X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_ctrl_regs.c;h=0322c073008c34e55e4adcb9c1210b639365f035;hb=bf091be03d4a623fa1a9b3151698a4564a8339ba;hp=7d59b82667bd41a5f42e90c0805f788a838329ef;hpb=1c63b0651a5d039076d8027c7cd87960e4151408;p=palacios.git diff --git a/palacios/src/palacios/vmm_ctrl_regs.c b/palacios/src/palacios/vmm_ctrl_regs.c index 7d59b82..0322c07 100644 --- a/palacios/src/palacios/vmm_ctrl_regs.c +++ b/palacios/src/palacios/vmm_ctrl_regs.c @@ -6,6 +6,9 @@ #include + +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?) @@ -17,235 +20,305 @@ int handle_cr0_write(struct guest_info * info) { char instr[15]; - if (info->cpu_mode == REAL) { - int index = 0; - int ret; + 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; - } + // 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++; - } + 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)) { + 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; + 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); + real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); + + addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16); - 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 (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; + } - if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) { - // gpf the guest + 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; } - - new_cr0 = (struct cr0_real *)host_addr; - } else { - // 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; - } + 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; + new_cr0_val = *(char*)(new_cr0) & 0x0f; - if (info->page_mode == SHADOW_PAGING) { - struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); - 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; + 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; + *(char*)shadow_cr0 &= 0xf0; + *(char*)shadow_cr0 |= new_cr0_val; - 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; + 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; - PrintDebug("New CR0=%x\n", *real_cr0); - } + PrintDebug("New CR0=%x\n", *real_cr0); + } - info->rip += index; + info->rip += index; - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] == clts_byte)) { - // CLTS - PrintDebug("CLTS unhandled\n"); - return -1; + } else if ((instr[index] == cr_access_byte) && + (instr[index + 1] == clts_byte)) { + // CLTS + PrintDebug("CLTS unhandled in CR0 write\n"); + return -1; - } 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; + } 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; - index += 2; + index += 2; - real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); + real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - if (addr_type != REG_OPERAND) { - /* Mov to CR0 Can only be a 32 bit register */ - // FIX ME - return -1; - } + 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; + new_cr0 = (struct cr0_32 *)first_operand; - if (new_cr0->pe == 1) { - PrintDebug("Entering Protected Mode\n"); - info->cpu_mode = PROTECTED; - } + if (new_cr0->pe == 1) { + PrintDebug("Entering Protected Mode\n"); + info->cpu_mode = PROTECTED; + } - if (new_cr0->pg == 1) { - // GPF the guest?? - return -1; - } + if (new_cr0->pe == 0) { + PrintDebug("Entering Real Mode\n"); + info->cpu_mode = REAL; + } + + + if (new_cr0->pg == 1) { + PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n"); - if (info->page_mode == SHADOW_PAGING) { - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + // 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, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - *real_cr0 = *new_cr0; - real_cr0->pg = 1; + 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; + *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; - 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); + PrintDebug("Unsupported Instruction\n"); + // unsupported instruction, UD the guest + return -1; } - 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; + } - } else if (info->cpu_mode == PROTECTED) { - int index = 0; - int ret; + while (is_prefix_byte(instr[index])) { + index++; + } - PrintDebug("Protected Mode write to CR0\n"); + struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - // 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; - } + struct cr0_32 * real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - while (is_prefix_byte(instr[index])) { - index++; - } + if ((instr[index] == cr_access_byte) && + (instr[index + 1] == mov_to_cr_byte)) { - 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 *real_cr0; - struct cr0_32 *new_cr0; - operand_type_t addr_type; + addr_t first_operand; + addr_t second_operand; + struct cr0_32 *new_cr0; + operand_type_t addr_type; - index += 2; + index += 2; - real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + 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 (addr_type != REG_OPERAND) { - 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 (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? - if (new_cr0->pg == 1){ - struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); + struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); - info->cpu_mode = PROTECTED_PG; + info->mem_mode = VIRTUAL_MEM; - *shadow_cr0 = *new_cr0; - *real_cr0 = *new_cr0; + *shadow_cr0 = *new_cr0; + *real_cr0 = *new_cr0; - // - // Activate Shadow Paging - // - PrintDebug("Turning on paging in the guest\n"); + // + // Activate Shadow Paging + // + PrintDebug("Turning on paging in the guest\n"); - info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; + info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; - } else if (new_cr0->pe == 0) { - info->cpu_mode = REAL; + } else if (new_cr0->pe == 0) { + info->cpu_mode = REAL; - *shadow_cr0 = *new_cr0; + *shadow_cr0 = *new_cr0; + *real_cr0 = *new_cr0; + real_cr0->pg = 1; + } + + + } else { *real_cr0 = *new_cr0; - real_cr0->pg = 1; } + 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 { - *real_cr0 = *new_cr0; + PrintDebug("Unkown instruction: \n"); + SerialMemDump(instr,15); + return -1; } - - info->rip += index; } + break; - } else { - PrintDebug("Unknown Mode write to CR0\n"); + 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"); return -1; + + default: + { + PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode); + return -1; + } + break; + } + return 0; } @@ -253,151 +326,203 @@ int handle_cr0_write(struct guest_info * info) { int handle_cr0_read(struct guest_info * info) { char instr[15]; - if (info->cpu_mode == REAL) { - int index = 0; - int ret; + switch (info->cpu_mode) { - // 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; - } + case REAL: + { + int index = 0; + int ret; - while (is_prefix_byte(instr[index])) { - index++; - } + PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == smsw_byte) && - (MODRM_REG(instr[index + 2]) == smsw_reg_byte)) { + // 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; + } - addr_t first_operand; - addr_t second_operand; - struct cr0_real *cr0; - operand_type_t addr_type; - char cr0_val = 0; - index += 2; + 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) + + addr_t first_operand; + addr_t second_operand; + struct cr0_real *cr0; + operand_type_t addr_type; + char cr0_val = 0; + + index += 2; - cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); + cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16); + 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 (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; - } + 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?? - } + first_operand = host_addr; + } else { + // Register operand + // Should be ok?? + } - cr0_val = *(char*)cr0 & 0x0f; + cr0_val = *(char*)cr0 & 0x0f; - *(char *)first_operand &= 0xf0; - *(char *)first_operand |= cr0_val; + *(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)); - } 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; + PrintDebug("index = %d, rip = %x\n", index, (ulong_t)(info->rip)); + info->rip += index; + PrintDebug("new_rip = %x\n", (ulong_t)(info->rip)); + // success - struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0); + } 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; - index += 2; + struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0); - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + 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; + struct cr0_32 * virt_cr0 = (struct cr0_32 *)first_operand; - if (addr_type != REG_OPERAND) { - // invalid opcode to guest - PrintDebug("Invalid operand type in mov from CR0\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; - if (info->page_mode == SHADOW_PAGING) { - *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); } else { - *virt_cr0 = *real_cr0; + PrintDebug("Unknown read instr from CR0\n"); + return -1; } - info->rip += index; + } - } else { - PrintDebug("Unknown read instr from CR0\n"); - return -1; - } + break; - } else if (info->cpu_mode == PROTECTED) { - int index = 0; - int ret; + case PROTECTED: + { + + 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); + } - // 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 Proteced mode instruction (ret=%d)\n", ret); - return -1; - } + 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++; - } + while (is_prefix_byte(instr[index])) { + index++; + } - if ((instr[index] == cr_access_byte) && - (instr[index+1] == mov_from_cr_byte)) { - 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); + if ((instr[index] == cr_access_byte) && + (instr[index+1] == mov_from_cr_byte)) { + + // MOV from CR0 to register - index += 2; + 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); - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + index += 2; - if (addr_type != REG_OPERAND) { - PrintDebug("Invalid operand type in mov from CR0\n"); - return -1; - } + 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; + virt_cr0 = (struct cr0_32 *)first_operand; - if (info->page_mode == SHADOW_PAGING) { - *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - } else { - *virt_cr0 = *real_cr0; - } + 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; + } - info->rip += index; + info->rip += index; - } else { - PrintDebug("Unknown read instruction from CR0\n"); - return -1; + } else { + PrintDebug("Unknown read instruction from CR0\n"); + return -1; + } } + break; - } else { - PrintDebug("Unknown mode read from CR0\n"); + case PROTECTED_PAE: + PrintDebug("Protected PAE Mode read to CR0 is UNIMPLEMENTED\n"); + return -1; + + case LONG: + PrintDebug("Protected Long 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); + return -1; + } + break; } @@ -408,14 +533,28 @@ 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 == 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); + } - /* 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; @@ -445,27 +584,53 @@ 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); + + 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(shadow_cr3)); + 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); - 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; } @@ -475,10 +640,11 @@ int handle_cr3_write(struct guest_info * info) { } else { PrintDebug("Unknown Instruction\n"); + SerialMemDump(instr,15); return -1; } } else { - PrintDebug("Invalid operating Mode\n"); + PrintDebug("Invalid operating Mode (0x%x)\n", info->cpu_mode); return -1; } @@ -489,12 +655,22 @@ 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 == 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; @@ -523,7 +699,7 @@ 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; @@ -532,10 +708,11 @@ int handle_cr3_read(struct guest_info * info) { info->rip += index; } else { PrintDebug("Unknown Instruction\n"); + SerialMemDump(instr,15); return -1; } } else { - PrintDebug("Invalid operating Mode\n"); + PrintDebug("Invalid operating Mode (0x%x)\n", info->cpu_mode); return -1; }