| /* |
| * x86 MPX helpers |
| * |
| * Copyright (c) 2015 Red Hat, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "cpu.h" |
| #include "exec/helper-proto.h" |
| #include "exec/cpu_ldst.h" |
| |
| |
| void cpu_sync_bndcs_hflags(CPUX86State *env) |
| { |
| uint32_t hflags = env->hflags; |
| uint32_t hflags2 = env->hflags2; |
| uint32_t bndcsr; |
| |
| if ((hflags & HF_CPL_MASK) == 3) { |
| bndcsr = env->bndcs_regs.cfgu; |
| } else { |
| bndcsr = env->msr_bndcfgs; |
| } |
| |
| if ((env->cr[4] & CR4_OSXSAVE_MASK) |
| && (env->xcr0 & XSTATE_BNDCSR) |
| && (bndcsr & BNDCFG_ENABLE)) { |
| hflags |= HF_MPX_EN_MASK; |
| } else { |
| hflags &= ~HF_MPX_EN_MASK; |
| } |
| |
| if (bndcsr & BNDCFG_BNDPRESERVE) { |
| hflags2 |= HF2_MPX_PR_MASK; |
| } else { |
| hflags2 &= ~HF2_MPX_PR_MASK; |
| } |
| |
| env->hflags = hflags; |
| env->hflags2 = hflags2; |
| } |
| |
| void helper_bndck(CPUX86State *env, uint32_t fail) |
| { |
| if (unlikely(fail)) { |
| env->bndcs_regs.sts = 1; |
| raise_exception_ra(env, EXCP05_BOUND, GETPC()); |
| } |
| } |
| |
| static uint64_t lookup_bte64(CPUX86State *env, uint64_t base, uintptr_t ra) |
| { |
| uint64_t bndcsr, bde, bt; |
| |
| if ((env->hflags & HF_CPL_MASK) == 3) { |
| bndcsr = env->bndcs_regs.cfgu; |
| } else { |
| bndcsr = env->msr_bndcfgs; |
| } |
| |
| bde = (extract64(base, 20, 28) << 3) + (extract64(bndcsr, 20, 44) << 12); |
| bt = cpu_ldq_data_ra(env, bde, ra); |
| if ((bt & 1) == 0) { |
| env->bndcs_regs.sts = bde | 2; |
| raise_exception_ra(env, EXCP05_BOUND, ra); |
| } |
| |
| return (extract64(base, 3, 17) << 5) + (bt & ~7); |
| } |
| |
| static uint32_t lookup_bte32(CPUX86State *env, uint32_t base, uintptr_t ra) |
| { |
| uint32_t bndcsr, bde, bt; |
| |
| if ((env->hflags & HF_CPL_MASK) == 3) { |
| bndcsr = env->bndcs_regs.cfgu; |
| } else { |
| bndcsr = env->msr_bndcfgs; |
| } |
| |
| bde = (extract32(base, 12, 20) << 2) + (bndcsr & TARGET_PAGE_MASK); |
| bt = cpu_ldl_data_ra(env, bde, ra); |
| if ((bt & 1) == 0) { |
| env->bndcs_regs.sts = bde | 2; |
| raise_exception_ra(env, EXCP05_BOUND, ra); |
| } |
| |
| return (extract32(base, 2, 10) << 4) + (bt & ~3); |
| } |
| |
| uint64_t helper_bndldx64(CPUX86State *env, target_ulong base, target_ulong ptr) |
| { |
| uintptr_t ra = GETPC(); |
| uint64_t bte, lb, ub, pt; |
| |
| bte = lookup_bte64(env, base, ra); |
| lb = cpu_ldq_data_ra(env, bte, ra); |
| ub = cpu_ldq_data_ra(env, bte + 8, ra); |
| pt = cpu_ldq_data_ra(env, bte + 16, ra); |
| |
| if (pt != ptr) { |
| lb = ub = 0; |
| } |
| env->mmx_t0.MMX_Q(0) = ub; |
| return lb; |
| } |
| |
| uint64_t helper_bndldx32(CPUX86State *env, target_ulong base, target_ulong ptr) |
| { |
| uintptr_t ra = GETPC(); |
| uint32_t bte, lb, ub, pt; |
| |
| bte = lookup_bte32(env, base, ra); |
| lb = cpu_ldl_data_ra(env, bte, ra); |
| ub = cpu_ldl_data_ra(env, bte + 4, ra); |
| pt = cpu_ldl_data_ra(env, bte + 8, ra); |
| |
| if (pt != ptr) { |
| lb = ub = 0; |
| } |
| return ((uint64_t)ub << 32) | lb; |
| } |
| |
| void helper_bndstx64(CPUX86State *env, target_ulong base, target_ulong ptr, |
| uint64_t lb, uint64_t ub) |
| { |
| uintptr_t ra = GETPC(); |
| uint64_t bte; |
| |
| bte = lookup_bte64(env, base, ra); |
| cpu_stq_data_ra(env, bte, lb, ra); |
| cpu_stq_data_ra(env, bte + 8, ub, ra); |
| cpu_stq_data_ra(env, bte + 16, ptr, ra); |
| } |
| |
| void helper_bndstx32(CPUX86State *env, target_ulong base, target_ulong ptr, |
| uint64_t lb, uint64_t ub) |
| { |
| uintptr_t ra = GETPC(); |
| uint32_t bte; |
| |
| bte = lookup_bte32(env, base, ra); |
| cpu_stl_data_ra(env, bte, lb, ra); |
| cpu_stl_data_ra(env, bte + 4, ub, ra); |
| cpu_stl_data_ra(env, bte + 8, ptr, ra); |
| } |
| |
| void helper_bnd_jmp(CPUX86State *env) |
| { |
| if (!(env->hflags2 & HF2_MPX_PR_MASK)) { |
| memset(env->bnd_regs, 0, sizeof(env->bnd_regs)); |
| env->hflags &= ~HF_MPX_IU_MASK; |
| } |
| } |