openwrt/toolchain/gcc/3.4.0/820-no-mips-empic-relocs.patch

   1 From: cgd at broadcom dot com
   2 To: gcc-patches at gcc dot gnu dot org
   3 Cc: mark at codesourcery dot com
   4 Date: 13 Jun 2004 22:51:30 -0700
   5 Subject: [trunk + 3.4-branch RFA] don't use empic relocs for mips-linuxeh
   6
   7 This patch changes mips-linux to avoid using embedded-pic relocs for
   8 its eh data.  (Support for generating these for new code is removed in
   9 current binutils srcs.)
  10
  11 Relating to this, previously, mips-linux and mips64-linux would use
  12 different representations for their EH data (even for mips64-linux o32
  13 abi), due to the mips64-linux n32/64 BFDs not supporting the
  14 embedded-pic relocs.  This was a bug.
  15
  16 For more explanation, see the thread of the URL quoted in the comment
  17 in linux.h.
  18
  19
  20 Tested the same w/ sources of about a week ago for c/c++ for
  21 mips-linux (native) before/after.  Also verified .o compatibility
  22 before/after just to be sure.
  23
  24 I'd like this approved for the branch as well, so 3.4.1 will work
  25 nicely w/ the next major binutils release.
  26
  27
  28 thanks,
  29
  30 chris
  31
  32 2004-06-13  Chris Demetriou  <cgd@broadcom.com>
  33
  34         * config/mips/linux.h (ASM_PREFERRED_EH_DATA_FORMAT): Redefine
  35         to return DW_EH_PE_absptr.
  36
  37 Index: config/mips/linux.h
  38 ===================================================================
  39 RCS file: /cvs/gcc/gcc/gcc/config/mips/linux.h,v
  40 retrieving revision 1.77
  41 diff -u -p -r1.77 linux.h
  42 --- gcc/gcc/config/mips/linux.h 19 Feb 2004 22:07:51 -0000      1.77
  43 +++ gcc/gcc/config/mips/linux.h 14 Jun 2004 05:49:51 -0000
  44 @@ -170,10 +170,11 @@ Boston, MA 02111-1307, USA.  */
  45  #undef FUNCTION_NAME_ALREADY_DECLARED
  46  #define FUNCTION_NAME_ALREADY_DECLARED 1
  47
  48 -#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                     \
  49 -  (flag_pic                                                            \
  50 -    ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
  51 -   : DW_EH_PE_absptr)
  52 +/* If possible, we should attempt to use GP-relative relocs for this
  53 +   (see <a  href="http://sources.redhat.com/ml/binutils/2004-05/msg00227.html">http://sources.redhat.com/ml/binutils/2004-05/msg00227.html</a>).
  54 +   However, until that is implement, this just uses standard, absolute
  55 +   references.  */
  56 +#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)     DW_EH_PE_absptr
  57
  58  /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
  59     it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the