Commit b7d47339 authored by Benjamin Gray's avatar Benjamin Gray Committed by Michael Ellerman
Browse files

powerpc/code-patching: Add boot selftest for data patching 



Extend the code patching selftests with some basic coverage of the new
data patching variants too.

Signed-off-by: default avatarBenjamin Gray <bgray@linux.ibm.com>
Reviewed-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240515024445.236364-6-bgray@linux.ibm.com
parent 5799cd76

arch/powerpc/lib/test-code-patching.c

+41 −0
Original line number Diff line number Diff line
@@ -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;

}