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[google/gcc-4_7] Backport arm hardfp patch from trunk
- From: Han Shen(ææ) <shenhan at google dot com>
- To: Guozhi Wei <carrot at google dot com>, gcc-patches at gcc dot gnu dot org
- Cc: Ahmad Sharif <asharif at google dot com>, Jing Yu <jingyu at google dot com>, Diego Novillo <dnovillo at google dot com>, Caroline Tice <cmtice at google dot com>, Luis Lozano <llozano at google dot com>, Yunlian Jiang <yunlian at google dot com>
- Date: Mon, 13 Aug 2012 16:14:12 -0700
- Subject: [google/gcc-4_7] Backport arm hardfp patch from trunk
Hi Carrot, could you take a look at this patch? Thanks!
The modification is in upstream trunk patch revision - 186859.
The same patch has been back ported to google/gcc-4_6
(http://codereview.appspot.com/6206055/), this is to apply on
google/gcc-4_7
Regards,
-Han
2012-08-13 Han Shen <shenhan@google.com>
Backport from mainline.
2012-05-01 Richard Earnshaw <rearnsha@arm.com>
* arm/linux-eabi.h (GLIBC_DYNAMIC_LINKER_DEFAULT): Avoid ifdef
comparing enumeration values. Update comments.
2012-04-26 Michael Hope <michael.hope@linaro.org>
Richard Earnshaw <rearnsha@arm.com>
* config/arm/linux-eabi.h (GLIBC_DYNAMIC_LINKER_SOFT_FLOAT): Define.
(GLIBC_DYNAMIC_LINKER_HARD_FLOAT): Define.
(GLIBC_DYNAMIC_LINKER_DEFAULT): Define.
(GLIBC_DYNAMIC_LINKER): Redefine to use the hard float path.
diff --git a/gcc/config/arm/linux-eabi.h b/gcc/config/arm/linux-eabi.h
index c0cfde3..142054f 100644
--- a/gcc/config/arm/linux-eabi.h
+++ b/gcc/config/arm/linux-eabi.h
@@ -32,7 +32,8 @@
while (false)
/* We default to a soft-float ABI so that binaries can run on all
- target hardware. */
+ target hardware. If you override this to use the hard-float ABI then
+ change the setting of GLIBC_DYNAMIC_LINKER_DEFAULT as well. */
#undef TARGET_DEFAULT_FLOAT_ABI
#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
@@ -59,10 +60,25 @@
#undef SUBTARGET_EXTRA_LINK_SPEC
#define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION
-/* Use ld-linux.so.3 so that it will be possible to run "classic"
- GNU/Linux binaries on an EABI system. */
+/* GNU/Linux on ARM currently supports three dynamic linkers:
+ - ld-linux.so.2 - for the legacy ABI
+ - ld-linux.so.3 - for the EABI-derived soft-float ABI
+ - ld-linux-armhf.so.3 - for the EABI-derived hard-float ABI.
+ All the dynamic linkers live in /lib.
+ We default to soft-float, but this can be overridden by changing both
+ GLIBC_DYNAMIC_LINKER_DEFAULT and TARGET_DEFAULT_FLOAT_ABI. */
+
#undef GLIBC_DYNAMIC_LINKER
-#define GLIBC_DYNAMIC_LINKER RUNTIME_ROOT_PREFIX "/lib/ld-linux.so.3"
+#define GLIBC_DYNAMIC_LINKER_SOFT_FLOAT \
+ RUNTIME_ROOT_PREFIX "/lib/ld-linux.so.3"
+#define GLIBC_DYNAMIC_LINKER_HARD_FLOAT \
+ RUNTIME_ROOT_PREFIX "/lib/ld-linux-armhf.so.3"
+#define GLIBC_DYNAMIC_LINKER_DEFAULT GLIBC_DYNAMIC_LINKER_SOFT_FLOAT
+
+#define GLIBC_DYNAMIC_LINKER \
+ "%{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \
+ %{mfloat-abi=soft*:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "} \
+ %{!mfloat-abi=*:" GLIBC_DYNAMIC_LINKER_DEFAULT "}"
/* At this point, bpabi.h will have clobbered LINK_SPEC. We want to
use the GNU/Linux version, not the generic BPABI version. */