From nobody Tue Nov 26 11:44:47 2024 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 1708601774464175.0526146394683; Thu, 22 Feb 2024 03:36:14 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rd7L7-00052F-9O; Thu, 22 Feb 2024 06:34:09 -0500 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 1rd7L1-0004o8-6N; Thu, 22 Feb 2024 06:34:03 -0500 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 1rd7Ky-0006Lk-LB; Thu, 22 Feb 2024 06:34:02 -0500 Received: from zero.eik.bme.hu (localhost [127.0.0.1]) by zero.eik.bme.hu (Postfix) with ESMTP id E3B064E6006; Thu, 22 Feb 2024 12:33:58 +0100 (CET) Received: from zero.eik.bme.hu ([127.0.0.1]) by zero.eik.bme.hu (zero.eik.bme.hu [127.0.0.1]) (amavisd-new, port 10028) with ESMTP id FkY0OTJ2KUtJ; Thu, 22 Feb 2024 12:33:57 +0100 (CET) Received: by zero.eik.bme.hu (Postfix, from userid 432) id 022844E6027; Thu, 22 Feb 2024 12:33:57 +0100 (CET) X-Virus-Scanned: amavisd-new at eik.bme.hu Message-Id: <9bb0926a0e9f3b5c703fe0b4b6d21edd8eb79bdd.1708601065.git.balaton@eik.bme.hu> In-Reply-To: References: From: BALATON Zoltan Subject: [PATCH v6 3/9] 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: Nicholas Piggin , Daniel Henrique Barboza , clg@kaod.org Date: Thu, 22 Feb 2024 12:33:57 +0100 (CET) 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: 1708601776225100001 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. Signed-off-by: BALATON Zoltan Reviewed-by: Nicholas Piggin --- target/ppc/excp_helper.c | 43 ++-------------------------------------- target/ppc/translate.c | 10 ++++++---- 2 files changed, 8 insertions(+), 45 deletions(-) diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 39eefc168a..1c07a11405 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -116,7 +116,7 @@ static void dump_syscall(CPUPPCState *env) ppc_dump_gpr(env, 0), ppc_dump_gpr(env, 3), ppc_dump_gpr(env, 4), ppc_dump_gpr(env, 5), ppc_dump_gpr(env, 6), ppc_dump_gpr(env, 7), - ppc_dump_gpr(env, 8), env->nip); + ppc_dump_gpr(env, 8), env->nip - 4); } =20 static void dump_hcall(CPUPPCState *env) @@ -131,7 +131,7 @@ static void dump_hcall(CPUPPCState *env) ppc_dump_gpr(env, 7), ppc_dump_gpr(env, 8), ppc_dump_gpr(env, 9), ppc_dump_gpr(env, 10), ppc_dump_gpr(env, 11), ppc_dump_gpr(env, 12), - env->nip); + env->nip - 4); } =20 #ifdef CONFIG_TCG @@ -516,12 +516,6 @@ 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"); @@ -632,12 +626,6 @@ 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 = */ @@ -780,13 +768,6 @@ 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 @@ -932,13 +913,6 @@ 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 @@ -1098,12 +1072,6 @@ 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 = */ @@ -1418,13 +1386,6 @@ 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 049f636927..6a43eda3b9 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -4535,15 +4535,17 @@ static void gen_hrfid(DisasContext *ctx) #endif static void gen_sc(DisasContext *ctx) { - uint32_t lev; - /* * LEV is a 7-bit field, but the top 6 bits are treated as a reserved * field (i.e., ignored). ISA v3.1 changes that to 5 bits, but that is * for Ultravisor which TCG does not support, so just ignore the top 6. */ - lev =3D (ctx->opcode >> 5) & 0x1; - gen_exception_err(ctx, POWERPC_SYSCALL, lev); + uint32_t lev =3D (ctx->opcode >> 5) & 0x1; + + gen_update_nip(ctx, ctx->base.pc_next); + gen_helper_raise_exception_err(tcg_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