/* $OpenBSD: obj-bout.h,v 1.3 1998/02/28 00:52:07 niklas Exp $ */ /* b.out object file format Copyright (C) 1989, 1990, 1991, 1992 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, 675 Mass Ave, 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. * * 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 #include "targ-cpu.h" /* bout uses host byte order for headers */ #ifdef CROSS_COMPILE #undef CROSS_COMPILE #endif /* CROSS_COMPILE */ /* We want \v. */ #define BACKSLASH_V 1 #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 */ /* 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 unused; /* (Just to make struct size a multiple of 4) */ }; #define N_BADMAG(x) (((x).a_magic) != BMAGIC) #define N_TXTOFF(x) ( sizeof(struct exec) ) #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 syntaxic 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)) #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 */ /* A symbol name whose name begin with ^A is a gas internal pseudo symbol nameless symbols come from .stab directives. */ #define S_IS_LOCAL(s) (S_GET_NAME(s) && \ !S_IS_DEBUG(s) && \ (S_GET_NAME(s)[0] == '\001' || \ (S_LOCAL_NAME(s) && !flagseen['L']))) /* True if a symbol is not defined in this file */ #define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT) /* 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)) /* File header macro and type definition */ #define H_GET_FILE_SIZE(h) (sizeof(struct exec) + \ 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) (sizeof(struct exec)) #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) * \ sizeof(struct nlist)) #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 */ /* * Current means for getting the name of a segment. * This will change for infinite-segments support (e.g. COFF). */ #define segment_name(seg) ( seg_name[(int)(seg)] ) extern char *const seg_name[]; 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) {;} #if __STDC__ struct fix; void tc_aout_fix_to_chars(char *where, struct fix *fixP, relax_addressT segment_address); #else /* not __STDC__ */ void tc_aout_fix_to_chars(); #endif /* not __STDC__ */ enum reloc_type { NO_RELOC, RELOC_32, }; /* * Local Variables: * comment-column: 0 * fill-column: 131 * End: */ /* end of obj-bout.h */