From nobody Mon Feb 9 20:36:24 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=eik.bme.hu Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1686870371522151.4572879751937; Thu, 15 Jun 2023 16:06:11 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q9w01-0002W6-9J; Thu, 15 Jun 2023 19:03:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q9vzy-0002NO-Sj; Thu, 15 Jun 2023 19:03:26 -0400 Received: from zero.eik.bme.hu ([152.66.115.2]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q9vzx-0007jD-0e; Thu, 15 Jun 2023 19:03:26 -0400 Received: from zero.eik.bme.hu (blah.eik.bme.hu [152.66.115.182]) by localhost (Postfix) with SMTP id 14CC1748A59; Fri, 16 Jun 2023 01:03:18 +0200 (CEST) Received: by zero.eik.bme.hu (Postfix, from userid 432) id E46A0748A56; Fri, 16 Jun 2023 01:03:17 +0200 (CEST) Message-Id: In-Reply-To: References: From: BALATON Zoltan Subject: [PATCH v3 08/14] target/ppc: Fix gen_sc to use correct nip MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: clg@kaod.org, Greg Kurz , Daniel Henrique Barboza , Nicholas Piggin Date: Fri, 16 Jun 2023 01:03:17 +0200 (CEST) X-Spam-Probability: 8% Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=152.66.115.2; envelope-from=balaton@eik.bme.hu; helo=zero.eik.bme.hu X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1686870373484100003 Content-Type: text/plain; charset="utf-8" Most exceptions are raised with nip pointing to the faulting instruction but the sc instruction generating a syscall exception leaves nip pointing to next instruction. Fix gen_sc to not use gen_exception_err() which sets nip back but correctly set nip to pc_next so we don't have to patch this in the exception handlers. This changes the nip logged in dump_syscall and dump_hcall debug functions but now this matches how nip would be on a real CPU. Signed-off-by: BALATON Zoltan Reviewed-by: Nicholas Piggin --- target/ppc/excp_helper.c | 39 --------------------------------------- target/ppc/translate.c | 8 +++++--- 2 files changed, 5 insertions(+), 42 deletions(-) diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index f19a0f2d1d..903216c2a6 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -495,12 +495,6 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp) break; case POWERPC_EXCP_SYSCALL: /* System call exception = */ dump_syscall(env); - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; break; case POWERPC_EXCP_FIT: /* Fixed-interval timer interrupt = */ trace_ppc_excp_print("FIT"); @@ -611,12 +605,6 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp) break; case POWERPC_EXCP_SYSCALL: /* System call exception = */ dump_syscall(env); - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; break; case POWERPC_EXCP_FPU: /* Floating-point unavailable exception = */ case POWERPC_EXCP_DECR: /* Decrementer exception = */ @@ -759,13 +747,6 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp) } else { dump_syscall(env); } - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; - /* * The Virtual Open Firmware (VOF) relies on the 'sc 1' * instruction to communicate with QEMU. The pegasos2 machine @@ -910,13 +891,6 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int exc= p) } else { dump_syscall(env); } - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; - /* * The Virtual Open Firmware (VOF) relies on the 'sc 1' * instruction to communicate with QEMU. The pegasos2 machine @@ -1075,12 +1049,6 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int = excp) break; case POWERPC_EXCP_SYSCALL: /* System call exception = */ dump_syscall(env); - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; break; case POWERPC_EXCP_FPU: /* Floating-point unavailable exception = */ case POWERPC_EXCP_APU: /* Auxiliary processor unavailable = */ @@ -1322,13 +1290,6 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int = excp) } else { dump_syscall(env); } - - /* - * We need to correct the NIP which in this case is supposed - * to point to the next instruction - */ - env->nip +=3D 4; - /* "PAPR mode" built-in hypercall emulation */ if (lev =3D=3D 1 && books_vhyp_handles_hcall(cpu)) { PPCVirtualHypervisorClass *vhc =3D diff --git a/target/ppc/translate.c b/target/ppc/translate.c index a32a9b8a5f..4260d3d66f 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -4419,10 +4419,12 @@ static void gen_hrfid(DisasContext *ctx) #endif static void gen_sc(DisasContext *ctx) { - uint32_t lev; + uint32_t lev =3D (ctx->opcode >> 5) & 0x7F; =20 - lev =3D (ctx->opcode >> 5) & 0x7F; - gen_exception_err(ctx, POWERPC_SYSCALL, lev); + gen_update_nip(ctx, ctx->base.pc_next); + gen_helper_raise_exception_err(cpu_env, tcg_constant_i32(POWERPC_SYSCA= LL), + tcg_constant_i32(lev)); + ctx->base.is_jmp =3D DISAS_NORETURN; } =20 #if defined(TARGET_PPC64) --=20 2.30.9