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.

diff --git a/include/aout/ChangeLog b/include/aout/ChangeLog
index 2b3382474c2f634a18766855bf81dcdfd55abf03..1519efbc08bbc9e47f13ad86ca91f60638582b7d 100644 (file)
--- a/include/aout/ChangeLog
+++ b/include/aout/ChangeLog
@@ -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)
 
        * 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
        devo/include directory
 
-
-       
-
+\f
+Local Variables:
+version-control: never
+End:

diff --git a/include/aout/aout64.h b/include/aout/aout64.h
index 8f61377bbea1bc3f6bed927dd538ff209ade0a50..f96f856172983edb014245c8a1a8588eaeb985fe 100644 (file)
--- a/include/aout/aout64.h
+++ b/include/aout/aout64.h
@@ -38,7 +38,7 @@ struct external_exec
 #define ZMAGIC 0413            /* Code indicating demand-paged executable.  */
 
 /* 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
 # ifndef N_BADMAG
 #  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)
 #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
 #define N_TXTADDR(x) \
     (/* The address of a QMAGIC file is always one page in, */ \
@@ -134,6 +139,19 @@ struct external_exec
     )
 #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. */
 #ifndef N_TXTOFF
 #define N_TXTOFF(x)    \
@@ -142,7 +160,7 @@ struct external_exec
      N_SHARED_LIB(x) ? 0 : \
      N_HEADER_IN_TEXT(x) ?     \
            EXEC_BYTES_SIZE :                   /* no padding */\
-           PAGE_SIZE                           /* a page of padding */\
+           ZMAGIC_DISK_BLOCK_SIZE              /* a page of padding */\
     )
 #endif
 /* 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.  */
 
-/* For {N,Q,Z}MAGIC, there is padding to make the data segment start
-   on 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
-   think maybe this happens on BSDI and/or 386BSD), then add it.  */
+/* For {Q,Z}MAGIC, there is padding to make the data segment start on
+   a page boundary.  Most of the time the a_text field (and thus
+   N_TXTSIZE) already contains this padding.  It is possible that for
+   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
 #define N_DATOFF(x) \
- (N_MAGIC(x) == OMAGIC ? N_TXTOFF(x) + N_TXTSIZE(x) : \
-  PAGE_SIZE + ((N_TXTOFF(x) + N_TXTSIZE(x) - 1) & ~(PAGE_SIZE - 1)))
+ (N_TXTOFF(x) + N_TXTSIZE(x))
 #endif
 
 #ifndef N_TRELOFF
@@ -263,6 +287,17 @@ struct internal_nlist {
 
 #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 
 
   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                      */
 };
 
-#define        RELOC_STD_BITS_PCREL_BIG        0x80
-#define        RELOC_STD_BITS_PCREL_LITTLE     0x01
+#define        RELOC_STD_BITS_PCREL_BIG        ((unsigned int) 0x80)
+#define        RELOC_STD_BITS_PCREL_LITTLE     ((unsigned int) 0x01)
 
-#define        RELOC_STD_BITS_LENGTH_BIG       0x60
-#define        RELOC_STD_BITS_LENGTH_SH_BIG    5       /* To shift to units place */
-#define        RELOC_STD_BITS_LENGTH_LITTLE    0x06
+#define        RELOC_STD_BITS_LENGTH_BIG       ((unsigned int) 0x60)
+#define        RELOC_STD_BITS_LENGTH_SH_BIG    5
+#define        RELOC_STD_BITS_LENGTH_LITTLE    ((unsigned int) 0x06)
 #define        RELOC_STD_BITS_LENGTH_SH_LITTLE 1
 
-#define        RELOC_STD_BITS_EXTERN_BIG       0x10
-#define        RELOC_STD_BITS_EXTERN_LITTLE    0x08
+#define        RELOC_STD_BITS_EXTERN_BIG       ((unsigned int) 0x10)
+#define        RELOC_STD_BITS_EXTERN_LITTLE    ((unsigned int) 0x08)
 
-#define        RELOC_STD_BITS_BASEREL_BIG      0x08
-#define        RELOC_STD_BITS_BASEREL_LITTLE   0x10
+#define        RELOC_STD_BITS_BASEREL_BIG      ((unsigned int) 0x08)
+#define        RELOC_STD_BITS_BASEREL_LITTLE   ((unsigned int) 0x10)
 
-#define        RELOC_STD_BITS_JMPTABLE_BIG     0x04
-#define        RELOC_STD_BITS_JMPTABLE_LITTLE  0x04
+#define        RELOC_STD_BITS_JMPTABLE_BIG     ((unsigned int) 0x04)
+#define        RELOC_STD_BITS_JMPTABLE_LITTLE  ((unsigned int) 0x20)
 
-#define        RELOC_STD_BITS_RELATIVE_BIG     0x02
-#define        RELOC_STD_BITS_RELATIVE_LITTLE  0x02
+#define        RELOC_STD_BITS_RELATIVE_BIG     ((unsigned int) 0x02)
+#define        RELOC_STD_BITS_RELATIVE_LITTLE  ((unsigned int) 0x40)
 
 #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                         */
 };
 
-#define        RELOC_EXT_BITS_EXTERN_BIG       0x80
-#define        RELOC_EXT_BITS_EXTERN_LITTLE    0x01
+#define        RELOC_EXT_BITS_EXTERN_BIG       ((unsigned int) 0x80)
+#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_LITTLE      0xF8
+#define        RELOC_EXT_BITS_TYPE_LITTLE      ((unsigned int) 0xF8)
 #define        RELOC_EXT_BITS_TYPE_SH_LITTLE   3
 
 /* Bytes per relocation entry */