1 #include <palacios/vmm_mem.h>
2 #include <palacios/vmm.h>
3 #include <palacios/vmcb.h>
4 #include <palacios/vmm_decoder.h>
5 #include <palacios/vm_guest_mem.h>
6 #include <palacios/vmm_ctrl_regs.h>
10 extern void SerialMemDump(unsigned char *start, int n);
12 /* Segmentation is a problem here...
14 * When we get a memory operand, presumably we use the default segment (which is?)
15 * unless an alternate segment was specfied in the prefix...
19 int handle_cr0_write(struct guest_info * info) {
23 switch (info->cpu_mode) {
29 PrintDebug("Real Mode write to CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs)));
31 // The real rip address is actually a combination of the rip + CS base
32 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
34 // I think we should inject a GPF into the guest
35 PrintDebug("Could not read instruction (ret=%d)\n", ret);
39 while (is_prefix_byte(instr[index])) {
43 if ((instr[index] == cr_access_byte) &&
44 (instr[index + 1] == lmsw_byte) &&
45 (MODRM_REG(instr[index + 2]) == lmsw_reg_byte)) {
48 addr_t second_operand;
49 struct cr0_real *real_cr0;
50 struct cr0_real *new_cr0;
51 operand_type_t addr_type;
57 real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0);
59 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16);
62 if (addr_type == REG_OPERAND) {
63 new_cr0 = (struct cr0_real *)first_operand;
64 } else if (addr_type == MEM_OPERAND) {
67 if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) {
72 new_cr0 = (struct cr0_real *)host_addr;
74 PrintDebug("Memory operand in real mode write to CR0 is UNIMPLEMENTED\n");
75 // error... don't know what to do
79 if ((new_cr0->pe == 1) && (real_cr0->pe == 0)) {
80 info->cpu_mode = PROTECTED;
81 } else if ((new_cr0->pe == 0) && (real_cr0->pe == 1)) {
82 info->cpu_mode = REAL;
85 new_cr0_val = *(char*)(new_cr0) & 0x0f;
88 if (info->page_mode == SHADOW_PAGING) {
89 struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0);
91 PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
92 /* struct cr0_real is only 4 bits wide,
93 * so we can overwrite the real_cr0 without worrying about the shadow fields
95 *(char*)real_cr0 &= 0xf0;
96 *(char*)real_cr0 |= new_cr0_val;
98 *(char*)shadow_cr0 &= 0xf0;
99 *(char*)shadow_cr0 |= new_cr0_val;
101 PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
103 PrintDebug("Old CR0=%x\n", *real_cr0);
104 // for now we just pass through....
105 *(char*)real_cr0 &= 0xf0;
106 *(char*)real_cr0 |= new_cr0_val;
108 PrintDebug("New CR0=%x\n", *real_cr0);
114 } else if ((instr[index] == cr_access_byte) &&
115 (instr[index + 1] == clts_byte)) {
117 PrintDebug("CLTS unhandled in CR0 write\n");
120 } else if ((instr[index] == cr_access_byte) &&
121 (instr[index + 1] = mov_to_cr_byte)) {
122 addr_t first_operand;
123 addr_t second_operand;
124 struct cr0_32 *real_cr0;
125 struct cr0_32 *new_cr0;
126 operand_type_t addr_type;
131 real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
133 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
135 if (addr_type != REG_OPERAND) {
136 PrintDebug("Moving to CR0 from non-register operand in CR0 write\n");
137 /* Mov to CR0 Can only be a 32 bit register */
142 new_cr0 = (struct cr0_32 *)first_operand;
144 if (new_cr0->pe == 1) {
145 PrintDebug("Entering Protected Mode\n");
146 info->cpu_mode = PROTECTED;
149 if (new_cr0->pg == 1) {
150 PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n");
156 if (info->page_mode == SHADOW_PAGING) {
157 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
159 PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
160 *real_cr0 = *new_cr0;
163 *shadow_cr0 = *new_cr0;
165 PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
167 PrintDebug("Old CR0=%x\n", *real_cr0);
168 *real_cr0 = *new_cr0;
169 PrintDebug("New CR0=%x\n", *real_cr0);
175 PrintDebug("Unsupported Instruction\n");
176 // unsupported instruction, UD the guest
190 PrintDebug("Protected %s Mode write to CR0 at guest %s linear rip 0x%x\n",
191 info->cpu_mode==PROTECTED_PG ? "Paged" : "",
192 info->cpu_mode==PROTECTED_PG ? "virtual" : "",
193 get_addr_linear(info,info->rip,&(info->segments.cs)));
195 // OK, now we will read the instruction
196 // The only difference between PROTECTED and PROTECTED_PG is whether we read
197 // from guest_pa or guest_va
198 if (info->cpu_mode==PROTECTED) {
199 // The real rip address is actually a combination of the rip + CS base
200 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
201 } else { //PROTECTED_PG
202 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
206 // I think we should inject a GPF into the guest
207 PrintDebug("Could not read instruction (ret=%d)\n", ret);
211 while (is_prefix_byte(instr[index])) {
215 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
217 struct cr0_32 * real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
219 if ((instr[index] == cr_access_byte) &&
220 (instr[index + 1] == mov_to_cr_byte)) {
224 addr_t first_operand;
225 addr_t second_operand;
226 struct cr0_32 *new_cr0;
227 operand_type_t addr_type;
232 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
234 if (addr_type != REG_OPERAND) {
235 PrintDebug("Non-register operand in write to CR0\n");
239 new_cr0 = (struct cr0_32 *)first_operand;
243 if (info->page_mode == SHADOW_PAGING) {
244 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
246 if (new_cr0->pg == 1){
247 // This should be new_cr0->pg && !(old_cr->pg), right?
248 // and then a case for turning paging off?
250 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
252 info->cpu_mode = PROTECTED_PG;
254 *shadow_cr0 = *new_cr0;
255 *real_cr0 = *new_cr0;
258 // Activate Shadow Paging
260 PrintDebug("Turning on paging in the guest\n");
262 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
265 } else if (new_cr0->pe == 0) {
266 info->cpu_mode = REAL;
268 *shadow_cr0 = *new_cr0;
269 *real_cr0 = *new_cr0;
275 *real_cr0 = *new_cr0;
280 } else if ((instr[index] == 0x0f) &&
281 (instr[index + 1] == 0x06)) {
283 PrintDebug("CLTS instruction - clearing TS flag of real and shadow CR0\n");
292 PrintDebug("Unkown instruction: \n");
293 SerialMemDump(instr,15);
300 PrintDebug("Protected PAE Mode write to CR0 is UNIMPLEMENTED\n");
303 case PROTECTED_PAE_PG:
304 PrintDebug("Protected PAE Paged Mode write to CR0 is UNIMPLEMENTED\n");
308 PrintDebug("Protected Long Mode write to CR0 is UNIMPLEMENTED\n");
312 PrintDebug("Protected Long Paged Mode write to CR0 is UNIMPLEMENTED\n");
317 PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode);
328 int handle_cr0_read(struct guest_info * info) {
331 switch (info->cpu_mode) {
339 PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs)));
341 // The real rip address is actually a combination of the rip + CS base
342 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
344 // I think we should inject a GPF into the guest
345 PrintDebug("Could not read Real Mode instruction (ret=%d)\n", ret);
350 while (is_prefix_byte(instr[index])) {
354 if ((instr[index] == cr_access_byte) &&
355 (instr[index + 1] == smsw_byte) &&
356 (MODRM_REG(instr[index + 2]) == smsw_reg_byte)) {
358 // SMSW (store machine status word)
360 addr_t first_operand;
361 addr_t second_operand;
362 struct cr0_real *cr0;
363 operand_type_t addr_type;
368 cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0);
371 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16);
373 if (addr_type == MEM_OPERAND) {
376 if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) {
378 PrintDebug("Could not convert guest physical address to host virtual address\n");
382 first_operand = host_addr;
388 cr0_val = *(char*)cr0 & 0x0f;
390 *(char *)first_operand &= 0xf0;
391 *(char *)first_operand |= cr0_val;
393 PrintDebug("index = %d, rip = %x\n", index, (ulong_t)(info->rip));
395 PrintDebug("new_rip = %x\n", (ulong_t)(info->rip));
398 } else if ((instr[index] == cr_access_byte) &&
399 (instr[index+1] == mov_from_cr_byte)) {
401 * This can only take a 32 bit register argument in anything less than 64 bit mode.
403 addr_t first_operand;
404 addr_t second_operand;
405 operand_type_t addr_type;
407 struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
411 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
413 struct cr0_32 * virt_cr0 = (struct cr0_32 *)first_operand;
415 if (addr_type != REG_OPERAND) {
416 // invalid opcode to guest
417 PrintDebug("Invalid operand type in mov from CR0\n");
421 if (info->page_mode == SHADOW_PAGING) {
422 *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
424 *virt_cr0 = *real_cr0;
430 PrintDebug("Unknown read instr from CR0\n");
445 PrintDebug("Protected %s Mode read from CR0 at guest %s linear rip 0x%x\n",
446 info->cpu_mode==PROTECTED_PG ? "Paged" : "",
447 info->cpu_mode==PROTECTED_PG ? "virtual" : "",
448 get_addr_linear(info,info->rip,&(info->segments.cs)));
450 // We need to read the instruction, which is at CS:IP, but that
451 // linear address is guest physical without PG and guest virtual with PG
452 if (info->cpu_mode==PROTECTED) {
453 // The real rip address is actually a combination of the rip + CS base
454 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
455 } else { // PROTECTED_PG
456 // The real rip address is actually a combination of the rip + CS base
457 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
461 // I think we should inject a GPF into the guest
462 PrintDebug("Could not read Protected %s mode instruction (ret=%d)\n",
463 info->cpu_mode==PROTECTED_PG ? "Paged" : "", ret);
467 while (is_prefix_byte(instr[index])) {
472 if ((instr[index] == cr_access_byte) &&
473 (instr[index+1] == mov_from_cr_byte)) {
475 // MOV from CR0 to register
477 addr_t first_operand;
478 addr_t second_operand;
479 operand_type_t addr_type;
480 struct cr0_32 * virt_cr0;
481 struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
485 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
487 if (addr_type != REG_OPERAND) {
488 PrintDebug("Invalid operand type in mov from CR0\n");
492 virt_cr0 = (struct cr0_32 *)first_operand;
494 if (info->page_mode == SHADOW_PAGING) {
495 *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
497 *virt_cr0 = *real_cr0;
503 PrintDebug("Unknown read instruction from CR0\n");
510 PrintDebug("Protected PAE Mode read to CR0 is UNIMPLEMENTED\n");
513 case PROTECTED_PAE_PG:
514 PrintDebug("Protected PAE Paged Mode read to CR0 is UNIMPLEMENTED\n");
518 PrintDebug("Protected Long Mode read to CR0 is UNIMPLEMENTED\n");
522 PrintDebug("Protected Long Paged Mode read to CR0 is UNIMPLEMENTED\n");
526 PrintDebug("Unknown Mode read from CR0 (info->cpu_mode=0x%x)\n",info->cpu_mode);
539 int handle_cr3_write(struct guest_info * info) {
540 if ((info->cpu_mode == PROTECTED) || (info->cpu_mode == PROTECTED_PG)) {
546 /* Isn't the RIP a Guest Virtual Address???????? */
547 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
549 PrintDebug("Could not read instruction (ret=%d)\n", ret);
553 while (is_prefix_byte(instr[index])) {
557 if ((instr[index] == cr_access_byte) &&
558 (instr[index + 1] == mov_to_cr_byte)) {
560 addr_t first_operand;
561 addr_t second_operand;
562 struct cr3_32 * new_cr3;
563 // struct cr3_32 * real_cr3;
564 operand_type_t addr_type;
568 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
570 if (addr_type != REG_OPERAND) {
571 /* Mov to CR3 can only be a 32 bit register */
575 new_cr3 = (struct cr3_32 *)first_operand;
577 if (info->page_mode == SHADOW_PAGING) {
579 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
580 struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
582 PrintDebug("fooo1\n");
584 /* Delete the current Page Tables */
585 delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3));
587 PrintDebug("fooo2\n");
588 *guest_cr3 = *new_cr3;
590 // Something like this
591 shadow_pt = create_new_shadow_pt32(info);
592 //shadow_pt = setup_shadow_pt32(info, CR3_TO_PDE32(*(addr_t *)new_cr3));
595 /* Copy Various flags */
596 *shadow_cr3 = *new_cr3;
598 shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt);
600 if (info->cpu_mode == PROTECTED_PG) {
601 // If we aren't in paged mode then we have to preserve the identity mapped CR3
602 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
609 PrintDebug("Unknown Instruction\n");
613 PrintDebug("Invalid operating Mode\n");
623 int handle_cr3_read(struct guest_info * info) {
624 if ((info->cpu_mode == PROTECTED) || (info->cpu_mode == PROTECTED_PG)) {
629 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
631 PrintDebug("Could not read instruction (ret=%d)\n", ret);
635 while (is_prefix_byte(instr[index])) {
639 if ((instr[index] == cr_access_byte) &&
640 (instr[index + 1] == mov_from_cr_byte)) {
641 addr_t first_operand;
642 addr_t second_operand;
643 struct cr3_32 * virt_cr3;
644 struct cr3_32 * real_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
645 operand_type_t addr_type;
649 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
651 if (addr_type != REG_OPERAND) {
652 /* Mov to CR3 can only be a 32 bit register */
656 virt_cr3 = (struct cr3_32 *)first_operand;
658 if (info->page_mode == SHADOW_PAGING) {
659 *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
661 *virt_cr3 = *real_cr3;
666 PrintDebug("Unknown Instruction\n");
670 PrintDebug("Invalid operating Mode\n");