X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_ctrl_regs.c;h=5bf6dc1b1f09b074020b403d4e7e178554f25b3c;hb=f9bb3db89469169bb5775dc031d89e570c6fed70;hp=4dba7372f4d6c8584ef318bfa20a9b97917e676e;hpb=b07ca7a7edd31d34a8dc613e3d208bbeedd44661;p=palacios.git diff --git a/palacios/src/palacios/vmm_ctrl_regs.c b/palacios/src/palacios/vmm_ctrl_regs.c index 4dba737..5bf6dc1 100644 --- a/palacios/src/palacios/vmm_ctrl_regs.c +++ b/palacios/src/palacios/vmm_ctrl_regs.c @@ -1,3 +1,6 @@ +/* Northwestern University */ +/* (c) 2008, Jack Lange */ + #include #include #include @@ -7,8 +10,6 @@ -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?) @@ -16,675 +17,322 @@ 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))); - - // 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; - } +#ifndef DEBUG_CTRL_REGS +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif - 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; +// First Attempt = 494 lines +// current = 106 lines +int handle_cr0_write(struct guest_info * info) { + char instr[15]; + int ret; + struct x86_instr dec_instr; - if (info->shdw_pg_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; + /* The IFetch will already have faulted in the necessary bytes for the full instruction + 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.src_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; - } - - new_cr0 = (struct cr0_32 *)first_operand; + 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"); - if (new_cr0->pe == 1) { - PrintDebug("Entering Protected Mode\n"); - info->cpu_mode = PROTECTED; - } + 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.src_operand.operand); - if (new_cr0->pg == 1) { - PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n"); + PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.src_operand.size); - // GPF the guest?? - return -1; - } - if (info->shdw_pg_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: - { - - int index = 0; - int ret; - - PrintDebug("Protected %s Mode write to CR0 at guest %s linear rip 0x%x\n", - info->mem_mode == VIRTUAL_MEM ? "Paged" : "", - info->mem_mode == VIRTUAL_MEM ? "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->mem_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 { - 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->shdw_pg_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->mem_mode = VIRTUAL_MEM; + 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; } + + PrintDebug("New Shadow CR0=%x\n",*shadow_cr0); + } + PrintDebug("New CR0=%x\n", *real_cr0); + } - - } 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; + } 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); - info->rip+=index; + real_cr0->ts = 0; - } else { - PrintDebug("Unkown instruction: \n"); - SerialMemDump(instr,15); - 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; - - case PROTECTED_PAE: - PrintDebug("Protected PAE Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; - - case LONG: - PrintDebug("Protected Long Mode write to CR0 is UNIMPLEMENTED\n"); + } else { + PrintError("Unhandled opcode in handle_cr0_write\n"); return -1; - - default: - { - PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode); - return -1; - } - break; - } + info->rip += dec_instr.instr_length; + return 0; } +// First attempt = 253 lines +// current = 51 lines int handle_cr0_read(struct guest_info * info) { char instr[15]; + int ret; + struct x86_instr dec_instr; - switch (info->cpu_mode) { - - case REAL: - { - - int index = 0; - int ret; - - PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); - - // 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 Real Mode instruction (ret=%d)\n", ret); - return -1; - } - - - 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)) { - - // SMSW (store machine status word) + 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); + } - addr_t first_operand; - addr_t second_operand; - struct cr0_real *cr0; - operand_type_t addr_type; - char cr0_val = 0; + /* The IFetch will already have faulted in the necessary bytes for the full instruction + if (ret != 15) { + // I think we should inject a GPF into the guest + PrintError("Could not read instruction (ret=%d)\n", ret); + return -1; + } + */ - index += 2; - - 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 == 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 - PrintDebug("Could not convert guest physical address to host virtual address\n"); - return -1; - } - - first_operand = host_addr; - } else { - // Register operand - // Should be ok?? - } - - cr0_val = *(char*)cr0 & 0x0f; - - *(char *)first_operand &= 0xf0; - *(char *)first_operand |= cr0_val; - - PrintDebug("index = %d, rip = %x\n", index, (ulong_t)(info->rip)); - info->rip += index; - PrintDebug("new_rip = %x\n", (ulong_t)(info->rip)); - // success - - } else if ((instr[index] == cr_access_byte) && - (instr[index+1] == mov_from_cr_byte)) { - /* Mov from CR0 - * This can only take a 32 bit register argument in anything less than 64 bit mode. - */ - addr_t first_operand; - addr_t second_operand; - operand_type_t addr_type; - - struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0); - - index += 2; - - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - struct cr0_32 * virt_cr0 = (struct cr0_32 *)first_operand; + if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) { + PrintError("Could not decode instruction\n"); + return -1; + } - if (addr_type != REG_OPERAND) { - // invalid opcode to guest - PrintDebug("Invalid operand type in mov from CR0\n"); - return -1; - } - - if (info->shdw_pg_mode == SHADOW_PAGING) { - *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - } else { - *virt_cr0 = *real_cr0; - } - - info->rip += index; - - } else { - PrintDebug("Unknown read instr from CR0\n"); - return -1; - } - - } - - break; - - case PROTECTED: - { + if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) { + struct cr0_32 * virt_cr0 = (struct cr0_32 *)(dec_instr.dst_operand.operand); + struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0); - int index = 0; - int ret; - - PrintDebug("Protected %s Mode read from CR0 at guest %s linear rip 0x%x\n", - 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 == 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) { - // I think we should inject a GPF into the guest - PrintDebug("Could not read Protected %s mode instruction (ret=%d)\n", - info->cpu_mode == VIRTUAL_MEM ? "Paged" : "", ret); - return -1; - } - - while (is_prefix_byte(instr[index])) { - index++; - } - - - if ((instr[index] == cr_access_byte) && - (instr[index+1] == mov_from_cr_byte)) { - - // MOV from CR0 to register - - addr_t first_operand; - addr_t second_operand; - operand_type_t addr_type; - struct cr0_32 * virt_cr0; - struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0); + PrintDebug("MOVCR2\n"); + PrintDebug("CR0 at 0x%x\n", real_cr0); - index += 2; - - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type != REG_OPERAND) { - PrintDebug("Invalid operand type in mov from CR0\n"); - return -1; - } - - virt_cr0 = (struct cr0_32 *)first_operand; - - if (info->shdw_pg_mode == SHADOW_PAGING) { - *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - } else { - *virt_cr0 = *real_cr0; - } - - info->rip += index; - - } else { - PrintDebug("Unknown read instruction from CR0\n"); - return -1; - } + if (info->shdw_pg_mode == SHADOW_PAGING) { + *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + } else { + *virt_cr0 = *real_cr0; } - break; + + PrintDebug("real CR0: %x\n", *(uint_t*)real_cr0); + PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0); + } else if (opcode_cmp(V3_OPCODE_SMSW, (const uchar_t *)(dec_instr.opcode)) == 0) { + struct cr0_real *real_cr0= (struct cr0_real*)&(info->ctrl_regs.cr0); + struct cr0_real *virt_cr0 = (struct cr0_real *)(dec_instr.dst_operand.operand); + char cr0_val = *(char*)real_cr0 & 0x0f; + + PrintDebug("SMSW\n"); - case PROTECTED_PAE: - PrintDebug("Protected PAE Mode read to CR0 is UNIMPLEMENTED\n"); - return -1; + PrintDebug("CR0 at 0x%x\n", real_cr0); - case LONG: - PrintDebug("Protected Long Mode read to CR0 is UNIMPLEMENTED\n"); + *(char *)virt_cr0 &= 0xf0; + *(char *)virt_cr0 |= cr0_val; + + } else { + PrintError("Unhandled opcode in handle_cr0_read\n"); return -1; - - - default: - { - PrintDebug("Unknown Mode read from CR0 (info->cpu_mode=0x%x)\n",info->cpu_mode); - return -1; - } - break; } + info->rip += dec_instr.instr_length; return 0; } - +// First Attempt = 256 lines +// current = 65 lines int handle_cr3_write(struct guest_info * info) { - if (info->cpu_mode == PROTECTED) { - int index = 0; - int ret; - char instr[15]; - - - // 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 - 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); - } - + int ret; + char instr[15]; + struct x86_instr dec_instr; - if (ret != 15) { - PrintDebug("Could not read instruction (ret=%d)\n", ret); - return -1; - } - - while (is_prefix_byte(instr[index])) { - index++; - } + 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); + } - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == mov_to_cr_byte)) { + /* The IFetch will already have faulted in the necessary bytes for the full instruction + if (ret != 15) { + // I think we should inject a GPF into the guest + PrintError("Could not read instruction (ret=%d)\n", ret); + return -1; + } + */ - addr_t first_operand; - addr_t second_operand; - struct cr3_32 * new_cr3; - // struct cr3_32 * real_cr3; - operand_type_t addr_type; + if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) { + PrintError("Could not decode instruction\n"); + return -1; + } - index += 2; + if (opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) { - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + PrintDebug("MOV2CR3\n"); - if (addr_type != REG_OPERAND) { - /* Mov to CR3 can only be a 32 bit register */ - return -1; - } + PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3)); - new_cr3 = (struct cr3_32 *)first_operand; + 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); + struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); + int cached = 0; + - 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("Old Shadow CR3=%x; Old Guest CR3=%x\n", + *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3); + + cached = cache_page_tables32(info, CR3_TO_PDE32(*(addr_t *)new_cr3)); - /* Delete the current Page Tables */ + if (cached == -1) { + PrintError("CR3 Cache failed\n"); + return -1; + } else if (cached == 0) { + addr_t shadow_pt; + + PrintDebug("New CR3 is different - flushing shadow page table\n"); + 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; - - - 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); - - - - 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; - } + shadow_pt = create_new_shadow_pt32(); + + shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt); + } else { + PrintDebug("Reusing cached shadow Page table\n"); } + + shadow_cr3->pwt = new_cr3->pwt; + shadow_cr3->pcd = new_cr3->pcd; + + // What the hell... + *guest_cr3 = *new_cr3; + + 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"); - return -1; + 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; + } } } else { - PrintDebug("Invalid operating Mode\n"); + PrintError("Unhandled opcode in handle_cr3_write\n"); return -1; } + info->rip += dec_instr.instr_length; + return 0; } - +// first attempt = 156 lines +// current = 36 lines int handle_cr3_read(struct guest_info * info) { - if (info->cpu_mode == PROTECTED) { - int index = 0; - int ret; - char instr[15]; - - - // 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++; - } + char instr[15]; + int ret; + struct x86_instr dec_instr; - 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; + 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); + } - index += 2; + /* The IFetch will already have faulted in the necessary bytes for the full instruction + if (ret != 15) { + // I think we should inject a GPF into the guest + PrintError("Could not read instruction (ret=%d)\n", ret); + return -1; + } + */ - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) { + PrintError("Could not decode instruction\n"); + return -1; + } - if (addr_type != REG_OPERAND) { - /* Mov to CR3 can only be a 32 bit register */ - return -1; - } + if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) { + PrintDebug("MOVCR32\n"); + struct cr3_32 * virt_cr3 = (struct cr3_32 *)(dec_instr.dst_operand.operand); - virt_cr3 = (struct cr3_32 *)first_operand; + PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3)); - 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; + if (info->shdw_pg_mode == SHADOW_PAGING) { + *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3); } else { - PrintDebug("Unknown Instruction\n"); - return -1; + *virt_cr3 = *(struct cr3_32 *)&(info->ctrl_regs.cr3); } } else { - PrintDebug("Invalid operating Mode\n"); + PrintError("Unhandled opcode in handle_cr3_read\n"); return -1; } + info->rip += dec_instr.instr_length; + return 0; }