PATCH: put .sdata2/.sbss2 into the writable segment on vxworks ppc

[Tristan Gingold]

Hi,

on VxWorks 6 (for powerpc) all the .sdata2 sections of the library  
are flagged RW.
Therefore during the final link (in RTP mode) the corresponding  
segment must be RW.
Currently these sections are always put into the RX segment by the  
linker script.  As a consequence
this segment becomes RWX which is unfortunate.

This patch fixes this issue by adding a new variable: WRITABLE_SDATA2.

Tristan.

ld:
2007-10-11  Tristan Gingold  <gingold@adacore.com>

	* scripttempl/elf.sc: If WRITABLE_SDATA2 is set, put .sdata2 and
	.sbss2 sections into the writable segment.

	* emulparams/elf32ppcvxworks.sh (WRITABLE_SDATA2): Defined.

*** ld/emulparams/elf32ppcvxworks.sh    2 Mar 2006 08:50:04  
-0000       1.2
--- ld/emulparams/elf32ppcvxworks.sh    23 Oct 2007 16:07:57 -0000
***************
*** 1,3 ****
--- 1,4 ----
   . ${srcdir}/emulparams/elf32ppccommon.sh
   OUTPUT_FORMAT="elf32-powerpc-vxworks"
+ WRITABLE_SDATA2=
   . ${srcdir}/emulparams/vxworks.sh


*** ld/scripttempl/elf.sc       27 Jul 2007 22:33:24 -0000      1.83
--- ld/scripttempl/elf.sc       23 Oct 2007 16:07:58 -0000
***************
*** 3,8 ****
--- 3,9 ----
   #     NOP - four byte opcode for no-op (defaults to 0)
   #     NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not
   #             empty.
+ #     WRITABLE_SDATA2 - if set, the .sdata2/.sbss2 sections should  
be writable
   #     SMALL_DATA_CTOR - .ctors contains small data.
   #     SMALL_DATA_DTOR - .dtors contains small data.
   #     DATA_ADDR - if end-of-text-plus-one-page isn't right for  
data start
***************
*** 366,373 ****
     ${RELOCATING+PROVIDE (${ETEXT_NAME} = .);}
     ${WRITABLE_RODATA-${RODATA}}
     .rodata1      ${RELOCATING-0} : { *(.rodata1) }
!   ${CREATE_SHLIB-${SDATA2}}
!   ${CREATE_SHLIB-${SBSS2}}
     ${OTHER_READONLY_SECTIONS}
     .eh_frame_hdr : { *(.eh_frame_hdr) }
     .eh_frame     ${RELOCATING-0} : ONLY_IF_RO { KEEP (*(.eh_frame)) }
--- 367,374 ----
     ${RELOCATING+PROVIDE (${ETEXT_NAME} = .);}
     ${WRITABLE_RODATA-${RODATA}}
     .rodata1      ${RELOCATING-0} : { *(.rodata1) }
!   ${CREATE_SHLIB-${WRITABLE_SDATA2-${SDATA2}}}
!   ${CREATE_SHLIB-${WRITABLE_SDATA2-${SBSS2}}}
     ${OTHER_READONLY_SECTIONS}
     .eh_frame_hdr : { *(.eh_frame_hdr) }
     .eh_frame     ${RELOCATING-0} : ONLY_IF_RO { KEEP (*(.eh_frame)) }
***************
*** 432,437 ****
--- 433,440 ----
     }
     .data1        ${RELOCATING-0} : { *(.data1) }
     ${WRITABLE_RODATA+${RODATA}}
+   ${CREATE_SHLIB-${WRITABLE_SDATA2+${SDATA2}}}
+   ${CREATE_SHLIB-${WRITABLE_SDATA2+${SBSS2}}}
     ${OTHER_READWRITE_SECTIONS}
     ${SMALL_DATA_CTOR+${RELOCATING+${CTOR}}}
     ${SMALL_DATA_DTOR+${RELOCATING+${DTOR}}}