From patchwork Wed May 12 18:54:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matheus K. Ferst" X-Patchwork-Id: 12254525 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 DBEA5C433B4 for ; Wed, 12 May 2021 19:13:09 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6932B613C0 for ; Wed, 12 May 2021 19:13:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6932B613C0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=eldorado.org.br Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59880 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lguI6-0006v8-C0 for qemu-devel@archiver.kernel.org; Wed, 12 May 2021 15:13:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53516) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lgu2Y-0006TA-0E; Wed, 12 May 2021 14:57:02 -0400 Received: from [201.28.113.2] (port=20812 helo=outlook.eldorado.org.br) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lgu2W-0007uU-3q; Wed, 12 May 2021 14:57:01 -0400 Received: from power9a ([10.10.71.235]) by outlook.eldorado.org.br with Microsoft SMTPSVC(8.5.9600.16384); Wed, 12 May 2021 15:56:03 -0300 Received: from eldorado.org.br (unknown [10.10.70.45]) by power9a (Postfix) with ESMTP id D4F968000C2; Wed, 12 May 2021 15:56:02 -0300 (-03) From: matheus.ferst@eldorado.org.br To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Subject: [PATCH v4 12/31] target/ppc: Replace POWERPC_EXCP_BRANCH with DISAS_NORETURN Date: Wed, 12 May 2021 15:54:22 -0300 Message-Id: <20210512185441.3619828-13-matheus.ferst@eldorado.org.br> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210512185441.3619828-1-matheus.ferst@eldorado.org.br> References: <20210512185441.3619828-1-matheus.ferst@eldorado.org.br> MIME-Version: 1.0 X-OriginalArrivalTime: 12 May 2021 18:56:03.0234 (UTC) FILETIME=[74C6D820:01D74760] X-Host-Lookup-Failed: Reverse DNS lookup failed for 201.28.113.2 (failed) Received-SPF: pass client-ip=201.28.113.2; envelope-from=matheus.ferst@eldorado.org.br; helo=outlook.eldorado.org.br X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: richard.henderson@linaro.org, f4bug@amsat.org, luis.pires@eldorado.org.br, lagarcia@br.ibm.com, bruno.larsen@eldorado.org.br, matheus.ferst@eldorado.org.br, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson The translation of branch instructions always results in exit from the TB. Remove the synthetic "exception" after no more uses. Signed-off-by: Richard Henderson Signed-off-by: Matheus Ferst --- linux-user/ppc/cpu_loop.c | 3 --- target/ppc/cpu.h | 2 -- target/ppc/translate.c | 8 ++------ 3 files changed, 2 insertions(+), 11 deletions(-) diff --git a/linux-user/ppc/cpu_loop.c b/linux-user/ppc/cpu_loop.c index fe526693d2..fa91ea0eed 100644 --- a/linux-user/ppc/cpu_loop.c +++ b/linux-user/ppc/cpu_loop.c @@ -423,9 +423,6 @@ void cpu_loop(CPUPPCState *env) cpu_abort(cs, "Maintenance exception while in user mode. " "Aborting\n"); break; - case POWERPC_EXCP_BRANCH: /* branch instruction: */ - /* We just stopped because of a branch. Go on */ - break; case POWERPC_EXCP_SYSCALL_USER: /* system call in user-mode emulation */ /* WARNING: diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 22456f9a72..1c3486e9d0 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -131,8 +131,6 @@ enum { POWERPC_EXCP_SYSCALL_VECTORED = 102, /* scv exception */ /* EOL */ POWERPC_EXCP_NB = 103, - /* QEMU exceptions: used internally during code translation */ - POWERPC_EXCP_BRANCH = 0x201, /* branch instruction */ /* QEMU exceptions: special cases we want to stop translation */ POWERPC_EXCP_SYSCALL_USER = 0x203, /* System call in user mode only */ }; diff --git a/target/ppc/translate.c b/target/ppc/translate.c index db6f11d632..43320d2b8b 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -4695,7 +4695,6 @@ static void gen_b(DisasContext *ctx) { target_ulong li, target; - ctx->exception = POWERPC_EXCP_BRANCH; /* sign extend LI */ li = LI(ctx->opcode); li = (li ^ 0x02000000) - 0x02000000; @@ -4709,6 +4708,7 @@ static void gen_b(DisasContext *ctx) } gen_update_cfar(ctx, ctx->cia); gen_goto_tb(ctx, 0, target); + ctx->base.is_jmp = DISAS_NORETURN; } #define BCOND_IM 0 @@ -4721,7 +4721,6 @@ static void gen_bcond(DisasContext *ctx, int type) uint32_t bo = BO(ctx->opcode); TCGLabel *l1; TCGv target; - ctx->exception = POWERPC_EXCP_BRANCH; if (type == BCOND_LR || type == BCOND_CTR || type == BCOND_TAR) { target = tcg_temp_local_new(); @@ -4828,6 +4827,7 @@ static void gen_bcond(DisasContext *ctx, int type) gen_set_label(l1); gen_goto_tb(ctx, 1, ctx->base.pc_next); } + ctx->base.is_jmp = DISAS_NORETURN; } static void gen_bc(DisasContext *ctx) @@ -9293,7 +9293,6 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs) /* Check trace mode exceptions */ if (unlikely(ctx->singlestep_enabled & CPU_SINGLE_STEP && (ctx->base.pc_next <= 0x100 || ctx->base.pc_next > 0xF00) && - ctx->exception != POWERPC_EXCP_BRANCH && ctx->base.is_jmp != DISAS_NORETURN)) { uint32_t excp = gen_prep_dbgex(ctx); gen_exception_nip(ctx, excp, ctx->base.pc_next); @@ -9309,9 +9308,6 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs) switch (ctx->exception) { case POWERPC_EXCP_NONE: break; - case POWERPC_EXCP_BRANCH: - ctx->base.is_jmp = DISAS_NORETURN; - break; default: /* Every other ctx->exception should have set NORETURN. */ g_assert_not_reached();