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 <bala...@eik.bme.hu> --- target/ppc/cpu_init.c | 5 +++++ 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, 25 insertions(+), 36 deletions(-) diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c index 92c71b2a09..e12f3b2f2d 100644 --- a/target/ppc/cpu_init.c +++ b/target/ppc/cpu_init.c @@ -7377,6 +7377,11 @@ 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); + /* CHECK_PROT_ACCESS relies on this MMU access and PAGE bits relation */ + qemu_build_assert(MMU_DATA_LOAD == 0 && MMU_DATA_STORE == 1 && + MMU_INST_FETCH == 2 && PAGE_READ == 1 && + PAGE_WRITE == 2 && PAGE_EXEC == 4); + cc->class_by_name = ppc_cpu_class_by_name; cc->has_work = ppc_cpu_has_work; cc->mmu_index = 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); -/** - * 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))) #ifndef CONFIG_USER_ONLY 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, target_ulong sr, } *prot = key ? PAGE_READ | PAGE_WRITE : PAGE_READ; - if (*prot & prot_for_access_type(access_type)) { + if (CHECK_PROT_ACCESS(*prot, access_type)) { *raddr = eaddr; return true; } @@ -364,7 +364,7 @@ bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type, if (env->nb_BATs != 0) { raddr = ppc_hash32_bat_lookup(cpu, eaddr, access_type, protp, mmu_idx); if (raddr != -1) { - if (prot_for_access_type(access_type) & ~*protp) { + if (!CHECK_PROT_ACCESS(*protp, access_type)) { if (guest_visible) { if (access_type == MMU_INST_FETCH) { cs->exception_index = POWERPC_EXCP_ISI; @@ -432,7 +432,7 @@ bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type, prot = ppc_hash32_pte_prot(mmu_idx, sr, pte); - 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, MMUAccessType access_type, amr_prot = ppc_hash64_amr_prot(cpu, pte); prot = exec_prot & pp_prot & amr_prot; - need_prot = prot_for_access_type(access_type); + need_prot = 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, MMUAccessType access_type, } /* 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 |= access_type == MMU_INST_FETCH ? SRR1_NOEXEC_GUARD : DSISR_PROTFAULT; diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c index c185827658..bcd20ddc7b 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 */ -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, target_ulong pte0, /* Keep the matching PTE information */ ctx->raddr = pte1; ctx->prot = ppc_hash32_pp_prot(ctx->key, pp, ctx->nx); - ret = check_prot(ctx->prot, access_type); - if (ret == 0) { + if (CHECK_PROT_ACCESS(ctx->prot, access_type)) { /* Access granted */ qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n"); + ret = 0; } else { /* Access right violation */ qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); + ret = -2; } } } @@ -314,12 +310,14 @@ static int get_bat_6xx_tlb(CPUPPCState *env, mmu_ctx_t *ctx, (virtual & 0x0001F000); /* Compute access rights */ ctx->prot = prot; - ret = check_prot(ctx->prot, access_type); - if (ret == 0) { + if (CHECK_PROT_ACCESS(ctx->prot, access_type)) { qemu_log_mask(CPU_LOG_MMU, "BAT %d match: r " HWADDR_FMT_plx " prot=%c%c\n", i, ctx->raddr, ctx->prot & PAGE_READ ? 'R' : '-', ctx->prot & PAGE_WRITE ? 'W' : '-'); + ret = 0; + } else { + ret = -2; } break; } @@ -537,9 +535,11 @@ static int mmu40x_get_physical_address(CPUPPCState *env, hwaddr *raddr, check_perms: /* Check from TLB entry */ *prot = tlb->prot; - ret = check_prot(*prot, access_type); - if (ret == -2) { + if (CHECK_PROT_ACCESS(*prot, access_type)) { + ret = 0; + } else { env->spr[SPR_40x_ESR] = 0; + ret = -2; } break; } @@ -597,7 +597,7 @@ static int mmubooke_check_tlb(CPUPPCState *env, ppcemb_tlb_t *tlb, } else { *prot = (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; } @@ -799,7 +799,7 @@ found_tlb: *prot |= 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; } -- 2.30.9