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Diffstat (limited to 'target-i386/helper.c')
-rw-r--r--target-i386/helper.c150
1 files changed, 121 insertions, 29 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 8a5da3d7c0..c635667d60 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -443,17 +443,27 @@ void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4)
#if defined(DEBUG_MMU)
printf("CR4 update: CR4=%08x\n", (uint32_t)env->cr[4]);
#endif
- if ((new_cr4 & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK)) !=
- (env->cr[4] & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK))) {
+ if ((new_cr4 ^ env->cr[4]) &
+ (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK |
+ CR4_SMEP_MASK | CR4_SMAP_MASK)) {
tlb_flush(env, 1);
}
/* SSE handling */
- if (!(env->cpuid_features & CPUID_SSE))
+ if (!(env->cpuid_features & CPUID_SSE)) {
new_cr4 &= ~CR4_OSFXSR_MASK;
- if (new_cr4 & CR4_OSFXSR_MASK)
+ }
+ env->hflags &= ~HF_OSFXSR_MASK;
+ if (new_cr4 & CR4_OSFXSR_MASK) {
env->hflags |= HF_OSFXSR_MASK;
- else
- env->hflags &= ~HF_OSFXSR_MASK;
+ }
+
+ if (!(env->cpuid_7_0_ebx_features & CPUID_7_0_EBX_SMAP)) {
+ new_cr4 &= ~CR4_SMAP_MASK;
+ }
+ env->hflags &= ~HF_SMAP_MASK;
+ if (new_cr4 & CR4_SMAP_MASK) {
+ env->hflags |= HF_SMAP_MASK;
+ }
env->cr[4] = new_cr4;
}
@@ -591,17 +601,38 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
/* 2 MB page */
page_size = 2048 * 1024;
ptep ^= PG_NX_MASK;
- if ((ptep & PG_NX_MASK) && is_write1 == 2)
+ if ((ptep & PG_NX_MASK) && is_write1 == 2) {
goto do_fault_protect;
- if (is_user) {
- if (!(ptep & PG_USER_MASK))
+ }
+ switch (mmu_idx) {
+ case MMU_USER_IDX:
+ if (!(ptep & PG_USER_MASK)) {
goto do_fault_protect;
- if (is_write && !(ptep & PG_RW_MASK))
+ }
+ if (is_write && !(ptep & PG_RW_MASK)) {
goto do_fault_protect;
- } else {
+ }
+ break;
+
+ case MMU_KERNEL_IDX:
+ if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) &&
+ (ptep & PG_USER_MASK)) {
+ goto do_fault_protect;
+ }
+ /* fall through */
+ case MMU_KSMAP_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))
+ 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) {
@@ -635,15 +666,35 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
ptep ^= PG_NX_MASK;
if ((ptep & PG_NX_MASK) && is_write1 == 2)
goto do_fault_protect;
- if (is_user) {
- if (!(ptep & PG_USER_MASK))
+ switch (mmu_idx) {
+ case MMU_USER_IDX:
+ if (!(ptep & PG_USER_MASK)) {
goto do_fault_protect;
- if (is_write && !(ptep & PG_RW_MASK))
+ }
+ if (is_write && !(ptep & PG_RW_MASK)) {
goto do_fault_protect;
- } else {
+ }
+ break;
+
+ case MMU_KERNEL_IDX:
+ if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) &&
+ (ptep & PG_USER_MASK)) {
+ goto do_fault_protect;
+ }
+ /* fall through */
+ case MMU_KSMAP_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))
+ 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) {
@@ -670,15 +721,35 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong 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;
- if (is_user) {
- if (!(pde & PG_USER_MASK))
+ switch (mmu_idx) {
+ case MMU_USER_IDX:
+ if (!(pde & PG_USER_MASK)) {
goto do_fault_protect;
- if (is_write && !(pde & PG_RW_MASK))
+ }
+ if (is_write && !(pde & PG_RW_MASK)) {
goto do_fault_protect;
- } else {
+ }
+ break;
+
+ case MMU_KERNEL_IDX:
+ if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) &&
+ (pde & PG_USER_MASK)) {
+ goto do_fault_protect;
+ }
+ /* fall through */
+ case MMU_KSMAP_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))
+ 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) {
@@ -707,15 +778,35 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
}
/* combine pde and pte user and rw protections */
ptep = pte & pde;
- if (is_user) {
- if (!(ptep & PG_USER_MASK))
+ switch (mmu_idx) {
+ case MMU_USER_IDX:
+ if (!(ptep & PG_USER_MASK)) {
goto do_fault_protect;
- if (is_write && !(ptep & PG_RW_MASK))
+ }
+ if (is_write && !(ptep & PG_RW_MASK)) {
goto do_fault_protect;
- } else {
+ }
+ break;
+
+ case MMU_KERNEL_IDX:
+ if (is_write1 != 2 && (env->cr[4] & CR4_SMAP_MASK) &&
+ (ptep & PG_USER_MASK)) {
+ goto do_fault_protect;
+ }
+ /* fall through */
+ case MMU_KSMAP_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))
+ 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) {
@@ -762,8 +853,9 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
if (is_user)
error_code |= PG_ERROR_U_MASK;
if (is_write1 == 2 &&
- (env->efer & MSR_EFER_NXE) &&
- (env->cr[4] & CR4_PAE_MASK))
+ (((env->efer & MSR_EFER_NXE) &&
+ (env->cr[4] & CR4_PAE_MASK)) ||
+ (env->cr[4] & CR4_SMEP_MASK)))
error_code |= PG_ERROR_I_D_MASK;
if (env->intercept_exceptions & (1 << EXCP0E_PAGE)) {
/* cr2 is not modified in case of exceptions */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-21 03:24:37 +0000