390_link_hash_entry *) h; | |
701 | ||
702 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
703 | if (p->section == sreloc) | |
704 | break; | |
705 | ||
706 | if (p == NULL) | |
707 | { | |
708 | p = ((struct elf_s390_pcrel_relocs_copied *) | |
dc810e39 | 709 | bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
a85d7ed0 NC |
710 | if (p == NULL) |
711 | return false; | |
712 | p->next = eh->pcrel_relocs_copied; | |
713 | eh->pcrel_relocs_copied = p; | |
714 | p->section = sreloc; | |
715 | p->count = 0; | |
716 | } | |
717 | ||
718 | ++p->count; | |
719 | } | |
720 | } | |
721 | ||
722 | break; | |
723 | ||
724 | /* This relocation describes the C++ object vtable hierarchy. | |
725 | Reconstruct it for later use during GC. */ | |
726 | case R_390_GNU_VTINHERIT: | |
727 | if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
728 | return false; | |
729 | break; | |
730 | ||
731 | /* This relocation describes which C++ vtable entries are actually | |
732 | used. Record for later use during GC. */ | |
733 | case R_390_GNU_VTENTRY: | |
734 | if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
735 | return false; | |
736 | break; | |
99c79b2e | 737 | |
a85d7ed0 NC |
738 | default: |
739 | break; | |
740 | } | |
741 | } | |
742 | ||
743 | return true; | |
744 | } | |
745 | ||
746 | /* Return the section that should be marked against GC for a given | |
747 | relocation. */ | |
748 | ||
749 | static asection * | |
750 | elf_s390_gc_mark_hook (abfd, info, rel, h, sym) | |
751 | bfd *abfd; | |
752 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
753 | Elf_Internal_Rela *rel; | |
754 | struct elf_link_hash_entry *h; | |
755 | Elf_Internal_Sym *sym; | |
756 | { | |
757 | if (h != NULL) | |
758 | { | |
759 | switch (ELF64_R_TYPE (rel->r_info)) | |
760 | { | |
761 | case R_390_GNU_VTINHERIT: | |
762 | case R_390_GNU_VTENTRY: | |
763 | break; | |
764 | ||
765 | default: | |
766 | switch (h->root.type) | |
767 | { | |
768 | case bfd_link_hash_defined: | |
769 | case bfd_link_hash_defweak: | |
770 | return h->root.u.def.section; | |
771 | ||
772 | case bfd_link_hash_common: | |
773 | return h->root.u.c.p->section; | |
774 | ||
775 | default: | |
776 | break; | |
777 | } | |
778 | } | |
779 | } | |
780 | else | |
781 | { | |
782 | if (!(elf_bad_symtab (abfd) | |
783 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
784 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
785 | && sym->st_shndx != SHN_COMMON)) | |
786 | { | |
787 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
788 | } | |
789 | } | |
790 | ||
791 | return NULL; | |
792 | } | |
793 | ||
794 | /* Update the got entry reference counts for the section being removed. */ | |
795 | ||
796 | static boolean | |
797 | elf_s390_gc_sweep_hook (abfd, info, sec, relocs) | |
798 | bfd *abfd ATTRIBUTE_UNUSED; | |
799 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
800 | asection *sec ATTRIBUTE_UNUSED; | |
801 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
802 | { | |
803 | Elf_Internal_Shdr *symtab_hdr; | |
804 | struct elf_link_hash_entry **sym_hashes; | |
805 | bfd_signed_vma *local_got_refcounts; | |
806 | const Elf_Internal_Rela *rel, *relend; | |
807 | unsigned long r_symndx; | |
808 | struct elf_link_hash_entry *h; | |
809 | bfd *dynobj; | |
810 | asection *sgot; | |
811 | asection *srelgot; | |
812 | ||
813 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
814 | sym_hashes = elf_sym_hashes (abfd); | |
815 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
816 | ||
817 | dynobj = elf_hash_table (info)->dynobj; | |
818 | if (dynobj == NULL) | |
819 | return true; | |
820 | ||
821 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
822 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
823 | ||
824 | relend = relocs + sec->reloc_count; | |
825 | for (rel = relocs; rel < relend; rel++) | |
826 | switch (ELF64_R_TYPE (rel->r_info)) | |
827 | { | |
828 | case R_390_GOT12: | |
829 | case R_390_GOT16: | |
830 | case R_390_GOT32: | |
831 | case R_390_GOT64: | |
832 | case R_390_GOTOFF: | |
833 | case R_390_GOTPC: | |
834 | case R_390_GOTPCDBL: | |
835 | case R_390_GOTENT: | |
836 | r_symndx = ELF64_R_SYM (rel->r_info); | |
837 | if (r_symndx >= symtab_hdr->sh_info) | |
838 | { | |
839 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
840 | if (h->got.refcount > 0) | |
841 | { | |
842 | h->got.refcount -= 1; | |
843 | if (h->got.refcount == 0) | |
844 | { | |
845 | sgot->_raw_size -= 8; | |
846 | srelgot->_raw_size -= sizeof (Elf64_External_Rela); | |
847 | } | |
848 | } | |
849 | } | |
850 | else if (local_got_refcounts != NULL) | |
851 | { | |
852 | if (local_got_refcounts[r_symndx] > 0) | |
853 | { | |
854 | local_got_refcounts[r_symndx] -= 1; | |
855 | if (local_got_refcounts[r_symndx] == 0) | |
856 | { | |
857 | sgot->_raw_size -= 8; | |
858 | if (info->shared) | |
859 | srelgot->_raw_size -= sizeof (Elf64_External_Rela); | |
860 | } | |
861 | } | |
862 | } | |
863 | break; | |
864 | ||
865 | case R_390_PLT16DBL: | |
866 | case R_390_PLT32: | |
867 | case R_390_PLT32DBL: | |
868 | case R_390_PLT64: | |
869 | r_symndx = ELF64_R_SYM (rel->r_info); | |
870 | if (r_symndx >= symtab_hdr->sh_info) | |
871 | { | |
872 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
873 | if (h->plt.refcount > 0) | |
874 | h->plt.refcount -= 1; | |
875 | } | |
876 | break; | |
877 | ||
878 | default: | |
879 | break; | |
880 | } | |
881 | ||
882 | return true; | |
883 | } | |
884 | ||
885 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
886 | regular object. The current definition is in some section of the | |
887 | dynamic object, but we're not including those sections. We have to | |
888 | change the definition to something the rest of the link can | |
889 | understand. */ | |
890 | ||
891 | static boolean | |
892 | elf_s390_adjust_dynamic_symbol (info, h) | |
893 | struct bfd_link_info *info; | |
894 | struct elf_link_hash_entry *h; | |
895 | { | |
896 | bfd *dynobj; | |
897 | asection *s; | |
898 | unsigned int power_of_two; | |
899 | ||
900 | dynobj = elf_hash_table (info)->dynobj; | |
901 | ||
902 | /* Make sure we know what is going on here. */ | |
903 | BFD_ASSERT (dynobj != NULL | |
904 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
905 | || h->weakdef != NULL | |
906 | || ((h->elf_link_hash_flags | |
907 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
908 | && (h->elf_link_hash_flags | |
909 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
910 | && (h->elf_link_hash_flags | |
911 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
912 | ||
913 | /* If this is a function, put it in the procedure linkage table. We | |
914 | will fill in the contents of the procedure linkage table later | |
915 | (although we could actually do it here). */ | |
916 | if (h->type == STT_FUNC | |
917 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
918 | { | |
919 | if ((! info->shared | |
920 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
921 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
922 | || (info->shared && h->plt.refcount <= 0)) | |
923 | { | |
924 | /* This case can occur if we saw a PLT32 reloc in an input | |
925 | file, but the symbol was never referred to by a dynamic | |
926 | object. In such a case, we don't actually need to build | |
927 | a procedure linkage table, and we can just do a PC32 | |
928 | reloc instead. */ | |
929 | h->plt.offset = (bfd_vma) -1; | |
930 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
931 | return true; | |
932 | } | |
933 | ||
934 | /* Make sure this symbol is output as a dynamic symbol. */ | |
935 | if (h->dynindx == -1) | |
936 | { | |
937 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) | |
938 | return false; | |
939 | } | |
940 | ||
941 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
942 | BFD_ASSERT (s != NULL); | |
943 | ||
944 | ||
945 | /* The first entry in .plt is reserved. */ | |
946 | if (s->_raw_size == 0) | |
947 | s->_raw_size = PLT_FIRST_ENTRY_SIZE; | |
948 | ||
949 | /* If this symbol is not defined in a regular file, and we are | |
950 | not generating a shared library, then set the symbol to this | |
951 | location in the .plt. This is required to make function | |
952 | pointers compare as equal between the normal executable and | |
953 | the shared library. */ | |
954 | if (! info->shared | |
955 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
956 | { | |
957 | h->root.u.def.section = s; | |
958 | h->root.u.def.value = s->_raw_size; | |
959 | } | |
960 | ||
961 | h->plt.offset = s->_raw_size; | |
962 | ||
963 | /* Make room for this entry. */ | |
964 | s->_raw_size += PLT_ENTRY_SIZE; | |
965 | ||
966 | /* We also need to make an entry in the .got.plt section, which | |
967 | will be placed in the .got section by the linker script. */ | |
968 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
969 | BFD_ASSERT (s != NULL); | |
970 | s->_raw_size += GOT_ENTRY_SIZE; | |
971 | ||
972 | /* We also need to make an entry in the .rela.plt section. */ | |
973 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
974 | BFD_ASSERT (s != NULL); | |
975 | s->_raw_size += sizeof (Elf64_External_Rela); | |
976 | ||
977 | return true; | |
978 | } | |
979 | ||
980 | /* If this is a weak symbol, and there is a real definition, the | |
981 | processor independent code will have arranged for us to see the | |
982 | real definition first, and we can just use the same value. */ | |
983 | if (h->weakdef != NULL) | |
984 | { | |
985 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
986 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
987 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
988 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
989 | return true; | |
990 | } | |
991 | ||
992 | /* This is a reference to a symbol defined by a dynamic object which | |
993 | is not a function. */ | |
994 | ||
995 | /* If we are creating a shared library, we must presume that the | |
996 | only references to the symbol are via the global offset table. | |
997 | For such cases we need not do anything here; the relocations will | |
998 | be handled correctly by relocate_section. */ | |
999 | if (info->shared) | |
1000 | return true; | |
1001 | ||
1002 | /* If there are no references to this symbol that do not use the | |
1003 | GOT, we don't need to generate a copy reloc. */ | |
1004 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
1005 | return true; | |
1006 | ||
1007 | /* We must allocate the symbol in our .dynbss section, which will | |
1008 | become part of the .bss section of the executable. There will be | |
1009 | an entry for this symbol in the .dynsym section. The dynamic | |
1010 | object will contain position independent code, so all references | |
1011 | from the dynamic object to this symbol will go through the global | |
1012 | offset table. The dynamic linker will use the .dynsym entry to | |
1013 | determine the address it must put in the global offset table, so | |
1014 | both the dynamic object and the regular object will refer to the | |
1015 | same memory location for the variable. */ | |
1016 | ||
1017 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
1018 | BFD_ASSERT (s != NULL); | |
1019 | ||
1020 | /* We must generate a R_390_COPY reloc to tell the dynamic linker | |
1021 | to copy the initial value out of the dynamic object and into the | |
1022 | runtime process image. We need to remember the offset into the | |
1023 | .rel.bss section we are going to use. */ | |
1024 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
1025 | { | |
1026 | asection *srel; | |
1027 | ||
1028 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
1029 | BFD_ASSERT (srel != NULL); | |
1030 | srel->_raw_size += sizeof (Elf64_External_Rela); | |
1031 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
1032 | } | |
1033 | ||
1034 | /* We need to figure out the alignment required for this symbol. I | |
1035 | have no idea how ELF linkers handle this. */ | |
1036 | power_of_two = bfd_log2 (h->size); | |
1037 | if (power_of_two > 3) | |
1038 | power_of_two = 3; | |
1039 | ||
1040 | /* Apply the required alignment. */ | |
1041 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
1042 | (bfd_size_type) (1 << power_of_two)); | |
1043 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
1044 | { | |
1045 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
1046 | return false; | |
1047 | } | |
1048 | ||
1049 | /* Define the symbol as being at this point in the section. */ | |
1050 | h->root.u.def.section = s; | |
1051 | h->root.u.def.value = s->_raw_size; | |
1052 | ||
1053 | /* Increment the section size to make room for the symbol. */ | |
1054 | s->_raw_size += h->size; | |
1055 | ||
1056 | return true; | |
1057 | } | |
1058 | ||
1059 | /* Set the sizes of the dynamic sections. */ | |
1060 | ||
1061 | static boolean | |
1062 | elf_s390_size_dynamic_sections (output_bfd, info) | |
29c2fb7c | 1063 | bfd *output_bfd ATTRIBUTE_UNUSED; |
a85d7ed0 NC |
1064 | struct bfd_link_info *info; |
1065 | { | |
1066 | bfd *dynobj; | |
1067 | asection *s; | |
a85d7ed0 NC |
1068 | boolean relocs; |
1069 | boolean plt; | |
1070 | ||
1071 | dynobj = elf_hash_table (info)->dynobj; | |
1072 | BFD_ASSERT (dynobj != NULL); | |
1073 | ||
1074 | if (elf_hash_table (info)->dynamic_sections_created) | |
1075 | { | |
1076 | /* Set the contents of the .interp section to the interpreter. */ | |
1077 | if (! info->shared) | |
1078 | { | |
1079 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
1080 | BFD_ASSERT (s != NULL); | |
1081 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
1082 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1083 | } | |
1084 | } | |
1085 | else | |
1086 | { | |
1087 | /* We may have created entries in the .rela.got section. | |
1088 | However, if we are not creating the dynamic sections, we will | |
1089 | not actually use these entries. Reset the size of .rela.got, | |
1090 | which will cause it to get stripped from the output file | |
1091 | below. */ | |
1092 | s = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1093 | if (s != NULL) | |
1094 | s->_raw_size = 0; | |
1095 | } | |
1096 | ||
1097 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
1098 | PC relative relocs against symbols defined in a regular object. | |
1099 | We allocated space for them in the check_relocs routine, but we | |
1100 | will not fill them in in the relocate_section routine. */ | |
1101 | if (info->shared) | |
1102 | elf_s390_link_hash_traverse (elf_s390_hash_table (info), | |
1103 | elf_s390_discard_copies, | |
1104 | (PTR) info); | |
1105 | ||
1106 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1107 | determined the sizes of the various dynamic sections. Allocate | |
1108 | memory for them. */ | |
1109 | plt = false; | |
a85d7ed0 NC |
1110 | relocs = false; |
1111 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1112 | { | |
1113 | const char *name; | |
1114 | boolean strip; | |
1115 | ||
1116 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1117 | continue; | |
1118 | ||
1119 | /* It's OK to base decisions on the section name, because none | |
1120 | of the dynobj section names depend upon the input files. */ | |
1121 | name = bfd_get_section_name (dynobj, s); | |
1122 | ||
1123 | strip = false; | |
1124 | ||
1125 | if (strcmp (name, ".plt") == 0) | |
1126 | { | |
1127 | if (s->_raw_size == 0) | |
1128 | { | |
1129 | /* Strip this section if we don't need it; see the | |
1130 | comment below. */ | |
1131 | strip = true; | |
1132 | } | |
1133 | else | |
1134 | { | |
1135 | /* Remember whether there is a PLT. */ | |
1136 | plt = true; | |
1137 | } | |
1138 | } | |
1139 | else if (strncmp (name, ".rela", 5) == 0) | |
1140 | { | |
1141 | if (s->_raw_size == 0) | |
1142 | { | |
1143 | /* If we don't need this section, strip it from the | |
1144 | output file. This is to handle .rela.bss and | |
1145 | .rel.plt. We must create it in | |
1146 | create_dynamic_sections, because it must be created | |
1147 | before the linker maps input sections to output | |
1148 | sections. The linker does that before | |
1149 | adjust_dynamic_symbol is called, and it is that | |
1150 | function which decides whether anything needs to go | |
1151 | into these sections. */ | |
1152 | strip = true; | |
1153 | } | |
1154 | else | |
1155 | { | |
a85d7ed0 NC |
1156 | /* Remember whether there are any reloc sections other |
1157 | than .rela.plt. */ | |
1158 | if (strcmp (name, ".rela.plt") != 0) | |
29c2fb7c | 1159 | relocs = true; |
a85d7ed0 NC |
1160 | |
1161 | /* We use the reloc_count field as a counter if we need | |
1162 | to copy relocs into the output file. */ | |
1163 | s->reloc_count = 0; | |
1164 | } | |
1165 | } | |
1166 | else if (strncmp (name, ".got", 4) != 0) | |
1167 | { | |
1168 | /* It's not one of our sections, so don't allocate space. */ | |
1169 | continue; | |
1170 | } | |
1171 | ||
1172 | if (strip) | |
1173 | { | |
1174 | _bfd_strip_section_from_output (info, s); | |
1175 | continue; | |
1176 | } | |
1177 | ||
1178 | /* Allocate memory for the section contents. */ | |
1179 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1180 | if (s->contents == NULL && s->_raw_size != 0) | |
1181 | return false; | |
1182 | } | |
1183 | ||
1184 | if (elf_hash_table (info)->dynamic_sections_created) | |
1185 | { | |
1186 | /* Add some entries to the .dynamic section. We fill in the | |
1187 | values later, in elf_s390_finish_dynamic_sections, but we | |
1188 | must add the entries now so that we get the correct size for | |
1189 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1190 | dynamic linker and used by the debugger. */ | |
dc810e39 AM |
1191 | #define add_dynamic_entry(TAG, VAL) \ |
1192 | bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) | |
1193 | ||
a85d7ed0 NC |
1194 | if (! info->shared) |
1195 | { | |
dc810e39 | 1196 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
a85d7ed0 NC |
1197 | return false; |
1198 | } | |
1199 | ||
1200 | if (plt) | |
1201 | { | |
dc810e39 AM |
1202 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
1203 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
1204 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) | |
1205 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
a85d7ed0 NC |
1206 | return false; |
1207 | } | |
1208 | ||
1209 | if (relocs) | |
1210 | { | |
dc810e39 AM |
1211 | if (!add_dynamic_entry (DT_RELA, 0) |
1212 | || !add_dynamic_entry (DT_RELASZ, 0) | |
1213 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) | |
a85d7ed0 NC |
1214 | return false; |
1215 | } | |
1216 | ||
29c2fb7c | 1217 | if ((info->flags & DF_TEXTREL) != 0) |
a85d7ed0 | 1218 | { |
dc810e39 | 1219 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
a85d7ed0 NC |
1220 | return false; |
1221 | info->flags |= DF_TEXTREL; | |
1222 | } | |
1223 | } | |
dc810e39 | 1224 | #undef add_dynamic_entry |
a85d7ed0 NC |
1225 | |
1226 | return true; | |
1227 | } | |
1228 | ||
1229 | /* This function is called via elf64_s390_link_hash_traverse if we are | |
1230 | creating a shared object with -Bsymbolic. It discards the space | |
1231 | allocated to copy PC relative relocs against symbols which are | |
1232 | defined in regular objects. We allocated space for them in the | |
1233 | check_relocs routine, but we won't fill them in in the | |
1234 | relocate_section routine. */ | |
1235 | ||
1236 | /*ARGSUSED*/ | |
1237 | static boolean | |
1238 | elf_s390_discard_copies (h, inf) | |
1239 | struct elf_s390_link_hash_entry *h; | |
1240 | PTR inf; | |
1241 | { | |
1242 | struct elf_s390_pcrel_relocs_copied *s; | |
1243 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
1244 | ||
1245 | /* If a symbol has been forced local or we have found a regular | |
1246 | definition for the symbolic link case, then we won't be needing | |
1247 | any relocs. */ | |
1248 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
1249 | && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 | |
1250 | || info->symbolic)) | |
1251 | { | |
1252 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
1253 | s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela); | |
1254 | } | |
1255 | ||
1256 | return true; | |
1257 | } | |
1258 | /* Relocate a 390 ELF section. */ | |
1259 | ||
1260 | static boolean | |
1261 | elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, | |
1262 | contents, relocs, local_syms, local_sections) | |
1263 | bfd *output_bfd; | |
1264 | struct bfd_link_info *info; | |
1265 | bfd *input_bfd; | |
1266 | asection *input_section; | |
1267 | bfd_byte *contents; | |
1268 | Elf_Internal_Rela *relocs; | |
1269 | Elf_Internal_Sym *local_syms; | |
1270 | asection **local_sections; | |
1271 | { | |
1272 | bfd *dynobj; | |
1273 | Elf_Internal_Shdr *symtab_hdr; | |
1274 | struct elf_link_hash_entry **sym_hashes; | |
1275 | bfd_vma *local_got_offsets; | |
1276 | asection *sgot; | |
1277 | asection *splt; | |
1278 | asection *sreloc; | |
1279 | Elf_Internal_Rela *rel; | |
1280 | Elf_Internal_Rela *relend; | |
1281 | ||
1282 | dynobj = elf_hash_table (info)->dynobj; | |
1283 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
1284 | sym_hashes = elf_sym_hashes (input_bfd); | |
1285 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1286 | ||
1287 | sgot = NULL; | |
1288 | splt = NULL; | |
1289 | sreloc = NULL; | |
1290 | if (dynobj != NULL) | |
1291 | { | |
1292 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1293 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1294 | } | |
1295 | ||
1296 | rel = relocs; | |
1297 | relend = relocs + input_section->reloc_count; | |
1298 | for (; rel < relend; rel++) | |
1299 | { | |
1300 | int r_type; | |
1301 | reloc_howto_type *howto; | |
1302 | unsigned long r_symndx; | |
1303 | struct elf_link_hash_entry *h; | |
1304 | Elf_Internal_Sym *sym; | |
1305 | asection *sec; | |
1306 | bfd_vma relocation; | |
1307 | bfd_reloc_status_type r; | |
1308 | ||
1309 | r_type = ELF64_R_TYPE (rel->r_info); | |
1310 | if (r_type == R_390_GNU_VTINHERIT | |
1311 | || r_type == R_390_GNU_VTENTRY) | |
1312 | continue; | |
1313 | if (r_type < 0 || r_type >= (int) R_390_max) | |
1314 | { | |
1315 | bfd_set_error (bfd_error_bad_value); | |
1316 | return false; | |
1317 | } | |
1318 | howto = elf_howto_table + r_type; | |
1319 | ||
1320 | r_symndx = ELF64_R_SYM (rel->r_info); | |
1321 | ||
1322 | if (info->relocateable) | |
1323 | { | |
1324 | /* This is a relocateable link. We don't have to change | |
1325 | anything, unless the reloc is against a section symbol, | |
1326 | in which case we have to adjust according to where the | |
1327 | section symbol winds up in the output section. */ | |
1328 | if (r_symndx < symtab_hdr->sh_info) | |
1329 | { | |
1330 | sym = local_syms + r_symndx; | |
1331 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1332 | { | |
1333 | sec = local_sections[r_symndx]; | |
1334 | rel->r_addend += sec->output_offset + sym->st_value; | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | continue; | |
1339 | } | |
1340 | ||
1341 | /* This is a final link. */ | |
1342 | h = NULL; | |
1343 | sym = NULL; | |
1344 | sec = NULL; | |
1345 | if (r_symndx < symtab_hdr->sh_info) | |
1346 | { | |
1347 | sym = local_syms + r_symndx; | |
1348 | sec = local_sections[r_symndx]; | |
1349 | relocation = (sec->output_section->vma | |
1350 | + sec->output_offset | |
1351 | + sym->st_value); | |
1352 | } | |
1353 | else | |
1354 | { | |
1355 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1356 | while (h->root.type == bfd_link_hash_indirect | |
1357 | || h->root.type == bfd_link_hash_warning) | |
1358 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1359 | if (h->root.type == bfd_link_hash_defined | |
1360 | || h->root.type == bfd_link_hash_defweak) | |
1361 | { | |
1362 | sec = h->root.u.def.section; | |
1363 | if ((r_type == R_390_GOTPC | |
1364 | || r_type == R_390_GOTPCDBL) | |
1365 | || ((r_type == R_390_PLT16DBL || | |
1366 | r_type == R_390_PLT32 || | |
1367 | r_type == R_390_PLT32DBL || | |
1368 | r_type == R_390_PLT64) | |
1369 | && splt != NULL | |
1370 | && h->plt.offset != (bfd_vma) -1) | |
1371 | || ((r_type == R_390_GOT12 || | |
1372 | r_type == R_390_GOT16 || | |
1373 | r_type == R_390_GOT32 || | |
1374 | r_type == R_390_GOT64 || | |
1375 | r_type == R_390_GOTENT) | |
1376 | && elf_hash_table (info)->dynamic_sections_created | |
1377 | && (! info->shared | |
1378 | || (! info->symbolic && h->dynindx != -1) | |
1379 | || (h->elf_link_hash_flags | |
1380 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1381 | || (info->shared | |
1382 | && ((! info->symbolic && h->dynindx != -1) | |
1383 | || (h->elf_link_hash_flags | |
1384 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1385 | && ( r_type == R_390_8 || | |
1386 | r_type == R_390_16 || | |
1387 | r_type == R_390_32 || | |
1388 | r_type == R_390_64 || | |
1389 | r_type == R_390_PC16 || | |
1390 | r_type == R_390_PC16DBL || | |
1391 | r_type == R_390_PC32 || | |
1392 | r_type == R_390_PC32DBL || | |
1393 | r_type == R_390_PC64) | |
1394 | && ((input_section->flags & SEC_ALLOC) != 0 | |
1395 | /* DWARF will emit R_386_32 relocations in its | |
1396 | sections against symbols defined externally | |
1397 | in shared libraries. We can't do anything | |
1398 | with them here. */ | |
1399 | || ((input_section->flags & SEC_DEBUGGING) != 0 | |
1400 | && (h->elf_link_hash_flags | |
1401 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)))) | |
1402 | { | |
1403 | /* In these cases, we don't need the relocation | |
1404 | value. We check specially because in some | |
1405 | obscure cases sec->output_section will be NULL. */ | |
1406 | relocation = 0; | |
1407 | } | |
1408 | else if (sec->output_section == NULL) | |
1409 | { | |
1410 | (*_bfd_error_handler) | |
1411 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
8f615d07 | 1412 | bfd_archive_filename (input_bfd), h->root.root.string, |
a85d7ed0 NC |
1413 | bfd_get_section_name (input_bfd, input_section)); |
1414 | relocation = 0; | |
1415 | } | |
1416 | else | |
1417 | relocation = (h->root.u.def.value | |
1418 | + sec->output_section->vma | |
1419 | + sec->output_offset); | |
1420 | } | |
1421 | else if (h->root.type == bfd_link_hash_undefweak) | |
1422 | relocation = 0; | |
671bae9c NC |
1423 | else if (info->shared |
1424 | && (!info->symbolic || info->allow_shlib_undefined) | |
a85d7ed0 NC |
1425 | && !info->no_undefined |
1426 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
1427 | relocation = 0; | |
1428 | else | |
1429 | { | |
1430 | if (! ((*info->callbacks->undefined_symbol) | |
1431 | (info, h->root.root.string, input_bfd, | |
99c79b2e AJ |
1432 | input_section, rel->r_offset, |
1433 | (!info->shared || info->no_undefined | |
a85d7ed0 NC |
1434 | || ELF_ST_VISIBILITY (h->other))))) |
1435 | return false; | |
1436 | relocation = 0; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | switch (r_type) | |
1441 | { | |
1442 | case R_390_GOT12: | |
1443 | case R_390_GOT16: | |
1444 | case R_390_GOT32: | |
1445 | case R_390_GOT64: | |
1446 | case R_390_GOTENT: | |
1447 | /* Relocation is to the entry for this symbol in the global | |
1448 | offset table. */ | |
1449 | BFD_ASSERT (sgot != NULL); | |
1450 | ||
1451 | if (h != NULL) | |
1452 | { | |
1453 | bfd_vma off; | |
1454 | ||
1455 | off = h->got.offset; | |
1456 | BFD_ASSERT (off != (bfd_vma) -1); | |
1457 | ||
1458 | if (! elf_hash_table (info)->dynamic_sections_created | |
1459 | || (info->shared | |
1460 | && (info->symbolic || h->dynindx == -1) | |
1461 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1462 | { | |
1463 | /* This is actually a static link, or it is a | |
1464 | -Bsymbolic link and the symbol is defined | |
1465 | locally, or the symbol was forced to be local | |
1466 | because of a version file. We must initialize | |
1467 | this entry in the global offset table. Since the | |
1468 | offset must always be a multiple of 2, we use the | |
1469 | least significant bit to record whether we have | |
1470 | initialized it already. | |
1471 | ||
1472 | When doing a dynamic link, we create a .rel.got | |
1473 | relocation entry to initialize the value. This | |
1474 | is done in the finish_dynamic_symbol routine. */ | |
1475 | if ((off & 1) != 0) | |
1476 | off &= ~1; | |
1477 | else | |
1478 | { | |
1479 | bfd_put_64 (output_bfd, relocation, | |
1480 | sgot->contents + off); | |
1481 | h->got.offset |= 1; | |
1482 | } | |
1483 | } | |
1484 | relocation = sgot->output_offset + off; | |
1485 | } | |
1486 | else | |
1487 | { | |
1488 | bfd_vma off; | |
1489 | ||
1490 | BFD_ASSERT (local_got_offsets != NULL | |
1491 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1492 | ||
1493 | off = local_got_offsets[r_symndx]; | |
1494 | ||
1495 | /* The offset must always be a multiple of 8. We use | |
1496 | the least significant bit to record whether we have | |
1497 | already generated the necessary reloc. */ | |
1498 | if ((off & 1) != 0) | |
1499 | off &= ~1; | |
1500 | else | |
1501 | { | |
1502 | bfd_put_64 (output_bfd, relocation, sgot->contents + off); | |
1503 | ||
1504 | if (info->shared) | |
1505 | { | |
1506 | asection *srelgot; | |
1507 | Elf_Internal_Rela outrel; | |
1508 | ||
1509 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1510 | BFD_ASSERT (srelgot != NULL); | |
1511 | ||
1512 | outrel.r_offset = (sgot->output_section->vma | |
1513 | + sgot->output_offset | |
1514 | + off); | |
1515 | outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); | |
1516 | outrel.r_addend = relocation; | |
1517 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
1518 | (((Elf64_External_Rela *) | |
1519 | srelgot->contents) | |
1520 | + srelgot->reloc_count)); | |
1521 | ++srelgot->reloc_count; | |
1522 | } | |
1523 | ||
1524 | local_got_offsets[r_symndx] |= 1; | |
1525 | } | |
1526 | ||
1527 | relocation = sgot->output_offset + off; | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * For @GOTENT the relocation is against the offset between | |
1532 | * the instruction and the symbols entry in the GOT and not | |
1533 | * between the start of the GOT and the symbols entry. We | |
1534 | * add the vma of the GOT to get the correct value. | |
1535 | */ | |
1536 | if (r_type == R_390_GOTENT) | |
1537 | relocation += sgot->output_section->vma; | |
1538 | ||
1539 | break; | |
99c79b2e | 1540 | |
a85d7ed0 NC |
1541 | case R_390_GOTOFF: |
1542 | /* Relocation is relative to the start of the global offset | |
1543 | table. */ | |
1544 | ||
1545 | if (sgot == NULL) | |
1546 | { | |
1547 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1548 | BFD_ASSERT (sgot != NULL); | |
1549 | } | |
1550 | ||
1551 | /* Note that sgot->output_offset is not involved in this | |
1552 | calculation. We always want the start of .got. If we | |
1553 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1554 | permitted by the ABI, we might have to change this | |
1555 | calculation. */ | |
1556 | relocation -= sgot->output_section->vma; | |
1557 | ||
1558 | break; | |
1559 | ||
1560 | case R_390_GOTPC: | |
1561 | case R_390_GOTPCDBL: | |
1562 | /* Use global offset table as symbol value. */ | |
1563 | ||
1564 | if (sgot == NULL) | |
1565 | { | |
1566 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1567 | BFD_ASSERT (sgot != NULL); | |
1568 | } | |
1569 | ||
1570 | relocation = sgot->output_section->vma; | |
1571 | ||
1572 | break; | |
1573 | ||
1574 | case R_390_PLT16DBL: | |
1575 | case R_390_PLT32: | |
1576 | case R_390_PLT32DBL: | |
1577 | case R_390_PLT64: | |
1578 | /* Relocation is to the entry for this symbol in the | |
1579 | procedure linkage table. */ | |
1580 | ||
1581 | /* Resolve a PLT32 reloc against a local symbol directly, | |
1582 | without using the procedure linkage table. */ | |
1583 | if (h == NULL) | |
1584 | break; | |
1585 | ||
1586 | if (h->plt.offset == (bfd_vma) -1 || splt == NULL) | |
1587 | { | |
1588 | /* We didn't make a PLT entry for this symbol. This | |
1589 | happens when statically linking PIC code, or when | |
1590 | using -Bsymbolic. */ | |
1591 | break; | |
1592 | } | |
1593 | ||
1594 | relocation = (splt->output_section->vma | |
1595 | + splt->output_offset | |
1596 | + h->plt.offset); | |
1597 | ||
1598 | break; | |
1599 | ||
1600 | case R_390_8: | |
1601 | case R_390_16: | |
1602 | case R_390_32: | |
1603 | case R_390_64: | |
1604 | case R_390_PC16: | |
1605 | case R_390_PC16DBL: | |
1606 | case R_390_PC32: | |
1607 | case R_390_PC32DBL: | |
1608 | case R_390_PC64: | |
1609 | if (info->shared | |
1610 | && (input_section->flags & SEC_ALLOC) != 0 | |
1611 | && (r_type == R_390_8 | |
1612 | || r_type == R_390_16 | |
1613 | || r_type == R_390_32 | |
1614 | || r_type == R_390_64 | |
1615 | || (h != NULL | |
1616 | && h->dynindx != -1 | |
1617 | && (! info->symbolic | |
1618 | || (h->elf_link_hash_flags | |
1619 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1620 | { | |
1621 | Elf_Internal_Rela outrel; | |
1622 | boolean skip, relocate; | |
1623 | ||
1624 | /* When generating a shared object, these relocations | |
1625 | are copied into the output file to be resolved at run | |
1626 | time. */ | |
1627 | ||
1628 | if (sreloc == NULL) | |
1629 | { | |
1630 | const char *name; | |
1631 | ||
1632 | name = (bfd_elf_string_from_elf_section | |
1633 | (input_bfd, | |
1634 | elf_elfheader (input_bfd)->e_shstrndx, | |
1635 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1636 | if (name == NULL) | |
1637 | return false; | |
1638 | ||
1639 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
1640 | && strcmp (bfd_get_section_name (input_bfd, | |
1641 | input_section), | |
1642 | name + 5) == 0); | |
1643 | ||
1644 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1645 | BFD_ASSERT (sreloc != NULL); | |
1646 | } | |
1647 | ||
1648 | skip = false; | |
1649 | ||
1650 | if (elf_section_data (input_section)->stab_info == NULL) | |
1651 | outrel.r_offset = rel->r_offset; | |
1652 | else | |
1653 | { | |
1654 | bfd_vma off; | |
1655 | ||
1656 | off = (_bfd_stab_section_offset | |
1657 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1658 | input_section, | |
1659 | &elf_section_data (input_section)->stab_info, | |
1660 | rel->r_offset)); | |
1661 | if (off == (bfd_vma) -1) | |
1662 | skip = true; | |
1663 | outrel.r_offset = off; | |
1664 | } | |
1665 | ||
1666 | outrel.r_offset += (input_section->output_section->vma | |
1667 | + input_section->output_offset); | |
1668 | ||
1669 | if (skip) | |
1670 | { | |
1671 | memset (&outrel, 0, sizeof outrel); | |
1672 | relocate = false; | |
1673 | } | |
1674 | else if (r_type == R_390_PC16 || | |
1675 | r_type == R_390_PC16DBL || | |
99c79b2e | 1676 | r_type == R_390_PC32 || |
a85d7ed0 NC |
1677 | r_type == R_390_PC32DBL || |
1678 | r_type == R_390_PC64) | |
1679 | { | |
1680 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1681 | relocate = false; | |
1682 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); | |
1683 | outrel.r_addend = relocation + rel->r_addend; | |
1684 | } | |
1685 | else | |
1686 | { | |
1687 | /* h->dynindx may be -1 if this symbol was marked to | |
1688 | become local. */ | |
1689 | if (h == NULL | |
1690 | || ((info->symbolic || h->dynindx == -1) | |
1691 | && (h->elf_link_hash_flags | |
1692 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1693 | { | |
1694 | relocate = true; | |
1695 | outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); | |
1696 | outrel.r_addend = relocation + rel->r_addend; | |
1697 | } | |
1698 | else | |
1699 | { | |
1700 | BFD_ASSERT (h->dynindx != -1); | |
1701 | relocate = false; | |
1702 | outrel.r_info = ELF64_R_INFO (h->dynindx, R_390_64); | |
1703 | outrel.r_addend = relocation + rel->r_addend; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
1708 | (((Elf64_External_Rela *) | |
1709 | sreloc->contents) | |
1710 | + sreloc->reloc_count)); | |
1711 | ++sreloc->reloc_count; | |
1712 | ||
1713 | /* If this reloc is against an external symbol, we do | |
1714 | not want to fiddle with the addend. Otherwise, we | |
1715 | need to include the symbol value so that it becomes | |
1716 | an addend for the dynamic reloc. */ | |
1717 | if (! relocate) | |
1718 | continue; | |
1719 | } | |
1720 | ||
1721 | break; | |
1722 | ||
1723 | default: | |
1724 | break; | |
1725 | } | |
1726 | ||
1727 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1728 | contents, rel->r_offset, | |
1729 | relocation, rel->r_addend); | |
1730 | ||
1731 | if (r != bfd_reloc_ok) | |
1732 | { | |
1733 | switch (r) | |
1734 | { | |
1735 | default: | |
1736 | case bfd_reloc_outofrange: | |
1737 | abort (); | |
1738 | case bfd_reloc_overflow: | |
1739 | { | |
1740 | const char *name; | |
1741 | ||
1742 | if (h != NULL) | |
1743 | name = h->root.root.string; | |
1744 | else | |
1745 | { | |
1746 | name = bfd_elf_string_from_elf_section (input_bfd, | |
1747 | symtab_hdr->sh_link, | |
1748 | sym->st_name); | |
1749 | if (name == NULL) | |
1750 | return false; | |
1751 | if (*name == '\0') | |
1752 | name = bfd_section_name (input_bfd, sec); | |
1753 | } | |
1754 | if (! ((*info->callbacks->reloc_overflow) | |
1755 | (info, name, howto->name, (bfd_vma) 0, | |
1756 | input_bfd, input_section, rel->r_offset))) | |
1757 | return false; | |
1758 | } | |
1759 | break; | |
1760 | } | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | return true; | |
1765 | } | |
1766 | ||
1767 | /* Finish up dynamic symbol handling. We set the contents of various | |
1768 | dynamic sections here. */ | |
1769 | ||
1770 | static boolean | |
1771 | elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1772 | bfd *output_bfd; | |
1773 | struct bfd_link_info *info; | |
1774 | struct elf_link_hash_entry *h; | |
1775 | Elf_Internal_Sym *sym; | |
1776 | { | |
1777 | bfd *dynobj; | |
1778 | ||
1779 | dynobj = elf_hash_table (info)->dynobj; | |
1780 | ||
1781 | if (h->plt.offset != (bfd_vma) -1) | |
1782 | { | |
1783 | asection *splt; | |
1784 | asection *srela; | |
1785 | Elf_Internal_Rela rela; | |
1786 | bfd_vma got_offset; | |
1787 | bfd_vma plt_index; | |
1788 | asection *sgot; | |
1789 | ||
1790 | /* This symbol has an entry in the procedure linkage table. Set | |
1791 | it up. */ | |
1792 | ||
1793 | BFD_ASSERT (h->dynindx != -1); | |
1794 | ||
1795 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1796 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1797 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
1798 | BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); | |
1799 | ||
99c79b2e | 1800 | /* Calc. index no. |
a85d7ed0 NC |
1801 | Current offset - size first entry / entry size. */ |
1802 | plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; | |
1803 | ||
1804 | /* Offset in GOT is PLT index plus GOT headers(3) times 8, | |
1805 | addr & GOT addr. */ | |
1806 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; | |
1807 | ||
1808 | /* Fill in the blueprint of a PLT. */ | |
1809 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD0, | |
1810 | splt->contents + h->plt.offset); | |
1811 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD1, | |
1812 | splt->contents + h->plt.offset + 4); | |
1813 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD2, | |
1814 | splt->contents + h->plt.offset + 8); | |
1815 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD3, | |
1816 | splt->contents + h->plt.offset + 12); | |
1817 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD4, | |
1818 | splt->contents + h->plt.offset + 16); | |
1819 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD5, | |
1820 | splt->contents + h->plt.offset + 20); | |
1821 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD6, | |
1822 | splt->contents + h->plt.offset + 24); | |
1823 | bfd_put_32 (output_bfd, PLT_ENTRY_WORD7, | |
1824 | splt->contents + h->plt.offset + 28); | |
1825 | /* Fixup the relative address to the GOT entry */ | |
1826 | bfd_put_32 (output_bfd, | |
1827 | (sgot->output_section->vma + sgot->output_offset + got_offset | |
1828 | - (splt->output_section->vma + h->plt.offset))/2, | |
1829 | splt->contents + h->plt.offset + 2); | |
1830 | /* Fixup the relative branch to PLT 0 */ | |
1831 | bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + | |
1832 | (PLT_ENTRY_SIZE * plt_index) + 22)/2, | |
1833 | splt->contents + h->plt.offset + 24); | |
1834 | /* Fixup offset into symbol table */ | |
1835 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), | |
1836 | splt->contents + h->plt.offset + 28); | |
1837 | ||
1838 | /* Fill in the entry in the .rela.plt section. */ | |
1839 | rela.r_offset = (sgot->output_section->vma | |
1840 | + sgot->output_offset | |
1841 | + got_offset); | |
1842 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); | |
1843 | rela.r_addend = 0; | |
1844 | bfd_elf64_swap_reloca_out (output_bfd, &rela, | |
1845 | ((Elf64_External_Rela *) srela->contents | |
1846 | + plt_index )); | |
1847 | ||
1848 | /* Fill in the entry in the global offset table. | |
1849 | Points to instruction after GOT offset. */ | |
1850 | bfd_put_64 (output_bfd, | |
1851 | (splt->output_section->vma | |
1852 | + splt->output_offset | |
1853 | + h->plt.offset | |
1854 | + 14), | |
1855 | sgot->contents + got_offset); | |
1856 | ||
1857 | ||
1858 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1859 | { | |
1860 | /* Mark the symbol as undefined, rather than as defined in | |
1861 | the .plt section. Leave the value alone. */ | |
1862 | sym->st_shndx = SHN_UNDEF; | |
1863 | } | |
1864 | } | |
1865 | ||
1866 | if (h->got.offset != (bfd_vma) -1) | |
1867 | { | |
1868 | asection *sgot; | |
1869 | asection *srela; | |
1870 | Elf_Internal_Rela rela; | |
1871 | ||
1872 | /* This symbol has an entry in the global offset table. Set it | |
1873 | up. */ | |
1874 | ||
1875 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1876 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1877 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
1878 | ||
1879 | rela.r_offset = (sgot->output_section->vma | |
1880 | + sgot->output_offset | |
dc810e39 | 1881 | + (h->got.offset &~ (bfd_vma) 1)); |
a85d7ed0 NC |
1882 | |
1883 | /* If this is a static link, or it is a -Bsymbolic link and the | |
1884 | symbol is defined locally or was forced to be local because | |
1885 | of a version file, we just want to emit a RELATIVE reloc. | |
1886 | The entry in the global offset table will already have been | |
1887 | initialized in the relocate_section function. */ | |
1888 | if (! elf_hash_table (info)->dynamic_sections_created | |
1889 | || (info->shared | |
1890 | && (info->symbolic || h->dynindx == -1) | |
1891 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1892 | { | |
1893 | rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); | |
1894 | rela.r_addend = (h->root.u.def.value | |
1895 | + h->root.u.def.section->output_section->vma | |
1896 | + h->root.u.def.section->output_offset); | |
1897 | } | |
1898 | else | |
1899 | { | |
1900 | BFD_ASSERT((h->got.offset & 1) == 0); | |
1901 | bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
1902 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); | |
1903 | rela.r_addend = 0; | |
1904 | } | |
1905 | ||
1906 | bfd_elf64_swap_reloca_out (output_bfd, &rela, | |
1907 | ((Elf64_External_Rela *) srela->contents | |
1908 | + srela->reloc_count)); | |
1909 | ++srela->reloc_count; | |
1910 | } | |
1911 | ||
1912 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1913 | { | |
1914 | asection *s; | |
1915 | Elf_Internal_Rela rela; | |
1916 | ||
1917 | /* This symbols needs a copy reloc. Set it up. */ | |
1918 | ||
1919 | BFD_ASSERT (h->dynindx != -1 | |
1920 | && (h->root.type == bfd_link_hash_defined | |
1921 | || h->root.type == bfd_link_hash_defweak)); | |
1922 | ||
1923 | ||
1924 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1925 | ".rela.bss"); | |
1926 | BFD_ASSERT (s != NULL); | |
1927 | ||
1928 | rela.r_offset = (h->root.u.def.value | |
1929 | + h->root.u.def.section->output_section->vma | |
1930 | + h->root.u.def.section->output_offset); | |
1931 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); | |
1932 | rela.r_addend = 0; | |
1933 | bfd_elf64_swap_reloca_out (output_bfd, &rela, | |
1934 | ((Elf64_External_Rela *) s->contents | |
1935 | + s->reloc_count)); | |
1936 | ++s->reloc_count; | |
1937 | } | |
1938 | ||
1939 | /* Mark some specially defined symbols as absolute. */ | |
1940 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1941 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 | |
1942 | || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) | |
1943 | sym->st_shndx = SHN_ABS; | |
1944 | ||
1945 | return true; | |
1946 | } | |
1947 | ||
1948 | /* Finish up the dynamic sections. */ | |
1949 | ||
1950 | static boolean | |
1951 | elf_s390_finish_dynamic_sections (output_bfd, info) | |
1952 | bfd *output_bfd; | |
1953 | struct bfd_link_info *info; | |
1954 | { | |
1955 | bfd *dynobj; | |
1956 | asection *sdyn; | |
1957 | asection *sgot; | |
1958 | ||
1959 | dynobj = elf_hash_table (info)->dynobj; | |
1960 | ||
1961 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1962 | BFD_ASSERT (sgot != NULL); | |
1963 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1964 | ||
1965 | if (elf_hash_table (info)->dynamic_sections_created) | |
1966 | { | |
1967 | asection *splt; | |
1968 | Elf64_External_Dyn *dyncon, *dynconend; | |
1969 | ||
1970 | BFD_ASSERT (sdyn != NULL); | |
1971 | ||
1972 | dyncon = (Elf64_External_Dyn *) sdyn->contents; | |
1973 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1974 | for (; dyncon < dynconend; dyncon++) | |
1975 | { | |
1976 | Elf_Internal_Dyn dyn; | |
1977 | const char *name; | |
1978 | asection *s; | |
1979 | ||
1980 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); | |
1981 | ||
1982 | switch (dyn.d_tag) | |
1983 | { | |
1984 | default: | |
1985 | break; | |
1986 | ||
1987 | case DT_PLTGOT: | |
1988 | name = ".got"; | |
1989 | goto get_vma; | |
1990 | case DT_JMPREL: | |
1991 | name = ".rela.plt"; | |
1992 | get_vma: | |
1993 | s = bfd_get_section_by_name(output_bfd, name); | |
1994 | BFD_ASSERT (s != NULL); | |
1995 | dyn.d_un.d_ptr = s->vma; | |
1996 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1997 | break; | |
1998 | ||
1999 | case DT_PLTRELSZ: | |
2000 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
2001 | BFD_ASSERT (s != NULL); | |
2002 | if (s->_cooked_size != 0) | |
2003 | dyn.d_un.d_val = s->_cooked_size; | |
2004 | else | |
2005 | dyn.d_un.d_val = s->_raw_size; | |
2006 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2007 | break; | |
2008 | ||
2009 | case DT_RELASZ: | |
2010 | /* The procedure linkage table relocs (DT_JMPREL) should | |
2011 | not be included in the overall relocs (DT_RELA). | |
2012 | Therefore, we override the DT_RELASZ entry here to | |
2013 | make it not include the JMPREL relocs. Since the | |
2014 | linker script arranges for .rela.plt to follow all | |
2015 | other relocation sections, we don't have to worry | |
2016 | about changing the DT_RELA entry. */ | |
2017 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
2018 | if (s != NULL) | |
2019 | { | |
2020 | if (s->_cooked_size != 0) | |
2021 | dyn.d_un.d_val -= s->_cooked_size; | |
2022 | else | |
2023 | dyn.d_un.d_val -= s->_raw_size; | |
2024 | } | |
2025 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2026 | break; | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | /* Fill in the special first entry in the procedure linkage table. */ | |
2031 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2032 | if (splt && splt->_raw_size > 0) | |
2033 | { | |
2034 | /* fill in blueprint for plt 0 entry */ | |
2035 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0, | |
2036 | splt->contents ); | |
2037 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1, | |
2038 | splt->contents +4 ); | |
2039 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3, | |
2040 | splt->contents +12 ); | |
2041 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4, | |
2042 | splt->contents +16 ); | |
2043 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5, | |
2044 | splt->contents +20 ); | |
2045 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD6, | |
2046 | splt->contents + 24); | |
2047 | bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD7, | |
2048 | splt->contents + 28 ); | |
2049 | /* Fixup relative address to start of GOT */ | |
2050 | bfd_put_32 (output_bfd, | |
2051 | (sgot->output_section->vma + sgot->output_offset | |
2052 | - splt->output_section->vma - 6)/2, | |
2053 | splt->contents + 8); | |
2054 | } | |
2055 | ||
99c79b2e | 2056 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = |
a85d7ed0 NC |
2057 | PLT_ENTRY_SIZE; |
2058 | } | |
2059 | ||
2060 | /* Set the first entry in the global offset table to the address of | |
2061 | the dynamic section. */ | |
2062 | if (sgot->_raw_size > 0) | |
2063 | { | |
2064 | if (sdyn == NULL) | |
2065 | bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents); | |
2066 | else | |
2067 | bfd_put_64 (output_bfd, | |
2068 | sdyn->output_section->vma + sdyn->output_offset, | |
2069 | sgot->contents); | |
2070 | ||
2071 | /* One entry for shared object struct ptr. */ | |
2072 | bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
2073 | /* One entry for _dl_runtime_resolve. */ | |
2074 | bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 12); | |
2075 | } | |
2076 | ||
2077 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 8; | |
2078 | ||
2079 | return true; | |
2080 | } | |
2081 | ||
2082 | static boolean | |
2083 | elf_s390_object_p (abfd) | |
2084 | bfd *abfd; | |
2085 | { | |
2086 | return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esame); | |
2087 | } | |
2088 | ||
29c2fb7c AJ |
2089 | |
2090 | static enum elf_reloc_type_class | |
f51e552e AM |
2091 | elf_s390_reloc_type_class (rela) |
2092 | const Elf_Internal_Rela *rela; | |
29c2fb7c | 2093 | { |
f51e552e | 2094 | switch ((int) ELF64_R_TYPE (rela->r_info)) |
29c2fb7c AJ |
2095 | { |
2096 | case R_390_RELATIVE: | |
2097 | return reloc_class_relative; | |
2098 | case R_390_JMP_SLOT: | |
2099 | return reloc_class_plt; | |
2100 | case R_390_COPY: | |
2101 | return reloc_class_copy; | |
2102 | default: | |
2103 | return reloc_class_normal; | |
2104 | } | |
2105 | } | |
2106 | ||
a85d7ed0 NC |
2107 | /* |
2108 | * Why was the hash table entry size definition changed from | |
2109 | * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and | |
2110 | * this is the only reason for the s390_elf64_size_info structure. | |
2111 | */ | |
2112 | ||
2113 | const struct elf_size_info s390_elf64_size_info = | |
2114 | { | |
2115 | sizeof (Elf64_External_Ehdr), | |
2116 | sizeof (Elf64_External_Phdr), | |
2117 | sizeof (Elf64_External_Shdr), | |
2118 | sizeof (Elf64_External_Rel), | |
2119 | sizeof (Elf64_External_Rela), | |
2120 | sizeof (Elf64_External_Sym), | |
2121 | sizeof (Elf64_External_Dyn), | |
2122 | sizeof (Elf_External_Note), | |
2123 | 8, /* hash-table entry size */ | |
2124 | 1, /* internal relocations per external relocations */ | |
2125 | 64, /* arch_size */ | |
2126 | 8, /* file_align */ | |
2127 | ELFCLASS64, EV_CURRENT, | |
2128 | bfd_elf64_write_out_phdrs, | |
2129 | bfd_elf64_write_shdrs_and_ehdr, | |
2130 | bfd_elf64_write_relocs, | |
2131 | bfd_elf64_swap_symbol_out, | |
2132 | bfd_elf64_slurp_reloc_table, | |
2133 | bfd_elf64_slurp_symbol_table, | |
2134 | bfd_elf64_swap_dyn_in, | |
2135 | bfd_elf64_swap_dyn_out, | |
2136 | NULL, | |
2137 | NULL, | |
2138 | NULL, | |
2139 | NULL | |
2140 | }; | |
2141 | ||
2142 | #define TARGET_BIG_SYM bfd_elf64_s390_vec | |
2143 | #define TARGET_BIG_NAME "elf64-s390" | |
2144 | #define ELF_ARCH bfd_arch_s390 | |
2145 | #define ELF_MACHINE_CODE EM_S390 | |
2146 | #define ELF_MACHINE_ALT1 EM_S390_OLD | |
2147 | #define ELF_MAXPAGESIZE 0x1000 | |
2148 | ||
2149 | #define elf_backend_size_info s390_elf64_size_info | |
2150 | ||
2151 | #define elf_backend_can_gc_sections 1 | |
51b64d56 | 2152 | #define elf_backend_can_refcount 1 |
a85d7ed0 NC |
2153 | #define elf_backend_want_got_plt 1 |
2154 | #define elf_backend_plt_readonly 1 | |
2155 | #define elf_backend_want_plt_sym 0 | |
2156 | #define elf_backend_got_header_size 24 | |
2157 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
2158 | ||
2159 | #define elf_info_to_howto elf_s390_info_to_howto | |
2160 | ||
2161 | #define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link | |
2162 | #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name | |
2163 | #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create | |
2164 | #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup | |
2165 | ||
2166 | #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol | |
2167 | #define elf_backend_check_relocs elf_s390_check_relocs | |
2168 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections | |
2169 | #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections | |
2170 | #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol | |
2171 | #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook | |
2172 | #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook | |
2173 | #define elf_backend_relocate_section elf_s390_relocate_section | |
2174 | #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections | |
29c2fb7c | 2175 | #define elf_backend_reloc_type_class elf_s390_reloc_type_class |
a85d7ed0 NC |
2176 | |
2177 | #define elf_backend_object_p elf_s390_object_p | |
2178 | ||
2179 | #include "elf64-target.h" |