From 32628b5cf3bcdf31d7e00b0e8229051ee2afe96e Mon Sep 17 00:00:00 2001 From: Sandipan Das Date: Fri, 22 Feb 2019 12:23:29 +0530 Subject: [PATCH] powerpc sstep: Add support for cnttzw, cnttzd instructions This adds emulation support for the following integer instructions: * Count Trailing Zeros Word (cnttzw[.]) * Count Trailing Zeros Doubleword (cnttzd[.]) Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman --- arch/powerpc/lib/sstep.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index ab575e02f9b8..94189da4c159 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1819,6 +1819,20 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, case 506: /* popcntd */ do_popcnt(regs, op, regs->gpr[rd], 64); goto logical_done_nocc; +#endif + case 538: /* cnttzw */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return -1; + val = (unsigned int) regs->gpr[rd]; + op->val = (val ? __builtin_ctz(val) : 32); + goto logical_done; +#ifdef __powerpc64__ + case 570: /* cnttzd */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return -1; + val = regs->gpr[rd]; + op->val = (val ? __builtin_ctzl(val) : 64); + goto logical_done; #endif case 922: /* extsh */ op->val = (signed short) regs->gpr[rd];