+++ /dev/null
-/* TXVU-specific support for 32-bit ELF.
- Copyright (C) 1997, 1998 Free Software Foundation, Inc.
-
-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 "libbfd.h"
-#include "elf-bfd.h"
-#include "elf/txvu.h"
-
-static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
- PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
-static void txvu_info_to_howto_rel
- PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
-static boolean txvu_elf_relocate_section
- PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
- Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
-
-/* Use RELA, not REL. REL incurs complications one would rather not
- deal with. */
-/*#define USE_REL*/
-
-static reloc_howto_type txvu_elf_howto_table[] =
-{
- /* This reloc does nothing. */
- HOWTO (R_TXVU_NONE, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_TXVU_NONE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A PC Relative 11-bit relocation, shifted by 3.
- Fortunately, the lower instruction has the lower address in the 64 bit
- pair. Thus we can treat the address of the instruction as a whole
- as the address of the lower instruction (the one with the branch),
- and pretend the instruction size is 32 bits.
- Otherwise, we'd have to either perform the relocation on all 64 bits
- (since the pc relative address is the start of the pair), or set the
- address of the reloc as the address of the lower instruction and do what
- is done for R_M32R_10_PCREL which is to mask off the lower 3 bits of the
- pc before performing the reloc. */
- HOWTO (R_TXVU_11_PCREL, /* type */
- 3, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 11, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_TXVU_11_PCREL", /* name */
- false, /* partial_inplace */
- 0x1ff, /* src_mask */
- 0x1ff, /* dst_mask */
- true), /* pcrel_offset */
-};
-\f
-/* Map BFD reloc types to TXVU ELF reloc types. */
-
-struct txvu_reloc_map
-{
- unsigned char bfd_reloc_val;
- unsigned char elf_reloc_val;
-};
-
-static const struct txvu_reloc_map txvu_reloc_map[] =
-{
- { BFD_RELOC_NONE, R_TXVU_NONE },
- { BFD_RELOC_TXVU_11_PCREL, R_TXVU_11_PCREL }
-};
-
-static reloc_howto_type *
-bfd_elf32_bfd_reloc_type_lookup (abfd, code)
- bfd *abfd;
- bfd_reloc_code_real_type code;
-{
- unsigned int i;
-
- for (i = 0;
- i < sizeof (txvu_reloc_map) / sizeof (struct txvu_reloc_map);
- i++)
- {
- if (txvu_reloc_map[i].bfd_reloc_val == code)
- return &txvu_elf_howto_table[txvu_reloc_map[i].elf_reloc_val];
- }
-
- return NULL;
-}
-
-/* Set the howto pointer for an TXVU ELF reloc. */
-
-static void
-txvu_info_to_howto_rel (abfd, cache_ptr, dst)
- bfd *abfd;
- arelent *cache_ptr;
- Elf32_Internal_Rela *dst;
-{
- unsigned int r_type = ELF32_R_TYPE (dst->r_info);
- BFD_ASSERT (r_type < (unsigned int) R_TXVU_max);
- cache_ptr->howto = &txvu_elf_howto_table[r_type];
-}
-\f
-/* Relocate a TXVU ELF section.
-
- The RELOCATE_SECTION function is called by the new ELF backend linker
- to handle the relocations for a section.
-
- The relocs are always passed as Rela structures; if the section
- actually uses Rel structures, the r_addend field will always be
- zero.
-
- This function is responsible for adjust the section contents as
- necessary, and (if using Rela relocs and generating a
- relocateable output file) adjusting the reloc addend as
- necessary.
-
- This function does not have to worry about setting the reloc
- address or the reloc symbol index.
-
- LOCAL_SYMS is a pointer to the swapped in local symbols.
-
- LOCAL_SECTIONS is an array giving the section in the input file
- corresponding to the st_shndx field of each local symbol.
-
- The global hash table entry for the global symbols can be found
- via elf_sym_hashes (input_bfd).
-
- When generating relocateable output, this function must handle
- STB_LOCAL/STT_SECTION symbols specially. The output symbol is
- going to be the section symbol corresponding to the output
- section, which means that the addend must be adjusted
- accordingly. */
-
-static boolean
-txvu_elf_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;
-{
- Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
- Elf_Internal_Rela *rel, *relend;
- bfd *dynobj = elf_hash_table (info)->dynobj;
- /* Assume success. */
- boolean ret = true;
-
- rel = relocs;
- relend = relocs + input_section->reloc_count;
- for (; rel < relend; rel++)
- {
- int r_type;
- reloc_howto_type *howto;
- unsigned long r_symndx;
- /* We can't modify r_addend here as elf_link_input_bfd has an assert to
- ensure it's zero (we use REL relocs, not RELA). Therefore this
- should be assigning zero to `addend', but for clarity we use
- `r_addend'. */
- /* ??? The previous comment is old, revisit and delete. */
- bfd_vma addend = rel->r_addend;
- bfd_vma offset = rel->r_offset;
- struct elf_link_hash_entry *h;
- Elf_Internal_Sym *sym;
- asection *sec;
- const char *sym_name;
- bfd_reloc_status_type r;
- const char *errmsg = NULL;
-
- r_type = ELF32_R_TYPE (rel->r_info);
- if (r_type < 0 || r_type >= (int) R_TXVU_max)
- {
- (*_bfd_error_handler) ("%s: unknown relocation type %d",
- bfd_get_filename (input_bfd),
- (int) r_type);
- bfd_set_error (bfd_error_bad_value);
- ret = false;
- continue;
- }
-
- howto = txvu_elf_howto_table + r_type;
- r_symndx = ELF32_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. */
- sec = NULL;
- if (r_symndx >= symtab_hdr->sh_info)
- {
- /* External symbol. */
- continue;
- }
-
- /* Local symbol. */
- sym = local_syms + r_symndx;
- sym_name = "<local symbol>";
- /* STT_SECTION: symbol is associated with a section. */
- if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
- {
- /* Symbol isn't associated with a section. Nothing to do. */
- continue;
- }
-
- sec = local_sections[r_symndx];
- addend += sec->output_offset + sym->st_value;
- rel->r_addend = addend;
-
- /* Addends are stored with relocs. We're done. */
- continue;
- }
- else
- {
- bfd_vma relocation;
-
- /* This is a final link. */
- h = NULL;
- sym = NULL;
- sec = NULL;
-
- if (r_symndx < symtab_hdr->sh_info)
- {
- /* Local symbol. */
- sym = local_syms + r_symndx;
- sec = local_sections[r_symndx];
- sym_name = "<local symbol>";
- relocation = (sec->output_section->vma
- + sec->output_offset
- + sym->st_value);
- }
- else
- {
- /* External symbol. */
- 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;
- sym_name = h->root.root.string;
-
- 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)
- 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->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd,
- input_section, offset)))
- return false;
- relocation = 0;
- }
- }
-
- /* Sanity check the address. */
- if (offset > input_section->_raw_size)
- {
- r = bfd_reloc_outofrange;
- goto check_reloc;
- }
-
- switch ((int) r_type)
- {
- /* insert reloc handling code here */
- default :
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, offset,
- relocation, addend);
- break;
- }
- }
-
- check_reloc:
-
- if (r != bfd_reloc_ok)
- {
- /* FIXME: This should be generic enough to go in a utility. */
- 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 || *name == '\0')
- name = bfd_section_name (input_bfd, sec);
- }
-
- if (errmsg != NULL)
- goto common_error;
-
- switch (r)
- {
- case bfd_reloc_overflow:
- if (! ((*info->callbacks->reloc_overflow)
- (info, name, howto->name, (bfd_vma) 0,
- input_bfd, input_section, offset)))
- return false;
- break;
-
- case bfd_reloc_undefined:
- if (! ((*info->callbacks->undefined_symbol)
- (info, name, input_bfd, input_section,
- offset)))
- return false;
- break;
-
- case bfd_reloc_outofrange:
- errmsg = "internal error: out of range error";
- goto common_error;
-
- case bfd_reloc_notsupported:
- errmsg = "internal error: unsupported relocation error";
- goto common_error;
-
- case bfd_reloc_dangerous:
- errmsg = "internal error: dangerous error";
- goto common_error;
-
- default:
- errmsg = "internal error: unknown error";
- /* fall through */
-
- common_error:
- if (!((*info->callbacks->warning)
- (info, errmsg, name, input_bfd, input_section,
- offset)))
- return false;
- break;
- }
- }
- }
-
- return ret;
-}
-\f
-#define ELF_ARCH bfd_arch_txvu
-#define ELF_MACHINE_CODE EM_CYGNUS_TXVU
-#define ELF_MAXPAGESIZE 0x1000
-
-#define TARGET_BIG_SYM bfd_elf32_txvu_vec
-#define TARGET_BIG_NAME "elf32-txvu"
-
-#define elf_info_to_howto txvu_info_to_howto_rel
-#define elf_backend_relocate_section txvu_elf_relocate_section
-
-#include "elf32-target.h"
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