[PATCH v4 5/5] powerpc/code-patching: Add boot selftest for data patching
Hari Bathini
hbathini at linux.ibm.com
Tue Aug 20 17:00:42 AEST 2024
On 15/05/24 8:14 am, Benjamin Gray wrote:
> 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>
Reviewed-by: Hari Bathini <hbathini 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;
> }
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