mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

correct NT flag behavior - zero ldt task switch bug fix - task switch thru call insn bug fix

Browse Source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@586 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-01-24 16:27:56 +00:00
parent 7399c5a9be
commit 8145122b08
1 changed files with 47 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
target-i386/helper.c
View File

@ -21,6 +21,14 @@
//#define DEBUG_PCALL
#if 0
#define raise_exception_err(a, b)\
do {\
printf("raise_exception line=%d\n", __LINE__);\
(raise_exception_err)(a, b);\
} while (0)
#endif
const uint8_t parity_table[256] = {
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
@ -424,7 +432,7 @@ static void switch_tss(int tss_selector,
possible exception */
env->eip = new_eip;
eflags_mask = TF_MASK | AC_MASK | ID_MASK |
IF_MASK | IOPL_MASK | VM_MASK | RF_MASK;
IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK;
if (!(type & 8))
eflags_mask &= 0xffff;
load_eflags(new_eflags, eflags_mask);
@ -452,18 +460,20 @@ static void switch_tss(int tss_selector,
if (new_ldt & 4)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
dt = &env->gdt;
index = new_ldt & ~7;
if ((index + 7) > dt->limit)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
ptr = dt->base + index;
e1 = ldl_kernel(ptr);
e2 = ldl_kernel(ptr + 4);
if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
load_seg_cache_raw_dt(&env->ldt, e1, e2);
if ((new_ldt & 0xfffc) != 0) {
dt = &env->gdt;
index = new_ldt & ~7;
if ((index + 7) > dt->limit)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
ptr = dt->base + index;
e1 = ldl_kernel(ptr);
e2 = ldl_kernel(ptr + 4);
if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
load_seg_cache_raw_dt(&env->ldt, e1, e2);
}
/* load the segments */
if (!(new_eflags & VM_MASK)) {
@ -748,6 +758,7 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
if (env->eflags & VM_MASK) {
/* XXX: explain me why W2K hangs if the whole segment cache is
reset ? */
#if 1
env->segs[R_ES].selector = 0;
env->segs[R_ES].flags = 0;
env->segs[R_DS].selector = 0;
@ -756,6 +767,12 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
env->segs[R_FS].flags = 0;
env->segs[R_GS].selector = 0;
env->segs[R_GS].flags = 0;
#else
cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0, 0);
cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0, 0);
cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0, 0);
cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0, 0);
#endif
}
ss = (ss & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_SS, ss,
@ -853,13 +870,19 @@ void do_interrupt(int intno, int is_int, int error_code,
{
extern FILE *stdout;
static int count;
if ((env->cr[0] && CR0_PE_MASK)) {
fprintf(stdout, "%d: interrupt: vector=%02x error_code=%04x int=%d CPL=%d CS:EIP=%04x:%08x SS:ESP=%04x:%08x EAX=%08x\n",
if (env->cr[0] & CR0_PE_MASK) {
fprintf(stdout, "%d: v=%02x e=%04x i=%d CPL=%d CS:EIP=%04x:%08x SS:ESP=%04x:%08x",
count, intno, error_code, is_int,
env->hflags & HF_CPL_MASK,
env->segs[R_CS].selector, EIP,
env->segs[R_SS].selector, ESP,
EAX);
env->segs[R_SS].selector, ESP);
if (intno == 0x0e) {
fprintf(stdout, " CR2=%08x", env->cr[2]);
} else {
fprintf(stdout, " EAX=%08x", env->regs[R_EAX]);
}
fprintf(stdout, "\n");
if (0) {
cpu_x86_dump_state(env, stdout, X86_DUMP_CCOP);
#if 0
@ -879,7 +902,6 @@ void do_interrupt(int intno, int is_int, int error_code,
}
}
#endif
#ifdef DEBUG_PCALL
if (loglevel) {
static int count;
@ -925,7 +947,8 @@ void raise_interrupt(int intno, int is_int, int error_code,
}
/* shortcuts to generate exceptions */
void raise_exception_err(int exception_index, int error_code)
void (raise_exception_err)(int exception_index, int error_code)
{
raise_interrupt(exception_index, 0, error_code, 0);
}
@ -1409,7 +1432,7 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
if (dpl < cpl || dpl < rpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
switch_tss(new_cs, e1, e2, SWITCH_TSS_CALL);
break;
return;
case 4: /* 286 call gate */
case 12: /* 386 call gate */
break;
@ -1551,9 +1574,9 @@ void helper_iret_real(int shift)
load_seg_vm(R_CS, new_cs);
env->eip = new_eip;
if (env->eflags & VM_MASK)
eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK;
eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | NT_MASK;
else
eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | RF_MASK;
eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | RF_MASK | NT_MASK;
if (shift == 0)
eflags_mask &= 0xffff;
load_eflags(new_eflags, eflags_mask);
@ -1688,7 +1711,7 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
env->eip = new_eip;
if (is_iret) {
/* NOTE: 'cpl' is the _old_ CPL */
eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK;
eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK;
if (cpl == 0)
eflags_mask |= IOPL_MASK;
iopl = (env->eflags >> IOPL_SHIFT) & 3;
@ -1710,7 +1733,7 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
/* modify processor state */
load_eflags(new_eflags, TF_MASK | AC_MASK | ID_MASK |
IF_MASK | IOPL_MASK | VM_MASK | VIF_MASK | VIP_MASK);
IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK | VIP_MASK);
load_seg_vm(R_CS, new_cs & 0xffff);
cpu_x86_set_cpl(env, 3);
load_seg_vm(R_SS, new_ss & 0xffff);