312 lines
12 KiB
C
312 lines
12 KiB
C
/* BFD back-end data structures for a.out (and similar) files.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Written by Cygnus Support.
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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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/* We try to encapsulate the differences in the various a.out file
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variants in a few routines, and otherwise share large masses of code.
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This means we only have to fix bugs in one place, most of the time. */
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#ifdef __STDC__
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#define CAT3(a,b,c) a##b##c
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#else
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#define CAT3(a,b,c) a/**/b/**/c
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#endif
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/* Parameterize the a.out code based on whether it is being built
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for a 32-bit architecture or a 64-bit architecture. */
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#if ARCH_SIZE==64
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#define GET_WORD bfd_h_get_64
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#define GET_SWORD (int64_type)GET_WORD
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#define PUT_WORD bfd_h_put_64
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#define NAME(x,y) CAT3(x,_64_,y)
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#define JNAME(x) CAT(x,_64)
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#define BYTES_IN_WORD 8
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#else
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#define GET_WORD bfd_h_get_32
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#define GET_SWORD (int32_type)GET_WORD
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#define PUT_WORD bfd_h_put_32
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#define NAME(x,y) CAT3(x,_32_,y)
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#define JNAME(x) CAT(x,_32)
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#define BYTES_IN_WORD 4
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#endif
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/* Declare these types at file level, since they are used in parameter
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lists, which have wierd scope. */
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struct external_exec;
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struct internal_exec;
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/* Back-end information for various a.out targets. */
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struct aout_backend_data
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{
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/* Are ZMAGIC files mapped contiguously? If so, the text section may
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need more padding, if the segment size (granularity for memory access
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control) is larger than the page size. */
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unsigned char zmagic_mapped_contiguous;
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/* If this flag is set, ZMAGIC/NMAGIC file headers get mapped in with the
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text section, which starts immediately after the file header.
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If not, the text section starts on the next page. */
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unsigned char text_includes_header;
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/* If the text section VMA isn't specified, and we need an absolute
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address, use this as the default. If we're producing a relocatable
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file, zero is always used. */
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/* ?? Perhaps a callback would be a better choice? Will this do anything
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reasonable for a format that handles multiple CPUs with different
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load addresses for each? */
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bfd_vma default_text_vma;
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/* Callback for setting the page and segment sizes, if they can't be
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trivially determined from the architecture. */
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boolean (*set_sizes) PARAMS ((bfd *));
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/* zmagic files only. For go32, the length of the exec header contributes
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to the size of the text section in the file for alignment purposes but
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does *not* get counted in the length of the text section. */
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unsigned char exec_header_not_counted;
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};
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#define aout_backend_info(abfd) \
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((CONST struct aout_backend_data *)((abfd)->xvec->backend_data))
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/* This is the layout in memory of a "struct exec" while we process it.
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All 'lengths' are given as a number of bytes.
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All 'alignments' are for relinkable files only; an alignment of
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'n' indicates the corresponding segment must begin at an
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address that is a multiple of (2**n). */
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struct internal_exec
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{
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long a_info; /* Magic number and flags, packed */
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bfd_vma a_text; /* length of text, in bytes */
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bfd_vma a_data; /* length of data, in bytes */
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bfd_vma a_bss; /* length of uninitialized data area in mem */
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bfd_vma a_syms; /* length of symbol table data in file */
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bfd_vma a_entry; /* start address */
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bfd_vma a_trsize; /* length of text's relocation info, in bytes */
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bfd_vma a_drsize; /* length of data's relocation info, in bytes */
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/* Added for i960 */
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bfd_vma a_tload; /* Text runtime load address */
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bfd_vma a_dload; /* Data runtime load address */
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unsigned char a_talign; /* Alignment of text segment */
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unsigned char a_dalign; /* Alignment of data segment */
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unsigned char a_balign; /* Alignment of bss segment */
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char a_relaxable; /* Enough info for linker relax */
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};
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/* Magic number is written
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< MSB >
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3130292827262524232221201918171615141312111009080706050403020100
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< FLAGS >< MACHINE TYPE >< MAGIC NUMBER >
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*/
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enum machine_type {
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M_UNKNOWN = 0,
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M_68010 = 1,
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M_68020 = 2,
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M_SPARC = 3,
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/* skip a bunch so we dont run into any of suns numbers */
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M_386 = 100,
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M_29K = 101,
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M_HP200 = 200, /* HP 200 (68010) BSD binary */
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M_HP300 = (300 % 256), /* HP 300 (68020+68881) BSD binary */
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M_HPUX = (0x20c % 256)/* HP 200/300 HPUX binary */
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};
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#define N_DYNAMIC(exec) ((exec).a_info & 0x8000000)
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#define N_MAGIC(exec) ((exec).a_info & 0xffff)
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#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
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#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
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#define N_SET_INFO(exec, magic, type, flags) \
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((exec).a_info = ((magic) & 0xffff) \
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| (((int)(type) & 0xff) << 16) \
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| (((flags) & 0xff) << 24))
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#define N_SET_MAGIC(exec, magic) \
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((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
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#define N_SET_MACHTYPE(exec, machtype) \
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((exec).a_info = \
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((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
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#define N_SET_FLAGS(exec, flags) \
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((exec).a_info = \
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((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
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typedef struct aout_symbol {
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asymbol symbol;
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short desc;
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char other;
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unsigned char type;
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} aout_symbol_type;
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/* The `tdata' struct for all a.out-like object file formats.
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Various things depend on this struct being around any time an a.out
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file is being handled. An example is dbxread.c in GDB. */
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struct aoutdata {
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struct internal_exec *hdr; /* exec file header */
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aout_symbol_type *symbols; /* symtab for input bfd */
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/* For ease, we do this */
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asection *textsec;
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asection *datasec;
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asection *bsssec;
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/* We remember these offsets so that after check_file_format, we have
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no dependencies on the particular format of the exec_hdr. */
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file_ptr sym_filepos;
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file_ptr str_filepos;
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/* Size of a relocation entry in external form */
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unsigned reloc_entry_size;
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/* Size of a symbol table entry in external form */
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unsigned symbol_entry_size;
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/* Page size - needed for alignment of demand paged files. */
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unsigned long page_size;
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/* Segment size - needed for alignment of demand paged files. */
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unsigned long segment_size;
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unsigned exec_bytes_size;
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unsigned vma_adjusted : 1;
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enum {
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undecided_magic = 0,
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z_magic,
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o_magic,
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n_magic } magic;
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};
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struct aout_data_struct {
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struct aoutdata a;
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struct internal_exec e;
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};
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#define adata(bfd) ((bfd)->tdata.aout_data->a)
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#define exec_hdr(bfd) (adata(bfd).hdr)
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#define obj_aout_symbols(bfd) (adata(bfd).symbols)
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#define obj_textsec(bfd) (adata(bfd).textsec)
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#define obj_datasec(bfd) (adata(bfd).datasec)
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#define obj_bsssec(bfd) (adata(bfd).bsssec)
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#define obj_sym_filepos(bfd) (adata(bfd).sym_filepos)
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#define obj_str_filepos(bfd) (adata(bfd).str_filepos)
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#define obj_reloc_entry_size(bfd) (adata(bfd).reloc_entry_size)
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#define obj_symbol_entry_size(bfd) (adata(bfd).symbol_entry_size)
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/* We take the address of the first element of an asymbol to ensure that the
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macro is only ever applied to an asymbol */
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#define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd))
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/* Prototype declarations for functions defined in aoutx.h */
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PROTO (boolean, NAME(aout,squirt_out_relocs),(bfd *abfd, asection *section));
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PROTO (bfd_target *, NAME(aout,some_aout_object_p), (bfd *abfd,
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struct internal_exec *execp,
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bfd_target *(*callback)()));
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PROTO (boolean, NAME(aout,mkobject), (bfd *abfd));
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PROTO (enum machine_type, NAME(aout,machine_type), (enum bfd_architecture arch,
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unsigned long machine));
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PROTO (boolean, NAME(aout,set_arch_mach), (bfd *abfd, enum bfd_architecture arch,
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unsigned long machine));
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PROTO (boolean, NAME(aout,new_section_hook), (bfd *abfd, asection *newsect));
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PROTO (boolean, NAME(aout,set_section_contents), (bfd *abfd, sec_ptr section,
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PTR location, file_ptr offset, bfd_size_type count));
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PROTO (asymbol *,NAME(aout,make_empty_symbol), (bfd *abfd));
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PROTO (boolean, NAME(aout,slurp_symbol_table), (bfd *abfd));
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PROTO (void, NAME(aout,write_syms), (bfd *abfd));
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PROTO (void, NAME(aout,reclaim_symbol_table), (bfd *abfd));
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PROTO (unsigned int, NAME(aout,get_symtab_upper_bound), (bfd *abfd));
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PROTO (unsigned int, NAME(aout,get_symtab), (bfd *abfd, asymbol **location));
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PROTO (boolean, NAME(aout,slurp_reloc_table), (bfd *abfd, sec_ptr asect,
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asymbol **symbols));
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PROTO (unsigned int, NAME(aout,canonicalize_reloc), (bfd *abfd, sec_ptr section,
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arelent **relptr, asymbol **symbols));
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PROTO (unsigned int, NAME(aout,get_reloc_upper_bound), (bfd *abfd, sec_ptr asect));
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PROTO (void, NAME(aout,reclaim_reloc), (bfd *ignore_abfd, sec_ptr ignore));
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PROTO (alent *, NAME(aout,get_lineno), (bfd *ignore_abfd, asymbol *ignore_symbol));
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PROTO (void, NAME(aout,print_symbol), (bfd *ignore_abfd, PTR file,
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asymbol *symbol, bfd_print_symbol_type how));
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PROTO (boolean, NAME(aout,close_and_cleanup), (bfd *abfd));
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PROTO (boolean, NAME(aout,find_nearest_line), (bfd *abfd, asection *section,
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asymbol **symbols, bfd_vma offset, CONST char **filename_ptr,
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CONST char **functionname_ptr, unsigned int *line_ptr));
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PROTO (int, NAME(aout,sizeof_headers), (bfd *abfd, boolean exec));
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PROTO (void, NAME(aout,swap_exec_header_in), (bfd *abfd,
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struct external_exec *raw_bytes, struct internal_exec *execp));
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PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *execp,
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struct external_exec *raw_bytes));
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/* Prototypes for functions in stab-syms.c. */
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PROTO(char *, aout_stab_name, (int code));
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/* A.out uses the generic versions of these routines... */
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#define aout_32_get_section_contents bfd_generic_get_section_contents
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#define aout_32_close_and_cleanup bfd_generic_close_and_cleanup
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#define aout_64_get_section_contents bfd_generic_get_section_contents
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#define aout_64_close_and_cleanup bfd_generic_close_and_cleanup
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#ifndef NO_WRITE_HEADER_KLUDGE
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#define NO_WRITE_HEADER_KLUDGE 0
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#endif
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#ifndef WRITE_HEADERS
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#define WRITE_HEADERS(abfd, execp) \
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{ \
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bfd_size_type text_size; /* dummy vars */ \
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file_ptr text_end; \
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if (adata(abfd).magic == undecided_magic) \
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NAME(aout,adjust_sizes_and_vmas) (abfd, &text_size, &text_end); \
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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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bfd_seek (abfd, (file_ptr) 0, SEEK_SET); \
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bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd); \
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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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bfd_seek (abfd, (file_ptr)(N_SYMOFF(*execp)), SEEK_SET); \
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\
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NAME(aout,write_syms)(abfd); \
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\
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bfd_seek (abfd, (file_ptr)(N_TRELOFF(*execp)), SEEK_SET); \
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\
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if (!NAME(aout,squirt_out_relocs) (abfd, obj_textsec (abfd))) return false; \
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bfd_seek (abfd, (file_ptr)(N_DRELOFF(*execp)), SEEK_SET); \
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\
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if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd))) return false; \
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} \
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}
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#endif
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