mirror of
https://github.com/darlinghq/darling-gdb.git
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549 lines
15 KiB
C
549 lines
15 KiB
C
/* BFD back-end for i386 a.out binaries under LynxOS.
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Copyright (C) 1990-2016 Free Software Foundation, Inc.
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#define TEXT_START_ADDR 0
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#define TARGET_PAGE_SIZE 4096
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#define SEGMENT_SIZE TARGET_PAGE_SIZE
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#define DEFAULT_ARCH bfd_arch_i386
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/* Do not "beautify" the CONCAT* macro args. Traditional C will not
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remove whitespace added here, and thus will fail to concatenate
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the tokens. */
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#define MY(OP) CONCAT2 (i386_aout_lynx_,OP)
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#define TARGETNAME "a.out-i386-lynx"
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#ifndef WRITE_HEADERS
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#define WRITE_HEADERS(abfd, execp) \
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{ \
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if (adata(abfd).magic == undecided_magic) \
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NAME(aout,adjust_sizes_and_vmas) (abfd); \
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\
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execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \
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execp->a_entry = bfd_get_start_address (abfd); \
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\
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execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \
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obj_reloc_entry_size (abfd)); \
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execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \
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obj_reloc_entry_size (abfd)); \
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NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes); \
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\
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if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 \
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|| bfd_bwrite (&exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, \
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abfd) != EXEC_BYTES_SIZE) \
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return FALSE; \
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/* Now write out reloc info, followed by syms and strings */ \
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\
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if (bfd_get_symcount (abfd) != 0) \
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{ \
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if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (execp)), SEEK_SET) \
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!= 0) \
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return FALSE; \
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\
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if (! NAME(aout,write_syms) (abfd)) return FALSE; \
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\
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if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (execp)), SEEK_SET) \
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!= 0) \
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return FALSE; \
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\
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if (!NAME(lynx,squirt_out_relocs) (abfd, obj_textsec (abfd))) \
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return FALSE; \
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if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (execp)), SEEK_SET) \
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!= 0) \
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return 0; \
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\
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if (!NAME(lynx,squirt_out_relocs) (abfd, obj_datasec (abfd))) \
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return FALSE; \
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} \
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}
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#endif
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#include "libaout.h"
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#include "aout/aout64.h"
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#ifdef LYNX_CORE
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char *lynx_core_file_failing_command ();
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int lynx_core_file_failing_signal ();
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bfd_boolean lynx_core_file_matches_executable_p ();
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const bfd_target *lynx_core_file_p ();
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#define MY_core_file_failing_command lynx_core_file_failing_command
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#define MY_core_file_failing_signal lynx_core_file_failing_signal
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#define MY_core_file_matches_executable_p lynx_core_file_matches_executable_p
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#define MY_core_file_p lynx_core_file_p
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#endif /* LYNX_CORE */
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#define KEEPIT udata.i
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extern reloc_howto_type aout_32_ext_howto_table[];
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extern reloc_howto_type aout_32_std_howto_table[];
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/* Standard reloc stuff */
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/* Output standard relocation information to a file in target byte order. */
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static void
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NAME(lynx,swap_std_reloc_out) (bfd *abfd,
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arelent *g,
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struct reloc_std_external *natptr)
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{
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int r_index;
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asymbol *sym = *(g->sym_ptr_ptr);
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int r_extern;
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unsigned int r_length;
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int r_pcrel;
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int r_baserel, r_jmptable, r_relative;
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asection *output_section = sym->section->output_section;
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PUT_WORD (abfd, g->address, natptr->r_address);
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r_length = g->howto->size; /* Size as a power of two */
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r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
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/* r_baserel, r_jmptable, r_relative??? FIXME-soon */
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r_baserel = 0;
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r_jmptable = 0;
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r_relative = 0;
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/* name was clobbered by aout_write_syms to be symbol index */
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/* If this relocation is relative to a symbol then set the
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r_index to the symbols index, and the r_extern bit.
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Absolute symbols can come in in two ways, either as an offset
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from the abs section, or as a symbol which has an abs value.
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check for that here
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*/
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if (bfd_is_com_section (output_section)
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|| bfd_is_abs_section (output_section)
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|| bfd_is_und_section (output_section))
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{
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if (bfd_abs_section_ptr->symbol == sym)
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{
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/* Whoops, looked like an abs symbol, but is really an offset
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from the abs section */
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r_index = 0;
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r_extern = 0;
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}
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else
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{
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/* Fill in symbol */
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r_extern = 1;
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r_index = (*g->sym_ptr_ptr)->KEEPIT;
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}
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}
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else
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{
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/* Just an ordinary section */
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r_extern = 0;
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r_index = output_section->target_index;
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}
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/* now the fun stuff */
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if (bfd_header_big_endian (abfd))
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{
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natptr->r_index[0] = r_index >> 16;
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natptr->r_index[1] = r_index >> 8;
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natptr->r_index[2] = r_index;
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natptr->r_type[0] =
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(r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
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| (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
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| (r_baserel ? RELOC_STD_BITS_BASEREL_BIG : 0)
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| (r_jmptable ? RELOC_STD_BITS_JMPTABLE_BIG : 0)
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| (r_relative ? RELOC_STD_BITS_RELATIVE_BIG : 0)
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| (r_length << RELOC_STD_BITS_LENGTH_SH_BIG);
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}
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else
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{
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natptr->r_index[2] = r_index >> 16;
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natptr->r_index[1] = r_index >> 8;
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natptr->r_index[0] = r_index;
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natptr->r_type[0] =
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(r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0)
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| (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0)
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| (r_baserel ? RELOC_STD_BITS_BASEREL_LITTLE : 0)
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| (r_jmptable ? RELOC_STD_BITS_JMPTABLE_LITTLE : 0)
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| (r_relative ? RELOC_STD_BITS_RELATIVE_LITTLE : 0)
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| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE);
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}
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}
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/* Extended stuff */
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/* Output extended relocation information to a file in target byte order. */
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static void
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NAME(lynx,swap_ext_reloc_out) (bfd *abfd,
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arelent *g,
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struct reloc_ext_external *natptr)
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{
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int r_index;
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int r_extern;
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unsigned int r_type;
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unsigned int r_addend;
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asymbol *sym = *(g->sym_ptr_ptr);
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asection *output_section = sym->section->output_section;
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PUT_WORD (abfd, g->address, natptr->r_address);
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r_type = (unsigned int) g->howto->type;
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r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
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/* If this relocation is relative to a symbol then set the
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r_index to the symbols index, and the r_extern bit.
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Absolute symbols can come in in two ways, either as an offset
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from the abs section, or as a symbol which has an abs value.
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check for that here
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*/
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if (bfd_is_com_section (output_section)
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|| bfd_is_abs_section (output_section)
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|| bfd_is_und_section (output_section))
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{
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if (bfd_abs_section_ptr->symbol == sym)
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{
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/* Whoops, looked like an abs symbol, but is really an offset
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from the abs section */
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r_index = 0;
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r_extern = 0;
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}
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else
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{
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r_extern = 1;
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r_index = (*g->sym_ptr_ptr)->KEEPIT;
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}
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}
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else
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{
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/* Just an ordinary section */
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r_extern = 0;
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r_index = output_section->target_index;
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}
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/* now the fun stuff */
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if (bfd_header_big_endian (abfd))
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{
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natptr->r_index[0] = r_index >> 16;
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natptr->r_index[1] = r_index >> 8;
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natptr->r_index[2] = r_index;
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natptr->r_type[0] =
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(r_extern ? RELOC_EXT_BITS_EXTERN_BIG : 0)
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| (r_type << RELOC_EXT_BITS_TYPE_SH_BIG);
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}
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else
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{
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natptr->r_index[2] = r_index >> 16;
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natptr->r_index[1] = r_index >> 8;
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natptr->r_index[0] = r_index;
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natptr->r_type[0] =
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(r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0)
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| (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE);
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}
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PUT_WORD (abfd, r_addend, natptr->r_addend);
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}
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/* BFD deals internally with all things based from the section they're
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in. so, something in 10 bytes into a text section with a base of
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50 would have a symbol (.text+10) and know .text vma was 50.
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Aout keeps all it's symbols based from zero, so the symbol would
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contain 60. This macro subs the base of each section from the value
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to give the true offset from the section */
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#define MOVE_ADDRESS(ad) \
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if (r_extern) \
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{ \
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/* undefined symbol */ \
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cache_ptr->sym_ptr_ptr = symbols + r_index; \
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cache_ptr->addend = ad; \
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} \
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else \
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{ \
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/* defined, section relative. replace symbol with pointer to \
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symbol which points to section */ \
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switch (r_index) { \
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case N_TEXT: \
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case N_TEXT | N_EXT: \
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cache_ptr->sym_ptr_ptr = obj_textsec(abfd)->symbol_ptr_ptr; \
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cache_ptr->addend = ad - su->textsec->vma; \
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break; \
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case N_DATA: \
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case N_DATA | N_EXT: \
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cache_ptr->sym_ptr_ptr = obj_datasec(abfd)->symbol_ptr_ptr; \
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cache_ptr->addend = ad - su->datasec->vma; \
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break; \
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case N_BSS: \
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case N_BSS | N_EXT: \
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cache_ptr->sym_ptr_ptr = obj_bsssec(abfd)->symbol_ptr_ptr; \
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cache_ptr->addend = ad - su->bsssec->vma; \
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break; \
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default: \
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case N_ABS: \
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case N_ABS | N_EXT: \
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cache_ptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; \
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cache_ptr->addend = ad; \
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break; \
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} \
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} \
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static void
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NAME(lynx,swap_ext_reloc_in) (bfd *abfd,
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struct reloc_ext_external *bytes,
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arelent *cache_ptr,
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asymbol **symbols,
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bfd_size_type symcount ATTRIBUTE_UNUSED)
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{
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int r_index;
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int r_extern;
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unsigned int r_type;
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struct aoutdata *su = &(abfd->tdata.aout_data->a);
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cache_ptr->address = (GET_SWORD (abfd, bytes->r_address));
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r_index = bytes->r_index[1];
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r_extern = (0 != (bytes->r_index[0] & RELOC_EXT_BITS_EXTERN_BIG));
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r_type = (bytes->r_index[0] & RELOC_EXT_BITS_TYPE_BIG)
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>> RELOC_EXT_BITS_TYPE_SH_BIG;
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cache_ptr->howto = aout_32_ext_howto_table + r_type;
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MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
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}
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static void
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NAME(lynx,swap_std_reloc_in) (bfd *abfd,
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struct reloc_std_external *bytes,
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arelent *cache_ptr,
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asymbol **symbols,
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bfd_size_type symcount ATTRIBUTE_UNUSED)
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{
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int r_index;
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int r_extern;
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unsigned int r_length;
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int r_pcrel;
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struct aoutdata *su = &(abfd->tdata.aout_data->a);
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cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
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r_index = bytes->r_index[1];
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r_extern = (0 != (bytes->r_index[0] & RELOC_STD_BITS_EXTERN_BIG));
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r_pcrel = (0 != (bytes->r_index[0] & RELOC_STD_BITS_PCREL_BIG));
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r_length = (bytes->r_index[0] & RELOC_STD_BITS_LENGTH_BIG)
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>> RELOC_STD_BITS_LENGTH_SH_BIG;
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cache_ptr->howto = aout_32_std_howto_table + r_length + 4 * r_pcrel;
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/* FIXME-soon: Roll baserel, jmptable, relative bits into howto setting */
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MOVE_ADDRESS (0);
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}
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/* Reloc hackery */
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static bfd_boolean
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NAME(lynx,slurp_reloc_table) (bfd *abfd,
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sec_ptr asect,
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asymbol **symbols)
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{
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bfd_size_type count;
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bfd_size_type reloc_size;
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void * relocs;
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arelent *reloc_cache;
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size_t each_size;
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if (asect->relocation)
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return TRUE;
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if (asect->flags & SEC_CONSTRUCTOR)
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return TRUE;
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if (asect == obj_datasec (abfd))
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{
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reloc_size = exec_hdr (abfd)->a_drsize;
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goto doit;
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}
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if (asect == obj_textsec (abfd))
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{
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reloc_size = exec_hdr (abfd)->a_trsize;
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goto doit;
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}
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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doit:
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if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
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return FALSE;
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each_size = obj_reloc_entry_size (abfd);
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count = reloc_size / each_size;
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reloc_cache = (arelent *) bfd_zmalloc (count * sizeof (arelent));
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if (!reloc_cache && count != 0)
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return FALSE;
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relocs = bfd_alloc (abfd, reloc_size);
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if (!relocs && reloc_size != 0)
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{
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free (reloc_cache);
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return FALSE;
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}
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if (bfd_bread (relocs, reloc_size, abfd) != reloc_size)
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{
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bfd_release (abfd, relocs);
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free (reloc_cache);
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return FALSE;
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}
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if (each_size == RELOC_EXT_SIZE)
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{
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struct reloc_ext_external *rptr = (struct reloc_ext_external *) relocs;
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unsigned int counter = 0;
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arelent *cache_ptr = reloc_cache;
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for (; counter < count; counter++, rptr++, cache_ptr++)
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{
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NAME(lynx,swap_ext_reloc_in) (abfd, rptr, cache_ptr, symbols,
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(bfd_size_type) bfd_get_symcount (abfd));
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}
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}
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else
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{
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struct reloc_std_external *rptr = (struct reloc_std_external *) relocs;
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unsigned int counter = 0;
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arelent *cache_ptr = reloc_cache;
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for (; counter < count; counter++, rptr++, cache_ptr++)
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{
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NAME(lynx,swap_std_reloc_in) (abfd, rptr, cache_ptr, symbols,
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(bfd_size_type) bfd_get_symcount (abfd));
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}
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}
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bfd_release (abfd, relocs);
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asect->relocation = reloc_cache;
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asect->reloc_count = count;
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return TRUE;
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}
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/* Write out a relocation section into an object file. */
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static bfd_boolean
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NAME(lynx,squirt_out_relocs) (bfd *abfd, asection *section)
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{
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arelent **generic;
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unsigned char *native, *natptr;
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size_t each_size;
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unsigned int count = section->reloc_count;
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bfd_size_type natsize;
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if (count == 0)
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return TRUE;
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each_size = obj_reloc_entry_size (abfd);
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natsize = count;
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natsize *= each_size;
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native = (unsigned char *) bfd_zalloc (abfd, natsize);
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if (!native)
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return FALSE;
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generic = section->orelocation;
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if (each_size == RELOC_EXT_SIZE)
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{
|
||
for (natptr = native;
|
||
count != 0;
|
||
--count, natptr += each_size, ++generic)
|
||
NAME(lynx,swap_ext_reloc_out) (abfd, *generic, (struct reloc_ext_external *) natptr);
|
||
}
|
||
else
|
||
{
|
||
for (natptr = native;
|
||
count != 0;
|
||
--count, natptr += each_size, ++generic)
|
||
NAME(lynx,swap_std_reloc_out) (abfd, *generic, (struct reloc_std_external *) natptr);
|
||
}
|
||
|
||
if (bfd_bwrite (native, natsize, abfd) != natsize)
|
||
{
|
||
bfd_release (abfd, native);
|
||
return FALSE;
|
||
}
|
||
bfd_release (abfd, native);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This is stupid. This function should be a boolean predicate */
|
||
static long
|
||
NAME(lynx,canonicalize_reloc) (bfd *abfd,
|
||
sec_ptr section,
|
||
arelent **relptr,
|
||
asymbol **symbols)
|
||
{
|
||
arelent *tblptr = section->relocation;
|
||
unsigned int count;
|
||
|
||
if (!(tblptr || NAME(lynx,slurp_reloc_table) (abfd, section, symbols)))
|
||
return -1;
|
||
|
||
if (section->flags & SEC_CONSTRUCTOR)
|
||
{
|
||
arelent_chain *chain = section->constructor_chain;
|
||
for (count = 0; count < section->reloc_count; count++)
|
||
{
|
||
*relptr++ = &chain->relent;
|
||
chain = chain->next;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
tblptr = section->relocation;
|
||
|
||
for (count = 0; count++ < section->reloc_count;)
|
||
{
|
||
*relptr++ = tblptr++;
|
||
}
|
||
}
|
||
*relptr = 0;
|
||
|
||
return section->reloc_count;
|
||
}
|
||
|
||
#define MY_canonicalize_reloc NAME(lynx,canonicalize_reloc)
|
||
|
||
#include "aout-target.h"
|