mirror of
https://github.com/qemu/qemu.git
synced 2024-11-27 05:43:47 +08:00
full TSS support - IO map check support - conforming segment check fixes - iret in vm86 mode fix
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@450 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
e670b89e3b
commit
7e84c2498f
@ -126,41 +126,6 @@ void cpu_loop_exit(void)
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longjmp(env->jmp_env, 1);
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}
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static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
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uint32_t *esp_ptr, int dpl)
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{
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int type, index, shift;
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#if 0
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{
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int i;
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printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit);
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for(i=0;i<env->tr.limit;i++) {
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printf("%02x ", env->tr.base[i]);
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if ((i & 7) == 7) printf("\n");
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}
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printf("\n");
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}
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#endif
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if (!(env->tr.flags & DESC_P_MASK))
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cpu_abort(env, "invalid tss");
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type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
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if ((type & 7) != 1)
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cpu_abort(env, "invalid tss type");
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shift = type >> 3;
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index = (dpl * 4 + 2) << shift;
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if (index + (4 << shift) - 1 > env->tr.limit)
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raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
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if (shift == 0) {
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*esp_ptr = lduw_kernel(env->tr.base + index);
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*ss_ptr = lduw_kernel(env->tr.base + index + 2);
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} else {
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*esp_ptr = ldl_kernel(env->tr.base + index);
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*ss_ptr = lduw_kernel(env->tr.base + index + 4);
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}
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}
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/* return non zero if error */
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static inline int load_segment(uint32_t *e1_ptr, uint32_t *e2_ptr,
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int selector)
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@ -211,6 +176,359 @@ static inline void load_seg_vm(int seg, int selector)
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(uint8_t *)(selector << 4), 0xffff, 0);
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}
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static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
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uint32_t *esp_ptr, int dpl)
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{
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int type, index, shift;
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#if 0
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{
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int i;
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printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit);
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for(i=0;i<env->tr.limit;i++) {
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printf("%02x ", env->tr.base[i]);
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if ((i & 7) == 7) printf("\n");
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}
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printf("\n");
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}
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#endif
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if (!(env->tr.flags & DESC_P_MASK))
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cpu_abort(env, "invalid tss");
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type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
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if ((type & 7) != 1)
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cpu_abort(env, "invalid tss type");
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shift = type >> 3;
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index = (dpl * 4 + 2) << shift;
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if (index + (4 << shift) - 1 > env->tr.limit)
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raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
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if (shift == 0) {
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*esp_ptr = lduw_kernel(env->tr.base + index);
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*ss_ptr = lduw_kernel(env->tr.base + index + 2);
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} else {
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*esp_ptr = ldl_kernel(env->tr.base + index);
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*ss_ptr = lduw_kernel(env->tr.base + index + 4);
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}
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}
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/* XXX: merge with load_seg() */
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static void tss_load_seg(int seg_reg, int selector)
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{
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uint32_t e1, e2;
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int rpl, dpl, cpl;
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if ((selector & 0xfffc) != 0) {
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if (load_segment(&e1, &e2, selector) != 0)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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if (!(e2 & DESC_S_MASK))
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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rpl = selector & 3;
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dpl = (e2 >> DESC_DPL_SHIFT) & 3;
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cpl = env->hflags & HF_CPL_MASK;
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if (seg_reg == R_CS) {
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if (!(e2 & DESC_CS_MASK))
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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if (dpl != rpl)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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if ((e2 & DESC_C_MASK) && dpl > rpl)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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} else if (seg_reg == R_SS) {
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/* SS must be writable data */
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if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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if (dpl != cpl || dpl != rpl)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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} else {
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/* not readable code */
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if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK))
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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/* if data or non conforming code, checks the rights */
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if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
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if (dpl < cpl || dpl < rpl)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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}
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}
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if (!(e2 & DESC_P_MASK))
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raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
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cpu_x86_load_seg_cache(env, seg_reg, selector,
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get_seg_base(e1, e2),
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get_seg_limit(e1, e2),
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e2);
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} else {
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if (seg_reg == R_SS || seg_reg == R_CS)
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raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
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}
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}
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#define SWITCH_TSS_JMP 0
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#define SWITCH_TSS_IRET 1
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#define SWITCH_TSS_CALL 2
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/* XXX: restore CPU state in registers (PowerPC case) */
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static void switch_tss(int tss_selector,
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uint32_t e1, uint32_t e2, int source)
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{
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int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i;
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uint8_t *tss_base;
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uint32_t new_regs[8], new_segs[6];
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uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap;
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uint32_t old_eflags, eflags_mask;
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SegmentCache *dt;
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int index;
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uint8_t *ptr;
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type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
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/* if task gate, we read the TSS segment and we load it */
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if (type == 5) {
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if (!(e2 & DESC_P_MASK))
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raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
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tss_selector = e1 >> 16;
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if (tss_selector & 4)
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raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
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if (load_segment(&e1, &e2, tss_selector) != 0)
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raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
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if (e2 & DESC_S_MASK)
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raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
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type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
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if ((type & 7) != 1)
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raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
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}
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if (!(e2 & DESC_P_MASK))
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raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
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if (type & 8)
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tss_limit_max = 103;
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else
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tss_limit_max = 43;
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tss_limit = get_seg_limit(e1, e2);
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tss_base = get_seg_base(e1, e2);
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if ((tss_selector & 4) != 0 ||
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tss_limit < tss_limit_max)
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raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
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old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
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if (old_type & 8)
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old_tss_limit_max = 103;
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else
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old_tss_limit_max = 43;
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/* read all the registers from the new TSS */
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if (type & 8) {
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/* 32 bit */
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new_cr3 = ldl_kernel(tss_base + 0x1c);
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new_eip = ldl_kernel(tss_base + 0x20);
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new_eflags = ldl_kernel(tss_base + 0x24);
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for(i = 0; i < 8; i++)
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new_regs[i] = ldl_kernel(tss_base + (0x28 + i * 4));
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for(i = 0; i < 6; i++)
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new_segs[i] = lduw_kernel(tss_base + (0x48 + i * 4));
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new_ldt = lduw_kernel(tss_base + 0x60);
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new_trap = ldl_kernel(tss_base + 0x64);
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} else {
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/* 16 bit */
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new_cr3 = 0;
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new_eip = lduw_kernel(tss_base + 0x0e);
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new_eflags = lduw_kernel(tss_base + 0x10);
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for(i = 0; i < 8; i++)
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new_regs[i] = lduw_kernel(tss_base + (0x12 + i * 2)) | 0xffff0000;
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for(i = 0; i < 4; i++)
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new_segs[i] = lduw_kernel(tss_base + (0x22 + i * 4));
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new_ldt = lduw_kernel(tss_base + 0x2a);
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new_segs[R_FS] = 0;
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new_segs[R_GS] = 0;
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new_trap = 0;
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}
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/* NOTE: we must avoid memory exceptions during the task switch,
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so we make dummy accesses before */
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/* XXX: it can still fail in some cases, so a bigger hack is
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necessary to valid the TLB after having done the accesses */
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v1 = ldub_kernel(env->tr.base);
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v2 = ldub(env->tr.base + old_tss_limit_max);
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stb_kernel(env->tr.base, v1);
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stb_kernel(env->tr.base + old_tss_limit_max, v2);
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/* clear busy bit (it is restartable) */
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if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
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uint8_t *ptr;
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uint32_t e2;
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ptr = env->gdt.base + (env->tr.selector << 3);
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e2 = ldl_kernel(ptr + 4);
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e2 &= ~DESC_TSS_BUSY_MASK;
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stl_kernel(ptr + 4, e2);
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}
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old_eflags = compute_eflags();
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if (source == SWITCH_TSS_IRET)
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old_eflags &= ~NT_MASK;
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/* save the current state in the old TSS */
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if (type & 8) {
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/* 32 bit */
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stl_kernel(env->tr.base + 0x20, env->eip);
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stl_kernel(env->tr.base + 0x24, old_eflags);
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for(i = 0; i < 8; i++)
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stl_kernel(env->tr.base + (0x28 + i * 4), env->regs[i]);
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for(i = 0; i < 6; i++)
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stw_kernel(env->tr.base + (0x48 + i * 4), env->segs[i].selector);
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} else {
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/* 16 bit */
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stw_kernel(env->tr.base + 0x0e, new_eip);
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stw_kernel(env->tr.base + 0x10, old_eflags);
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for(i = 0; i < 8; i++)
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stw_kernel(env->tr.base + (0x12 + i * 2), env->regs[i]);
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for(i = 0; i < 4; i++)
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stw_kernel(env->tr.base + (0x22 + i * 4), env->segs[i].selector);
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}
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/* now if an exception occurs, it will occurs in the next task
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context */
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if (source == SWITCH_TSS_CALL) {
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stw_kernel(tss_base, env->tr.selector);
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new_eflags |= NT_MASK;
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}
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/* set busy bit */
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if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
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uint8_t *ptr;
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uint32_t e2;
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ptr = env->gdt.base + (tss_selector << 3);
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e2 = ldl_kernel(ptr + 4);
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e2 |= DESC_TSS_BUSY_MASK;
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stl_kernel(ptr + 4, e2);
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}
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/* set the new CPU state */
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/* from this point, any exception which occurs can give problems */
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env->cr[0] |= CR0_TS_MASK;
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env->tr.selector = tss_selector;
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env->tr.base = tss_base;
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env->tr.limit = tss_limit;
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env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK;
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if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) {
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env->cr[3] = new_cr3;
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cpu_x86_update_cr3(env);
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}
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/* load all registers without an exception, then reload them with
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possible exception */
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env->eip = new_eip;
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eflags_mask = FL_UPDATE_CPL0_MASK;
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if (!(type & 8))
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eflags_mask &= 0xffff;
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load_eflags(new_eflags, eflags_mask);
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for(i = 0; i < 8; i++)
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env->regs[i] = new_regs[i];
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if (new_eflags & VM_MASK) {
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for(i = 0; i < 6; i++)
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load_seg_vm(i, new_segs[i]);
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/* in vm86, CPL is always 3 */
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cpu_x86_set_cpl(env, 3);
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} else {
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/* CPL is set the RPL of CS */
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cpu_x86_set_cpl(env, new_segs[R_CS] & 3);
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/* first just selectors as the rest may trigger exceptions */
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for(i = 0; i < 6; i++)
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cpu_x86_load_seg_cache(env, i, new_segs[i], NULL, 0, 0);
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}
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env->ldt.selector = new_ldt & ~4;
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env->ldt.base = NULL;
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env->ldt.limit = 0;
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env->ldt.flags = 0;
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/* load the LDT */
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if (new_ldt & 4)
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raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
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dt = &env->gdt;
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index = new_ldt & ~7;
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if ((index + 7) > dt->limit)
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raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
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ptr = dt->base + index;
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e1 = ldl_kernel(ptr);
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e2 = ldl_kernel(ptr + 4);
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if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
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raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
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if (!(e2 & DESC_P_MASK))
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raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
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load_seg_cache_raw_dt(&env->ldt, e1, e2);
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/* load the segments */
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if (!(new_eflags & VM_MASK)) {
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tss_load_seg(R_CS, new_segs[R_CS]);
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tss_load_seg(R_SS, new_segs[R_SS]);
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tss_load_seg(R_ES, new_segs[R_ES]);
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tss_load_seg(R_DS, new_segs[R_DS]);
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tss_load_seg(R_FS, new_segs[R_FS]);
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tss_load_seg(R_GS, new_segs[R_GS]);
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}
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/* check that EIP is in the CS segment limits */
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if (new_eip > env->segs[R_CS].limit) {
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raise_exception_err(EXCP0D_GPF, 0);
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}
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}
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/* check if Port I/O is allowed in TSS */
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static inline void check_io(int addr, int size)
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{
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int io_offset, val, mask;
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/* TSS must be a valid 32 bit one */
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if (!(env->tr.flags & DESC_P_MASK) ||
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((env->tr.flags >> DESC_TYPE_SHIFT) & 0xf) != 9 ||
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env->tr.limit < 103)
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goto fail;
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io_offset = lduw_kernel(env->tr.base + 0x66);
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io_offset += (addr >> 3);
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/* Note: the check needs two bytes */
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if ((io_offset + 1) > env->tr.limit)
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goto fail;
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val = lduw_kernel(env->tr.base + io_offset);
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val >>= (addr & 7);
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mask = (1 << size) - 1;
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/* all bits must be zero to allow the I/O */
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if ((val & mask) != 0) {
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fail:
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raise_exception_err(EXCP0D_GPF, 0);
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}
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}
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void check_iob_T0(void)
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{
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check_io(T0, 1);
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}
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void check_iow_T0(void)
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{
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check_io(T0, 2);
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}
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void check_iol_T0(void)
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{
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check_io(T0, 4);
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}
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void check_iob_DX(void)
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{
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check_io(EDX & 0xffff, 1);
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}
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void check_iow_DX(void)
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{
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check_io(EDX & 0xffff, 2);
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}
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void check_iol_DX(void)
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{
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check_io(EDX & 0xffff, 4);
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}
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/* protected mode interrupt */
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static void do_interrupt_protected(int intno, int is_int, int error_code,
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unsigned int next_eip, int is_hw)
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@ -222,6 +540,21 @@ static void do_interrupt_protected(int intno, int is_int, int error_code,
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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)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user