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ARM: kprobes: Fix unreliable MRS instruction tests 

For the instruction 'mrs Rn, cpsr' the resulting value of Rn can vary due to
external factors we can't control. So get the test code to mask out these
indeterminate bits.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Jon Medhurst (Tixy) 2015-01-05 19:29:40 +08:00 committed by Jon Medhurst
parent 0dc016dbd8
commit 4cd872d973
4 changed files with 43 additions and 19 deletions
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6
arch/arm/probes/kprobes/test-arm.c
View File

@ -204,9 +204,9 @@ void kprobe_arm_test_cases(void)
#endif
TEST_GROUP("Miscellaneous instructions")
TEST("mrs r0, cpsr")
TEST("mrspl r7, cpsr")
TEST("mrs r14, cpsr")
TEST_RMASKED("mrs r",0,~PSR_IGNORE_BITS,", cpsr")
TEST_RMASKED("mrspl r",7,~PSR_IGNORE_BITS,", cpsr")
TEST_RMASKED("mrs r",14,~PSR_IGNORE_BITS,", cpsr")
TEST_UNSUPPORTED(__inst_arm(0xe10ff000) " @ mrs r15, cpsr")
TEST_UNSUPPORTED("mrs r0, spsr")
TEST_UNSUPPORTED("mrs lr, spsr")

19
arch/arm/probes/kprobes/test-core.c
View File

@ -1056,15 +1056,6 @@ static int test_case_run_count;
static bool test_case_is_thumb;
static int test_instance;
/*
* We ignore the state of the imprecise abort disable flag (CPSR.A) because this
* can change randomly as the kernel doesn't take care to preserve or initialise
* this across context switches. Also, with Security Extentions, the flag may
* not be under control of the kernel; for this reason we ignore the state of
* the FIQ disable flag CPSR.F as well.
*/
#define PSR_IGNORE_BITS (PSR_A_BIT | PSR_F_BIT)
static unsigned long test_check_cc(int cc, unsigned long cpsr)
{
int ret = arm_check_condition(cc << 28, cpsr);
@ -1271,11 +1262,21 @@ test_case_pre_handler(struct kprobe *p, struct pt_regs *regs)
static int __kprobes
test_after_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct test_arg *args;
if (container_of(p, struct test_probe, kprobe)->hit == test_instance)
return 0; /* Already run for this test instance */
result_regs = *regs;
/* Mask out results which are indeterminate */
result_regs.ARM_cpsr &= ~PSR_IGNORE_BITS;
for (args = current_args; args[0].type != ARG_TYPE_END; ++args)
if (args[0].type == ARG_TYPE_REG_MASKED) {
struct test_arg_regptr *arg =
(struct test_arg_regptr *)args;
result_regs.uregs[arg->reg] &= arg->val;
}
/* Undo any changes done to SP by the test case */
regs->ARM_sp = (unsigned long)current_stack;

33
arch/arm/probes/kprobes/test-core.h
View File

@ -45,10 +45,11 @@ extern int kprobe_test_cc_position;
*
*/
#define ARG_TYPE_END 0
#define ARG_TYPE_REG 1
#define ARG_TYPE_PTR 2
#define ARG_TYPE_MEM 3
#define ARG_TYPE_END 0
#define ARG_TYPE_REG 1
#define ARG_TYPE_PTR 2
#define ARG_TYPE_MEM 3
#define ARG_TYPE_REG_MASKED 4
#define ARG_FLAG_UNSUPPORTED 0x01
#define ARG_FLAG_SUPPORTED 0x02
@ -61,7 +62,7 @@ struct test_arg {
};
struct test_arg_regptr {
u8 type; /* ARG_TYPE_REG or ARG_TYPE_PTR */
u8 type; /* ARG_TYPE_REG or ARG_TYPE_PTR or ARG_TYPE_REG_MASKED */
u8 reg;
u8 _padding[2];
u32 val;
@ -138,6 +139,12 @@ struct test_arg_end {
".short 0 \n\t" \
".word "#val" \n\t"
#define TEST_ARG_REG_MASKED(reg, val) \
".byte "__stringify(ARG_TYPE_REG_MASKED)" \n\t" \
".byte "#reg" \n\t" \
".short 0 \n\t" \
".word "#val" \n\t"
#define TEST_ARG_END(flags) \
".byte "__stringify(ARG_TYPE_END)" \n\t" \
".byte "TEST_ISA flags" \n\t" \
@ -395,6 +402,22 @@ struct test_arg_end {
" "codex" \n\t" \
TESTCASE_END
#define TEST_RMASKED(code1, reg, mask, code2) \
TESTCASE_START(code1 #reg code2) \
TEST_ARG_REG_MASKED(reg, mask) \
TEST_ARG_END("") \
TEST_INSTRUCTION(code1 #reg code2) \
TESTCASE_END
/*
* We ignore the state of the imprecise abort disable flag (CPSR.A) because this
* can change randomly as the kernel doesn't take care to preserve or initialise
* this across context switches. Also, with Security Extensions, the flag may
* not be under control of the kernel; for this reason we ignore the state of
* the FIQ disable flag CPSR.F as well.
*/
#define PSR_IGNORE_BITS (PSR_A_BIT | PSR_F_BIT)
/*
* Macros for defining space directives spread over multiple lines.

4
arch/arm/probes/kprobes/test-thumb.c
View File

@ -778,8 +778,8 @@ CONDITION_INSTRUCTIONS(22,
TEST_UNSUPPORTED("subs pc, lr, #4")
TEST("mrs r0, cpsr")
TEST("mrs r14, cpsr")
TEST_RMASKED("mrs r",0,~PSR_IGNORE_BITS,", cpsr")
TEST_RMASKED("mrs r",14,~PSR_IGNORE_BITS,", cpsr")
TEST_UNSUPPORTED(__inst_thumb32(0xf3ef8d00) " @ mrs sp, spsr")
TEST_UNSUPPORTED(__inst_thumb32(0xf3ef8f00) " @ mrs pc, spsr")
TEST_UNSUPPORTED("mrs r0, spsr")