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powerpc: Test prefixed code patching

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Expand the code-patching self-tests to includes tests for patching
prefixed instructions.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Use CONFIG_PPC64 not __powerpc64__]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-25-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-05-06 13:40:44 +10:00 committed by Michael Ellerman
parent 650b55b707
commit f77f8ff7f1
3 changed files with 42 additions and 1 deletions
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2
arch/powerpc/lib/Makefile
View file

@ -16,7 +16,7 @@ CFLAGS_code-patching.o += -DDISABLE_BRANCH_PROFILING
CFLAGS_feature-fixups.o += -DDISABLE_BRANCH_PROFILING
endif
obj-y += alloc.o code-patching.o feature-fixups.o pmem.o inst.o
obj-y += alloc.o code-patching.o feature-fixups.o pmem.o inst.o test_code-patching.o
ifndef CONFIG_KASAN
obj-y += string.o memcmp_$(BITS).o

21
arch/powerpc/lib/code-patching.c
View file

@ -708,6 +708,26 @@ static void __init test_translate_branch(void)
vfree(buf);
}
#ifdef CONFIG_PPC64
static void __init test_prefixed_patching(void)
{
extern unsigned int code_patching_test1[];
extern unsigned int code_patching_test1_expected[];
extern unsigned int end_code_patching_test1[];
__patch_instruction((struct ppc_inst *)code_patching_test1,
ppc_inst_prefix(OP_PREFIX << 26, 0x00000000),
(struct ppc_inst *)code_patching_test1);
check(!memcmp(code_patching_test1,
code_patching_test1_expected,
sizeof(unsigned int) *
(end_code_patching_test1 - code_patching_test1)));
}
#else
static inline void test_prefixed_patching(void) {}
#endif
static int __init test_code_patching(void)
{
printk(KERN_DEBUG "Running code patching self-tests ...\n");
@ -716,6 +736,7 @@ static int __init test_code_patching(void)
test_branch_bform();
test_create_function_call();
test_translate_branch();
test_prefixed_patching();
return 0;
}

20
arch/powerpc/lib/test_code-patching.S Normal file
View file

@ -0,0 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020 IBM Corporation
*/
#include <asm/ppc-opcode.h>
.text
#define globl(x) \
.globl x; \
x:
globl(code_patching_test1)
nop
nop
globl(end_code_patching_test1)
globl(code_patching_test1_expected)
.long OP_PREFIX << 26
.long 0x0000000