From: Taras Kondratiuk <taras.kondratiuk@linaro.org>
Date: Fri, 8 Nov 2013 18:29:29 +0000 (+0000)
Subject: ARM: kprobes-test: Workaround GAS .align bug
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=41b5368f31f86a1c2be2bb16a1cf18d23f1223d4;p=linux.git

ARM: kprobes-test: Workaround GAS .align bug

By default if no fill symbol is given to .align directive in a code
section it fills gap with NOPs. If previous fragment is not
instruction-aligned, additional pre-alignment is done by zero bytes
before NOPs. These zero bytes are marked as data by special symbol $d in
symbol table. Unfortunately GAS assumes that there is only code in the
code section so it "puts back" code symbol $a at the end of this
pre-alignment. So if there is some data after alignment it will be
interpreted as code and will be swapped back to LE for BE8 system during
a final linking.

If explicit fill value is given to .align, the NOP-padding code is
skipped and symbol table does not get messed-up.

So the workaround for this issue:
Use explicit fill value if data should be aligned in the code section.

Acked-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@linaro.org>
---

diff --git a/arch/arm/kernel/kprobes-test.c b/arch/arm/kernel/kprobes-test.c
index 6e60a349aed92..379639998d5a8 100644
--- a/arch/arm/kernel/kprobes-test.c
+++ b/arch/arm/kernel/kprobes-test.c
@@ -113,7 +113,7 @@
  *	@ start of inline data...
  *	.ascii "mov r0, r7"	@ text title for test case
  *	.byte	0
- *	.align	2
+ *	.align	2, 0
  *
  *	@ TEST_ARG_REG
  *	.byte	ARG_TYPE_REG
diff --git a/arch/arm/kernel/kprobes-test.h b/arch/arm/kernel/kprobes-test.h
index e28a869b1ae4b..eecc90a0fd912 100644
--- a/arch/arm/kernel/kprobes-test.h
+++ b/arch/arm/kernel/kprobes-test.h
@@ -115,7 +115,7 @@ struct test_arg_end {
 	/* multiple strings to be concatenated.  */		\
 	".ascii "#title"				\n\t"	\
 	".byte	0					\n\t"	\
-	".align	2					\n\t"
+	".align	2, 0					\n\t"
 
 #define	TEST_ARG_REG(reg, val)					\
 	".byte	"__stringify(ARG_TYPE_REG)"		\n\t"	\