NX support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1677 c046a42c-6fe2-441c-8c8c-71466251a162

NX support
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1677 c046a42c-6fe2-441c-8c8c-71466251a162
bellard
1 parent 84b7b8e7
Showing 1 changed file with 120 additions and 40 deletions
target-i386/helper2.c
@@ -127,7 +127,7 @@ CPUX86State *cpu_x86_init(void)
         /* currently not enabled for std i386 because not fully tested */
         env->cpuid_features |= CPUID_APIC;
         env->cpuid_ext2_features = (env->cpuid_features & 0x0183F3FF);
-        env->cpuid_ext2_features |= CPUID_EXT2_LM | CPUID_EXT2_SYSCALL;
+        env->cpuid_ext2_features |= CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX;
         env->cpuid_xlevel = 0x80000008;
         /* these features are needed for Win64 and aren't fully implemented */
@@ -576,6 +576,8 @@ target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
 #else
+#define PHYS_ADDR_MASK 0xfffff000
+
 /* return value:
    -1 = cannot handle fault 
    0  = nothing more to do 
@@ -583,37 +585,38 @@ target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
    2  = soft MMU activation required for this block
 */
 int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr, 
-                             int is_write, int is_user, int is_softmmu)
+                             int is_write1, int is_user, int is_softmmu)
 {
+    uint64_t ptep, pte;
     uint32_t pdpe_addr, pde_addr, pte_addr;
-    uint32_t pde, pte, ptep, pdpe;
-    int error_code, is_dirty, prot, page_size, ret;
+    int error_code, is_dirty, prot, page_size, ret, is_write;
     unsigned long paddr, page_offset;
     target_ulong vaddr, virt_addr;
 #if defined(DEBUG_MMU)
     printf("MMU fault: addr=" TARGET_FMT_lx " w=%d u=%d eip=" TARGET_FMT_lx "\n", 
-           addr, is_write, is_user, env->eip);
+           addr, is_write1, is_user, env->eip);
 #endif
-    is_write &= 1;
+    is_write = is_write1 & 1;
     if (!(env->cr[0] & CR0_PG_MASK)) {
         pte = addr;
         virt_addr = addr & TARGET_PAGE_MASK;
-        prot = PAGE_READ | PAGE_WRITE;
+        prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
         page_size = 4096;
         goto do_mapping;
     }
     if (env->cr[4] & CR4_PAE_MASK) {
+        uint64_t pde, pdpe;
+
         /* XXX: we only use 32 bit physical addresses */
 #ifdef TARGET_X86_64
         if (env->hflags & HF_LMA_MASK) {
-            uint32_t pml4e_addr, pml4e;
+            uint32_t pml4e_addr;
+            uint64_t pml4e;
             int32_t sext;
-            /* XXX: handle user + rw rights */
-            /* XXX: handle NX flag */
             /* test virtual address sign extension */
             sext = (int64_t)addr >> 47;
             if (sext != 0 && sext != -1) {
@@ -623,61 +626,134 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
             pml4e_addr = ((env->cr[3] & ~0xfff) + (((addr >> 39) & 0x1ff) << 3)) & 
                 env->a20_mask;
-            pml4e = ldl_phys(pml4e_addr);
+            pml4e = ldq_phys(pml4e_addr);
             if (!(pml4e & PG_PRESENT_MASK)) {
                 error_code = 0;
                 goto do_fault;
             }
+            if (!(env->efer & MSR_EFER_NXE) && (pml4e & PG_NX_MASK)) {
+                error_code = PG_ERROR_RSVD_MASK;
+                goto do_fault;
+            }
             if (!(pml4e & PG_ACCESSED_MASK)) {
                 pml4e |= PG_ACCESSED_MASK;
                 stl_phys_notdirty(pml4e_addr, pml4e);
             }
-            
-            pdpe_addr = ((pml4e & ~0xfff) + (((addr >> 30) & 0x1ff) << 3)) & 
+            ptep = pml4e ^ PG_NX_MASK;
+            pdpe_addr = ((pml4e & PHYS_ADDR_MASK) + (((addr >> 30) & 0x1ff) << 3)) & 
                 env->a20_mask;
-            pdpe = ldl_phys(pdpe_addr);
+            pdpe = ldq_phys(pdpe_addr);
             if (!(pdpe & PG_PRESENT_MASK)) {
                 error_code = 0;
                 goto do_fault;
             }
+            if (!(env->efer & MSR_EFER_NXE) && (pdpe & PG_NX_MASK)) {
+                error_code = PG_ERROR_RSVD_MASK;
+                goto do_fault;
+            }
+            ptep &= pdpe ^ PG_NX_MASK;
             if (!(pdpe & PG_ACCESSED_MASK)) {
                 pdpe |= PG_ACCESSED_MASK;
                 stl_phys_notdirty(pdpe_addr, pdpe);
             }
-        } else 
+        } else
 #endif
         {
+            /* XXX: load them when cr3 is loaded ? */
             pdpe_addr = ((env->cr[3] & ~0x1f) + ((addr >> 30) << 3)) & 
                 env->a20_mask;
-            pdpe = ldl_phys(pdpe_addr);
+            pdpe = ldq_phys(pdpe_addr);
             if (!(pdpe & PG_PRESENT_MASK)) {
                 error_code = 0;
                 goto do_fault;
             }
+            ptep = PG_NX_MASK | PG_USER_MASK | PG_RW_MASK;
         }
-        pde_addr = ((pdpe & ~0xfff) + (((addr >> 21) & 0x1ff) << 3)) &
+        pde_addr = ((pdpe & PHYS_ADDR_MASK) + (((addr >> 21) & 0x1ff) << 3)) &
             env->a20_mask;
-        pde = ldl_phys(pde_addr);
+        pde = ldq_phys(pde_addr);
         if (!(pde & PG_PRESENT_MASK)) {
             error_code = 0;
             goto do_fault;
         }
+        if (!(env->efer & MSR_EFER_NXE) && (pde & PG_NX_MASK)) {
+            error_code = PG_ERROR_RSVD_MASK;
+            goto do_fault;
+        }
+        ptep &= pde ^ PG_NX_MASK;
         if (pde & PG_PSE_MASK) {
             /* 2 MB page */
             page_size = 2048 * 1024;
-            goto handle_big_page;
+            ptep ^= PG_NX_MASK;
+            if ((ptep & PG_NX_MASK) && is_write1 == 2)
+                goto do_fault_protect;
+            if (is_user) {
+                if (!(ptep & PG_USER_MASK))
+                    goto do_fault_protect;
+                if (is_write && !(ptep & PG_RW_MASK))
+                    goto do_fault_protect;
+            } else {
+                if ((env->cr[0] & CR0_WP_MASK) && 
+                    is_write && !(ptep & PG_RW_MASK)) 
+                    goto do_fault_protect;
+            }
+            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(pde_addr, pde);
+            }
+            /* align to page_size */
+            pte = pde & ((PHYS_ADDR_MASK & ~(page_size - 1)) | 0xfff); 
+            virt_addr = addr & ~(page_size - 1);
         } else {
             /* 4 KB page */
             if (!(pde & PG_ACCESSED_MASK)) {
                 pde |= PG_ACCESSED_MASK;
                 stl_phys_notdirty(pde_addr, pde);
             }
-            pte_addr = ((pde & ~0xfff) + (((addr >> 12) & 0x1ff) << 3)) &
+            pte_addr = ((pde & PHYS_ADDR_MASK) + (((addr >> 12) & 0x1ff) << 3)) &
                 env->a20_mask;
-            goto handle_4k_page;
+            pte = ldq_phys(pte_addr);
+            if (!(pte & PG_PRESENT_MASK)) {
+                error_code = 0;
+                goto do_fault;
+            }
+            if (!(env->efer & MSR_EFER_NXE) && (pte & PG_NX_MASK)) {
+                error_code = PG_ERROR_RSVD_MASK;
+                goto do_fault;
+            }
+            /* combine pde and pte nx, user and rw protections */
+            ptep &= pte ^ PG_NX_MASK;
+            ptep ^= PG_NX_MASK;
+            if ((ptep & PG_NX_MASK) && is_write1 == 2)
+                goto do_fault_protect; 
+            if (is_user) {
+                if (!(ptep & PG_USER_MASK))
+                    goto do_fault_protect;
+                if (is_write && !(ptep & PG_RW_MASK))
+                    goto do_fault_protect;
+            } else {
+                if ((env->cr[0] & CR0_WP_MASK) &&
+                    is_write && !(ptep & PG_RW_MASK)) 
+                    goto do_fault_protect;
+            }
+            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(pte_addr, pte);
+            }
+            page_size = 4096;
+            virt_addr = addr & ~0xfff;
+            pte = pte & (PHYS_ADDR_MASK | 0xfff);
         }
     } else {
+        uint32_t pde;
+
         /* page directory entry */
         pde_addr = ((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & 
             env->a20_mask;
@@ -689,7 +765,6 @@ 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;
-        handle_big_page:
             if (is_user) {
                 if (!(pde & PG_USER_MASK))
                     goto do_fault_protect;
@@ -720,7 +795,6 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
             /* page directory entry */
             pte_addr = ((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & 
                 env->a20_mask;
-        handle_4k_page:
             pte = ldl_phys(pte_addr);
             if (!(pte & PG_PRESENT_MASK)) {
                 error_code = 0;
@@ -748,20 +822,21 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
             page_size = 4096;
             virt_addr = addr & ~0xfff;
         }
-
-        /* the page can be put in the TLB */
-        prot = PAGE_READ;
-        if (pte & PG_DIRTY_MASK) {
-            /* only set write access if already dirty... otherwise wait
-               for dirty access */
-            if (is_user) {
-                if (ptep & PG_RW_MASK)
-                    prot |= PAGE_WRITE;
-            } else {
-                if (!(env->cr[0] & CR0_WP_MASK) ||
-                    (ptep & PG_RW_MASK))
-                    prot |= PAGE_WRITE;
-            }
+    }
+    /* the page can be put in the TLB */
+    prot = PAGE_READ;
+    if (!(ptep & PG_NX_MASK))
+        prot |= PAGE_EXEC;
+    if (pte & PG_DIRTY_MASK) {
+        /* only set write access if already dirty... otherwise wait
+           for dirty access */
+        if (is_user) {
+            if (ptep & PG_RW_MASK)
+                prot |= PAGE_WRITE;
+        } else {
+            if (!(env->cr[0] & CR0_WP_MASK) ||
+                (ptep & PG_RW_MASK))
+                prot |= PAGE_WRITE;
         }
     }
  do_mapping:
@@ -773,15 +848,20 @@ int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
     paddr = (pte & TARGET_PAGE_MASK) + page_offset;
     vaddr = virt_addr + page_offset;
-    ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu);
+    ret = tlb_set_page_exec(env, vaddr, paddr, prot, is_user, is_softmmu);
     return ret;
  do_fault_protect:
     error_code = PG_ERROR_P_MASK;
  do_fault:
     env->cr[2] = addr;
-    env->error_code = (is_write << PG_ERROR_W_BIT) | error_code;
+    error_code |= (is_write << PG_ERROR_W_BIT);
     if (is_user)
-        env->error_code |= PG_ERROR_U_MASK;
+        error_code |= PG_ERROR_U_MASK;
+    if (is_write1 == 2 && 
+        (env->efer & MSR_EFER_NXE) && 
+        (env->cr[4] & CR4_PAE_MASK))
+        error_code |= PG_ERROR_I_D_MASK;
+    env->error_code = error_code;
     return 1;
 }