sc->limit = 0xffff;
}
+/* real mode iret */
+void helper_iret_real(int shift)
+{
+ uint32_t sp, new_cs, new_eip, new_eflags, new_esp;
+ uint8_t *ssp;
+ int eflags_mask;
+
+ sp = env->regs[R_ESP] & 0xffff;
+ ssp = env->segs[R_SS].base + sp;
+ if (shift == 1) {
+ /* 32 bits */
+ new_eflags = ldl(ssp + 8);
+ new_cs = ldl(ssp + 4) & 0xffff;
+ new_eip = ldl(ssp) & 0xffff;
+ } else {
+ /* 16 bits */
+ new_eflags = lduw(ssp + 4);
+ new_cs = lduw(ssp + 2);
+ new_eip = lduw(ssp);
+ }
+ new_esp = sp + (6 << shift);
+ env->regs[R_ESP] = (env->regs[R_ESP] & 0xffff0000) |
+ (new_esp & 0xffff);
+ load_seg_vm(R_CS, new_cs);
+ env->eip = new_eip;
+ eflags_mask = FL_UPDATE_CPL0_MASK;
+ if (shift == 0)
+ eflags_mask &= 0xffff;
+ load_eflags(new_eflags, eflags_mask);
+}
+
/* protected mode iret */
void helper_iret_protected(int shift)
{
EDX = val >> 32;
}
+void helper_wrmsr(void)
+{
+ switch(ECX) {
+ case MSR_IA32_SYSENTER_CS:
+ env->sysenter_cs = EAX & 0xffff;
+ break;
+ case MSR_IA32_SYSENTER_ESP:
+ env->sysenter_esp = EAX;
+ break;
+ case MSR_IA32_SYSENTER_EIP:
+ env->sysenter_eip = EAX;
+ break;
+ default:
+ /* XXX: exception ? */
+ break;
+ }
+}
+
+void helper_rdmsr(void)
+{
+ switch(ECX) {
+ case MSR_IA32_SYSENTER_CS:
+ EAX = env->sysenter_cs;
+ EDX = 0;
+ break;
+ case MSR_IA32_SYSENTER_ESP:
+ EAX = env->sysenter_esp;
+ EDX = 0;
+ break;
+ case MSR_IA32_SYSENTER_EIP:
+ EAX = env->sysenter_eip;
+ EDX = 0;
+ break;
+ default:
+ /* XXX: exception ? */
+ break;
+ }
+}
+
void helper_lsl(void)
{
unsigned int selector, limit;