X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_ctrl_regs.c;h=ba83f3b6010c448e05ab963edd4dbc31cc5d27b3;hb=07820ee58e9b356341ce86cd2b2938d3abef60c9;hp=245ba44d55f9c90b843af78ed136c2e150a77f93;hpb=3c36ed92e446eabd03d2ab533eece3d227601e8c;p=palacios.git diff --git a/palacios/src/palacios/vmm_ctrl_regs.c b/palacios/src/palacios/vmm_ctrl_regs.c index 245ba44..ba83f3b 100644 --- a/palacios/src/palacios/vmm_ctrl_regs.c +++ b/palacios/src/palacios/vmm_ctrl_regs.c @@ -7,8 +7,6 @@ -extern void SerialMemDump(unsigned char *start, int n); - /* Segmentation is a problem here... * * When we get a memory operand, presumably we use the default segment (which is?) @@ -16,311 +14,120 @@ extern void SerialMemDump(unsigned char *start, int n); */ -int handle_cr0_write(struct guest_info * info) { - char instr[15]; - - - switch (info->cpu_mode) { - case REAL: - { - int index = 0; - int ret; - - PrintDebug("Real Mode write to CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); +#ifndef DEBUG_CTRL_REGS +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif - // The real rip address is actually a combination of the rip + CS base - ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - if (ret != 15) { - // I think we should inject a GPF into the guest - PrintDebug("Could not read instruction (ret=%d)\n", ret); - return -1; - } - while (is_prefix_byte(instr[index])) { - index++; - } - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == lmsw_byte) && - (MODRM_REG(instr[index + 2]) == lmsw_reg_byte)) { - - addr_t first_operand; - addr_t second_operand; - struct cr0_real *real_cr0; - struct cr0_real *new_cr0; - operand_type_t addr_type; - char new_cr0_val = 0; - // LMSW - // decode mod/RM - index += 2; - - real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); - - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16); - if (addr_type == REG_OPERAND) { - new_cr0 = (struct cr0_real *)first_operand; - } else if (addr_type == MEM_OPERAND) { - addr_t host_addr; - if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) { - // gpf the guest - return -1; - } - - new_cr0 = (struct cr0_real *)host_addr; - } else { - PrintDebug("Memory operand in real mode write to CR0 is UNIMPLEMENTED\n"); - // error... don't know what to do - return -1; - } - - if ((new_cr0->pe == 1) && (real_cr0->pe == 0)) { - info->cpu_mode = PROTECTED; - } else if ((new_cr0->pe == 0) && (real_cr0->pe == 1)) { - info->cpu_mode = REAL; - } - - new_cr0_val = *(char*)(new_cr0) & 0x0f; +int handle_cr0_write(struct guest_info * info) { + char instr[15]; + int ret; + struct x86_instr dec_instr; - if (info->page_mode == SHADOW_PAGING) { - struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); + if (info->mem_mode == PHYSICAL_MEM) { + ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } else { + ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } - PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - /* struct cr0_real is only 4 bits wide, - * so we can overwrite the real_cr0 without worrying about the shadow fields - */ - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; - - *(char*)shadow_cr0 &= 0xf0; - *(char*)shadow_cr0 |= new_cr0_val; + if (ret != 15) { + // I think we should inject a GPF into the guest + PrintError("Could not read instruction (ret=%d)\n", ret); + return -1; + } - PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - } else { - PrintDebug("Old CR0=%x\n", *real_cr0); - // for now we just pass through.... - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; + if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) { + PrintError("Could not decode instruction\n"); + return -1; + } - PrintDebug("New CR0=%x\n", *real_cr0); - } + if (opcode_cmp(V3_OPCODE_LMSW, (const uchar_t *)(dec_instr.opcode)) == 0) { + struct cr0_real *real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); + struct cr0_real *new_cr0 = (struct cr0_real *)(dec_instr.first_operand.operand); + uchar_t new_cr0_val; - info->rip += index; + PrintDebug("LMSW\n"); - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] == clts_byte)) { - // CLTS - PrintDebug("CLTS unhandled in CR0 write\n"); - return -1; + new_cr0_val = (*(char*)(new_cr0)) & 0x0f; + + PrintDebug("OperandVal = %x\n", new_cr0_val); - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] = mov_to_cr_byte)) { - addr_t first_operand; - addr_t second_operand; - struct cr0_32 *real_cr0; - struct cr0_32 *new_cr0; - operand_type_t addr_type; - + PrintDebug("Old CR0=%x\n", *real_cr0); + *(uchar_t*)real_cr0 &= 0xf0; + *(uchar_t*)real_cr0 |= new_cr0_val; + PrintDebug("New CR0=%x\n", *real_cr0); - index += 2; - - real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type != REG_OPERAND) { - PrintDebug("Moving to CR0 from non-register operand in CR0 write\n"); - /* Mov to CR0 Can only be a 32 bit register */ - // FIX ME - return -1; - } + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); + + PrintDebug(" Old Shadow CR0=%x\n", *shadow_cr0); + *(uchar_t*)shadow_cr0 &= 0xf0; + *(uchar_t*)shadow_cr0 |= new_cr0_val; + PrintDebug("New Shadow CR0=%x\n", *shadow_cr0); + } + } else if (opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) { + PrintDebug("MOV2CR0\n"); - new_cr0 = (struct cr0_32 *)first_operand; + if (info->cpu_mode == LONG) { + // 64 bit registers + } else { + // 32 bit registers + struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); + struct cr0_32 *new_cr0= (struct cr0_32 *)(dec_instr.second_operand.operand); - if (new_cr0->pe == 1) { - PrintDebug("Entering Protected Mode\n"); - info->cpu_mode = PROTECTED; - } + PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.first_operand.size); - if (new_cr0->pg == 1) { - PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n"); - // GPF the guest?? - return -1; - } - - if (info->page_mode == SHADOW_PAGING) { - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + PrintDebug("Old CR0=%x\n", *real_cr0); + *real_cr0 = *new_cr0; - PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - *real_cr0 = *new_cr0; - real_cr0->pg = 1; - - *shadow_cr0 = *new_cr0; - - PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - } else { - PrintDebug("Old CR0=%x\n", *real_cr0); - *real_cr0 = *new_cr0; - PrintDebug("New CR0=%x\n", *real_cr0); - } - - info->rip += index; - - } else { - PrintDebug("Unsupported Instruction\n"); - // unsupported instruction, UD the guest - return -1; - } - } - break; - - case PROTECTED: - case PROTECTED_PG: - { - - int index = 0; - int ret; - - PrintDebug("Protected %s Mode write to CR0 at guest %s linear rip 0x%x\n", - info->cpu_mode==PROTECTED_PG ? "Paged" : "", - info->cpu_mode==PROTECTED_PG ? "virtual" : "", - get_addr_linear(info,info->rip,&(info->segments.cs))); - - // OK, now we will read the instruction - // The only difference between PROTECTED and PROTECTED_PG is whether we read - // from guest_pa or guest_va - if (info->cpu_mode==PROTECTED) { - // The real rip address is actually a combination of the rip + CS base - ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - } else { //PROTECTED_PG - ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - } - - if (ret != 15) { - // I think we should inject a GPF into the guest - PrintDebug("Could not read instruction (ret=%d)\n", ret); - return -1; - } - - while (is_prefix_byte(instr[index])) { - index++; - } - - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - - struct cr0_32 * real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == mov_to_cr_byte)) { - - // MOV to CR0 - - addr_t first_operand; - addr_t second_operand; - struct cr0_32 *new_cr0; - operand_type_t addr_type; - - index += 2; - - - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type != REG_OPERAND) { - PrintDebug("Non-register operand in write to CR0\n"); - return -1; - } - - new_cr0 = (struct cr0_32 *)first_operand; - - - - if (info->page_mode == SHADOW_PAGING) { - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - - if (new_cr0->pg == 1){ - // This should be new_cr0->pg && !(old_cr->pg), right? - // and then a case for turning paging off? - - struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); - - info->cpu_mode = PROTECTED_PG; + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - *shadow_cr0 = *new_cr0; - *real_cr0 = *new_cr0; - - // - // Activate Shadow Paging - // - PrintDebug("Turning on paging in the guest\n"); - - info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; + PrintDebug("Old Shadow CR0=%x\n", *shadow_cr0); - - } else if (new_cr0->pe == 0) { - info->cpu_mode = REAL; - - *shadow_cr0 = *new_cr0; - *real_cr0 = *new_cr0; + real_cr0->et = 1; + + *shadow_cr0 = *new_cr0; + shadow_cr0->et = 1; + + if (get_mem_mode(info) == VIRTUAL_MEM) { + struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); + + info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; + } else { + info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt); real_cr0->pg = 1; } - - - } else { - *real_cr0 = *new_cr0; - } - - info->rip += index; - - } else if ((instr[index] == 0x0f) && - (instr[index + 1] == 0x06)) { - // CLTS instruction - PrintDebug("CLTS instruction - clearing TS flag of real and shadow CR0\n"); - shadow_cr0->ts=0; - real_cr0->ts=0; - - index+=2; - - info->rip+=index; - - } else { - PrintDebug("Unkown instruction: \n"); - SerialMemDump(instr,15); - return -1; - } + + PrintDebug("New Shadow CR0=%x\n",*shadow_cr0); + } + PrintDebug("New CR0=%x\n", *real_cr0); } - break; - - case PROTECTED_PAE: - PrintDebug("Protected PAE Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; - - case PROTECTED_PAE_PG: - PrintDebug("Protected PAE Paged Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; - - case LONG: - PrintDebug("Protected Long Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; - case LONG_PG: - PrintDebug("Protected Long Paged Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; + } else if (opcode_cmp(V3_OPCODE_CLTS, (const uchar_t *)(dec_instr.opcode)) == 0) { + // CLTS + struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); + + real_cr0->ts = 0; - default: - { - PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode); - return -1; + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + shadow_cr0->ts = 0; } - break; - } + info->rip += dec_instr.instr_length; + return 0; } @@ -337,6 +144,7 @@ int handle_cr0_read(struct guest_info * info) { int ret; PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); + //PrintV3Segments(info); // The real rip address is actually a combination of the rip + CS base ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); @@ -348,9 +156,28 @@ int handle_cr0_read(struct guest_info * info) { while (is_prefix_byte(instr[index])) { + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } index++; } + /* + while (is_prefix_byte(instr[index])) { + index++; + } + */ + if ((instr[index] == cr_access_byte) && (instr[index + 1] == smsw_byte) && (MODRM_REG(instr[index + 2]) == smsw_reg_byte)) { @@ -418,12 +245,14 @@ int handle_cr0_read(struct guest_info * info) { return -1; } - if (info->page_mode == SHADOW_PAGING) { + if (info->shdw_pg_mode == SHADOW_PAGING) { *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); } else { *virt_cr0 = *real_cr0; } + PrintDebug("Returning CR0: %x\n", *virt_cr0); + info->rip += index; } else { @@ -436,39 +265,64 @@ int handle_cr0_read(struct guest_info * info) { break; case PROTECTED: - case PROTECTED_PG: { int index = 0; int ret; PrintDebug("Protected %s Mode read from CR0 at guest %s linear rip 0x%x\n", - info->cpu_mode==PROTECTED_PG ? "Paged" : "", - info->cpu_mode==PROTECTED_PG ? "virtual" : "", - get_addr_linear(info,info->rip,&(info->segments.cs))); + info->mem_mode == VIRTUAL_MEM ? "Paged" : "", + info->mem_mode == VIRTUAL_MEM ? "virtual" : "", + get_addr_linear(info, info->rip, &(info->segments.cs))); // We need to read the instruction, which is at CS:IP, but that // linear address is guest physical without PG and guest virtual with PG - if (info->cpu_mode==PROTECTED) { + if (info->cpu_mode == PHYSICAL_MEM) { // The real rip address is actually a combination of the rip + CS base ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - } else { // PROTECTED_PG + } else { // The real rip address is actually a combination of the rip + CS base ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); } + + /* + PrintDebug("Instr (15 bytes) at %x:\n", instr); + PrintTraceMemDump((char*)instr, 15); + */ + if (ret != 15) { // I think we should inject a GPF into the guest PrintDebug("Could not read Protected %s mode instruction (ret=%d)\n", - info->cpu_mode==PROTECTED_PG ? "Paged" : "", ret); + info->cpu_mode == VIRTUAL_MEM ? "Paged" : "", ret); return -1; } + while (is_prefix_byte(instr[index])) { + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } index++; } + /* + while (is_prefix_byte(instr[index])) { + index++; + } + */ + if ((instr[index] == cr_access_byte) && (instr[index+1] == mov_from_cr_byte)) { @@ -491,11 +345,19 @@ int handle_cr0_read(struct guest_info * info) { virt_cr0 = (struct cr0_32 *)first_operand; - if (info->page_mode == SHADOW_PAGING) { + if (info->shdw_pg_mode == SHADOW_PAGING) { *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + + if (info->mem_mode == PHYSICAL_MEM) { + virt_cr0->pg = 0; // clear the pg bit because guest doesn't think it's on + } + } else { *virt_cr0 = *real_cr0; } + + PrintDebug("real CR0: %x\n", *(uint_t*)real_cr0); + PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0); info->rip += index; @@ -510,17 +372,11 @@ int handle_cr0_read(struct guest_info * info) { PrintDebug("Protected PAE Mode read to CR0 is UNIMPLEMENTED\n"); return -1; - case PROTECTED_PAE_PG: - PrintDebug("Protected PAE Paged Mode read to CR0 is UNIMPLEMENTED\n"); - return -1; - case LONG: PrintDebug("Protected Long Mode read to CR0 is UNIMPLEMENTED\n"); return -1; - case LONG_PG: - PrintDebug("Protected Long Paged Mode read to CR0 is UNIMPLEMENTED\n"); - return -1; + default: { PrintDebug("Unknown Mode read from CR0 (info->cpu_mode=0x%x)\n",info->cpu_mode); @@ -537,22 +393,172 @@ int handle_cr0_read(struct guest_info * info) { int handle_cr3_write(struct guest_info * info) { - if ((info->cpu_mode == PROTECTED) || (info->cpu_mode == PROTECTED_PG)) { + if (info->cpu_mode == REAL) { + // WHAT THE HELL DOES THIS EVEN MEAN????? + int index = 0; int ret; char instr[15]; + PrintDebug("Real Mode Write to CR3.\n"); + // We need to read the instruction, which is at CS:IP, but that + // linear address is guest physical without PG and guest virtual with PG - /* Isn't the RIP a Guest Virtual Address???????? */ ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + if (ret != 15) { PrintDebug("Could not read instruction (ret=%d)\n", ret); return -1; } + + while (is_prefix_byte(instr[index])) { + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } + index++; + } + + if ((instr[index] == cr_access_byte) && + (instr[index + 1] == mov_to_cr_byte)) { + + addr_t first_operand; + addr_t second_operand; + struct cr3_32 * new_cr3; + // struct cr3_32 * real_cr3; + operand_type_t addr_type; + + index += 2; + + addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + + if (addr_type != REG_OPERAND) { + /* Mov to CR3 can only be a 32 bit register */ + return -1; + } + + new_cr3 = (struct cr3_32 *)first_operand; + + if (info->shdw_pg_mode == SHADOW_PAGING) { + addr_t shadow_pt; + struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); + struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3); + + /* + + if (CR3_TO_PDE32(*(uint_t*)shadow_cr3) != 0) { + PrintDebug("Shadow Page Table\n"); + PrintDebugPageTables((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3)); + } + */ + + /* Delete the current Page Tables */ + delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3)); + + PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n", + *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3); + + + *guest_cr3 = *new_cr3; + + + + // Something like this + shadow_pt = create_new_shadow_pt32(info); + //shadow_pt = setup_shadow_pt32(info, CR3_TO_PDE32(*(addr_t *)new_cr3)); + + /* Copy Various flags */ + *shadow_cr3 = *new_cr3; + + /* + { + addr_t tmp_addr; + guest_pa_to_host_va(info, ((*(uint_t*)guest_cr3) & 0xfffff000), &tmp_addr); + PrintDebug("Guest PD\n"); + PrintPD32((pde32_t *)tmp_addr); + + } + */ + + + shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt); + + PrintDebug("New Shadow CR3=%x; New Guest CR3=%x\n", + *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3); + + + + + } + info->rip += index; + + } else { + PrintDebug("Unknown Instruction\n"); + PrintTraceMemDump(instr,15); + return -1; + } + + + + } else if (info->cpu_mode == PROTECTED) { + int index = 0; + int ret; + char instr[15]; + + PrintDebug("Protected %s mode write to CR3 at %s 0x%x\n", + info->cpu_mode==PROTECTED ? "" : "Paged", + info->cpu_mode==PROTECTED ? "guest physical" : "guest virtual", + get_addr_linear(info,info->rip,&(info->segments.cs))); + + // We need to read the instruction, which is at CS:IP, but that + // linear address is guest physical without PG and guest virtual with PG + if (info->mem_mode == PHYSICAL_MEM) { + // The real rip address is actually a combination of the rip + CS base + //PrintDebug("Writing Guest CR3 Write (Physical Address)\n"); + ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } else { + //PrintDebug("Writing Guest CR3 Write (Virtual Address)\n"); + // The real rip address is actually a combination of the rip + CS base + ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } + + if (ret != 15) { + PrintDebug("Could not read instruction (ret=%d)\n", ret); + return -1; + } + while (is_prefix_byte(instr[index])) { - index++; + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } + index++; } + + /* + while (is_prefix_byte(instr[index])) { + index++; + } + */ if ((instr[index] == cr_access_byte) && (instr[index + 1] == mov_to_cr_byte)) { @@ -574,30 +580,56 @@ int handle_cr3_write(struct guest_info * info) { new_cr3 = (struct cr3_32 *)first_operand; - if (info->page_mode == SHADOW_PAGING) { + if (info->shdw_pg_mode == SHADOW_PAGING) { addr_t shadow_pt; struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3); - PrintDebug("fooo1\n"); + + /* + if (CR3_TO_PDE32(*(uint_t*)shadow_cr3) != 0) { + PrintDebug("Shadow Page Table\n"); + PrintDebugPageTables((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3)); + } + */ /* Delete the current Page Tables */ delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3)); - PrintDebug("fooo2\n"); + PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n", + *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3); + + *guest_cr3 = *new_cr3; + + // Something like this shadow_pt = create_new_shadow_pt32(info); //shadow_pt = setup_shadow_pt32(info, CR3_TO_PDE32(*(addr_t *)new_cr3)); - /* Copy Various flags */ *shadow_cr3 = *new_cr3; + + /* + { + addr_t tmp_addr; + guest_pa_to_host_va(info, ((*(uint_t*)guest_cr3) & 0xfffff000), &tmp_addr); + PrintDebug("Guest PD\n"); + PrintPD32((pde32_t *)tmp_addr); + + } + */ + shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt); - if (info->cpu_mode == PROTECTED_PG) { + PrintDebug("New Shadow CR3=%x; New Guest CR3=%x\n", + *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3); + + + + if (info->mem_mode == VIRTUAL_MEM) { // If we aren't in paged mode then we have to preserve the identity mapped CR3 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; } @@ -607,10 +639,11 @@ int handle_cr3_write(struct guest_info * info) { } else { PrintDebug("Unknown Instruction\n"); + PrintTraceMemDump(instr,15); return -1; } } else { - PrintDebug("Invalid operating Mode\n"); + PrintDebug("Invalid operating Mode (0x%x)\n", info->cpu_mode); return -1; } @@ -621,21 +654,123 @@ int handle_cr3_write(struct guest_info * info) { int handle_cr3_read(struct guest_info * info) { - if ((info->cpu_mode == PROTECTED) || (info->cpu_mode == PROTECTED_PG)) { + + if (info->cpu_mode == REAL) { + char instr[15]; + int ret; + int index = 0; + addr_t linear_addr = 0; + + linear_addr = get_addr_linear(info, info->rip, &(info->segments.cs)); + + + //PrintDebug("RIP Linear: %x\n", linear_addr); + //PrintV3Segments(info); + + ret = read_guest_pa_memory(info, linear_addr, 15, instr); + + if (ret != 15) { + PrintDebug("Could not read instruction (ret=%d)\n", ret); + return -1; + } + + while (is_prefix_byte(instr[index])) { + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } + index++; + } + + + if ((instr[index] == cr_access_byte) && + (instr[index + 1] == mov_from_cr_byte)) { + addr_t first_operand; + addr_t second_operand; + struct cr3_32 * virt_cr3; + struct cr3_32 * real_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3); + operand_type_t addr_type; + + index += 2; + + addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + + if (addr_type != REG_OPERAND) { + /* Mov to CR3 can only be a 32 bit register */ + return -1; + } + + virt_cr3 = (struct cr3_32 *)first_operand; + + if (info->shdw_pg_mode == SHADOW_PAGING) { + *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3); + } else { + *virt_cr3 = *real_cr3; + } + + info->rip += index; + } else { + PrintDebug("Unknown Instruction\n"); + PrintTraceMemDump(instr,15); + return -1; + } + + + return 0; + } else if (info->cpu_mode == PROTECTED) { + int index = 0; int ret; char instr[15]; - ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + + // We need to read the instruction, which is at CS:IP, but that + // linear address is guest physical without PG and guest virtual with PG + if (info->cpu_mode == PHYSICAL_MEM) { + // The real rip address is actually a combination of the rip + CS base + ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } else { + // The real rip address is actually a combination of the rip + CS base + ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } + if (ret != 15) { PrintDebug("Could not read instruction (ret=%d)\n", ret); return -1; } while (is_prefix_byte(instr[index])) { - index++; + switch(instr[index]) { + case PREFIX_CS_OVERRIDE: + case PREFIX_SS_OVERRIDE: + case PREFIX_DS_OVERRIDE: + case PREFIX_ES_OVERRIDE: + case PREFIX_FS_OVERRIDE: + case PREFIX_GS_OVERRIDE: + PrintDebug("Segment Override!!\n"); + return -1; + break; + default: + break; + } + index++; } + /* + while (is_prefix_byte(instr[index])) { + index++; + } + */ + if ((instr[index] == cr_access_byte) && (instr[index + 1] == mov_from_cr_byte)) { addr_t first_operand; @@ -655,7 +790,7 @@ int handle_cr3_read(struct guest_info * info) { virt_cr3 = (struct cr3_32 *)first_operand; - if (info->page_mode == SHADOW_PAGING) { + if (info->shdw_pg_mode == SHADOW_PAGING) { *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3); } else { *virt_cr3 = *real_cr3; @@ -664,10 +799,12 @@ int handle_cr3_read(struct guest_info * info) { info->rip += index; } else { PrintDebug("Unknown Instruction\n"); + PrintTraceMemDump(instr,15); return -1; } } else { - PrintDebug("Invalid operating Mode\n"); + PrintDebug("Invalid operating Mode (0x%x), control registers follow\n", info->cpu_mode); + PrintV3CtrlRegs(info); return -1; }