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

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-04-04 07:57:02 +02:00
parent 00cc3e1d70
commit 487cad8853
1 changed files with 43 additions and 79 deletions
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122
target-i386/helper.c
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@ -716,47 +716,9 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
/* if PSE bit is set, then we use a 4MB page */
if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) {
page_size = 4096 * 1024;
switch (mmu_idx) {
case MMU_USER_IDX:
if (!(pde & PG_USER_MASK)) {
goto do_fault_protect;
}
if (is_write && !(pde & PG_RW_MASK)) {
goto do_fault_protect;
}
break;
case MMU_KSMAP_IDX:
if (is_write1 != 2 && (pde & PG_USER_MASK)) {
goto do_fault_protect;
}
/* fall through */
case MMU_KNOSMAP_IDX:
if (is_write1 == 2 && (env->cr[4] & CR4_SMEP_MASK) &&
(pde & PG_USER_MASK)) {
goto do_fault_protect;
}
if ((env->cr[0] & CR0_WP_MASK) &&
is_write && !(pde & 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);
}
pte = pde & ~((page_size - 1) & ~0xfff); /* align to page_size */
ptep = pte;
virt_addr = addr & ~(page_size - 1);
ptep = pde;
pte_addr = pde_addr;
pte = pde;
} else {
if (!(pde & PG_ACCESSED_MASK)) {
pde |= PG_ACCESSED_MASK;
@ -773,46 +735,48 @@ int x86_cpu_handle_mmu_fault(CPUState *cs, vaddr addr,
}
/* combine pde and pte user and rw protections */
ptep = pte & pde;
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 && !(pte & PG_DIRTY_MASK);
if (!(pte & PG_ACCESSED_MASK) || is_dirty) {
pte |= PG_ACCESSED_MASK;
if (is_dirty) {
pte |= PG_DIRTY_MASK;
}
stl_phys_notdirty(cs->as, pte_addr, pte);
}
page_size = 4096;
virt_addr = addr & ~0xfff;
}
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 && !(pte & PG_DIRTY_MASK);
if (!(pte & PG_ACCESSED_MASK) || is_dirty) {
pte |= PG_ACCESSED_MASK;
if (is_dirty) {
pte |= PG_DIRTY_MASK;
}
stl_phys_notdirty(cs->as, pte_addr, pte);
}
/* align to page_size */
pte &= ~((page_size - 1) & ~0xfff);
virt_addr = addr & ~(page_size - 1);
}
/* the page can be put in the TLB */
prot = PAGE_READ;