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