From nobody Mon Nov 25 14:32:23 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 1715127687180884.3130966599985; Tue, 7 May 2024 17:21:27 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1s4V0f-0005pq-6M; Tue, 07 May 2024 20:18:13 -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 1s4UyP-0007nL-01; Tue, 07 May 2024 20:15:53 -0400 Received: from zero.eik.bme.hu ([2001:738:2001:2001::2001]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s4UyM-0003o9-JB; Tue, 07 May 2024 20:15:52 -0400 Received: from zero.eik.bme.hu (localhost [127.0.0.1]) by zero.eik.bme.hu (Postfix) with ESMTP id 1845B4E65BB; Wed, 08 May 2024 02:15:29 +0200 (CEST) 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 EyxdzFCqp8IT; Wed, 8 May 2024 02:15:27 +0200 (CEST) Received: by zero.eik.bme.hu (Postfix, from userid 432) id 258654E65D5; Wed, 08 May 2024 02:15:27 +0200 (CEST) X-Virus-Scanned: amavisd-new at eik.bme.hu Message-Id: In-Reply-To: References: From: BALATON Zoltan Subject: [PATCH v3 33/33] target/ppc: Add a macro to check for page protection bit MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: Nicholas Piggin , Daniel Henrique Barboza Date: Wed, 08 May 2024 02:15:27 +0200 (CEST) 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=2001:738:2001:2001::2001; 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 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: 1715127687594100001 Content-Type: text/plain; charset="utf-8" Checking if a page protection bit is set for a given access type is a common operation. Add a macro to avoid repeating the same check at multiple places and also avoid a function call. As this relies on access type and page protection bit values having certain relation also add an assert to ensure that this assumption holds. Signed-off-by: BALATON Zoltan --- target/ppc/cpu_init.c | 4 ++++ target/ppc/internal.h | 20 ++------------------ target/ppc/mmu-hash32.c | 6 +++--- target/ppc/mmu-hash64.c | 2 +- target/ppc/mmu-radix64.c | 2 +- target/ppc/mmu_common.c | 26 +++++++++++++------------- 6 files changed, 24 insertions(+), 36 deletions(-) diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c index 92c71b2a09..6639235544 100644 --- a/target/ppc/cpu_init.c +++ b/target/ppc/cpu_init.c @@ -7377,6 +7377,10 @@ static void ppc_cpu_class_init(ObjectClass *oc, void= *data) resettable_class_set_parent_phases(rc, NULL, ppc_cpu_reset_hold, NULL, &pcc->parent_phases); =20 + /* CHECK_PROT_ACCESS relies on this MMU access and PAGE bits relation = */ + assert(MMU_DATA_LOAD =3D=3D 0 && MMU_DATA_STORE =3D=3D 1 && MMU_INST_F= ETCH =3D=3D 2 && + PAGE_READ =3D=3D 1 && PAGE_WRITE =3D=3D 2 && PAGE_EXEC =3D=3D 4= ); + cc->class_by_name =3D ppc_cpu_class_by_name; cc->has_work =3D ppc_cpu_has_work; cc->mmu_index =3D ppc_cpu_mmu_index; diff --git a/target/ppc/internal.h b/target/ppc/internal.h index 46176c4711..9880422ce3 100644 --- a/target/ppc/internal.h +++ b/target/ppc/internal.h @@ -234,24 +234,8 @@ void destroy_ppc_opcodes(PowerPCCPU *cpu); void ppc_gdb_init(CPUState *cs, PowerPCCPUClass *ppc); const gchar *ppc_gdb_arch_name(CPUState *cs); =20 -/** - * prot_for_access_type: - * @access_type: Access type - * - * Return the protection bit required for the given access type. - */ -static inline int prot_for_access_type(MMUAccessType access_type) -{ - switch (access_type) { - case MMU_INST_FETCH: - return PAGE_EXEC; - case MMU_DATA_LOAD: - return PAGE_READ; - case MMU_DATA_STORE: - return PAGE_WRITE; - } - g_assert_not_reached(); -} +/* Check if permission bit required for the access_type is set in prot */ +#define CHECK_PROT_ACCESS(prot, access_type) ((prot) & (1 << (access_type)= )) =20 #ifndef CONFIG_USER_ONLY =20 diff --git a/target/ppc/mmu-hash32.c b/target/ppc/mmu-hash32.c index b5d7aeed4e..fa4a4ced6d 100644 --- a/target/ppc/mmu-hash32.c +++ b/target/ppc/mmu-hash32.c @@ -213,7 +213,7 @@ static bool ppc_hash32_direct_store(PowerPCCPU *cpu, ta= rget_ulong sr, } =20 *prot =3D key ? PAGE_READ | PAGE_WRITE : PAGE_READ; - if (*prot & prot_for_access_type(access_type)) { + if (CHECK_PROT_ACCESS(*prot, access_type)) { *raddr =3D eaddr; return true; } @@ -364,7 +364,7 @@ bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMU= AccessType access_type, if (env->nb_BATs !=3D 0) { raddr =3D ppc_hash32_bat_lookup(cpu, eaddr, access_type, protp, mm= u_idx); if (raddr !=3D -1) { - if (prot_for_access_type(access_type) & ~*protp) { + if (!CHECK_PROT_ACCESS(*protp, access_type)) { if (guest_visible) { if (access_type =3D=3D MMU_INST_FETCH) { cs->exception_index =3D POWERPC_EXCP_ISI; @@ -432,7 +432,7 @@ bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMU= AccessType access_type, =20 prot =3D ppc_hash32_pte_prot(mmu_idx, sr, pte); =20 - if (prot_for_access_type(access_type) & ~prot) { + if (!CHECK_PROT_ACCESS(prot, access_type)) { /* Access right violation */ qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); if (guest_visible) { diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c index 5a0d80feda..14c2116ae7 100644 --- a/target/ppc/mmu-hash64.c +++ b/target/ppc/mmu-hash64.c @@ -1097,7 +1097,7 @@ bool ppc_hash64_xlate(PowerPCCPU *cpu, vaddr eaddr, M= MUAccessType access_type, amr_prot =3D ppc_hash64_amr_prot(cpu, pte); prot =3D exec_prot & pp_prot & amr_prot; =20 - need_prot =3D prot_for_access_type(access_type); + need_prot =3D CHECK_PROT_ACCESS(PAGE_RWX, access_type); if (need_prot & ~prot) { /* Access right violation */ qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); diff --git a/target/ppc/mmu-radix64.c b/target/ppc/mmu-radix64.c index 395ce3b782..a72cd927c4 100644 --- a/target/ppc/mmu-radix64.c +++ b/target/ppc/mmu-radix64.c @@ -209,7 +209,7 @@ static bool ppc_radix64_check_prot(PowerPCCPU *cpu, MMU= AccessType access_type, } =20 /* Check if requested access type is allowed */ - if (prot_for_access_type(access_type) & ~*prot) { + if (!CHECK_PROT_ACCESS(*prot, access_type)) { /* Page Protected for that Access */ *fault_cause |=3D access_type =3D=3D MMU_INST_FETCH ? SRR1_NOEXEC_= GUARD : DSISR_PROTFAULT; diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c index eff015066d..24d68926b4 100644 --- a/target/ppc/mmu_common.c +++ b/target/ppc/mmu_common.c @@ -76,11 +76,6 @@ void ppc_store_sdr1(CPUPPCState *env, target_ulong value) /*************************************************************************= ****/ /* PowerPC MMU emulation */ =20 -static int check_prot(int prot, MMUAccessType access_type) -{ - return prot & prot_for_access_type(access_type) ? 0 : -2; -} - int ppc6xx_tlb_getnum(CPUPPCState *env, target_ulong eaddr, int way, int is_code) { @@ -125,13 +120,14 @@ static int ppc6xx_tlb_pte_check(mmu_ctx_t *ctx, targe= t_ulong pte0, /* Keep the matching PTE information */ ctx->raddr =3D pte1; ctx->prot =3D ppc_hash32_pp_prot(ctx->key, pp, ctx->nx); - ret =3D check_prot(ctx->prot, access_type); - if (ret =3D=3D 0) { + if (CHECK_PROT_ACCESS(ctx->prot, access_type)) { /* Access granted */ qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n"); + ret =3D 0; } else { /* Access right violation */ qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); + ret =3D -2; } } } @@ -317,12 +313,14 @@ static int get_bat_6xx_tlb(CPUPPCState *env, mmu_ctx_= t *ctx, (virtual & 0x0001F000); /* Compute access rights */ ctx->prot =3D prot; - ret =3D check_prot(ctx->prot, access_type); - if (ret =3D=3D 0) { + if (CHECK_PROT_ACCESS(ctx->prot, access_type)) { qemu_log_mask(CPU_LOG_MMU, "BAT %d match: r " HWADDR_F= MT_plx " prot=3D%c%c\n", i, ctx->raddr, ctx->prot & PAGE_READ ? 'R' : '-', ctx->prot & PAGE_WRITE ? 'W' : '-'); + ret =3D 0; + } else { + ret =3D -2; } break; } @@ -540,9 +538,11 @@ static int mmu40x_get_physical_address(CPUPPCState *en= v, mmu_ctx_t *ctx, check_perms: /* Check from TLB entry */ ctx->prot =3D tlb->prot; - ret =3D check_prot(ctx->prot, access_type); - if (ret =3D=3D -2) { + if (CHECK_PROT_ACCESS(ctx->prot, access_type)) { + ret =3D 0; + } else { env->spr[SPR_40x_ESR] =3D 0; + ret =3D -2; } break; } @@ -607,7 +607,7 @@ static int mmubooke_check_tlb(CPUPPCState *env, ppcemb_= tlb_t *tlb, } else { *prot =3D (tlb->prot >> 4) & 0xF; } - if (*prot & prot_for_access_type(access_type)) { + if (CHECK_PROT_ACCESS(*prot, access_type)) { qemu_log_mask(CPU_LOG_MMU, "%s: good TLB!\n", __func__); return 0; } @@ -811,7 +811,7 @@ found_tlb: *prot |=3D PAGE_EXEC; } } - if (*prot & prot_for_access_type(access_type)) { + if (CHECK_PROT_ACCESS(*prot, access_type)) { qemu_log_mask(CPU_LOG_MMU, "%s: good TLB!\n", __func__); return 0; } --=20 2.30.9