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target-i386: commonize checks for 2MB and 4KB pages

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-04-04 07:51:29 +02:00
parent 843408b3cf
commit 00cc3e1d70
1 changed files with 47 additions and 86 deletions
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59
target-i386/helper.c
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@ -634,50 +634,8 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
if (pde & PG_PSE_MASK) {
/* 2 MB page */
page_size = 2048 * 1024;
ptep ^= PG_NX_MASK;
if ((ptep & PG_NX_MASK) && is_write1 == 2) {
goto do_fault_protect;
}
switch (mmu_idx) {
case MMU_USER_IDX:
if (!(ptep & PG_USER_MASK)) {
goto do_fault_protect;
}
if (is_write && !(ptep & PG_RW_MASK)) {
goto do_fault_protect;
}
break;
case MMU_KSMAP_IDX:
if (is_write1 != 2 && (ptep & PG_USER_MASK)) {
goto do_fault_protect;
}
/* fall through */
case MMU_KNOSMAP_IDX:
if (is_write1 == 2 && (env->cr[4] & CR4_SMEP_MASK) &&
(ptep & PG_USER_MASK)) {
goto do_fault_protect;
}
if ((env->cr[0] & CR0_WP_MASK) &&
is_write && !(ptep & PG_RW_MASK)) {
goto do_fault_protect;
}
break;
default: /* cannot happen */
break;
}
is_dirty = is_write && !(pde & PG_DIRTY_MASK);
if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
pde |= PG_ACCESSED_MASK;
if (is_dirty) {
pde |= PG_DIRTY_MASK;
}
stl_phys_notdirty(cs->as, pde_addr, pde);
}
/* align to page_size */
pte = pde & ((PHYS_ADDR_MASK & ~(page_size - 1)) | 0xfff);
virt_addr = addr & ~(page_size - 1);
pte_addr = pde_addr;
pte = pde;
} else {
/* 4 KB page */
if (!(pde & PG_ACCESSED_MASK)) {
@ -697,9 +655,13 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
}
/* combine pde and pte nx, user and rw protections */
ptep &= pte ^ PG_NX_MASK;
page_size = 4096;
}
ptep ^= PG_NX_MASK;
if ((ptep & PG_NX_MASK) && is_write1 == 2)
if ((ptep & PG_NX_MASK) && is_write1 == 2) {
goto do_fault_protect;
}
switch (mmu_idx) {
case MMU_USER_IDX:
if (!(ptep & PG_USER_MASK)) {
@ -737,10 +699,9 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
}
stl_phys_notdirty(cs->as, pte_addr, pte);
}
page_size = 4096;
virt_addr = addr & ~0xfff;
pte = pte & (PHYS_ADDR_MASK | 0xfff);
}
/* align to page_size */
pte &= ((PHYS_ADDR_MASK & ~(page_size - 1)) | 0xfff);
virt_addr = addr & ~(page_size - 1);
} else {
uint32_t pde;