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-4.2.0/gcc/config/arm/linux-elf.h
+++ gcc-4.2.0/gcc/config/arm/linux-elf.h
@@ -28,19 +28,33 @@
 #undef  TARGET_VERSION
 #define TARGET_VERSION  fputs (" (ARM GNU/Linux with ELF)", stderr);
 
+/*
+ * 'config.gcc' defines TARGET_BIG_ENDIAN_DEFAULT as 1 for arm*b-*
+ * (big endian) configurations.
+ */
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define TARGET_ENDIAN_DEFAULT MASK_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" }
 
 /* Now we define the strings used to build the spec file.  */
 #undef  LIB_SPEC
@@ -61,7 +75,7 @@
    %{rdynamic:-export-dynamic} \
    %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER "} \
    -X \
-   %{mbig-endian:-EB}" \
+   %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
    SUBTARGET_EXTRA_LINK_SPEC
 
 #undef  LINK_SPEC
--- gcc-4.2.0/gcc/config.gcc.orig	2006-09-22 14:53:41.000000000 +0200
+++ gcc-4.2.0/gcc/config.gcc	2006-09-25 10:45:21.000000000 +0200
@@ -696,6 +696,11 @@
 	tm_file="dbxelf.h elfos.h linux.h arm/elf.h arm/linux-gas.h arm/linux-elf.h"
 	tmake_file="${tmake_file} t-linux arm/t-arm"
 	case ${target} in
+	arm*b-*)
+		tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"
+		;;
+	esac
+	case ${target} in
 	arm*-*-linux-*eabi)
 	    tm_file="$tm_file arm/bpabi.h arm/linux-eabi.h"
 	    tmake_file="$tmake_file arm/t-arm-elf arm/t-bpabi arm/t-linux-eabi"