On Fri, 2020-03-20 at 16:18 +1100, Jordan Niethe wrote:
> This adds emulation support for the following prefixed Fixed-Point
> Arithmetic instructions:
> * Prefixed Add Immediate (paddi)
>
> Signed-off-by: Jordan Niethe <jniet...@gmail.com>
Reviewed-by: Balamuruhan S <bal...@linux.ibm.com>
> ---
> v3: Since we moved the prefixed loads/stores into the load/store switch
> statement it no longer makes sense to have paddi in there, so move it
> out.
> ---
> arch/powerpc/lib/sstep.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
> index daef70eb8e22..6862fc019258 100644
> --- a/arch/powerpc/lib/sstep.c
> +++ b/arch/powerpc/lib/sstep.c
> @@ -1335,6 +1335,26 @@ int analyse_instr(struct instruction_op *op, const
> struct pt_regs *regs,
>
> switch (opcode) {
> #ifdef __powerpc64__
> + case 1:
> + prefix_r = word & (1ul << 20);
> + ra = (suffix >> 16) & 0x1f;
> + rd = (suffix >> 21) & 0x1f;
> + op->reg = rd;
> + op->val = regs->gpr[rd];
> + suffixopcode = suffix >> 26;
> + prefixtype = (word >> 24) & 0x3;
> + switch (prefixtype) {
> + case 2:
> + if (prefix_r && ra)
> + return 0;
> + switch (suffixopcode) {
> + case 14: /* paddi */
> + op->type = COMPUTE | PREFIXED;
> + op->val = mlsd_8lsd_ea(word, suffix, regs);
> + goto compute_done;
> + }
> + }
> + break;
> case 2: /* tdi */
> if (rd & trap_compare(regs->gpr[ra], (short) word))
> goto trap;
