| /* IBM S/390-specific support for 64-bit ELF |
| Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
| Contributed Martin Schwidefsky (schwidefsky@de.ibm.com). |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "bfdlink.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| |
| static reloc_howto_type *elf_s390_reloc_type_lookup |
| PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| static void elf_s390_info_to_howto |
| PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
| static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *)); |
| static struct bfd_hash_entry *elf_s390_link_hash_newfunc |
| PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| static struct bfd_link_hash_table *elf_s390_link_hash_table_create |
| PARAMS ((bfd *)); |
| static boolean elf_s390_check_relocs |
| PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| const Elf_Internal_Rela *)); |
| static boolean elf_s390_adjust_dynamic_symbol |
| PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| static boolean elf_s390_size_dynamic_sections |
| PARAMS ((bfd *, struct bfd_link_info *)); |
| static boolean elf_s390_relocate_section |
| PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| static boolean elf_s390_finish_dynamic_symbol |
| PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| Elf_Internal_Sym *)); |
| static boolean elf_s390_finish_dynamic_sections |
| PARAMS ((bfd *, struct bfd_link_info *)); |
| |
| #define USE_RELA 1 /* We want RELA relocations, not REL. */ |
| |
| #include "elf/s390.h" |
| |
| /* In case we're on a 32-bit machine, construct a 64-bit "-1" value |
| from smaller values. Start with zero, widen, *then* decrement. */ |
| #define MINUS_ONE (((bfd_vma)0) - 1) |
| |
| /* The relocation "howto" table. */ |
| static reloc_howto_type elf_howto_table[] = |
| { |
| HOWTO (R_390_NONE, /* type */ |
| 0, /* rightshift */ |
| 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 0, /* bitsize */ |
| false, /* pc_relative */ |
| 0, /* bitpos */ |
| complain_overflow_dont, /* complain_on_overflow */ |
| bfd_elf_generic_reloc, /* special_function */ |
| "R_390_NONE", /* name */ |
| false, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0, /* dst_mask */ |
| false), /* pcrel_offset */ |
| |
| HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false), |
| HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false), |
| HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false), |
| HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false), |
| HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true), |
| HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false), |
| HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false), |
| HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true), |
| HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false), |
| 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), |
| 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), |
| HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false), |
| HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false), |
| HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true), |
| HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false), |
| HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true), |
| HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true), |
| HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true), |
| HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true), |
| HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true), |
| HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true), |
| HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false), |
| HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true), |
| HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false), |
| HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true), |
| HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true), |
| }; |
| |
| /* GNU extension to record C++ vtable hierarchy. */ |
| static reloc_howto_type elf64_s390_vtinherit_howto = |
| HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false); |
| static reloc_howto_type elf64_s390_vtentry_howto = |
| 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); |
| |
| static reloc_howto_type * |
| elf_s390_reloc_type_lookup (abfd, code) |
| bfd *abfd ATTRIBUTE_UNUSED; |
| bfd_reloc_code_real_type code; |
| { |
| switch (code) { |
| case BFD_RELOC_NONE: |
| return &elf_howto_table[(int) R_390_NONE]; |
| case BFD_RELOC_8: |
| return &elf_howto_table[(int) R_390_8]; |
| case BFD_RELOC_390_12: |
| return &elf_howto_table[(int) R_390_12]; |
| case BFD_RELOC_16: |
| return &elf_howto_table[(int) R_390_16]; |
| case BFD_RELOC_32: |
| return &elf_howto_table[(int) R_390_32]; |
| case BFD_RELOC_CTOR: |
| return &elf_howto_table[(int) R_390_32]; |
| case BFD_RELOC_32_PCREL: |
| return &elf_howto_table[(int) R_390_PC32]; |
| case BFD_RELOC_390_GOT12: |
| return &elf_howto_table[(int) R_390_GOT12]; |
| case BFD_RELOC_32_GOT_PCREL: |
| return &elf_howto_table[(int) R_390_GOT32]; |
| case BFD_RELOC_390_PLT32: |
| return &elf_howto_table[(int) R_390_PLT32]; |
| case BFD_RELOC_390_COPY: |
| return &elf_howto_table[(int) R_390_COPY]; |
| case BFD_RELOC_390_GLOB_DAT: |
| return &elf_howto_table[(int) R_390_GLOB_DAT]; |
| case BFD_RELOC_390_JMP_SLOT: |
| return &elf_howto_table[(int) R_390_JMP_SLOT]; |
| case BFD_RELOC_390_RELATIVE: |
| return &elf_howto_table[(int) R_390_RELATIVE]; |
| case BFD_RELOC_32_GOTOFF: |
| return &elf_howto_table[(int) R_390_GOTOFF]; |
| case BFD_RELOC_390_GOTPC: |
| return &elf_howto_table[(int) R_390_GOTPC]; |
| case BFD_RELOC_390_GOT16: |
| return &elf_howto_table[(int) R_390_GOT16]; |
| case BFD_RELOC_16_PCREL: |
| return &elf_howto_table[(int) R_390_PC16]; |
| case BFD_RELOC_390_PC16DBL: |
| return &elf_howto_table[(int) R_390_PC16DBL]; |
| case BFD_RELOC_390_PLT16DBL: |
| return &elf_howto_table[(int) R_390_PLT16DBL]; |
| case BFD_RELOC_VTABLE_INHERIT: |
| return &elf64_s390_vtinherit_howto; |
| case BFD_RELOC_VTABLE_ENTRY: |
| return &elf64_s390_vtentry_howto; |
| case BFD_RELOC_390_PC32DBL: |
| return &elf_howto_table[(int) R_390_PC32DBL]; |
| case BFD_RELOC_390_PLT32DBL: |
| return &elf_howto_table[(int) R_390_PLT32DBL]; |
| case BFD_RELOC_390_GOTPCDBL: |
| return &elf_howto_table[(int) R_390_GOTPCDBL]; |
| case BFD_RELOC_64: |
| return &elf_howto_table[(int) R_390_64]; |
| case BFD_RELOC_64_PCREL: |
| return &elf_howto_table[(int) R_390_PC64]; |
| case BFD_RELOC_390_GOT64: |
| return &elf_howto_table[(int) R_390_GOT64]; |
| case BFD_RELOC_390_PLT64: |
| return &elf_howto_table[(int) R_390_PLT64]; |
| case BFD_RELOC_390_GOTENT: |
| return &elf_howto_table[(int) R_390_GOTENT]; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| /* We need to use ELF64_R_TYPE so we have our own copy of this function, |
| and elf64-s390.c has its own copy. */ |
| |
| static void |
| elf_s390_info_to_howto (abfd, cache_ptr, dst) |
| bfd *abfd ATTRIBUTE_UNUSED; |
| arelent *cache_ptr; |
| Elf_Internal_Rela *dst; |
| { |
| switch (ELF64_R_TYPE(dst->r_info)) |
| { |
| case R_390_GNU_VTINHERIT: |
| cache_ptr->howto = &elf64_s390_vtinherit_howto; |
| break; |
| |
| case R_390_GNU_VTENTRY: |
| cache_ptr->howto = &elf64_s390_vtentry_howto; |
| break; |
| |
| default: |
| BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max); |
| cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)]; |
| } |
| } |
| |
| static boolean |
| elf_s390_is_local_label_name (abfd, name) |
| bfd *abfd; |
| const char *name; |
| { |
| if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) |
| return true; |
| |
| return _bfd_elf_is_local_label_name (abfd, name); |
| } |
| |
| /* Functions for the 390 ELF linker. */ |
| |
| /* The name of the dynamic interpreter. This is put in the .interp |
| section. */ |
| |
| #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" |
| |
| /* The nop opcode we use. */ |
| |
| #define s390_NOP 0x07070707 |
| |
| |
| /* The size in bytes of the first entry in the procedure linkage table. */ |
| #define PLT_FIRST_ENTRY_SIZE 32 |
| /* The size in bytes of an entry in the procedure linkage table. */ |
| #define PLT_ENTRY_SIZE 32 |
| |
| #define GOT_ENTRY_SIZE 8 |
| |
| /* The first three entries in a procedure linkage table are reserved, |
| and the initial contents are unimportant (we zero them out). |
| Subsequent entries look like this. See the SVR4 ABI 386 |
| supplement to see how this works. */ |
| |
| /* For the s390, simple addr offset can only be 0 - 4096. |
| To use the full 16777216 TB address space, several instructions |
| are needed to load an address in a register and execute |
| a branch( or just saving the address) |
| |
| Furthermore, only r 0 and 1 are free to use!!! */ |
| |
| /* The first 3 words in the GOT are then reserved. |
| Word 0 is the address of the dynamic table. |
| Word 1 is a pointer to a structure describing the object |
| Word 2 is used to point to the loader entry address. |
| |
| The code for PLT entries looks like this: |
| |
| The GOT holds the address in the PLT to be executed. |
| The loader then gets: |
| 24(15) = Pointer to the structure describing the object. |
| 28(15) = Offset in symbol table |
| The loader must then find the module where the function is |
| and insert the address in the GOT. |
| |
| PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 |
| LG 1,0(1) # 6 bytes Load address from GOT in r1 |
| BCR 15,1 # 2 bytes Jump to address |
| RET1: BASR 1,0 # 2 bytes Return from GOT 1st time |
| LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 |
| BRCL 15,-x # 6 bytes Jump to start of PLT |
| .long ? # 4 bytes offset into symbol table |
| |
| Total = 32 bytes per PLT entry |
| Fixup at offset 2: relative address to GOT entry |
| Fixup at offset 22: relative branch to PLT0 |
| Fixup at offset 28: 32 bit offset into symbol table |
| |
| A 32 bit offset into the symbol table is enough. It allows for symbol |
| tables up to a size of 2 gigabyte. A single dynamic object (the main |
| program, any shared library) is limited to 4GB in size and I want to see |
| the program that manages to have a symbol table of more than 2 GB with a |
| total size of at max 4 GB. */ |
| |
| #define PLT_ENTRY_WORD0 0xc0100000 |
| #define PLT_ENTRY_WORD1 0x0000e310 |
| #define PLT_ENTRY_WORD2 0x10000004 |
| #define PLT_ENTRY_WORD3 0x07f10d10 |
| #define PLT_ENTRY_WORD4 0xe310100c |
| #define PLT_ENTRY_WORD5 0x0014c0f4 |
| #define PLT_ENTRY_WORD6 0x00000000 |
| #define PLT_ENTRY_WORD7 0x00000000 |
| |
| /* The first PLT entry pushes the offset into the symbol table |
| from R1 onto the stack at 8(15) and the loader object info |
| at 12(15), loads the loader address in R1 and jumps to it. */ |
| |
| /* The first entry in the PLT: |
| |
| PLT0: |
| STG 1,56(15) # r1 contains the offset into the symbol table |
| LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table |
| MVC 48(8,15),8(1) # move loader ino (object struct address) to stack |
| LG 1,16(1) # get entry address of loader |
| BCR 15,1 # jump to loader |
| |
| Fixup at offset 8: relative address to start of GOT. */ |
| |
| #define PLT_FIRST_ENTRY_WORD0 0xe310f038 |
| #define PLT_FIRST_ENTRY_WORD1 0x0024c010 |
| #define PLT_FIRST_ENTRY_WORD2 0x00000000 |
| #define PLT_FIRST_ENTRY_WORD3 0xd207f030 |
| #define PLT_FIRST_ENTRY_WORD4 0x1008e310 |
| #define PLT_FIRST_ENTRY_WORD5 0x10100004 |
| #define PLT_FIRST_ENTRY_WORD6 0x07f10700 |
| #define PLT_FIRST_ENTRY_WORD7 0x07000700 |
| |
| /* The s390 linker needs to keep track of the number of relocs that it |
| decides to copy in check_relocs for each symbol. This is so that |
| it can discard PC relative relocs if it doesn't need them when |
| linking with -Bsymbolic. We store the information in a field |
| extending the regular ELF linker hash table. */ |
| |
| /* This structure keeps track of the number of PC relative relocs we |
| have copied for a given symbol. */ |
| |
| struct elf_s390_pcrel_relocs_copied |
| { |
| /* Next section. */ |
| struct elf_s390_pcrel_relocs_copied *next; |
| /* A section in dynobj. */ |
| asection *section; |
| /* Number of relocs copied in this section. */ |
| bfd_size_type count; |
| }; |
| |
| /* s390 ELF linker hash entry. */ |
| |
| struct elf_s390_link_hash_entry |
| { |
| struct elf_link_hash_entry root; |
| |
| /* Number of PC relative relocs copied for this symbol. */ |
| struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied; |
| }; |
| |
| /* s390 ELF linker hash table. */ |
| |
| struct elf_s390_link_hash_table |
| { |
| struct elf_link_hash_table root; |
| }; |
| |
| /* Declare this now that the above structures are defined. */ |
| |
| static boolean elf_s390_discard_copies |
| PARAMS ((struct elf_s390_link_hash_entry *, PTR)); |
| |
| /* Traverse an s390 ELF linker hash table. */ |
| |
| #define elf_s390_link_hash_traverse(table, func, info) \ |
| (elf_link_hash_traverse \ |
| (&(table)->root, \ |
| (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ |
| (info))) |
| |
| /* Get the s390 ELF linker hash table from a link_info structure. */ |
| |
| #define elf_s390_hash_table(p) \ |
| ((struct elf_s390_link_hash_table *) ((p)->hash)) |
| |
| /* Create an entry in an s390 ELF linker hash table. */ |
| |
| static struct bfd_hash_entry * |
| elf_s390_link_hash_newfunc (entry, table, string) |
| struct bfd_hash_entry *entry; |
| struct bfd_hash_table *table; |
| const char *string; |
| { |
| struct elf_s390_link_hash_entry *ret = |
| (struct elf_s390_link_hash_entry *) entry; |
| |
| /* Allocate the structure if it has not already been allocated by a |
| subclass. */ |
| if (ret == (struct elf_s390_link_hash_entry *) NULL) |
| ret = ((struct elf_s390_link_hash_entry *) |
| bfd_hash_allocate (table, |
| sizeof (struct elf_s390_link_hash_entry))); |
| if (ret == (struct elf_s390_link_hash_entry *) NULL) |
| return (struct bfd_hash_entry *) ret; |
| |
| /* Call the allocation method of the superclass. */ |
| ret = ((struct elf_s390_link_hash_entry *) |
| _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| table, string)); |
| if (ret != (struct elf_s390_link_hash_entry *) NULL) |
| { |
| ret->pcrel_relocs_copied = NULL; |
| } |
| |
| return (struct bfd_hash_entry *) ret; |
| } |
| |
| /* Create an s390 ELF linker hash table. */ |
| |
| static struct bfd_link_hash_table * |
| elf_s390_link_hash_table_create (abfd) |
| bfd *abfd; |
| { |
| struct elf_s390_link_hash_table *ret; |
| |
| ret = ((struct elf_s390_link_hash_table *) |
| bfd_alloc (abfd, sizeof (struct elf_s390_link_hash_table))); |
| if (ret == (struct elf_s390_link_hash_table *) NULL) |
| return NULL; |
| |
| if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, |
| elf_s390_link_hash_newfunc)) |
| { |
| bfd_release (abfd, ret); |
| return NULL; |
| } |
| |
| return &ret->root.root; |
| } |
| |
| |
| /* Look through the relocs for a section during the first phase, and |
| allocate space in the global offset table or procedure linkage |
| table. */ |
| |
| static boolean |
| elf_s390_check_relocs (abfd, info, sec, relocs) |
| bfd *abfd; |
| struct bfd_link_info *info; |
| asection *sec; |
| const Elf_Internal_Rela *relocs; |
| { |
| bfd *dynobj; |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| bfd_signed_vma *local_got_refcounts; |
| const Elf_Internal_Rela *rel; |
| const Elf_Internal_Rela *rel_end; |
| asection *sgot; |
| asection *srelgot; |
| asection *sreloc; |
| |
| if (info->relocateable) |
| return true; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| local_got_refcounts = elf_local_got_offsets (abfd); |
| |
| sgot = NULL; |
| srelgot = NULL; |
| sreloc = NULL; |
| |
| rel_end = relocs + sec->reloc_count; |
| for (rel = relocs; rel < rel_end; rel++) |
| { |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| |
| if (r_symndx < symtab_hdr->sh_info) |
| h = NULL; |
| else |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| |
| /* Some relocs require a global offset table. */ |
| if (dynobj == NULL) |
| { |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_390_GOT12: |
| case R_390_GOT16: |
| case R_390_GOT32: |
| case R_390_GOT64: |
| case R_390_GOTOFF: |
| case R_390_GOTPC: |
| case R_390_GOTPCDBL: |
| case R_390_GOTENT: |
| elf_hash_table (info)->dynobj = dynobj = abfd; |
| if (! _bfd_elf_create_got_section (dynobj, info)) |
| return false; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_390_GOT12: |
| case R_390_GOT16: |
| case R_390_GOT32: |
| case R_390_GOT64: |
| case R_390_GOTENT: |
| /* This symbol requires a global offset table entry. */ |
| |
| if (sgot == NULL) |
| { |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| BFD_ASSERT (sgot != NULL); |
| } |
| |
| |
| if (srelgot == NULL |
| && (h != NULL || info->shared)) |
| { |
| srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| if (srelgot == NULL) |
| { |
| srelgot = bfd_make_section (dynobj, ".rela.got"); |
| if (srelgot == NULL |
| || ! bfd_set_section_flags (dynobj, srelgot, |
| (SEC_ALLOC |
| | SEC_LOAD |
| | SEC_HAS_CONTENTS |
| | SEC_IN_MEMORY |
| | SEC_LINKER_CREATED |
| | SEC_READONLY)) |
| || ! bfd_set_section_alignment (dynobj, srelgot, 2)) |
| return false; |
| } |
| } |
| |
| if (h != NULL) |
| { |
| if (h->got.refcount == -1) |
| { |
| h->got.refcount = 1; |
| |
| /* Make sure this symbol is output as a dynamic symbol. */ |
| if (h->dynindx == -1) |
| { |
| if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| return false; |
| } |
| |
| sgot->_raw_size += 8; |
| srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| } |
| else |
| h->got.refcount += 1; |
| } |
| else |
| { |
| /* This is a global offset table entry for a local symbol. */ |
| if (local_got_refcounts == NULL) |
| { |
| size_t size; |
| |
| size = symtab_hdr->sh_info * sizeof (bfd_vma); |
| local_got_refcounts = (bfd_signed_vma *) |
| bfd_alloc (abfd, size); |
| if (local_got_refcounts == NULL) |
| return false; |
| elf_local_got_refcounts (abfd) = local_got_refcounts; |
| memset (local_got_refcounts, -1, size); |
| } |
| if (local_got_refcounts[r_symndx] == -1) |
| { |
| local_got_refcounts[r_symndx] = 1; |
| |
| sgot->_raw_size += 8; |
| if (info->shared) |
| { |
| /* If we are generating a shared object, we need to |
| output a R_390_RELATIVE reloc so that the dynamic |
| linker can adjust this GOT entry. */ |
| srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| } |
| } |
| else |
| local_got_refcounts[r_symndx] += 1; |
| |
| } |
| break; |
| |
| case R_390_PLT16DBL: |
| case R_390_PLT32: |
| case R_390_PLT32DBL: |
| case R_390_PLT64: |
| /* This symbol requires a procedure linkage table entry. We |
| actually build the entry in adjust_dynamic_symbol, |
| because this might be a case of linking PIC code which is |
| never referenced by a dynamic object, in which case we |
| don't need to generate a procedure linkage table entry |
| after all. */ |
| |
| /* If this is a local symbol, we resolve it directly without |
| creating a procedure linkage table entry. */ |
| if (h == NULL) |
| continue; |
| |
| if (h->plt.refcount == -1) |
| { |
| h->plt.refcount = 1; |
| h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| } |
| else |
| h->plt.refcount += 1; |
| break; |
| |
| case R_390_8: |
| case R_390_16: |
| case R_390_32: |
| case R_390_64: |
| case R_390_PC16: |
| case R_390_PC16DBL: |
| case R_390_PC32: |
| case R_390_PC32DBL: |
| case R_390_PC64: |
| if (h != NULL) |
| h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| |
| /* If we are creating a shared library, and this is a reloc |
| against a global symbol, or a non PC relative reloc |
| against a local symbol, then we need to copy the reloc |
| into the shared library. However, if we are linking with |
| -Bsymbolic, we do not need to copy a reloc against a |
| global symbol which is defined in an object we are |
| including in the link (i.e., DEF_REGULAR is set). At |
| this point we have not seen all the input files, so it is |
| possible that DEF_REGULAR is not set now but will be set |
| later (it is never cleared). We account for that |
| possibility below by storing information in the |
| pcrel_relocs_copied field of the hash table entry. */ |
| if (info->shared |
| && (sec->flags & SEC_ALLOC) != 0 |
| && (ELF64_R_TYPE (rel->r_info) == R_390_8 |
| || ELF64_R_TYPE (rel->r_info) == R_390_16 |
| || ELF64_R_TYPE (rel->r_info) == R_390_32 |
| || ELF64_R_TYPE (rel->r_info) == R_390_64 |
| || (h != NULL |
| && h->dynindx != -1 |
| && (! info->symbolic |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| { |
| /* When creating a shared object, we must copy these |
| reloc types into the output file. We create a reloc |
| section in dynobj and make room for this reloc. */ |
| if (sreloc == NULL) |
| { |
| const char *name; |
| |
| name = (bfd_elf_string_from_elf_section |
| (abfd, |
| elf_elfheader (abfd)->e_shstrndx, |
| elf_section_data (sec)->rel_hdr.sh_name)); |
| if (name == NULL) |
| return false; |
| |
| BFD_ASSERT (strncmp (name, ".rela", 5) == 0 |
| && strcmp (bfd_get_section_name (abfd, sec), |
| name + 5) == 0); |
| |
| sreloc = bfd_get_section_by_name (dynobj, name); |
| if (sreloc == NULL) |
| { |
| flagword flags; |
| |
| sreloc = bfd_make_section (dynobj, name); |
| flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| if ((sec->flags & SEC_ALLOC) != 0) |
| flags |= SEC_ALLOC | SEC_LOAD; |
| if (sreloc == NULL |
| || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| return false; |
| } |
| } |
| |
| sreloc->_raw_size += sizeof (Elf64_External_Rela); |
| |
| /* If we are linking with -Bsymbolic, and this is a |
| global symbol, we count the number of PC relative |
| relocations we have entered for this symbol, so that |
| we can discard them again if the symbol is later |
| defined by a regular object. Note that this function |
| is only called if we are using an elf64_s390 linker |
| hash table, which means that h is really a pointer to |
| an elf64_s390_link_hash_entry. */ |
| if (h != NULL |
| && (ELF64_R_TYPE (rel->r_info) == R_390_PC16 || |
| ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL || |
| ELF64_R_TYPE (rel->r_info) == R_390_PC32 || |
| ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL || |
| ELF64_R_TYPE (rel->r_info) == R_390_PC64)) |
| { |
| struct elf_s390_link_hash_entry *eh; |
| struct elf_s390_pcrel_relocs_copied *p; |
| |
| eh = (struct elf_s390_link_hash_entry *) h; |
| |
| for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) |
| if (p->section == sreloc) |
| break; |
| |
| if (p == NULL) |
| { |
| p = ((struct elf_s390_pcrel_relocs_copied *) |
| bfd_alloc (dynobj, sizeof *p)); |
| if (p == NULL) |
| return false; |
| p->next = eh->pcrel_relocs_copied; |
| eh->pcrel_relocs_copied = p; |
| p->section = sreloc; |
| p->count = 0; |
| } |
| |
| ++p->count; |
| } |
| } |
| |
| break; |
| |
| /* This relocation describes the C++ object vtable hierarchy. |
| Reconstruct it for later use during GC. */ |
| case R_390_GNU_VTINHERIT: |
| if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| return false; |
| break; |
| |
| /* This relocation describes which C++ vtable entries are actually |
| used. Record for later use during GC. */ |
| case R_390_GNU_VTENTRY: |
| if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| return false; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| return true; |
| } |
| |
| /* Return the section that should be marked against GC for a given |
| relocation. */ |
| |
| static asection * |
| elf_s390_gc_mark_hook (abfd, info, rel, h, sym) |
| bfd *abfd; |
| struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| Elf_Internal_Rela *rel; |
| struct elf_link_hash_entry *h; |
| Elf_Internal_Sym *sym; |
| { |
| if (h != NULL) |
| { |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_390_GNU_VTINHERIT: |
| case R_390_GNU_VTENTRY: |
| break; |
| |
| default: |
| switch (h->root.type) |
| { |
| case bfd_link_hash_defined: |
| case bfd_link_hash_defweak: |
| return h->root.u.def.section; |
| |
| case bfd_link_hash_common: |
| return h->root.u.c.p->section; |
| |
| default: |
| break; |
| } |
| } |
| } |
| else |
| { |
| if (!(elf_bad_symtab (abfd) |
| && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| && sym->st_shndx != SHN_COMMON)) |
| { |
| return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* Update the got entry reference counts for the section being removed. */ |
| |
| static boolean |
| elf_s390_gc_sweep_hook (abfd, info, sec, relocs) |
| bfd *abfd ATTRIBUTE_UNUSED; |
| struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| asection *sec ATTRIBUTE_UNUSED; |
| const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| bfd_signed_vma *local_got_refcounts; |
| const Elf_Internal_Rela *rel, *relend; |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| bfd *dynobj; |
| asection *sgot; |
| asection *srelgot; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| local_got_refcounts = elf_local_got_refcounts (abfd); |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| if (dynobj == NULL) |
| return true; |
| |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| |
| relend = relocs + sec->reloc_count; |
| for (rel = relocs; rel < relend; rel++) |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_390_GOT12: |
| case R_390_GOT16: |
| case R_390_GOT32: |
| case R_390_GOT64: |
| case R_390_GOTOFF: |
| case R_390_GOTPC: |
| case R_390_GOTPCDBL: |
| case R_390_GOTENT: |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| if (r_symndx >= symtab_hdr->sh_info) |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| if (h->got.refcount > 0) |
| { |
| h->got.refcount -= 1; |
| if (h->got.refcount == 0) |
| { |
| sgot->_raw_size -= 8; |
| srelgot->_raw_size -= sizeof (Elf64_External_Rela); |
| } |
| } |
| } |
| else if (local_got_refcounts != NULL) |
| { |
| if (local_got_refcounts[r_symndx] > 0) |
| { |
| local_got_refcounts[r_symndx] -= 1; |
| if (local_got_refcounts[r_symndx] == 0) |
| { |
| sgot->_raw_size -= 8; |
| if (info->shared) |
| srelgot->_raw_size -= sizeof (Elf64_External_Rela); |
| } |
| } |
| } |
| break; |
| |
| case R_390_PLT16DBL: |
| case R_390_PLT32: |
| case R_390_PLT32DBL: |
| case R_390_PLT64: |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| if (r_symndx >= symtab_hdr->sh_info) |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| if (h->plt.refcount > 0) |
| h->plt.refcount -= 1; |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| return true; |
| } |
| |
| /* Adjust a symbol defined by a dynamic object and referenced by a |
| regular object. The current definition is in some section of the |
| dynamic object, but we're not including those sections. We have to |
| change the definition to something the rest of the link can |
| understand. */ |
| |
| static boolean |
| elf_s390_adjust_dynamic_symbol (info, h) |
| struct bfd_link_info *info; |
| struct elf_link_hash_entry *h; |
| { |
| bfd *dynobj; |
| asection *s; |
| unsigned int power_of_two; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| |
| /* Make sure we know what is going on here. */ |
| BFD_ASSERT (dynobj != NULL |
| && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| || h->weakdef != NULL |
| || ((h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_REF_REGULAR) != 0 |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| |
| /* If this is a function, put it in the procedure linkage table. We |
| will fill in the contents of the procedure linkage table later |
| (although we could actually do it here). */ |
| if (h->type == STT_FUNC |
| || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| { |
| if ((! info->shared |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) |
| || (info->shared && h->plt.refcount <= 0)) |
| { |
| /* This case can occur if we saw a PLT32 reloc in an input |
| file, but the symbol was never referred to by a dynamic |
| object. In such a case, we don't actually need to build |
| a procedure linkage table, and we can just do a PC32 |
| reloc instead. */ |
| h->plt.offset = (bfd_vma) -1; |
| h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| return true; |
| } |
| |
| /* Make sure this symbol is output as a dynamic symbol. */ |
| if (h->dynindx == -1) |
| { |
| if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| return false; |
| } |
| |
| s = bfd_get_section_by_name (dynobj, ".plt"); |
| BFD_ASSERT (s != NULL); |
| |
| |
| /* The first entry in .plt is reserved. */ |
| if (s->_raw_size == 0) |
| s->_raw_size = PLT_FIRST_ENTRY_SIZE; |
| |
| /* If this symbol is not defined in a regular file, and we are |
| not generating a shared library, then set the symbol to this |
| location in the .plt. This is required to make function |
| pointers compare as equal between the normal executable and |
| the shared library. */ |
| if (! info->shared |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| { |
| h->root.u.def.section = s; |
| h->root.u.def.value = s->_raw_size; |
| } |
| |
| h->plt.offset = s->_raw_size; |
| |
| /* Make room for this entry. */ |
| s->_raw_size += PLT_ENTRY_SIZE; |
| |
| /* We also need to make an entry in the .got.plt section, which |
| will be placed in the .got section by the linker script. */ |
| s = bfd_get_section_by_name (dynobj, ".got.plt"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_size += GOT_ENTRY_SIZE; |
| |
| /* We also need to make an entry in the .rela.plt section. */ |
| s = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_size += sizeof (Elf64_External_Rela); |
| |
| return true; |
| } |
| |
| /* If this is a weak symbol, and there is a real definition, the |
| processor independent code will have arranged for us to see the |
| real definition first, and we can just use the same value. */ |
| if (h->weakdef != NULL) |
| { |
| BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| || h->weakdef->root.type == bfd_link_hash_defweak); |
| h->root.u.def.section = h->weakdef->root.u.def.section; |
| h->root.u.def.value = h->weakdef->root.u.def.value; |
| return true; |
| } |
| |
| /* This is a reference to a symbol defined by a dynamic object which |
| is not a function. */ |
| |
| /* If we are creating a shared library, we must presume that the |
| only references to the symbol are via the global offset table. |
| For such cases we need not do anything here; the relocations will |
| be handled correctly by relocate_section. */ |
| if (info->shared) |
| return true; |
| |
| /* If there are no references to this symbol that do not use the |
| GOT, we don't need to generate a copy reloc. */ |
| if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| return true; |
| |
| /* We must allocate the symbol in our .dynbss section, which will |
| become part of the .bss section of the executable. There will be |
| an entry for this symbol in the .dynsym section. The dynamic |
| object will contain position independent code, so all references |
| from the dynamic object to this symbol will go through the global |
| offset table. The dynamic linker will use the .dynsym entry to |
| determine the address it must put in the global offset table, so |
| both the dynamic object and the regular object will refer to the |
| same memory location for the variable. */ |
| |
| s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| BFD_ASSERT (s != NULL); |
| |
| /* We must generate a R_390_COPY reloc to tell the dynamic linker |
| to copy the initial value out of the dynamic object and into the |
| runtime process image. We need to remember the offset into the |
| .rel.bss section we are going to use. */ |
| if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| { |
| asection *srel; |
| |
| srel = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| BFD_ASSERT (srel != NULL); |
| srel->_raw_size += sizeof (Elf64_External_Rela); |
| h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| } |
| |
| /* We need to figure out the alignment required for this symbol. I |
| have no idea how ELF linkers handle this. */ |
| power_of_two = bfd_log2 (h->size); |
| if (power_of_two > 3) |
| power_of_two = 3; |
| |
| /* Apply the required alignment. */ |
| s->_raw_size = BFD_ALIGN (s->_raw_size, |
| (bfd_size_type) (1 << power_of_two)); |
| if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| { |
| if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| return false; |
| } |
| |
| /* Define the symbol as being at this point in the section. */ |
| h->root.u.def.section = s; |
| h->root.u.def.value = s->_raw_size; |
| |
| /* Increment the section size to make room for the symbol. */ |
| s->_raw_size += h->size; |
| |
| return true; |
| } |
| |
| /* Set the sizes of the dynamic sections. */ |
| |
| static boolean |
| elf_s390_size_dynamic_sections (output_bfd, info) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| { |
| bfd *dynobj; |
| asection *s; |
| boolean reltext; |
| boolean relocs; |
| boolean plt; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| BFD_ASSERT (dynobj != NULL); |
| |
| if (elf_hash_table (info)->dynamic_sections_created) |
| { |
| /* Set the contents of the .interp section to the interpreter. */ |
| if (! info->shared) |
| { |
| s = bfd_get_section_by_name (dynobj, ".interp"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| } |
| } |
| else |
| { |
| /* We may have created entries in the .rela.got section. |
| However, if we are not creating the dynamic sections, we will |
| not actually use these entries. Reset the size of .rela.got, |
| which will cause it to get stripped from the output file |
| below. */ |
| s = bfd_get_section_by_name (dynobj, ".rela.got"); |
| if (s != NULL) |
| s->_raw_size = 0; |
| } |
| |
| /* If this is a -Bsymbolic shared link, then we need to discard all |
| PC relative relocs against symbols defined in a regular object. |
| We allocated space for them in the check_relocs routine, but we |
| will not fill them in in the relocate_section routine. */ |
| if (info->shared) |
| elf_s390_link_hash_traverse (elf_s390_hash_table (info), |
| elf_s390_discard_copies, |
| (PTR) info); |
| |
| /* The check_relocs and adjust_dynamic_symbol entry points have |
| determined the sizes of the various dynamic sections. Allocate |
| memory for them. */ |
| plt = false; |
| reltext = false; |
| relocs = false; |
| for (s = dynobj->sections; s != NULL; s = s->next) |
| { |
| const char *name; |
| boolean strip; |
| |
| if ((s->flags & SEC_LINKER_CREATED) == 0) |
| continue; |
| |
| /* It's OK to base decisions on the section name, because none |
| of the dynobj section names depend upon the input files. */ |
| name = bfd_get_section_name (dynobj, s); |
| |
| strip = false; |
| |
| if (strcmp (name, ".plt") == 0) |
| { |
| if (s->_raw_size == 0) |
| { |
| /* Strip this section if we don't need it; see the |
| comment below. */ |
| strip = true; |
| } |
| else |
| { |
| /* Remember whether there is a PLT. */ |
| plt = true; |
| } |
| } |
| else if (strncmp (name, ".rela", 5) == 0) |
| { |
| if (s->_raw_size == 0) |
| { |
| /* If we don't need this section, strip it from the |
| output file. This is to handle .rela.bss and |
| .rel.plt. We must create it in |
| create_dynamic_sections, because it must be created |
| before the linker maps input sections to output |
| sections. The linker does that before |
| adjust_dynamic_symbol is called, and it is that |
| function which decides whether anything needs to go |
| into these sections. */ |
| strip = true; |
| } |
| else |
| { |
| asection *target; |
| |
| /* Remember whether there are any reloc sections other |
| than .rela.plt. */ |
| if (strcmp (name, ".rela.plt") != 0) |
| { |
| const char *outname; |
| |
| relocs = true; |
| |
| /* If this relocation section applies to a read only |
| section, then we probably need a DT_TEXTREL |
| entry. The entries in the .rela.plt section |
| really apply to the .got section, which we |
| created ourselves and so know is not readonly. */ |
| outname = bfd_get_section_name (output_bfd, |
| s->output_section); |
| target = bfd_get_section_by_name (output_bfd, outname + 5); |
| if (target != NULL |
| && (target->flags & SEC_READONLY) != 0 |
| && (target->flags & SEC_ALLOC) != 0) |
| reltext = true; |
| } |
| |
| /* We use the reloc_count field as a counter if we need |
| to copy relocs into the output file. */ |
| s->reloc_count = 0; |
| } |
| } |
| else if (strncmp (name, ".got", 4) != 0) |
| { |
| /* It's not one of our sections, so don't allocate space. */ |
| continue; |
| } |
| |
| if (strip) |
| { |
| _bfd_strip_section_from_output (info, s); |
| continue; |
| } |
| |
| /* Allocate memory for the section contents. */ |
| s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); |
| if (s->contents == NULL && s->_raw_size != 0) |
| return false; |
| } |
| |
| if (elf_hash_table (info)->dynamic_sections_created) |
| { |
| /* Add some entries to the .dynamic section. We fill in the |
| values later, in elf_s390_finish_dynamic_sections, but we |
| must add the entries now so that we get the correct size for |
| the .dynamic section. The DT_DEBUG entry is filled in by the |
| dynamic linker and used by the debugger. */ |
| if (! info->shared) |
| { |
| if (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0)) |
| return false; |
| } |
| |
| if (plt) |
| { |
| if (! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0) |
| || ! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
| || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_RELA) |
| || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0)) |
| return false; |
| } |
| |
| if (relocs) |
| { |
| if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0) |
| || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0) |
| || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT, |
| sizeof (Elf64_External_Rela))) |
| return false; |
| } |
| |
| if (reltext) |
| { |
| if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0)) |
| return false; |
| info->flags |= DF_TEXTREL; |
| } |
| } |
| |
| return true; |
| } |
| |
| /* This function is called via elf64_s390_link_hash_traverse if we are |
| creating a shared object with -Bsymbolic. It discards the space |
| allocated to copy PC relative relocs against symbols which are |
| defined in regular objects. We allocated space for them in the |
| check_relocs routine, but we won't fill them in in the |
| relocate_section routine. */ |
| |
| /*ARGSUSED*/ |
| static boolean |
| elf_s390_discard_copies (h, inf) |
| struct elf_s390_link_hash_entry *h; |
| PTR inf; |
| { |
| struct elf_s390_pcrel_relocs_copied *s; |
| struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| |
| /* If a symbol has been forced local or we have found a regular |
| definition for the symbolic link case, then we won't be needing |
| any relocs. */ |
| if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
| && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 |
| || info->symbolic)) |
| { |
| for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) |
| s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela); |
| } |
| |
| return true; |
| } |
| /* Relocate a 390 ELF section. */ |
| |
| static boolean |
| elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, |
| contents, relocs, local_syms, local_sections) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| bfd *input_bfd; |
| asection *input_section; |
| bfd_byte *contents; |
| Elf_Internal_Rela *relocs; |
| Elf_Internal_Sym *local_syms; |
| asection **local_sections; |
| { |
| bfd *dynobj; |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| bfd_vma *local_got_offsets; |
| asection *sgot; |
| asection *splt; |
| asection *sreloc; |
| Elf_Internal_Rela *rel; |
| Elf_Internal_Rela *relend; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (input_bfd); |
| local_got_offsets = elf_local_got_offsets (input_bfd); |
| |
| sgot = NULL; |
| splt = NULL; |
| sreloc = NULL; |
| if (dynobj != NULL) |
| { |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| } |
| |
| rel = relocs; |
| relend = relocs + input_section->reloc_count; |
| for (; rel < relend; rel++) |
| { |
| int r_type; |
| reloc_howto_type *howto; |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| Elf_Internal_Sym *sym; |
| asection *sec; |
| bfd_vma relocation; |
| bfd_reloc_status_type r; |
| |
| r_type = ELF64_R_TYPE (rel->r_info); |
| if (r_type == R_390_GNU_VTINHERIT |
| || r_type == R_390_GNU_VTENTRY) |
| continue; |
| if (r_type < 0 || r_type >= (int) R_390_max) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| howto = elf_howto_table + r_type; |
| |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| |
| if (info->relocateable) |
| { |
| /* This is a relocateable link. We don't have to change |
| anything, unless the reloc is against a section symbol, |
| in which case we have to adjust according to where the |
| section symbol winds up in the output section. */ |
| if (r_symndx < symtab_hdr->sh_info) |
| { |
| sym = local_syms + r_symndx; |
| if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| { |
| sec = local_sections[r_symndx]; |
| rel->r_addend += sec->output_offset + sym->st_value; |
| } |
| } |
| |
| continue; |
| } |
| |
| /* This is a final link. */ |
| h = NULL; |
| sym = NULL; |
| sec = NULL; |
| if (r_symndx < symtab_hdr->sh_info) |
| { |
| sym = local_syms + r_symndx; |
| sec = local_sections[r_symndx]; |
| relocation = (sec->output_section->vma |
| + sec->output_offset |
| + sym->st_value); |
| } |
| else |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| while (h->root.type == bfd_link_hash_indirect |
| || h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| if (h->root.type == bfd_link_hash_defined |
| || h->root.type == bfd_link_hash_defweak) |
| { |
| sec = h->root.u.def.section; |
| if ((r_type == R_390_GOTPC |
| || r_type == R_390_GOTPCDBL) |
| || ((r_type == R_390_PLT16DBL || |
| r_type == R_390_PLT32 || |
| r_type == R_390_PLT32DBL || |
| r_type == R_390_PLT64) |
| && splt != NULL |
| && h->plt.offset != (bfd_vma) -1) |
| || ((r_type == R_390_GOT12 || |
| r_type == R_390_GOT16 || |
| r_type == R_390_GOT32 || |
| r_type == R_390_GOT64 || |
| r_type == R_390_GOTENT) |
| && elf_hash_table (info)->dynamic_sections_created |
| && (! info->shared |
| || (! info->symbolic && h->dynindx != -1) |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| || (info->shared |
| && ((! info->symbolic && h->dynindx != -1) |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| && ( r_type == R_390_8 || |
| r_type == R_390_16 || |
| r_type == R_390_32 || |
| r_type == R_390_64 || |
| r_type == R_390_PC16 || |
| r_type == R_390_PC16DBL || |
| r_type == R_390_PC32 || |
| r_type == R_390_PC32DBL || |
| r_type == R_390_PC64) |
| && ((input_section->flags & SEC_ALLOC) != 0 |
| /* DWARF will emit R_386_32 relocations in its |
| sections against symbols defined externally |
| in shared libraries. We can't do anything |
| with them here. */ |
| || ((input_section->flags & SEC_DEBUGGING) != 0 |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_DYNAMIC) != 0)))) |
| { |
| /* In these cases, we don't need the relocation |
| value. We check specially because in some |
| obscure cases sec->output_section will be NULL. */ |
| relocation = 0; |
| } |
| else if (sec->output_section == NULL) |
| { |
| (*_bfd_error_handler) |
| (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), |
| bfd_get_filename (input_bfd), h->root.root.string, |
| bfd_get_section_name (input_bfd, input_section)); |
| relocation = 0; |
| } |
| else |
| relocation = (h->root.u.def.value |
| + sec->output_section->vma |
| + sec->output_offset); |
| } |
| else if (h->root.type == bfd_link_hash_undefweak) |
| relocation = 0; |
| else if (info->shared && !info->symbolic |
| && !info->no_undefined |
| && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| relocation = 0; |
| else |
| { |
| if (! ((*info->callbacks->undefined_symbol) |
| (info, h->root.root.string, input_bfd, |
| input_section, rel->r_offset, |
| (!info->shared || info->no_undefined |
| || ELF_ST_VISIBILITY (h->other))))) |
| return false; |
| relocation = 0; |
| } |
| } |
| |
| switch (r_type) |
| { |
| case R_390_GOT12: |
| case R_390_GOT16: |
| case R_390_GOT32: |
| case R_390_GOT64: |
| case R_390_GOTENT: |
| /* Relocation is to the entry for this symbol in the global |
| offset table. */ |
| BFD_ASSERT (sgot != NULL); |
| |
| if (h != NULL) |
| { |
| bfd_vma off; |
| |
| off = h->got.offset; |
| BFD_ASSERT (off != (bfd_vma) -1); |
| |
| if (! elf_hash_table (info)->dynamic_sections_created |
| || (info->shared |
| && (info->symbolic || h->dynindx == -1) |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| { |
| /* This is actually a static link, or it is a |
| -Bsymbolic link and the symbol is defined |
| locally, or the symbol was forced to be local |
| because of a version file. We must initialize |
| this entry in the global offset table. Since the |
| offset must always be a multiple of 2, we use the |
| least significant bit to record whether we have |
| initialized it already. |
| |
| When doing a dynamic link, we create a .rel.got |
| relocation entry to initialize the value. This |
| is done in the finish_dynamic_symbol routine. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_64 (output_bfd, relocation, |
| sgot->contents + off); |
| h->got.offset |= 1; |
| } |
| } |
| relocation = sgot->output_offset + off; |
| } |
| else |
| { |
| bfd_vma off; |
| |
| BFD_ASSERT (local_got_offsets != NULL |
| && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| |
| off = local_got_offsets[r_symndx]; |
| |
| /* The offset must always be a multiple of 8. We use |
| the least significant bit to record whether we have |
| already generated the necessary reloc. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_64 (output_bfd, relocation, sgot->contents + off); |
| |
| if (info->shared) |
| { |
| asection *srelgot; |
| Elf_Internal_Rela outrel; |
| |
| srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| BFD_ASSERT (srelgot != NULL); |
| |
| outrel.r_offset = (sgot->output_section->vma |
| + sgot->output_offset |
| + off); |
| outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| outrel.r_addend = relocation; |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, |
| (((Elf64_External_Rela *) |
| srelgot->contents) |
| + srelgot->reloc_count)); |
| ++srelgot->reloc_count; |
| } |
| |
| local_got_offsets[r_symndx] |= 1; |
| } |
| |
| relocation = sgot->output_offset + off; |
| } |
| |
| /* |
| * For @GOTENT the relocation is against the offset between |
| * the instruction and the symbols entry in the GOT and not |
| * between the start of the GOT and the symbols entry. We |
| * add the vma of the GOT to get the correct value. |
| */ |
| if (r_type == R_390_GOTENT) |
| relocation += sgot->output_section->vma; |
| |
| break; |
| |
| case R_390_GOTOFF: |
| /* Relocation is relative to the start of the global offset |
| table. */ |
| |
| if (sgot == NULL) |
| { |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| BFD_ASSERT (sgot != NULL); |
| } |
| |
| /* Note that sgot->output_offset is not involved in this |
| calculation. We always want the start of .got. If we |
| defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| permitted by the ABI, we might have to change this |
| calculation. */ |
| relocation -= sgot->output_section->vma; |
| |
| break; |
| |
| case R_390_GOTPC: |
| case R_390_GOTPCDBL: |
| /* Use global offset table as symbol value. */ |
| |
| if (sgot == NULL) |
| { |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| BFD_ASSERT (sgot != NULL); |
| } |
| |
| relocation = sgot->output_section->vma; |
| |
| break; |
| |
| case R_390_PLT16DBL: |
| case R_390_PLT32: |
| case R_390_PLT32DBL: |
| case R_390_PLT64: |
| /* Relocation is to the entry for this symbol in the |
| procedure linkage table. */ |
| |
| /* Resolve a PLT32 reloc against a local symbol directly, |
| without using the procedure linkage table. */ |
| if (h == NULL) |
| break; |
| |
| if (h->plt.offset == (bfd_vma) -1 || splt == NULL) |
| { |
| /* We didn't make a PLT entry for this symbol. This |
| happens when statically linking PIC code, or when |
| using -Bsymbolic. */ |
| break; |
| } |
| |
| relocation = (splt->output_section->vma |
| + splt->output_offset |
| + h->plt.offset); |
| |
| break; |
| |
| case R_390_8: |
| case R_390_16: |
| case R_390_32: |
| case R_390_64: |
| case R_390_PC16: |
| case R_390_PC16DBL: |
| case R_390_PC32: |
| case R_390_PC32DBL: |
| case R_390_PC64: |
| if (info->shared |
| && (input_section->flags & SEC_ALLOC) != 0 |
| && (r_type == R_390_8 |
| || r_type == R_390_16 |
| || r_type == R_390_32 |
| || r_type == R_390_64 |
| || (h != NULL |
| && h->dynindx != -1 |
| && (! info->symbolic |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| { |
| Elf_Internal_Rela outrel; |
| boolean skip, relocate; |
| |
| /* When generating a shared object, these relocations |
| are copied into the output file to be resolved at run |
| time. */ |
| |
| if (sreloc == NULL) |
| { |
| const char *name; |
| |
| name = (bfd_elf_string_from_elf_section |
| (input_bfd, |
| elf_elfheader (input_bfd)->e_shstrndx, |
| elf_section_data (input_section)->rel_hdr.sh_name)); |
| if (name == NULL) |
| return false; |
| |
| BFD_ASSERT (strncmp (name, ".rela", 5) == 0 |
| && strcmp (bfd_get_section_name (input_bfd, |
| input_section), |
| name + 5) == 0); |
| |
| sreloc = bfd_get_section_by_name (dynobj, name); |
| BFD_ASSERT (sreloc != NULL); |
| } |
| |
| skip = false; |
| |
| if (elf_section_data (input_section)->stab_info == NULL) |
| outrel.r_offset = rel->r_offset; |
| else |
| { |
| bfd_vma off; |
| |
| off = (_bfd_stab_section_offset |
| (output_bfd, &elf_hash_table (info)->stab_info, |
| input_section, |
| &elf_section_data (input_section)->stab_info, |
| rel->r_offset)); |
| if (off == (bfd_vma) -1) |
| skip = true; |
| outrel.r_offset = off; |
| } |
| |
| outrel.r_offset += (input_section->output_section->vma |
| + input_section->output_offset); |
| |
| if (skip) |
| { |
| memset (&outrel, 0, sizeof outrel); |
| relocate = false; |
| } |
| else if (r_type == R_390_PC16 || |
| r_type == R_390_PC16DBL || |
| r_type == R_390_PC32 || |
| r_type == R_390_PC32DBL || |
| r_type == R_390_PC64) |
| { |
| BFD_ASSERT (h != NULL && h->dynindx != -1); |
| relocate = false; |
| outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
| outrel.r_addend = relocation + rel->r_addend; |
| } |
| else |
| { |
| /* h->dynindx may be -1 if this symbol was marked to |
| become local. */ |
| if (h == NULL |
| || ((info->symbolic || h->dynindx == -1) |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) != 0)) |
| { |
| relocate = true; |
| outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| outrel.r_addend = relocation + rel->r_addend; |
| } |
| else |
| { |
| BFD_ASSERT (h->dynindx != -1); |
| relocate = false; |
| outrel.r_info = ELF64_R_INFO (h->dynindx, R_390_64); |
| outrel.r_addend = relocation + rel->r_addend; |
| } |
| } |
| |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, |
| (((Elf64_External_Rela *) |
| sreloc->contents) |
| + sreloc->reloc_count)); |
| ++sreloc->reloc_count; |
| |
| /* If this reloc is against an external symbol, we do |
| not want to fiddle with the addend. Otherwise, we |
| need to include the symbol value so that it becomes |
| an addend for the dynamic reloc. */ |
| if (! relocate) |
| continue; |
| } |
| |
| break; |
| |
| default: |
| break; |
| } |
| |
| r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, |
| relocation, rel->r_addend); |
| |
| if (r != bfd_reloc_ok) |
| { |
| switch (r) |
| { |
| default: |
| case bfd_reloc_outofrange: |
| abort (); |
| case bfd_reloc_overflow: |
| { |
| const char *name; |
| |
| if (h != NULL) |
| name = h->root.root.string; |
| else |
| { |
| name = bfd_elf_string_from_elf_section (input_bfd, |
| symtab_hdr->sh_link, |
| sym->st_name); |
| if (name == NULL) |
| return false; |
| if (*name == '\0') |
| name = bfd_section_name (input_bfd, sec); |
| } |
| if (! ((*info->callbacks->reloc_overflow) |
| (info, name, howto->name, (bfd_vma) 0, |
| input_bfd, input_section, rel->r_offset))) |
| return false; |
| } |
| break; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| /* Finish up dynamic symbol handling. We set the contents of various |
| dynamic sections here. */ |
| |
| static boolean |
| elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| struct elf_link_hash_entry *h; |
| Elf_Internal_Sym *sym; |
| { |
| bfd *dynobj; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| |
| if (h->plt.offset != (bfd_vma) -1) |
| { |
| asection *splt; |
| asection *srela; |
| Elf_Internal_Rela rela; |
| bfd_vma got_offset; |
| bfd_vma plt_index; |
| asection *sgot; |
| |
| /* This symbol has an entry in the procedure linkage table. Set |
| it up. */ |
| |
| BFD_ASSERT (h->dynindx != -1); |
| |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| srela = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); |
| |
| /* Calc. index no. |
| Current offset - size first entry / entry size. */ |
| plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; |
| |
| /* Offset in GOT is PLT index plus GOT headers(3) times 8, |
| addr & GOT addr. */ |
| got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| |
| /* Fill in the blueprint of a PLT. */ |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD0, |
| splt->contents + h->plt.offset); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD1, |
| splt->contents + h->plt.offset + 4); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD2, |
| splt->contents + h->plt.offset + 8); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD3, |
| splt->contents + h->plt.offset + 12); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD4, |
| splt->contents + h->plt.offset + 16); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD5, |
| splt->contents + h->plt.offset + 20); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD6, |
| splt->contents + h->plt.offset + 24); |
| bfd_put_32 (output_bfd, PLT_ENTRY_WORD7, |
| splt->contents + h->plt.offset + 28); |
| /* Fixup the relative address to the GOT entry */ |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma + sgot->output_offset + got_offset |
| - (splt->output_section->vma + h->plt.offset))/2, |
| splt->contents + h->plt.offset + 2); |
| /* Fixup the relative branch to PLT 0 */ |
| bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + |
| (PLT_ENTRY_SIZE * plt_index) + 22)/2, |
| splt->contents + h->plt.offset + 24); |
| /* Fixup offset into symbol table */ |
| bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), |
| splt->contents + h->plt.offset + 28); |
| |
| /* Fill in the entry in the .rela.plt section. */ |
| rela.r_offset = (sgot->output_section->vma |
| + sgot->output_offset |
| + got_offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); |
| rela.r_addend = 0; |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, |
| ((Elf64_External_Rela *) srela->contents |
| + plt_index )); |
| |
| /* Fill in the entry in the global offset table. |
| Points to instruction after GOT offset. */ |
| bfd_put_64 (output_bfd, |
| (splt->output_section->vma |
| + splt->output_offset |
| + h->plt.offset |
| + 14), |
| sgot->contents + got_offset); |
| |
| |
| if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| { |
| /* Mark the symbol as undefined, rather than as defined in |
| the .plt section. Leave the value alone. */ |
| sym->st_shndx = SHN_UNDEF; |
| } |
| } |
| |
| if (h->got.offset != (bfd_vma) -1) |
| { |
| asection *sgot; |
| asection *srela; |
| Elf_Internal_Rela rela; |
| |
| /* This symbol has an entry in the global offset table. Set it |
| up. */ |
| |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| srela = bfd_get_section_by_name (dynobj, ".rela.got"); |
| BFD_ASSERT (sgot != NULL && srela != NULL); |
| |
| rela.r_offset = (sgot->output_section->vma |
| + sgot->output_offset |
| + (h->got.offset &~ 1)); |
| |
| /* If this is a static link, or it is a -Bsymbolic link and the |
| symbol is defined locally or was forced to be local because |
| of a version file, we just want to emit a RELATIVE reloc. |
| The entry in the global offset table will already have been |
| initialized in the relocate_section function. */ |
| if (! elf_hash_table (info)->dynamic_sections_created |
| || (info->shared |
| && (info->symbolic || h->dynindx == -1) |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| { |
| rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); |
| rela.r_addend = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| } |
| else |
| { |
| BFD_ASSERT((h->got.offset & 1) == 0); |
| bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); |
| rela.r_addend = 0; |
| } |
| |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, |
| ((Elf64_External_Rela *) srela->contents |
| + srela->reloc_count)); |
| ++srela->reloc_count; |
| } |
| |
| if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| { |
| asection *s; |
| Elf_Internal_Rela rela; |
| |
| /* This symbols needs a copy reloc. Set it up. */ |
| |
| BFD_ASSERT (h->dynindx != -1 |
| && (h->root.type == bfd_link_hash_defined |
| || h->root.type == bfd_link_hash_defweak)); |
| |
| |
| s = bfd_get_section_by_name (h->root.u.def.section->owner, |
| ".rela.bss"); |
| BFD_ASSERT (s != NULL); |
| |
| rela.r_offset = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); |
| rela.r_addend = 0; |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, |
| ((Elf64_External_Rela *) s->contents |
| + s->reloc_count)); |
| ++s->reloc_count; |
| } |
| |
| /* Mark some specially defined symbols as absolute. */ |
| if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 |
| || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) |
| sym->st_shndx = SHN_ABS; |
| |
| return true; |
| } |
| |
| /* Finish up the dynamic sections. */ |
| |
| static boolean |
| elf_s390_finish_dynamic_sections (output_bfd, info) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| { |
| bfd *dynobj; |
| asection *sdyn; |
| asection *sgot; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| |
| sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| BFD_ASSERT (sgot != NULL); |
| sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| |
| if (elf_hash_table (info)->dynamic_sections_created) |
| { |
| asection *splt; |
| Elf64_External_Dyn *dyncon, *dynconend; |
| |
| BFD_ASSERT (sdyn != NULL); |
| |
| dyncon = (Elf64_External_Dyn *) sdyn->contents; |
| dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| for (; dyncon < dynconend; dyncon++) |
| { |
| Elf_Internal_Dyn dyn; |
| const char *name; |
| asection *s; |
| |
| bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); |
| |
| switch (dyn.d_tag) |
| { |
| default: |
| break; |
| |
| case DT_PLTGOT: |
| name = ".got"; |
| goto get_vma; |
| case DT_JMPREL: |
| name = ".rela.plt"; |
| get_vma: |
| s = bfd_get_section_by_name(output_bfd, name); |
| BFD_ASSERT (s != NULL); |
| dyn.d_un.d_ptr = s->vma; |
| bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| break; |
| |
| case DT_PLTRELSZ: |
| s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| BFD_ASSERT (s != NULL); |
| if (s->_cooked_size != 0) |
| dyn.d_un.d_val = s->_cooked_size; |
| else |
| dyn.d_un.d_val = s->_raw_size; |
| bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| break; |
| |
| case DT_RELASZ: |
| /* The procedure linkage table relocs (DT_JMPREL) should |
| not be included in the overall relocs (DT_RELA). |
| Therefore, we override the DT_RELASZ entry here to |
| make it not include the JMPREL relocs. Since the |
| linker script arranges for .rela.plt to follow all |
| other relocation sections, we don't have to worry |
| about changing the DT_RELA entry. */ |
| s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| if (s != NULL) |
| { |
| if (s->_cooked_size != 0) |
| dyn.d_un.d_val -= s->_cooked_size; |
| else |
| dyn.d_un.d_val -= s->_raw_size; |
| } |
| bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| break; |
| } |
| } |
| |
| /* Fill in the special first entry in the procedure linkage table. */ |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| if (splt && splt->_raw_size > 0) |
| { |
| /* fill in blueprint for plt 0 entry */ |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0, |
| splt->contents ); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1, |
| splt->contents +4 ); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3, |
| splt->contents +12 ); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4, |
| splt->contents +16 ); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5, |
| splt->contents +20 ); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD6, |
| splt->contents + 24); |
| bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD7, |
| splt->contents + 28 ); |
| /* Fixup relative address to start of GOT */ |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma + sgot->output_offset |
| - splt->output_section->vma - 6)/2, |
| splt->contents + 8); |
| } |
| |
| elf_section_data (splt->output_section)->this_hdr.sh_entsize = |
| PLT_ENTRY_SIZE; |
| } |
| |
| /* Set the first entry in the global offset table to the address of |
| the dynamic section. */ |
| if (sgot->_raw_size > 0) |
| { |
| if (sdyn == NULL) |
| bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents); |
| else |
| bfd_put_64 (output_bfd, |
| sdyn->output_section->vma + sdyn->output_offset, |
| sgot->contents); |
| |
| /* One entry for shared object struct ptr. */ |
| bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| /* One entry for _dl_runtime_resolve. */ |
| bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 12); |
| } |
| |
| elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 8; |
| |
| return true; |
| } |
| |
| static boolean |
| elf_s390_object_p (abfd) |
| bfd *abfd; |
| { |
| return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esame); |
| } |
| |
| /* |
| * Why was the hash table entry size definition changed from |
| * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and |
| * this is the only reason for the s390_elf64_size_info structure. |
| */ |
| |
| const struct elf_size_info s390_elf64_size_info = |
| { |
| sizeof (Elf64_External_Ehdr), |
| sizeof (Elf64_External_Phdr), |
| sizeof (Elf64_External_Shdr), |
| sizeof (Elf64_External_Rel), |
| sizeof (Elf64_External_Rela), |
| sizeof (Elf64_External_Sym), |
| sizeof (Elf64_External_Dyn), |
| sizeof (Elf_External_Note), |
| 8, /* hash-table entry size */ |
| 1, /* internal relocations per external relocations */ |
| 64, /* arch_size */ |
| 8, /* file_align */ |
| ELFCLASS64, EV_CURRENT, |
| bfd_elf64_write_out_phdrs, |
| bfd_elf64_write_shdrs_and_ehdr, |
| bfd_elf64_write_relocs, |
| bfd_elf64_swap_symbol_out, |
| bfd_elf64_slurp_reloc_table, |
| bfd_elf64_slurp_symbol_table, |
| bfd_elf64_swap_dyn_in, |
| bfd_elf64_swap_dyn_out, |
| NULL, |
| NULL, |
| NULL, |
| NULL |
| }; |
| |
| #define TARGET_BIG_SYM bfd_elf64_s390_vec |
| #define TARGET_BIG_NAME "elf64-s390" |
| #define ELF_ARCH bfd_arch_s390 |
| #define ELF_MACHINE_CODE EM_S390 |
| #define ELF_MACHINE_ALT1 EM_S390_OLD |
| #define ELF_MAXPAGESIZE 0x1000 |
| |
| #define elf_backend_size_info s390_elf64_size_info |
| |
| #define elf_backend_can_gc_sections 1 |
| #define elf_backend_want_got_plt 1 |
| #define elf_backend_plt_readonly 1 |
| #define elf_backend_want_plt_sym 0 |
| #define elf_backend_got_header_size 24 |
| #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| |
| #define elf_info_to_howto elf_s390_info_to_howto |
| |
| #define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link |
| #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name |
| #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create |
| #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup |
| |
| #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol |
| #define elf_backend_check_relocs elf_s390_check_relocs |
| #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections |
| #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections |
| #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol |
| #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook |
| #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook |
| #define elf_backend_relocate_section elf_s390_relocate_section |
| #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections |
| |
| #define elf_backend_object_p elf_s390_object_p |
| |
| #include "elf64-target.h" |