From patchwork Thu Jan 16 16:54:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 1224335 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=vivier.eu 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 ozlabs.org (Postfix) with ESMTPS id 47z9KK3CDqz9sSy for ; Fri, 17 Jan 2020 03:54:45 +1100 (AEDT) Received: from localhost ([::1]:45082 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1is8Pr-0002pZ-BT for incoming@patchwork.ozlabs.org; Thu, 16 Jan 2020 11:54:43 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51980) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1is8PV-0002ox-Qn for qemu-devel@nongnu.org; Thu, 16 Jan 2020 11:54:25 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1is8PR-0000ci-T5 for qemu-devel@nongnu.org; Thu, 16 Jan 2020 11:54:21 -0500 Received: from mout.kundenserver.de ([212.227.126.130]:58801) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1is8PR-0000bk-JO for qemu-devel@nongnu.org; Thu, 16 Jan 2020 11:54:17 -0500 Received: from localhost.localdomain ([78.238.229.36]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MqK6l-1jNdey2JMZ-00nQdW; Thu, 16 Jan 2020 17:54:11 +0100 From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PATCH v2] m68k: Fix regression causing Single-Step via GDB/RSP to not single step Date: Thu, 16 Jan 2020 17:54:10 +0100 Message-Id: <20200116165410.2076012-1-laurent@vivier.eu> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 X-Provags-ID: V03:K1:Wni8AbMesIINrO+TEM6raf3K+aRP38wOKuwnqyEMaxQtbGh8Mm5 309PsLNqKmjkuY9/tdjOrSrtphdOKSteXfT1tgYmasprtSHCHRQJOuRYG5CVQyy4mjsZd/j 7M10MlFg+YSmax3aBfULjp659V1JUF5o11Il/X3KjJ8cJZkYmYqQsdam9VNowm5qzeoZ8vM WEXz7uGwxaf4cdO4r7n9A== X-UI-Out-Filterresults: notjunk:1; V03:K0:GGVtj4xCsGs=:7gbu4KYtD2o+RWWoOrAj+M 9cY0+eiIJBnxfaMX8jEj1O3UmnYxeyX0VqIhLzMC9ayN0+OpzAg2e78+cb6ukz+voyt6keKBg F5s33DizPW3ZQv1u4FITbuMLe6v46Trleu7Fp+MpSkZ+v6umCMW5ZV9Lbh/zo17MHr/A4SMfC u0hg3gudD3uyW0XeU7G0axQhBECDw2oMf6eoPKhHcJEx1sx2mICsr7URfvV7y8exhREwYieAc GJC0h9dd9BD9QGzze+LE/lBhgBr1J7pbYKZPlbNXL2qma38SHE6nTrhE+Dc30M5dpaufWtC4Z abYm8YQJwwPzXJmMec56wPMGqn1E3Z54P7Blrh0r9/QnUJ52AxHrdzLNi0MIiiEEuvfIZnAHs bOkeMKq/LwAyAAC+/Cyj/pS64FZ7F0GkCT+ywKBoIAEAzGBtoqMMREF74LnO3vX9XRuMCKypW 0YAIDt+aEP5W+izpONsndKAhKtgf6Gja7cfSavotRWRMkFJGWl6BFkRxJSHm1NmfiyVRFbcX3 BkhgKC+qw6dqCGSKogJlQkNHwd06rgBfABL0MUA2VwbnquqR7HdCrwgZT1MVfN8NgRKumKges Aejhwer+GhDxKbwjoysTb3SaBaUe5cwdj6sjWJNa/T2n3jneb4eRDwDb94Df6UprjcZ1rfBHM WVsKSCcuYgorTkkHh5NkpGDbU/iHeMq+NGzpSp/MZIXCag+6qk+qZ6KpIT/kYybZPMdvBY9Z0 enlMy2Pt+T4rvAZax/3F6EstwVSMoMgtWT6Hud8GTOVxY8AVkukK36l+OghHdl2lwIHtFTXkm Iu+kpSNlEstUM/3XxyPo+GZWe+s0hhJfQPf24+DUYryfX3rCnXY2iO2lR5yiJVOlvbfQ6gbkJ jPBfjVMBjL5FVaYMJ5bA== X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 212.227.126.130 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: Lucien Murray-Pitts , Richard Henderson , Laurent Vivier Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" A regression that was introduced, with the refactor to TranslatorOps, drops two lines that update the PC when single-stepping is being performed. Fixes: 11ab74b01e0a ("target/m68k: Convert to TranslatorOps") Reported-by: Lucien Murray-Pitts Suggested-by: Lucien Murray-Pitts Suggested-by: Richard Henderson Reviewed-by: Richard Henderson Signed-off-by: Laurent Vivier --- Notes: v3: introduce gen_raise_exception() (Richard) v2: update patch from Lucien with changes from Richard update subject to prefix it with "m68k:" rebase target/m68k/translate.c | 42 ++++++++++++++++++++++++++--------------- 1 file changed, 27 insertions(+), 15 deletions(-) diff --git a/target/m68k/translate.c b/target/m68k/translate.c index fcdb7bc8e4..16fae5ac9e 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -289,16 +289,21 @@ static void gen_jmp(DisasContext *s, TCGv dest) s->base.is_jmp = DISAS_JUMP; } -static void gen_exception(DisasContext *s, uint32_t dest, int nr) +static void gen_raise_exception(int nr) { TCGv_i32 tmp; - update_cc_op(s); - tcg_gen_movi_i32(QREG_PC, dest); - tmp = tcg_const_i32(nr); gen_helper_raise_exception(cpu_env, tmp); tcg_temp_free_i32(tmp); +} + +static void gen_exception(DisasContext *s, uint32_t dest, int nr) +{ + update_cc_op(s); + tcg_gen_movi_i32(QREG_PC, dest); + + gen_raise_exception(nr); s->base.is_jmp = DISAS_NORETURN; } @@ -6198,29 +6203,36 @@ static void m68k_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu) { DisasContext *dc = container_of(dcbase, DisasContext, base); - if (dc->base.is_jmp == DISAS_NORETURN) { - return; - } - if (dc->base.singlestep_enabled) { - gen_helper_raise_exception(cpu_env, tcg_const_i32(EXCP_DEBUG)); - return; - } - switch (dc->base.is_jmp) { + case DISAS_NORETURN: + break; case DISAS_TOO_MANY: update_cc_op(dc); - gen_jmp_tb(dc, 0, dc->pc); + if (dc->base.singlestep_enabled) { + tcg_gen_movi_i32(QREG_PC, dc->pc); + gen_raise_exception(EXCP_DEBUG); + } else { + gen_jmp_tb(dc, 0, dc->pc); + } break; case DISAS_JUMP: /* We updated CC_OP and PC in gen_jmp/gen_jmp_im. */ - tcg_gen_lookup_and_goto_ptr(); + if (dc->base.singlestep_enabled) { + gen_raise_exception(EXCP_DEBUG); + } else { + tcg_gen_lookup_and_goto_ptr(); + } break; case DISAS_EXIT: /* * We updated CC_OP and PC in gen_exit_tb, but also modified * other state that may require returning to the main loop. */ - tcg_gen_exit_tb(NULL, 0); + if (dc->base.singlestep_enabled) { + gen_raise_exception(EXCP_DEBUG); + } else { + tcg_gen_exit_tb(NULL, 0); + } break; default: g_assert_not_reached();