456 lines
13 KiB
C
456 lines
13 KiB
C
/* This file is aout_gnu.h
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Copyright (C) 1987-1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS 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, or (at your option)
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any later version.
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GAS 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 GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef __A_OUT_GNU_H__
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#define __A_OUT_GNU_H__
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/* There are two main flavours of a.out, one which uses the standard
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relocations, and one which uses extended relocations.
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Today, the extended reloc uses are
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TC_SPARC, TC_A29K
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each must define the enum reloc_type
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*/
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#define USE_EXTENDED_RELOC (defined(TC_SPARC) || defined(TC_A29K))
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#if defined(TC_SPARC) || defined(TC_A29K)
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enum reloc_type
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{
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RELOC_8, RELOC_16, RELOC_32,/* simple relocations */
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RELOC_DISP8, RELOC_DISP16, RELOC_DISP32, /* pc-rel displacement */
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RELOC_WDISP30, RELOC_WDISP22,
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RELOC_HI22, RELOC_22,
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RELOC_13, RELOC_LO10,
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RELOC_SFA_BASE, RELOC_SFA_OFF13,
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RELOC_BASE10, RELOC_BASE13, RELOC_BASE22, /* P.I.C. (base-relative) */
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RELOC_PC10, RELOC_PC22, /* for some sort of pc-rel P.I.C. (?) */
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RELOC_JMP_TBL, /* P.I.C. jump table */
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RELOC_SEGOFF16, /* reputedly for shared libraries somehow */
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RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE,
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RELOC_10, RELOC_11,
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RELOC_WDISP2_14,
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RELOC_WDISP19,
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RELOC_HHI22,
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RELOC_HLO10,
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/* 29K relocation types */
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RELOC_JUMPTARG, RELOC_CONST, RELOC_CONSTH,
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RELOC_WDISP14, RELOC_WDISP21,
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NO_RELOC
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};
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#endif /* TC_SPARC or TC_A29K */
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#define __GNU_EXEC_MACROS__
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#ifndef __STRUCT_EXEC_OVERRIDE__
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/* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix
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"struct exec". Don't assume that on this machine, the "struct exec"
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will lay out the same sizes or alignments. */
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struct exec_bytes
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{
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unsigned char a_info[4];
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unsigned char a_text[4];
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unsigned char a_data[4];
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unsigned char a_bss[4];
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unsigned char a_syms[4];
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unsigned char a_entry[4];
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unsigned char a_trsize[4];
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unsigned char a_drsize[4];
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};
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/* How big the "struct exec" is on disk */
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#define EXEC_BYTES_SIZE (8 * 4)
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/* This is the layout in memory of a "struct exec" while we process it. */
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struct exec
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{
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unsigned long a_info; /* Use macros N_MAGIC, etc for access */
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unsigned a_text; /* length of text, in bytes */
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unsigned a_data; /* length of data, in bytes */
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unsigned a_bss; /* length of uninitialized data area for file, in bytes */
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unsigned a_syms; /* length of symbol table data in file, in bytes */
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unsigned a_entry; /* start address */
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unsigned a_trsize; /* length of relocation info for text, in bytes */
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unsigned a_drsize; /* length of relocation info for data, in bytes */
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};
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#endif /* __STRUCT_EXEC_OVERRIDE__ */
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/* these go in the N_MACHTYPE field */
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/* These symbols could be defined by code from Suns...punt 'em */
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#undef M_UNKNOWN
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#undef M_68010
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#undef M_68020
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#undef M_SPARC
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enum machine_type
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{
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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 don't run into any of sun's numbers */
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M_386 = 100,
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M_29K = 101,
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M_RS6000 = 102, /* IBM RS/6000 */
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/* HP/BSD formats */
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M_HP200 = 200, /* hp200 (68010) BSD binary */
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M_HP300 = 300, /* hp300 (68020+68881) BSD binary */
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M_HPUX23 = 0x020C /* hp200/300 HPUX binary */
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};
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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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/* Code indicating object file or impure executable. */
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#ifndef OMAGIC
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#define OMAGIC 0407
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#endif
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/* Code indicating pure executable. */
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#define NMAGIC 0410
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/* Code indicating demand-paged executable. */
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#define ZMAGIC 0413
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/* Virtual Address of text segment from the a.out file. For OMAGIC,
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(almost always "unlinked .o's" these days), should be zero.
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For linked files, should reflect reality if we know it. */
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#ifndef N_TXTADDR
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#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
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#endif
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#ifndef N_BADMAG
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#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
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&& N_MAGIC(x) != NMAGIC \
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&& N_MAGIC(x) != ZMAGIC)
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#endif
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/* By default, segment size is constant. But on some machines, it can
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be a function of the a.out header (e.g. machine type). */
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#ifndef N_SEGSIZE
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#define N_SEGSIZE(x) SEGMENT_SIZE
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#endif
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/* This complexity is for encapsulated COFF support */
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#ifndef _N_HDROFF
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#define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec))
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#endif
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#ifndef N_TXTOFF
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#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
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_N_HDROFF((x)) + sizeof (struct exec) : \
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sizeof (struct exec))
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#endif
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#ifndef N_DATOFF
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#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
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#endif
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#ifndef N_TRELOFF
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#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
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#endif
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#ifndef N_DRELOFF
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#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
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#endif
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#ifndef N_SYMOFF
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#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
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#endif
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#ifndef N_STROFF
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#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
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#endif
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/* Address of text segment in memory after it is loaded. */
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#ifndef N_TXTADDR
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#define N_TXTADDR(x) 0
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#endif
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#ifndef N_DATADDR
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#define N_DATADDR(x) \
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(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
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: (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
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#endif
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/* Address of bss segment in memory after it is loaded. */
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#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
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struct nlist
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{
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union
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{
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char *n_name;
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struct nlist *n_next;
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long n_strx;
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}
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n_un;
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unsigned char n_type;
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char n_other;
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short n_desc;
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unsigned long n_value;
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};
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#define N_UNDF 0
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#define N_ABS 2
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#define N_TEXT 4
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#define N_DATA 6
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#define N_BSS 8
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#define N_COMM 0x12 /* common (visible in shared lib commons) */
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#define N_FN 0x1F /* File name of a .o file */
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/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
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N_DATA, or N_BSS. When the low-order bit of other types is set,
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(e.g. N_WARNING versus N_FN), they are two different types. */
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#define N_EXT 1
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#define N_TYPE 036
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#define N_STAB 0340
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/* The following type indicates the definition of a symbol as being
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an indirect reference to another symbol. The other symbol
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appears as an undefined reference, immediately following this symbol.
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Indirection is asymmetrical. The other symbol's value will be used
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to satisfy requests for the indirect symbol, but not vice versa.
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If the other symbol does not have a definition, libraries will
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be searched to find a definition. */
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#define N_INDR 0xa
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/* The following symbols refer to set elements.
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All the N_SET[ATDB] symbols with the same name form one set.
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Space is allocated for the set in the text section, and each set
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element's value is stored into one word of the space.
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The first word of the space is the length of the set (number of elements).
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The address of the set is made into an N_SETV symbol
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whose name is the same as the name of the set.
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This symbol acts like a N_DATA global symbol
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in that it can satisfy undefined external references. */
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/* These appear as input to LD, in a .o file. */
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#define N_SETA 0x14 /* Absolute set element symbol */
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#define N_SETT 0x16 /* Text set element symbol */
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#define N_SETD 0x18 /* Data set element symbol */
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#define N_SETB 0x1A /* Bss set element symbol */
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/* This is output from LD. */
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#define N_SETV 0x1C /* Pointer to set vector in data area. */
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/* Warning symbol. The text gives a warning message, the next symbol
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in the table will be undefined. When the symbol is referenced, the
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message is printed. */
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#define N_WARNING 0x1e
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/* Weak symbols. These are a GNU extension to the a.out format. The
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semantics are those of ELF weak symbols. Weak symbols are always
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externally visible. The N_WEAK? values are squeezed into the
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available slots. The value of a N_WEAKU symbol is 0. The values
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of the other types are the definitions. */
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#define N_WEAKU 0x0d /* Weak undefined symbol. */
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#define N_WEAKA 0x0e /* Weak absolute symbol. */
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#define N_WEAKT 0x0f /* Weak text symbol. */
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#define N_WEAKD 0x10 /* Weak data symbol. */
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#define N_WEAKB 0x11 /* Weak bss symbol. */
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/* This structure describes a single relocation to be performed.
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The text-relocation section of the file is a vector of these structures,
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all of which apply to the text section.
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Likewise, the data-relocation section applies to the data section. */
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/* The following enum and struct were borrowed from SunOS's
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/usr/include/sun4/a.out.h and extended to handle
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other machines. It is currently used on SPARC and AMD 29000.
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reloc_ext_bytes is how it looks on disk. reloc_info_extended is
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how we might process it on a native host. */
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#if USE_EXTENDED_RELOC
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struct reloc_ext_bytes
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{
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unsigned char r_address[4];
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unsigned char r_index[3];
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unsigned char r_bits[1];
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unsigned char r_addend[4];
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};
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#define RELOC_EXT_BITS_EXTERN_BIG 0x80
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#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
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#define RELOC_EXT_BITS_TYPE_BIG 0x1F
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#define RELOC_EXT_BITS_TYPE_SH_BIG 0
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#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
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#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
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#define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */
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struct reloc_info_extended
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{
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unsigned long r_address;
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unsigned int r_index:24;
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# define r_symbolnum r_index
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unsigned r_extern:1;
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unsigned:2;
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/* RS/6000 compiler does not support enum bitfield
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enum reloc_type r_type:5; */
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enum reloc_type r_type;
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long int r_addend;
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};
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#else
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/* The standard, old-fashioned, Berkeley compatible relocation struct */
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#ifdef TC_I860
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/* NOTE: three bits max, see struct reloc_info_i860.r_type */
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enum i860_reloc_type
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{
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NO_RELOC = 0, BRADDR, LOW0, LOW1, LOW2, LOW3, LOW4, SPLIT0, SPLIT1, SPLIT2, RELOC_32,
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};
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typedef enum i860_reloc_type reloc_type;
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/* NOTE: two bits max, see reloc_info_i860.r_type */
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enum highlow_type
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{
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NO_SPEC = 0, PAIR, HIGH, HIGHADJ,
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};
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struct reloc_info_i860
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{
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unsigned long r_address;
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/*
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* Using bit fields here is a bad idea because the order is not portable. :-(
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*/
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unsigned int r_symbolnum:24;
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unsigned int r_pcrel:1;
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unsigned int r_extern:1;
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/* combining the two field simplifies the argument passing in "new_fix()" */
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/* and is compatible with the existing Sparc #ifdef's */
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/* r_type: highlow_type - bits 5,4; reloc_type - bits 3-0 */
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unsigned int r_type:6;
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long r_addend;
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};
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#endif /* TC_I860 */
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struct reloc_std_bytes
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{
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unsigned char r_address[4];
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unsigned char r_index[3];
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unsigned char r_bits[1];
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};
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#define RELOC_STD_BITS_PCREL_BIG 0x80
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#define RELOC_STD_BITS_PCREL_LITTLE 0x01
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#define RELOC_STD_BITS_LENGTH_BIG 0x60
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#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
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#define RELOC_STD_BITS_LENGTH_LITTLE 0x06
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#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
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#define RELOC_STD_BITS_EXTERN_BIG 0x10
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#define RELOC_STD_BITS_EXTERN_LITTLE 0x08
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#define RELOC_STD_BITS_BASEREL_BIG 0x08
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#define RELOC_STD_BITS_BASEREL_LITTLE 0x08
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#define RELOC_STD_BITS_JMPTABLE_BIG 0x04
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#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
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#define RELOC_STD_BITS_RELATIVE_BIG 0x02
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#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
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#define RELOC_STD_SIZE 8 /* Bytes per relocation entry */
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#endif /* USE_EXTENDED_RELOC */
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#ifndef CUSTOM_RELOC_FORMAT
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struct relocation_info
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{
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/* Address (within segment) to be relocated. */
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int r_address;
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/* The meaning of r_symbolnum depends on r_extern. */
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unsigned int r_symbolnum:24;
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/* Nonzero means value is a pc-relative offset
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and it should be relocated for changes in its own address
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as well as for changes in the symbol or section specified. */
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unsigned int r_pcrel:1;
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/* Length (as exponent of 2) of the field to be relocated.
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Thus, a value of 2 indicates 1<<2 bytes. */
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unsigned int r_length:2;
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/* 1 => relocate with value of symbol.
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r_symbolnum is the index of the symbol
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in file's the symbol table.
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0 => relocate with the address of a segment.
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r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
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(the N_EXT bit may be set also, but signifies nothing). */
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unsigned int r_extern:1;
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/* The next three bits are for SunOS shared libraries, and seem to
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be undocumented. */
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#ifdef TC_NS32K
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unsigned int r_bsr:1;
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unsigned int r_disp:2;
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#else
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unsigned int r_baserel:1; /* Linkage table relative */
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unsigned int r_jmptable:1; /* pc-relative to jump table */
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unsigned int r_relative:1; /* "relative relocation" */
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#endif /* TC_NS32K */
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/* unused */
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unsigned int r_pad:1; /* Padding -- set to zero */
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};
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#endif /* CUSTOM_RELOC_FORMAT */
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#endif /* __A_OUT_GNU_H__ */
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/* end of aout_gnu.h */
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