diff options
Diffstat (limited to 'contrib/binutils/bfd/elf64-s390.c')
| -rw-r--r-- | contrib/binutils/bfd/elf64-s390.c | 2392 |
1 files changed, 2392 insertions, 0 deletions
diff --git a/contrib/binutils/bfd/elf64-s390.c b/contrib/binutils/bfd/elf64-s390.c new file mode 100644 index 0000000..40f4908 --- /dev/null +++ b/contrib/binutils/bfd/elf64-s390.c @@ -0,0 +1,2392 @@ +/* IBM S/390-specific support for 64-bit ELF + Copyright 2000, 2001, 2002 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 *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 create_got_section + PARAMS((bfd *, struct bfd_link_info *)); +static boolean elf_s390_create_dynamic_sections + PARAMS((bfd *, struct bfd_link_info *)); +static void elf_s390_copy_indirect_symbol + PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); +static boolean elf_s390_check_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static asection *elf_s390_gc_mark_hook + PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, + struct elf_link_hash_entry *, Elf_Internal_Sym *)); +static boolean elf_s390_gc_sweep_hook + 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 allocate_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean readonly_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +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 enum elf_reloc_type_class elf_s390_reloc_type_class + PARAMS ((const Elf_Internal_Rela *)); +static boolean elf_s390_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean elf_s390_object_p PARAMS ((bfd *)); + +#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 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 (bfd_vma) 0xc0100000 +#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 +#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 +#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 +#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c +#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 +#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 +#define PLT_ENTRY_WORD7 (bfd_vma) 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 (bfd_vma) 0xe310f038 +#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 +#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 +#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 +#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 +#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 +#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 +#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 + +/* The s390 linker needs to keep track of the number of relocs that it + decides to copy as dynamic relocs in check_relocs for each symbol. + This is so that it can later discard them if they are found to be + unnecessary. We store the information in a field extending the + regular ELF linker hash table. */ + +struct elf_s390_dyn_relocs +{ + struct elf_s390_dyn_relocs *next; + + /* The input section of the reloc. */ + asection *sec; + + /* Total number of relocs copied for the input section. */ + bfd_size_type count; + + /* Number of pc-relative relocs copied for the input section. */ + bfd_size_type pc_count; +}; + +/* s390 ELF linker hash entry. */ + +struct elf_s390_link_hash_entry +{ + struct elf_link_hash_entry elf; + + /* Track dynamic relocs copied for this symbol. */ + struct elf_s390_dyn_relocs *dyn_relocs; +}; + +/* s390 ELF linker hash table. */ + +struct elf_s390_link_hash_table +{ + struct elf_link_hash_table elf; + + /* Short-cuts to get to dynamic linker sections. */ + asection *sgot; + asection *sgotplt; + asection *srelgot; + asection *splt; + asection *srelplt; + asection *sdynbss; + asection *srelbss; + + /* Small local sym to section mapping cache. */ + struct sym_sec_cache sym_sec; +}; + +/* 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 * +link_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, + sizeof (struct elf_s390_link_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = _bfd_elf_link_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct elf_s390_link_hash_entry *eh; + + eh = (struct elf_s390_link_hash_entry *) entry; + eh->dyn_relocs = NULL; + } + + return entry; +} + +/* 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; + bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); + + ret = (struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt); + if (ret == NULL) + return NULL; + + if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) + { + bfd_release (abfd, ret); + return NULL; + } + + ret->sgot = NULL; + ret->sgotplt = NULL; + ret->srelgot = NULL; + ret->splt = NULL; + ret->srelplt = NULL; + ret->sdynbss = NULL; + ret->srelbss = NULL; + ret->sym_sec.abfd = NULL; + + return &ret->elf.root; +} + +/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up + shortcuts to them in our hash table. */ + +static boolean +create_got_section (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + struct elf_s390_link_hash_table *htab; + + if (! _bfd_elf_create_got_section (dynobj, info)) + return false; + + htab = elf_s390_hash_table (info); + htab->sgot = bfd_get_section_by_name (dynobj, ".got"); + htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); + if (!htab->sgot || !htab->sgotplt) + abort (); + + htab->srelgot = bfd_make_section (dynobj, ".rela.got"); + if (htab->srelgot == NULL + || ! bfd_set_section_flags (dynobj, htab->srelgot, + (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS + | SEC_IN_MEMORY | SEC_LINKER_CREATED + | SEC_READONLY)) + || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) + return false; + return true; +} + +/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and + .rela.bss sections in DYNOBJ, and set up shortcuts to them in our + hash table. */ + +static boolean +elf_s390_create_dynamic_sections (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + struct elf_s390_link_hash_table *htab; + + htab = elf_s390_hash_table (info); + if (!htab->sgot && !create_got_section (dynobj, info)) + return false; + + if (!_bfd_elf_create_dynamic_sections (dynobj, info)) + return false; + + htab->splt = bfd_get_section_by_name (dynobj, ".plt"); + htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); + htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); + if (!info->shared) + htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); + + if (!htab->splt || !htab->srelplt || !htab->sdynbss + || (!info->shared && !htab->srelbss)) + abort (); + + return true; +} + +/* Copy the extra info we tack onto an elf_link_hash_entry. */ + +static void +elf_s390_copy_indirect_symbol (dir, ind) + struct elf_link_hash_entry *dir, *ind; +{ + struct elf_s390_link_hash_entry *edir, *eind; + + edir = (struct elf_s390_link_hash_entry *) dir; + eind = (struct elf_s390_link_hash_entry *) ind; + + if (eind->dyn_relocs != NULL) + { + if (edir->dyn_relocs != NULL) + { + struct elf_s390_dyn_relocs **pp; + struct elf_s390_dyn_relocs *p; + + if (ind->root.type == bfd_link_hash_indirect) + abort (); + + /* Add reloc counts against the weak sym to the strong sym + list. Merge any entries against the same section. */ + for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) + { + struct elf_s390_dyn_relocs *q; + + for (q = edir->dyn_relocs; q != NULL; q = q->next) + if (q->sec == p->sec) + { + q->pc_count += p->pc_count; + q->count += p->count; + *pp = p->next; + break; + } + if (q == NULL) + pp = &p->next; + } + *pp = edir->dyn_relocs; + } + + edir->dyn_relocs = eind->dyn_relocs; + eind->dyn_relocs = NULL; + } + + _bfd_elf_link_hash_copy_indirect (dir, ind); +} + +/* 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; +{ + struct elf_s390_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + asection *sreloc; + + if (info->relocateable) + return true; + + htab = elf_s390_hash_table (info); + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + 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 >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%s: bad symbol index: %d"), + bfd_archive_filename (abfd), + r_symndx); + return false; + } + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + 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 (h != NULL) + { + h->got.refcount += 1; + } + else + { + bfd_signed_vma *local_got_refcounts; + + /* This is a global offset table entry for a local symbol. */ + local_got_refcounts = elf_local_got_refcounts (abfd); + if (local_got_refcounts == NULL) + { + bfd_size_type size; + + size = symtab_hdr->sh_info; + size *= sizeof (bfd_signed_vma); + local_got_refcounts = ((bfd_signed_vma *) + bfd_zalloc (abfd, size)); + if (local_got_refcounts == NULL) + return false; + elf_local_got_refcounts (abfd) = local_got_refcounts; + } + local_got_refcounts[r_symndx] += 1; + } + /* Fall through */ + + case R_390_GOTOFF: + case R_390_GOTPC: + case R_390_GOTPCDBL: + if (htab->sgot == NULL) + { + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + if (!create_got_section (htab->elf.dynobj, info)) + return false; + } + 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; + + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + 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 && !info->shared) + { + /* If this reloc is in a read-only section, we might + need a copy reloc. We can't check reliably at this + stage whether the section is read-only, as input + sections have not yet been mapped to output sections. + Tentatively set the flag for now, and correct in + adjust_dynamic_symbol. */ + h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + + /* We may need a .plt entry if the function this reloc + refers to is in a shared lib. */ + h->plt.refcount += 1; + } + + /* 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). In case of a weak definition, + DEF_REGULAR may be cleared later by a strong definition in + a shared library. We account for that possibility below by + storing information in the relocs_copied field of the hash + table entry. A similar situation occurs when creating + shared libraries and symbol visibility changes render the + symbol local. + + If on the other hand, we are creating an executable, we + may need to keep relocations for symbols satisfied by a + dynamic library if we manage to avoid copy relocs for the + symbol. */ + if ((info->shared + && (sec->flags & SEC_ALLOC) != 0 + && ((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) + || (h != NULL + && (! info->symbolic + || h->root.type == bfd_link_hash_defweak + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + || (!info->shared + && (sec->flags & SEC_ALLOC) != 0 + && h != NULL + && (h->root.type == bfd_link_hash_defweak + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))) + { + struct elf_s390_dyn_relocs *p; + struct elf_s390_dyn_relocs **head; + + /* We must copy these reloc types into the output file. + Create a reloc section in dynobj and make room for + this reloc. */ + if (sreloc == NULL) + { + const char *name; + bfd *dynobj; + + 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; + + if (strncmp (name, ".rela", 5) != 0 + || strcmp (bfd_get_section_name (abfd, sec), + name + 5) != 0) + { + (*_bfd_error_handler) + (_("%s: bad relocation section name `%s\'"), + bfd_archive_filename (abfd), name); + } + + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + + dynobj = htab->elf.dynobj; + 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; + } + elf_section_data (sec)->sreloc = sreloc; + } + + /* If this is a global symbol, we count the number of + relocations we need for this symbol. */ + if (h != NULL) + { + head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; + } + else + { + /* Track dynamic relocs needed for local syms too. + We really need local syms available to do this + easily. Oh well. */ + + asection *s; + s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, + sec, r_symndx); + if (s == NULL) + return false; + + head = ((struct elf_s390_dyn_relocs **) + &elf_section_data (s)->local_dynrel); + } + + p = *head; + if (p == NULL || p->sec != sec) + { + bfd_size_type amt = sizeof *p; + p = ((struct elf_s390_dyn_relocs *) + bfd_alloc (htab->elf.dynobj, amt)); + if (p == NULL) + return false; + p->next = *head; + *head = p; + p->sec = sec; + p->count = 0; + p->pc_count = 0; + } + + p->count += 1; + if (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) + p->pc_count += 1; + } + 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 + { + 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; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + 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; + + elf_section_data (sec)->local_dynrel = NULL; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + local_got_refcounts = elf_local_got_refcounts (abfd); + + 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; + } + else if (local_got_refcounts != NULL) + { + if (local_got_refcounts[r_symndx] > 0) + local_got_refcounts[r_symndx] -= 1; + } + break; + + case R_390_8: + case R_390_12: + 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: + r_symndx = ELF64_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + struct elf_s390_link_hash_entry *eh; + struct elf_s390_dyn_relocs **pp; + struct elf_s390_dyn_relocs *p; + + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + if (!info->shared && h->plt.refcount > 0) + h->plt.refcount -= 1; + + eh = (struct elf_s390_link_hash_entry *) h; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + if (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) + p->pc_count -= 1; + p->count -= 1; + if (p->count == 0) + *pp = p->next; + break; + } + } + 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; +{ + struct elf_s390_link_hash_table *htab; + struct elf_s390_link_hash_entry * eh; + struct elf_s390_dyn_relocs *p; + asection *s; + unsigned int power_of_two; + + /* 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 (h->plt.refcount <= 0 + || (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 + && h->root.type != bfd_link_hash_undefweak + && h->root.type != bfd_link_hash_undefined)) + { + /* 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, or if all references were garbage collected. 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; + } + else + /* It's possible that we incorrectly decided a .plt reloc was + needed for an R_390_PC32 reloc to a non-function sym in + check_relocs. We can't decide accurately between function and + non-function syms in check-relocs; Objects loaded later in + the link may change h->type. So fix it now. */ + h->plt.offset = (bfd_vma) -1; + + /* 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; + + /* If -z nocopyreloc was given, we won't generate them either. */ + if (info->nocopyreloc) + { + h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; + return true; + } + + eh = (struct elf_s390_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + s = p->sec->output_section; + if (s != NULL && (s->flags & SEC_READONLY) != 0) + break; + } + + /* If we didn't find any dynamic relocs in read-only sections, then + we'll be keeping the dynamic relocs and avoiding the copy reloc. */ + if (p == NULL) + { + h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; + 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. */ + + htab = elf_s390_hash_table (info); + + /* 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. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) + { + htab->srelbss->_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 = htab->sdynbss; + s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); + if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) + { + if (! bfd_set_section_alignment (htab->elf.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; +} + +/* This is the condition under which elf_s390_finish_dynamic_symbol + will be called from elflink.h. If elflink.h doesn't call our + finish_dynamic_symbol routine, we'll need to do something about + initializing any .plt and .got entries in elf_s390_relocate_section. */ +#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ + ((DYN) \ + && ((INFO)->shared \ + || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ + && ((H)->dynindx != -1 \ + || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) + +/* Allocate space in .plt, .got and associated reloc sections for + dynamic relocs. */ + +static boolean +allocate_dynrelocs (h, inf) + struct elf_link_hash_entry *h; + PTR inf; +{ + struct bfd_link_info *info; + struct elf_s390_link_hash_table *htab; + struct elf_s390_link_hash_entry *eh; + struct elf_s390_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_indirect) + return true; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + info = (struct bfd_link_info *) inf; + htab = elf_s390_hash_table (info); + + if (htab->elf.dynamic_sections_created + && h->plt.refcount > 0) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) + { + asection *s = htab->splt; + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_FIRST_ENTRY_SIZE; + + h->plt.offset = s->_raw_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 = h->plt.offset; + } + + /* 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. */ + htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; + + /* We also need to make an entry in the .rela.plt section. */ + htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); + } + else + { + h->plt.offset = (bfd_vma) -1; + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; + } + } + else + { + h->plt.offset = (bfd_vma) -1; + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; + } + + if (h->got.refcount > 0) + { + asection *s; + boolean dyn; + + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + s = htab->sgot; + h->got.offset = s->_raw_size; + s->_raw_size += GOT_ENTRY_SIZE; + dyn = htab->elf.dynamic_sections_created; + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) + htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); + } + else + h->got.offset = (bfd_vma) -1; + + eh = (struct elf_s390_link_hash_entry *) h; + if (eh->dyn_relocs == NULL) + return true; + + /* In the shared -Bsymbolic case, discard space allocated for + dynamic pc-relative relocs against symbols which turn out to be + defined in regular objects. For the normal shared case, discard + space for pc-relative relocs that have become local due to symbol + visibility changes. */ + + if (info->shared) + { + if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 + && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 + || info->symbolic)) + { + struct elf_s390_dyn_relocs **pp; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) + { + p->count -= p->pc_count; + p->pc_count = 0; + if (p->count == 0) + *pp = p->next; + else + pp = &p->next; + } + } + } + else + { + /* For the non-shared case, discard space for relocs against + symbols which turn out to need copy relocs or are not + dynamic. */ + + if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 + && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + || (htab->elf.dynamic_sections_created + && (h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined)))) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + /* If that succeeded, we know we'll be keeping all the + relocs. */ + if (h->dynindx != -1) + goto keep; + } + + eh->dyn_relocs = NULL; + + keep: ; + } + + /* Finally, allocate space. */ + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *sreloc = elf_section_data (p->sec)->sreloc; + sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); + } + + return true; +} + +/* Find any dynamic relocs that apply to read-only sections. */ + +static boolean +readonly_dynrelocs (h, inf) + struct elf_link_hash_entry *h; + PTR inf; +{ + struct elf_s390_link_hash_entry *eh; + struct elf_s390_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + eh = (struct elf_s390_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *s = p->sec->output_section; + + if (s != NULL && (s->flags & SEC_READONLY) != 0) + { + struct bfd_link_info *info = (struct bfd_link_info *) inf; + + info->flags |= DF_TEXTREL; + + /* Not an error, just cut short the traversal. */ + return false; + } + } + return true; +} + +/* Set the sizes of the dynamic sections. */ + +static boolean +elf_s390_size_dynamic_sections (output_bfd, info) + bfd *output_bfd ATTRIBUTE_UNUSED; + struct bfd_link_info *info; +{ + struct elf_s390_link_hash_table *htab; + bfd *dynobj; + asection *s; + boolean relocs; + bfd *ibfd; + + htab = elf_s390_hash_table (info); + dynobj = htab->elf.dynobj; + if (dynobj == NULL) + abort (); + + if (htab->elf.dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (! info->shared) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + if (s == NULL) + abort (); + s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + + /* Set up .got offsets for local syms, and space for local dynamic + relocs. */ + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) + { + bfd_signed_vma *local_got; + bfd_signed_vma *end_local_got; + bfd_size_type locsymcount; + Elf_Internal_Shdr *symtab_hdr; + asection *srela; + + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) + continue; + + for (s = ibfd->sections; s != NULL; s = s->next) + { + struct elf_s390_dyn_relocs *p; + + for (p = *((struct elf_s390_dyn_relocs **) + &elf_section_data (s)->local_dynrel); + p != NULL; + p = p->next) + { + if (!bfd_is_abs_section (p->sec) + && bfd_is_abs_section (p->sec->output_section)) + { + /* Input section has been discarded, either because + it is a copy of a linkonce section or due to + linker script /DISCARD/, so we'll be discarding + the relocs too. */ + } + else if (p->count != 0) + { + srela = elf_section_data (p->sec)->sreloc; + srela->_raw_size += p->count * sizeof (Elf64_External_Rela); + if ((p->sec->output_section->flags & SEC_READONLY) != 0) + info->flags |= DF_TEXTREL; + } + } + } + + local_got = elf_local_got_refcounts (ibfd); + if (!local_got) + continue; + + symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; + locsymcount = symtab_hdr->sh_info; + end_local_got = local_got + locsymcount; + s = htab->sgot; + srela = htab->srelgot; + for (; local_got < end_local_got; ++local_got) + { + if (*local_got > 0) + { + *local_got = s->_raw_size; + s->_raw_size += GOT_ENTRY_SIZE; + if (info->shared) + srela->_raw_size += sizeof (Elf64_External_Rela); + } + else + *local_got = (bfd_vma) -1; + } + } + + /* Allocate global sym .plt and .got entries, and space for global + sym dynamic relocs. */ + elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); + + /* We now have determined the sizes of the various dynamic sections. + Allocate memory for them. */ + relocs = false; + for (s = dynobj->sections; s != NULL; s = s->next) + { + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + if (s == htab->splt + || s == htab->sgot + || s == htab->sgotplt) + { + /* Strip this section if we don't need it; see the + comment below. */ + } + else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) + { + if (s->_raw_size != 0 && s != htab->srelplt) + relocs = 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 + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + 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 + .rela.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. */ + + _bfd_strip_section_from_output (info, s); + continue; + } + + /* Allocate memory for the section contents. We use bfd_zalloc + here in case unused entries are not reclaimed before the + section's contents are written out. This should not happen, + but this way if it does, we get a R_390_NONE reloc instead + of garbage. */ + s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); + if (s->contents == NULL) + return false; + } + + if (htab->elf.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. */ +#define add_dynamic_entry(TAG, VAL) \ + bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) + + if (! info->shared) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return false; + } + + if (htab->splt->_raw_size != 0) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return false; + } + + if (relocs) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) + return false; + + /* If any dynamic relocs apply to a read-only section, + then we need a DT_TEXTREL entry. */ + if ((info->flags & DF_TEXTREL) == 0) + elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, + (PTR) info); + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return false; + } + } + } +#undef add_dynamic_entry + + 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; +{ + struct elf_s390_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_vma *local_got_offsets; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + + if (info->relocateable) + return true; + + htab = elf_s390_hash_table (info); + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + local_got_offsets = elf_local_got_offsets (input_bfd); + + 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 off; + bfd_vma relocation; + boolean unresolved_reloc; + bfd_reloc_status_type r; + + r_type = ELF64_R_TYPE (rel->r_info); + if (r_type == (int) R_390_GNU_VTINHERIT + || r_type == (int) 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); + h = NULL; + sym = NULL; + sec = NULL; + unresolved_reloc = false; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); + } + 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 (sec->output_section == NULL) + { + /* Set a flag that will be cleared later if we find a + relocation value for this symbol. output_section + is typically NULL for symbols satisfied by a shared + library. */ + unresolved_reloc = true; + 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->allow_shlib_undefined) + && !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. */ + if (htab->sgot == NULL) + abort (); + + if (h != NULL) + { + boolean dyn; + + off = h->got.offset; + dyn = htab->elf.dynamic_sections_created; + if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) + || (info->shared + && (info->symbolic + || h->dynindx == -1 + || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) + && (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, + htab->sgot->contents + off); + h->got.offset |= 1; + } + } + else + unresolved_reloc = false; + } + else + { + if (local_got_offsets == NULL) + abort (); + + 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, + htab->sgot->contents + off); + + if (info->shared) + { + asection *srelgot; + Elf_Internal_Rela outrel; + Elf64_External_Rela *loc; + + srelgot = htab->srelgot; + if (srelgot == NULL) + abort (); + + outrel.r_offset = (htab->sgot->output_section->vma + + htab->sgot->output_offset + + off); + outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); + outrel.r_addend = relocation; + loc = (Elf64_External_Rela *) srelgot->contents; + loc += srelgot->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); + } + + local_got_offsets[r_symndx] |= 1; + } + } + + if (off >= (bfd_vma) -2) + abort (); + + relocation = htab->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 += htab->sgot->output_section->vma; + + break; + + case R_390_GOTOFF: + /* Relocation is relative to the start of the global offset + table. */ + + /* 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 -= htab->sgot->output_section->vma; + + break; + + case R_390_GOTPC: + case R_390_GOTPCDBL: + /* Use global offset table as symbol value. */ + relocation = htab->sgot->output_section->vma; + unresolved_reloc = false; + 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 + || htab->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 = (htab->splt->output_section->vma + + htab->splt->output_offset + + h->plt.offset); + unresolved_reloc = false; + 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: + /* r_symndx will be zero only for relocs against symbols + from removed linkonce sections, or sections discarded by + a linker script. */ + if (r_symndx == 0 + || (input_section->flags & SEC_ALLOC) == 0) + break; + + if ((info->shared + && ((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) + || (h != NULL + && h->dynindx != -1 + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + || (!info->shared + && h != NULL + && h->dynindx != -1 + && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 + && (((h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0) + || h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined))) + { + Elf_Internal_Rela outrel; + boolean skip, relocate; + asection *sreloc; + Elf64_External_Rela *loc; + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + + skip = false; + relocate = false; + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset); + if (outrel.r_offset == (bfd_vma) -1) + skip = true; + else if (outrel.r_offset == (bfd_vma) -2) + skip = true, relocate = true; + + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + memset (&outrel, 0, sizeof outrel); + else if (h != NULL + && h->dynindx != -1 + && (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 + || !info->shared + || !info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)) + { + outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); + outrel.r_addend = rel->r_addend; + } + else + { + /* This symbol is local, or marked to become local. */ + relocate = true; + outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; + } + + sreloc = elf_section_data (input_section)->sreloc; + if (sreloc == NULL) + abort (); + + loc = (Elf64_External_Rela *) sreloc->contents; + loc += sreloc->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); + + /* 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; + } + + if (unresolved_reloc + && !(info->shared + && (input_section->flags & SEC_DEBUGGING) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) + (*_bfd_error_handler) + (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, + h->root.root.string); + + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + + if (r != bfd_reloc_ok) + { + 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 (r == bfd_reloc_overflow) + { + + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + } + else + { + (*_bfd_error_handler) + (_("%s(%s+0x%lx): reloc against `%s': error %d"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, name, (int) r); + return false; + } + } + } + + 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; +{ + struct elf_s390_link_hash_table *htab; + + htab = elf_s390_hash_table (info); + + if (h->plt.offset != (bfd_vma) -1) + { + bfd_vma plt_index; + bfd_vma got_offset; + Elf_Internal_Rela rela; + Elf64_External_Rela *loc; + + /* This symbol has an entry in the procedure linkage table. Set + it up. */ + + if (h->dynindx == -1 + || htab->splt == NULL + || htab->sgotplt == NULL + || htab->srelplt == NULL) + abort (); + + /* 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, (bfd_vma) PLT_ENTRY_WORD0, + htab->splt->contents + h->plt.offset); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, + htab->splt->contents + h->plt.offset + 4); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, + htab->splt->contents + h->plt.offset + 8); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, + htab->splt->contents + h->plt.offset + 12); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, + htab->splt->contents + h->plt.offset + 16); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, + htab->splt->contents + h->plt.offset + 20); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, + htab->splt->contents + h->plt.offset + 24); + bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, + htab->splt->contents + h->plt.offset + 28); + /* Fixup the relative address to the GOT entry */ + bfd_put_32 (output_bfd, + (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + got_offset + - (htab->splt->output_section->vma + h->plt.offset))/2, + htab->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, + htab->splt->contents + h->plt.offset + 24); + /* Fixup offset into symbol table */ + bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), + htab->splt->contents + h->plt.offset + 28); + + /* Fill in the entry in the global offset table. + Points to instruction after GOT offset. */ + bfd_put_64 (output_bfd, + (htab->splt->output_section->vma + + htab->splt->output_offset + + h->plt.offset + + 14), + htab->sgotplt->contents + got_offset); + + /* Fill in the entry in the .rela.plt section. */ + rela.r_offset = (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + + got_offset); + rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); + rela.r_addend = 0; + loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); + + 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. This is a clue + for the dynamic linker, to make function pointer + comparisons work between an application and shared + library. */ + sym->st_shndx = SHN_UNDEF; + } + } + + if (h->got.offset != (bfd_vma) -1) + { + Elf_Internal_Rela rela; + Elf64_External_Rela *loc; + + /* This symbol has an entry in the global offset table. Set it + up. */ + + if (htab->sgot == NULL || htab->srelgot == NULL) + abort (); + + rela.r_offset = (htab->sgot->output_section->vma + + htab->sgot->output_offset + + (h->got.offset &~ (bfd_vma) 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 (info->shared + && (info->symbolic + || h->dynindx == -1 + || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) + { + BFD_ASSERT((h->got.offset & 1) != 0); + 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, htab->sgot->contents + h->got.offset); + rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); + rela.r_addend = 0; + } + + loc = (Elf64_External_Rela *) htab->srelgot->contents; + loc += htab->srelgot->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); + } + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) + { + Elf_Internal_Rela rela; + Elf64_External_Rela *loc; + + /* This symbols needs a copy reloc. Set it up. */ + + if (h->dynindx == -1 + || (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak) + || htab->srelbss == NULL) + abort (); + + 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; + loc = (Elf64_External_Rela *) htab->srelbss->contents; + loc += htab->srelbss->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); + } + + /* 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; +} + +/* Used to decide how to sort relocs in an optimal manner for the + dynamic linker, before writing them out. */ + +static enum elf_reloc_type_class +elf_s390_reloc_type_class (rela) + const Elf_Internal_Rela *rela; +{ + switch ((int) ELF64_R_TYPE (rela->r_info)) + { + case R_390_RELATIVE: + return reloc_class_relative; + case R_390_JMP_SLOT: + return reloc_class_plt; + case R_390_COPY: + return reloc_class_copy; + default: + return reloc_class_normal; + } +} + +/* Finish up the dynamic sections. */ + +static boolean +elf_s390_finish_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + struct elf_s390_link_hash_table *htab; + bfd *dynobj; + asection *sdyn; + + htab = elf_s390_hash_table (info); + dynobj = htab->elf.dynobj; + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + + if (htab->elf.dynamic_sections_created) + { + Elf64_External_Dyn *dyncon, *dynconend; + + if (sdyn == NULL || htab->sgot == NULL) + abort (); + + dyncon = (Elf64_External_Dyn *) sdyn->contents; + dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + asection *s; + + bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + continue; + + case DT_PLTGOT: + dyn.d_un.d_ptr = htab->sgot->output_section->vma; + break; + + case DT_JMPREL: + dyn.d_un.d_ptr = htab->srelplt->output_section->vma; + break; + + case DT_PLTRELSZ: + s = htab->srelplt->output_section; + if (s->_cooked_size != 0) + dyn.d_un.d_val = s->_cooked_size; + else + dyn.d_un.d_val = s->_raw_size; + 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 = htab->srelplt->output_section; + if (s->_cooked_size != 0) + dyn.d_un.d_val -= s->_cooked_size; + else + dyn.d_un.d_val -= s->_raw_size; + break; + } + + bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); + } + + /* Fill in the special first entry in the procedure linkage table. */ + if (htab->splt && htab->splt->_raw_size > 0) + { + /* fill in blueprint for plt 0 entry */ + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, + htab->splt->contents ); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, + htab->splt->contents +4 ); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, + htab->splt->contents +12 ); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, + htab->splt->contents +16 ); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, + htab->splt->contents +20 ); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, + htab->splt->contents + 24); + bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, + htab->splt->contents + 28 ); + /* Fixup relative address to start of GOT */ + bfd_put_32 (output_bfd, + (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + - htab->splt->output_section->vma - 6)/2, + htab->splt->contents + 8); + } + elf_section_data (htab->splt->output_section) + ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; + } + + if (htab->sgotplt) + { + /* Fill in the first three entries in the global offset table. */ + if (htab->sgotplt->_raw_size > 0) + { + bfd_put_64 (output_bfd, + (sdyn == NULL ? (bfd_vma) 0 + : sdyn->output_section->vma + sdyn->output_offset), + htab->sgotplt->contents); + /* One entry for shared object struct ptr. */ + bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); + /* One entry for _dl_runtime_resolve. */ + bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); + } + + elf_section_data (htab->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_64); +} + +/* + * 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_can_refcount 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_backend_rela_normal 1 + +#define elf_info_to_howto elf_s390_info_to_howto + +#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_copy_indirect_symbol elf_s390_copy_indirect_symbol +#define elf_backend_create_dynamic_sections elf_s390_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_reloc_type_class elf_s390_reloc_type_class +#define elf_backend_relocate_section elf_s390_relocate_section +#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections +#define elf_backend_reloc_type_class elf_s390_reloc_type_class + +#define elf_backend_object_p elf_s390_object_p + +#include "elf64-target.h" |
