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-rw-r--r--helper-i386.c184
1 files changed, 168 insertions, 16 deletions
diff --git a/helper-i386.c b/helper-i386.c
index 1182be8ce7..66121ff966 100644
--- a/helper-i386.c
+++ b/helper-i386.c
@@ -157,7 +157,7 @@ void raise_interrupt(int intno, int is_int, int error_code,
break;
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
- cpl = env->segs[R_CS] & 3;
+ cpl = env->segs[R_CS].selector & 3;
/* check privledge if software int */
if (is_int && dpl < cpl)
raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
@@ -176,7 +176,7 @@ void raise_interrupt(int intno, int is_int, int error_code,
void raise_interrupt(int intno, int is_int, int error_code,
unsigned int next_eip)
{
- SegmentDescriptorTable *dt;
+ SegmentCache *dt;
uint8_t *ptr;
int dpl, cpl;
uint32_t e2;
@@ -331,21 +331,98 @@ void helper_cpuid(void)
}
}
+static inline void load_seg_cache(SegmentCache *sc, uint32_t e1, uint32_t e2)
+{
+ sc->base = (void *)((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
+ sc->limit = (e1 & 0xffff) | (e2 & 0x000f0000);
+ if (e2 & (1 << 23))
+ sc->limit = (sc->limit << 12) | 0xfff;
+ sc->seg_32bit = (e2 >> 22) & 1;
+}
+
+void helper_lldt_T0(void)
+{
+ int selector;
+ SegmentCache *dt;
+ uint32_t e1, e2;
+ int index;
+ uint8_t *ptr;
+
+ selector = T0 & 0xffff;
+ if ((selector & 0xfffc) == 0) {
+ /* XXX: NULL selector case: invalid LDT */
+ env->ldt.base = NULL;
+ env->ldt.limit = 0;
+ } else {
+ if (selector & 0x4)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ dt = &env->gdt;
+ index = selector & ~7;
+ if ((index + 7) > dt->limit)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ ptr = dt->base + index;
+ e1 = ldl(ptr);
+ e2 = ldl(ptr + 4);
+ if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
+ load_seg_cache(&env->ldt, e1, e2);
+ }
+ env->ldt.selector = selector;
+}
+
+void helper_ltr_T0(void)
+{
+ int selector;
+ SegmentCache *dt;
+ uint32_t e1, e2;
+ int index, type;
+ uint8_t *ptr;
+
+ selector = T0 & 0xffff;
+ if ((selector & 0xfffc) == 0) {
+ /* XXX: NULL selector case: invalid LDT */
+ env->tr.base = NULL;
+ env->tr.limit = 0;
+ } else {
+ if (selector & 0x4)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ dt = &env->gdt;
+ index = selector & ~7;
+ if ((index + 7) > dt->limit)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ ptr = dt->base + index;
+ e1 = ldl(ptr);
+ e2 = ldl(ptr + 4);
+ type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
+ if ((e2 & DESC_S_MASK) ||
+ (type != 2 && type != 9))
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
+ load_seg_cache(&env->tr, e1, e2);
+ e2 |= 0x00000200; /* set the busy bit */
+ stl(ptr + 4, e2);
+ }
+ env->tr.selector = selector;
+}
+
/* only works if protected mode and not VM86 */
-void load_seg(int seg_reg, int selector, unsigned cur_eip)
+void load_seg(int seg_reg, int selector, unsigned int cur_eip)
{
SegmentCache *sc;
- SegmentDescriptorTable *dt;
+ SegmentCache *dt;
int index;
uint32_t e1, e2;
uint8_t *ptr;
-
- sc = &env->seg_cache[seg_reg];
+
+ sc = &env->segs[seg_reg];
if ((selector & 0xfffc) == 0) {
/* null selector case */
if (seg_reg == R_SS) {
EIP = cur_eip;
- raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ raise_exception_err(EXCP0D_GPF, 0);
} else {
/* XXX: each access should trigger an exception */
sc->base = NULL;
@@ -390,18 +467,93 @@ void load_seg(int seg_reg, int selector, unsigned cur_eip)
else
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
}
-
- sc->base = (void *)((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
- sc->limit = (e1 & 0xffff) | (e2 & 0x000f0000);
- if (e2 & (1 << 23))
- sc->limit = (sc->limit << 12) | 0xfff;
- sc->seg_32bit = (e2 >> 22) & 1;
+ load_seg_cache(sc, e1, e2);
#if 0
fprintf(logfile, "load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx seg_32bit=%d\n",
selector, (unsigned long)sc->base, sc->limit, sc->seg_32bit);
#endif
}
- env->segs[seg_reg] = selector;
+ sc->selector = selector;
+}
+
+/* protected mode jump */
+void jmp_seg(int selector, unsigned int new_eip)
+{
+ SegmentCache sc1;
+ SegmentCache *dt;
+ int index;
+ uint32_t e1, e2, cpl, dpl, rpl;
+ uint8_t *ptr;
+
+ if ((selector & 0xfffc) == 0) {
+ raise_exception_err(EXCP0D_GPF, 0);
+ }
+
+ if (selector & 0x4)
+ dt = &env->ldt;
+ else
+ dt = &env->gdt;
+ index = selector & ~7;
+ if ((index + 7) > dt->limit)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ ptr = dt->base + index;
+ e1 = ldl(ptr);
+ e2 = ldl(ptr + 4);
+ cpl = env->segs[R_CS].selector & 3;
+ if (e2 & DESC_S_MASK) {
+ if (!(e2 & DESC_CS_MASK))
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ dpl = (e2 >> DESC_DPL_SHIFT) & 3;
+ if (e2 & DESC_CS_MASK) {
+ /* conforming code segment */
+ if (dpl > cpl)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ } else {
+ /* non conforming code segment */
+ rpl = selector & 3;
+ if (rpl > cpl)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ if (dpl != cpl)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ }
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
+ load_seg_cache(&sc1, e1, e2);
+ if (new_eip > sc1.limit)
+ raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
+ env->segs[R_CS] = sc1;
+ env->segs[R_CS].selector = (selector & 0xfffc) | cpl;
+ EIP = new_eip;
+ } else {
+ cpu_abort(env, "jmp to call/task gate not supported 0x%04x:0x%08x",
+ selector, new_eip);
+ }
+}
+
+/* XXX: do more */
+void helper_movl_crN_T0(int reg)
+{
+ switch(reg) {
+ case 0:
+ default:
+ env->cr[0] = reg;
+ break;
+ case 2:
+ env->cr[2] = reg;
+ break;
+ case 3:
+ env->cr[3] = reg;
+ break;
+ case 4:
+ env->cr[4] = reg;
+ break;
+ }
+}
+
+/* XXX: do more */
+void helper_movl_drN_T0(int reg)
+{
+ env->dr[reg] = T0;
}
/* rdtsc */
@@ -425,7 +577,7 @@ void helper_rdtsc(void)
void helper_lsl(void)
{
unsigned int selector, limit;
- SegmentDescriptorTable *dt;
+ SegmentCache *dt;
int index;
uint32_t e1, e2;
uint8_t *ptr;
@@ -452,7 +604,7 @@ void helper_lsl(void)
void helper_lar(void)
{
unsigned int selector;
- SegmentDescriptorTable *dt;
+ SegmentCache *dt;
int index;
uint32_t e2;
uint8_t *ptr;
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-29 10:59:26 +0000