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powerpc/test_emulate_step: Enhancement to test negative scenarios 

add provision to declare test is a negative scenario, verify
whether emulation fails and avoid executing it.

Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200626095158.1031507-2-bala24@linux.ibm.com
This commit is contained in:
Balamuruhan S 2020-06-26 15:21:55 +05:30 committed by Michael Ellerman
parent 8b98afc117
commit 93c3a0ba2a
1 changed files with 21 additions and 9 deletions
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30
arch/powerpc/lib/test_emulate_step.c
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@ -18,6 +18,7 @@
#define IGNORE_GPR(n) (0x1UL << (n))
#define IGNORE_XER (0x1UL << 32)
#define IGNORE_CCR (0x1UL << 33)
#define NEGATIVE_TEST (0x1UL << 63)
#define TEST_PLD(r, base, i, pr) \
ppc_inst_prefix(PPC_PREFIX_8LS | __PPC_PRFX_R(pr) | IMM_H(i), \
@ -1135,8 +1136,10 @@ static struct compute_test compute_tests[] = {
};
static int __init emulate_compute_instr(struct pt_regs *regs,
struct ppc_inst instr)
struct ppc_inst instr,
bool negative)
{
int analysed;
extern s32 patch__exec_instr;
struct instruction_op op;
@ -1145,13 +1148,17 @@ static int __init emulate_compute_instr(struct pt_regs *regs,
regs->nip = patch_site_addr(&patch__exec_instr);
if (analyse_instr(&op, regs, instr) != 1 ||
GETTYPE(op.type) != COMPUTE) {
pr_info("execution failed, instruction = %s\n", ppc_inst_as_str(instr));
analysed = analyse_instr(&op, regs, instr);
if (analysed != 1 || GETTYPE(op.type) != COMPUTE) {
if (negative)
return -EFAULT;
pr_info("emulation failed, instruction = %s\n", ppc_inst_as_str(instr));
return -EFAULT;
}
emulate_update_regs(regs, &op);
if (analysed == 1 && negative)
pr_info("negative test failed, instruction = %s\n", ppc_inst_as_str(instr));
if (!negative)
emulate_update_regs(regs, &op);
return 0;
}
@ -1189,7 +1196,7 @@ static void __init run_tests_compute(void)
struct pt_regs *regs, exp, got;
unsigned int i, j, k;
struct ppc_inst instr;
bool ignore_gpr, ignore_xer, ignore_ccr, passed;
bool ignore_gpr, ignore_xer, ignore_ccr, passed, rc, negative;
for (i = 0; i < ARRAY_SIZE(compute_tests); i++) {
test = &compute_tests[i];
@ -1203,6 +1210,7 @@ static void __init run_tests_compute(void)
instr = test->subtests[j].instr;
flags = test->subtests[j].flags;
regs = &test->subtests[j].regs;
negative = flags & NEGATIVE_TEST;
ignore_xer = flags & IGNORE_XER;
ignore_ccr = flags & IGNORE_CCR;
passed = true;
@ -1217,8 +1225,12 @@ static void __init run_tests_compute(void)
exp.msr = MSR_KERNEL;
got.msr = MSR_KERNEL;
if (emulate_compute_instr(&got, instr) ||
execute_compute_instr(&exp, instr)) {
rc = emulate_compute_instr(&got, instr, negative) != 0;
if (negative) {
/* skip executing instruction */
passed = rc;
goto print;
} else if (rc || execute_compute_instr(&exp, instr)) {
passed = false;
goto print;
}