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
parent
110548816a
commit
0242cd5697
2 changed files with 79 additions and 28 deletions
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@ -1,3 +1,18 @@
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Sat Jun 11 16:16:09 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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Add weak symbols as an extension to a.out.
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* aout64.h (N_WEAKU, N_WEAKA, N_WEAKT, N_WEAKD, N_WEAKB): Define.
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* stab.def: Update symbol value table.
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Thu Jun 2 17:13:38 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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* sun4.h (EXTERNAL_SUN4_DYNAMIC_DEBUGGER_SIZE): Correct from 28 to
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24. Fix up ld_got comment.
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Wed Mar 30 00:31:49 1994 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
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* dynix3.h: Cleanup, adapt to current bfd version.
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Sat Feb 26 10:25:53 1994 Ian Lance Taylor (ian@cygnus.com)
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* aout64.h: Add casts to avoid warnings from SVR4 cc.
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@ -128,6 +143,7 @@ Sat Nov 30 20:34:52 1991 Steve Chamberlain (sac at rtl.cygnus.com)
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reloc.h, stab.def, stab_gnu.h, sun4.h: All moved from the
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devo/include directory
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Local Variables:
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version-control: never
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End:
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@ -38,7 +38,7 @@ struct external_exec
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#define ZMAGIC 0413 /* Code indicating demand-paged executable. */
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/* This indicates a demand-paged executable with the header in the text.
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As far as I know it is only used by 386BSD and/or BSDI. */
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It is used by 386BSD (and variants) and Linux, at least. */
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#define QMAGIC 0314
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# ifndef N_BADMAG
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# define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
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@ -121,6 +121,11 @@ struct external_exec
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#define N_SHARED_LIB(x) ((x).a_entry < TEXT_START_ADDR)
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#endif
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/* Returning 0 not TEXT_START_ADDR for OMAGIC and NMAGIC is based on
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the assumption that we are dealing with a .o file, not an
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executable. This is necessary for OMAGIC (but means we don't work
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right on the output from ld -N); more questionable for NMAGIC. */
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#ifndef N_TXTADDR
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#define N_TXTADDR(x) \
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(/* The address of a QMAGIC file is always one page in, */ \
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@ -134,6 +139,19 @@ struct external_exec
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)
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#endif
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/* If N_HEADER_IN_TEXT is not true for ZMAGIC, there is some padding
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to make the text segment start at a certain boundary. For most
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systems, this boundary is PAGE_SIZE. But for Linux, in the
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time-honored tradition of crazy ZMAGIC hacks, it is 1024 which is
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not what PAGE_SIZE needs to be for QMAGIC. */
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#ifndef ZMAGIC_DISK_BLOCK_SIZE
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#define ZMAGIC_DISK_BLOCK_SIZE PAGE_SIZE
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#endif
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#define N_DISK_BLOCK_SIZE(x) \
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(N_MAGIC(x) == ZMAGIC ? ZMAGIC_DISK_BLOCK_SIZE : PAGE_SIZE)
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/* Offset in an a.out of the start of the text section. */
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#ifndef N_TXTOFF
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#define N_TXTOFF(x) \
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@ -142,7 +160,7 @@ struct external_exec
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N_SHARED_LIB(x) ? 0 : \
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N_HEADER_IN_TEXT(x) ? \
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EXEC_BYTES_SIZE : /* no padding */\
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PAGE_SIZE /* a page of padding */\
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ZMAGIC_DISK_BLOCK_SIZE /* a page of padding */\
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)
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#endif
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/* Size of the text section. It's always as stated, except that we
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@ -174,15 +192,21 @@ struct external_exec
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/* Offsets of the various portions of the file after the text segment. */
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/* For {N,Q,Z}MAGIC, there is padding to make the data segment start
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on a page boundary. Most of the time the a_text field (and thus
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N_TXTSIZE) already contains this padding. But if it doesn't (I
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think maybe this happens on BSDI and/or 386BSD), then add it. */
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/* For {Q,Z}MAGIC, there is padding to make the data segment start on
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a page boundary. Most of the time the a_text field (and thus
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N_TXTSIZE) already contains this padding. It is possible that for
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BSDI and/or 386BSD it sometimes doesn't contain the padding, and
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perhaps we should be adding it here. But this seems kind of
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questionable and probably should be BSDI/386BSD-specific if we do
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do it.
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For NMAGIC (at least for hp300 BSD, probably others), there is
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padding in memory only, not on disk, so we must *not* ever pad here
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for NMAGIC. */
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#ifndef N_DATOFF
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#define N_DATOFF(x) \
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(N_MAGIC(x) == OMAGIC ? N_TXTOFF(x) + N_TXTSIZE(x) : \
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PAGE_SIZE + ((N_TXTOFF(x) + N_TXTSIZE(x) - 1) & ~(PAGE_SIZE - 1)))
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(N_TXTOFF(x) + N_TXTSIZE(x))
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#endif
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#ifndef N_TRELOFF
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@ -263,6 +287,17 @@ struct internal_nlist {
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#define N_WARNING 0x1e
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/* Weak symbols. These are a GNU extension to the a.out format. The
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semantics are those of ELF weak symbols. Weak symbols are always
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externally visible. The N_WEAK? values are squeezed into the
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available slots. The value of a N_WEAKU symbol is 0. The values
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of the other types are the definitions. */
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#define N_WEAKU 0x0d /* Weak undefined symbol. */
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#define N_WEAKA 0x0e /* Weak absolute symbol. */
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#define N_WEAKT 0x0f /* Weak text symbol. */
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#define N_WEAKD 0x10 /* Weak data symbol. */
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#define N_WEAKB 0x11 /* Weak bss symbol. */
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/* Relocations
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There are two types of relocation flavours for a.out systems,
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@ -286,25 +321,25 @@ struct reloc_std_external {
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bfd_byte r_type[1]; /* relocation type */
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};
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#define RELOC_STD_BITS_PCREL_BIG 0x80
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#define RELOC_STD_BITS_PCREL_LITTLE 0x01
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#define RELOC_STD_BITS_PCREL_BIG ((unsigned int) 0x80)
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#define RELOC_STD_BITS_PCREL_LITTLE ((unsigned int) 0x01)
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#define RELOC_STD_BITS_LENGTH_BIG 0x60
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#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
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#define RELOC_STD_BITS_LENGTH_LITTLE 0x06
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#define RELOC_STD_BITS_LENGTH_BIG ((unsigned int) 0x60)
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#define RELOC_STD_BITS_LENGTH_SH_BIG 5
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#define RELOC_STD_BITS_LENGTH_LITTLE ((unsigned int) 0x06)
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#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
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#define RELOC_STD_BITS_EXTERN_BIG 0x10
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#define RELOC_STD_BITS_EXTERN_LITTLE 0x08
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#define RELOC_STD_BITS_EXTERN_BIG ((unsigned int) 0x10)
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#define RELOC_STD_BITS_EXTERN_LITTLE ((unsigned int) 0x08)
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#define RELOC_STD_BITS_BASEREL_BIG 0x08
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#define RELOC_STD_BITS_BASEREL_LITTLE 0x10
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#define RELOC_STD_BITS_BASEREL_BIG ((unsigned int) 0x08)
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#define RELOC_STD_BITS_BASEREL_LITTLE ((unsigned int) 0x10)
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#define RELOC_STD_BITS_JMPTABLE_BIG 0x04
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#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
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#define RELOC_STD_BITS_JMPTABLE_BIG ((unsigned int) 0x04)
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#define RELOC_STD_BITS_JMPTABLE_LITTLE ((unsigned int) 0x20)
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#define RELOC_STD_BITS_RELATIVE_BIG 0x02
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#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
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#define RELOC_STD_BITS_RELATIVE_BIG ((unsigned int) 0x02)
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#define RELOC_STD_BITS_RELATIVE_LITTLE ((unsigned int) 0x40)
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#define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */
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@ -346,12 +381,12 @@ struct reloc_ext_external {
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bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */
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};
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#define RELOC_EXT_BITS_EXTERN_BIG 0x80
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#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
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#define RELOC_EXT_BITS_EXTERN_BIG ((unsigned int) 0x80)
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#define RELOC_EXT_BITS_EXTERN_LITTLE ((unsigned int) 0x01)
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#define RELOC_EXT_BITS_TYPE_BIG 0x1F
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#define RELOC_EXT_BITS_TYPE_BIG ((unsigned int) 0x1F)
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#define RELOC_EXT_BITS_TYPE_SH_BIG 0
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#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
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#define RELOC_EXT_BITS_TYPE_LITTLE ((unsigned int) 0xF8)
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#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
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/* Bytes per relocation entry */
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