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Add weak symbols as an extension to a.out. 

* aout64.h (N_WEAKU, N_WEAKA, N_WEAKT, N_WEAKD, N_WEAKB): Define.
	* stab.def: Update symbol value table.
This commit is contained in:
Ian Lance Taylor 1994-06-11 20:39:54 +00:00
parent 110548816a
commit 0242cd5697
2 changed files with 79 additions and 28 deletions
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22
include/aout/ChangeLog
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@ -1,3 +1,18 @@
Sat Jun 11 16:16:09 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
Add weak symbols as an extension to a.out.
* aout64.h (N_WEAKU, N_WEAKA, N_WEAKT, N_WEAKD, N_WEAKB): Define.
* stab.def: Update symbol value table.
Thu Jun 2 17:13:38 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* sun4.h (EXTERNAL_SUN4_DYNAMIC_DEBUGGER_SIZE): Correct from 28 to
24. Fix up ld_got comment.
Wed Mar 30 00:31:49 1994 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
* dynix3.h: Cleanup, adapt to current bfd version.
Sat Feb 26 10:25:53 1994 Ian Lance Taylor (ian@cygnus.com) Sat Feb 26 10:25:53 1994 Ian Lance Taylor (ian@cygnus.com)
* aout64.h: Add casts to avoid warnings from SVR4 cc. * aout64.h: Add casts to avoid warnings from SVR4 cc.
@ -128,6 +143,7 @@ Sat Nov 30 20:34:52 1991 Steve Chamberlain (sac at rtl.cygnus.com)
reloc.h, stab.def, stab_gnu.h, sun4.h: All moved from the reloc.h, stab.def, stab_gnu.h, sun4.h: All moved from the
devo/include directory devo/include directory
Local Variables:
version-control: never
End:

85
include/aout/aout64.h
View File

@ -38,7 +38,7 @@ struct external_exec
#define ZMAGIC 0413 /* Code indicating demand-paged executable. */ #define ZMAGIC 0413 /* Code indicating demand-paged executable. */
/* This indicates a demand-paged executable with the header in the text. /* This indicates a demand-paged executable with the header in the text.
As far as I know it is only used by 386BSD and/or BSDI. */ It is used by 386BSD (and variants) and Linux, at least. */
#define QMAGIC 0314 #define QMAGIC 0314
# ifndef N_BADMAG # ifndef N_BADMAG
# define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \ # define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
@ -121,6 +121,11 @@ struct external_exec
#define N_SHARED_LIB(x) ((x).a_entry < TEXT_START_ADDR) #define N_SHARED_LIB(x) ((x).a_entry < TEXT_START_ADDR)
#endif #endif
/* Returning 0 not TEXT_START_ADDR for OMAGIC and NMAGIC is based on
the assumption that we are dealing with a .o file, not an
executable. This is necessary for OMAGIC (but means we don't work
right on the output from ld -N); more questionable for NMAGIC. */
#ifndef N_TXTADDR #ifndef N_TXTADDR
#define N_TXTADDR(x) \ #define N_TXTADDR(x) \
(/* The address of a QMAGIC file is always one page in, */ \ (/* The address of a QMAGIC file is always one page in, */ \
@ -134,6 +139,19 @@ struct external_exec
) )
#endif #endif
/* If N_HEADER_IN_TEXT is not true for ZMAGIC, there is some padding
to make the text segment start at a certain boundary. For most
systems, this boundary is PAGE_SIZE. But for Linux, in the
time-honored tradition of crazy ZMAGIC hacks, it is 1024 which is
not what PAGE_SIZE needs to be for QMAGIC. */
#ifndef ZMAGIC_DISK_BLOCK_SIZE
#define ZMAGIC_DISK_BLOCK_SIZE PAGE_SIZE
#endif
#define N_DISK_BLOCK_SIZE(x) \
(N_MAGIC(x) == ZMAGIC ? ZMAGIC_DISK_BLOCK_SIZE : PAGE_SIZE)
/* Offset in an a.out of the start of the text section. */ /* Offset in an a.out of the start of the text section. */
#ifndef N_TXTOFF #ifndef N_TXTOFF
#define N_TXTOFF(x) \ #define N_TXTOFF(x) \
@ -142,7 +160,7 @@ struct external_exec
N_SHARED_LIB(x) ? 0 : \ N_SHARED_LIB(x) ? 0 : \
N_HEADER_IN_TEXT(x) ? \ N_HEADER_IN_TEXT(x) ? \
EXEC_BYTES_SIZE : /* no padding */\ EXEC_BYTES_SIZE : /* no padding */\
PAGE_SIZE /* a page of padding */\ ZMAGIC_DISK_BLOCK_SIZE /* a page of padding */\
) )
#endif #endif
/* Size of the text section. It's always as stated, except that we /* Size of the text section. It's always as stated, except that we
@ -174,15 +192,21 @@ struct external_exec
/* Offsets of the various portions of the file after the text segment. */ /* Offsets of the various portions of the file after the text segment. */
/* For {N,Q,Z}MAGIC, there is padding to make the data segment start /* For {Q,Z}MAGIC, there is padding to make the data segment start on
on a page boundary. Most of the time the a_text field (and thus a page boundary. Most of the time the a_text field (and thus
N_TXTSIZE) already contains this padding. But if it doesn't (I N_TXTSIZE) already contains this padding. It is possible that for
think maybe this happens on BSDI and/or 386BSD), then add it. */ BSDI and/or 386BSD it sometimes doesn't contain the padding, and
perhaps we should be adding it here. But this seems kind of
questionable and probably should be BSDI/386BSD-specific if we do
do it.
For NMAGIC (at least for hp300 BSD, probably others), there is
padding in memory only, not on disk, so we must *not* ever pad here
for NMAGIC. */
#ifndef N_DATOFF #ifndef N_DATOFF
#define N_DATOFF(x) \ #define N_DATOFF(x) \
(N_MAGIC(x) == OMAGIC ? N_TXTOFF(x) + N_TXTSIZE(x) : \ (N_TXTOFF(x) + N_TXTSIZE(x))
PAGE_SIZE + ((N_TXTOFF(x) + N_TXTSIZE(x) - 1) & ~(PAGE_SIZE - 1)))
#endif #endif
#ifndef N_TRELOFF #ifndef N_TRELOFF
@ -263,6 +287,17 @@ struct internal_nlist {
#define N_WARNING 0x1e #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. */
/* Relocations /* Relocations
There are two types of relocation flavours for a.out systems, There are two types of relocation flavours for a.out systems,
@ -286,25 +321,25 @@ struct reloc_std_external {
bfd_byte r_type[1]; /* relocation type */ bfd_byte r_type[1]; /* relocation type */
}; };
#define RELOC_STD_BITS_PCREL_BIG 0x80 #define RELOC_STD_BITS_PCREL_BIG ((unsigned int) 0x80)
#define RELOC_STD_BITS_PCREL_LITTLE 0x01 #define RELOC_STD_BITS_PCREL_LITTLE ((unsigned int) 0x01)
#define RELOC_STD_BITS_LENGTH_BIG 0x60 #define RELOC_STD_BITS_LENGTH_BIG ((unsigned int) 0x60)
#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ #define RELOC_STD_BITS_LENGTH_SH_BIG 5
#define RELOC_STD_BITS_LENGTH_LITTLE 0x06 #define RELOC_STD_BITS_LENGTH_LITTLE ((unsigned int) 0x06)
#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
#define RELOC_STD_BITS_EXTERN_BIG 0x10 #define RELOC_STD_BITS_EXTERN_BIG ((unsigned int) 0x10)
#define RELOC_STD_BITS_EXTERN_LITTLE 0x08 #define RELOC_STD_BITS_EXTERN_LITTLE ((unsigned int) 0x08)
#define RELOC_STD_BITS_BASEREL_BIG 0x08 #define RELOC_STD_BITS_BASEREL_BIG ((unsigned int) 0x08)
#define RELOC_STD_BITS_BASEREL_LITTLE 0x10 #define RELOC_STD_BITS_BASEREL_LITTLE ((unsigned int) 0x10)
#define RELOC_STD_BITS_JMPTABLE_BIG 0x04 #define RELOC_STD_BITS_JMPTABLE_BIG ((unsigned int) 0x04)
#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 #define RELOC_STD_BITS_JMPTABLE_LITTLE ((unsigned int) 0x20)
#define RELOC_STD_BITS_RELATIVE_BIG 0x02 #define RELOC_STD_BITS_RELATIVE_BIG ((unsigned int) 0x02)
#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 #define RELOC_STD_BITS_RELATIVE_LITTLE ((unsigned int) 0x40)
#define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */ #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */
@ -346,12 +381,12 @@ struct reloc_ext_external {
bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */ bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */
}; };
#define RELOC_EXT_BITS_EXTERN_BIG 0x80 #define RELOC_EXT_BITS_EXTERN_BIG ((unsigned int) 0x80)
#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 #define RELOC_EXT_BITS_EXTERN_LITTLE ((unsigned int) 0x01)
#define RELOC_EXT_BITS_TYPE_BIG 0x1F #define RELOC_EXT_BITS_TYPE_BIG ((unsigned int) 0x1F)
#define RELOC_EXT_BITS_TYPE_SH_BIG 0 #define RELOC_EXT_BITS_TYPE_SH_BIG 0
#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 #define RELOC_EXT_BITS_TYPE_LITTLE ((unsigned int) 0xF8)
#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
/* Bytes per relocation entry */ /* Bytes per relocation entry */