[PATCH v4 5/5] powerpc/code-patching: Add boot selftest for data patching
Benjamin Gray
bgray at linux.ibm.com
Wed May 15 12:44:45 AEST 2024
Extend the code patching selftests with some basic coverage of the new
data patching variants too.
Signed-off-by: Benjamin Gray <bgray at linux.ibm.com>
---
v4: * Change store to a check
* Account for doubleword alignment
v3: * New in v3
---
arch/powerpc/lib/test-code-patching.c | 41 +++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/arch/powerpc/lib/test-code-patching.c b/arch/powerpc/lib/test-code-patching.c
index f76030087f98..8cd3b32f805b 100644
--- a/arch/powerpc/lib/test-code-patching.c
+++ b/arch/powerpc/lib/test-code-patching.c
@@ -438,6 +438,46 @@ static void __init test_multi_instruction_patching(void)
vfree(buf);
}
+static void __init test_data_patching(void)
+{
+ void *buf;
+ u32 *addr32;
+
+ buf = vzalloc(PAGE_SIZE);
+ check(buf);
+ if (!buf)
+ return;
+
+ addr32 = buf + 128;
+
+ addr32[1] = 0xA0A1A2A3;
+ addr32[2] = 0xB0B1B2B3;
+
+ check(!patch_uint(&addr32[1], 0xC0C1C2C3));
+
+ check(addr32[0] == 0);
+ check(addr32[1] == 0xC0C1C2C3);
+ check(addr32[2] == 0xB0B1B2B3);
+ check(addr32[3] == 0);
+
+ /* Unaligned patch_ulong() should fail */
+ if (IS_ENABLED(CONFIG_PPC64))
+ check(patch_ulong(&addr32[1], 0xD0D1D2D3) == -EINVAL);
+
+ check(!patch_ulong(&addr32[2], 0xD0D1D2D3));
+
+ check(addr32[0] == 0);
+ check(addr32[1] == 0xC0C1C2C3);
+ check(*(unsigned long *)(&addr32[2]) == 0xD0D1D2D3);
+
+ if (!IS_ENABLED(CONFIG_PPC64))
+ check(addr32[3] == 0);
+
+ check(addr32[4] == 0);
+
+ vfree(buf);
+}
+
static int __init test_code_patching(void)
{
pr_info("Running code patching self-tests ...\n");
@@ -448,6 +488,7 @@ static int __init test_code_patching(void)
test_translate_branch();
test_prefixed_patching();
test_multi_instruction_patching();
+ test_data_patching();
return 0;
}
--
2.45.0
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