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Bochs/bochs/cpu/proc_ctrl.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2012 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
//
/////////////////////////////////////////////////////////////////////////
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#include "param_names.h"
#include "cpu.h"
#define LOG_THIS BX_CPU_THIS_PTR
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::UndefinedOpcode(bxInstruction_c *i)
{
BX_DEBUG(("UndefinedOpcode: generate #UD exception"));
exception(BX_UD_EXCEPTION, 0);
BX_NEXT_TRACE(i); // keep compiler happy
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::NOP(bxInstruction_c *i)
{
// No operation.
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::PAUSE(bxInstruction_c *i)
{
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest)
VMexit_PAUSE(i);
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_PAUSE)) Svm_Vmexit(SVM_VMEXIT_PAUSE);
}
#endif
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::PREFETCH(bxInstruction_c *i)
{
#if BX_INSTRUMENTATION
BX_INSTR_PREFETCH_HINT(BX_CPU_ID, i->nnn(), i->seg(),
BX_CPU_CALL_METHODR(i->ResolveModrm, (i)));
#endif
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CPUID(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 4
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
BX_ERROR(("VMEXIT: CPUID in VMX non-root operation"));
VMexit(i, VMX_VMEXIT_CPUID, 0);
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_CPUID)) Svm_Vmexit(SVM_VMEXIT_CPUID);
}
#endif
struct cpuid_function_t leaf;
BX_CPU_THIS_PTR cpuid->get_cpuid_leaf(EAX, ECX, &leaf);
RAX = leaf.eax;
RBX = leaf.ebx;
RCX = leaf.ecx;
RDX = leaf.edx;
#endif
BX_NEXT_INSTR(i);
}
//
// The shutdown state is very similar to the state following the exection
// if HLT instruction. In this mode the processor stops executing
// instructions until #NMI, #SMI, #RESET or #INIT is received. If
// shutdown occurs why in NMI interrupt handler or in SMM, a hardware
// reset must be used to restart the processor execution.
//
void BX_CPU_C::shutdown(void)
{
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_SHUTDOWN)) Svm_Vmexit(SVM_VMEXIT_SHUTDOWN);
}
#endif
BX_PANIC(("Entering to shutdown state still not implemented"));
BX_CPU_THIS_PTR clear_IF();
// artificial trap bit, why use another variable.
BX_CPU_THIS_PTR activity_state = BX_ACTIVITY_STATE_HLT;
BX_CPU_THIS_PTR async_event = 1; // so processor knows to check
// Execution of this instruction completes. The processor
// will remain in a halt state until one of the above conditions
// is met.
BX_INSTR_HLT(BX_CPU_ID);
#if BX_DEBUGGER
bx_dbg_halt(BX_CPU_ID);
#endif
#if BX_USE_IDLE_HACK
bx_gui->sim_is_idle();
#endif
longjmp(BX_CPU_THIS_PTR jmp_buf_env, 1); // go back to main decode loop
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::HLT(bxInstruction_c *i)
{
// CPL is always 0 in real mode
if (/* !real_mode() && */ CPL!=0) {
BX_DEBUG(("HLT: %s priveledge check failed, CPL=%d, generate #GP(0)",
cpu_mode_string(BX_CPU_THIS_PTR cpu_mode), CPL));
exception(BX_GP_EXCEPTION, 0);
}
if (! BX_CPU_THIS_PTR get_IF()) {
BX_INFO(("WARNING: HLT instruction with IF=0!"));
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_HLT_VMEXIT)) {
BX_ERROR(("VMEXIT: HLT"));
VMexit(i, VMX_VMEXIT_HLT, 0);
}
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_HLT)) Svm_Vmexit(SVM_VMEXIT_HLT);
}
#endif
// stops instruction execution and places the processor in a
// HALT state. An enabled interrupt, NMI, or reset will resume
// execution. If interrupt (including NMI) is used to resume
// execution after HLT, the saved CS:eIP points to instruction
// following HLT.
// artificial trap bit, why use another variable.
BX_CPU_THIS_PTR activity_state = BX_ACTIVITY_STATE_HLT;
BX_CPU_THIS_PTR async_event = 1; // so processor knows to check
// Execution of this instruction completes. The processor
// will remain in a halt state until one of the above conditions
// is met.
BX_INSTR_HLT(BX_CPU_ID);
#if BX_DEBUGGER
bx_dbg_halt(BX_CPU_ID);
#endif
#if BX_USE_IDLE_HACK
bx_gui->sim_is_idle();
#endif
BX_NEXT_TRACE(i);
}
/* 0F 08 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::INVD(bxInstruction_c *i)
{
// CPL is always 0 in real mode
if (/* !real_mode() && */ CPL!=0) {
BX_ERROR(("INVD: priveledge check failed, generate #GP(0)"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
BX_ERROR(("VMEXIT: INVD in VMX non-root operation"));
VMexit(i, VMX_VMEXIT_INVD, 0);
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_INVD)) Svm_Vmexit(SVM_VMEXIT_INVD);
}
#endif
invalidate_prefetch_q();
BX_DEBUG(("INVD: Flush internal caches !"));
BX_INSTR_CACHE_CNTRL(BX_CPU_ID, BX_INSTR_INVD);
flushICaches();
BX_NEXT_TRACE(i);
}
/* 0F 09 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::WBINVD(bxInstruction_c *i)
{
// CPL is always 0 in real mode
if (/* !real_mode() && */ CPL!=0) {
BX_ERROR(("INVD/WBINVD: priveledge check failed, generate #GP(0)"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (SECONDARY_VMEXEC_CONTROL(VMX_VM_EXEC_CTRL3_WBINVD_VMEXIT)) {
BX_ERROR(("VMEXIT: WBINVD in VMX non-root operation"));
VMexit(i, VMX_VMEXIT_WBINVD, 0);
}
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT1_WBINVD)) Svm_Vmexit(SVM_VMEXIT_WBINVD);
}
#endif
invalidate_prefetch_q();
BX_DEBUG(("WBINVD: Flush internal caches !"));
BX_INSTR_CACHE_CNTRL(BX_CPU_ID, BX_INSTR_WBINVD);
flushICaches();
BX_NEXT_TRACE(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CLFLUSH(bxInstruction_c *i)
{
bx_segment_reg_t *seg = &BX_CPU_THIS_PTR sregs[i->seg()];
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
bx_address laddr = get_laddr(i->seg(), eaddr);
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
if (! IsCanonical(laddr)) {
BX_ERROR(("CLFLUSH: non-canonical access !"));
exception(int_number(i->seg()), 0);
}
}
else
#endif
{
// check if we could access the memory segment
if (!(seg->cache.valid & SegAccessROK)) {
if (! execute_virtual_checks(seg, (Bit32u) eaddr, 1))
exception(int_number(i->seg()), 0);
}
else {
if (eaddr > seg->cache.u.segment.limit_scaled) {
BX_ERROR(("CLFLUSH: segment limit violation"));
exception(int_number(i->seg()), 0);
}
}
}
#if BX_INSTRUMENTATION
bx_phy_address paddr =
#endif
translate_linear(laddr, USER_PL, BX_READ);
BX_INSTR_CLFLUSH(BX_CPU_ID, laddr, paddr);
#if BX_X86_DEBUGGER
hwbreakpoint_match(laddr, 1, BX_READ);
#endif
BX_NEXT_INSTR(i);
}
void BX_CPU_C::handleCpuModeChange(void)
{
unsigned mode = BX_CPU_THIS_PTR cpu_mode;
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR efer.get_LMA()) {
if (! BX_CPU_THIS_PTR cr0.get_PE()) {
BX_PANIC(("change_cpu_mode: EFER.LMA is set when CR0.PE=0 !"));
}
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l) {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_LONG_64;
}
else {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_LONG_COMPAT;
// clear upper part of RIP/RSP when leaving 64-bit long mode
BX_CLEAR_64BIT_HIGH(BX_64BIT_REG_RIP);
BX_CLEAR_64BIT_HIGH(BX_64BIT_REG_RSP);
}
// switching between compatibility and long64 mode also affect SS.BASE
// which is always zero in long64 mode
invalidate_stack_cache();
}
else
#endif
{
if (BX_CPU_THIS_PTR cr0.get_PE()) {
if (BX_CPU_THIS_PTR get_VM()) {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_IA32_V8086;
CPL = 3;
}
else
BX_CPU_THIS_PTR cpu_mode = BX_MODE_IA32_PROTECTED;
}
else {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_IA32_REAL;
// CS segment in real mode always allows full access
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
CPL = 0;
}
}
updateFetchModeMask();
#if BX_CPU_LEVEL >= 6
#if BX_SUPPORT_AVX
handleAvxModeChange();
#endif
#endif
if (mode != BX_CPU_THIS_PTR cpu_mode) {
BX_DEBUG(("%s activated", cpu_mode_string(BX_CPU_THIS_PTR cpu_mode)));
#if BX_DEBUGGER
if (BX_CPU_THIS_PTR mode_break) {
BX_CPU_THIS_PTR stop_reason = STOP_MODE_BREAK_POINT;
bx_debug_break(); // trap into debugger
}
#endif
}
}
#if BX_CPU_LEVEL >= 4
void BX_CPU_C::handleAlignmentCheck(void)
{
if (CPL == 3 && BX_CPU_THIS_PTR cr0.get_AM() && BX_CPU_THIS_PTR get_AC()) {
#if BX_SUPPORT_ALIGNMENT_CHECK == 0
BX_PANIC(("WARNING: Alignment check (#AC exception) was not compiled in !"));
#else
BX_CPU_THIS_PTR alignment_check_mask = 0xF;
#endif
}
#if BX_SUPPORT_ALIGNMENT_CHECK
else {
BX_CPU_THIS_PTR alignment_check_mask = 0;
}
#endif
}
#endif
#if BX_CPU_LEVEL >= 6
void BX_CPU_C::handleSseModeChange(void)
{
if(BX_CPU_THIS_PTR cr0.get_TS()) {
BX_CPU_THIS_PTR sse_ok = 0;
}
else {
if(BX_CPU_THIS_PTR cr0.get_EM() || !BX_CPU_THIS_PTR cr4.get_OSFXSR())
BX_CPU_THIS_PTR sse_ok = 0;
else
BX_CPU_THIS_PTR sse_ok = 1;
}
updateFetchModeMask(); /* SSE_OK changed */
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::BxNoSSE(bxInstruction_c *i)
{
if(BX_CPU_THIS_PTR cr0.get_EM() || !BX_CPU_THIS_PTR cr4.get_OSFXSR())
exception(BX_UD_EXCEPTION, 0);
if(BX_CPU_THIS_PTR cr0.get_TS())
exception(BX_NM_EXCEPTION, 0);
BX_ASSERT(0);
BX_NEXT_TRACE(i); // keep compiler happy
}
#if BX_SUPPORT_AVX
void BX_CPU_C::handleAvxModeChange(void)
{
if(BX_CPU_THIS_PTR cr0.get_TS()) {
BX_CPU_THIS_PTR avx_ok = 0;
}
else {
if (! protected_mode() || ! BX_CPU_THIS_PTR cr4.get_OSXSAVE() ||
(~BX_CPU_THIS_PTR xcr0.val32 & 0x6) != 0) BX_CPU_THIS_PTR avx_ok = 0;
else
BX_CPU_THIS_PTR avx_ok = 1;
}
updateFetchModeMask(); /* AVX_OK changed */
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::BxNoAVX(bxInstruction_c *i)
{
if (! protected_mode() || ! BX_CPU_THIS_PTR cr4.get_OSXSAVE())
exception(BX_UD_EXCEPTION, 0);
if (~BX_CPU_THIS_PTR xcr0.val32 & 0x6)
exception(BX_UD_EXCEPTION, 0);
if(BX_CPU_THIS_PTR cr0.get_TS())
exception(BX_NM_EXCEPTION, 0);
BX_ASSERT(0);
BX_NEXT_TRACE(i); // keep compiler happy
}
#endif
#endif
void BX_CPU_C::handleCpuContextChange(void)
{
TLB_flush();
#if BX_SUPPORT_MONITOR_MWAIT
BX_CPU_THIS_PTR monitor.reset_monitor();
#endif
invalidate_prefetch_q();
invalidate_stack_cache();
#if BX_CPU_LEVEL >= 4
handleAlignmentCheck();
#endif
handleCpuModeChange();
#if BX_CPU_LEVEL >= 6
handleSseModeChange();
#if BX_SUPPORT_AVX
handleAvxModeChange();
#endif
#endif
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RDPMC(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 5
if (! BX_CPU_THIS_PTR cr4.get_PCE() && CPL != 0 ) {
BX_ERROR(("RDPMC: not allowed to use instruction !"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_RDPMC_VMEXIT)) {
BX_ERROR(("VMEXIT: RDPMC"));
VMexit(i, VMX_VMEXIT_RDPMC, 0);
}
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT0_RDPMC)) Svm_Vmexit(SVM_VMEXIT_RDPMC);
}
#endif
/* According to manual, Pentium 4 has 18 counters,
* previous versions have two. And the P4 also can do
* short read-out (EDX always 0). Otherwise it is
* limited to 40 bits.
*/
if (BX_CPUID_SUPPORT_ISA_EXTENSION(BX_ISA_SSE2)) { // Pentium 4 processor (see cpuid.cc)
if ((ECX & 0x7fffffff) >= 18)
exception(BX_GP_EXCEPTION, 0);
}
else {
if ((ECX & 0xffffffff) >= 2)
exception(BX_GP_EXCEPTION, 0);
}
// Most counters are for hardware specific details, which
// we anyhow do not emulate (like pipeline stalls etc)
// Could be interesting to count number of memory reads,
// writes. Misaligned etc... But to monitor bochs, this
// is easier done from the host.
RAX = 0;
RDX = 0; // if P4 and ECX & 0x10000000, then always 0 (short read 32 bits)
BX_ERROR(("RDPMC: Performance Counters Support not implemented yet"));
#endif
BX_NEXT_INSTR(i);
}
#if BX_CPU_LEVEL >= 5
Bit64u BX_CPU_C::get_TSC(void)
{
Bit64u tsc = bx_pc_system.time_ticks() - BX_CPU_THIS_PTR tsc_last_reset;
#if BX_SUPPORT_VMX || BX_SUPPORT_SVM
tsc += BX_CPU_THIS_PTR tsc_offset;
#endif
return tsc;
}
void BX_CPU_C::set_TSC(Bit64u newval)
{
// compute the correct setting of tsc_last_reset so that a get_TSC()
// will return newval
BX_CPU_THIS_PTR tsc_last_reset = bx_pc_system.time_ticks() - newval;
// verify
BX_ASSERT(get_TSC() == newval);
}
#endif
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RDTSC(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 5
if (BX_CPU_THIS_PTR cr4.get_TSD() && CPL != 0) {
BX_ERROR(("RDTSC: not allowed to use instruction !"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_RDTSC_VMEXIT)) {
BX_ERROR(("VMEXIT: RDTSC"));
VMexit(i, VMX_VMEXIT_RDTSC, 0);
}
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest)
if (SVM_INTERCEPT(SVM_INTERCEPT0_RDTSC)) Svm_Vmexit(SVM_VMEXIT_RDTSC);
#endif
// return ticks
Bit64u ticks = BX_CPU_THIS_PTR get_TSC();
RAX = GET32L(ticks);
RDX = GET32H(ticks);
BX_DEBUG(("RDTSC: ticks 0x%08x:%08x", EDX, EAX));
#endif
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RDTSCP(bxInstruction_c *i)
{
#if BX_SUPPORT_X86_64
#if BX_SUPPORT_VMX
// RDTSCP will always #UD in legacy VMX mode
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (! SECONDARY_VMEXEC_CONTROL(VMX_VM_EXEC_CTRL3_RDTSCP)) {
BX_ERROR(("RDTSCP in VMX guest: not allowed to use instruction !"));
exception(BX_UD_EXCEPTION, 0);
}
}
#endif
if (BX_CPU_THIS_PTR cr4.get_TSD() && CPL != 0) {
BX_ERROR(("RDTSCP: not allowed to use instruction !"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_RDTSC_VMEXIT)) {
BX_ERROR(("VMEXIT: RDTSCP"));
VMexit(i, VMX_VMEXIT_RDTSCP, 0);
}
}
#endif
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest)
if (SVM_INTERCEPT(SVM_INTERCEPT1_RDTSCP)) Svm_Vmexit(SVM_VMEXIT_RDTSCP);
#endif
// return ticks
Bit64u ticks = BX_CPU_THIS_PTR get_TSC();
RAX = GET32L(ticks);
RDX = GET32H(ticks);
RCX = MSR_TSC_AUX;
#endif
BX_NEXT_INSTR(i);
}
#if BX_SUPPORT_MONITOR_MWAIT
bx_bool BX_CPU_C::is_monitor(bx_phy_address begin_addr, unsigned len)
{
if (! BX_CPU_THIS_PTR monitor.armed) return 0;
bx_phy_address monitor_begin = BX_CPU_THIS_PTR monitor.monitor_addr;
bx_phy_address monitor_end = monitor_begin + CACHE_LINE_SIZE - 1;
bx_phy_address end_addr = begin_addr + len;
if (begin_addr >= monitor_end || end_addr <= monitor_begin)
return 0;
else
return 1;
}
void BX_CPU_C::check_monitor(bx_phy_address begin_addr, unsigned len)
{
if (is_monitor(begin_addr, len)) {
// wakeup from MWAIT state
if(BX_CPU_THIS_PTR activity_state >= BX_ACTIVITY_STATE_MWAIT)
BX_CPU_THIS_PTR activity_state = BX_ACTIVITY_STATE_ACTIVE;
// clear monitor
BX_CPU_THIS_PTR monitor.reset_monitor();
}
}
#endif
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::MONITOR(bxInstruction_c *i)
{
#if BX_SUPPORT_MONITOR_MWAIT
// CPL is always 0 in real mode
if (/* !real_mode() && */ CPL != 0) {
BX_DEBUG(("MWAIT instruction not recognized when CPL != 0"));
exception(BX_UD_EXCEPTION, 0);
}
BX_DEBUG(("MONITOR instruction executed EAX = 0x%08x", EAX));
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_MONITOR_VMEXIT)) {
BX_ERROR(("VMEXIT: MONITOR"));
VMexit(i, VMX_VMEXIT_MONITOR, 0);
}
}
#endif
if (RCX != 0) {
BX_ERROR(("MONITOR: no optional extensions supported"));
exception(BX_GP_EXCEPTION, 0);
}
bx_segment_reg_t *seg = &BX_CPU_THIS_PTR sregs[i->seg()];
bx_address offset = RAX & i->asize_mask();
// set MONITOR
bx_address laddr = get_laddr(i->seg(), offset);
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
if (! IsCanonical(laddr)) {
BX_ERROR(("MONITOR: non-canonical access !"));
exception(int_number(i->seg()), 0);
}
}
else
#endif
{
// check if we could access the memory segment
if (!(seg->cache.valid & SegAccessROK)) {
if (! execute_virtual_checks(seg, (Bit32u) offset, 1))
exception(int_number(i->seg()), 0);
}
else {
if (offset > seg->cache.u.segment.limit_scaled) {
BX_ERROR(("MONITOR: segment limit violation"));
exception(int_number(i->seg()), 0);
}
}
}
bx_phy_address paddr = translate_linear(laddr, USER_PL, BX_READ);
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT1_MONITOR)) Svm_Vmexit(SVM_VMEXIT_MONITOR);
}
#endif
// Set the monitor immediately. If monitor is still armed when we MWAIT,
// the processor will stall.
bx_pc_system.invlpg(paddr);
BX_CPU_THIS_PTR monitor.arm(paddr);
BX_DEBUG(("MONITOR for phys_addr=0x" FMT_PHY_ADDRX, BX_CPU_THIS_PTR monitor.monitor_addr));
#endif
BX_NEXT_INSTR(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::MWAIT(bxInstruction_c *i)
{
#if BX_SUPPORT_MONITOR_MWAIT
// CPL is always 0 in real mode
if (/* !real_mode() && */ CPL != 0) {
BX_DEBUG(("MWAIT instruction not recognized when CPL != 0"));
exception(BX_UD_EXCEPTION, 0);
}
BX_DEBUG(("MWAIT instruction executed ECX = 0x%08x", ECX));
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
if (VMEXIT(VMX_VM_EXEC_CTRL2_MWAIT_VMEXIT)) {
BX_ERROR(("VMEXIT: MWAIT"));
VMexit(i, VMX_VMEXIT_MWAIT, BX_CPU_THIS_PTR monitor.armed);
}
}
#endif
// only one extension is supported
// ECX[0] - interrupt MWAIT even if EFLAGS.IF = 0
if (RCX & ~(BX_CONST64(1))) {
BX_ERROR(("MWAIT: incorrect optional extensions in RCX"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_SVM
if (BX_CPU_THIS_PTR in_svm_guest) {
if (SVM_INTERCEPT(SVM_INTERCEPT1_MWAIT_ARMED))
if (BX_CPU_THIS_PTR monitor.armed) Svm_Vmexit(SVM_VMEXIT_MWAIT_CONDITIONAL);
if (SVM_INTERCEPT(SVM_INTERCEPT1_MWAIT)) Svm_Vmexit(SVM_VMEXIT_MWAIT);
}
#endif
// If monitor has already triggered, we just return.
if (! BX_CPU_THIS_PTR monitor.armed) {
BX_DEBUG(("MWAIT: the MONITOR was not armed or already triggered"));
BX_NEXT_TRACE(i);
}
static bx_bool mwait_is_nop = SIM->get_param_bool(BXPN_MWAIT_IS_NOP)->get();
if (mwait_is_nop) {
BX_NEXT_TRACE(i);
}
// stops instruction execution and places the processor in a optimized
// state. Events that cause exit from MWAIT state are:
// A store from another processor to monitored range, any unmasked
// interrupt, including INTR, NMI, SMI, INIT or reset will resume
// the execution. Any far control transfer between MONITOR and MWAIT
// resets the monitoring logic.
if (ECX & 1) {
#if BX_SUPPORT_VMX
// When "interrupt window exiting" VMX control is set MWAIT instruction
// won't cause the processor to enter BX_ACTIVITY_STATE_MWAIT_IF sleep
// state with EFLAGS.IF = 0
if (BX_CPU_THIS_PTR vmx_interrupt_window && ! BX_CPU_THIS_PTR get_IF()) {
BX_NEXT_TRACE(i);
}
#endif
BX_CPU_THIS_PTR activity_state = BX_ACTIVITY_STATE_MWAIT_IF;
}
else {
BX_CPU_THIS_PTR activity_state = BX_ACTIVITY_STATE_MWAIT;
}
BX_CPU_THIS_PTR async_event = 1; // so processor knows to check
// Execution of this instruction completes. The processor
// will remain in a optimized state until one of the above
// conditions is met.
BX_INSTR_MWAIT(BX_CPU_ID, BX_CPU_THIS_PTR monitor.monitor_addr, CACHE_LINE_SIZE, ECX);
#if BX_USE_IDLE_HACK
bx_gui->sim_is_idle();
#endif
#if BX_DEBUGGER
bx_dbg_halt(BX_CPU_ID);
#endif
#endif
BX_NEXT_TRACE(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SYSENTER(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 6
if (real_mode()) {
BX_ERROR(("SYSENTER not recognized in real mode !"));
exception(BX_GP_EXCEPTION, 0);
}
if ((BX_CPU_THIS_PTR msr.sysenter_cs_msr & BX_SELECTOR_RPL_MASK) == 0) {
BX_ERROR(("SYSENTER with zero sysenter_cs_msr !"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
BX_CPU_THIS_PTR clear_VM(); // do this just like the book says to do
BX_CPU_THIS_PTR clear_IF();
BX_CPU_THIS_PTR clear_RF();
#if BX_SUPPORT_X86_64
if (long_mode()) {
if (!IsCanonical(BX_CPU_THIS_PTR msr.sysenter_eip_msr)) {
BX_ERROR(("SYSENTER with non-canonical SYSENTER_EIP_MSR !"));
exception(BX_GP_EXCEPTION, 0);
}
if (!IsCanonical(BX_CPU_THIS_PTR msr.sysenter_esp_msr)) {
BX_ERROR(("SYSENTER with non-canonical SYSENTER_ESP_MSR !"));
exception(BX_GP_EXCEPTION, 0);
}
}
#endif
parse_selector(BX_CPU_THIS_PTR msr.sysenter_cs_msr & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; // base address
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; // scaled segment limit
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; // 4k granularity
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; // available for use by system
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = !long_mode();
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = long_mode();
#endif
#if BX_SUPPORT_X86_64
handleCpuModeChange(); // mode change could happen only when in long_mode()
#else
updateFetchModeMask(/* CS reloaded */);
#endif
#if BX_SUPPORT_ALIGNMENT_CHECK
BX_CPU_THIS_PTR alignment_check_mask = 0; // CPL=0
#endif
parse_selector((BX_CPU_THIS_PTR msr.sysenter_cs_msr + 8) & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base = 0; // base address
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xFFFFFFFF; // scaled segment limit
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 1; // 4k granularity
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 1; // 32-bit mode
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0; // available for use by system
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.l = 0;
#endif
#if BX_SUPPORT_X86_64
if (long_mode()) {
RSP = BX_CPU_THIS_PTR msr.sysenter_esp_msr;
RIP = BX_CPU_THIS_PTR msr.sysenter_eip_msr;
}
else
#endif
{
ESP = (Bit32u) BX_CPU_THIS_PTR msr.sysenter_esp_msr;
EIP = (Bit32u) BX_CPU_THIS_PTR msr.sysenter_eip_msr;
}
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_SYSENTER,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, RIP);
#endif
BX_NEXT_TRACE(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SYSEXIT(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 6
if (real_mode() || CPL != 0) {
BX_ERROR(("SYSEXIT from real mode or with CPL<>0 !"));
exception(BX_GP_EXCEPTION, 0);
}
if ((BX_CPU_THIS_PTR msr.sysenter_cs_msr & BX_SELECTOR_RPL_MASK) == 0) {
BX_ERROR(("SYSEXIT with zero sysenter_cs_msr !"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
#if BX_SUPPORT_X86_64
if (i->os64L()) {
if (!IsCanonical(RDX)) {
BX_ERROR(("SYSEXIT with non-canonical RDX (RIP) pointer !"));
exception(BX_GP_EXCEPTION, 0);
}
if (!IsCanonical(RCX)) {
BX_ERROR(("SYSEXIT with non-canonical RCX (RSP) pointer !"));
exception(BX_GP_EXCEPTION, 0);
}
parse_selector(((BX_CPU_THIS_PTR msr.sysenter_cs_msr + 32) & BX_SELECTOR_RPL_MASK) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; // base address
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; // scaled segment limit
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; // 4k granularity
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; // available for use by system
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 1;
RSP = RCX;
RIP = RDX;
}
else
#endif
{
parse_selector(((BX_CPU_THIS_PTR msr.sysenter_cs_msr + 16) & BX_SELECTOR_RPL_MASK) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; // base address
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; // scaled segment limit
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; // 4k granularity
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; // available for use by system
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1;
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 0;
#endif
ESP = ECX;
EIP = EDX;
}
#if BX_SUPPORT_X86_64
handleCpuModeChange(); // mode change could happen only when in long_mode()
#else
updateFetchModeMask(/* CS reloaded */);
#endif
handleAlignmentCheck(/* CPL change */);
parse_selector(((BX_CPU_THIS_PTR msr.sysenter_cs_msr + (i->os64L() ? 40:24)) & BX_SELECTOR_RPL_MASK) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base = 0; // base address
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xFFFFFFFF; // scaled segment limit
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 1; // 4k granularity
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 1; // 32-bit mode
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0; // available for use by system
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.l = 0;
#endif
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_SYSEXIT,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, RIP);
#endif
BX_NEXT_TRACE(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SYSCALL(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 5
bx_address temp_RIP;
BX_DEBUG(("Execute SYSCALL instruction"));
if (!BX_CPU_THIS_PTR efer.get_SCE()) {
exception(BX_UD_EXCEPTION, 0);
}
invalidate_prefetch_q();
#if BX_SUPPORT_X86_64
if (long_mode())
{
RCX = RIP;
R11 = read_eflags() & ~(EFlagsRFMask);
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
temp_RIP = MSR_LSTAR;
}
else {
temp_RIP = MSR_CSTAR;
}
// set up CS segment, flat, 64-bit DPL=0
parse_selector((MSR_STAR >> 32) & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 1; /* 64-bit code */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; /* available for use by system */
handleCpuModeChange(); // mode change could only happen when in long_mode()
#if BX_SUPPORT_ALIGNMENT_CHECK
BX_CPU_THIS_PTR alignment_check_mask = 0; // CPL=0
#endif
// set up SS segment, flat, 64-bit DPL=0
parse_selector(((MSR_STAR >> 32) + 8) & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 1; /* 32 bit stack */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.l = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0; /* available for use by system */
writeEFlags(read_eflags() & (~MSR_FMASK), EFlagsValidMask);
BX_CPU_THIS_PTR clear_RF();
RIP = temp_RIP;
}
else
#endif
{
// legacy mode
ECX = EIP;
temp_RIP = MSR_STAR & 0xFFFFFFFF;
// set up CS segment, flat, 32-bit DPL=0
parse_selector((MSR_STAR >> 32) & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1;
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 0; /* 32-bit code */
#endif
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; /* available for use by system */
updateFetchModeMask(/* CS reloaded */);
#if BX_SUPPORT_ALIGNMENT_CHECK
BX_CPU_THIS_PTR alignment_check_mask = 0; // CPL=0
#endif
// set up SS segment, flat, 32-bit DPL=0
parse_selector(((MSR_STAR >> 32) + 8) & BX_SELECTOR_RPL_MASK,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 1; /* 32 bit stack */
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.l = 0;
#endif
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0; /* available for use by system */
BX_CPU_THIS_PTR clear_VM();
BX_CPU_THIS_PTR clear_IF();
BX_CPU_THIS_PTR clear_RF();
RIP = temp_RIP;
}
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_SYSCALL,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, RIP);
#endif
BX_NEXT_TRACE(i);
}
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SYSRET(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 5
bx_address temp_RIP;
BX_DEBUG(("Execute SYSRET instruction"));
if (!BX_CPU_THIS_PTR efer.get_SCE()) {
exception(BX_UD_EXCEPTION, 0);
}
if(!protected_mode() || CPL != 0) {
BX_ERROR(("SYSRET: priveledge check failed, generate #GP(0)"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64)
{
if (i->os64L()) {
if (!IsCanonical(RCX)) {
BX_ERROR(("SYSRET: canonical failure for RCX (RIP)"));
exception(BX_GP_EXCEPTION, 0);
}
// Return to 64-bit mode, set up CS segment, flat, 64-bit DPL=3
parse_selector((((MSR_STAR >> 48) + 16) & BX_SELECTOR_RPL_MASK) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 1; /* 64-bit code */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; /* available for use by system */
temp_RIP = RCX;
}
else {
// Return to 32-bit compatibility mode, set up CS segment, flat, 32-bit DPL=3
parse_selector((MSR_STAR >> 48) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 0; /* 32-bit code */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; /* available for use by system */
temp_RIP = ECX;
}
handleCpuModeChange(); // mode change could only happen when in long64 mode
handleAlignmentCheck(/* CPL change */);
// SS base, limit, attributes unchanged
parse_selector((Bit16u)(((MSR_STAR >> 48) + 8) | 3),
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
writeEFlags((Bit32u) R11, EFlagsValidMask);
}
else // (!64BIT_MODE)
#endif
{
// Return to 32-bit legacy mode, set up CS segment, flat, 32-bit DPL=3
parse_selector((MSR_STAR >> 48) | 3,
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = BX_CODE_EXEC_READ_ACCESSED;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = 0; /* base address */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xFFFFFFFF; /* scaled segment limit */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 1; /* 4k granularity */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 1;
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 0; /* 32-bit code */
#endif
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0; /* available for use by system */
updateFetchModeMask(/* CS reloaded */);
handleAlignmentCheck(/* CPL change */);
// SS base, limit, attributes unchanged
parse_selector((Bit16u)(((MSR_STAR >> 48) + 8) | 3),
&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector);
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = SegValidCache | SegAccessROK | SegAccessWOK;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = BX_DATA_READ_WRITE_ACCESSED;
BX_CPU_THIS_PTR assert_IF();
temp_RIP = ECX;
}
handleCpuModeChange();
RIP = temp_RIP;
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_SYSRET,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, RIP);
#endif
BX_NEXT_TRACE(i);
}
#if BX_SUPPORT_X86_64
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SWAPGS(bxInstruction_c *i)
{
if(CPL != 0)
exception(BX_GP_EXCEPTION, 0);
Bit64u temp_GS_base = MSR_GSBASE;
MSR_GSBASE = MSR_KERNELGSBASE;
MSR_KERNELGSBASE = temp_GS_base;
BX_NEXT_INSTR(i);
}
/* F3 0F AE /0 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RDFSBASE(bxInstruction_c *i)
{
if (! BX_CPU_THIS_PTR cr4.get_FSGSBASE())
exception(BX_UD_EXCEPTION, 0);
if (i->os64L()) {
BX_WRITE_64BIT_REG(i->rm(), MSR_FSBASE);
}
else {
BX_WRITE_32BIT_REGZ(i->rm(), (Bit32u) MSR_FSBASE);
}
BX_NEXT_INSTR(i);
}
/* F3 0F AE /1 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RDGSBASE(bxInstruction_c *i)
{
if (! BX_CPU_THIS_PTR cr4.get_FSGSBASE())
exception(BX_UD_EXCEPTION, 0);
if (i->os64L()) {
BX_WRITE_64BIT_REG(i->rm(), MSR_GSBASE);
}
else {
BX_WRITE_32BIT_REGZ(i->rm(), (Bit32u) MSR_GSBASE);
}
BX_NEXT_INSTR(i);
}
/* F3 0F AE /2 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::WRFSBASE(bxInstruction_c *i)
{
if (! BX_CPU_THIS_PTR cr4.get_FSGSBASE())
exception(BX_UD_EXCEPTION, 0);
if (i->os64L()) {
Bit64u fsbase = BX_READ_64BIT_REG(i->rm());
if (!IsCanonical(fsbase)) {
BX_ERROR(("WRFSBASE: canonical failure !"));
exception(BX_GP_EXCEPTION, 0);
}
MSR_FSBASE = fsbase;
}
else {
// 32-bit value is always canonical
MSR_FSBASE = BX_READ_32BIT_REG(i->rm());
}
BX_NEXT_INSTR(i);
}
/* F3 0F AE /3 */
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::WRGSBASE(bxInstruction_c *i)
{
if (! BX_CPU_THIS_PTR cr4.get_FSGSBASE())
exception(BX_UD_EXCEPTION, 0);
if (i->os64L()) {
Bit64u gsbase = BX_READ_64BIT_REG(i->rm());
if (!IsCanonical(gsbase)) {
BX_ERROR(("WRGSBASE: canonical failure !"));
exception(BX_GP_EXCEPTION, 0);
}
MSR_GSBASE = gsbase;
}
else {
// 32-bit value is always canonical
MSR_GSBASE = BX_READ_32BIT_REG(i->rm());
}
BX_NEXT_INSTR(i);
}
#endif
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