| /* This file is aout_gnu.h |
| |
| Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 2000, 2002 |
| 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, 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(exec) ((exec).a_info & 0xffff) |
| #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff)) |
| #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff) |
| #define N_SET_INFO(exec, magic, type, flags) \ |
| ((exec).a_info = ((magic) & 0xffff) \ |
| | (((int)(type) & 0xff) << 16) \ |
| | (((flags) & 0xff) << 24)) |
| #define N_SET_MAGIC(exec, magic) \ |
| ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff))) |
| |
| #define N_SET_MACHTYPE(exec, machtype) \ |
| ((exec).a_info = \ |
| ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16)) |
| |
| #define N_SET_FLAGS(exec, flags) \ |
| ((exec).a_info = \ |
| ((exec).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 */ |