toolchain/gcc/patches/3.4.6/800-arm-bigendian.patch

   1 By Lennert Buytenhek <buytenh@wantstofly.org>
   2 Adds support for arm*b-linux* big-endian ARM targets
   3
   4 See http://gcc.gnu.org/PR16350
   5
   6 --- a/gcc/config/arm/linux-elf.h
   7 +++ b/gcc/config/arm/linux-elf.h
   8 @@ -30,17 +30,34 @@
   9  /* Do not assume anything about header files.  */
  10  #define NO_IMPLICIT_EXTERN_C
  11
  12 +/*
  13 + * 'config.gcc' defines TARGET_BIG_ENDIAN_DEFAULT as 1 for arm*b-*
  14 + * (big endian) configurations.
  15 + */
  16 +#if TARGET_BIG_ENDIAN_DEFAULT
  17 +#define TARGET_ENDIAN_DEFAULT ARM_FLAG_BIG_END
  18 +#define TARGET_ENDIAN_OPTION "mbig-endian"
  19 +#define TARGET_LINKER_EMULATION "armelfb_linux"
  20 +#else
  21 +#define TARGET_ENDIAN_DEFAULT 0
  22 +#define TARGET_ENDIAN_OPTION "mlittle-endian"
  23 +#define TARGET_LINKER_EMULATION "armelf_linux"
  24 +#endif
  25 +
  26  /* Default is to use APCS-32 mode.  */
  27  #undef  TARGET_DEFAULT
  28 -#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_MMU_TRAPS)
  29 +#define TARGET_DEFAULT \
  30 +               ( ARM_FLAG_APCS_32 | \
  31 +                 ARM_FLAG_MMU_TRAPS | \
  32 +                 TARGET_ENDIAN_DEFAULT )
  33
  34  #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  35
  36 -#define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
  37 +#define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
  38
  39  #undef  MULTILIB_DEFAULTS
  40  #define MULTILIB_DEFAULTS \
  41 -       { "marm", "mlittle-endian", "mhard-float", "mapcs-32", "mno-thumb-interwork" }
  42 +       { "marm", TARGET_ENDIAN_OPTION, "mhard-float", "mapcs-32", "mno-thumb-interwork" }
  43
  44  #define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
  45
  46 @@ -101,7 +118,7 @@
  47     %{rdynamic:-export-dynamic} \
  48     %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
  49     -X \
  50 -   %{mbig-endian:-EB}" \
  51 +   %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
  52     SUBTARGET_EXTRA_LINK_SPEC
  53  #endif
  54
  55 --- a/gcc/config.gcc
  56 +++ b/gcc/config.gcc
  57 @@ -684,6 +684,11 @@ arm*-*-linux-uclibc*)              # ARM GNU/Linux w
  58         ;;
  59  arm*-*-linux*)                 # ARM GNU/Linux with ELF
  60         tm_file="dbxelf.h elfos.h linux.h arm/elf.h  arm/linux-gas.h arm/linux-elf.h arm/aout.h arm/arm.h"
  61 +       case $target in
  62 +       arm*b-*)
  63 +               tm_defines="TARGET_BIG_ENDIAN_DEFAULT=1 $tm_defines"
  64 +               ;;
  65 +       esac
  66         tmake_file="t-slibgcc-elf-ver t-linux arm/t-linux"
  67         extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
  68         gnu_ld=yes