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

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

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Reviewed-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240515024445.236364-6-bgray@linux.ibm.com
This commit is contained in:
Benjamin Gray 2024-05-15 12:44:45 +10:00 committed by Michael Ellerman
parent 5799cd765f
commit b7d47339d0
1 changed files with 41 additions and 0 deletions
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41
arch/powerpc/lib/test-code-patching.c
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@ -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;
}