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 /* Segmentation is a problem here...
12 * When we get a memory operand, presumably we use the default segment (which is?)
13 * unless an alternate segment was specfied in the prefix...
17 #ifndef DEBUG_CTRL_REGS
19 #define PrintDebug(fmt, args...)
28 // First Attempt = 494 lines
29 // current = 106 lines
30 int handle_cr0_write(struct guest_info * info) {
33 struct x86_instr dec_instr;
35 if (info->mem_mode == PHYSICAL_MEM) {
36 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
38 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
42 // I think we should inject a GPF into the guest
43 PrintError("Could not read instruction (ret=%d)\n", ret);
47 if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
48 PrintError("Could not decode instruction\n");
53 if (opcode_cmp(V3_OPCODE_LMSW, (const uchar_t *)(dec_instr.opcode)) == 0) {
54 struct cr0_real *real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0);
55 struct cr0_real *new_cr0 = (struct cr0_real *)(dec_instr.src_operand.operand);
60 new_cr0_val = (*(char*)(new_cr0)) & 0x0f;
62 PrintDebug("OperandVal = %x\n", new_cr0_val);
64 PrintDebug("Old CR0=%x\n", *real_cr0);
65 *(uchar_t*)real_cr0 &= 0xf0;
66 *(uchar_t*)real_cr0 |= new_cr0_val;
67 PrintDebug("New CR0=%x\n", *real_cr0);
70 if (info->shdw_pg_mode == SHADOW_PAGING) {
71 struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0);
73 PrintDebug(" Old Shadow CR0=%x\n", *shadow_cr0);
74 *(uchar_t*)shadow_cr0 &= 0xf0;
75 *(uchar_t*)shadow_cr0 |= new_cr0_val;
76 PrintDebug("New Shadow CR0=%x\n", *shadow_cr0);
78 } else if (opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) {
79 PrintDebug("MOV2CR0\n");
81 if (info->cpu_mode == LONG) {
85 struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
86 struct cr0_32 *new_cr0= (struct cr0_32 *)(dec_instr.src_operand.operand);
88 PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.dst_operand.size);
91 PrintDebug("Old CR0=%x\n", *real_cr0);
95 if (info->shdw_pg_mode == SHADOW_PAGING) {
96 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
98 PrintDebug("Old Shadow CR0=%x\n", *shadow_cr0);
102 *shadow_cr0 = *new_cr0;
105 if (get_mem_mode(info) == VIRTUAL_MEM) {
106 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
108 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
110 info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt);
114 PrintDebug("New Shadow CR0=%x\n",*shadow_cr0);
116 PrintDebug("New CR0=%x\n", *real_cr0);
119 } else if (opcode_cmp(V3_OPCODE_CLTS, (const uchar_t *)(dec_instr.opcode)) == 0) {
121 struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
125 if (info->shdw_pg_mode == SHADOW_PAGING) {
126 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
130 PrintError("Unhandled opcode in handle_cr0_write\n");
134 info->rip += dec_instr.instr_length;
140 // First attempt = 253 lines
141 // current = 51 lines
142 int handle_cr0_read(struct guest_info * info) {
145 struct x86_instr dec_instr;
147 if (info->mem_mode == PHYSICAL_MEM) {
148 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
150 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
154 // I think we should inject a GPF into the guest
155 PrintError("Could not read instruction (ret=%d)\n", ret);
159 if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
160 PrintError("Could not decode instruction\n");
164 if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) {
165 struct cr0_32 * virt_cr0 = (struct cr0_32 *)(dec_instr.dst_operand.operand);
166 struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
168 PrintDebug("MOVCR2\n");
169 PrintDebug("CR0 at 0x%x\n", real_cr0);
171 if (info->shdw_pg_mode == SHADOW_PAGING) {
172 *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
174 *virt_cr0 = *real_cr0;
177 PrintDebug("real CR0: %x\n", *(uint_t*)real_cr0);
178 PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0);
179 } else if (opcode_cmp(V3_OPCODE_SMSW, (const uchar_t *)(dec_instr.opcode)) == 0) {
180 struct cr0_real *real_cr0= (struct cr0_real*)&(info->ctrl_regs.cr0);
181 struct cr0_real *virt_cr0 = (struct cr0_real *)(dec_instr.dst_operand.operand);
182 char cr0_val = *(char*)real_cr0 & 0x0f;
184 PrintDebug("SMSW\n");
186 PrintDebug("CR0 at 0x%x\n", real_cr0);
188 *(char *)virt_cr0 &= 0xf0;
189 *(char *)virt_cr0 |= cr0_val;
192 PrintError("Unhandled opcode in handle_cr0_read\n");
196 info->rip += dec_instr.instr_length;
203 // First Attemp = 256 lines
204 // current = 65 lines
205 int handle_cr3_write(struct guest_info * info) {
208 struct x86_instr dec_instr;
210 if (info->mem_mode == PHYSICAL_MEM) {
211 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
213 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
217 // I think we should inject a GPF into the guest
218 PrintError("Could not read instruction (ret=%d)\n", ret);
222 if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
223 PrintError("Could not decode instruction\n");
227 if (opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) {
229 PrintDebug("MOV2CR3\n");
231 PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3));
233 if (info->shdw_pg_mode == SHADOW_PAGING) {
234 struct cr3_32 * new_cr3 = (struct cr3_32 *)(dec_instr.src_operand.operand);
235 struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
236 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
238 PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n",
239 *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
241 if (1 || !CR3_32_SAME_BASE(new_cr3, guest_cr3)) {
245 PrintDebug("New CR3 is different - flushing shadow page table\n");
247 delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3));
249 shadow_pt = create_new_shadow_pt32(info);
251 shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt);
254 shadow_cr3->pwt = new_cr3->pwt;
255 shadow_cr3->pcd = new_cr3->pcd;
258 *guest_cr3 = *new_cr3;
260 PrintDebug("New Shadow CR3=%x; New Guest CR3=%x\n",
261 *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
263 if (info->mem_mode == VIRTUAL_MEM) {
264 // If we aren't in paged mode then we have to preserve the identity mapped CR3
265 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
269 PrintError("Unhandled opcode in handle_cr3_write\n");
273 info->rip += dec_instr.instr_length;
280 // first attempt = 156 lines
281 // current = 36 lines
282 int handle_cr3_read(struct guest_info * info) {
285 struct x86_instr dec_instr;
287 if (info->mem_mode == PHYSICAL_MEM) {
288 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
290 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
294 // I think we should inject a GPF into the guest
295 PrintError("Could not read instruction (ret=%d)\n", ret);
299 if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
300 PrintError("Could not decode instruction\n");
304 if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) {
305 PrintDebug("MOVCR32\n");
306 struct cr3_32 * virt_cr3 = (struct cr3_32 *)(dec_instr.dst_operand.operand);
308 PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3));
310 if (info->shdw_pg_mode == SHADOW_PAGING) {
311 *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
313 *virt_cr3 = *(struct cr3_32 *)&(info->ctrl_regs.cr3);
316 PrintError("Unhandled opcode in handle_cr3_read\n");
321 info->rip += dec_instr.instr_length;