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authorJon Medhurst <tixy@linaro.org>2015-01-19 15:15:36 +0000
committerJon Medhurst <tixy@linaro.org>2015-01-20 09:06:04 +0000
commitfb892bd0fdcb2e5eac9c105cf68def90396ed8cc (patch)
tree193a2dd316d64e90705032e9870a7848d1be7b07 /arch/arm/probes
parentbfc9657d752c47d59dc0bab85ebdc19cf60100dd (diff)
downloadop-kernel-dev-fb892bd0fdcb2e5eac9c105cf68def90396ed8cc.zip
op-kernel-dev-fb892bd0fdcb2e5eac9c105cf68def90396ed8cc.tar.gz
ARM: kprobes: Eliminate test code's use of BX instruction on ARMv4 CPUs
Non-T variants of ARMv4 CPUs don't support the BX instruction so eliminate its use. Signed-off-by: Jon Medhurst <tixy@linaro.org>
Diffstat (limited to 'arch/arm/probes')
-rw-r--r--arch/arm/probes/kprobes/test-arm.c3
-rw-r--r--arch/arm/probes/kprobes/test-core.c10
2 files changed, 10 insertions, 3 deletions
diff --git a/arch/arm/probes/kprobes/test-arm.c b/arch/arm/probes/kprobes/test-arm.c
index e72b07e..8866aed 100644
--- a/arch/arm/probes/kprobes/test-arm.c
+++ b/arch/arm/probes/kprobes/test-arm.c
@@ -215,9 +215,12 @@ void kprobe_arm_test_cases(void)
TEST_UNSUPPORTED("msr cpsr_f, lr")
TEST_UNSUPPORTED("msr spsr, r0")
+#if __LINUX_ARM_ARCH__ >= 5 || \
+ (__LINUX_ARM_ARCH__ == 4 && !defined(CONFIG_CPU_32v4))
TEST_BF_R("bx r",0,2f,"")
TEST_BB_R("bx r",7,2f,"")
TEST_BF_R("bxeq r",14,2f,"")
+#endif
#if __LINUX_ARM_ARCH__ >= 5
TEST_R("clz r0, r",0, 0x0,"")
diff --git a/arch/arm/probes/kprobes/test-core.c b/arch/arm/probes/kprobes/test-core.c
index e495127..9775de2 100644
--- a/arch/arm/probes/kprobes/test-core.c
+++ b/arch/arm/probes/kprobes/test-core.c
@@ -236,6 +236,8 @@ static int tests_failed;
#ifndef CONFIG_THUMB2_KERNEL
+#define RET(reg) "mov pc, "#reg
+
long arm_func(long r0, long r1);
static void __used __naked __arm_kprobes_test_func(void)
@@ -245,7 +247,7 @@ static void __used __naked __arm_kprobes_test_func(void)
".type arm_func, %%function \n\t"
"arm_func: \n\t"
"adds r0, r0, r1 \n\t"
- "bx lr \n\t"
+ "mov pc, lr \n\t"
".code "NORMAL_ISA /* Back to Thumb if necessary */
: : : "r0", "r1", "cc"
);
@@ -253,6 +255,8 @@ static void __used __naked __arm_kprobes_test_func(void)
#else /* CONFIG_THUMB2_KERNEL */
+#define RET(reg) "bx "#reg
+
long thumb16_func(long r0, long r1);
long thumb32even_func(long r0, long r1);
long thumb32odd_func(long r0, long r1);
@@ -494,7 +498,7 @@ static void __naked benchmark_nop(void)
{
__asm__ __volatile__ (
"nop \n\t"
- "bx lr"
+ RET(lr)" \n\t"
);
}
@@ -977,7 +981,7 @@ void __naked __kprobes_test_case_start(void)
"bic r0, lr, #1 @ r0 = inline data \n\t"
"mov r1, sp \n\t"
"bl kprobes_test_case_start \n\t"
- "bx r0 \n\t"
+ RET(r0)" \n\t"
);
}
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