static int handle_lmsw(struct guest_info * info, struct x86_instr * dec_instr);
static int handle_clts(struct guest_info * info, struct x86_instr * dec_instr);
-
static int handle_mov_to_cr0(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr0_32(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr0_32pae(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr0_64(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr0_64compat(struct guest_info * info, struct x86_instr * dec_instr);
-
-static int handle_mov_to_cr3_32(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr3_32pae(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr3_64(struct guest_info * info, struct x86_instr * dec_instr);
-static int handle_mov_to_cr3_64compat(struct guest_info * info, struct x86_instr * dec_instr);
-
-
// First Attempt = 494 lines
ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
}
-
-
if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
PrintError("Could not decode instruction\n");
return -1;
+// The CR0 register only has flags in the low 32 bits
+// The hardware does a format check to make sure the high bits are zero
+// Because of this we can ignore the high 32 bits here
static int handle_mov_to_cr0(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintDebug("MOV2CR0\n");
-
- switch (info->cpu_mode) {
- case REAL:
- case PROTECTED:
- return handle_mov_to_cr0_32(info, dec_instr);
- case PROTECTED_PAE:
- return handle_mov_to_cr0_32pae(info, dec_instr);
- case LONG:
- return handle_mov_to_cr0_64(info, dec_instr);
- case LONG_32_COMPAT:
- return handle_mov_to_cr0_64compat(info, dec_instr);
- default:
- PrintError("Invalid CPU Operating Mode: %d\n", info->cpu_mode);
- return -1;
-
- }
-}
-
-static int handle_mov_to_cr0_32pae(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("32 bit PAE mov to CR0 not implemented\n");
- return -1;
-}
-
-static int handle_mov_to_cr0_64(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("64 bit mov to CR0 not implemented\n");
- return -1;
-}
-
-static int handle_mov_to_cr0_64compat(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("64 bit compatibility mode move to CR0 not implemented\n");
- return -1;
-}
-
-
-static int handle_mov_to_cr0_32(struct guest_info * info, struct x86_instr * dec_instr) {
// 32 bit registers
struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
struct cr0_32 * new_cr0 = (struct cr0_32 *)(dec_instr->src_operand.operand);
struct cr0_32 * guest_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
+ uint_t paging_transition = 0;
+
+ PrintDebug("MOV2CR0 (MODE=%s)\n", v3_cpu_mode_to_str(info->cpu_mode));
PrintDebug("OperandVal = %x, length=%d\n", *(uint_t *)new_cr0, dec_instr->src_operand.size);
PrintDebug("Old CR0=%x\n", *(uint_t *)shadow_cr0);
PrintDebug("Old Guest CR0=%x\n", *(uint_t *)guest_cr0);
+
+ // We detect if this is a paging transition
+ if (guest_cr0->pg != new_cr0->pg) {
+ paging_transition = 1;
+ }
+
// Guest always sees the value they wrote
*guest_cr0 = *new_cr0;
// Set the shadow register to catch non-virtualized flags
*shadow_cr0 = *guest_cr0;
-
- if (v3_get_mem_mode(info) == VIRTUAL_MEM) {
- /* struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
- info->ctrl_regs.cr3 = *(addr_t*)guest_cr3;
- */
- PrintDebug("Activating Shadow Page Tables\n");
+ // Paging is always enabled
+ shadow_cr0->pg = 1;
- if (v3_activate_shadow_pt(info) == -1) {
- PrintError("Failed to activate shadow page tables\n");
- return -1;
- }
- } else {
+ // Was there a paging transition
+ // Meaning we need to change the page tables
+ if (paging_transition) {
+ if (v3_get_mem_mode(info) == VIRTUAL_MEM) {
- if (v3_activate_passthrough_pt(info) == -1) {
- PrintError("Failed to activate passthrough page tables\n");
- return -1;
+ PrintDebug("Activating Shadow Page Tables\n");
+
+ if (v3_activate_shadow_pt(info) == -1) {
+ PrintError("Failed to activate shadow page tables\n");
+ return -1;
+ }
+ } else {
+
+ if (v3_activate_passthrough_pt(info) == -1) {
+ PrintError("Failed to activate passthrough page tables\n");
+ return -1;
+ }
}
- shadow_cr0->pg = 1;
}
-
- PrintDebug("New Guest CR0=%x\n",*(uint_t *)guest_cr0);
-
+
+ PrintDebug("New Guest CR0=%x\n",*(uint_t *)guest_cr0);
PrintDebug("New CR0=%x\n", *(uint_t *)shadow_cr0);
-
+
return 0;
}
struct cr0_32 * dst_reg = (struct cr0_32 *)(dec_instr.dst_operand.operand);
struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
- PrintDebug("MOVCR2\n");
+ PrintDebug("MOVCR2 (mode=%s)\n", info->cpu_mode);
if (info->shdw_pg_mode == SHADOW_PAGING) {
struct cr0_32 * guest_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
}
if (v3_opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) {
- PrintDebug("MOV2CR3\n");
-
- if (info->mem_mode == PHYSICAL_MEM) {
- // All we do is update the guest CR3
+ PrintDebug("MOV2CR3 (cpu_mode=%s)\n", v3_cpu_mode_to_str(info->cpu_mode));
+ if (info->shdw_pg_mode == SHADOW_PAGING) {
+ PrintDebug("Old Shadow CR3=%p; Old Guest CR3=%p\n",
+ (void *)(addr_t)(info->ctrl_regs.cr3),
+ (void*)(addr_t)(info->shdw_pg_state.guest_cr3));
+
+
+ // We update the guest CR3
if (info->cpu_mode == LONG) {
struct cr3_64 * new_cr3 = (struct cr3_64 *)(dec_instr.src_operand.operand);
struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->shdw_pg_state.guest_cr3);
struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
*guest_cr3 = *new_cr3;
}
-
- } else {
-
- switch (info->cpu_mode) {
- case PROTECTED:
- if (handle_mov_to_cr3_32(info, &dec_instr) == -1) {
- return -1;
- }
- break;
- case PROTECTED_PAE:
- if (handle_mov_to_cr3_32pae(info, &dec_instr) == -1) {
- return -1;
- }
- break;
- case LONG:
- if (handle_mov_to_cr3_64(info, &dec_instr) == -1) {
- return -1;
- }
- break;
- case LONG_32_COMPAT:
- if (handle_mov_to_cr3_64compat(info, &dec_instr) == -1) {
+
+ // If Paging is enabled in the guest then we need to change the shadow page tables
+ if (info->mem_mode == VIRTUAL_MEM) {
+ if (v3_activate_shadow_pt(info) == -1) {
+ PrintError("Failed to activate 32 bit shadow page table\n");
return -1;
}
- break;
- default:
- PrintError("Unhandled CPU mode: %d\n", info->cpu_mode);
- return -1;
+ }
+
+ PrintDebug("New Shadow CR3=%p; New Guest CR3=%p\n",
+ (void *)(addr_t)(info->ctrl_regs.cr3),
+ (void*)(addr_t)(info->shdw_pg_state.guest_cr3));
+
+ } else if (info->shdw_pg_mode == NESTED_PAGING) {
+
+ // This is just a passthrough operation which we probably don't need here
+ if (info->cpu_mode == LONG) {
+ struct cr3_64 * new_cr3 = (struct cr3_64 *)(dec_instr.src_operand.operand);
+ struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->ctrl_regs.cr3);
+ *guest_cr3 = *new_cr3;
+ } else {
+ struct cr3_32 * new_cr3 = (struct cr3_32 *)(dec_instr.src_operand.operand);
+ struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
+ *guest_cr3 = *new_cr3;
}
+
}
} else {
PrintError("Unhandled opcode in handle_cr3_write\n");
-
-
-
-
-static int handle_mov_to_cr3_32(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintDebug("CR3 at 0x%p\n", &(info->ctrl_regs.cr3));
-
- if (info->shdw_pg_mode == SHADOW_PAGING) {
- struct cr3_32 * new_cr3 = (struct cr3_32 *)(dec_instr->src_operand.operand);
- struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
-#ifdef DEBUG_CTRL_REGS
- struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
-#endif
-
- PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n",
- *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
-
-
- // Store the write value to virtualize CR3
- *guest_cr3 = *new_cr3;
-
- if (v3_activate_shadow_pt(info) == -1) {
- PrintError("Failed to activate 32 bit shadow page table\n");
- return -1;
- }
-
- PrintDebug("New Shadow CR3=%x; New Guest CR3=%x\n",
- *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
- }
- return 0;
-}
-
-
-static int handle_mov_to_cr3_32pae(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("32 Bit PAE mode Mov to CR3 not implemented\n");
- return -1;
-}
-
-static int handle_mov_to_cr3_64(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("Long mode Mov to CR3 not implemented\n");
- return -1;
-}
-
-static int handle_mov_to_cr3_64compat(struct guest_info * info, struct x86_instr * dec_instr) {
- PrintError("Long compatiblity mode move to CR3 not implemented\n");
- return -1;
-}
-
-
-
// first attempt = 156 lines
// current = 36 lines
int v3_handle_cr3_read(struct guest_info * info) {
ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
}
-
-
if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
PrintError("Could not decode instruction\n");
return -1;
}
if (v3_opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) {
- PrintDebug("MOVCR32\n");
- struct cr3_32 * dst_reg = (struct cr3_32 *)(dec_instr.dst_operand.operand);
-
- PrintDebug("CR3 at 0x%p\n", &(info->ctrl_regs.cr3));
+ PrintDebug("MOVCR32 (mode=%s)\n", v3_cpu_mode_to_str(info->cpu_mode));
if (info->shdw_pg_mode == SHADOW_PAGING) {
- *dst_reg = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
- } else {
- *dst_reg = *(struct cr3_32 *)&(info->ctrl_regs.cr3);
+
+ if (info->cpu_mode == LONG) {
+ struct cr3_64 * dst_reg = (struct cr3_64 *)(dec_instr.dst_operand.operand);
+ struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->shdw_pg_state.guest_cr3);
+ *dst_reg = *guest_cr3;
+ } else {
+ struct cr3_32 * dst_reg = (struct cr3_32 *)(dec_instr.dst_operand.operand);
+ struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
+ *dst_reg = *guest_cr3;
+ }
+
+ } else if (info->shdw_pg_mode == NESTED_PAGING) {
+
+ // This is just a passthrough operation which we probably don't need here
+ if (info->cpu_mode == LONG) {
+ struct cr3_64 * dst_reg = (struct cr3_64 *)(dec_instr.dst_operand.operand);
+ struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->ctrl_regs.cr3);
+ *dst_reg = *guest_cr3;
+ } else {
+ struct cr3_32 * dst_reg = (struct cr3_32 *)(dec_instr.dst_operand.operand);
+ struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
+ *dst_reg = *guest_cr3;
+ }
}
+
} else {
PrintError("Unhandled opcode in handle_cr3_read\n");
return -1;
