291 lines
9.5 KiB
C
291 lines
9.5 KiB
C
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/* BFD backend for CRIS a.out binaries.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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Contributed by Axis Communications AB.
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Written by Hans-Peter Nilsson.
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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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/* See info in the file PORTING for documentation of these macros and
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functions. Beware; some of the information there is outdated. */
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#define N_HEADER_IN_TEXT(x) 0
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#define N_TXTOFF(x) 32
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#define ENTRY_CAN_BE_ZERO
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#define TEXT_START_ADDR 0
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/* Without reading symbols to get the text start symbol, there is no way
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to know where the text segment starts in an a.out file. Defaulting to
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anything as constant as TEXT_START_ADDR is bad. But we can guess from
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the entry point, which is usually within the first 64k of the text
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segment. We also assume here that the text segment is 64k-aligned.
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FIXME: It is also wrong to assume that data and bss follow immediately
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after text, but with those, we don't have any choice besides reading
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symbol info, and luckily there's no pressing need for correctness for
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those vma:s at this time. */
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#define N_TXTADDR(x) ((x)->a_entry & ~(bfd_vma) 0xffff)
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/* If you change this to 4, you can not link to an address N*4+2. */
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#define SEGMENT_SIZE 2
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/* For some reason, if the a.out file has Z_MAGIC, then
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adata(abfd).exec_bytes_size is not used, but rather
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adata(abfd).zmagic_disk_block_size, even though the exec_header is
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*not* included in the text segment. A simple workaround is to
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#define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise
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TARGET_PAGE_SIZE is used. */
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#define ZMAGIC_DISK_BLOCK_SIZE N_TXTOFF (0)
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/* It seems odd at first to set a page-size this low, but gives greater
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freedom in where things can be linked. The drawback is that you have
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to set alignment and padding in linker scripts. */
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#define TARGET_PAGE_SIZE SEGMENT_SIZE
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#define TARGETNAME "a.out-cris"
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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 (cris_aout_,OP)
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#define NAME(x, y) CONCAT3 (cris_aout,_32_,y)
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#include "sysdep.h"
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#include "bfd.h"
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/* Version 1 of the header. */
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#define MY_exec_hdr_flags 1
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#define MY_write_object_contents MY (write_object_contents)
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static bool MY (write_object_contents) (bfd *);
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/* Forward this, so we can use a pointer to it in PARAMS. */
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struct reloc_ext_external;
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#define MY_swap_ext_reloc_out MY (swap_ext_reloc_out)
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static void MY (swap_ext_reloc_out) (bfd *, arelent *, struct reloc_ext_external *);
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#define MY_swap_ext_reloc_in MY (swap_ext_reloc_in)
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static void MY (swap_ext_reloc_in) (bfd *, struct reloc_ext_external *,
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arelent *, asymbol **, bfd_size_type);
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#define MY_set_sizes MY (set_sizes)
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static bool MY (set_sizes) (bfd *);
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/* To set back reloc_size to ext, we make MY (set_sizes) be called
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through this construct. Note that MY_set_arch_mach is only called
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through SET_ARCH_MACH. The default bfd_default_set_arch_mach will
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not call set_sizes. */
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#define SET_ARCH_MACH(BFD, EXECP) \
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bfd_set_arch_mach (BFD, bfd_arch_cris, N_MACHTYPE (EXECP))
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/* These macros describe the binary layout of the reloc information we
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use in a file. */
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#define RELOC_EXT_BITS_EXTERN_LITTLE 0x80
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#define RELOC_EXT_BITS_TYPE_LITTLE 3
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#define RELOC_EXT_BITS_TYPE_SH_LITTLE 0
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#ifndef MY_get_section_contents
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#define MY_get_section_contents aout_32_get_section_contents
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#endif
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#define MACHTYPE_OK(mtype) ((mtype) == M_CRIS)
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/* Include generic functions (some are overridden above). */
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#include "aout32.c"
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#include "aout-target.h"
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/* We need our own version to set header flags. */
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static bool
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MY (write_object_contents) (bfd *abfd)
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{
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struct external_exec exec_bytes;
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struct internal_exec *execp = exec_hdr (abfd);
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/* We set the reloc type to RELOC_EXT_SIZE, although setting it at all
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seems unnecessary when inspecting as and ld behavior (not an
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exhaustive inspection). The default write_object_contents
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definition sets RELOC_EXT_SIZE, so we follow suite and set it too. */
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obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
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/* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by
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the default definition. */
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if (bfd_get_arch (abfd) == bfd_arch_cris)
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N_SET_MACHTYPE (execp, M_CRIS);
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N_SET_FLAGS (execp, aout_backend_info (abfd)->exec_hdr_flags);
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WRITE_HEADERS (abfd, execp);
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return true;
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}
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/* We need our own for these reasons:
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- Assert that a normal 8, 16 or 32 reloc is output.
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- Fix what seems to be a weak-bug (perhaps there for valid reasons). */
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static void
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MY (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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bfd_vma 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;
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if ((sym->flags & BSF_SECTION_SYM) != 0)
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r_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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if (bfd_is_abs_section (bfd_asymbol_section (sym)))
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{
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r_extern = 0;
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r_index = N_ABS;
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}
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else if ((sym->flags & BSF_SECTION_SYM) == 0)
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{
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if (bfd_is_und_section (bfd_asymbol_section (sym))
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/* Remember to check for weak symbols; they count as global. */
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|| (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0)
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r_extern = 1;
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else
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r_extern = 0;
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r_index = (*(g->sym_ptr_ptr))->KEEPIT;
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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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/* The relocation type is the same as the canonical ones, but only
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the first 3 are used: RELOC_8, RELOC_16, RELOC_32.
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We may change this later, but assert this for the moment. */
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if (r_type > 2)
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: unsupported relocation type exported: %#x"),
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abfd, r_type);
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bfd_set_error (bfd_error_wrong_format);
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}
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/* Now the fun stuff. */
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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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PUT_WORD (abfd, r_addend, natptr->r_addend);
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}
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/* We need our own to assert that a normal 8, 16 or 32 reloc is input. */
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static void
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MY (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)
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{
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unsigned 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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/* Now the fun stuff. */
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r_index = (((unsigned int) bytes->r_index[2] << 16)
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| ((unsigned int) bytes->r_index[1] << 8)
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| bytes->r_index[0]);
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r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE));
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r_type = ((bytes->r_type[0] & RELOC_EXT_BITS_TYPE_LITTLE)
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>> RELOC_EXT_BITS_TYPE_SH_LITTLE);
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if (r_type > 2)
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: unsupported relocation type imported: %#x"),
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abfd, r_type);
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bfd_set_error (bfd_error_wrong_format);
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}
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cache_ptr->howto = howto_table_ext + r_type;
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if (r_extern && r_index > symcount)
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{
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_bfd_error_handler
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/* xgettext:c-format */
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(_("%pB: bad relocation record imported: %d"), abfd, r_index);
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bfd_set_error (bfd_error_wrong_format);
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/* We continue, so we can catch further errors. */
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r_extern = 0;
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r_index = N_ABS;
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}
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/* Magically uses r_extern, symbols etc. Ugly, but it's what's in the
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default. */
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MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
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}
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/* We use the same as the default, except that we also set
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"obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing
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NAME (aout, set_arch_mach) in aoutx. */
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static bool
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MY (set_sizes) (bfd *abfd)
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{
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/* Just as the default in aout-target.h (with some #ifdefs folded)... */
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adata (abfd).page_size = TARGET_PAGE_SIZE;
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adata (abfd).segment_size = SEGMENT_SIZE;
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adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE;
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adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;
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/* ... except for that we have the extended reloc. The alternative
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would be to add a check on bfd_arch_cris in NAME (aout,
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set_arch_mach) in aoutx.h, but I don't want to do that since
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target-specific things should not be added there. */
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obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
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return true;
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}
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