| /* b.out object file format |
| Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000, |
| 2002, 2003, 2005 Free Software Foundation, Inc. |
| |
| This file is part of GAS, the GNU Assembler. |
| |
| GAS 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 2, |
| or (at your option) any later version. |
| |
| GAS 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 GAS; see the file COPYING. If not, write |
| to the Free Software Foundation, 51 Franklin Street - Fifth Floor, Cambridge, MA |
| 02139, USA. */ |
| |
| /* This file is a modified version of 'a.out.h'. It is to be used in all GNU |
| tools modified to support the i80960 b.out format (or tools that operate on |
| object files created by such tools). |
| |
| All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e., |
| object code is generated on, and executed under the direction of a symbolic |
| debugger running on, a host system. We do not want to be subject to the |
| vagaries of which host it is or whether it supports COFF or a.out format, or |
| anything else. We DO want to: |
| |
| o always generate the same format object files, regardless of host. |
| |
| o have an 'a.out' header that we can modify for our own purposes |
| (the 80960 is typically an embedded processor and may require |
| enhanced linker support that the normal a.out.h header can't |
| accommodate). |
| |
| As for byte-ordering, the following rules apply: |
| |
| o Text and data that is actually downloaded to the target is always |
| in i80960 (little-endian) order. |
| |
| o All other numbers (in the header, symbols, relocation directives) |
| are in host byte-order: object files CANNOT be lifted from a |
| little-end host and used on a big-endian (or vice versa) without |
| modification. |
| ==> This is no longer true using BFD. We can generate any byte order |
| for the header, and read any byte order. Preference would be to |
| use little-endian byte order throughout, regardless of host. <== |
| |
| o The downloader ('comm960') takes care to generate a pseudo-header |
| with correct (i80960) byte-ordering before shipping text and data |
| off to the NINDY monitor in the target systems. Symbols and |
| relocation info are never sent to the target. */ |
| |
| #define OBJ_BOUT 1 |
| |
| #define OUTPUT_FLAVOR bfd_target_aout_flavour |
| |
| #include "targ-cpu.h" |
| |
| #define OBJ_DEFAULT_OUTPUT_FILE_NAME "b.out" |
| |
| extern const short seg_N_TYPE[]; |
| extern const segT N_TYPE_seg[]; |
| |
| #define BMAGIC 0415 |
| /* We don't accept the following (see N_BADMAG macro). |
| They're just here so GNU code will compile. */ |
| #define OMAGIC 0407 /* Old impure format. */ |
| #define NMAGIC 0410 /* Read-only text. */ |
| #define ZMAGIC 0413 /* Demand load format. */ |
| |
| #ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE |
| #define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE BMAGIC |
| #endif |
| |
| /* File header: |
| All 'lengths' are given as a number of bytes. |
| All 'alignments' are for relinkable files only; an alignment of |
| 'n' indicates the corresponding segment must begin at an |
| address that is a multiple of (2**n). */ |
| struct exec |
| { |
| /* Standard stuff. */ |
| unsigned long a_magic; /* Identifies this as a b.out file. */ |
| unsigned long a_text; /* Length of text. */ |
| unsigned long a_data; /* Length of data. */ |
| unsigned long a_bss; /* Length of runtime uninitialized data area. */ |
| unsigned long a_syms; /* Length of symbol table. */ |
| unsigned long a_entry; /* Runtime start address. */ |
| unsigned long a_trsize; /* Length of text relocation info. */ |
| unsigned long a_drsize; /* Length of data relocation info. */ |
| |
| /* Added for i960 */ |
| unsigned long a_tload; /* Text runtime load address. */ |
| unsigned long a_dload; /* Data runtime load address. */ |
| unsigned char a_talign; /* Alignment of text segment. */ |
| unsigned char a_dalign; /* Alignment of data segment. */ |
| unsigned char a_balign; /* Alignment of bss segment. */ |
| unsigned char a_relaxable; /* Contains enough info to relax. */ |
| }; |
| |
| #define EXEC_BYTES_SIZE (10 * 4 + 4 * 1) |
| |
| #define N_BADMAG(x) (((x).a_magic) != BMAGIC) |
| #define N_TXTOFF(x) EXEC_BYTES_SIZE |
| #define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text ) |
| #define N_TROFF(x) ( N_DATOFF(x) + (x).a_data ) |
| #define N_DROFF(x) ( N_TROFF(x) + (x).a_trsize ) |
| #define N_SYMOFF(x) ( N_DROFF(x) + (x).a_drsize ) |
| #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms ) |
| |
| /* A single entry in the symbol table. */ |
| struct nlist |
| { |
| union |
| { |
| char *n_name; |
| struct nlist *n_next; |
| long n_strx; /* Index into string table. */ |
| } |
| n_un; |
| unsigned char n_type; /* See below. */ |
| char n_other; /* Used in i80960 support -- see below. */ |
| short n_desc; |
| unsigned long n_value; |
| }; |
| |
| typedef struct nlist obj_symbol_type; |
| |
| /* Legal values of n_type. */ |
| #define N_UNDF 0 /* Undefined symbol. */ |
| #define N_ABS 2 /* Absolute symbol. */ |
| #define N_TEXT 4 /* Text symbol. */ |
| #define N_DATA 6 /* Data symbol. */ |
| #define N_BSS 8 /* BSS symbol. */ |
| #define N_FN 31 /* Filename symbol. */ |
| |
| #define N_EXT 1 /* External symbol (OR'd in with one of above). */ |
| #define N_TYPE 036 /* Mask for all the type bits. */ |
| #define N_STAB 0340 /* Mask for all bits used for SDB entries. */ |
| |
| #ifndef CUSTOM_RELOC_FORMAT |
| struct relocation_info |
| { |
| int r_address; /* File address of item to be relocated. */ |
| unsigned |
| r_index:24, /* Index of symbol on which relocation is based. */ |
| r_pcrel:1, /* 1 => relocate PC-relative; else absolute |
| On i960, pc-relative implies 24-bit |
| address, absolute implies 32-bit. */ |
| r_length:2, /* Number of bytes to relocate: |
| 0 => 1 byte |
| 1 => 2 bytes |
| 2 => 4 bytes -- only value used for i960. */ |
| r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler. */ |
| r_disp:1, /* Something for the GNU NS32K assembler. */ |
| r_callj:1, /* 1 if relocation target is an i960 'callj'. */ |
| nuthin:1; /* Unused. */ |
| }; |
| |
| #endif /* CUSTOM_RELOC_FORMAT */ |
| |
| /* Macros to extract information from a symbol table entry. |
| This syntactic indirection allows independence regarding a.out or coff. |
| The argument (s) of all these macros is a pointer to a symbol table entry. */ |
| |
| /* Predicates. */ |
| /* True if the symbol is external. */ |
| #define S_IS_EXTERNAL(s) ((s)->sy_symbol.n_type & N_EXT) |
| |
| /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT. */ |
| #define S_IS_DEFINED(s) ((S_GET_TYPE(s) != N_UNDF) || (S_GET_DESC(s) != 0)) |
| |
| /* Return true for symbols that should not be reduced to section |
| symbols or eliminated from expressions, because they may be |
| overridden by the linker. */ |
| #define S_FORCE_RELOC(s, strict) \ |
| (!SEG_NORMAL (S_GET_SEGMENT (s))) |
| |
| #define S_IS_COMMON(s) \ |
| (S_GET_TYPE (s) == N_UNDF && S_GET_VALUE (s) != 0) |
| |
| #define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER) |
| |
| /* True if a debug special symbol entry. */ |
| #define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB) |
| /* True if a symbol is local symbol name. */ |
| #define S_IS_LOCAL(s) \ |
| ((S_GET_NAME (s) \ |
| && !S_IS_DEBUG (s) \ |
| && (strchr (S_GET_NAME (s), '\001') != NULL \ |
| || strchr (S_GET_NAME (s), '\002') != NULL \ |
| || (S_LOCAL_NAME(s) && !flag_keep_locals))) \ |
| || (flag_strip_local_absolute \ |
| && !S_IS_EXTERNAL(s) \ |
| && S_GET_SEGMENT(s) == absolute_section)) |
| /* True if the symbol has been generated because of a .stabd directive. */ |
| #define S_IS_STABD(s) (S_GET_NAME(s) == NULL) |
| |
| /* Accessors. */ |
| /* The name of the symbol. */ |
| #define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name) |
| /* The pointer to the string table. */ |
| #define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx) |
| /* The type of the symbol. */ |
| #define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE) |
| /* The numeric value of the segment. */ |
| #define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)]) |
| /* The n_other expression value. */ |
| #define S_GET_OTHER(s) ((s)->sy_symbol.n_other) |
| /* The n_desc expression value. */ |
| #define S_GET_DESC(s) ((s)->sy_symbol.n_desc) |
| |
| /* Modifiers. */ |
| /* Assume that a symbol cannot be simultaneously in more than on segment. */ |
| /* Set segment. */ |
| #define S_SET_SEGMENT(s,seg) ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type |= SEGMENT_TO_SYMBOL_TYPE (seg)) |
| /* The symbol is external. */ |
| #define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT) |
| /* The symbol is not external. */ |
| #define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT) |
| /* Set the name of the symbol. */ |
| #define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v)) |
| /* Set the offset in the string table. */ |
| #define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v)) |
| /* Set the n_other expression value. */ |
| #define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v)) |
| /* Set the n_desc expression value. */ |
| #define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v)) |
| /* Set the n_type value. */ |
| #define S_SET_TYPE(s,v) ((s)->sy_symbol.n_type = (v)) |
| |
| /* File header macro and type definition. */ |
| |
| #define H_GET_FILE_SIZE(h) (EXEC_BYTES_SIZE \ |
| + H_GET_TEXT_SIZE (h) \ |
| + H_GET_DATA_SIZE(h) \ |
| + H_GET_SYMBOL_TABLE_SIZE (h) \ |
| + H_GET_TEXT_RELOCATION_SIZE (h) \ |
| + H_GET_DATA_RELOCATION_SIZE (h) \ |
| + (h)->string_table_size) |
| |
| #define H_GET_HEADER_SIZE(h) EXEC_BYTES_SIZE |
| #define H_GET_TEXT_SIZE(h) ((h)->header.a_text) |
| #define H_GET_DATA_SIZE(h) ((h)->header.a_data) |
| #define H_GET_BSS_SIZE(h) ((h)->header.a_bss) |
| #define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize) |
| #define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize) |
| #define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms) |
| #define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info) |
| #define H_GET_ENTRY_POINT(h) ((h)->header.a_entry) |
| #define H_GET_STRING_SIZE(h) ((h)->string_table_size) |
| #define H_GET_LINENO_SIZE(h) (0) |
| |
| #ifdef EXEC_MACHINE_TYPE |
| #define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype) |
| #endif /* EXEC_MACHINE_TYPE. */ |
| #ifdef EXEC_VERSION |
| #define H_GET_VERSION(h) ((h)->header.a_version) |
| #endif /* EXEC_VERSION. */ |
| |
| #define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = (v)) |
| #define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = (v)) |
| #define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = (v)) |
| |
| #define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\ |
| H_SET_DATA_RELOCATION_SIZE((h),(d))) |
| |
| #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v)) |
| #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v)) |
| #define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * 12) |
| |
| #define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_magic = (v)) |
| |
| #define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v)) |
| #define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v)) |
| #ifdef EXEC_MACHINE_TYPE |
| #define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v)) |
| #endif /* EXEC_MACHINE_TYPE. */ |
| #ifdef EXEC_VERSION |
| #define H_SET_VERSION(h,v) ((h)->header.a_version = (v)) |
| #endif /* EXEC_VERSION. */ |
| |
| typedef struct |
| { |
| struct exec header; /* a.out header. */ |
| long string_table_size; /* names + '\0' + sizeof (int). */ |
| } |
| |
| object_headers; |
| |
| /* Unused hooks. */ |
| #define OBJ_EMIT_LINENO(a, b, c) {;} |
| #define obj_pre_write_hook(a) {;} |
| |
| #if WORDS_BIGENDIAN |
| #define host_number_to_chars number_to_chars_bigendian |
| #else |
| #define host_number_to_chars number_to_chars_littleendian |
| #endif |
| |
| struct fix; |
| |
| extern void tc_aout_fix_to_chars (char *, struct fix *, relax_addressT); |
| extern void tc_bout_fix_to_chars (char *, struct fix *, relax_addressT); |
| |
| #define AOUT_STABS |