103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
#ifndef _SYS_EXEC_AOUT_H_
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#define _SYS_EXEC_AOUT_H_
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/*
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* Header prepended to each a.out file.
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*/
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struct exec {
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unsigned a_midmag; /* magic number */
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unsigned a_text; /* size of text segment */
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unsigned a_data; /* size of initialized data */
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unsigned a_bss; /* size of uninitialized data */
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unsigned a_reltext; /* size of text relocation info */
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unsigned a_reldata; /* size of data relocation info */
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unsigned a_syms; /* size of symbol table */
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unsigned a_entry; /* entry point */
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};
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#define a_magic a_midmag & 0xffff
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/* a_magic (a_midmag & 0x0000ffff) */
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#define RMAGIC 0406 /* relocatable object file */
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#define OMAGIC 0407 /* old impure format */
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#define NMAGIC 0410 /* read-only text */
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/*
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* a_mid ((a_midmag & 0x03ff0000) >> 16)
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*/
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#define MID_ZERO 0 /* unknown - implementation dependent */
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#define MID_SUN010 1 /* sun 68010/68020 binary */
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#define MID_SUN020 2 /* sun 68020-only binary */
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#define MID_PC386 100 /* 386 PC binary. (so quoth BFD) */
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#define MID_HP200 200 /* hp200 (68010) BSD binary */
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#define MID_I386 134 /* i386 BSD binary */
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#define MID_M68K 135 /* m68k BSD binary with 8K page sizes */
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#define MID_M68K4K 136 /* m68k BSD binary with 4K page sizes */
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#define MID_NS32532 137 /* ns32532 */
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#define MID_SPARC 138 /* sparc */
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#define MID_PMAX 139 /* pmax */
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#define MID_VAX1K 140 /* vax 1K page size binaries */
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#define MID_ALPHA 141 /* Alpha BSD binary */
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#define MID_MIPS 142 /* big-endian MIPS */
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#define MID_ARM6 143 /* ARM6 */
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#define MID_SH3 145 /* SH3 */
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#define MID_POWERPC 149 /* big-endian PowerPC */
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#define MID_VAX 150 /* vax */
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#define MID_SPARC64 151 /* LP64 sparc */
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#define MID_HP300 300 /* hp300 (68020+68881) BSD binary */
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#define MID_HPUX 0x20C /* hp200/300 HP-UX binary */
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#define MID_HPUX800 0x20B /* hp800 HP-UX binary */
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/*
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* a_flags ((a_midmag & 0xfc000000 ) << 26)
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*/
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#define EX_PIC 0x10
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#define EX_DYNAMIC 0x20
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#define EX_DPMASK 0x30
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/*
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* Interpretation of the (a_flags & EX_DPMASK) bits:
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*
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* 00 traditional executable or object file
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* 01 object file contains PIC code (set by `as -k')
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* 10 dynamic executable
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* 11 position independent executable image
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* (eg. a shared library)
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*/
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/*
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* The a.out structure's a_midmag field is a network-byteorder encoding
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* of this int
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* FFFFFFmmmmmmmmmmMMMMMMMMMMMMMMMM
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* Where `F' is 6 bits of flag like EX_DYNAMIC,
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* `m' is 10 bits of machine-id like MID_I386, and
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* `M' is 16 bits worth of magic number, ie. ZMAGIC.
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* The macros below will set/get the needed fields.
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*/
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#define N_GETMAGIC(ex) (((ex).a_midmag)&0x0000ffff)
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#define N_GETMID(ex) ((((ex).a_midmag)&0x03ff0000) >> 16)
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#define N_GETFLAG(ex) ((((ex).a_midmag)&0xfc000000 ) << 26)
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/* Valid magic number check. */
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#define N_BADMAG(x) (N_GETMAGIC(x) != RMAGIC && \
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N_GETMAGIC(x) != OMAGIC && \
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N_GETMAGIC(x) != NMAGIC)
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/* Text segment offset. */
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#define N_TXTOFF(x) sizeof(struct exec)
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/* Data segment offset. */
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#define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
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/* Text relocation table offset. */
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#define N_TRELOFF(x) (N_DATOFF(x) + (x).a_data)
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/* Data relocation table offset. */
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#define N_DRELOFF(x) (N_TRELOFF(x) + (x).a_reltext)
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/* Symbol table offset. */
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#define N_SYMOFF(x) (N_GETMAGIC(x) == RMAGIC ? \
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N_DRELOFF(x) + (x).a_reldata : \
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N_DATOFF(x) + (x).a_data)
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#endif
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