diff options
Diffstat (limited to 'include/a.out.h')
| -rw-r--r-- | include/a.out.h | 114 |
1 files changed, 113 insertions, 1 deletions
diff --git a/include/a.out.h b/include/a.out.h index 8191d174d4f..3e6b584b15c 100644 --- a/include/a.out.h +++ b/include/a.out.h @@ -1,4 +1,4 @@ -/* $OpenBSD: a.out.h,v 1.3 2003/06/02 19:34:12 millert Exp $ */ +/* $OpenBSD: a.out.h,v 1.4 2024/10/16 18:47:48 miod Exp $ */ /* $NetBSD: a.out.h,v 1.15 1994/10/26 00:55:42 cgd Exp $ */ /*- @@ -36,6 +36,118 @@ #ifndef _AOUT_H_ #define _AOUT_H_ +/* + * Legacy a.out structures and defines. + */ + +/* + * Header prepended to each a.out file. + * only manipulate the a_midmag field via the + * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros below. + */ +struct exec { + u_int32_t a_midmag; /* htonl(flags<<26|mid<<16|magic) */ + u_int32_t a_text; /* text segment size */ + u_int32_t a_data; /* initialized data size */ + u_int32_t a_bss; /* uninitialized data size */ + u_int32_t a_syms; /* symbol table size */ + u_int32_t a_entry; /* entry point */ + u_int32_t a_trsize; /* text relocation size */ + u_int32_t a_drsize; /* data relocation size */ +}; + +/* a_magic */ +#define OMAGIC 0407 /* old impure format */ +#define NMAGIC 0410 /* read-only text */ +#define ZMAGIC 0413 /* demand load format */ +#define QMAGIC 0314 /* "compact" demand load format; deprecated */ + +/* + * a_flags + */ +#define EX_DYNAMIC 0x20 +#define EX_PIC 0x10 +#define EX_DPMASK 0x30 +/* + * Interpretation of the (a_flags & EX_DPMASK) bits: + * + * 00 traditional executable or object file + * 01 object file contains PIC code (set by `as -k') + * 10 dynamic executable + * 11 position independent executable image + * (eg. a shared library) + * + */ + +/* + * The a.out structure's a_midmag field is a network-byteorder encoding + * of this int + * FFFFFFmmmmmmmmmmMMMMMMMMMMMMMMMM + * Where `F' is 6 bits of flag like EX_DYNAMIC, + * `m' is 10 bits of machine-id like MID_I386, and + * `M' is 16 bits worth of magic number, ie. ZMAGIC. + * The macros below will set/get the needed fields. + */ +#define N_GETMAGIC(ex) \ + ( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : ((ex).a_midmag)) +#define N_GETMAGIC2(ex) \ + ( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : \ + (((ex).a_midmag) | 0x10000) ) +#define N_GETMID(ex) \ + ( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>16)&0x03ff) : MID_ZERO ) +#define N_GETFLAG(ex) \ + ( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>26)&0x3f) : 0 ) +#define N_SETMAGIC(ex,mag,mid,flag) \ + ( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \ + (((mag)&0xffff)) ) ) + +#define N_ALIGN(ex,x) \ + (N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC ? \ + ((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x)) + +/* Valid magic number check. */ +#define N_BADMAG(ex) \ + (N_GETMAGIC(ex) != NMAGIC && N_GETMAGIC(ex) != OMAGIC && \ + N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC) + +/* Address of the bottom of the text segment. */ +#define N_TXTADDR(ex) (N_GETMAGIC2(ex) == (ZMAGIC|0x10000) ? 0 : __LDPGSZ) + +/* Address of the bottom of the data segment. */ +#define N_DATADDR(ex) \ + (N_GETMAGIC(ex) == OMAGIC ? N_TXTADDR(ex) + (ex).a_text : \ + (N_TXTADDR(ex) + (ex).a_text + __LDPGSZ - 1) & ~(__LDPGSZ - 1)) + +/* Address of the bottom of the bss segment. */ +#define N_BSSADDR(ex) \ + (N_DATADDR(ex) + (ex).a_data) + +/* Text segment offset. */ +#define N_TXTOFF(ex) \ + ( N_GETMAGIC2(ex)==ZMAGIC || N_GETMAGIC2(ex)==(QMAGIC|0x10000) ? \ + 0 : (N_GETMAGIC2(ex)==(ZMAGIC|0x10000) ? __LDPGSZ : \ + sizeof(struct exec)) ) + +/* Data segment offset. */ +#define N_DATOFF(ex) \ + N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text) + +/* Text relocation table offset. */ +#define N_TRELOFF(ex) \ + (N_DATOFF(ex) + (ex).a_data) + +/* Data relocation table offset. */ +#define N_DRELOFF(ex) \ + (N_TRELOFF(ex) + (ex).a_trsize) + +/* Symbol table offset. */ +#define N_SYMOFF(ex) \ + (N_DRELOFF(ex) + (ex).a_drsize) + +/* String table offset. */ +#define N_STROFF(ex) \ + (N_SYMOFF(ex) + (ex).a_syms) + #include <sys/exec.h> #define _AOUT_INCLUDE_ |