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powerpc/sstep: Set NIP in instruction emulation tests

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The tests for emulation of compute instructions execute and
emulate an instruction and then compare the results to verify the
emulation. In ISA v3.1 there are instructions that operate relative to
the NIP. Therefore set the NIP in the regs used for the emulated
instruction to the location of the executed instruction so they will
give the same result.

This is a rework of a patch by Balamuruhan S.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200525025923.19843-3-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-05-25 12:59:21 +10:00 committed by Michael Ellerman
parent 0396de6d85
commit 1c89cf7fbe
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/lib/test_emulate_step.c
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@ -1011,11 +1011,14 @@ static struct compute_test compute_tests[] = {
static int __init emulate_compute_instr(struct pt_regs *regs,
struct ppc_inst instr)
{
extern s32 patch__exec_instr;
struct instruction_op op;
if (!regs || !ppc_inst_val(instr))
return -EINVAL;
regs->nip = patch_site_addr(&patch__exec_instr);
if (analyse_instr(&op, regs, instr) != 1 ||
GETTYPE(op.type) != COMPUTE) {
pr_info("emulation failed, instruction = 0x%08x\n", ppc_inst_val(instr));