641 lines
18 KiB
C
641 lines
18 KiB
C
/* BFD back-end for AMD 29000 COFF binaries.
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Copyright 1990, 91, 92, 93, 94, 95, 1997 Free Software Foundation, Inc.
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Contributed by David Wood at New York University 7/8/91.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define A29K 1
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "coff/a29k.h"
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#include "coff/internal.h"
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#include "libcoff.h"
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static long get_symbol_value PARAMS ((asymbol *));
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static bfd_reloc_status_type a29k_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static boolean coff_a29k_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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struct internal_reloc *, struct internal_syment *, asection **));
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static boolean coff_a29k_adjust_symndx
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
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struct internal_reloc *, boolean *));
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#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
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#define INSERT_HWORD(WORD,HWORD) \
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(((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
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#define EXTRACT_HWORD(WORD) \
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((((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff))
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#define SIGN_EXTEND_HWORD(HWORD) \
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((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
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/* Provided the symbol, returns the value reffed */
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static long
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get_symbol_value (symbol)
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asymbol *symbol;
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{
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long relocation = 0;
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if (bfd_is_com_section (symbol->section))
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{
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relocation = 0;
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}
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else
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{
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relocation = symbol->value +
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symbol->section->output_section->vma +
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symbol->section->output_offset;
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}
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return(relocation);
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}
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/* this function is in charge of performing all the 29k relocations */
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static bfd_reloc_status_type
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a29k_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
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error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol_in;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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char **error_message;
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{
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/* the consth relocation comes in two parts, we have to remember
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the state between calls, in these variables */
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static boolean part1_consth_active = false;
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static unsigned long part1_consth_value;
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unsigned long insn;
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unsigned long sym_value;
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unsigned long unsigned_value;
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unsigned short r_type;
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long signed_value;
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unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
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bfd_byte *hit_data =addr + (bfd_byte *)(data);
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r_type = reloc_entry->howto->type;
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if (output_bfd) {
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/* Partial linking - do nothing */
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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if (symbol_in != NULL
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&& bfd_is_und_section (symbol_in->section))
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{
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/* Keep the state machine happy in case we're called again */
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if (r_type == R_IHIHALF)
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{
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part1_consth_active = true;
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part1_consth_value = 0;
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}
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return(bfd_reloc_undefined);
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}
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if ((part1_consth_active) && (r_type != R_IHCONST))
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{
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part1_consth_active = false;
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*error_message = (char *) "Missing IHCONST";
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return(bfd_reloc_dangerous);
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}
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sym_value = get_symbol_value(symbol_in);
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switch (r_type)
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{
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case R_IREL:
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insn = bfd_get_32(abfd, hit_data);
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/* Take the value in the field and sign extend it */
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signed_value = EXTRACT_HWORD(insn);
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signed_value = SIGN_EXTEND_HWORD(signed_value);
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signed_value <<= 2;
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/* See the note on the R_IREL reloc in coff_a29k_relocate_section. */
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if (signed_value == - (long) reloc_entry->address)
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signed_value = 0;
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signed_value += sym_value + reloc_entry->addend;
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if ((signed_value & ~0x3ffff) == 0)
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{ /* Absolute jmp/call */
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insn |= (1<<24); /* Make it absolute */
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/* FIXME: Should we change r_type to R_IABS */
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}
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else
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{
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/* Relative jmp/call, so subtract from the value the
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address of the place we're coming from */
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signed_value -= (reloc_entry->address
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+ input_section->output_section->vma
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+ input_section->output_offset);
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if (signed_value>0x1ffff || signed_value<-0x20000)
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return(bfd_reloc_overflow);
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}
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signed_value >>= 2;
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insn = INSERT_HWORD(insn, signed_value);
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bfd_put_32(abfd, insn ,hit_data);
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break;
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case R_ILOHALF:
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insn = bfd_get_32(abfd, hit_data);
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unsigned_value = EXTRACT_HWORD(insn);
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unsigned_value += sym_value + reloc_entry->addend;
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insn = INSERT_HWORD(insn, unsigned_value);
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bfd_put_32(abfd, insn, hit_data);
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break;
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case R_IHIHALF:
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insn = bfd_get_32(abfd, hit_data);
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/* consth, part 1
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Just get the symbol value that is referenced */
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part1_consth_active = true;
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part1_consth_value = sym_value + reloc_entry->addend;
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/* Don't modify insn until R_IHCONST */
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break;
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case R_IHCONST:
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insn = bfd_get_32(abfd, hit_data);
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/* consth, part 2
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Now relocate the reference */
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if (part1_consth_active == false) {
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*error_message = (char *) "Missing IHIHALF";
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return(bfd_reloc_dangerous);
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}
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/* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
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unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/
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unsigned_value += reloc_entry->addend; /* r_symndx */
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unsigned_value += part1_consth_value;
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unsigned_value = unsigned_value >> 16;
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insn = INSERT_HWORD(insn, unsigned_value);
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part1_consth_active = false;
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bfd_put_32(abfd, insn, hit_data);
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break;
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case R_BYTE:
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insn = bfd_get_8(abfd, hit_data);
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unsigned_value = insn + sym_value + reloc_entry->addend;
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if (unsigned_value & 0xffffff00)
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return(bfd_reloc_overflow);
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bfd_put_8(abfd, unsigned_value, hit_data);
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break;
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case R_HWORD:
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insn = bfd_get_16(abfd, hit_data);
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unsigned_value = insn + sym_value + reloc_entry->addend;
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if (unsigned_value & 0xffff0000)
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return(bfd_reloc_overflow);
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bfd_put_16(abfd, insn, hit_data);
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break;
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case R_WORD:
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insn = bfd_get_32(abfd, hit_data);
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insn += sym_value + reloc_entry->addend;
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bfd_put_32(abfd, insn, hit_data);
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break;
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default:
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*error_message = "Unrecognized reloc";
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return (bfd_reloc_dangerous);
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}
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return(bfd_reloc_ok);
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}
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/* type rightshift
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size
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bitsize
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pc-relative
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bitpos
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absolute
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complain_on_overflow
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special_function
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relocation name
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partial_inplace
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src_mask
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*/
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/*FIXME: I'm not real sure about this table */
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static reloc_howto_type howto_table[] =
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{
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{R_ABS, 0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS", true, 0xffffffff,0xffffffff, false},
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{1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}, {9}, {10},
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{11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
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{21}, {22}, {23},
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{R_IREL, 0, 3, 32, true, 0, complain_overflow_signed,a29k_reloc,"IREL", true, 0xffffffff,0xffffffff, false},
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{R_IABS, 0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS", true, 0xffffffff,0xffffffff, false},
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{R_ILOHALF, 0, 3, 16, true, 0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
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{R_IHIHALF, 0, 3, 16, true, 16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
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{R_IHCONST, 0, 3, 16, true, 0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
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{R_BYTE, 0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE", true, 0x000000ff,0x000000ff, false},
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{R_HWORD, 0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD", true, 0x0000ffff,0x0000ffff, false},
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{R_WORD, 0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD", true, 0xffffffff,0xffffffff, false},
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};
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#define BADMAG(x) A29KBADMAG(x)
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#define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
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reloc_processing(relent, reloc, symbols, abfd, section)
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static void
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reloc_processing (relent,reloc, symbols, abfd, section)
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arelent *relent;
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struct internal_reloc *reloc;
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asymbol **symbols;
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bfd *abfd;
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asection *section;
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{
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static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
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relent->address = reloc->r_vaddr;
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relent->howto = howto_table + reloc->r_type;
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if (reloc->r_type == R_IHCONST)
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{
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/* The address of an R_IHCONST should always be the address of
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the immediately preceding R_IHIHALF. relocs generated by gas
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are correct, but relocs generated by High C are different (I
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can't figure out what the address means for High C). We can
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handle both gas and High C by ignoring the address here, and
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simply reusing the address saved for R_IHIHALF. */
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if (ihihalf_vaddr == (bfd_vma) -1)
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abort ();
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relent->address = ihihalf_vaddr;
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ihihalf_vaddr = (bfd_vma) -1;
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relent->addend = reloc->r_symndx;
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relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
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}
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else
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{
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asymbol *ptr;
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relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
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ptr = *(relent->sym_ptr_ptr);
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if (ptr
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&& bfd_asymbol_bfd(ptr) == abfd
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&& ((ptr->flags & BSF_OLD_COMMON)== 0))
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{
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relent->addend = 0;
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}
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else
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{
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relent->addend = 0;
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}
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relent->address-= section->vma;
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if (reloc->r_type == R_IHIHALF)
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ihihalf_vaddr = relent->address;
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else if (ihihalf_vaddr != (bfd_vma) -1)
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abort ();
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}
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}
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/* The reloc processing routine for the optimized COFF linker. */
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static boolean
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coff_a29k_relocate_section (output_bfd, info, input_bfd, input_section,
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contents, relocs, syms, sections)
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bfd *output_bfd;
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struct bfd_link_info *info;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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struct internal_reloc *relocs;
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struct internal_syment *syms;
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asection **sections;
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{
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struct internal_reloc *rel;
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struct internal_reloc *relend;
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boolean hihalf;
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bfd_vma hihalf_val;
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/* If we are performing a relocateable link, we don't need to do a
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thing. The caller will take care of adjusting the reloc
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addresses and symbol indices. */
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if (info->relocateable)
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return true;
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hihalf = false;
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hihalf_val = 0;
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rel = relocs;
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relend = rel + input_section->reloc_count;
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for (; rel < relend; rel++)
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{
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long symndx;
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bfd_byte *loc;
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struct coff_link_hash_entry *h;
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struct internal_syment *sym;
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asection *sec;
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bfd_vma val;
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boolean overflow;
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unsigned long insn;
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long signed_value;
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unsigned long unsigned_value;
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bfd_reloc_status_type rstat;
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symndx = rel->r_symndx;
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loc = contents + rel->r_vaddr - input_section->vma;
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if (symndx == -1 || rel->r_type == R_IHCONST)
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h = NULL;
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else
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h = obj_coff_sym_hashes (input_bfd)[symndx];
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sym = NULL;
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sec = NULL;
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val = 0;
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/* An R_IHCONST reloc does not have a symbol. Instead, the
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symbol index is an addend. R_IHCONST is always used in
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conjunction with R_IHHALF. */
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if (rel->r_type != R_IHCONST)
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{
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if (h == NULL)
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{
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if (symndx == -1)
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sec = bfd_abs_section_ptr;
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else
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{
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sym = syms + symndx;
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sec = sections[symndx];
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val = (sec->output_section->vma
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+ sec->output_offset
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+ sym->n_value
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- sec->vma);
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}
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}
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else
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{
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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{
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sec = h->root.u.def.section;
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val = (h->root.u.def.value
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+ sec->output_section->vma
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+ sec->output_offset);
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}
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else
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{
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if (! ((*info->callbacks->undefined_symbol)
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(info, h->root.root.string, input_bfd, input_section,
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rel->r_vaddr - input_section->vma)))
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return false;
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}
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}
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if (hihalf)
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{
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if (! ((*info->callbacks->reloc_dangerous)
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(info, "missing IHCONST reloc", input_bfd,
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input_section, rel->r_vaddr - input_section->vma)))
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return false;
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hihalf = false;
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}
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}
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overflow = false;
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switch (rel->r_type)
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{
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default:
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bfd_set_error (bfd_error_bad_value);
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return false;
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case R_IREL:
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insn = bfd_get_32 (input_bfd, loc);
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/* Extract the addend. */
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signed_value = EXTRACT_HWORD (insn);
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signed_value = SIGN_EXTEND_HWORD (signed_value);
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signed_value <<= 2;
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/* Unfortunately, there are two different versions of COFF
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a29k. In the original AMD version, the value stored in
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the field for the R_IREL reloc is a simple addend. In
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the GNU version, the value is the negative of the address
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of the reloc within section. We try to cope here by
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assuming the AMD version, unless the addend is exactly
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the negative of the address; in the latter case we assume
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the GNU version. This means that something like
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.text
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nop
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jmp i-4
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will fail, because the addend of -4 will happen to equal
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the negative of the address within the section. The
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compiler will never generate code like this.
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At some point in the future we may want to take out this
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check. */
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if (signed_value == - (long) (rel->r_vaddr - input_section->vma))
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signed_value = 0;
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/* Determine the destination of the jump. */
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signed_value += val;
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if ((signed_value & ~0x3ffff) == 0)
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{
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/* We can use an absolute jump. */
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insn |= (1 << 24);
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}
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else
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{
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/* Make the destination PC relative. */
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signed_value -= (input_section->output_section->vma
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+ input_section->output_offset
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+ (rel->r_vaddr - input_section->vma));
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if (signed_value > 0x1ffff || signed_value < - 0x20000)
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{
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overflow = true;
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signed_value = 0;
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}
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}
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/* Put the adjusted value back into the instruction. */
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signed_value >>= 2;
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insn = INSERT_HWORD (insn, signed_value);
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bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
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break;
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case R_ILOHALF:
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insn = bfd_get_32 (input_bfd, loc);
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unsigned_value = EXTRACT_HWORD (insn);
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unsigned_value += val;
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insn = INSERT_HWORD (insn, unsigned_value);
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bfd_put_32 (input_bfd, insn, loc);
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break;
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case R_IHIHALF:
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/* Save the value for the R_IHCONST reloc. */
|
|
hihalf = true;
|
|
hihalf_val = val;
|
|
break;
|
|
|
|
case R_IHCONST:
|
|
if (! hihalf)
|
|
{
|
|
if (! ((*info->callbacks->reloc_dangerous)
|
|
(info, "missing IHIHALF reloc", input_bfd,
|
|
input_section, rel->r_vaddr - input_section->vma)))
|
|
return false;
|
|
hihalf_val = 0;
|
|
}
|
|
|
|
insn = bfd_get_32 (input_bfd, loc);
|
|
unsigned_value = rel->r_symndx + hihalf_val;
|
|
unsigned_value >>= 16;
|
|
insn = INSERT_HWORD (insn, unsigned_value);
|
|
bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
|
|
|
|
hihalf = false;
|
|
|
|
break;
|
|
|
|
case R_BYTE:
|
|
case R_HWORD:
|
|
case R_WORD:
|
|
rstat = _bfd_relocate_contents (howto_table + rel->r_type,
|
|
input_bfd, val, loc);
|
|
if (rstat == bfd_reloc_overflow)
|
|
overflow = true;
|
|
else if (rstat != bfd_reloc_ok)
|
|
abort ();
|
|
break;
|
|
}
|
|
|
|
if (overflow)
|
|
{
|
|
const char *name;
|
|
char buf[SYMNMLEN + 1];
|
|
|
|
if (symndx == -1)
|
|
name = "*ABS*";
|
|
else if (h != NULL)
|
|
name = h->root.root.string;
|
|
else if (sym == NULL)
|
|
name = "*unknown*";
|
|
else if (sym->_n._n_n._n_zeroes == 0
|
|
&& sym->_n._n_n._n_offset != 0)
|
|
name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
|
|
else
|
|
{
|
|
strncpy (buf, sym->_n._n_name, SYMNMLEN);
|
|
buf[SYMNMLEN] = '\0';
|
|
name = buf;
|
|
}
|
|
|
|
if (! ((*info->callbacks->reloc_overflow)
|
|
(info, name, howto_table[rel->r_type].name, (bfd_vma) 0,
|
|
input_bfd, input_section,
|
|
rel->r_vaddr - input_section->vma)))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#define coff_relocate_section coff_a29k_relocate_section
|
|
|
|
/* We don't want to change the symndx of a R_IHCONST reloc, since it
|
|
is actually an addend, not a symbol index at all. */
|
|
|
|
/*ARGSUSED*/
|
|
static boolean
|
|
coff_a29k_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
|
|
bfd *obfd;
|
|
struct bfd_link_info *info;
|
|
bfd *ibfd;
|
|
asection *sec;
|
|
struct internal_reloc *irel;
|
|
boolean *adjustedp;
|
|
{
|
|
if (irel->r_type == R_IHCONST)
|
|
*adjustedp = true;
|
|
else
|
|
*adjustedp = false;
|
|
return true;
|
|
}
|
|
|
|
#define coff_adjust_symndx coff_a29k_adjust_symndx
|
|
|
|
#include "coffcode.h"
|
|
|
|
const bfd_target a29kcoff_big_vec =
|
|
{
|
|
"coff-a29k-big", /* name */
|
|
bfd_target_coff_flavour,
|
|
BFD_ENDIAN_BIG, /* data byte order is big */
|
|
BFD_ENDIAN_BIG, /* header byte order is big */
|
|
|
|
(HAS_RELOC | EXEC_P | /* object flags */
|
|
HAS_LINENO | HAS_DEBUG |
|
|
HAS_SYMS | HAS_LOCALS | WP_TEXT),
|
|
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
|
|
| SEC_LOAD | SEC_RELOC
|
|
| SEC_READONLY ),
|
|
'_', /* leading underscore */
|
|
'/', /* ar_pad_char */
|
|
15, /* ar_max_namelen */
|
|
/* data */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
|
/* hdrs */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
|
|
|
{
|
|
|
|
_bfd_dummy_target,
|
|
coff_object_p,
|
|
bfd_generic_archive_p,
|
|
_bfd_dummy_target
|
|
},
|
|
{
|
|
bfd_false,
|
|
coff_mkobject,
|
|
_bfd_generic_mkarchive,
|
|
bfd_false
|
|
},
|
|
{
|
|
bfd_false,
|
|
coff_write_object_contents,
|
|
_bfd_write_archive_contents,
|
|
bfd_false
|
|
},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (coff),
|
|
BFD_JUMP_TABLE_COPY (coff),
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
BFD_JUMP_TABLE_SYMBOLS (coff),
|
|
BFD_JUMP_TABLE_RELOCS (coff),
|
|
BFD_JUMP_TABLE_WRITE (coff),
|
|
BFD_JUMP_TABLE_LINK (coff),
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
COFF_SWAP_TABLE
|
|
};
|