pdp11v/usr/include/a.out.h
/* @(#)a.out.h 2.1 */
#if u3b || vax
/* COMMON OBJECT FILE FORMAT
File Organization:
_______________________________________________ INCLUDE FILE
|_______________HEADER_DATA___________________|
| |
| File Header | "filehdr.h"
|.............................................|
| |
| Auxilliary Header Information | "aouthdr.h"
| |
|_____________________________________________|
| |
| ".text" section header | "scnhdr.h"
| |
|.............................................|
| |
| ".data" section header | ''
| |
|.............................................|
| |
| ".bss" section header | ''
| |
|_____________________________________________|
|______________RAW_DATA_______________________|
| |
| ".text" section data (rounded to 4 |
| bytes) |
|.............................................|
| |
| ".data" section data (rounded to 4 |
| bytes) |
|_____________________________________________|
|____________RELOCATION_DATA__________________|
| |
| ".text" section relocation data | "reloc.h"
| |
|.............................................|
| |
| ".data" section relocation data | ''
| |
|_____________________________________________|
|__________LINE_NUMBER_DATA_(SDB)_____________|
| |
| ".text" section line numbers | "linenum.h"
| |
|.............................................|
| |
| ".data" section line numbers | ''
| |
|_____________________________________________|
|________________SYMBOL_TABLE_________________|
| |
| ".text", ".data" and ".bss" section | "syms.h"
| symbols | "storclass.h"
| |
|_____________________________________________|
OBJECT FILE COMPONENTS
HEADER FILES:
/usr/include/filehdr.h
/usr/include/aouthdr.h
/usr/include/scnhdr.h
/usr/include/reloc.h
/usr/include/linenum.h
/usr/include/syms.h
/usr/include/storclass.h
STANDARD FILE:
/usr/include/a.out.h "object file" */
/*************************************************filehdr.h********************/
#include "filehdr.h"
/*************************************************aouthdr.h********************/
#include "aouthdr.h"
/*************************************************scnhdr.h*********************/
#include "scnhdr.h"
/*************************************************reloc.h**********************/
#include "reloc.h"
/*************************************************linenum.h********************/
#include "linenum.h"
/*************************************************syms.h/storclass.h***********/
#include "syms.h"
/******************************************************************************/
/* Compatability Kludge ****** see NLIST(3C) */
#define nlist syment
#else /* u370 || pdp11 */
/*
* Format of an a.out header
*/
struct exec { /* a.out header */
#if u370
int a_magic; /* magic number */
int a_stamp; /* The version of a.out */
/* format of this file. */
#else
short a_magic; /* magic number */
#endif
unsigned a_text; /* size of text segment */
/* in bytes */
/* padded out to next */
/* page boundary with */
/* binary zeros. */
unsigned a_data; /* size of initialized data */
/* segment in bytes */
/* padded out to next */
/* page boundary with */
/* binary zeros. */
unsigned a_bss; /* Actual size of */
/* uninitialized data */
/* segment in bytes. */
unsigned a_syms; /* size of symbol table */
unsigned a_entry; /* entry point */
#if u370
unsigned a_trsize; /* size of text relocation */
unsigned a_drsize; /* size of data relocation */
unsigned a_origin; /* The origin to which */
/* this file was */
/* relocated. */
unsigned a_actext; /* The actual size of */
/* the text segment in */
/* bytes. */
unsigned a_acdata; /* The actual size of */
/* the data segment in */
/* bytes. */
#endif
#if pdp11
char a_unused; /* not used */
unsigned char a_hitext; /* high order text bits */
char a_flag; /* reloc info stripped */
char a_stamp; /* environment stamp */
#endif
};
#define A_MAGIC1 0407 /* normal */
#define A_MAGIC0 0401 /* lpd (UNIX/RT) */
#define A_MAGIC2 0410 /* read-only text */
#define A_MAGIC3 0411 /* separated I&D */
#define A_MAGIC4 0405 /* overlay */
#define A_MAGIC5 0437 /* system overlay, separated I&D */
#if u370
struct relocation_info {
long r_address; /* relative to current segment */
unsigned int
r_symbolnum:24, /* if extern then symbol table */
/* ordinal (0, 1, 2, ...) else */
/* segment number (same as symbol types) */
r_pcrel:1, /* if so, segment offset has already */
/* been subtracted */
r_length:2, /* 0=byte, 1=word, 2=long */
r_extern:1, /* does not include value */
/* of symbol referenced */
r_offset:1, /* already includes origin */
/* of this segment (?) */
r_pad:3; /* nothing, yet */
};
#endif
struct nlist { /* symbol table entry */
char n_name[8]; /* symbol name */
#if pdp11
int n_type; /* type flag */
#else
char n_type; /* type flag */
char n_other;
short n_desc;
#endif
unsigned n_value; /* value */
};
/* in invocation of BADMAG macro, argument should not be a function. */
#define BADMAG(X) (X.a_magic != A_MAGIC1 &&\
X.a_magic != A_MAGIC2 &&\
X.a_magic != A_MAGIC3 &&\
X.a_magic != A_MAGIC4 &&\
X.a_magic != A_MAGIC5 &&\
X.a_magic != A_MAGIC0)
/* values for type flag */
#define N_UNDF 0 /* undefined */
#define N_TYPE 037
#define N_FN 037 /* file name symbol */
#if pdp11
#define N_ABS 01 /* absolute */
#define N_TEXT 02 /* text symbol */
#define N_DATA 03 /* data symbol */
#define N_BSS 04 /* bss symbol */
#define N_REG 024 /* register name */
#define N_EXT 040 /* external bit, or'ed in */
#define FORMAT "%.6o" /* to print a value */
#else
#define N_ABS 02 /* absolute */
#define N_TEXT 04 /* text */
#define N_DATA 06 /* data */
#define N_BSS 010
#define N_GSYM 0040 /* global sym: name,,type,0 */
#define N_FNAME 0042 /* procedure name (f77 kludge): name,,,0 */
#define N_FUN 0044 /* procedure: name,,linenumber,address */
#define N_STSYM 0046 /* static symbol: name,,type,address */
#define N_LCSYM 0050 /* .lcomm symbol: name,,type,address */
#define N_BSTR 0060 /* begin structure: name,,, */
#define N_RSYM 0100 /* register sym: name,,register,offset */
#define N_SLINE 0104 /* src line: ,,linenumber,address */
#define N_ESTR 0120 /* end structure: name,,, */
#define N_SSYM 0140 /* structure elt: name,,type,struct_offset */
#define N_SO 0144 /* source file name: name,,,address */
#define N_BENUM 0160 /* begin enum: name,,, */
#define N_LSYM 0200 /* local sym: name,,type,offset */
#define N_SOL 0204 /* #line source filename: name,,,address */
#define N_ENUM 0220 /* enum element: name,,,value */
#define N_PSYM 0240 /* parameter: name,,type,offset */
#define N_ENTRY 0244 /* alternate entry: name,,linenumber,address */
#define N_EENUM 0260 /* end enum: name,,, */
#define N_LBRAC 0300 /* left bracket: ,,nesting level,address */
#define N_RBRAC 0340 /* right bracket: ,,nesting level,address */
#define N_BCOMM 0342 /* begin common: name,,, */
#define N_ECOMM 0344 /* end common: name,,, */
#define N_ECOML 0350 /* end common (local name): ,,,address */
#define N_STRU 0374 /* 2nd entry for structure: str tag,,,length */
#define N_LENG 0376 /* second stab entry with length information */
#define N_EXT 01 /* external bit, or'ed in */
#define FORMAT "%.8x"
#define STABTYPES 0340
#endif
#endif