339 lines
10 KiB
C
339 lines
10 KiB
C
/* BFD back-end for AMD 29000 COFF binaries.
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Copyright 1990, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, 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 "obstack.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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#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)|0xffff0000 : (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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DEFUN(a29k_reloc,(abfd, reloc_entry, symbol_in, data, input_section, output_bfd),
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bfd *abfd AND
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arelent *reloc_entry AND
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asymbol *symbol_in AND
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PTR data AND
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asection *input_section AND
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bfd *output_bfd)
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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 && (symbol_in->section == &bfd_und_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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fprintf(stderr,"Relocation problem : ");
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fprintf(stderr,"Missing IHCONST in module %s\n",abfd->filename);
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part1_consth_active = false;
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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) << 2;
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signed_value = SIGN_EXTEND_HWORD(signed_value);
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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_outofrange);
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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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fprintf(stderr,"Relocation problem : ");
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fprintf(stderr,"IHIHALF missing in module %s\n",
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abfd->filename);
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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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fprintf(stderr,"Relocation problem : ");
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fprintf(stderr,"byte value too large in module %s\n",
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abfd->filename);
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return(bfd_reloc_overflow);
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}
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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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fprintf(stderr,"Relocation problem : ");
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fprintf(stderr,"hword value too large in module %s\n",
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abfd->filename);
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return(bfd_reloc_overflow);
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}
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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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fprintf(stderr,"Relocation problem : ");
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fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
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r_type,abfd->filename);
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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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#define NA 0 /* Obsolete fields, via the documentation */
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#define NAB false
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static reloc_howto_type howto_table[] =
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{
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{R_ABS, 0, 3, NA, false, NA, NAB, true,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, NA, true, NA, NAB, true,a29k_reloc,"IREL", true, 0xffffffff,0xffffffff, false},
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{R_IABS, 0, 3, NA, false, NA, NAB, true,a29k_reloc,"IABS", true, 0xffffffff,0xffffffff, false},
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{R_ILOHALF, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
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{R_IHIHALF, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
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{R_IHCONST, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
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{R_BYTE, 0, 0, NA, false, NA, NAB, true,a29k_reloc,"BYTE", true, 0x000000ff,0x000000ff, false},
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{R_HWORD, 0, 1, NA, false, NA, NAB, true,a29k_reloc,"HWORD", true, 0x0000ffff,0x0000ffff, false},
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{R_WORD, 0, 2, NA, false, NA, NAB, true,a29k_reloc,"WORD", true, 0xffffffff,0xffffffff, false},
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};
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#undef NA
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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 DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
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arelent *relent AND
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struct internal_reloc *reloc AND
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asymbol **symbols AND
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bfd *abfd AND
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asection *section)
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{
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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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relent->addend = reloc->r_symndx;
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relent->sym_ptr_ptr= bfd_abs_section.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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}
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}
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#include "coffcode.h"
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bfd_target a29kcoff_big_vec =
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{
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"coff-a29k-big", /* name */
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bfd_target_coff_flavour,
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true, /* data byte order is big */
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true, /* header byte order is big */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
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(SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
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| SEC_LOAD | SEC_RELOC
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| SEC_READONLY ),
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'_', /* leading underscore */
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'/', /* ar_pad_char */
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15, /* ar_max_namelen */
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2, /* minimum section alignment */
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/* data */
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_do_getb64, _do_putb64, _do_getb32,
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_do_putb32, _do_getb16, _do_putb16,
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/* hdrs */
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_do_getb64, _do_putb64, _do_getb32,
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_do_putb32, _do_getb16, _do_putb16,
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{
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_bfd_dummy_target,
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coff_object_p,
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bfd_generic_archive_p,
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_bfd_dummy_target
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},
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{
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bfd_false,
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coff_mkobject,
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_bfd_generic_mkarchive,
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bfd_false
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},
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{
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bfd_false,
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coff_write_object_contents,
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_bfd_write_archive_contents,
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bfd_false
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},
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JUMP_TABLE(coff),
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COFF_SWAP_TABLE
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};
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