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correct CPL support (should fix flat real mode support)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@343 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-07-29 20:53:01 +00:00
parent c33a346edf
commit b6d78bfa0d
4 changed files with 27 additions and 31 deletions
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31
helper-i386.c
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@ -189,7 +189,7 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
{
SegmentCache *dt;
uint8_t *ptr, *ssp;
int type, dpl, cpl, selector, ss_dpl;
int type, dpl, selector, ss_dpl;
int has_error_code, new_stack, shift;
uint32_t e1, e2, offset, ss, esp, ss_e1, ss_e2, push_size;
uint32_t old_cs, old_ss, old_esp, old_eip;
@ -216,12 +216,8 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
break;
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (env->eflags & VM_MASK)
cpl = 3;
else
cpl = env->segs[R_CS].selector & 3;
/* check privledge if software int */
if (is_int && dpl < cpl)
if (is_int && dpl < env->cpl)
raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
/* check valid bit */
if (!(e2 & DESC_P_MASK))
@ -236,11 +232,11 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl)
if (dpl > env->cpl)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
if (!(e2 & DESC_C_MASK) && dpl < cpl) {
if (!(e2 & DESC_C_MASK) && dpl < env->cpl) {
/* to inner priviledge */
get_ss_esp_from_tss(&ss, &esp, dpl);
if ((ss & 0xfffc) == 0)
@ -259,7 +255,7 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
if (!(ss_e2 & DESC_P_MASK))
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
new_stack = 1;
} else if ((e2 & DESC_C_MASK) || dpl == cpl) {
} else if ((e2 & DESC_C_MASK) || dpl == env->cpl) {
/* to same priviledge */
new_stack = 0;
} else {
@ -406,7 +402,7 @@ void do_interrupt_user(int intno, int is_int, int error_code,
{
SegmentCache *dt;
uint8_t *ptr;
int dpl, cpl;
int dpl;
uint32_t e2;
dt = &env->idt;
@ -414,9 +410,8 @@ void do_interrupt_user(int intno, int is_int, int error_code,
e2 = ldl(ptr + 4);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = 3;
/* check privledge if software int */
if (is_int && dpl < cpl)
if (is_int && dpl < env->cpl)
raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
/* Since we emulate only user space, we cannot do more than
@ -728,6 +723,9 @@ void load_seg(int seg_reg, int selector, unsigned int cur_eip)
selector, (unsigned long)sc->base, sc->limit, sc->flags);
#endif
}
if (seg_reg == R_CS) {
cpu_x86_set_cpl(env, selector & 3);
}
sc->selector = selector;
}
@ -744,7 +742,7 @@ void helper_ljmp_protected_T0_T1(void)
raise_exception_err(EXCP0D_GPF, 0);
if (load_segment(&e1, &e2, new_cs) != 0)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
cpl = env->segs[R_CS].selector & 3;
cpl = env->cpl;
if (e2 & DESC_S_MASK) {
if (!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
@ -828,7 +826,7 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
raise_exception_err(EXCP0D_GPF, 0);
if (load_segment(&e1, &e2, new_cs) != 0)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
cpl = env->segs[R_CS].selector & 3;
cpl = env->cpl;
if (e2 & DESC_S_MASK) {
if (!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
@ -1081,7 +1079,7 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
if (!(e2 & DESC_S_MASK) ||
!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
cpl = env->segs[R_CS].selector & 3;
cpl = env->cpl;
rpl = new_cs & 3;
if (rpl < cpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
@ -1158,12 +1156,13 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
/* modify processor state */
load_eflags(new_eflags, FL_UPDATE_CPL0_MASK | VM_MASK | VIF_MASK | VIP_MASK);
load_seg_vm(R_CS, new_cs);
cpu_x86_set_cpl(env, 3);
load_seg_vm(R_SS, new_ss);
load_seg_vm(R_ES, new_es);
load_seg_vm(R_DS, new_ds);
load_seg_vm(R_FS, new_fs);
load_seg_vm(R_GS, new_gs);
env->eip = new_eip;
env->regs[R_ESP] = new_esp;
}