| 1 | /* IBM S/390-specific support for 64-bit ELF |
| 2 | Copyright 2000, 2001, 2002 Free Software Foundation, Inc. |
| 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 |
| 33 | PARAMS ((bfd *, const char *)); |
| 34 | static struct bfd_hash_entry *link_hash_newfunc |
| 35 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 36 | static struct bfd_link_hash_table *elf_s390_link_hash_table_create |
| 37 | PARAMS ((bfd *)); |
| 38 | static boolean create_got_section |
| 39 | PARAMS((bfd *, struct bfd_link_info *)); |
| 40 | static boolean elf_s390_create_dynamic_sections |
| 41 | PARAMS((bfd *, struct bfd_link_info *)); |
| 42 | static void elf_s390_copy_indirect_symbol |
| 43 | PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); |
| 44 | static boolean elf_s390_check_relocs |
| 45 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 46 | const Elf_Internal_Rela *)); |
| 47 | static asection *elf_s390_gc_mark_hook |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 49 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 50 | static boolean elf_s390_gc_sweep_hook |
| 51 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 52 | const Elf_Internal_Rela *)); |
| 53 | static boolean elf_s390_adjust_dynamic_symbol |
| 54 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 55 | static boolean allocate_dynrelocs |
| 56 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 57 | static boolean readonly_dynrelocs |
| 58 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 59 | static boolean elf_s390_size_dynamic_sections |
| 60 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 61 | static boolean elf_s390_relocate_section |
| 62 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 63 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 64 | static boolean elf_s390_finish_dynamic_symbol |
| 65 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 66 | Elf_Internal_Sym *)); |
| 67 | static enum elf_reloc_type_class elf_s390_reloc_type_class |
| 68 | PARAMS ((const Elf_Internal_Rela *)); |
| 69 | static boolean elf_s390_finish_dynamic_sections |
| 70 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 71 | static boolean elf_s390_object_p PARAMS ((bfd *)); |
| 72 | |
| 73 | #define USE_RELA 1 /* We want RELA relocations, not REL. */ |
| 74 | |
| 75 | #include "elf/s390.h" |
| 76 | |
| 77 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value |
| 78 | from smaller values. Start with zero, widen, *then* decrement. */ |
| 79 | #define MINUS_ONE (((bfd_vma)0) - 1) |
| 80 | |
| 81 | /* The relocation "howto" table. */ |
| 82 | static reloc_howto_type elf_howto_table[] = |
| 83 | { |
| 84 | HOWTO (R_390_NONE, /* type */ |
| 85 | 0, /* rightshift */ |
| 86 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 87 | 0, /* bitsize */ |
| 88 | false, /* pc_relative */ |
| 89 | 0, /* bitpos */ |
| 90 | complain_overflow_dont, /* complain_on_overflow */ |
| 91 | bfd_elf_generic_reloc, /* special_function */ |
| 92 | "R_390_NONE", /* name */ |
| 93 | false, /* partial_inplace */ |
| 94 | 0, /* src_mask */ |
| 95 | 0, /* dst_mask */ |
| 96 | false), /* pcrel_offset */ |
| 97 | |
| 98 | HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false), |
| 99 | HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false), |
| 100 | HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false), |
| 101 | HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false), |
| 102 | HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true), |
| 103 | HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false), |
| 104 | HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false), |
| 105 | HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true), |
| 106 | HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false), |
| 107 | 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), |
| 108 | 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), |
| 109 | HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false), |
| 110 | HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false), |
| 111 | HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true), |
| 112 | HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false), |
| 113 | HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true), |
| 114 | HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true), |
| 115 | HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true), |
| 116 | HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true), |
| 117 | HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true), |
| 118 | HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true), |
| 119 | HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false), |
| 120 | HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true), |
| 121 | HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false), |
| 122 | HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true), |
| 123 | HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true), |
| 124 | }; |
| 125 | |
| 126 | /* GNU extension to record C++ vtable hierarchy. */ |
| 127 | static reloc_howto_type elf64_s390_vtinherit_howto = |
| 128 | HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false); |
| 129 | static reloc_howto_type elf64_s390_vtentry_howto = |
| 130 | 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); |
| 131 | |
| 132 | static reloc_howto_type * |
| 133 | elf_s390_reloc_type_lookup (abfd, code) |
| 134 | bfd *abfd ATTRIBUTE_UNUSED; |
| 135 | bfd_reloc_code_real_type code; |
| 136 | { |
| 137 | switch (code) |
| 138 | { |
| 139 | case BFD_RELOC_NONE: |
| 140 | return &elf_howto_table[(int) R_390_NONE]; |
| 141 | case BFD_RELOC_8: |
| 142 | return &elf_howto_table[(int) R_390_8]; |
| 143 | case BFD_RELOC_390_12: |
| 144 | return &elf_howto_table[(int) R_390_12]; |
| 145 | case BFD_RELOC_16: |
| 146 | return &elf_howto_table[(int) R_390_16]; |
| 147 | case BFD_RELOC_32: |
| 148 | return &elf_howto_table[(int) R_390_32]; |
| 149 | case BFD_RELOC_CTOR: |
| 150 | return &elf_howto_table[(int) R_390_32]; |
| 151 | case BFD_RELOC_32_PCREL: |
| 152 | return &elf_howto_table[(int) R_390_PC32]; |
| 153 | case BFD_RELOC_390_GOT12: |
| 154 | return &elf_howto_table[(int) R_390_GOT12]; |
| 155 | case BFD_RELOC_32_GOT_PCREL: |
| 156 | return &elf_howto_table[(int) R_390_GOT32]; |
| 157 | case BFD_RELOC_390_PLT32: |
| 158 | return &elf_howto_table[(int) R_390_PLT32]; |
| 159 | case BFD_RELOC_390_COPY: |
| 160 | return &elf_howto_table[(int) R_390_COPY]; |
| 161 | case BFD_RELOC_390_GLOB_DAT: |
| 162 | return &elf_howto_table[(int) R_390_GLOB_DAT]; |
| 163 | case BFD_RELOC_390_JMP_SLOT: |
| 164 | return &elf_howto_table[(int) R_390_JMP_SLOT]; |
| 165 | case BFD_RELOC_390_RELATIVE: |
| 166 | return &elf_howto_table[(int) R_390_RELATIVE]; |
| 167 | case BFD_RELOC_32_GOTOFF: |
| 168 | return &elf_howto_table[(int) R_390_GOTOFF]; |
| 169 | case BFD_RELOC_390_GOTPC: |
| 170 | return &elf_howto_table[(int) R_390_GOTPC]; |
| 171 | case BFD_RELOC_390_GOT16: |
| 172 | return &elf_howto_table[(int) R_390_GOT16]; |
| 173 | case BFD_RELOC_16_PCREL: |
| 174 | return &elf_howto_table[(int) R_390_PC16]; |
| 175 | case BFD_RELOC_390_PC16DBL: |
| 176 | return &elf_howto_table[(int) R_390_PC16DBL]; |
| 177 | case BFD_RELOC_390_PLT16DBL: |
| 178 | return &elf_howto_table[(int) R_390_PLT16DBL]; |
| 179 | case BFD_RELOC_VTABLE_INHERIT: |
| 180 | return &elf64_s390_vtinherit_howto; |
| 181 | case BFD_RELOC_VTABLE_ENTRY: |
| 182 | return &elf64_s390_vtentry_howto; |
| 183 | case BFD_RELOC_390_PC32DBL: |
| 184 | return &elf_howto_table[(int) R_390_PC32DBL]; |
| 185 | case BFD_RELOC_390_PLT32DBL: |
| 186 | return &elf_howto_table[(int) R_390_PLT32DBL]; |
| 187 | case BFD_RELOC_390_GOTPCDBL: |
| 188 | return &elf_howto_table[(int) R_390_GOTPCDBL]; |
| 189 | case BFD_RELOC_64: |
| 190 | return &elf_howto_table[(int) R_390_64]; |
| 191 | case BFD_RELOC_64_PCREL: |
| 192 | return &elf_howto_table[(int) R_390_PC64]; |
| 193 | case BFD_RELOC_390_GOT64: |
| 194 | return &elf_howto_table[(int) R_390_GOT64]; |
| 195 | case BFD_RELOC_390_PLT64: |
| 196 | return &elf_howto_table[(int) R_390_PLT64]; |
| 197 | case BFD_RELOC_390_GOTENT: |
| 198 | return &elf_howto_table[(int) R_390_GOTENT]; |
| 199 | default: |
| 200 | break; |
| 201 | } |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | /* We need to use ELF64_R_TYPE so we have our own copy of this function, |
| 206 | and elf64-s390.c has its own copy. */ |
| 207 | |
| 208 | static void |
| 209 | elf_s390_info_to_howto (abfd, cache_ptr, dst) |
| 210 | bfd *abfd ATTRIBUTE_UNUSED; |
| 211 | arelent *cache_ptr; |
| 212 | Elf_Internal_Rela *dst; |
| 213 | { |
| 214 | switch (ELF64_R_TYPE(dst->r_info)) |
| 215 | { |
| 216 | case R_390_GNU_VTINHERIT: |
| 217 | cache_ptr->howto = &elf64_s390_vtinherit_howto; |
| 218 | break; |
| 219 | |
| 220 | case R_390_GNU_VTENTRY: |
| 221 | cache_ptr->howto = &elf64_s390_vtentry_howto; |
| 222 | break; |
| 223 | |
| 224 | default: |
| 225 | BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max); |
| 226 | cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)]; |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | static boolean |
| 231 | elf_s390_is_local_label_name (abfd, name) |
| 232 | bfd *abfd; |
| 233 | const char *name; |
| 234 | { |
| 235 | if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) |
| 236 | return true; |
| 237 | |
| 238 | return _bfd_elf_is_local_label_name (abfd, name); |
| 239 | } |
| 240 | |
| 241 | /* Functions for the 390 ELF linker. */ |
| 242 | |
| 243 | /* The name of the dynamic interpreter. This is put in the .interp |
| 244 | section. */ |
| 245 | |
| 246 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" |
| 247 | |
| 248 | /* The size in bytes of the first entry in the procedure linkage table. */ |
| 249 | #define PLT_FIRST_ENTRY_SIZE 32 |
| 250 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 251 | #define PLT_ENTRY_SIZE 32 |
| 252 | |
| 253 | #define GOT_ENTRY_SIZE 8 |
| 254 | |
| 255 | /* The first three entries in a procedure linkage table are reserved, |
| 256 | and the initial contents are unimportant (we zero them out). |
| 257 | Subsequent entries look like this. See the SVR4 ABI 386 |
| 258 | supplement to see how this works. */ |
| 259 | |
| 260 | /* For the s390, simple addr offset can only be 0 - 4096. |
| 261 | To use the full 16777216 TB address space, several instructions |
| 262 | are needed to load an address in a register and execute |
| 263 | a branch( or just saving the address) |
| 264 | |
| 265 | Furthermore, only r 0 and 1 are free to use!!! */ |
| 266 | |
| 267 | /* The first 3 words in the GOT are then reserved. |
| 268 | Word 0 is the address of the dynamic table. |
| 269 | Word 1 is a pointer to a structure describing the object |
| 270 | Word 2 is used to point to the loader entry address. |
| 271 | |
| 272 | The code for PLT entries looks like this: |
| 273 | |
| 274 | The GOT holds the address in the PLT to be executed. |
| 275 | The loader then gets: |
| 276 | 24(15) = Pointer to the structure describing the object. |
| 277 | 28(15) = Offset in symbol table |
| 278 | The loader must then find the module where the function is |
| 279 | and insert the address in the GOT. |
| 280 | |
| 281 | PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 |
| 282 | LG 1,0(1) # 6 bytes Load address from GOT in r1 |
| 283 | BCR 15,1 # 2 bytes Jump to address |
| 284 | RET1: BASR 1,0 # 2 bytes Return from GOT 1st time |
| 285 | LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 |
| 286 | BRCL 15,-x # 6 bytes Jump to start of PLT |
| 287 | .long ? # 4 bytes offset into symbol table |
| 288 | |
| 289 | Total = 32 bytes per PLT entry |
| 290 | Fixup at offset 2: relative address to GOT entry |
| 291 | Fixup at offset 22: relative branch to PLT0 |
| 292 | Fixup at offset 28: 32 bit offset into symbol table |
| 293 | |
| 294 | A 32 bit offset into the symbol table is enough. It allows for symbol |
| 295 | tables up to a size of 2 gigabyte. A single dynamic object (the main |
| 296 | program, any shared library) is limited to 4GB in size and I want to see |
| 297 | the program that manages to have a symbol table of more than 2 GB with a |
| 298 | total size of at max 4 GB. */ |
| 299 | |
| 300 | #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 |
| 301 | #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 |
| 302 | #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 |
| 303 | #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 |
| 304 | #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c |
| 305 | #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 |
| 306 | #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 |
| 307 | #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 |
| 308 | |
| 309 | /* The first PLT entry pushes the offset into the symbol table |
| 310 | from R1 onto the stack at 8(15) and the loader object info |
| 311 | at 12(15), loads the loader address in R1 and jumps to it. */ |
| 312 | |
| 313 | /* The first entry in the PLT: |
| 314 | |
| 315 | PLT0: |
| 316 | STG 1,56(15) # r1 contains the offset into the symbol table |
| 317 | LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table |
| 318 | MVC 48(8,15),8(1) # move loader ino (object struct address) to stack |
| 319 | LG 1,16(1) # get entry address of loader |
| 320 | BCR 15,1 # jump to loader |
| 321 | |
| 322 | Fixup at offset 8: relative address to start of GOT. */ |
| 323 | |
| 324 | #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 |
| 325 | #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 |
| 326 | #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 |
| 327 | #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 |
| 328 | #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 |
| 329 | #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 |
| 330 | #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 |
| 331 | #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 |
| 332 | |
| 333 | /* The s390 linker needs to keep track of the number of relocs that it |
| 334 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 335 | This is so that it can later discard them if they are found to be |
| 336 | unnecessary. We store the information in a field extending the |
| 337 | regular ELF linker hash table. */ |
| 338 | |
| 339 | struct elf_s390_dyn_relocs |
| 340 | { |
| 341 | struct elf_s390_dyn_relocs *next; |
| 342 | |
| 343 | /* The input section of the reloc. */ |
| 344 | asection *sec; |
| 345 | |
| 346 | /* Total number of relocs copied for the input section. */ |
| 347 | bfd_size_type count; |
| 348 | |
| 349 | /* Number of pc-relative relocs copied for the input section. */ |
| 350 | bfd_size_type pc_count; |
| 351 | }; |
| 352 | |
| 353 | /* s390 ELF linker hash entry. */ |
| 354 | |
| 355 | struct elf_s390_link_hash_entry |
| 356 | { |
| 357 | struct elf_link_hash_entry elf; |
| 358 | |
| 359 | /* Track dynamic relocs copied for this symbol. */ |
| 360 | struct elf_s390_dyn_relocs *dyn_relocs; |
| 361 | }; |
| 362 | |
| 363 | /* s390 ELF linker hash table. */ |
| 364 | |
| 365 | struct elf_s390_link_hash_table |
| 366 | { |
| 367 | struct elf_link_hash_table elf; |
| 368 | |
| 369 | /* Short-cuts to get to dynamic linker sections. */ |
| 370 | asection *sgot; |
| 371 | asection *sgotplt; |
| 372 | asection *srelgot; |
| 373 | asection *splt; |
| 374 | asection *srelplt; |
| 375 | asection *sdynbss; |
| 376 | asection *srelbss; |
| 377 | |
| 378 | /* Small local sym to section mapping cache. */ |
| 379 | struct sym_sec_cache sym_sec; |
| 380 | }; |
| 381 | |
| 382 | /* Get the s390 ELF linker hash table from a link_info structure. */ |
| 383 | |
| 384 | #define elf_s390_hash_table(p) \ |
| 385 | ((struct elf_s390_link_hash_table *) ((p)->hash)) |
| 386 | |
| 387 | /* Create an entry in an s390 ELF linker hash table. */ |
| 388 | |
| 389 | static struct bfd_hash_entry * |
| 390 | link_hash_newfunc (entry, table, string) |
| 391 | struct bfd_hash_entry *entry; |
| 392 | struct bfd_hash_table *table; |
| 393 | const char *string; |
| 394 | { |
| 395 | /* Allocate the structure if it has not already been allocated by a |
| 396 | subclass. */ |
| 397 | if (entry == NULL) |
| 398 | { |
| 399 | entry = bfd_hash_allocate (table, |
| 400 | sizeof (struct elf_s390_link_hash_entry)); |
| 401 | if (entry == NULL) |
| 402 | return entry; |
| 403 | } |
| 404 | |
| 405 | /* Call the allocation method of the superclass. */ |
| 406 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 407 | if (entry != NULL) |
| 408 | { |
| 409 | struct elf_s390_link_hash_entry *eh; |
| 410 | |
| 411 | eh = (struct elf_s390_link_hash_entry *) entry; |
| 412 | eh->dyn_relocs = NULL; |
| 413 | } |
| 414 | |
| 415 | return entry; |
| 416 | } |
| 417 | |
| 418 | /* Create an s390 ELF linker hash table. */ |
| 419 | |
| 420 | static struct bfd_link_hash_table * |
| 421 | elf_s390_link_hash_table_create (abfd) |
| 422 | bfd *abfd; |
| 423 | { |
| 424 | struct elf_s390_link_hash_table *ret; |
| 425 | bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); |
| 426 | |
| 427 | ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); |
| 428 | if (ret == NULL) |
| 429 | return NULL; |
| 430 | |
| 431 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
| 432 | { |
| 433 | free (ret); |
| 434 | return NULL; |
| 435 | } |
| 436 | |
| 437 | ret->sgot = NULL; |
| 438 | ret->sgotplt = NULL; |
| 439 | ret->srelgot = NULL; |
| 440 | ret->splt = NULL; |
| 441 | ret->srelplt = NULL; |
| 442 | ret->sdynbss = NULL; |
| 443 | ret->srelbss = NULL; |
| 444 | ret->sym_sec.abfd = NULL; |
| 445 | |
| 446 | return &ret->elf.root; |
| 447 | } |
| 448 | |
| 449 | /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up |
| 450 | shortcuts to them in our hash table. */ |
| 451 | |
| 452 | static boolean |
| 453 | create_got_section (dynobj, info) |
| 454 | bfd *dynobj; |
| 455 | struct bfd_link_info *info; |
| 456 | { |
| 457 | struct elf_s390_link_hash_table *htab; |
| 458 | |
| 459 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 460 | return false; |
| 461 | |
| 462 | htab = elf_s390_hash_table (info); |
| 463 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 464 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 465 | if (!htab->sgot || !htab->sgotplt) |
| 466 | abort (); |
| 467 | |
| 468 | htab->srelgot = bfd_make_section (dynobj, ".rela.got"); |
| 469 | if (htab->srelgot == NULL |
| 470 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 471 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 472 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 473 | | SEC_READONLY)) |
| 474 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 475 | return false; |
| 476 | return true; |
| 477 | } |
| 478 | |
| 479 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 480 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 481 | hash table. */ |
| 482 | |
| 483 | static boolean |
| 484 | elf_s390_create_dynamic_sections (dynobj, info) |
| 485 | bfd *dynobj; |
| 486 | struct bfd_link_info *info; |
| 487 | { |
| 488 | struct elf_s390_link_hash_table *htab; |
| 489 | |
| 490 | htab = elf_s390_hash_table (info); |
| 491 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 492 | return false; |
| 493 | |
| 494 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 495 | return false; |
| 496 | |
| 497 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 498 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 499 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 500 | if (!info->shared) |
| 501 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 502 | |
| 503 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 504 | || (!info->shared && !htab->srelbss)) |
| 505 | abort (); |
| 506 | |
| 507 | return true; |
| 508 | } |
| 509 | |
| 510 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 511 | |
| 512 | static void |
| 513 | elf_s390_copy_indirect_symbol (dir, ind) |
| 514 | struct elf_link_hash_entry *dir, *ind; |
| 515 | { |
| 516 | struct elf_s390_link_hash_entry *edir, *eind; |
| 517 | |
| 518 | edir = (struct elf_s390_link_hash_entry *) dir; |
| 519 | eind = (struct elf_s390_link_hash_entry *) ind; |
| 520 | |
| 521 | if (eind->dyn_relocs != NULL) |
| 522 | { |
| 523 | if (edir->dyn_relocs != NULL) |
| 524 | { |
| 525 | struct elf_s390_dyn_relocs **pp; |
| 526 | struct elf_s390_dyn_relocs *p; |
| 527 | |
| 528 | if (ind->root.type == bfd_link_hash_indirect) |
| 529 | abort (); |
| 530 | |
| 531 | /* Add reloc counts against the weak sym to the strong sym |
| 532 | list. Merge any entries against the same section. */ |
| 533 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 534 | { |
| 535 | struct elf_s390_dyn_relocs *q; |
| 536 | |
| 537 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 538 | if (q->sec == p->sec) |
| 539 | { |
| 540 | q->pc_count += p->pc_count; |
| 541 | q->count += p->count; |
| 542 | *pp = p->next; |
| 543 | break; |
| 544 | } |
| 545 | if (q == NULL) |
| 546 | pp = &p->next; |
| 547 | } |
| 548 | *pp = edir->dyn_relocs; |
| 549 | } |
| 550 | |
| 551 | edir->dyn_relocs = eind->dyn_relocs; |
| 552 | eind->dyn_relocs = NULL; |
| 553 | } |
| 554 | |
| 555 | _bfd_elf_link_hash_copy_indirect (dir, ind); |
| 556 | } |
| 557 | |
| 558 | /* Look through the relocs for a section during the first phase, and |
| 559 | allocate space in the global offset table or procedure linkage |
| 560 | table. */ |
| 561 | |
| 562 | static boolean |
| 563 | elf_s390_check_relocs (abfd, info, sec, relocs) |
| 564 | bfd *abfd; |
| 565 | struct bfd_link_info *info; |
| 566 | asection *sec; |
| 567 | const Elf_Internal_Rela *relocs; |
| 568 | { |
| 569 | struct elf_s390_link_hash_table *htab; |
| 570 | Elf_Internal_Shdr *symtab_hdr; |
| 571 | struct elf_link_hash_entry **sym_hashes; |
| 572 | const Elf_Internal_Rela *rel; |
| 573 | const Elf_Internal_Rela *rel_end; |
| 574 | asection *sreloc; |
| 575 | |
| 576 | if (info->relocateable) |
| 577 | return true; |
| 578 | |
| 579 | htab = elf_s390_hash_table (info); |
| 580 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 581 | sym_hashes = elf_sym_hashes (abfd); |
| 582 | |
| 583 | sreloc = NULL; |
| 584 | |
| 585 | rel_end = relocs + sec->reloc_count; |
| 586 | for (rel = relocs; rel < rel_end; rel++) |
| 587 | { |
| 588 | unsigned long r_symndx; |
| 589 | struct elf_link_hash_entry *h; |
| 590 | |
| 591 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 592 | |
| 593 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 594 | { |
| 595 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 596 | bfd_archive_filename (abfd), |
| 597 | r_symndx); |
| 598 | return false; |
| 599 | } |
| 600 | |
| 601 | if (r_symndx < symtab_hdr->sh_info) |
| 602 | h = NULL; |
| 603 | else |
| 604 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 605 | |
| 606 | switch (ELF64_R_TYPE (rel->r_info)) |
| 607 | { |
| 608 | case R_390_GOT12: |
| 609 | case R_390_GOT16: |
| 610 | case R_390_GOT32: |
| 611 | case R_390_GOT64: |
| 612 | case R_390_GOTENT: |
| 613 | /* This symbol requires a global offset table entry. */ |
| 614 | if (h != NULL) |
| 615 | { |
| 616 | h->got.refcount += 1; |
| 617 | } |
| 618 | else |
| 619 | { |
| 620 | bfd_signed_vma *local_got_refcounts; |
| 621 | |
| 622 | /* This is a global offset table entry for a local symbol. */ |
| 623 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 624 | if (local_got_refcounts == NULL) |
| 625 | { |
| 626 | bfd_size_type size; |
| 627 | |
| 628 | size = symtab_hdr->sh_info; |
| 629 | size *= sizeof (bfd_signed_vma); |
| 630 | local_got_refcounts = ((bfd_signed_vma *) |
| 631 | bfd_zalloc (abfd, size)); |
| 632 | if (local_got_refcounts == NULL) |
| 633 | return false; |
| 634 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 635 | } |
| 636 | local_got_refcounts[r_symndx] += 1; |
| 637 | } |
| 638 | /* Fall through */ |
| 639 | |
| 640 | case R_390_GOTOFF: |
| 641 | case R_390_GOTPC: |
| 642 | case R_390_GOTPCDBL: |
| 643 | if (htab->sgot == NULL) |
| 644 | { |
| 645 | if (htab->elf.dynobj == NULL) |
| 646 | htab->elf.dynobj = abfd; |
| 647 | if (!create_got_section (htab->elf.dynobj, info)) |
| 648 | return false; |
| 649 | } |
| 650 | break; |
| 651 | |
| 652 | case R_390_PLT16DBL: |
| 653 | case R_390_PLT32: |
| 654 | case R_390_PLT32DBL: |
| 655 | case R_390_PLT64: |
| 656 | /* This symbol requires a procedure linkage table entry. We |
| 657 | actually build the entry in adjust_dynamic_symbol, |
| 658 | because this might be a case of linking PIC code which is |
| 659 | never referenced by a dynamic object, in which case we |
| 660 | don't need to generate a procedure linkage table entry |
| 661 | after all. */ |
| 662 | |
| 663 | /* If this is a local symbol, we resolve it directly without |
| 664 | creating a procedure linkage table entry. */ |
| 665 | if (h == NULL) |
| 666 | continue; |
| 667 | |
| 668 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 669 | h->plt.refcount += 1; |
| 670 | break; |
| 671 | |
| 672 | case R_390_8: |
| 673 | case R_390_16: |
| 674 | case R_390_32: |
| 675 | case R_390_64: |
| 676 | case R_390_PC16: |
| 677 | case R_390_PC16DBL: |
| 678 | case R_390_PC32: |
| 679 | case R_390_PC32DBL: |
| 680 | case R_390_PC64: |
| 681 | if (h != NULL && !info->shared) |
| 682 | { |
| 683 | /* If this reloc is in a read-only section, we might |
| 684 | need a copy reloc. We can't check reliably at this |
| 685 | stage whether the section is read-only, as input |
| 686 | sections have not yet been mapped to output sections. |
| 687 | Tentatively set the flag for now, and correct in |
| 688 | adjust_dynamic_symbol. */ |
| 689 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 690 | |
| 691 | /* We may need a .plt entry if the function this reloc |
| 692 | refers to is in a shared lib. */ |
| 693 | h->plt.refcount += 1; |
| 694 | } |
| 695 | |
| 696 | /* If we are creating a shared library, and this is a reloc |
| 697 | against a global symbol, or a non PC relative reloc |
| 698 | against a local symbol, then we need to copy the reloc |
| 699 | into the shared library. However, if we are linking with |
| 700 | -Bsymbolic, we do not need to copy a reloc against a |
| 701 | global symbol which is defined in an object we are |
| 702 | including in the link (i.e., DEF_REGULAR is set). At |
| 703 | this point we have not seen all the input files, so it is |
| 704 | possible that DEF_REGULAR is not set now but will be set |
| 705 | later (it is never cleared). In case of a weak definition, |
| 706 | DEF_REGULAR may be cleared later by a strong definition in |
| 707 | a shared library. We account for that possibility below by |
| 708 | storing information in the relocs_copied field of the hash |
| 709 | table entry. A similar situation occurs when creating |
| 710 | shared libraries and symbol visibility changes render the |
| 711 | symbol local. |
| 712 | |
| 713 | If on the other hand, we are creating an executable, we |
| 714 | may need to keep relocations for symbols satisfied by a |
| 715 | dynamic library if we manage to avoid copy relocs for the |
| 716 | symbol. */ |
| 717 | if ((info->shared |
| 718 | && (sec->flags & SEC_ALLOC) != 0 |
| 719 | && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 |
| 720 | && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL |
| 721 | && ELF64_R_TYPE (rel->r_info) != R_390_PC32 |
| 722 | && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL |
| 723 | && ELF64_R_TYPE (rel->r_info) != R_390_PC64) |
| 724 | || (h != NULL |
| 725 | && (! info->symbolic |
| 726 | || h->root.type == bfd_link_hash_defweak |
| 727 | || (h->elf_link_hash_flags |
| 728 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 729 | || (!info->shared |
| 730 | && (sec->flags & SEC_ALLOC) != 0 |
| 731 | && h != NULL |
| 732 | && (h->root.type == bfd_link_hash_defweak |
| 733 | || (h->elf_link_hash_flags |
| 734 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 735 | { |
| 736 | struct elf_s390_dyn_relocs *p; |
| 737 | struct elf_s390_dyn_relocs **head; |
| 738 | |
| 739 | /* We must copy these reloc types into the output file. |
| 740 | Create a reloc section in dynobj and make room for |
| 741 | this reloc. */ |
| 742 | if (sreloc == NULL) |
| 743 | { |
| 744 | const char *name; |
| 745 | bfd *dynobj; |
| 746 | |
| 747 | name = (bfd_elf_string_from_elf_section |
| 748 | (abfd, |
| 749 | elf_elfheader (abfd)->e_shstrndx, |
| 750 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 751 | if (name == NULL) |
| 752 | return false; |
| 753 | |
| 754 | if (strncmp (name, ".rela", 5) != 0 |
| 755 | || strcmp (bfd_get_section_name (abfd, sec), |
| 756 | name + 5) != 0) |
| 757 | { |
| 758 | (*_bfd_error_handler) |
| 759 | (_("%s: bad relocation section name `%s\'"), |
| 760 | bfd_archive_filename (abfd), name); |
| 761 | } |
| 762 | |
| 763 | if (htab->elf.dynobj == NULL) |
| 764 | htab->elf.dynobj = abfd; |
| 765 | |
| 766 | dynobj = htab->elf.dynobj; |
| 767 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 768 | if (sreloc == NULL) |
| 769 | { |
| 770 | flagword flags; |
| 771 | |
| 772 | sreloc = bfd_make_section (dynobj, name); |
| 773 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 774 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 775 | if ((sec->flags & SEC_ALLOC) != 0) |
| 776 | flags |= SEC_ALLOC | SEC_LOAD; |
| 777 | if (sreloc == NULL |
| 778 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 779 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 780 | return false; |
| 781 | } |
| 782 | elf_section_data (sec)->sreloc = sreloc; |
| 783 | } |
| 784 | |
| 785 | /* If this is a global symbol, we count the number of |
| 786 | relocations we need for this symbol. */ |
| 787 | if (h != NULL) |
| 788 | { |
| 789 | head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; |
| 790 | } |
| 791 | else |
| 792 | { |
| 793 | /* Track dynamic relocs needed for local syms too. |
| 794 | We really need local syms available to do this |
| 795 | easily. Oh well. */ |
| 796 | |
| 797 | asection *s; |
| 798 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 799 | sec, r_symndx); |
| 800 | if (s == NULL) |
| 801 | return false; |
| 802 | |
| 803 | head = ((struct elf_s390_dyn_relocs **) |
| 804 | &elf_section_data (s)->local_dynrel); |
| 805 | } |
| 806 | |
| 807 | p = *head; |
| 808 | if (p == NULL || p->sec != sec) |
| 809 | { |
| 810 | bfd_size_type amt = sizeof *p; |
| 811 | p = ((struct elf_s390_dyn_relocs *) |
| 812 | bfd_alloc (htab->elf.dynobj, amt)); |
| 813 | if (p == NULL) |
| 814 | return false; |
| 815 | p->next = *head; |
| 816 | *head = p; |
| 817 | p->sec = sec; |
| 818 | p->count = 0; |
| 819 | p->pc_count = 0; |
| 820 | } |
| 821 | |
| 822 | p->count += 1; |
| 823 | if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 |
| 824 | || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL |
| 825 | || ELF64_R_TYPE (rel->r_info) == R_390_PC32 |
| 826 | || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL |
| 827 | || ELF64_R_TYPE (rel->r_info) == R_390_PC64) |
| 828 | p->pc_count += 1; |
| 829 | } |
| 830 | break; |
| 831 | |
| 832 | /* This relocation describes the C++ object vtable hierarchy. |
| 833 | Reconstruct it for later use during GC. */ |
| 834 | case R_390_GNU_VTINHERIT: |
| 835 | if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 836 | return false; |
| 837 | break; |
| 838 | |
| 839 | /* This relocation describes which C++ vtable entries are actually |
| 840 | used. Record for later use during GC. */ |
| 841 | case R_390_GNU_VTENTRY: |
| 842 | if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 843 | return false; |
| 844 | break; |
| 845 | |
| 846 | default: |
| 847 | break; |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | return true; |
| 852 | } |
| 853 | |
| 854 | /* Return the section that should be marked against GC for a given |
| 855 | relocation. */ |
| 856 | |
| 857 | static asection * |
| 858 | elf_s390_gc_mark_hook (abfd, info, rel, h, sym) |
| 859 | bfd *abfd; |
| 860 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 861 | Elf_Internal_Rela *rel; |
| 862 | struct elf_link_hash_entry *h; |
| 863 | Elf_Internal_Sym *sym; |
| 864 | { |
| 865 | if (h != NULL) |
| 866 | { |
| 867 | switch (ELF64_R_TYPE (rel->r_info)) |
| 868 | { |
| 869 | case R_390_GNU_VTINHERIT: |
| 870 | case R_390_GNU_VTENTRY: |
| 871 | break; |
| 872 | |
| 873 | default: |
| 874 | switch (h->root.type) |
| 875 | { |
| 876 | case bfd_link_hash_defined: |
| 877 | case bfd_link_hash_defweak: |
| 878 | return h->root.u.def.section; |
| 879 | |
| 880 | case bfd_link_hash_common: |
| 881 | return h->root.u.c.p->section; |
| 882 | |
| 883 | default: |
| 884 | break; |
| 885 | } |
| 886 | } |
| 887 | } |
| 888 | else |
| 889 | { |
| 890 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 891 | } |
| 892 | |
| 893 | return NULL; |
| 894 | } |
| 895 | |
| 896 | /* Update the got entry reference counts for the section being removed. */ |
| 897 | |
| 898 | static boolean |
| 899 | elf_s390_gc_sweep_hook (abfd, info, sec, relocs) |
| 900 | bfd *abfd; |
| 901 | struct bfd_link_info *info; |
| 902 | asection *sec; |
| 903 | const Elf_Internal_Rela *relocs; |
| 904 | { |
| 905 | Elf_Internal_Shdr *symtab_hdr; |
| 906 | struct elf_link_hash_entry **sym_hashes; |
| 907 | bfd_signed_vma *local_got_refcounts; |
| 908 | const Elf_Internal_Rela *rel, *relend; |
| 909 | unsigned long r_symndx; |
| 910 | struct elf_link_hash_entry *h; |
| 911 | |
| 912 | elf_section_data (sec)->local_dynrel = NULL; |
| 913 | |
| 914 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 915 | sym_hashes = elf_sym_hashes (abfd); |
| 916 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 917 | |
| 918 | relend = relocs + sec->reloc_count; |
| 919 | for (rel = relocs; rel < relend; rel++) |
| 920 | switch (ELF64_R_TYPE (rel->r_info)) |
| 921 | { |
| 922 | case R_390_GOT12: |
| 923 | case R_390_GOT16: |
| 924 | case R_390_GOT32: |
| 925 | case R_390_GOT64: |
| 926 | case R_390_GOTOFF: |
| 927 | case R_390_GOTPC: |
| 928 | case R_390_GOTPCDBL: |
| 929 | case R_390_GOTENT: |
| 930 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 931 | if (r_symndx >= symtab_hdr->sh_info) |
| 932 | { |
| 933 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 934 | if (h->got.refcount > 0) |
| 935 | h->got.refcount -= 1; |
| 936 | } |
| 937 | else if (local_got_refcounts != NULL) |
| 938 | { |
| 939 | if (local_got_refcounts[r_symndx] > 0) |
| 940 | local_got_refcounts[r_symndx] -= 1; |
| 941 | } |
| 942 | break; |
| 943 | |
| 944 | case R_390_8: |
| 945 | case R_390_12: |
| 946 | case R_390_16: |
| 947 | case R_390_32: |
| 948 | case R_390_64: |
| 949 | case R_390_PC16: |
| 950 | case R_390_PC16DBL: |
| 951 | case R_390_PC32: |
| 952 | case R_390_PC32DBL: |
| 953 | case R_390_PC64: |
| 954 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 955 | if (r_symndx >= symtab_hdr->sh_info) |
| 956 | { |
| 957 | struct elf_s390_link_hash_entry *eh; |
| 958 | struct elf_s390_dyn_relocs **pp; |
| 959 | struct elf_s390_dyn_relocs *p; |
| 960 | |
| 961 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 962 | |
| 963 | if (!info->shared && h->plt.refcount > 0) |
| 964 | h->plt.refcount -= 1; |
| 965 | |
| 966 | eh = (struct elf_s390_link_hash_entry *) h; |
| 967 | |
| 968 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 969 | if (p->sec == sec) |
| 970 | { |
| 971 | if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 |
| 972 | || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL |
| 973 | || ELF64_R_TYPE (rel->r_info) == R_390_PC32) |
| 974 | p->pc_count -= 1; |
| 975 | p->count -= 1; |
| 976 | if (p->count == 0) |
| 977 | *pp = p->next; |
| 978 | break; |
| 979 | } |
| 980 | } |
| 981 | break; |
| 982 | |
| 983 | case R_390_PLT16DBL: |
| 984 | case R_390_PLT32: |
| 985 | case R_390_PLT32DBL: |
| 986 | case R_390_PLT64: |
| 987 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 988 | if (r_symndx >= symtab_hdr->sh_info) |
| 989 | { |
| 990 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 991 | if (h->plt.refcount > 0) |
| 992 | h->plt.refcount -= 1; |
| 993 | } |
| 994 | break; |
| 995 | |
| 996 | default: |
| 997 | break; |
| 998 | } |
| 999 | |
| 1000 | return true; |
| 1001 | } |
| 1002 | |
| 1003 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1004 | regular object. The current definition is in some section of the |
| 1005 | dynamic object, but we're not including those sections. We have to |
| 1006 | change the definition to something the rest of the link can |
| 1007 | understand. */ |
| 1008 | |
| 1009 | static boolean |
| 1010 | elf_s390_adjust_dynamic_symbol (info, h) |
| 1011 | struct bfd_link_info *info; |
| 1012 | struct elf_link_hash_entry *h; |
| 1013 | { |
| 1014 | struct elf_s390_link_hash_table *htab; |
| 1015 | struct elf_s390_link_hash_entry * eh; |
| 1016 | struct elf_s390_dyn_relocs *p; |
| 1017 | asection *s; |
| 1018 | unsigned int power_of_two; |
| 1019 | |
| 1020 | /* If this is a function, put it in the procedure linkage table. We |
| 1021 | will fill in the contents of the procedure linkage table later |
| 1022 | (although we could actually do it here). */ |
| 1023 | if (h->type == STT_FUNC |
| 1024 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 1025 | { |
| 1026 | if (h->plt.refcount <= 0 |
| 1027 | || (! info->shared |
| 1028 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 1029 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 |
| 1030 | && h->root.type != bfd_link_hash_undefweak |
| 1031 | && h->root.type != bfd_link_hash_undefined)) |
| 1032 | { |
| 1033 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1034 | file, but the symbol was never referred to by a dynamic |
| 1035 | object, or if all references were garbage collected. In |
| 1036 | such a case, we don't actually need to build a procedure |
| 1037 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1038 | h->plt.offset = (bfd_vma) -1; |
| 1039 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1040 | } |
| 1041 | |
| 1042 | return true; |
| 1043 | } |
| 1044 | else |
| 1045 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1046 | needed for an R_390_PC32 reloc to a non-function sym in |
| 1047 | check_relocs. We can't decide accurately between function and |
| 1048 | non-function syms in check-relocs; Objects loaded later in |
| 1049 | the link may change h->type. So fix it now. */ |
| 1050 | h->plt.offset = (bfd_vma) -1; |
| 1051 | |
| 1052 | /* If this is a weak symbol, and there is a real definition, the |
| 1053 | processor independent code will have arranged for us to see the |
| 1054 | real definition first, and we can just use the same value. */ |
| 1055 | if (h->weakdef != NULL) |
| 1056 | { |
| 1057 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1058 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1059 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1060 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1061 | return true; |
| 1062 | } |
| 1063 | |
| 1064 | /* This is a reference to a symbol defined by a dynamic object which |
| 1065 | is not a function. */ |
| 1066 | |
| 1067 | /* If we are creating a shared library, we must presume that the |
| 1068 | only references to the symbol are via the global offset table. |
| 1069 | For such cases we need not do anything here; the relocations will |
| 1070 | be handled correctly by relocate_section. */ |
| 1071 | if (info->shared) |
| 1072 | return true; |
| 1073 | |
| 1074 | /* If there are no references to this symbol that do not use the |
| 1075 | GOT, we don't need to generate a copy reloc. */ |
| 1076 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 1077 | return true; |
| 1078 | |
| 1079 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1080 | if (info->nocopyreloc) |
| 1081 | { |
| 1082 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1083 | return true; |
| 1084 | } |
| 1085 | |
| 1086 | eh = (struct elf_s390_link_hash_entry *) h; |
| 1087 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1088 | { |
| 1089 | s = p->sec->output_section; |
| 1090 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1091 | break; |
| 1092 | } |
| 1093 | |
| 1094 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1095 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1096 | if (p == NULL) |
| 1097 | { |
| 1098 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1099 | return true; |
| 1100 | } |
| 1101 | |
| 1102 | /* We must allocate the symbol in our .dynbss section, which will |
| 1103 | become part of the .bss section of the executable. There will be |
| 1104 | an entry for this symbol in the .dynsym section. The dynamic |
| 1105 | object will contain position independent code, so all references |
| 1106 | from the dynamic object to this symbol will go through the global |
| 1107 | offset table. The dynamic linker will use the .dynsym entry to |
| 1108 | determine the address it must put in the global offset table, so |
| 1109 | both the dynamic object and the regular object will refer to the |
| 1110 | same memory location for the variable. */ |
| 1111 | |
| 1112 | htab = elf_s390_hash_table (info); |
| 1113 | |
| 1114 | /* We must generate a R_390_COPY reloc to tell the dynamic linker to |
| 1115 | copy the initial value out of the dynamic object and into the |
| 1116 | runtime process image. */ |
| 1117 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1118 | { |
| 1119 | htab->srelbss->_raw_size += sizeof (Elf64_External_Rela); |
| 1120 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 1121 | } |
| 1122 | |
| 1123 | /* We need to figure out the alignment required for this symbol. I |
| 1124 | have no idea how ELF linkers handle this. */ |
| 1125 | power_of_two = bfd_log2 (h->size); |
| 1126 | if (power_of_two > 3) |
| 1127 | power_of_two = 3; |
| 1128 | |
| 1129 | /* Apply the required alignment. */ |
| 1130 | s = htab->sdynbss; |
| 1131 | s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); |
| 1132 | if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
| 1133 | { |
| 1134 | if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
| 1135 | return false; |
| 1136 | } |
| 1137 | |
| 1138 | /* Define the symbol as being at this point in the section. */ |
| 1139 | h->root.u.def.section = s; |
| 1140 | h->root.u.def.value = s->_raw_size; |
| 1141 | |
| 1142 | /* Increment the section size to make room for the symbol. */ |
| 1143 | s->_raw_size += h->size; |
| 1144 | |
| 1145 | return true; |
| 1146 | } |
| 1147 | |
| 1148 | /* This is the condition under which elf_s390_finish_dynamic_symbol |
| 1149 | will be called from elflink.h. If elflink.h doesn't call our |
| 1150 | finish_dynamic_symbol routine, we'll need to do something about |
| 1151 | initializing any .plt and .got entries in elf_s390_relocate_section. */ |
| 1152 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ |
| 1153 | ((DYN) \ |
| 1154 | && ((INFO)->shared \ |
| 1155 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| 1156 | && ((H)->dynindx != -1 \ |
| 1157 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| 1158 | |
| 1159 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1160 | dynamic relocs. */ |
| 1161 | |
| 1162 | static boolean |
| 1163 | allocate_dynrelocs (h, inf) |
| 1164 | struct elf_link_hash_entry *h; |
| 1165 | PTR inf; |
| 1166 | { |
| 1167 | struct bfd_link_info *info; |
| 1168 | struct elf_s390_link_hash_table *htab; |
| 1169 | struct elf_s390_link_hash_entry *eh; |
| 1170 | struct elf_s390_dyn_relocs *p; |
| 1171 | |
| 1172 | if (h->root.type == bfd_link_hash_indirect) |
| 1173 | return true; |
| 1174 | |
| 1175 | if (h->root.type == bfd_link_hash_warning) |
| 1176 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1177 | |
| 1178 | info = (struct bfd_link_info *) inf; |
| 1179 | htab = elf_s390_hash_table (info); |
| 1180 | |
| 1181 | if (htab->elf.dynamic_sections_created |
| 1182 | && h->plt.refcount > 0) |
| 1183 | { |
| 1184 | /* Make sure this symbol is output as a dynamic symbol. |
| 1185 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1186 | if (h->dynindx == -1 |
| 1187 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1188 | { |
| 1189 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1190 | return false; |
| 1191 | } |
| 1192 | |
| 1193 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) |
| 1194 | { |
| 1195 | asection *s = htab->splt; |
| 1196 | |
| 1197 | /* If this is the first .plt entry, make room for the special |
| 1198 | first entry. */ |
| 1199 | if (s->_raw_size == 0) |
| 1200 | s->_raw_size += PLT_FIRST_ENTRY_SIZE; |
| 1201 | |
| 1202 | h->plt.offset = s->_raw_size; |
| 1203 | |
| 1204 | /* If this symbol is not defined in a regular file, and we are |
| 1205 | not generating a shared library, then set the symbol to this |
| 1206 | location in the .plt. This is required to make function |
| 1207 | pointers compare as equal between the normal executable and |
| 1208 | the shared library. */ |
| 1209 | if (! info->shared |
| 1210 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1211 | { |
| 1212 | h->root.u.def.section = s; |
| 1213 | h->root.u.def.value = h->plt.offset; |
| 1214 | } |
| 1215 | |
| 1216 | /* Make room for this entry. */ |
| 1217 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1218 | |
| 1219 | /* We also need to make an entry in the .got.plt section, which |
| 1220 | will be placed in the .got section by the linker script. */ |
| 1221 | htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; |
| 1222 | |
| 1223 | /* We also need to make an entry in the .rela.plt section. */ |
| 1224 | htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); |
| 1225 | } |
| 1226 | else |
| 1227 | { |
| 1228 | h->plt.offset = (bfd_vma) -1; |
| 1229 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1230 | } |
| 1231 | } |
| 1232 | else |
| 1233 | { |
| 1234 | h->plt.offset = (bfd_vma) -1; |
| 1235 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1236 | } |
| 1237 | |
| 1238 | if (h->got.refcount > 0) |
| 1239 | { |
| 1240 | asection *s; |
| 1241 | boolean dyn; |
| 1242 | |
| 1243 | /* Make sure this symbol is output as a dynamic symbol. |
| 1244 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1245 | if (h->dynindx == -1 |
| 1246 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1247 | { |
| 1248 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1249 | return false; |
| 1250 | } |
| 1251 | |
| 1252 | s = htab->sgot; |
| 1253 | h->got.offset = s->_raw_size; |
| 1254 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1255 | dyn = htab->elf.dynamic_sections_created; |
| 1256 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) |
| 1257 | htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| 1258 | } |
| 1259 | else |
| 1260 | h->got.offset = (bfd_vma) -1; |
| 1261 | |
| 1262 | eh = (struct elf_s390_link_hash_entry *) h; |
| 1263 | if (eh->dyn_relocs == NULL) |
| 1264 | return true; |
| 1265 | |
| 1266 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1267 | dynamic pc-relative relocs against symbols which turn out to be |
| 1268 | defined in regular objects. For the normal shared case, discard |
| 1269 | space for pc-relative relocs that have become local due to symbol |
| 1270 | visibility changes. */ |
| 1271 | |
| 1272 | if (info->shared) |
| 1273 | { |
| 1274 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
| 1275 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 |
| 1276 | || info->symbolic)) |
| 1277 | { |
| 1278 | struct elf_s390_dyn_relocs **pp; |
| 1279 | |
| 1280 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1281 | { |
| 1282 | p->count -= p->pc_count; |
| 1283 | p->pc_count = 0; |
| 1284 | if (p->count == 0) |
| 1285 | *pp = p->next; |
| 1286 | else |
| 1287 | pp = &p->next; |
| 1288 | } |
| 1289 | } |
| 1290 | } |
| 1291 | else |
| 1292 | { |
| 1293 | /* For the non-shared case, discard space for relocs against |
| 1294 | symbols which turn out to need copy relocs or are not |
| 1295 | dynamic. */ |
| 1296 | |
| 1297 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1298 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1299 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1300 | || (htab->elf.dynamic_sections_created |
| 1301 | && (h->root.type == bfd_link_hash_undefweak |
| 1302 | || h->root.type == bfd_link_hash_undefined)))) |
| 1303 | { |
| 1304 | /* Make sure this symbol is output as a dynamic symbol. |
| 1305 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1306 | if (h->dynindx == -1 |
| 1307 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1308 | { |
| 1309 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1310 | return false; |
| 1311 | } |
| 1312 | |
| 1313 | /* If that succeeded, we know we'll be keeping all the |
| 1314 | relocs. */ |
| 1315 | if (h->dynindx != -1) |
| 1316 | goto keep; |
| 1317 | } |
| 1318 | |
| 1319 | eh->dyn_relocs = NULL; |
| 1320 | |
| 1321 | keep: ; |
| 1322 | } |
| 1323 | |
| 1324 | /* Finally, allocate space. */ |
| 1325 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1326 | { |
| 1327 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1328 | sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); |
| 1329 | } |
| 1330 | |
| 1331 | return true; |
| 1332 | } |
| 1333 | |
| 1334 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1335 | |
| 1336 | static boolean |
| 1337 | readonly_dynrelocs (h, inf) |
| 1338 | struct elf_link_hash_entry *h; |
| 1339 | PTR inf; |
| 1340 | { |
| 1341 | struct elf_s390_link_hash_entry *eh; |
| 1342 | struct elf_s390_dyn_relocs *p; |
| 1343 | |
| 1344 | if (h->root.type == bfd_link_hash_warning) |
| 1345 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1346 | |
| 1347 | eh = (struct elf_s390_link_hash_entry *) h; |
| 1348 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1349 | { |
| 1350 | asection *s = p->sec->output_section; |
| 1351 | |
| 1352 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1353 | { |
| 1354 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1355 | |
| 1356 | info->flags |= DF_TEXTREL; |
| 1357 | |
| 1358 | /* Not an error, just cut short the traversal. */ |
| 1359 | return false; |
| 1360 | } |
| 1361 | } |
| 1362 | return true; |
| 1363 | } |
| 1364 | |
| 1365 | /* Set the sizes of the dynamic sections. */ |
| 1366 | |
| 1367 | static boolean |
| 1368 | elf_s390_size_dynamic_sections (output_bfd, info) |
| 1369 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 1370 | struct bfd_link_info *info; |
| 1371 | { |
| 1372 | struct elf_s390_link_hash_table *htab; |
| 1373 | bfd *dynobj; |
| 1374 | asection *s; |
| 1375 | boolean relocs; |
| 1376 | bfd *ibfd; |
| 1377 | |
| 1378 | htab = elf_s390_hash_table (info); |
| 1379 | dynobj = htab->elf.dynobj; |
| 1380 | if (dynobj == NULL) |
| 1381 | abort (); |
| 1382 | |
| 1383 | if (htab->elf.dynamic_sections_created) |
| 1384 | { |
| 1385 | /* Set the contents of the .interp section to the interpreter. */ |
| 1386 | if (! info->shared) |
| 1387 | { |
| 1388 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1389 | if (s == NULL) |
| 1390 | abort (); |
| 1391 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1392 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1393 | } |
| 1394 | } |
| 1395 | |
| 1396 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1397 | relocs. */ |
| 1398 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1399 | { |
| 1400 | bfd_signed_vma *local_got; |
| 1401 | bfd_signed_vma *end_local_got; |
| 1402 | bfd_size_type locsymcount; |
| 1403 | Elf_Internal_Shdr *symtab_hdr; |
| 1404 | asection *srela; |
| 1405 | |
| 1406 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1407 | continue; |
| 1408 | |
| 1409 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1410 | { |
| 1411 | struct elf_s390_dyn_relocs *p; |
| 1412 | |
| 1413 | for (p = *((struct elf_s390_dyn_relocs **) |
| 1414 | &elf_section_data (s)->local_dynrel); |
| 1415 | p != NULL; |
| 1416 | p = p->next) |
| 1417 | { |
| 1418 | if (!bfd_is_abs_section (p->sec) |
| 1419 | && bfd_is_abs_section (p->sec->output_section)) |
| 1420 | { |
| 1421 | /* Input section has been discarded, either because |
| 1422 | it is a copy of a linkonce section or due to |
| 1423 | linker script /DISCARD/, so we'll be discarding |
| 1424 | the relocs too. */ |
| 1425 | } |
| 1426 | else if (p->count != 0) |
| 1427 | { |
| 1428 | srela = elf_section_data (p->sec)->sreloc; |
| 1429 | srela->_raw_size += p->count * sizeof (Elf64_External_Rela); |
| 1430 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1431 | info->flags |= DF_TEXTREL; |
| 1432 | } |
| 1433 | } |
| 1434 | } |
| 1435 | |
| 1436 | local_got = elf_local_got_refcounts (ibfd); |
| 1437 | if (!local_got) |
| 1438 | continue; |
| 1439 | |
| 1440 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1441 | locsymcount = symtab_hdr->sh_info; |
| 1442 | end_local_got = local_got + locsymcount; |
| 1443 | s = htab->sgot; |
| 1444 | srela = htab->srelgot; |
| 1445 | for (; local_got < end_local_got; ++local_got) |
| 1446 | { |
| 1447 | if (*local_got > 0) |
| 1448 | { |
| 1449 | *local_got = s->_raw_size; |
| 1450 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1451 | if (info->shared) |
| 1452 | srela->_raw_size += sizeof (Elf64_External_Rela); |
| 1453 | } |
| 1454 | else |
| 1455 | *local_got = (bfd_vma) -1; |
| 1456 | } |
| 1457 | } |
| 1458 | |
| 1459 | /* Allocate global sym .plt and .got entries, and space for global |
| 1460 | sym dynamic relocs. */ |
| 1461 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 1462 | |
| 1463 | /* We now have determined the sizes of the various dynamic sections. |
| 1464 | Allocate memory for them. */ |
| 1465 | relocs = false; |
| 1466 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1467 | { |
| 1468 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1469 | continue; |
| 1470 | |
| 1471 | if (s == htab->splt |
| 1472 | || s == htab->sgot |
| 1473 | || s == htab->sgotplt) |
| 1474 | { |
| 1475 | /* Strip this section if we don't need it; see the |
| 1476 | comment below. */ |
| 1477 | } |
| 1478 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) |
| 1479 | { |
| 1480 | if (s->_raw_size != 0 && s != htab->srelplt) |
| 1481 | relocs = true; |
| 1482 | |
| 1483 | /* We use the reloc_count field as a counter if we need |
| 1484 | to copy relocs into the output file. */ |
| 1485 | s->reloc_count = 0; |
| 1486 | } |
| 1487 | else |
| 1488 | { |
| 1489 | /* It's not one of our sections, so don't allocate space. */ |
| 1490 | continue; |
| 1491 | } |
| 1492 | |
| 1493 | if (s->_raw_size == 0) |
| 1494 | { |
| 1495 | /* If we don't need this section, strip it from the |
| 1496 | output file. This is to handle .rela.bss and |
| 1497 | .rela.plt. We must create it in |
| 1498 | create_dynamic_sections, because it must be created |
| 1499 | before the linker maps input sections to output |
| 1500 | sections. The linker does that before |
| 1501 | adjust_dynamic_symbol is called, and it is that |
| 1502 | function which decides whether anything needs to go |
| 1503 | into these sections. */ |
| 1504 | |
| 1505 | _bfd_strip_section_from_output (info, s); |
| 1506 | continue; |
| 1507 | } |
| 1508 | |
| 1509 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1510 | here in case unused entries are not reclaimed before the |
| 1511 | section's contents are written out. This should not happen, |
| 1512 | but this way if it does, we get a R_390_NONE reloc instead |
| 1513 | of garbage. */ |
| 1514 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1515 | if (s->contents == NULL) |
| 1516 | return false; |
| 1517 | } |
| 1518 | |
| 1519 | if (htab->elf.dynamic_sections_created) |
| 1520 | { |
| 1521 | /* Add some entries to the .dynamic section. We fill in the |
| 1522 | values later, in elf_s390_finish_dynamic_sections, but we |
| 1523 | must add the entries now so that we get the correct size for |
| 1524 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1525 | dynamic linker and used by the debugger. */ |
| 1526 | #define add_dynamic_entry(TAG, VAL) \ |
| 1527 | bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) |
| 1528 | |
| 1529 | if (! info->shared) |
| 1530 | { |
| 1531 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1532 | return false; |
| 1533 | } |
| 1534 | |
| 1535 | if (htab->splt->_raw_size != 0) |
| 1536 | { |
| 1537 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1538 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1539 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1540 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1541 | return false; |
| 1542 | } |
| 1543 | |
| 1544 | if (relocs) |
| 1545 | { |
| 1546 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1547 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1548 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) |
| 1549 | return false; |
| 1550 | |
| 1551 | /* If any dynamic relocs apply to a read-only section, |
| 1552 | then we need a DT_TEXTREL entry. */ |
| 1553 | if ((info->flags & DF_TEXTREL) == 0) |
| 1554 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 1555 | (PTR) info); |
| 1556 | |
| 1557 | if ((info->flags & DF_TEXTREL) != 0) |
| 1558 | { |
| 1559 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1560 | return false; |
| 1561 | } |
| 1562 | } |
| 1563 | } |
| 1564 | #undef add_dynamic_entry |
| 1565 | |
| 1566 | return true; |
| 1567 | } |
| 1568 | |
| 1569 | /* Relocate a 390 ELF section. */ |
| 1570 | |
| 1571 | static boolean |
| 1572 | elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1573 | contents, relocs, local_syms, local_sections) |
| 1574 | bfd *output_bfd; |
| 1575 | struct bfd_link_info *info; |
| 1576 | bfd *input_bfd; |
| 1577 | asection *input_section; |
| 1578 | bfd_byte *contents; |
| 1579 | Elf_Internal_Rela *relocs; |
| 1580 | Elf_Internal_Sym *local_syms; |
| 1581 | asection **local_sections; |
| 1582 | { |
| 1583 | struct elf_s390_link_hash_table *htab; |
| 1584 | Elf_Internal_Shdr *symtab_hdr; |
| 1585 | struct elf_link_hash_entry **sym_hashes; |
| 1586 | bfd_vma *local_got_offsets; |
| 1587 | Elf_Internal_Rela *rel; |
| 1588 | Elf_Internal_Rela *relend; |
| 1589 | |
| 1590 | htab = elf_s390_hash_table (info); |
| 1591 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1592 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1593 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1594 | |
| 1595 | rel = relocs; |
| 1596 | relend = relocs + input_section->reloc_count; |
| 1597 | for (; rel < relend; rel++) |
| 1598 | { |
| 1599 | int r_type; |
| 1600 | reloc_howto_type *howto; |
| 1601 | unsigned long r_symndx; |
| 1602 | struct elf_link_hash_entry *h; |
| 1603 | Elf_Internal_Sym *sym; |
| 1604 | asection *sec; |
| 1605 | bfd_vma off; |
| 1606 | bfd_vma relocation; |
| 1607 | boolean unresolved_reloc; |
| 1608 | bfd_reloc_status_type r; |
| 1609 | |
| 1610 | r_type = ELF64_R_TYPE (rel->r_info); |
| 1611 | if (r_type == (int) R_390_GNU_VTINHERIT |
| 1612 | || r_type == (int) R_390_GNU_VTENTRY) |
| 1613 | continue; |
| 1614 | if (r_type < 0 || r_type >= (int) R_390_max) |
| 1615 | { |
| 1616 | bfd_set_error (bfd_error_bad_value); |
| 1617 | return false; |
| 1618 | } |
| 1619 | howto = elf_howto_table + r_type; |
| 1620 | |
| 1621 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 1622 | |
| 1623 | if (info->relocateable) |
| 1624 | { |
| 1625 | /* This is a relocateable link. We don't have to change |
| 1626 | anything, unless the reloc is against a section symbol, |
| 1627 | in which case we have to adjust according to where the |
| 1628 | section symbol winds up in the output section. */ |
| 1629 | if (r_symndx < symtab_hdr->sh_info) |
| 1630 | { |
| 1631 | sym = local_syms + r_symndx; |
| 1632 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1633 | { |
| 1634 | sec = local_sections[r_symndx]; |
| 1635 | rel->r_addend += sec->output_offset + sym->st_value; |
| 1636 | } |
| 1637 | } |
| 1638 | |
| 1639 | continue; |
| 1640 | } |
| 1641 | |
| 1642 | /* This is a final link. */ |
| 1643 | h = NULL; |
| 1644 | sym = NULL; |
| 1645 | sec = NULL; |
| 1646 | unresolved_reloc = false; |
| 1647 | if (r_symndx < symtab_hdr->sh_info) |
| 1648 | { |
| 1649 | sym = local_syms + r_symndx; |
| 1650 | sec = local_sections[r_symndx]; |
| 1651 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 1652 | } |
| 1653 | else |
| 1654 | { |
| 1655 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1656 | while (h->root.type == bfd_link_hash_indirect |
| 1657 | || h->root.type == bfd_link_hash_warning) |
| 1658 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1659 | |
| 1660 | if (h->root.type == bfd_link_hash_defined |
| 1661 | || h->root.type == bfd_link_hash_defweak) |
| 1662 | { |
| 1663 | sec = h->root.u.def.section; |
| 1664 | if (sec->output_section == NULL) |
| 1665 | { |
| 1666 | /* Set a flag that will be cleared later if we find a |
| 1667 | relocation value for this symbol. output_section |
| 1668 | is typically NULL for symbols satisfied by a shared |
| 1669 | library. */ |
| 1670 | unresolved_reloc = true; |
| 1671 | relocation = 0; |
| 1672 | } |
| 1673 | else |
| 1674 | relocation = (h->root.u.def.value |
| 1675 | + sec->output_section->vma |
| 1676 | + sec->output_offset); |
| 1677 | } |
| 1678 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1679 | relocation = 0; |
| 1680 | else if (info->shared |
| 1681 | && (!info->symbolic || info->allow_shlib_undefined) |
| 1682 | && !info->no_undefined |
| 1683 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 1684 | relocation = 0; |
| 1685 | else |
| 1686 | { |
| 1687 | if (! ((*info->callbacks->undefined_symbol) |
| 1688 | (info, h->root.root.string, input_bfd, |
| 1689 | input_section, rel->r_offset, |
| 1690 | (!info->shared || info->no_undefined |
| 1691 | || ELF_ST_VISIBILITY (h->other))))) |
| 1692 | return false; |
| 1693 | relocation = 0; |
| 1694 | } |
| 1695 | } |
| 1696 | |
| 1697 | switch (r_type) |
| 1698 | { |
| 1699 | case R_390_GOT12: |
| 1700 | case R_390_GOT16: |
| 1701 | case R_390_GOT32: |
| 1702 | case R_390_GOT64: |
| 1703 | case R_390_GOTENT: |
| 1704 | /* Relocation is to the entry for this symbol in the global |
| 1705 | offset table. */ |
| 1706 | if (htab->sgot == NULL) |
| 1707 | abort (); |
| 1708 | |
| 1709 | if (h != NULL) |
| 1710 | { |
| 1711 | boolean dyn; |
| 1712 | |
| 1713 | off = h->got.offset; |
| 1714 | dyn = htab->elf.dynamic_sections_created; |
| 1715 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) |
| 1716 | || (info->shared |
| 1717 | && (info->symbolic |
| 1718 | || h->dynindx == -1 |
| 1719 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 1720 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1721 | { |
| 1722 | /* This is actually a static link, or it is a |
| 1723 | -Bsymbolic link and the symbol is defined |
| 1724 | locally, or the symbol was forced to be local |
| 1725 | because of a version file. We must initialize |
| 1726 | this entry in the global offset table. Since the |
| 1727 | offset must always be a multiple of 2, we use the |
| 1728 | least significant bit to record whether we have |
| 1729 | initialized it already. |
| 1730 | |
| 1731 | When doing a dynamic link, we create a .rel.got |
| 1732 | relocation entry to initialize the value. This |
| 1733 | is done in the finish_dynamic_symbol routine. */ |
| 1734 | if ((off & 1) != 0) |
| 1735 | off &= ~1; |
| 1736 | else |
| 1737 | { |
| 1738 | bfd_put_64 (output_bfd, relocation, |
| 1739 | htab->sgot->contents + off); |
| 1740 | h->got.offset |= 1; |
| 1741 | } |
| 1742 | } |
| 1743 | else |
| 1744 | unresolved_reloc = false; |
| 1745 | } |
| 1746 | else |
| 1747 | { |
| 1748 | if (local_got_offsets == NULL) |
| 1749 | abort (); |
| 1750 | |
| 1751 | off = local_got_offsets[r_symndx]; |
| 1752 | |
| 1753 | /* The offset must always be a multiple of 8. We use |
| 1754 | the least significant bit to record whether we have |
| 1755 | already generated the necessary reloc. */ |
| 1756 | if ((off & 1) != 0) |
| 1757 | off &= ~1; |
| 1758 | else |
| 1759 | { |
| 1760 | bfd_put_64 (output_bfd, relocation, |
| 1761 | htab->sgot->contents + off); |
| 1762 | |
| 1763 | if (info->shared) |
| 1764 | { |
| 1765 | asection *srelgot; |
| 1766 | Elf_Internal_Rela outrel; |
| 1767 | Elf64_External_Rela *loc; |
| 1768 | |
| 1769 | srelgot = htab->srelgot; |
| 1770 | if (srelgot == NULL) |
| 1771 | abort (); |
| 1772 | |
| 1773 | outrel.r_offset = (htab->sgot->output_section->vma |
| 1774 | + htab->sgot->output_offset |
| 1775 | + off); |
| 1776 | outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| 1777 | outrel.r_addend = relocation; |
| 1778 | loc = (Elf64_External_Rela *) srelgot->contents; |
| 1779 | loc += srelgot->reloc_count++; |
| 1780 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 1781 | } |
| 1782 | |
| 1783 | local_got_offsets[r_symndx] |= 1; |
| 1784 | } |
| 1785 | } |
| 1786 | |
| 1787 | if (off >= (bfd_vma) -2) |
| 1788 | abort (); |
| 1789 | |
| 1790 | relocation = htab->sgot->output_offset + off; |
| 1791 | |
| 1792 | /* |
| 1793 | * For @GOTENT the relocation is against the offset between |
| 1794 | * the instruction and the symbols entry in the GOT and not |
| 1795 | * between the start of the GOT and the symbols entry. We |
| 1796 | * add the vma of the GOT to get the correct value. |
| 1797 | */ |
| 1798 | if (r_type == R_390_GOTENT) |
| 1799 | relocation += htab->sgot->output_section->vma; |
| 1800 | |
| 1801 | break; |
| 1802 | |
| 1803 | case R_390_GOTOFF: |
| 1804 | /* Relocation is relative to the start of the global offset |
| 1805 | table. */ |
| 1806 | |
| 1807 | /* Note that sgot->output_offset is not involved in this |
| 1808 | calculation. We always want the start of .got. If we |
| 1809 | defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1810 | permitted by the ABI, we might have to change this |
| 1811 | calculation. */ |
| 1812 | relocation -= htab->sgot->output_section->vma; |
| 1813 | |
| 1814 | break; |
| 1815 | |
| 1816 | case R_390_GOTPC: |
| 1817 | case R_390_GOTPCDBL: |
| 1818 | /* Use global offset table as symbol value. */ |
| 1819 | relocation = htab->sgot->output_section->vma; |
| 1820 | unresolved_reloc = false; |
| 1821 | break; |
| 1822 | |
| 1823 | case R_390_PLT16DBL: |
| 1824 | case R_390_PLT32: |
| 1825 | case R_390_PLT32DBL: |
| 1826 | case R_390_PLT64: |
| 1827 | /* Relocation is to the entry for this symbol in the |
| 1828 | procedure linkage table. */ |
| 1829 | |
| 1830 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 1831 | without using the procedure linkage table. */ |
| 1832 | if (h == NULL) |
| 1833 | break; |
| 1834 | |
| 1835 | if (h->plt.offset == (bfd_vma) -1 |
| 1836 | || htab->splt == NULL) |
| 1837 | { |
| 1838 | /* We didn't make a PLT entry for this symbol. This |
| 1839 | happens when statically linking PIC code, or when |
| 1840 | using -Bsymbolic. */ |
| 1841 | break; |
| 1842 | } |
| 1843 | |
| 1844 | relocation = (htab->splt->output_section->vma |
| 1845 | + htab->splt->output_offset |
| 1846 | + h->plt.offset); |
| 1847 | unresolved_reloc = false; |
| 1848 | break; |
| 1849 | |
| 1850 | case R_390_8: |
| 1851 | case R_390_16: |
| 1852 | case R_390_32: |
| 1853 | case R_390_64: |
| 1854 | case R_390_PC16: |
| 1855 | case R_390_PC16DBL: |
| 1856 | case R_390_PC32: |
| 1857 | case R_390_PC32DBL: |
| 1858 | case R_390_PC64: |
| 1859 | /* r_symndx will be zero only for relocs against symbols |
| 1860 | from removed linkonce sections, or sections discarded by |
| 1861 | a linker script. */ |
| 1862 | if (r_symndx == 0 |
| 1863 | || (input_section->flags & SEC_ALLOC) == 0) |
| 1864 | break; |
| 1865 | |
| 1866 | if ((info->shared |
| 1867 | && ((r_type != R_390_PC16 |
| 1868 | && r_type != R_390_PC16DBL |
| 1869 | && r_type != R_390_PC32 |
| 1870 | && r_type != R_390_PC32DBL |
| 1871 | && r_type != R_390_PC64) |
| 1872 | || (h != NULL |
| 1873 | && h->dynindx != -1 |
| 1874 | && (! info->symbolic |
| 1875 | || (h->elf_link_hash_flags |
| 1876 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1877 | || (!info->shared |
| 1878 | && h != NULL |
| 1879 | && h->dynindx != -1 |
| 1880 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1881 | && (((h->elf_link_hash_flags |
| 1882 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1883 | && (h->elf_link_hash_flags |
| 1884 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1885 | || h->root.type == bfd_link_hash_undefweak |
| 1886 | || h->root.type == bfd_link_hash_undefined))) |
| 1887 | { |
| 1888 | Elf_Internal_Rela outrel; |
| 1889 | boolean skip, relocate; |
| 1890 | asection *sreloc; |
| 1891 | Elf64_External_Rela *loc; |
| 1892 | |
| 1893 | /* When generating a shared object, these relocations |
| 1894 | are copied into the output file to be resolved at run |
| 1895 | time. */ |
| 1896 | |
| 1897 | skip = false; |
| 1898 | relocate = false; |
| 1899 | |
| 1900 | outrel.r_offset = |
| 1901 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 1902 | rel->r_offset); |
| 1903 | if (outrel.r_offset == (bfd_vma) -1) |
| 1904 | skip = true; |
| 1905 | else if (outrel.r_offset == (bfd_vma) -2) |
| 1906 | skip = true, relocate = true; |
| 1907 | |
| 1908 | outrel.r_offset += (input_section->output_section->vma |
| 1909 | + input_section->output_offset); |
| 1910 | |
| 1911 | if (skip) |
| 1912 | memset (&outrel, 0, sizeof outrel); |
| 1913 | else if (h != NULL |
| 1914 | && h->dynindx != -1 |
| 1915 | && (r_type == R_390_PC16 |
| 1916 | || r_type == R_390_PC16DBL |
| 1917 | || r_type == R_390_PC32 |
| 1918 | || r_type == R_390_PC32DBL |
| 1919 | || r_type == R_390_PC64 |
| 1920 | || !info->shared |
| 1921 | || !info->symbolic |
| 1922 | || (h->elf_link_hash_flags |
| 1923 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1924 | { |
| 1925 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
| 1926 | outrel.r_addend = rel->r_addend; |
| 1927 | } |
| 1928 | else |
| 1929 | { |
| 1930 | /* This symbol is local, or marked to become local. */ |
| 1931 | relocate = true; |
| 1932 | outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| 1933 | outrel.r_addend = relocation + rel->r_addend; |
| 1934 | } |
| 1935 | |
| 1936 | sreloc = elf_section_data (input_section)->sreloc; |
| 1937 | if (sreloc == NULL) |
| 1938 | abort (); |
| 1939 | |
| 1940 | loc = (Elf64_External_Rela *) sreloc->contents; |
| 1941 | loc += sreloc->reloc_count++; |
| 1942 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 1943 | |
| 1944 | /* If this reloc is against an external symbol, we do |
| 1945 | not want to fiddle with the addend. Otherwise, we |
| 1946 | need to include the symbol value so that it becomes |
| 1947 | an addend for the dynamic reloc. */ |
| 1948 | if (! relocate) |
| 1949 | continue; |
| 1950 | } |
| 1951 | |
| 1952 | break; |
| 1953 | |
| 1954 | default: |
| 1955 | break; |
| 1956 | } |
| 1957 | |
| 1958 | if (unresolved_reloc |
| 1959 | && !(info->shared |
| 1960 | && (input_section->flags & SEC_DEBUGGING) != 0 |
| 1961 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 1962 | (*_bfd_error_handler) |
| 1963 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 1964 | bfd_archive_filename (input_bfd), |
| 1965 | bfd_get_section_name (input_bfd, input_section), |
| 1966 | (long) rel->r_offset, |
| 1967 | h->root.root.string); |
| 1968 | |
| 1969 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1970 | contents, rel->r_offset, |
| 1971 | relocation, rel->r_addend); |
| 1972 | |
| 1973 | if (r != bfd_reloc_ok) |
| 1974 | { |
| 1975 | const char *name; |
| 1976 | |
| 1977 | if (h != NULL) |
| 1978 | name = h->root.root.string; |
| 1979 | else |
| 1980 | { |
| 1981 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1982 | symtab_hdr->sh_link, |
| 1983 | sym->st_name); |
| 1984 | if (name == NULL) |
| 1985 | return false; |
| 1986 | if (*name == '\0') |
| 1987 | name = bfd_section_name (input_bfd, sec); |
| 1988 | } |
| 1989 | |
| 1990 | if (r == bfd_reloc_overflow) |
| 1991 | { |
| 1992 | |
| 1993 | if (! ((*info->callbacks->reloc_overflow) |
| 1994 | (info, name, howto->name, (bfd_vma) 0, |
| 1995 | input_bfd, input_section, rel->r_offset))) |
| 1996 | return false; |
| 1997 | } |
| 1998 | else |
| 1999 | { |
| 2000 | (*_bfd_error_handler) |
| 2001 | (_("%s(%s+0x%lx): reloc against `%s': error %d"), |
| 2002 | bfd_archive_filename (input_bfd), |
| 2003 | bfd_get_section_name (input_bfd, input_section), |
| 2004 | (long) rel->r_offset, name, (int) r); |
| 2005 | return false; |
| 2006 | } |
| 2007 | } |
| 2008 | } |
| 2009 | |
| 2010 | return true; |
| 2011 | } |
| 2012 | |
| 2013 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2014 | dynamic sections here. */ |
| 2015 | |
| 2016 | static boolean |
| 2017 | elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 2018 | bfd *output_bfd; |
| 2019 | struct bfd_link_info *info; |
| 2020 | struct elf_link_hash_entry *h; |
| 2021 | Elf_Internal_Sym *sym; |
| 2022 | { |
| 2023 | struct elf_s390_link_hash_table *htab; |
| 2024 | |
| 2025 | htab = elf_s390_hash_table (info); |
| 2026 | |
| 2027 | if (h->plt.offset != (bfd_vma) -1) |
| 2028 | { |
| 2029 | bfd_vma plt_index; |
| 2030 | bfd_vma got_offset; |
| 2031 | Elf_Internal_Rela rela; |
| 2032 | Elf64_External_Rela *loc; |
| 2033 | |
| 2034 | /* This symbol has an entry in the procedure linkage table. Set |
| 2035 | it up. */ |
| 2036 | |
| 2037 | if (h->dynindx == -1 |
| 2038 | || htab->splt == NULL |
| 2039 | || htab->sgotplt == NULL |
| 2040 | || htab->srelplt == NULL) |
| 2041 | abort (); |
| 2042 | |
| 2043 | /* Calc. index no. |
| 2044 | Current offset - size first entry / entry size. */ |
| 2045 | plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; |
| 2046 | |
| 2047 | /* Offset in GOT is PLT index plus GOT headers(3) times 8, |
| 2048 | addr & GOT addr. */ |
| 2049 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2050 | |
| 2051 | /* Fill in the blueprint of a PLT. */ |
| 2052 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, |
| 2053 | htab->splt->contents + h->plt.offset); |
| 2054 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, |
| 2055 | htab->splt->contents + h->plt.offset + 4); |
| 2056 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, |
| 2057 | htab->splt->contents + h->plt.offset + 8); |
| 2058 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, |
| 2059 | htab->splt->contents + h->plt.offset + 12); |
| 2060 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, |
| 2061 | htab->splt->contents + h->plt.offset + 16); |
| 2062 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, |
| 2063 | htab->splt->contents + h->plt.offset + 20); |
| 2064 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, |
| 2065 | htab->splt->contents + h->plt.offset + 24); |
| 2066 | bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, |
| 2067 | htab->splt->contents + h->plt.offset + 28); |
| 2068 | /* Fixup the relative address to the GOT entry */ |
| 2069 | bfd_put_32 (output_bfd, |
| 2070 | (htab->sgotplt->output_section->vma + |
| 2071 | htab->sgotplt->output_offset + got_offset |
| 2072 | - (htab->splt->output_section->vma + h->plt.offset))/2, |
| 2073 | htab->splt->contents + h->plt.offset + 2); |
| 2074 | /* Fixup the relative branch to PLT 0 */ |
| 2075 | bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + |
| 2076 | (PLT_ENTRY_SIZE * plt_index) + 22)/2, |
| 2077 | htab->splt->contents + h->plt.offset + 24); |
| 2078 | /* Fixup offset into symbol table */ |
| 2079 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), |
| 2080 | htab->splt->contents + h->plt.offset + 28); |
| 2081 | |
| 2082 | /* Fill in the entry in the global offset table. |
| 2083 | Points to instruction after GOT offset. */ |
| 2084 | bfd_put_64 (output_bfd, |
| 2085 | (htab->splt->output_section->vma |
| 2086 | + htab->splt->output_offset |
| 2087 | + h->plt.offset |
| 2088 | + 14), |
| 2089 | htab->sgotplt->contents + got_offset); |
| 2090 | |
| 2091 | /* Fill in the entry in the .rela.plt section. */ |
| 2092 | rela.r_offset = (htab->sgotplt->output_section->vma |
| 2093 | + htab->sgotplt->output_offset |
| 2094 | + got_offset); |
| 2095 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); |
| 2096 | rela.r_addend = 0; |
| 2097 | loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index; |
| 2098 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2099 | |
| 2100 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2101 | { |
| 2102 | /* Mark the symbol as undefined, rather than as defined in |
| 2103 | the .plt section. Leave the value alone. This is a clue |
| 2104 | for the dynamic linker, to make function pointer |
| 2105 | comparisons work between an application and shared |
| 2106 | library. */ |
| 2107 | sym->st_shndx = SHN_UNDEF; |
| 2108 | } |
| 2109 | } |
| 2110 | |
| 2111 | if (h->got.offset != (bfd_vma) -1) |
| 2112 | { |
| 2113 | Elf_Internal_Rela rela; |
| 2114 | Elf64_External_Rela *loc; |
| 2115 | |
| 2116 | /* This symbol has an entry in the global offset table. Set it |
| 2117 | up. */ |
| 2118 | |
| 2119 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 2120 | abort (); |
| 2121 | |
| 2122 | rela.r_offset = (htab->sgot->output_section->vma |
| 2123 | + htab->sgot->output_offset |
| 2124 | + (h->got.offset &~ (bfd_vma) 1)); |
| 2125 | |
| 2126 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 2127 | symbol is defined locally or was forced to be local because |
| 2128 | of a version file, we just want to emit a RELATIVE reloc. |
| 2129 | The entry in the global offset table will already have been |
| 2130 | initialized in the relocate_section function. */ |
| 2131 | if (info->shared |
| 2132 | && (info->symbolic |
| 2133 | || h->dynindx == -1 |
| 2134 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 2135 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 2136 | { |
| 2137 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2138 | rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| 2139 | rela.r_addend = (h->root.u.def.value |
| 2140 | + h->root.u.def.section->output_section->vma |
| 2141 | + h->root.u.def.section->output_offset); |
| 2142 | } |
| 2143 | else |
| 2144 | { |
| 2145 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2146 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); |
| 2147 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); |
| 2148 | rela.r_addend = 0; |
| 2149 | } |
| 2150 | |
| 2151 | loc = (Elf64_External_Rela *) htab->srelgot->contents; |
| 2152 | loc += htab->srelgot->reloc_count++; |
| 2153 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2154 | } |
| 2155 | |
| 2156 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 2157 | { |
| 2158 | Elf_Internal_Rela rela; |
| 2159 | Elf64_External_Rela *loc; |
| 2160 | |
| 2161 | /* This symbols needs a copy reloc. Set it up. */ |
| 2162 | |
| 2163 | if (h->dynindx == -1 |
| 2164 | || (h->root.type != bfd_link_hash_defined |
| 2165 | && h->root.type != bfd_link_hash_defweak) |
| 2166 | || htab->srelbss == NULL) |
| 2167 | abort (); |
| 2168 | |
| 2169 | rela.r_offset = (h->root.u.def.value |
| 2170 | + h->root.u.def.section->output_section->vma |
| 2171 | + h->root.u.def.section->output_offset); |
| 2172 | rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); |
| 2173 | rela.r_addend = 0; |
| 2174 | loc = (Elf64_External_Rela *) htab->srelbss->contents; |
| 2175 | loc += htab->srelbss->reloc_count++; |
| 2176 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2177 | } |
| 2178 | |
| 2179 | /* Mark some specially defined symbols as absolute. */ |
| 2180 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2181 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 |
| 2182 | || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) |
| 2183 | sym->st_shndx = SHN_ABS; |
| 2184 | |
| 2185 | return true; |
| 2186 | } |
| 2187 | |
| 2188 | /* Used to decide how to sort relocs in an optimal manner for the |
| 2189 | dynamic linker, before writing them out. */ |
| 2190 | |
| 2191 | static enum elf_reloc_type_class |
| 2192 | elf_s390_reloc_type_class (rela) |
| 2193 | const Elf_Internal_Rela *rela; |
| 2194 | { |
| 2195 | switch ((int) ELF64_R_TYPE (rela->r_info)) |
| 2196 | { |
| 2197 | case R_390_RELATIVE: |
| 2198 | return reloc_class_relative; |
| 2199 | case R_390_JMP_SLOT: |
| 2200 | return reloc_class_plt; |
| 2201 | case R_390_COPY: |
| 2202 | return reloc_class_copy; |
| 2203 | default: |
| 2204 | return reloc_class_normal; |
| 2205 | } |
| 2206 | } |
| 2207 | |
| 2208 | /* Finish up the dynamic sections. */ |
| 2209 | |
| 2210 | static boolean |
| 2211 | elf_s390_finish_dynamic_sections (output_bfd, info) |
| 2212 | bfd *output_bfd; |
| 2213 | struct bfd_link_info *info; |
| 2214 | { |
| 2215 | struct elf_s390_link_hash_table *htab; |
| 2216 | bfd *dynobj; |
| 2217 | asection *sdyn; |
| 2218 | |
| 2219 | htab = elf_s390_hash_table (info); |
| 2220 | dynobj = htab->elf.dynobj; |
| 2221 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2222 | |
| 2223 | if (htab->elf.dynamic_sections_created) |
| 2224 | { |
| 2225 | Elf64_External_Dyn *dyncon, *dynconend; |
| 2226 | |
| 2227 | if (sdyn == NULL || htab->sgot == NULL) |
| 2228 | abort (); |
| 2229 | |
| 2230 | dyncon = (Elf64_External_Dyn *) sdyn->contents; |
| 2231 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 2232 | for (; dyncon < dynconend; dyncon++) |
| 2233 | { |
| 2234 | Elf_Internal_Dyn dyn; |
| 2235 | asection *s; |
| 2236 | |
| 2237 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); |
| 2238 | |
| 2239 | switch (dyn.d_tag) |
| 2240 | { |
| 2241 | default: |
| 2242 | continue; |
| 2243 | |
| 2244 | case DT_PLTGOT: |
| 2245 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
| 2246 | break; |
| 2247 | |
| 2248 | case DT_JMPREL: |
| 2249 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 2250 | break; |
| 2251 | |
| 2252 | case DT_PLTRELSZ: |
| 2253 | s = htab->srelplt->output_section; |
| 2254 | if (s->_cooked_size != 0) |
| 2255 | dyn.d_un.d_val = s->_cooked_size; |
| 2256 | else |
| 2257 | dyn.d_un.d_val = s->_raw_size; |
| 2258 | break; |
| 2259 | |
| 2260 | case DT_RELASZ: |
| 2261 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 2262 | not be included in the overall relocs (DT_RELA). |
| 2263 | Therefore, we override the DT_RELASZ entry here to |
| 2264 | make it not include the JMPREL relocs. Since the |
| 2265 | linker script arranges for .rela.plt to follow all |
| 2266 | other relocation sections, we don't have to worry |
| 2267 | about changing the DT_RELA entry. */ |
| 2268 | s = htab->srelplt->output_section; |
| 2269 | if (s->_cooked_size != 0) |
| 2270 | dyn.d_un.d_val -= s->_cooked_size; |
| 2271 | else |
| 2272 | dyn.d_un.d_val -= s->_raw_size; |
| 2273 | break; |
| 2274 | } |
| 2275 | |
| 2276 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2277 | } |
| 2278 | |
| 2279 | /* Fill in the special first entry in the procedure linkage table. */ |
| 2280 | if (htab->splt && htab->splt->_raw_size > 0) |
| 2281 | { |
| 2282 | /* fill in blueprint for plt 0 entry */ |
| 2283 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, |
| 2284 | htab->splt->contents ); |
| 2285 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, |
| 2286 | htab->splt->contents +4 ); |
| 2287 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, |
| 2288 | htab->splt->contents +12 ); |
| 2289 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, |
| 2290 | htab->splt->contents +16 ); |
| 2291 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, |
| 2292 | htab->splt->contents +20 ); |
| 2293 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, |
| 2294 | htab->splt->contents + 24); |
| 2295 | bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, |
| 2296 | htab->splt->contents + 28 ); |
| 2297 | /* Fixup relative address to start of GOT */ |
| 2298 | bfd_put_32 (output_bfd, |
| 2299 | (htab->sgotplt->output_section->vma + |
| 2300 | htab->sgotplt->output_offset |
| 2301 | - htab->splt->output_section->vma - 6)/2, |
| 2302 | htab->splt->contents + 8); |
| 2303 | } |
| 2304 | elf_section_data (htab->splt->output_section) |
| 2305 | ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; |
| 2306 | } |
| 2307 | |
| 2308 | if (htab->sgotplt) |
| 2309 | { |
| 2310 | /* Fill in the first three entries in the global offset table. */ |
| 2311 | if (htab->sgotplt->_raw_size > 0) |
| 2312 | { |
| 2313 | bfd_put_64 (output_bfd, |
| 2314 | (sdyn == NULL ? (bfd_vma) 0 |
| 2315 | : sdyn->output_section->vma + sdyn->output_offset), |
| 2316 | htab->sgotplt->contents); |
| 2317 | /* One entry for shared object struct ptr. */ |
| 2318 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); |
| 2319 | /* One entry for _dl_runtime_resolve. */ |
| 2320 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); |
| 2321 | } |
| 2322 | |
| 2323 | elf_section_data (htab->sgot->output_section) |
| 2324 | ->this_hdr.sh_entsize = 8; |
| 2325 | } |
| 2326 | return true; |
| 2327 | } |
| 2328 | |
| 2329 | static boolean |
| 2330 | elf_s390_object_p (abfd) |
| 2331 | bfd *abfd; |
| 2332 | { |
| 2333 | return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); |
| 2334 | } |
| 2335 | |
| 2336 | /* |
| 2337 | * Why was the hash table entry size definition changed from |
| 2338 | * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and |
| 2339 | * this is the only reason for the s390_elf64_size_info structure. |
| 2340 | */ |
| 2341 | |
| 2342 | const struct elf_size_info s390_elf64_size_info = |
| 2343 | { |
| 2344 | sizeof (Elf64_External_Ehdr), |
| 2345 | sizeof (Elf64_External_Phdr), |
| 2346 | sizeof (Elf64_External_Shdr), |
| 2347 | sizeof (Elf64_External_Rel), |
| 2348 | sizeof (Elf64_External_Rela), |
| 2349 | sizeof (Elf64_External_Sym), |
| 2350 | sizeof (Elf64_External_Dyn), |
| 2351 | sizeof (Elf_External_Note), |
| 2352 | 8, /* hash-table entry size */ |
| 2353 | 1, /* internal relocations per external relocations */ |
| 2354 | 64, /* arch_size */ |
| 2355 | 8, /* file_align */ |
| 2356 | ELFCLASS64, EV_CURRENT, |
| 2357 | bfd_elf64_write_out_phdrs, |
| 2358 | bfd_elf64_write_shdrs_and_ehdr, |
| 2359 | bfd_elf64_write_relocs, |
| 2360 | bfd_elf64_swap_symbol_out, |
| 2361 | bfd_elf64_slurp_reloc_table, |
| 2362 | bfd_elf64_slurp_symbol_table, |
| 2363 | bfd_elf64_swap_dyn_in, |
| 2364 | bfd_elf64_swap_dyn_out, |
| 2365 | NULL, |
| 2366 | NULL, |
| 2367 | NULL, |
| 2368 | NULL |
| 2369 | }; |
| 2370 | |
| 2371 | #define TARGET_BIG_SYM bfd_elf64_s390_vec |
| 2372 | #define TARGET_BIG_NAME "elf64-s390" |
| 2373 | #define ELF_ARCH bfd_arch_s390 |
| 2374 | #define ELF_MACHINE_CODE EM_S390 |
| 2375 | #define ELF_MACHINE_ALT1 EM_S390_OLD |
| 2376 | #define ELF_MAXPAGESIZE 0x1000 |
| 2377 | |
| 2378 | #define elf_backend_size_info s390_elf64_size_info |
| 2379 | |
| 2380 | #define elf_backend_can_gc_sections 1 |
| 2381 | #define elf_backend_can_refcount 1 |
| 2382 | #define elf_backend_want_got_plt 1 |
| 2383 | #define elf_backend_plt_readonly 1 |
| 2384 | #define elf_backend_want_plt_sym 0 |
| 2385 | #define elf_backend_got_header_size 24 |
| 2386 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 2387 | |
| 2388 | #define elf_info_to_howto elf_s390_info_to_howto |
| 2389 | |
| 2390 | #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name |
| 2391 | #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create |
| 2392 | #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup |
| 2393 | |
| 2394 | #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol |
| 2395 | #define elf_backend_check_relocs elf_s390_check_relocs |
| 2396 | #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol |
| 2397 | #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections |
| 2398 | #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections |
| 2399 | #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol |
| 2400 | #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook |
| 2401 | #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook |
| 2402 | #define elf_backend_reloc_type_class elf_s390_reloc_type_class |
| 2403 | #define elf_backend_relocate_section elf_s390_relocate_section |
| 2404 | #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections |
| 2405 | #define elf_backend_reloc_type_class elf_s390_reloc_type_class |
| 2406 | |
| 2407 | #define elf_backend_object_p elf_s390_object_p |
| 2408 | |
| 2409 | #include "elf64-target.h" |