800-arm-bigendian.patch

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

By Lennert Buytenhek <[e-mail]>
Adds support for arm*b-linux* big-endian ARM targets

See http://gcc.gnu.org/PR16350

--- gcc-4.0.3/gcc/config/arm/linux-elf.h
+++ gcc-4.0.3/gcc/config/arm/linux-elf.h
@@ -31,19 +31,33 @@
 /* Do not assume anything about header files.  */
 #define NO_IMPLICIT_EXTERN_C
 
+/*
+ * 'config.gcc' defines TARGET_BIG_ENDIAN_DEFAULT as 1 for arm*b-*
+ * (big endian) configurations.
+ */
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define TARGET_ENDIAN_DEFAULT ARM_FLAG_BIG_END
+#define TARGET_ENDIAN_OPTION "mbig-endian"
+#define TARGET_LINKER_EMULATION "armelfb_linux"
+#else
+#define TARGET_ENDIAN_DEFAULT 0
+#define TARGET_ENDIAN_OPTION "mlittle-endian"
+#define TARGET_LINKER_EMULATION "armelf_linux"
+#endif
+
 #undef  TARGET_DEFAULT_FLOAT_ABI
 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
 
 #undef  TARGET_DEFAULT
-#define TARGET_DEFAULT (0)
+#define TARGET_DEFAULT (TARGET_ENDIAN_DEFAULT)
 
 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
 
-#define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
+#define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
 
 #undef  MULTILIB_DEFAULTS
 #define MULTILIB_DEFAULTS \
-	{ "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
+	{ "marm", TARGET_ENDIAN_OPTION, "mhard-float", "mno-thumb-interwork" }
 
 /* The GNU C++ standard library requires that these macros be defined.  */
 #undef CPLUSPLUS_CPP_SPEC
@@ -90,7 +104,7 @@
    %{rdynamic:-export-dynamic} \
    %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
    -X \
-   %{mbig-endian:-EB}" \
+   %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
    SUBTARGET_EXTRA_LINK_SPEC
 
 #define TARGET_OS_CPP_BUILTINS()		\
--- gcc-4.0.3/gcc/config.gcc
+++ gcc-4.0.3/gcc/config.gcc
@@ -672,6 +672,11 @@
 	;;
 arm*-*-linux*)			# ARM GNU/Linux with ELF
 	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"
+	case $target in
+	arm*b-*)
+		tm_defines="TARGET_BIG_ENDIAN_DEFAULT=1 $tm_defines"
+		;;
+	esac
 	tmake_file="${tmake_file} arm/t-arm arm/t-linux"
 	extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
 	gnu_ld=yes