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/*
* 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;
}
}
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