diff options
Diffstat (limited to 'binutils-2.25/bfd/aout-cris.c')
| -rw-r--r-- | binutils-2.25/bfd/aout-cris.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/aout-cris.c b/binutils-2.25/bfd/aout-cris.c new file mode 100644 index 00000000..3e3d21ad --- /dev/null +++ b/binutils-2.25/bfd/aout-cris.c @@ -0,0 +1,290 @@ +/* BFD backend for CRIS a.out binaries. + Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009, 2012 + Free Software Foundation, Inc. + Contributed by Axis Communications AB. + Written by Hans-Peter Nilsson. + + 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. */ + +/* See info in the file PORTING for documentation of these macros and + functions. Beware; some of the information there is outdated. */ + +#define N_HEADER_IN_TEXT(x) 0 +#define N_TXTOFF(x) 32 +#define ENTRY_CAN_BE_ZERO +#define TEXT_START_ADDR 0 + +/* Without reading symbols to get the text start symbol, there is no way + to know where the text segment starts in an a.out file. Defaulting to + anything as constant as TEXT_START_ADDR is bad. But we can guess from + the entry point, which is usually within the first 64k of the text + segment. We also assume here that the text segment is 64k-aligned. + FIXME: It is also wrong to assume that data and bss follow immediately + after text, but with those, we don't have any choice besides reading + symbol info, and luckily there's no pressing need for correctness for + those vma:s at this time. */ +#define N_TXTADDR(x) ((x).a_entry & ~(bfd_vma) 0xffff) + +/* If you change this to 4, you can not link to an address N*4+2. */ +#define SEGMENT_SIZE 2 + +/* For some reason, if the a.out file has Z_MAGIC, then + adata(abfd).exec_bytes_size is not used, but rather + adata(abfd).zmagic_disk_block_size, even though the exec_header is + *not* included in the text segment. A simple workaround is to + #define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise + TARGET_PAGE_SIZE is used. */ +#define ZMAGIC_DISK_BLOCK_SIZE N_TXTOFF (0) + +/* It seems odd at first to set a page-size this low, but gives greater + freedom in where things can be linked. The drawback is that you have + to set alignment and padding in linker scripts. */ +#define TARGET_PAGE_SIZE SEGMENT_SIZE +#define TARGETNAME "a.out-cris" + +/* The definition here seems not used; just provided as a convention. */ +#define DEFAULT_ARCH bfd_arch_cris + +/* 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 (cris_aout_,OP) +#define NAME(x, y) CONCAT3 (cris_aout,_32_,y) + +#include "sysdep.h" +#include "bfd.h" + +/* Version 1 of the header. */ +#define MY_exec_hdr_flags 1 + +#define MY_write_object_contents MY (write_object_contents) +static bfd_boolean MY (write_object_contents) (bfd *); + +/* Forward this, so we can use a pointer to it in PARAMS. */ +struct reloc_ext_external; + +#define MY_swap_ext_reloc_out MY (swap_ext_reloc_out) +static void MY (swap_ext_reloc_out) (bfd *, arelent *, struct reloc_ext_external *); + +#define MY_swap_ext_reloc_in MY (swap_ext_reloc_in) +static void MY (swap_ext_reloc_in) (bfd *, struct reloc_ext_external *, + arelent *, asymbol **, bfd_size_type); + +#define MY_set_sizes MY (set_sizes) +static bfd_boolean MY (set_sizes) (bfd *); + +/* To set back reloc_size to ext, we make MY (set_sizes) be called + through this construct. Note that MY_set_arch_mach is only called + through SET_ARCH_MACH. The default bfd_default_set_arch_mach will + not call set_sizes. */ + +#define MY_set_arch_mach NAME (aout, set_arch_mach) +#define SET_ARCH_MACH(BFD, EXEC) \ + MY_set_arch_mach (BFD, DEFAULT_ARCH, N_MACHTYPE (EXEC)) + +/* These macros describe the binary layout of the reloc information we + use in a file. */ +#define RELOC_EXT_BITS_EXTERN_LITTLE 0x80 +#define RELOC_EXT_BITS_TYPE_LITTLE 3 +#define RELOC_EXT_BITS_TYPE_SH_LITTLE 0 + +#ifndef MY_get_section_contents +#define MY_get_section_contents aout_32_get_section_contents +#endif + +#define MACHTYPE_OK(mtype) ((mtype) == M_CRIS) + +/* Include generic functions (some are overridden above). */ +#include "aout32.c" +#include "aout-target.h" + +/* We need our own version to set header flags. */ + +static bfd_boolean +MY (write_object_contents) (bfd *abfd) +{ + struct external_exec exec_bytes; + struct internal_exec *execp = exec_hdr (abfd); + + /* We set the reloc type to RELOC_EXT_SIZE, although setting it at all + seems unnecessary when inspecting as and ld behavior (not an + exhaustive inspection). The default write_object_contents + definition sets RELOC_EXT_SIZE, so we follow suite and set it too. */ + obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; + + /* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by + the default definition. */ + if (bfd_get_arch (abfd) == bfd_arch_cris) + N_SET_MACHTYPE (*execp, M_CRIS); + + N_SET_FLAGS (*execp, aout_backend_info (abfd)->exec_hdr_flags); + + WRITE_HEADERS (abfd, execp); + + return TRUE; +} + +/* We need our own for these reasons: + - Assert that a normal 8, 16 or 32 reloc is output. + - Fix what seems to be a weak-bug (perhaps there for valid reasons). */ + +static void +MY (swap_ext_reloc_out) (bfd *abfd, + arelent *g, + struct reloc_ext_external *natptr) +{ + int r_index; + int r_extern; + unsigned int r_type; + bfd_vma 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; + if ((sym->flags & BSF_SECTION_SYM) != 0) + r_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_abs_section (bfd_get_section (sym))) + { + r_extern = 0; + r_index = N_ABS; + } + else if ((sym->flags & BSF_SECTION_SYM) == 0) + { + if (bfd_is_und_section (bfd_get_section (sym)) + /* Remember to check for weak symbols; they count as global. */ + || (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0) + r_extern = 1; + else + r_extern = 0; + r_index = (*(g->sym_ptr_ptr))->KEEPIT; + } + else + { + /* Just an ordinary section. */ + r_extern = 0; + r_index = output_section->target_index; + } + + /* The relocation type is the same as the canonical ones, but only + the first 3 are used: RELOC_8, RELOC_16, RELOC_32. + We may change this later, but assert this for the moment. */ + if (r_type > 2) + { + (*_bfd_error_handler) (_("%s: Invalid relocation type exported: %d"), + bfd_get_filename (abfd), r_type); + + bfd_set_error (bfd_error_wrong_format); + } + + /* Now the fun stuff. */ + 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); +} + +/* We need our own to assert that a normal 8, 16 or 32 reloc is input. */ + +static void +MY (swap_ext_reloc_in) (bfd *abfd, + struct reloc_ext_external *bytes, + arelent *cache_ptr, + asymbol **symbols, + bfd_size_type symcount) +{ + unsigned 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)); + + /* Now the fun stuff. */ + r_index = (bytes->r_index[2] << 16) + | (bytes->r_index[1] << 8) + | bytes->r_index[0]; + r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE)); + r_type = ((bytes->r_type[0]) >> RELOC_EXT_BITS_TYPE_SH_LITTLE) + & RELOC_EXT_BITS_TYPE_LITTLE; + + if (r_type > 2) + { + (*_bfd_error_handler) (_("%B: Invalid relocation type imported: %d"), + abfd, r_type); + + bfd_set_error (bfd_error_wrong_format); + } + + cache_ptr->howto = howto_table_ext + r_type; + + if (r_extern && r_index > symcount) + { + (*_bfd_error_handler) + (_("%B: Bad relocation record imported: %d"), abfd, r_index); + + bfd_set_error (bfd_error_wrong_format); + + /* We continue, so we can catch further errors. */ + r_extern = 0; + r_index = N_ABS; + } + + /* Magically uses r_extern, symbols etc. Ugly, but it's what's in the + default. */ + MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend)); +} + +/* We use the same as the default, except that we also set + "obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing + NAME (aout, set_arch_mach) in aoutx. */ + +static bfd_boolean +MY (set_sizes) (bfd *abfd) +{ + /* Just as the default in aout-target.h (with some #ifdefs folded)... */ + + adata (abfd).page_size = TARGET_PAGE_SIZE; + adata (abfd).segment_size = SEGMENT_SIZE; + adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE; + adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE; + + /* ... except for that we have the extended reloc. The alternative + would be to add a check on bfd_arch_cris in NAME (aout, + set_arch_mach) in aoutx.h, but I don't want to do that since + target-specific things should not be added there. */ + + obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; + + return TRUE; +} |