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/*
* x86 segmentation related helpers: (sysemu-only code)
* TSS, interrupts, system calls, jumps and call/task gates, descriptors
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#include "tcg/helper-tcg.h"
#include "../seg_helper.h"
void helper_syscall(CPUX86State *env, int next_eip_addend)
{
int selector;
if (!(env->efer & MSR_EFER_SCE)) {
raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
}
selector = (env->star >> 32) & 0xffff;
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
int code64;
env->regs[R_ECX] = env->eip + next_eip_addend;
env->regs[11] = cpu_compute_eflags(env) & ~RF_MASK;
code64 = env->hflags & HF_CS64_MASK;
env->eflags &= ~(env->fmask | RF_MASK);
cpu_load_eflags(env, env->eflags, 0);
cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
DESC_L_MASK);
cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
if (code64) {
env->eip = env->lstar;
} else {
env->eip = env->cstar;
}
} else
#endif
{
env->regs[R_ECX] = (uint32_t)(env->eip + next_eip_addend);
env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
env->eip = (uint32_t)env->star;
}
}
void handle_even_inj(CPUX86State *env, int intno, int is_int,
int error_code, int is_hw, int rm)
{
CPUState *cs = env_cpu(env);
uint32_t event_inj = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj));
if (!(event_inj & SVM_EVTINJ_VALID)) {
int type;
if (is_int) {
type = SVM_EVTINJ_TYPE_SOFT;
} else {
type = SVM_EVTINJ_TYPE_EXEPT;
}
event_inj = intno | type | SVM_EVTINJ_VALID;
if (!rm && exception_has_error_code(intno)) {
event_inj |= SVM_EVTINJ_VALID_ERR;
x86_stl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj_err),
error_code);
}
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
event_inj);
}
}
void x86_cpu_do_interrupt(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
if (cs->exception_index == EXCP_VMEXIT) {
assert(env->old_exception == -1);
do_vmexit(env);
} else {
do_interrupt_all(cpu, cs->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip, 0);
/* successfully delivered */
env->old_exception = -1;
}
}
bool x86_need_replay_interrupt(int interrupt_request)
{
/*
* CPU_INTERRUPT_POLL is a virtual event which gets converted into a
* "real" interrupt event later. It does not need to be recorded for
* replay purposes.
*/
return !(interrupt_request & CPU_INTERRUPT_POLL);
}
bool x86_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
int intno;
interrupt_request = x86_cpu_pending_interrupt(cs, interrupt_request);
if (!interrupt_request) {
return false;
}
/* Don't process multiple interrupt requests in a single call.
* This is required to make icount-driven execution deterministic.
*/
switch (interrupt_request) {
case CPU_INTERRUPT_POLL:
cs->interrupt_request &= ~CPU_INTERRUPT_POLL;
apic_poll_irq(cpu->apic_state);
break;
case CPU_INTERRUPT_SIPI:
do_cpu_sipi(cpu);
break;
case CPU_INTERRUPT_SMI:
cpu_svm_check_intercept_param(env, SVM_EXIT_SMI, 0, 0);
cs->interrupt_request &= ~CPU_INTERRUPT_SMI;
do_smm_enter(cpu);
break;
case CPU_INTERRUPT_NMI:
cpu_svm_check_intercept_param(env, SVM_EXIT_NMI, 0, 0);
cs->interrupt_request &= ~CPU_INTERRUPT_NMI;
env->hflags2 |= HF2_NMI_MASK;
do_interrupt_x86_hardirq(env, EXCP02_NMI, 1);
break;
case CPU_INTERRUPT_MCE:
cs->interrupt_request &= ~CPU_INTERRUPT_MCE;
do_interrupt_x86_hardirq(env, EXCP12_MCHK, 0);
break;
case CPU_INTERRUPT_HARD:
cpu_svm_check_intercept_param(env, SVM_EXIT_INTR, 0, 0);
cs->interrupt_request &= ~(CPU_INTERRUPT_HARD |
CPU_INTERRUPT_VIRQ);
intno = cpu_get_pic_interrupt(env);
qemu_log_mask(CPU_LOG_INT,
"Servicing hardware INT=0x%02x\n", intno);
do_interrupt_x86_hardirq(env, intno, 1);
break;
case CPU_INTERRUPT_VIRQ:
cpu_svm_check_intercept_param(env, SVM_EXIT_VINTR, 0, 0);
intno = x86_ldl_phys(cs, env->vm_vmcb
+ offsetof(struct vmcb, control.int_vector));
qemu_log_mask(CPU_LOG_INT,
"Servicing virtual hardware INT=0x%02x\n", intno);
do_interrupt_x86_hardirq(env, intno, 1);
cs->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
env->int_ctl &= ~V_IRQ_MASK;
break;
}
/* Ensure that no TB jump will be modified as the program flow was changed. */
return true;
}
/* check if Port I/O is allowed in TSS */
void helper_check_io(CPUX86State *env, uint32_t addr, uint32_t size)
{
uintptr_t retaddr = GETPC();
uint32_t io_offset, val, mask;
/* TSS must be a valid 32 bit one */
if (!(env->tr.flags & DESC_P_MASK) ||
((env->tr.flags >> DESC_TYPE_SHIFT) & 0xf) != 9 ||
env->tr.limit < 103) {
goto fail;
}
io_offset = cpu_lduw_kernel_ra(env, env->tr.base + 0x66, retaddr);
io_offset += (addr >> 3);
/* Note: the check needs two bytes */
if ((io_offset + 1) > env->tr.limit) {
goto fail;
}
val = cpu_lduw_kernel_ra(env, env->tr.base + io_offset, retaddr);
val >>= (addr & 7);
mask = (1 << size) - 1;
/* all bits must be zero to allow the I/O */
if ((val & mask) != 0) {
fail:
raise_exception_err_ra(env, EXCP0D_GPF, 0, retaddr);
}
}
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