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-rw-r--r--target-i386/helper.c525
1 files changed, 465 insertions, 60 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 1c0920bcf8..2f4a15d873 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -126,6 +126,56 @@ void cpu_loop_exit(void)
longjmp(env->jmp_env, 1);
}
+/* return non zero if error */
+static inline int load_segment(uint32_t *e1_ptr, uint32_t *e2_ptr,
+ int selector)
+{
+ SegmentCache *dt;
+ int index;
+ uint8_t *ptr;
+
+ if (selector & 0x4)
+ dt = &env->ldt;
+ else
+ dt = &env->gdt;
+ index = selector & ~7;
+ if ((index + 7) > dt->limit)
+ return -1;
+ ptr = dt->base + index;
+ *e1_ptr = ldl_kernel(ptr);
+ *e2_ptr = ldl_kernel(ptr + 4);
+ return 0;
+}
+
+static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
+{
+ unsigned int limit;
+ limit = (e1 & 0xffff) | (e2 & 0x000f0000);
+ if (e2 & DESC_G_MASK)
+ limit = (limit << 12) | 0xfff;
+ return limit;
+}
+
+static inline uint8_t *get_seg_base(uint32_t e1, uint32_t e2)
+{
+ return (uint8_t *)((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
+}
+
+static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1, uint32_t e2)
+{
+ sc->base = get_seg_base(e1, e2);
+ sc->limit = get_seg_limit(e1, e2);
+ sc->flags = e2;
+}
+
+/* init the segment cache in vm86 mode. */
+static inline void load_seg_vm(int seg, int selector)
+{
+ selector &= 0xffff;
+ cpu_x86_load_seg_cache(env, seg, selector,
+ (uint8_t *)(selector << 4), 0xffff, 0);
+}
+
static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
uint32_t *esp_ptr, int dpl)
{
@@ -161,54 +211,322 @@ static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
}
}
-/* return non zero if error */
-static inline int load_segment(uint32_t *e1_ptr, uint32_t *e2_ptr,
- int selector)
+/* XXX: merge with load_seg() */
+static void tss_load_seg(int seg_reg, int selector)
{
+ uint32_t e1, e2;
+ int rpl, dpl, cpl;
+
+ if ((selector & 0xfffc) != 0) {
+ if (load_segment(&e1, &e2, selector) != 0)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ if (!(e2 & DESC_S_MASK))
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ rpl = selector & 3;
+ dpl = (e2 >> DESC_DPL_SHIFT) & 3;
+ cpl = env->hflags & HF_CPL_MASK;
+ if (seg_reg == R_CS) {
+ if (!(e2 & DESC_CS_MASK))
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ if (dpl != rpl)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ if ((e2 & DESC_C_MASK) && dpl > rpl)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+
+ } else if (seg_reg == R_SS) {
+ /* SS must be writable data */
+ if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ if (dpl != cpl || dpl != rpl)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ } else {
+ /* not readable code */
+ if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK))
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ /* if data or non conforming code, checks the rights */
+ if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
+ if (dpl < cpl || dpl < rpl)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ }
+ }
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
+ cpu_x86_load_seg_cache(env, seg_reg, selector,
+ get_seg_base(e1, e2),
+ get_seg_limit(e1, e2),
+ e2);
+ } else {
+ if (seg_reg == R_SS || seg_reg == R_CS)
+ raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
+ }
+}
+
+#define SWITCH_TSS_JMP 0
+#define SWITCH_TSS_IRET 1
+#define SWITCH_TSS_CALL 2
+
+/* XXX: restore CPU state in registers (PowerPC case) */
+static void switch_tss(int tss_selector,
+ uint32_t e1, uint32_t e2, int source)
+{
+ int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i;
+ uint8_t *tss_base;
+ uint32_t new_regs[8], new_segs[6];
+ uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap;
+ uint32_t old_eflags, eflags_mask;
SegmentCache *dt;
int index;
uint8_t *ptr;
- if (selector & 0x4)
- dt = &env->ldt;
+ type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
+
+ /* if task gate, we read the TSS segment and we load it */
+ if (type == 5) {
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
+ tss_selector = e1 >> 16;
+ if (tss_selector & 4)
+ raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
+ if (load_segment(&e1, &e2, tss_selector) != 0)
+ raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
+ if (e2 & DESC_S_MASK)
+ raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
+ type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
+ if ((type & 7) != 1)
+ raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
+ }
+
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
+
+ if (type & 8)
+ tss_limit_max = 103;
else
- dt = &env->gdt;
- index = selector & ~7;
+ tss_limit_max = 43;
+ tss_limit = get_seg_limit(e1, e2);
+ tss_base = get_seg_base(e1, e2);
+ if ((tss_selector & 4) != 0 ||
+ tss_limit < tss_limit_max)
+ raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
+ old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
+ if (old_type & 8)
+ old_tss_limit_max = 103;
+ else
+ old_tss_limit_max = 43;
+
+ /* read all the registers from the new TSS */
+ if (type & 8) {
+ /* 32 bit */
+ new_cr3 = ldl_kernel(tss_base + 0x1c);
+ new_eip = ldl_kernel(tss_base + 0x20);
+ new_eflags = ldl_kernel(tss_base + 0x24);
+ for(i = 0; i < 8; i++)
+ new_regs[i] = ldl_kernel(tss_base + (0x28 + i * 4));
+ for(i = 0; i < 6; i++)
+ new_segs[i] = lduw_kernel(tss_base + (0x48 + i * 4));
+ new_ldt = lduw_kernel(tss_base + 0x60);
+ new_trap = ldl_kernel(tss_base + 0x64);
+ } else {
+ /* 16 bit */
+ new_cr3 = 0;
+ new_eip = lduw_kernel(tss_base + 0x0e);
+ new_eflags = lduw_kernel(tss_base + 0x10);
+ for(i = 0; i < 8; i++)
+ new_regs[i] = lduw_kernel(tss_base + (0x12 + i * 2)) | 0xffff0000;
+ for(i = 0; i < 4; i++)
+ new_segs[i] = lduw_kernel(tss_base + (0x22 + i * 4));
+ new_ldt = lduw_kernel(tss_base + 0x2a);
+ new_segs[R_FS] = 0;
+ new_segs[R_GS] = 0;
+ new_trap = 0;
+ }
+
+ /* NOTE: we must avoid memory exceptions during the task switch,
+ so we make dummy accesses before */
+ /* XXX: it can still fail in some cases, so a bigger hack is
+ necessary to valid the TLB after having done the accesses */
+
+ v1 = ldub_kernel(env->tr.base);
+ v2 = ldub(env->tr.base + old_tss_limit_max);
+ stb_kernel(env->tr.base, v1);
+ stb_kernel(env->tr.base + old_tss_limit_max, v2);
+
+ /* clear busy bit (it is restartable) */
+ if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
+ uint8_t *ptr;
+ uint32_t e2;
+ ptr = env->gdt.base + (env->tr.selector << 3);
+ e2 = ldl_kernel(ptr + 4);
+ e2 &= ~DESC_TSS_BUSY_MASK;
+ stl_kernel(ptr + 4, e2);
+ }
+ old_eflags = compute_eflags();
+ if (source == SWITCH_TSS_IRET)
+ old_eflags &= ~NT_MASK;
+
+ /* save the current state in the old TSS */
+ if (type & 8) {
+ /* 32 bit */
+ stl_kernel(env->tr.base + 0x20, env->eip);
+ stl_kernel(env->tr.base + 0x24, old_eflags);
+ for(i = 0; i < 8; i++)
+ stl_kernel(env->tr.base + (0x28 + i * 4), env->regs[i]);
+ for(i = 0; i < 6; i++)
+ stw_kernel(env->tr.base + (0x48 + i * 4), env->segs[i].selector);
+ } else {
+ /* 16 bit */
+ stw_kernel(env->tr.base + 0x0e, new_eip);
+ stw_kernel(env->tr.base + 0x10, old_eflags);
+ for(i = 0; i < 8; i++)
+ stw_kernel(env->tr.base + (0x12 + i * 2), env->regs[i]);
+ for(i = 0; i < 4; i++)
+ stw_kernel(env->tr.base + (0x22 + i * 4), env->segs[i].selector);
+ }
+
+ /* now if an exception occurs, it will occurs in the next task
+ context */
+
+ if (source == SWITCH_TSS_CALL) {
+ stw_kernel(tss_base, env->tr.selector);
+ new_eflags |= NT_MASK;
+ }
+
+ /* set busy bit */
+ if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
+ uint8_t *ptr;
+ uint32_t e2;
+ ptr = env->gdt.base + (tss_selector << 3);
+ e2 = ldl_kernel(ptr + 4);
+ e2 |= DESC_TSS_BUSY_MASK;
+ stl_kernel(ptr + 4, e2);
+ }
+
+ /* set the new CPU state */
+ /* from this point, any exception which occurs can give problems */
+ env->cr[0] |= CR0_TS_MASK;
+ env->tr.selector = tss_selector;
+ env->tr.base = tss_base;
+ env->tr.limit = tss_limit;
+ env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK;
+
+ if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) {
+ env->cr[3] = new_cr3;
+ cpu_x86_update_cr3(env);
+ }
+
+ /* load all registers without an exception, then reload them with
+ possible exception */
+ env->eip = new_eip;
+ eflags_mask = FL_UPDATE_CPL0_MASK;
+ if (!(type & 8))
+ eflags_mask &= 0xffff;
+ load_eflags(new_eflags, eflags_mask);
+ for(i = 0; i < 8; i++)
+ env->regs[i] = new_regs[i];
+ if (new_eflags & VM_MASK) {
+ for(i = 0; i < 6; i++)
+ load_seg_vm(i, new_segs[i]);
+ /* in vm86, CPL is always 3 */
+ cpu_x86_set_cpl(env, 3);
+ } else {
+ /* CPL is set the RPL of CS */
+ cpu_x86_set_cpl(env, new_segs[R_CS] & 3);
+ /* first just selectors as the rest may trigger exceptions */
+ for(i = 0; i < 6; i++)
+ cpu_x86_load_seg_cache(env, i, new_segs[i], NULL, 0, 0);
+ }
+
+ env->ldt.selector = new_ldt & ~4;
+ env->ldt.base = NULL;
+ env->ldt.limit = 0;
+ env->ldt.flags = 0;
+
+ /* load the LDT */
+ if (new_ldt & 4)
+ raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
+
+ dt = &env->gdt;
+ index = new_ldt & ~7;
if ((index + 7) > dt->limit)
- return -1;
+ raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
ptr = dt->base + index;
- *e1_ptr = ldl_kernel(ptr);
- *e2_ptr = ldl_kernel(ptr + 4);
- return 0;
+ 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)) {
+ tss_load_seg(R_CS, new_segs[R_CS]);
+ tss_load_seg(R_SS, new_segs[R_SS]);
+ tss_load_seg(R_ES, new_segs[R_ES]);
+ tss_load_seg(R_DS, new_segs[R_DS]);
+ tss_load_seg(R_FS, new_segs[R_FS]);
+ tss_load_seg(R_GS, new_segs[R_GS]);
+ }
+
+ /* check that EIP is in the CS segment limits */
+ if (new_eip > env->segs[R_CS].limit) {
+ raise_exception_err(EXCP0D_GPF, 0);
+ }
}
-
-static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
+
+/* check if Port I/O is allowed in TSS */
+static inline void check_io(int addr, int size)
{
- unsigned int limit;
- limit = (e1 & 0xffff) | (e2 & 0x000f0000);
- if (e2 & DESC_G_MASK)
- limit = (limit << 12) | 0xfff;
- return limit;
+ int 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 = lduw_kernel(env->tr.base + 0x66);
+ io_offset += (addr >> 3);
+ /* Note: the check needs two bytes */
+ if ((io_offset + 1) > env->tr.limit)
+ goto fail;
+ val = lduw_kernel(env->tr.base + io_offset);
+ 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(EXCP0D_GPF, 0);
+ }
}
-static inline uint8_t *get_seg_base(uint32_t e1, uint32_t e2)
+void check_iob_T0(void)
{
- return (uint8_t *)((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
+ check_io(T0, 1);
}
-static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1, uint32_t e2)
+void check_iow_T0(void)
{
- sc->base = get_seg_base(e1, e2);
- sc->limit = get_seg_limit(e1, e2);
- sc->flags = e2;
+ check_io(T0, 2);
}
-/* init the segment cache in vm86 mode. */
-static inline void load_seg_vm(int seg, int selector)
+void check_iol_T0(void)
{
- selector &= 0xffff;
- cpu_x86_load_seg_cache(env, seg, selector,
- (uint8_t *)(selector << 4), 0xffff, 0);
+ check_io(T0, 4);
+}
+
+void check_iob_DX(void)
+{
+ check_io(EDX & 0xffff, 1);
+}
+
+void check_iow_DX(void)
+{
+ check_io(EDX & 0xffff, 2);
+}
+
+void check_iol_DX(void)
+{
+ check_io(EDX & 0xffff, 4);
}
/* protected mode interrupt */
@@ -222,6 +540,21 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
uint32_t e1, e2, offset, ss, esp, ss_e1, ss_e2, push_size;
uint32_t old_cs, old_ss, old_esp, old_eip;
+ has_error_code = 0;
+ if (!is_int && !is_hw) {
+ switch(intno) {
+ case 8:
+ case 10:
+ case 11:
+ case 12:
+ case 13:
+ case 14:
+ case 17:
+ has_error_code = 1;
+ break;
+ }
+ }
+
dt = &env->idt;
if (intno * 8 + 7 > dt->limit)
raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
@@ -232,8 +565,27 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
switch(type) {
case 5: /* task gate */
- cpu_abort(env, "task gate not supported");
- break;
+ /* must do that check here to return the correct error code */
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2);
+ switch_tss(intno * 8, e1, e2, SWITCH_TSS_CALL);
+ if (has_error_code) {
+ int mask;
+ /* push the error code */
+ shift = (env->segs[R_CS].flags >> DESC_B_SHIFT) & 1;
+ if (env->segs[R_SS].flags & DESC_B_MASK)
+ mask = 0xffffffff;
+ else
+ mask = 0xffff;
+ esp = (env->regs[R_ESP] - (2 << shift)) & mask;
+ ssp = env->segs[R_SS].base + esp;
+ if (shift)
+ stl_kernel(ssp, error_code);
+ else
+ stw_kernel(ssp, error_code);
+ env->regs[R_ESP] = (esp & mask) | (env->regs[R_ESP] & ~mask);
+ }
+ return;
case 6: /* 286 interrupt gate */
case 7: /* 286 trap gate */
case 14: /* 386 interrupt gate */
@@ -293,20 +645,6 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
}
shift = type >> 3;
- has_error_code = 0;
- if (!is_int && !is_hw) {
- switch(intno) {
- case 8:
- case 10:
- case 11:
- case 12:
- case 13:
- case 14:
- case 17:
- has_error_code = 1;
- break;
- }
- }
push_size = 6 + (new_stack << 2) + (has_error_code << 1);
if (env->eflags & VM_MASK)
push_size += 8;
@@ -688,7 +1026,7 @@ void helper_ltr_T0(void)
e2 = ldl_kernel(ptr + 4);
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
if ((e2 & DESC_S_MASK) ||
- (type != 2 && type != 9))
+ (type != 1 && type != 9))
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
@@ -701,6 +1039,7 @@ void helper_ltr_T0(void)
/* only works if protected mode and not VM86. Calling load_seg with
seg_reg == R_CS is discouraged */
+/* XXX: add ring level checks */
void load_seg(int seg_reg, int selector, unsigned int cur_eip)
{
uint32_t e1, e2;
@@ -725,7 +1064,7 @@ void load_seg(int seg_reg, int selector, unsigned int cur_eip)
}
if (seg_reg == R_SS) {
- if ((e2 & (DESC_CS_MASK | DESC_W_MASK)) == 0) {
+ if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
EIP = cur_eip;
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
}
@@ -757,7 +1096,7 @@ void load_seg(int seg_reg, int selector, unsigned int cur_eip)
/* protected mode jump */
void helper_ljmp_protected_T0_T1(void)
{
- int new_cs, new_eip;
+ int new_cs, new_eip, gate_cs, type;
uint32_t e1, e2, cpl, dpl, rpl, limit;
new_cs = T0;
@@ -771,7 +1110,7 @@ void helper_ljmp_protected_T0_T1(void)
if (!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
- if (e2 & DESC_CS_MASK) {
+ if (e2 & DESC_C_MASK) {
/* conforming code segment */
if (dpl > cpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
@@ -792,8 +1131,52 @@ void helper_ljmp_protected_T0_T1(void)
get_seg_base(e1, e2), limit, e2);
EIP = new_eip;
} else {
- cpu_abort(env, "jmp to call/task gate not supported 0x%04x:0x%08x",
- new_cs, new_eip);
+ /* jump to call or task gate */
+ dpl = (e2 >> DESC_DPL_SHIFT) & 3;
+ rpl = new_cs & 3;
+ cpl = env->hflags & HF_CPL_MASK;
+ type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
+ switch(type) {
+ case 1: /* 286 TSS */
+ case 9: /* 386 TSS */
+ case 5: /* task gate */
+ if (dpl < cpl || dpl < rpl)
+ raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
+ switch_tss(new_cs, e1, e2, SWITCH_TSS_JMP);
+ break;
+ case 4: /* 286 call gate */
+ case 12: /* 386 call gate */
+ if ((dpl < cpl) || (dpl < rpl))
+ raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc);
+ gate_cs = e1 >> 16;
+ if (load_segment(&e1, &e2, gate_cs) != 0)
+ raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
+ dpl = (e2 >> DESC_DPL_SHIFT) & 3;
+ /* must be code segment */
+ if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) !=
+ (DESC_S_MASK | DESC_CS_MASK)))
+ raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
+ if (((e2 & DESC_C_MASK) && (dpl > cpl)) ||
+ (!(e2 & DESC_C_MASK) && (dpl != cpl)))
+ raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
+ if (!(e2 & DESC_P_MASK))
+ raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
+ new_eip = (e1 & 0xffff);
+ if (type == 12)
+ new_eip |= (e2 & 0xffff0000);
+ limit = get_seg_limit(e1, e2);
+ if (new_eip > limit)
+ raise_exception_err(EXCP0D_GPF, 0);
+ cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl,
+ get_seg_base(e1, e2), limit, e2);
+ EIP = new_eip;
+ break;
+ default:
+ raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
+ break;
+ }
}
}
@@ -852,7 +1235,7 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
if (!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
- if (e2 & DESC_CS_MASK) {
+ if (e2 & DESC_C_MASK) {
/* conforming code segment */
if (dpl > cpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
@@ -898,11 +1281,15 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
} else {
/* check gate type */
type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
+ dpl = (e2 >> DESC_DPL_SHIFT) & 3;
+ rpl = new_cs & 3;
switch(type) {
case 1: /* available 286 TSS */
case 9: /* available 386 TSS */
case 5: /* task gate */
- cpu_abort(env, "task gate not supported");
+ if (dpl < cpl || dpl < rpl)
+ raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
+ switch_tss(new_cs, e1, e2, SWITCH_TSS_CALL);
break;
case 4: /* 286 call gate */
case 12: /* 386 call gate */
@@ -913,8 +1300,6 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
}
shift = type >> 3;
- dpl = (e2 >> DESC_DPL_SHIFT) & 3;
- rpl = new_cs & 3;
if (dpl < cpl || dpl < rpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
/* check valid bit */
@@ -1031,13 +1416,13 @@ void helper_lcall_protected_T0_T1(int shift, int next_eip)
}
}
-/* real mode iret */
+/* real and vm86 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 = ESP & 0xffff;
ssp = env->segs[R_SS].base + sp;
if (shift == 1) {
@@ -1056,7 +1441,10 @@ void helper_iret_real(int shift)
(new_esp & 0xffff);
load_seg_vm(R_CS, new_cs);
env->eip = new_eip;
- eflags_mask = FL_UPDATE_CPL0_MASK;
+ if (env->eflags & VM_MASK)
+ eflags_mask = FL_UPDATE_MASK32 | IF_MASK | RF_MASK;
+ else
+ eflags_mask = FL_UPDATE_CPL0_MASK;
if (shift == 0)
eflags_mask &= 0xffff;
load_eflags(new_eflags, eflags_mask);
@@ -1102,7 +1490,7 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
if (rpl < cpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
- if (e2 & DESC_CS_MASK) {
+ if (e2 & DESC_C_MASK) {
if (dpl > rpl)
raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
} else {
@@ -1198,7 +1586,24 @@ static inline void helper_ret_protected(int shift, int is_iret, int addend)
void helper_iret_protected(int shift)
{
- helper_ret_protected(shift, 1, 0);
+ int tss_selector, type;
+ uint32_t e1, e2;
+
+ /* specific case for TSS */
+ if (env->eflags & NT_MASK) {
+ tss_selector = lduw_kernel(env->tr.base + 0);
+ if (tss_selector & 4)
+ raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
+ if (load_segment(&e1, &e2, tss_selector) != 0)
+ raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
+ type = (e2 >> DESC_TYPE_SHIFT) & 0x17;
+ /* NOTE: we check both segment and busy TSS */
+ if (type != 3)
+ raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
+ switch_tss(tss_selector, e1, e2, SWITCH_TSS_IRET);
+ } else {
+ helper_ret_protected(shift, 1, 0);
+ }
}
void helper_lret_protected(int shift, int addend)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-27 03:13:47 +0000