From patchwork Mon Mar 22 16:37:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 12155543 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E2A6C433E1 for ; Mon, 22 Mar 2021 16:38:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00C036199E for ; Mon, 22 Mar 2021 16:38:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231390AbhCVQiA (ORCPT ); Mon, 22 Mar 2021 12:38:00 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:54162 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231224AbhCVQht (ORCPT ); Mon, 22 Mar 2021 12:37:49 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4F40Xk3KZLz9txkP; Mon, 22 Mar 2021 17:37:42 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id kXWr-QFZSY8s; Mon, 22 Mar 2021 17:37:42 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4F40Xk2Rr1z9txkL; Mon, 22 Mar 2021 17:37:42 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id EAE848B79C; Mon, 22 Mar 2021 17:37:47 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id mTjpfe10-yXY; Mon, 22 Mar 2021 17:37:47 +0100 (CET) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 9F33C8B7A4; Mon, 22 Mar 2021 17:37:47 +0100 (CET) Received: by po16121vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 83678675FC; Mon, 22 Mar 2021 16:37:47 +0000 (UTC) Message-Id: <0cd2506f598e7095ea43e62dca1f472de5474a0d.1616430991.git.christophe.leroy@csgroup.eu> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v2 2/8] powerpc/bpf: Change register numbering for bpf_set/is_seen_register() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@chromium.org, naveen.n.rao@linux.ibm.com, sandipan@linux.ibm.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, bpf@vger.kernel.org Date: Mon, 22 Mar 2021 16:37:47 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Instead of using BPF register number as input in functions bpf_set_seen_register() and bpf_is_seen_register(), use CPU register number directly. Signed-off-by: Christophe Leroy --- arch/powerpc/net/bpf_jit_comp64.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index aaf1a887f653..51b3f440288c 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -31,12 +31,12 @@ static inline void bpf_flush_icache(void *start, void *end) static inline bool bpf_is_seen_register(struct codegen_context *ctx, int i) { - return (ctx->seen & (1 << (31 - b2p[i]))); + return ctx->seen & (1 << (31 - i)); } static inline void bpf_set_seen_register(struct codegen_context *ctx, int i) { - ctx->seen |= (1 << (31 - b2p[i])); + ctx->seen |= 1 << (31 - i); } static inline bool bpf_has_stack_frame(struct codegen_context *ctx) @@ -47,7 +47,7 @@ static inline bool bpf_has_stack_frame(struct codegen_context *ctx) * - the bpf program uses its stack area * The latter condition is deduced from the usage of BPF_REG_FP */ - return ctx->seen & SEEN_FUNC || bpf_is_seen_register(ctx, BPF_REG_FP); + return ctx->seen & SEEN_FUNC || bpf_is_seen_register(ctx, b2p[BPF_REG_FP]); } /* @@ -124,11 +124,11 @@ static void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx) * in the protected zone below the previous stack frame */ for (i = BPF_REG_6; i <= BPF_REG_10; i++) - if (bpf_is_seen_register(ctx, i)) + if (bpf_is_seen_register(ctx, b2p[i])) PPC_BPF_STL(b2p[i], 1, bpf_jit_stack_offsetof(ctx, b2p[i])); /* Setup frame pointer to point to the bpf stack area */ - if (bpf_is_seen_register(ctx, BPF_REG_FP)) + if (bpf_is_seen_register(ctx, b2p[BPF_REG_FP])) EMIT(PPC_RAW_ADDI(b2p[BPF_REG_FP], 1, STACK_FRAME_MIN_SIZE + ctx->stack_size)); } @@ -139,7 +139,7 @@ static void bpf_jit_emit_common_epilogue(u32 *image, struct codegen_context *ctx /* Restore NVRs */ for (i = BPF_REG_6; i <= BPF_REG_10; i++) - if (bpf_is_seen_register(ctx, i)) + if (bpf_is_seen_register(ctx, b2p[i])) PPC_BPF_LL(b2p[i], 1, bpf_jit_stack_offsetof(ctx, b2p[i])); /* Tear down our stack frame */ @@ -330,9 +330,9 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, * any issues. */ if (dst_reg >= BPF_PPC_NVR_MIN && dst_reg < 32) - bpf_set_seen_register(ctx, insn[i].dst_reg); + bpf_set_seen_register(ctx, dst_reg); if (src_reg >= BPF_PPC_NVR_MIN && src_reg < 32) - bpf_set_seen_register(ctx, insn[i].src_reg); + bpf_set_seen_register(ctx, src_reg); switch (code) { /*