linux-kernel - [PATCH 5.12 140/292] ARM: 9087/1: kprobes: test-thumb: fix for LLVM

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Date:   Mon, 19 Jul 2021 16:53:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nick Desaulniers <ndesaulniers@...gle.com>,
        Jian Cai <jiancai@...gle.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 140/292] ARM: 9087/1: kprobes: test-thumb: fix for LLVM_IAS=1

From: Nick Desaulniers <ndesaulniers@...gle.com>

[ Upstream commit 8b95a7d90ce8160ac5cffd5bace6e2eba01a871e ]

There's a few instructions that GAS infers operands but Clang doesn't;
from what I can tell the Arm ARM doesn't say these are optional.

F5.1.257 TBB, TBH T1 Halfword variant
F5.1.238 STREXD T1 variant
F5.1.84 LDREXD T1 variant

Link: https://github.com/ClangBuiltLinux/linux/issues/1309

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Jian Cai <jiancai@...gle.com>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/probes/kprobes/test-thumb.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/probes/kprobes/test-thumb.c b/arch/arm/probes/kprobes/test-thumb.c
index 456c181a7bfe..4e11f0b760f8 100644
--- a/arch/arm/probes/kprobes/test-thumb.c
+++ b/arch/arm/probes/kprobes/test-thumb.c
@@ -441,21 +441,21 @@ void kprobe_thumb32_test_cases(void)
 		"3:	mvn	r0, r0	\n\t"
 		"2:	nop		\n\t")
 
-	TEST_RX("tbh	[pc, r",7, (9f-(1f+4))>>1,"]",
+	TEST_RX("tbh	[pc, r",7, (9f-(1f+4))>>1,", lsl #1]",
 		"9:			\n\t"
 		".short	(2f-1b-4)>>1	\n\t"
 		".short	(3f-1b-4)>>1	\n\t"
 		"3:	mvn	r0, r0	\n\t"
 		"2:	nop		\n\t")
 
-	TEST_RX("tbh	[pc, r",12, ((9f-(1f+4))>>1)+1,"]",
+	TEST_RX("tbh	[pc, r",12, ((9f-(1f+4))>>1)+1,", lsl #1]",
 		"9:			\n\t"
 		".short	(2f-1b-4)>>1	\n\t"
 		".short	(3f-1b-4)>>1	\n\t"
 		"3:	mvn	r0, r0	\n\t"
 		"2:	nop		\n\t")
 
-	TEST_RRX("tbh	[r",1,9f, ", r",14,1,"]",
+	TEST_RRX("tbh	[r",1,9f, ", r",14,1,", lsl #1]",
 		"9:			\n\t"
 		".short	(2f-1b-4)>>1	\n\t"
 		".short	(3f-1b-4)>>1	\n\t"
@@ -468,10 +468,10 @@ void kprobe_thumb32_test_cases(void)
 
 	TEST_UNSUPPORTED("strexb	r0, r1, [r2]")
 	TEST_UNSUPPORTED("strexh	r0, r1, [r2]")
-	TEST_UNSUPPORTED("strexd	r0, r1, [r2]")
+	TEST_UNSUPPORTED("strexd	r0, r1, r2, [r2]")
 	TEST_UNSUPPORTED("ldrexb	r0, [r1]")
 	TEST_UNSUPPORTED("ldrexh	r0, [r1]")
-	TEST_UNSUPPORTED("ldrexd	r0, [r1]")
+	TEST_UNSUPPORTED("ldrexd	r0, r1, [r1]")
 
 	TEST_GROUP("Data-processing (shifted register) and (modified immediate)")
 
-- 
2.30.2