This add emulation for the prtyw and prtyd instructions. Tested for logical correctness against the prtyw and prtyd instructions on ppc64le.
Signed-off-by: Matt Brown <matthew.brown....@gmail.com> --- v2: - fixed opcodes - fixed bitshifting and typecast errors - merged do_prtyw and do_prtyd into single function --- arch/powerpc/lib/sstep.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index a756f44..1820fd6 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -658,6 +658,29 @@ static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1, regs->gpr[ra] = perm; } #endif /* __powerpc64__ */ +/* + * The size parameter adjusts the equivalent prty instruction. + * prtyw = 32, prtyd = 64 + */ +static nokprobe_inline void do_prty(struct pt_regs *regs, unsigned long v, + int size, int ra) +{ + unsigned long long high, low; + unsigned int i; + + high = 0; + low = 0; + + for (i = 0; i < 8; i++) { + if (v & (1UL << (i * 8))) + (i < 4) ? (low++) : (high++); + } + + if (size == 32) + regs->gpr[ra] = ((high & 1) << 32) | (low & 1); + else + regs->gpr[ra] = (high + low) & 1; +} static nokprobe_inline int trap_compare(long v1, long v2) { @@ -1248,6 +1271,14 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs, case 124: /* nor */ regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]); goto logical_done; + + case 154: /* prtyw */ + do_prty(regs, regs->gpr[rd], 32, ra); + goto logical_done; + + case 186: /* prtyd */ + do_prty(regs, regs->gpr[rd], 64, ra); + goto logical_done; #ifdef __powerpc64__ case 252: /* bpermd */ do_bpermd(regs, regs->gpr[rd], regs->gpr[rb], ra); -- 2.9.3