[edk2,v2,1/2] ArmPkg: add prebuilt glue binaries for GCC5 LTO support

Message ID 1468843755-6248-1-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel July 18, 2016, 12:09 p.m.
GCC in LTO mode interoperates poorly with non-standard libraries that
provide implementations of compiler intrinsics such as memcpy/memset
or the stack protector entry points. Such libraries need to be built
in non-LTO mode, and then referenced explicitly on the linker command
line using a -plugin-opt=-pass-through=-lxxx linker option.

However, if these intrinsics are also referenced directly, the LTO
version of the code will be pulled in, and will happily satisfy all
other references to the same symbol.

So add a pair of glue libraries, for ARM and AARCH64, that reference
the known intrinsics. Since the binaries live under ArmPkg directly,
we can reference them in tools_def.txt. Under LD garbage collection,
the object itself will be pruned, and so will the intrinsics that end
up unused by the module.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 ArmPkg/GccLto/liblto-aarch64.a | Bin 0 -> 1016 bytes
 ArmPkg/GccLto/liblto-aarch64.s |  15 ++++++
 ArmPkg/GccLto/liblto-arm.a     | Bin 0 -> 2096 bytes
 ArmPkg/GccLto/liblto-arm.s     |  49 ++++++++++++++++++++
 4 files changed, 64 insertions(+)

-- 
2.7.4

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Patch

diff --git a/ArmPkg/GccLto/liblto-aarch64.a b/ArmPkg/GccLto/liblto-aarch64.a
new file mode 100644
index 0000000000000000000000000000000000000000..2ab00238f0dad882abf08a1fb9623c9cdea9f17b
GIT binary patch
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diff --git a/ArmPkg/GccLto/liblto-aarch64.s b/ArmPkg/GccLto/liblto-aarch64.s
new file mode 100644
index 000000000000..1215858edd43
--- /dev/null
+++ b/ArmPkg/GccLto/liblto-aarch64.s
@@ -0,0 +1,15 @@ 
+//
+// GCC in LTO mode interoperates poorly with non-standard libraries that
+// provide implementations of compiler intrinsics such as memcpy/memset
+// or the stack protector entry points.
+//
+// By referencing these functions from a non-LTO object that can be passed
+// to the linker via the -plugin-opt=-pass-through=-lxxx options, the
+// intrinsics are included in the link in a way that allows them to be
+// pruned again if no other references to them exist.
+//
+
+	.long	memcpy - .
+	.long	memset - .
+	.long	__stack_chk_fail - .
+	.long	__stack_chk_guard - .
diff --git a/ArmPkg/GccLto/liblto-arm.a b/ArmPkg/GccLto/liblto-arm.a
new file mode 100644
index 0000000000000000000000000000000000000000..d811c09573a35ea87a8002ecf01be18e1c6e7fd3
GIT binary patch
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literal 0
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diff --git a/ArmPkg/GccLto/liblto-arm.s b/ArmPkg/GccLto/liblto-arm.s
new file mode 100644
index 000000000000..48c682f92e08
--- /dev/null
+++ b/ArmPkg/GccLto/liblto-arm.s
@@ -0,0 +1,49 @@ 
+//
+// GCC in LTO mode interoperates poorly with non-standard libraries that
+// provide implementations of compiler intrinsics such as memcpy/memset
+// or the stack protector entry points.
+//
+// By referencing these functions from a non-LTO object that can be passed
+// to the linker via the -plugin-opt=-pass-through=-lxxx options, the
+// intrinsics are included in the link in a way that allows them to be
+// pruned again if no other references to them exist.
+//
+
+	.long	memcpy - .
+	.long	memset - .
+	.long	__stack_chk_fail - .
+	.long	__stack_chk_guard - .
+	.long __ashrdi3 - .
+	.long __ashldi3 - .
+	.long __aeabi_idiv - .
+	.long __aeabi_idivmod - .
+	.long __aeabi_uidiv - .
+	.long __aeabi_uidivmod - .
+	.long __divdi3 - .
+	.long __divsi3 - .
+	.long __lshrdi3 - .
+	.long __aeabi_memcpy - .
+	.long __aeabi_memset - .
+	.long memmove - .
+	.long __modsi3 - .
+	.long __moddi3 - .
+	.long __muldi3 - .
+	.long __aeabi_lmul - .
+	.long __ARM_ll_mullu - .
+	.long __udivsi3 - .
+	.long __umodsi3 - .
+	.long __udivdi3 - .
+	.long __umoddi3 - .
+	.long __udivmoddi4 - .
+	.long __clzsi2 - .
+	.long __ctzsi2 - .
+	.long __ucmpdi2 - .
+	.long __switch8 - .
+	.long __switchu8 - .
+	.long __switch16 - .
+	.long __switch32 - .
+	.long __aeabi_ulcmp - .
+	.long __aeabi_uldivmod - .
+	.long __aeabi_ldivmod - .
+	.long __aeabi_llsr - .
+	.long __aeabi_llsl - .