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[RFC,14/16] arm64: crypto: Add exceptions for crypto object to prevent stack analysis

Message ID 20190516103655.5509-15-raphael.gault@arm.com (mailing list archive)
State RFC
Headers show
Series objtool: Add support for Arm64 | expand

Commit Message

Raphael Gault May 16, 2019, 10:36 a.m. UTC 
Some crypto modules contain `.word` of data in the .text section.
Since objtool can't make the distinction between data and incorrect
instruction, it gives a warning about the instruction beeing unknown
and stops the analysis of the object file.

The exception can be removed if the data are moved to another section
or if objtool is tweaked to handle this particular case.

Signed-off-by: Raphael Gault <raphael.gault@arm.com>
---
 arch/arm64/crypto/Makefile | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index e766daf43b7c..d9125e7d4546 100644
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -46,9 +46,11 @@  aes-neon-blk-y := aes-glue-neon.o aes-neon.o
 
 obj-$(CONFIG_CRYPTO_SHA256_ARM64) += sha256-arm64.o
 sha256-arm64-y := sha256-glue.o sha256-core.o
+OBJECT_FILES_NON_STANDARD_sha256-core.o := y
 
 obj-$(CONFIG_CRYPTO_SHA512_ARM64) += sha512-arm64.o
 sha512-arm64-y := sha512-glue.o sha512-core.o
+OBJECT_FILES_NON_STANDARD_sha512-core.o := y
 
 obj-$(CONFIG_CRYPTO_CHACHA20_NEON) += chacha-neon.o
 chacha-neon-y := chacha-neon-core.o chacha-neon-glue.o
@@ -61,6 +63,7 @@  aes-arm64-y := aes-cipher-core.o aes-cipher-glue.o
 
 obj-$(CONFIG_CRYPTO_AES_ARM64_BS) += aes-neon-bs.o
 aes-neon-bs-y := aes-neonbs-core.o aes-neonbs-glue.o
+OBJECT_FILES_NON_STANDARD_aes-neonbs-core.o := y
 
 CFLAGS_aes-glue-ce.o	:= -DUSE_V8_CRYPTO_EXTENSIONS