From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-x241.google.com (mail-pg0-x241.google.com [IPv6:2607:f8b0:400e:c05::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xG33Y0ZP8zDrCf for ; Mon, 24 Jul 2017 11:01:29 +1000 (AEST) Received: by mail-pg0-x241.google.com with SMTP id g14so5590760pgu.4 for ; Sun, 23 Jul 2017 18:01:28 -0700 (PDT) Received: from matt.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id i5sm22043976pgk.61.2017.07.23.18.01.25 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 23 Jul 2017 18:01:26 -0700 (PDT) From: Matt Brown To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 3/5] powerpc/lib/sstep: Add bpermd instruction emulation Date: Mon, 24 Jul 2017 11:01:07 +1000 Message-Id: <20170724010109.21263-3-matthew.brown.dev@gmail.com> In-Reply-To: <20170724010109.21263-1-matthew.brown.dev@gmail.com> References: <20170724010109.21263-1-matthew.brown.dev@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This adds emulation for the bpermd instruction. Tested for correctness against the bpermd instruction on ppc64le. Signed-off-by: Matt Brown --- v2: - fixed opcode - added ifdef tags to do_bpermd func - fixed bitshifting errors --- arch/powerpc/lib/sstep.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index e6a16a3..a756f44 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -641,6 +641,24 @@ static nokprobe_inline void do_popcnt(struct pt_regs *regs, unsigned long v1, regs->gpr[ra] = (high << 32) | low; } +#ifdef __powerpc64__ +static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1, + unsigned long v2, int ra) +{ + unsigned char perm, idx; + unsigned int i; + + perm = 0; + for (i = 0; i < 8; i++) { + idx = (v1 >> (i * 8)) & 0xff; + if (idx < 64) + if (v2 & PPC_BIT(idx)) + perm |= 1 << i; + } + regs->gpr[ra] = perm; +} +#endif /* __powerpc64__ */ + static nokprobe_inline int trap_compare(long v1, long v2) { int ret = 0; @@ -1230,7 +1248,11 @@ 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; - +#ifdef __powerpc64__ + case 252: /* bpermd */ + do_bpermd(regs, regs->gpr[rd], regs->gpr[rb], ra); + goto logical_done; +#endif case 284: /* xor */ regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]); goto logical_done; -- 2.9.3