mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-12 03:43:33 +08:00
451 lines
13 KiB
C
451 lines
13 KiB
C
/* This file is aout_gnu.h
|
||
|
||
Copyright (C) 1987-2016 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 3, 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,
|
||
Boston, MA 02110-1301, USA. */
|
||
|
||
#ifndef __A_OUT_GNU_H__
|
||
#define __A_OUT_GNU_H__
|
||
|
||
/* There are two main flavours of a.out, one which uses the standard
|
||
relocations, and one which uses extended relocations.
|
||
|
||
Today, the extended reloc uses are
|
||
TC_SPARC
|
||
|
||
each must define the enum reloc_type
|
||
|
||
*/
|
||
|
||
#define USE_EXTENDED_RELOC defined(TC_SPARC)
|
||
|
||
#if defined(TC_SPARC)
|
||
enum reloc_type
|
||
{
|
||
RELOC_8, RELOC_16, RELOC_32,/* simple relocations */
|
||
RELOC_DISP8, RELOC_DISP16, RELOC_DISP32, /* pc-rel displacement */
|
||
RELOC_WDISP30, RELOC_WDISP22,
|
||
RELOC_HI22, RELOC_22,
|
||
RELOC_13, RELOC_LO10,
|
||
RELOC_SFA_BASE, RELOC_SFA_OFF13,
|
||
RELOC_BASE10, RELOC_BASE13, RELOC_BASE22, /* P.I.C. (base-relative) */
|
||
RELOC_PC10, RELOC_PC22, /* for some sort of pc-rel P.I.C. (?) */
|
||
RELOC_JMP_TBL, /* P.I.C. jump table */
|
||
RELOC_SEGOFF16, /* reputedly for shared libraries somehow */
|
||
RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE,
|
||
RELOC_10, RELOC_11,
|
||
RELOC_WDISP2_14,
|
||
RELOC_WDISP19,
|
||
RELOC_HHI22,
|
||
RELOC_HLO10,
|
||
|
||
/* 29K relocation types */
|
||
RELOC_JUMPTARG, RELOC_CONST, RELOC_CONSTH,
|
||
|
||
RELOC_WDISP14, RELOC_WDISP21,
|
||
|
||
NO_RELOC
|
||
};
|
||
|
||
#endif /* TC_SPARC */
|
||
|
||
#define __GNU_EXEC_MACROS__
|
||
|
||
#ifndef __STRUCT_EXEC_OVERRIDE__
|
||
|
||
/* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix
|
||
"struct exec". Don't assume that on this machine, the "struct exec"
|
||
will lay out the same sizes or alignments. */
|
||
|
||
struct exec_bytes
|
||
{
|
||
unsigned char a_info[4];
|
||
unsigned char a_text[4];
|
||
unsigned char a_data[4];
|
||
unsigned char a_bss[4];
|
||
unsigned char a_syms[4];
|
||
unsigned char a_entry[4];
|
||
unsigned char a_trsize[4];
|
||
unsigned char a_drsize[4];
|
||
};
|
||
|
||
/* How big the "struct exec" is on disk */
|
||
#define EXEC_BYTES_SIZE (8 * 4)
|
||
|
||
/* This is the layout in memory of a "struct exec" while we process it. */
|
||
|
||
struct exec
|
||
{
|
||
unsigned long a_info; /* Use macros N_MAGIC, etc for access */
|
||
unsigned a_text; /* length of text, in bytes */
|
||
unsigned a_data; /* length of data, in bytes */
|
||
unsigned a_bss; /* length of uninitialized data area for file, in bytes */
|
||
unsigned a_syms; /* length of symbol table data in file, in bytes */
|
||
unsigned a_entry; /* start address */
|
||
unsigned a_trsize; /* length of relocation info for text, in bytes */
|
||
unsigned a_drsize; /* length of relocation info for data, in bytes */
|
||
};
|
||
|
||
#endif /* __STRUCT_EXEC_OVERRIDE__ */
|
||
|
||
/* these go in the N_MACHTYPE field */
|
||
/* These symbols could be defined by code from Suns...punt 'em */
|
||
#undef M_UNKNOWN
|
||
#undef M_68010
|
||
#undef M_68020
|
||
#undef M_SPARC
|
||
enum machine_type
|
||
{
|
||
M_UNKNOWN = 0,
|
||
M_68010 = 1,
|
||
M_68020 = 2,
|
||
M_SPARC = 3,
|
||
/* skip a bunch so we don't run into any of sun's numbers */
|
||
M_386 = 100,
|
||
M_29K = 101,
|
||
M_RS6000 = 102, /* IBM RS/6000 */
|
||
M_VAX4K_NETBSD = 150,
|
||
/* HP/BSD formats */
|
||
M_HP200 = 200, /* hp200 (68010) BSD binary */
|
||
M_HP300 = 300, /* hp300 (68020+68881) BSD binary */
|
||
M_HPUX23 = 0x020C /* hp200/300 HPUX binary */
|
||
};
|
||
|
||
#define N_MAGIC(execp) ((execp)->a_info & 0xffff)
|
||
#define N_MACHTYPE(execp) ((enum machine_type)(((execp)->a_info >> 16) & 0xff))
|
||
#define N_FLAGS(execp) (((execp)->a_info >> 24) & 0xff)
|
||
#define N_SET_INFO(execp, magic, type, flags) \
|
||
((execp)->a_info = ((magic) & 0xffff) \
|
||
| (((int)(type) & 0xff) << 16) \
|
||
| (((flags) & 0xff) << 24))
|
||
#define N_SET_MAGIC(execp, magic) \
|
||
((execp)->a_info = (((execp)->a_info & 0xffff0000) | ((magic) & 0xffff)))
|
||
|
||
#define N_SET_MACHTYPE(execp, machtype) \
|
||
((execp)->a_info = \
|
||
((execp)->a_info & 0xff00ffff) | ((((int) (machtype)) & 0xff) << 16))
|
||
|
||
#define N_SET_FLAGS(execp, flags) \
|
||
((execp)->a_info = \
|
||
((execp)->a_info & 0x00ffffff) | (((flags) & 0xff) << 24))
|
||
|
||
/* Code indicating object file or impure executable. */
|
||
#ifndef OMAGIC
|
||
#define OMAGIC 0407
|
||
#endif
|
||
/* Code indicating pure executable. */
|
||
#define NMAGIC 0410
|
||
/* Code indicating demand-paged executable. */
|
||
#define ZMAGIC 0413
|
||
|
||
/* Virtual Address of text segment from the a.out file. For OMAGIC,
|
||
(almost always "unlinked .o's" these days), should be zero.
|
||
For linked files, should reflect reality if we know it. */
|
||
|
||
#ifndef N_TXTADDR
|
||
#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
|
||
#endif
|
||
|
||
#ifndef N_BADMAG
|
||
#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
|
||
&& N_MAGIC(x) != NMAGIC \
|
||
&& N_MAGIC(x) != ZMAGIC)
|
||
#endif
|
||
|
||
/* By default, segment size is constant. But on some machines, it can
|
||
be a function of the a.out header (e.g. machine type). */
|
||
#ifndef N_SEGSIZE
|
||
#define N_SEGSIZE(x) SEGMENT_SIZE
|
||
#endif
|
||
|
||
/* This complexity is for encapsulated COFF support */
|
||
#ifndef _N_HDROFF
|
||
#define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec))
|
||
#endif
|
||
|
||
#ifndef N_TXTOFF
|
||
#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
|
||
_N_HDROFF((x)) + sizeof (struct exec) : \
|
||
sizeof (struct exec))
|
||
#endif
|
||
|
||
#ifndef N_DATOFF
|
||
#define N_DATOFF(x) ( N_TXTOFF(x) + (x)->a_text )
|
||
#endif
|
||
|
||
#ifndef N_TRELOFF
|
||
#define N_TRELOFF(x) ( N_DATOFF(x) + (x)->a_data )
|
||
#endif
|
||
|
||
#ifndef N_DRELOFF
|
||
#define N_DRELOFF(x) ( N_TRELOFF(x) + (x)->a_trsize )
|
||
#endif
|
||
|
||
#ifndef N_SYMOFF
|
||
#define N_SYMOFF(x) ( N_DRELOFF(x) + (x)->a_drsize )
|
||
#endif
|
||
|
||
#ifndef N_STROFF
|
||
#define N_STROFF(x) ( N_SYMOFF(x) + (x)->a_syms )
|
||
#endif
|
||
|
||
/* Address of text segment in memory after it is loaded. */
|
||
#ifndef N_TXTADDR
|
||
#define N_TXTADDR(x) 0
|
||
#endif
|
||
|
||
#ifndef N_DATADDR
|
||
#define N_DATADDR(x) \
|
||
(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x)->a_text) \
|
||
: (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x)->a_text-1) & ~(N_SEGSIZE(x)-1))))
|
||
#endif
|
||
|
||
/* Address of bss segment in memory after it is loaded. */
|
||
#define N_BSSADDR(x) (N_DATADDR(x) + (x)->a_data)
|
||
|
||
struct nlist
|
||
{
|
||
union
|
||
{
|
||
char *n_name;
|
||
struct nlist *n_next;
|
||
long n_strx;
|
||
}
|
||
n_un;
|
||
unsigned char n_type;
|
||
char n_other;
|
||
short n_desc;
|
||
unsigned long n_value;
|
||
};
|
||
|
||
#define N_UNDF 0
|
||
#define N_ABS 2
|
||
#define N_TEXT 4
|
||
#define N_DATA 6
|
||
#define N_BSS 8
|
||
#define N_COMM 0x12 /* common (visible in shared lib commons) */
|
||
#define N_FN 0x1F /* File name of a .o file */
|
||
|
||
/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
|
||
N_DATA, or N_BSS. When the low-order bit of other types is set,
|
||
(e.g. N_WARNING versus N_FN), they are two different types. */
|
||
#define N_EXT 1
|
||
#define N_TYPE 036
|
||
#define N_STAB 0340
|
||
|
||
/* The following type indicates the definition of a symbol as being
|
||
an indirect reference to another symbol. The other symbol
|
||
appears as an undefined reference, immediately following this symbol.
|
||
|
||
Indirection is asymmetrical. The other symbol's value will be used
|
||
to satisfy requests for the indirect symbol, but not vice versa.
|
||
If the other symbol does not have a definition, libraries will
|
||
be searched to find a definition. */
|
||
|
||
#define N_INDR 0xa
|
||
|
||
/* The following symbols refer to set elements.
|
||
All the N_SET[ATDB] symbols with the same name form one set.
|
||
Space is allocated for the set in the text section, and each set
|
||
element's value is stored into one word of the space.
|
||
The first word of the space is the length of the set (number of elements).
|
||
|
||
The address of the set is made into an N_SETV symbol
|
||
whose name is the same as the name of the set.
|
||
This symbol acts like a N_DATA global symbol
|
||
in that it can satisfy undefined external references. */
|
||
|
||
/* These appear as input to LD, in a .o file. */
|
||
#define N_SETA 0x14 /* Absolute set element symbol */
|
||
#define N_SETT 0x16 /* Text set element symbol */
|
||
#define N_SETD 0x18 /* Data set element symbol */
|
||
#define N_SETB 0x1A /* Bss set element symbol */
|
||
|
||
/* This is output from LD. */
|
||
#define N_SETV 0x1C /* Pointer to set vector in data area. */
|
||
|
||
/* Warning symbol. The text gives a warning message, the next symbol
|
||
in the table will be undefined. When the symbol is referenced, the
|
||
message is printed. */
|
||
|
||
#define N_WARNING 0x1e
|
||
|
||
/* Weak symbols. These are a GNU extension to the a.out format. The
|
||
semantics are those of ELF weak symbols. Weak symbols are always
|
||
externally visible. The N_WEAK? values are squeezed into the
|
||
available slots. The value of a N_WEAKU symbol is 0. The values
|
||
of the other types are the definitions. */
|
||
#define N_WEAKU 0x0d /* Weak undefined symbol. */
|
||
#define N_WEAKA 0x0e /* Weak absolute symbol. */
|
||
#define N_WEAKT 0x0f /* Weak text symbol. */
|
||
#define N_WEAKD 0x10 /* Weak data symbol. */
|
||
#define N_WEAKB 0x11 /* Weak bss symbol. */
|
||
|
||
/* This structure describes a single relocation to be performed.
|
||
The text-relocation section of the file is a vector of these structures,
|
||
all of which apply to the text section.
|
||
Likewise, the data-relocation section applies to the data section. */
|
||
|
||
/* The following enum and struct were borrowed from SunOS's
|
||
/usr/include/sun4/a.out.h and extended to handle
|
||
other machines. It is currently used on SPARC and AMD 29000.
|
||
|
||
reloc_ext_bytes is how it looks on disk. reloc_info_extended is
|
||
how we might process it on a native host. */
|
||
#if USE_EXTENDED_RELOC
|
||
|
||
struct reloc_ext_bytes
|
||
{
|
||
unsigned char r_address[4];
|
||
unsigned char r_index[3];
|
||
unsigned char r_bits[1];
|
||
unsigned char r_addend[4];
|
||
};
|
||
|
||
#define RELOC_EXT_BITS_EXTERN_BIG 0x80
|
||
#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
|
||
|
||
#define RELOC_EXT_BITS_TYPE_BIG 0x1F
|
||
#define RELOC_EXT_BITS_TYPE_SH_BIG 0
|
||
#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
|
||
#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
|
||
|
||
#define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */
|
||
|
||
struct reloc_info_extended
|
||
{
|
||
unsigned long r_address;
|
||
unsigned int r_index:24;
|
||
# define r_symbolnum r_index
|
||
unsigned r_extern:1;
|
||
unsigned:2;
|
||
/* RS/6000 compiler does not support enum bitfield
|
||
enum reloc_type r_type:5; */
|
||
enum reloc_type r_type;
|
||
long int r_addend;
|
||
};
|
||
|
||
#else
|
||
|
||
/* The standard, old-fashioned, Berkeley compatible relocation struct */
|
||
|
||
#ifdef TC_I860
|
||
/* NOTE: three bits max, see struct reloc_info_i860.r_type */
|
||
enum i860_reloc_type
|
||
{
|
||
NO_RELOC = 0, BRADDR, LOW0, LOW1, LOW2, LOW3, LOW4, SPLIT0, SPLIT1, SPLIT2, RELOC_32,
|
||
};
|
||
|
||
typedef enum i860_reloc_type reloc_type;
|
||
|
||
/* NOTE: two bits max, see reloc_info_i860.r_type */
|
||
enum highlow_type
|
||
{
|
||
NO_SPEC = 0, PAIR, HIGH, HIGHADJ,
|
||
};
|
||
|
||
struct reloc_info_i860
|
||
{
|
||
unsigned long r_address;
|
||
/*
|
||
* Using bit fields here is a bad idea because the order is not portable. :-(
|
||
*/
|
||
unsigned int r_symbolnum:24;
|
||
unsigned int r_pcrel:1;
|
||
unsigned int r_extern:1;
|
||
/* combining the two field simplifies the argument passing in "new_fix()" */
|
||
/* and is compatible with the existing Sparc #ifdef's */
|
||
/* r_type: highlow_type - bits 5,4; reloc_type - bits 3-0 */
|
||
unsigned int r_type:6;
|
||
long r_addend;
|
||
};
|
||
|
||
#endif /* TC_I860 */
|
||
|
||
struct reloc_std_bytes
|
||
{
|
||
unsigned char r_address[4];
|
||
unsigned char r_index[3];
|
||
unsigned char r_bits[1];
|
||
};
|
||
|
||
#define RELOC_STD_BITS_PCREL_BIG 0x80
|
||
#define RELOC_STD_BITS_PCREL_LITTLE 0x01
|
||
|
||
#define RELOC_STD_BITS_LENGTH_BIG 0x60
|
||
#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
|
||
#define RELOC_STD_BITS_LENGTH_LITTLE 0x06
|
||
#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
|
||
|
||
#define RELOC_STD_BITS_EXTERN_BIG 0x10
|
||
#define RELOC_STD_BITS_EXTERN_LITTLE 0x08
|
||
|
||
#define RELOC_STD_BITS_BASEREL_BIG 0x08
|
||
#define RELOC_STD_BITS_BASEREL_LITTLE 0x08
|
||
|
||
#define RELOC_STD_BITS_JMPTABLE_BIG 0x04
|
||
#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
|
||
|
||
#define RELOC_STD_BITS_RELATIVE_BIG 0x02
|
||
#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
|
||
|
||
#define RELOC_STD_SIZE 8 /* Bytes per relocation entry */
|
||
|
||
#endif /* USE_EXTENDED_RELOC */
|
||
|
||
#ifndef CUSTOM_RELOC_FORMAT
|
||
struct relocation_info
|
||
{
|
||
/* Address (within segment) to be relocated. */
|
||
int r_address;
|
||
/* The meaning of r_symbolnum depends on r_extern. */
|
||
unsigned int r_symbolnum:24;
|
||
/* Nonzero means value is a pc-relative offset
|
||
and it should be relocated for changes in its own address
|
||
as well as for changes in the symbol or section specified. */
|
||
unsigned int r_pcrel:1;
|
||
/* Length (as exponent of 2) of the field to be relocated.
|
||
Thus, a value of 2 indicates 1<<2 bytes. */
|
||
unsigned int r_length:2;
|
||
/* 1 => relocate with value of symbol.
|
||
r_symbolnum is the index of the symbol
|
||
in file's the symbol table.
|
||
0 => relocate with the address of a segment.
|
||
r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
|
||
(the N_EXT bit may be set also, but signifies nothing). */
|
||
unsigned int r_extern:1;
|
||
/* The next three bits are for SunOS shared libraries, and seem to
|
||
be undocumented. */
|
||
#ifdef TC_NS32K
|
||
unsigned int r_bsr:1;
|
||
unsigned int r_disp:2;
|
||
#else
|
||
unsigned int r_baserel:1; /* Linkage table relative */
|
||
unsigned int r_jmptable:1; /* pc-relative to jump table */
|
||
unsigned int r_relative:1; /* "relative relocation" */
|
||
#endif /* TC_NS32K */
|
||
/* unused */
|
||
unsigned int r_pad:1; /* Padding -- set to zero */
|
||
};
|
||
|
||
#endif /* CUSTOM_RELOC_FORMAT */
|
||
|
||
#endif /* __A_OUT_GNU_H__ */
|
||
|
||
/* end of aout_gnu.h */
|