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qemu-e2k/target-i386/seg_helper.c
Jincheng Miao 47575997be linux-user: Fix syscall instruction usermode emulation on X86_64 
Currently syscall instruction is buggy on user mode X86_64,
the EIP is updated after do_syscall(), that is too late for
clone(). Because clone() will create a thread at the env->EIP
(the address of syscall insn), and then child thread enters
do_syscall() again, that is not expected. Sometimes it is tragic.

User mode syscall insn emulation is not used MSR, so the
action should be same to INT 0x80. INT 0x80 will update EIP in
do_interrupt(), ditto for syscall() for consistency.

Signed-off-by: Jincheng Miao <jmiao@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
2014-08-22 15:06:33 +03:00

2531 lines
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/*
* x86 segmentation related helpers:
* TSS, interrupts, system calls, jumps and call/task gates, descriptors
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cpu.h"
#include "qemu/log.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
//#define DEBUG_PCALL
#ifdef DEBUG_PCALL
# define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__)
# define LOG_PCALL_STATE(cpu) \
log_cpu_state_mask(CPU_LOG_PCALL, (cpu), CPU_DUMP_CCOP)
#else
# define LOG_PCALL(...) do { } while (0)
# define LOG_PCALL_STATE(cpu) do { } while (0)
#endif
#ifndef CONFIG_USER_ONLY
#define CPU_MMU_INDEX (cpu_mmu_index_kernel(env))
#define MEMSUFFIX _kernel
#define DATA_SIZE 1
#include "exec/cpu_ldst_template.h"
#define DATA_SIZE 2
#include "exec/cpu_ldst_template.h"
#define DATA_SIZE 4
#include "exec/cpu_ldst_template.h"
#define DATA_SIZE 8
#include "exec/cpu_ldst_template.h"
#undef CPU_MMU_INDEX
#undef MEMSUFFIX
#endif
/* return non zero if error */
static inline int load_segment(CPUX86State *env, uint32_t *e1_ptr,
uint32_t *e2_ptr, int selector)
{
SegmentCache *dt;
int index;
target_ulong 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 = cpu_ldl_kernel(env, ptr);
*e2_ptr = cpu_ldl_kernel(env, 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 uint32_t get_seg_base(uint32_t e1, uint32_t e2)
{
return (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(CPUX86State *env, int seg, int selector)
{
selector &= 0xffff;
cpu_x86_load_seg_cache(env, seg, selector, (selector << 4), 0xffff,
DESC_P_MASK | DESC_S_MASK | DESC_W_MASK |
DESC_A_MASK | (3 << DESC_DPL_SHIFT));
}
static inline void get_ss_esp_from_tss(CPUX86State *env, uint32_t *ss_ptr,
uint32_t *esp_ptr, int dpl)
{
X86CPU *cpu = x86_env_get_cpu(env);
int type, index, shift;
#if 0
{
int i;
printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit);
for (i = 0; i < env->tr.limit; i++) {
printf("%02x ", env->tr.base[i]);
if ((i & 7) == 7) {
printf("\n");
}
}
printf("\n");
}
#endif
if (!(env->tr.flags & DESC_P_MASK)) {
cpu_abort(CPU(cpu), "invalid tss");
}
type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
if ((type & 7) != 1) {
cpu_abort(CPU(cpu), "invalid tss type");
}
shift = type >> 3;
index = (dpl * 4 + 2) << shift;
if (index + (4 << shift) - 1 > env->tr.limit) {
raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
}
if (shift == 0) {
*esp_ptr = cpu_lduw_kernel(env, env->tr.base + index);
*ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 2);
} else {
*esp_ptr = cpu_ldl_kernel(env, env->tr.base + index);
*ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 4);
}
}
static void tss_load_seg(CPUX86State *env, int seg_reg, int selector, int cpl)
{
uint32_t e1, e2;
int rpl, dpl;
if ((selector & 0xfffc) != 0) {
if (load_segment(env, &e1, &e2, selector) != 0) {
raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
}
if (!(e2 & DESC_S_MASK)) {
raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (seg_reg == R_CS) {
if (!(e2 & DESC_CS_MASK)) {
raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
}
if (dpl != rpl) {
raise_exception_err(env, 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(env, EXCP0A_TSS, selector & 0xfffc);
}
if (dpl != cpl || dpl != rpl) {
raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
}
} else {
/* not readable code */
if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) {
raise_exception_err(env, 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(env, EXCP0A_TSS, selector & 0xfffc);
}
}
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, 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(env, 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(CPUX86State *env, int tss_selector,
uint32_t e1, uint32_t e2, int source,
uint32_t next_eip)
{
int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i;
target_ulong 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;
target_ulong ptr;
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type,
source);
/* if task gate, we read the TSS segment and we load it */
if (type == 5) {
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
}
tss_selector = e1 >> 16;
if (tss_selector & 4) {
raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
}
if (load_segment(env, &e1, &e2, tss_selector) != 0) {
raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
}
if (e2 & DESC_S_MASK) {
raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
}
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
if ((type & 7) != 1) {
raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
}
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
}
if (type & 8) {
tss_limit_max = 103;
} else {
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(env, 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 = cpu_ldl_kernel(env, tss_base + 0x1c);
new_eip = cpu_ldl_kernel(env, tss_base + 0x20);
new_eflags = cpu_ldl_kernel(env, tss_base + 0x24);
for (i = 0; i < 8; i++) {
new_regs[i] = cpu_ldl_kernel(env, tss_base + (0x28 + i * 4));
}
for (i = 0; i < 6; i++) {
new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x48 + i * 4));
}
new_ldt = cpu_lduw_kernel(env, tss_base + 0x60);
new_trap = cpu_ldl_kernel(env, tss_base + 0x64);
} else {
/* 16 bit */
new_cr3 = 0;
new_eip = cpu_lduw_kernel(env, tss_base + 0x0e);
new_eflags = cpu_lduw_kernel(env, tss_base + 0x10);
for (i = 0; i < 8; i++) {
new_regs[i] = cpu_lduw_kernel(env, tss_base + (0x12 + i * 2)) |
0xffff0000;
}
for (i = 0; i < 4; i++) {
new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x22 + i * 4));
}
new_ldt = cpu_lduw_kernel(env, tss_base + 0x2a);
new_segs[R_FS] = 0;
new_segs[R_GS] = 0;
new_trap = 0;
}
/* XXX: avoid a compiler warning, see
http://support.amd.com/us/Processor_TechDocs/24593.pdf
chapters 12.2.5 and 13.2.4 on how to implement TSS Trap bit */
(void)new_trap;
/* 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 = cpu_ldub_kernel(env, env->tr.base);
v2 = cpu_ldub_kernel(env, env->tr.base + old_tss_limit_max);
cpu_stb_kernel(env, env->tr.base, v1);
cpu_stb_kernel(env, env->tr.base + old_tss_limit_max, v2);
/* clear busy bit (it is restartable) */
if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
target_ulong ptr;
uint32_t e2;
ptr = env->gdt.base + (env->tr.selector & ~7);
e2 = cpu_ldl_kernel(env, ptr + 4);
e2 &= ~DESC_TSS_BUSY_MASK;
cpu_stl_kernel(env, ptr + 4, e2);
}
old_eflags = cpu_compute_eflags(env);
if (source == SWITCH_TSS_IRET) {
old_eflags &= ~NT_MASK;
}
/* save the current state in the old TSS */
if (type & 8) {
/* 32 bit */
cpu_stl_kernel(env, env->tr.base + 0x20, next_eip);
cpu_stl_kernel(env, env->tr.base + 0x24, old_eflags);
cpu_stl_kernel(env, env->tr.base + (0x28 + 0 * 4), env->regs[R_EAX]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 1 * 4), env->regs[R_ECX]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 2 * 4), env->regs[R_EDX]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 3 * 4), env->regs[R_EBX]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 4 * 4), env->regs[R_ESP]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 5 * 4), env->regs[R_EBP]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 6 * 4), env->regs[R_ESI]);
cpu_stl_kernel(env, env->tr.base + (0x28 + 7 * 4), env->regs[R_EDI]);
for (i = 0; i < 6; i++) {
cpu_stw_kernel(env, env->tr.base + (0x48 + i * 4),
env->segs[i].selector);
}
} else {
/* 16 bit */
cpu_stw_kernel(env, env->tr.base + 0x0e, next_eip);
cpu_stw_kernel(env, env->tr.base + 0x10, old_eflags);
cpu_stw_kernel(env, env->tr.base + (0x12 + 0 * 2), env->regs[R_EAX]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 1 * 2), env->regs[R_ECX]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 2 * 2), env->regs[R_EDX]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 3 * 2), env->regs[R_EBX]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 4 * 2), env->regs[R_ESP]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 5 * 2), env->regs[R_EBP]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 6 * 2), env->regs[R_ESI]);
cpu_stw_kernel(env, env->tr.base + (0x12 + 7 * 2), env->regs[R_EDI]);
for (i = 0; i < 4; i++) {
cpu_stw_kernel(env, 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) {
cpu_stw_kernel(env, tss_base, env->tr.selector);
new_eflags |= NT_MASK;
}
/* set busy bit */
if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
target_ulong ptr;
uint32_t e2;
ptr = env->gdt.base + (tss_selector & ~7);
e2 = cpu_ldl_kernel(env, ptr + 4);
e2 |= DESC_TSS_BUSY_MASK;
cpu_stl_kernel(env, 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->hflags |= HF_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)) {
cpu_x86_update_cr3(env, new_cr3);
}
/* load all registers without an exception, then reload them with
possible exception */
env->eip = new_eip;
eflags_mask = TF_MASK | AC_MASK | ID_MASK |
IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK;
if (!(type & 8)) {
eflags_mask &= 0xffff;
}
cpu_load_eflags(env, new_eflags, eflags_mask);
/* XXX: what to do in 16 bit case? */
env->regs[R_EAX] = new_regs[0];
env->regs[R_ECX] = new_regs[1];
env->regs[R_EDX] = new_regs[2];
env->regs[R_EBX] = new_regs[3];
env->regs[R_ESP] = new_regs[4];
env->regs[R_EBP] = new_regs[5];
env->regs[R_ESI] = new_regs[6];
env->regs[R_EDI] = new_regs[7];
if (new_eflags & VM_MASK) {
for (i = 0; i < 6; i++) {
load_seg_vm(env, i, new_segs[i]);
}
} else {
/* 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], 0, 0, 0);
}
}
env->ldt.selector = new_ldt & ~4;
env->ldt.base = 0;
env->ldt.limit = 0;
env->ldt.flags = 0;
/* load the LDT */
if (new_ldt & 4) {
raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
}
if ((new_ldt & 0xfffc) != 0) {
dt = &env->gdt;
index = new_ldt & ~7;
if ((index + 7) > dt->limit) {
raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
}
ptr = dt->base + index;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
}
load_seg_cache_raw_dt(&env->ldt, e1, e2);
}
/* load the segments */
if (!(new_eflags & VM_MASK)) {
int cpl = new_segs[R_CS] & 3;
tss_load_seg(env, R_CS, new_segs[R_CS], cpl);
tss_load_seg(env, R_SS, new_segs[R_SS], cpl);
tss_load_seg(env, R_ES, new_segs[R_ES], cpl);
tss_load_seg(env, R_DS, new_segs[R_DS], cpl);
tss_load_seg(env, R_FS, new_segs[R_FS], cpl);
tss_load_seg(env, R_GS, new_segs[R_GS], cpl);
}
/* check that env->eip is in the CS segment limits */
if (new_eip > env->segs[R_CS].limit) {
/* XXX: different exception if CALL? */
raise_exception_err(env, EXCP0D_GPF, 0);
}
#ifndef CONFIG_USER_ONLY
/* reset local breakpoints */
if (env->dr[7] & DR7_LOCAL_BP_MASK) {
for (i = 0; i < DR7_MAX_BP; i++) {
if (hw_local_breakpoint_enabled(env->dr[7], i) &&
!hw_global_breakpoint_enabled(env->dr[7], i)) {
hw_breakpoint_remove(env, i);
}
}
env->dr[7] &= ~DR7_LOCAL_BP_MASK;
}
#endif
}
static inline unsigned int get_sp_mask(unsigned int e2)
{
if (e2 & DESC_B_MASK) {
return 0xffffffff;
} else {
return 0xffff;
}
}
static int exception_has_error_code(int intno)
{
switch (intno) {
case 8:
case 10:
case 11:
case 12:
case 13:
case 14:
case 17:
return 1;
}
return 0;
}
#ifdef TARGET_X86_64
#define SET_ESP(val, sp_mask) \
do { \
if ((sp_mask) == 0xffff) { \
env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | \
((val) & 0xffff); \
} else if ((sp_mask) == 0xffffffffLL) { \
env->regs[R_ESP] = (uint32_t)(val); \
} else { \
env->regs[R_ESP] = (val); \
} \
} while (0)
#else
#define SET_ESP(val, sp_mask) \
do { \
env->regs[R_ESP] = (env->regs[R_ESP] & ~(sp_mask)) | \
((val) & (sp_mask)); \
} while (0)
#endif
/* in 64-bit machines, this can overflow. So this segment addition macro
* can be used to trim the value to 32-bit whenever needed */
#define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask))))
/* XXX: add a is_user flag to have proper security support */
#define PUSHW(ssp, sp, sp_mask, val) \
{ \
sp -= 2; \
cpu_stw_kernel(env, (ssp) + (sp & (sp_mask)), (val)); \
}
#define PUSHL(ssp, sp, sp_mask, val) \
{ \
sp -= 4; \
cpu_stl_kernel(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val)); \
}
#define POPW(ssp, sp, sp_mask, val) \
{ \
val = cpu_lduw_kernel(env, (ssp) + (sp & (sp_mask))); \
sp += 2; \
}
#define POPL(ssp, sp, sp_mask, val) \
{ \
val = (uint32_t)cpu_ldl_kernel(env, SEG_ADDL(ssp, sp, sp_mask)); \
sp += 4; \
}
/* protected mode interrupt */
static void do_interrupt_protected(CPUX86State *env, int intno, int is_int,
int error_code, unsigned int next_eip,
int is_hw)
{
SegmentCache *dt;
target_ulong ptr, ssp;
int type, dpl, selector, ss_dpl, cpl;
int has_error_code, new_stack, shift;
uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0;
uint32_t old_eip, sp_mask;
int vm86 = env->eflags & VM_MASK;
has_error_code = 0;
if (!is_int && !is_hw) {
has_error_code = exception_has_error_code(intno);
}
if (is_int) {
old_eip = next_eip;
} else {
old_eip = env->eip;
}
dt = &env->idt;
if (intno * 8 + 7 > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
}
ptr = dt->base + intno * 8;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
/* check gate type */
type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
switch (type) {
case 5: /* task gate */
/* must do that check here to return the correct error code */
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
}
switch_tss(env, intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip);
if (has_error_code) {
int type;
uint32_t mask;
/* push the error code */
type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
shift = type >> 3;
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) {
cpu_stl_kernel(env, ssp, error_code);
} else {
cpu_stw_kernel(env, ssp, error_code);
}
SET_ESP(esp, mask);
}
return;
case 6: /* 286 interrupt gate */
case 7: /* 286 trap gate */
case 14: /* 386 interrupt gate */
case 15: /* 386 trap gate */
break;
default:
raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
break;
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
/* check privilege if software int */
if (is_int && dpl < cpl) {
raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
}
/* check valid bit */
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
}
selector = e1 >> 16;
offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
if ((selector & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
if (load_segment(env, &e1, &e2, selector) != 0) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
if (!(e2 & DESC_C_MASK) && dpl < cpl) {
/* to inner privilege */
get_ss_esp_from_tss(env, &ss, &esp, dpl);
if ((ss & 0xfffc) == 0) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if ((ss & 3) != dpl) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
if (ss_dpl != dpl) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (!(ss_e2 & DESC_S_MASK) ||
(ss_e2 & DESC_CS_MASK) ||
!(ss_e2 & DESC_W_MASK)) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (!(ss_e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
new_stack = 1;
sp_mask = get_sp_mask(ss_e2);
ssp = get_seg_base(ss_e1, ss_e2);
} else if ((e2 & DESC_C_MASK) || dpl == cpl) {
/* to same privilege */
if (vm86) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
new_stack = 0;
sp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
esp = env->regs[R_ESP];
dpl = cpl;
} else {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
new_stack = 0; /* avoid warning */
sp_mask = 0; /* avoid warning */
ssp = 0; /* avoid warning */
esp = 0; /* avoid warning */
}
shift = type >> 3;
#if 0
/* XXX: check that enough room is available */
push_size = 6 + (new_stack << 2) + (has_error_code << 1);
if (vm86) {
push_size += 8;
}
push_size <<= shift;
#endif
if (shift == 1) {
if (new_stack) {
if (vm86) {
PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector);
PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector);
PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector);
PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector);
}
PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector);
PUSHL(ssp, esp, sp_mask, env->regs[R_ESP]);
}
PUSHL(ssp, esp, sp_mask, cpu_compute_eflags(env));
PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector);
PUSHL(ssp, esp, sp_mask, old_eip);
if (has_error_code) {
PUSHL(ssp, esp, sp_mask, error_code);
}
} else {
if (new_stack) {
if (vm86) {
PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector);
PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector);
PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector);
PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector);
}
PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector);
PUSHW(ssp, esp, sp_mask, env->regs[R_ESP]);
}
PUSHW(ssp, esp, sp_mask, cpu_compute_eflags(env));
PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector);
PUSHW(ssp, esp, sp_mask, old_eip);
if (has_error_code) {
PUSHW(ssp, esp, sp_mask, error_code);
}
}
/* interrupt gate clear IF mask */
if ((type & 1) == 0) {
env->eflags &= ~IF_MASK;
}
env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
if (new_stack) {
if (vm86) {
cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0, 0);
cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0);
cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0);
cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0, 0);
}
ss = (ss & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_SS, ss,
ssp, get_seg_limit(ss_e1, ss_e2), ss_e2);
}
SET_ESP(esp, sp_mask);
selector = (selector & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_CS, selector,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
env->eip = offset;
}
#ifdef TARGET_X86_64
#define PUSHQ(sp, val) \
{ \
sp -= 8; \
cpu_stq_kernel(env, sp, (val)); \
}
#define POPQ(sp, val) \
{ \
val = cpu_ldq_kernel(env, sp); \
sp += 8; \
}
static inline target_ulong get_rsp_from_tss(CPUX86State *env, int level)
{
X86CPU *cpu = x86_env_get_cpu(env);
int index;
#if 0
printf("TR: base=" TARGET_FMT_lx " limit=%x\n",
env->tr.base, env->tr.limit);
#endif
if (!(env->tr.flags & DESC_P_MASK)) {
cpu_abort(CPU(cpu), "invalid tss");
}
index = 8 * level + 4;
if ((index + 7) > env->tr.limit) {
raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
}
return cpu_ldq_kernel(env, env->tr.base + index);
}
/* 64 bit interrupt */
static void do_interrupt64(CPUX86State *env, int intno, int is_int,
int error_code, target_ulong next_eip, int is_hw)
{
SegmentCache *dt;
target_ulong ptr;
int type, dpl, selector, cpl, ist;
int has_error_code, new_stack;
uint32_t e1, e2, e3, ss;
target_ulong old_eip, esp, offset;
has_error_code = 0;
if (!is_int && !is_hw) {
has_error_code = exception_has_error_code(intno);
}
if (is_int) {
old_eip = next_eip;
} else {
old_eip = env->eip;
}
dt = &env->idt;
if (intno * 16 + 15 > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
}
ptr = dt->base + intno * 16;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
e3 = cpu_ldl_kernel(env, ptr + 8);
/* check gate type */
type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
switch (type) {
case 14: /* 386 interrupt gate */
case 15: /* 386 trap gate */
break;
default:
raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
break;
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
/* check privilege if software int */
if (is_int && dpl < cpl) {
raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
}
/* check valid bit */
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, intno * 16 + 2);
}
selector = e1 >> 16;
offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff);
ist = e2 & 7;
if ((selector & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
if (load_segment(env, &e1, &e2, selector) != 0) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK)) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) {
/* to inner privilege */
if (ist != 0) {
esp = get_rsp_from_tss(env, ist + 3);
} else {
esp = get_rsp_from_tss(env, dpl);
}
esp &= ~0xfLL; /* align stack */
ss = 0;
new_stack = 1;
} else if ((e2 & DESC_C_MASK) || dpl == cpl) {
/* to same privilege */
if (env->eflags & VM_MASK) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
new_stack = 0;
if (ist != 0) {
esp = get_rsp_from_tss(env, ist + 3);
} else {
esp = env->regs[R_ESP];
}
esp &= ~0xfLL; /* align stack */
dpl = cpl;
} else {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
new_stack = 0; /* avoid warning */
esp = 0; /* avoid warning */
}
PUSHQ(esp, env->segs[R_SS].selector);
PUSHQ(esp, env->regs[R_ESP]);
PUSHQ(esp, cpu_compute_eflags(env));
PUSHQ(esp, env->segs[R_CS].selector);
PUSHQ(esp, old_eip);
if (has_error_code) {
PUSHQ(esp, error_code);
}
/* interrupt gate clear IF mask */
if ((type & 1) == 0) {
env->eflags &= ~IF_MASK;
}
env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
if (new_stack) {
ss = 0 | dpl;
cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0);
}
env->regs[R_ESP] = esp;
selector = (selector & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_CS, selector,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
env->eip = offset;
}
#endif
#ifdef TARGET_X86_64
#if defined(CONFIG_USER_ONLY)
void helper_syscall(CPUX86State *env, int next_eip_addend)
{
CPUState *cs = CPU(x86_env_get_cpu(env));
cs->exception_index = EXCP_SYSCALL;
env->exception_next_eip = env->eip + next_eip_addend;
cpu_loop_exit(cs);
}
#else
void helper_syscall(CPUX86State *env, int next_eip_addend)
{
int selector;
if (!(env->efer & MSR_EFER_SCE)) {
raise_exception_err(env, EXCP06_ILLOP, 0);
}
selector = (env->star >> 32) & 0xffff;
if (env->hflags & HF_LMA_MASK) {
int code64;
env->regs[R_ECX] = env->eip + next_eip_addend;
env->regs[11] = cpu_compute_eflags(env);
code64 = env->hflags & HF_CS64_MASK;
env->eflags &= ~env->fmask;
cpu_load_eflags(env, env->eflags, 0);
cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
DESC_L_MASK);
cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
if (code64) {
env->eip = env->lstar;
} else {
env->eip = env->cstar;
}
} else {
env->regs[R_ECX] = (uint32_t)(env->eip + next_eip_addend);
env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
env->eip = (uint32_t)env->star;
}
}
#endif
#endif
#ifdef TARGET_X86_64
void helper_sysret(CPUX86State *env, int dflag)
{
int cpl, selector;
if (!(env->efer & MSR_EFER_SCE)) {
raise_exception_err(env, EXCP06_ILLOP, 0);
}
cpl = env->hflags & HF_CPL_MASK;
if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
selector = (env->star >> 48) & 0xffff;
if (env->hflags & HF_LMA_MASK) {
cpu_load_eflags(env, (uint32_t)(env->regs[11]), TF_MASK | AC_MASK
| ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK |
NT_MASK);
if (dflag == 2) {
cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3,
0, 0xffffffff,
DESC_G_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
DESC_L_MASK);
env->eip = env->regs[R_ECX];
} else {
cpu_x86_load_seg_cache(env, R_CS, selector | 3,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
env->eip = (uint32_t)env->regs[R_ECX];
}
cpu_x86_load_seg_cache(env, R_SS, selector + 8,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
} else {
env->eflags |= IF_MASK;
cpu_x86_load_seg_cache(env, R_CS, selector | 3,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
env->eip = (uint32_t)env->regs[R_ECX];
cpu_x86_load_seg_cache(env, R_SS, selector + 8,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
}
}
#endif
/* real mode interrupt */
static void do_interrupt_real(CPUX86State *env, int intno, int is_int,
int error_code, unsigned int next_eip)
{
SegmentCache *dt;
target_ulong ptr, ssp;
int selector;
uint32_t offset, esp;
uint32_t old_cs, old_eip;
/* real mode (simpler!) */
dt = &env->idt;
if (intno * 4 + 3 > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
}
ptr = dt->base + intno * 4;
offset = cpu_lduw_kernel(env, ptr);
selector = cpu_lduw_kernel(env, ptr + 2);
esp = env->regs[R_ESP];
ssp = env->segs[R_SS].base;
if (is_int) {
old_eip = next_eip;
} else {
old_eip = env->eip;
}
old_cs = env->segs[R_CS].selector;
/* XXX: use SS segment size? */
PUSHW(ssp, esp, 0xffff, cpu_compute_eflags(env));
PUSHW(ssp, esp, 0xffff, old_cs);
PUSHW(ssp, esp, 0xffff, old_eip);
/* update processor state */
env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | (esp & 0xffff);
env->eip = offset;
env->segs[R_CS].selector = selector;
env->segs[R_CS].base = (selector << 4);
env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK);
}
#if defined(CONFIG_USER_ONLY)
/* fake user mode interrupt */
static void do_interrupt_user(CPUX86State *env, int intno, int is_int,
int error_code, target_ulong next_eip)
{
SegmentCache *dt;
target_ulong ptr;
int dpl, cpl, shift;
uint32_t e2;
dt = &env->idt;
if (env->hflags & HF_LMA_MASK) {
shift = 4;
} else {
shift = 3;
}
ptr = dt->base + (intno << shift);
e2 = cpu_ldl_kernel(env, ptr + 4);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
/* check privilege if software int */
if (is_int && dpl < cpl) {
raise_exception_err(env, EXCP0D_GPF, (intno << shift) + 2);
}
/* Since we emulate only user space, we cannot do more than
exiting the emulation with the suitable exception and error
code. So update EIP for INT 0x80 and EXCP_SYSCALL. */
if (is_int || intno == EXCP_SYSCALL) {
env->eip = next_eip;
}
}
#else
static void handle_even_inj(CPUX86State *env, int intno, int is_int,
int error_code, int is_hw, int rm)
{
CPUState *cs = CPU(x86_env_get_cpu(env));
uint32_t event_inj = ldl_phys(cs->as, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj));
if (!(event_inj & SVM_EVTINJ_VALID)) {
int type;
if (is_int) {
type = SVM_EVTINJ_TYPE_SOFT;
} else {
type = SVM_EVTINJ_TYPE_EXEPT;
}
event_inj = intno | type | SVM_EVTINJ_VALID;
if (!rm && exception_has_error_code(intno)) {
event_inj |= SVM_EVTINJ_VALID_ERR;
stl_phys(cs->as, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj_err),
error_code);
}
stl_phys(cs->as,
env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
event_inj);
}
}
#endif
/*
* Begin execution of an interruption. is_int is TRUE if coming from
* the int instruction. next_eip is the env->eip value AFTER the interrupt
* instruction. It is only relevant if is_int is TRUE.
*/
static void do_interrupt_all(X86CPU *cpu, int intno, int is_int,
int error_code, target_ulong next_eip, int is_hw)
{
CPUX86State *env = &cpu->env;
if (qemu_loglevel_mask(CPU_LOG_INT)) {
if ((env->cr[0] & CR0_PE_MASK)) {
static int count;
qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx
" pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx,
count, intno, error_code, is_int,
env->hflags & HF_CPL_MASK,
env->segs[R_CS].selector, env->eip,
(int)env->segs[R_CS].base + env->eip,
env->segs[R_SS].selector, env->regs[R_ESP]);
if (intno == 0x0e) {
qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]);
} else {
qemu_log(" env->regs[R_EAX]=" TARGET_FMT_lx, env->regs[R_EAX]);
}
qemu_log("\n");
log_cpu_state(CPU(cpu), CPU_DUMP_CCOP);
#if 0
{
int i;
target_ulong ptr;
qemu_log(" code=");
ptr = env->segs[R_CS].base + env->eip;
for (i = 0; i < 16; i++) {
qemu_log(" %02x", ldub(ptr + i));
}
qemu_log("\n");
}
#endif
count++;
}
}
if (env->cr[0] & CR0_PE_MASK) {
#if !defined(CONFIG_USER_ONLY)
if (env->hflags & HF_SVMI_MASK) {
handle_even_inj(env, intno, is_int, error_code, is_hw, 0);
}
#endif
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
do_interrupt64(env, intno, is_int, error_code, next_eip, is_hw);
} else
#endif
{
do_interrupt_protected(env, intno, is_int, error_code, next_eip,
is_hw);
}
} else {
#if !defined(CONFIG_USER_ONLY)
if (env->hflags & HF_SVMI_MASK) {
handle_even_inj(env, intno, is_int, error_code, is_hw, 1);
}
#endif
do_interrupt_real(env, intno, is_int, error_code, next_eip);
}
#if !defined(CONFIG_USER_ONLY)
if (env->hflags & HF_SVMI_MASK) {
CPUState *cs = CPU(cpu);
uint32_t event_inj = ldl_phys(cs->as, env->vm_vmcb +
offsetof(struct vmcb,
control.event_inj));
stl_phys(cs->as,
env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
event_inj & ~SVM_EVTINJ_VALID);
}
#endif
}
void x86_cpu_do_interrupt(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
#if defined(CONFIG_USER_ONLY)
/* if user mode only, we simulate a fake exception
which will be handled outside the cpu execution
loop */
do_interrupt_user(env, cs->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip);
/* successfully delivered */
env->old_exception = -1;
#else
/* simulate a real cpu exception. On i386, it can
trigger new exceptions, but we do not handle
double or triple faults yet. */
do_interrupt_all(cpu, cs->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip, 0);
/* successfully delivered */
env->old_exception = -1;
#endif
}
void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw)
{
do_interrupt_all(x86_env_get_cpu(env), intno, 0, 0, 0, is_hw);
}
void helper_enter_level(CPUX86State *env, int level, int data32,
target_ulong t1)
{
target_ulong ssp;
uint32_t esp_mask, esp, ebp;
esp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
ebp = env->regs[R_EBP];
esp = env->regs[R_ESP];
if (data32) {
/* 32 bit */
esp -= 4;
while (--level) {
esp -= 4;
ebp -= 4;
cpu_stl_data(env, ssp + (esp & esp_mask),
cpu_ldl_data(env, ssp + (ebp & esp_mask)));
}
esp -= 4;
cpu_stl_data(env, ssp + (esp & esp_mask), t1);
} else {
/* 16 bit */
esp -= 2;
while (--level) {
esp -= 2;
ebp -= 2;
cpu_stw_data(env, ssp + (esp & esp_mask),
cpu_lduw_data(env, ssp + (ebp & esp_mask)));
}
esp -= 2;
cpu_stw_data(env, ssp + (esp & esp_mask), t1);
}
}
#ifdef TARGET_X86_64
void helper_enter64_level(CPUX86State *env, int level, int data64,
target_ulong t1)
{
target_ulong esp, ebp;
ebp = env->regs[R_EBP];
esp = env->regs[R_ESP];
if (data64) {
/* 64 bit */
esp -= 8;
while (--level) {
esp -= 8;
ebp -= 8;
cpu_stq_data(env, esp, cpu_ldq_data(env, ebp));
}
esp -= 8;
cpu_stq_data(env, esp, t1);
} else {
/* 16 bit */
esp -= 2;
while (--level) {
esp -= 2;
ebp -= 2;
cpu_stw_data(env, esp, cpu_lduw_data(env, ebp));
}
esp -= 2;
cpu_stw_data(env, esp, t1);
}
}
#endif
void helper_lldt(CPUX86State *env, int selector)
{
SegmentCache *dt;
uint32_t e1, e2;
int index, entry_limit;
target_ulong ptr;
selector &= 0xffff;
if ((selector & 0xfffc) == 0) {
/* XXX: NULL selector case: invalid LDT */
env->ldt.base = 0;
env->ldt.limit = 0;
} else {
if (selector & 0x4) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
dt = &env->gdt;
index = selector & ~7;
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
entry_limit = 15;
} else
#endif
{
entry_limit = 7;
}
if ((index + entry_limit) > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
ptr = dt->base + index;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
uint32_t e3;
e3 = cpu_ldl_kernel(env, ptr + 8);
load_seg_cache_raw_dt(&env->ldt, e1, e2);
env->ldt.base |= (target_ulong)e3 << 32;
} else
#endif
{
load_seg_cache_raw_dt(&env->ldt, e1, e2);
}
}
env->ldt.selector = selector;
}
void helper_ltr(CPUX86State *env, int selector)
{
SegmentCache *dt;
uint32_t e1, e2;
int index, type, entry_limit;
target_ulong ptr;
selector &= 0xffff;
if ((selector & 0xfffc) == 0) {
/* NULL selector case: invalid TR */
env->tr.base = 0;
env->tr.limit = 0;
env->tr.flags = 0;
} else {
if (selector & 0x4) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
dt = &env->gdt;
index = selector & ~7;
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
entry_limit = 15;
} else
#endif
{
entry_limit = 7;
}
if ((index + entry_limit) > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
ptr = dt->base + index;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
if ((e2 & DESC_S_MASK) ||
(type != 1 && type != 9)) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
uint32_t e3, e4;
e3 = cpu_ldl_kernel(env, ptr + 8);
e4 = cpu_ldl_kernel(env, ptr + 12);
if ((e4 >> DESC_TYPE_SHIFT) & 0xf) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
load_seg_cache_raw_dt(&env->tr, e1, e2);
env->tr.base |= (target_ulong)e3 << 32;
} else
#endif
{
load_seg_cache_raw_dt(&env->tr, e1, e2);
}
e2 |= DESC_TSS_BUSY_MASK;
cpu_stl_kernel(env, ptr + 4, e2);
}
env->tr.selector = selector;
}
/* only works if protected mode and not VM86. seg_reg must be != R_CS */
void helper_load_seg(CPUX86State *env, int seg_reg, int selector)
{
uint32_t e1, e2;
int cpl, dpl, rpl;
SegmentCache *dt;
int index;
target_ulong ptr;
selector &= 0xffff;
cpl = env->hflags & HF_CPL_MASK;
if ((selector & 0xfffc) == 0) {
/* null selector case */
if (seg_reg == R_SS
#ifdef TARGET_X86_64
&& (!(env->hflags & HF_CS64_MASK) || cpl == 3)
#endif
) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0);
} else {
if (selector & 0x4) {
dt = &env->ldt;
} else {
dt = &env->gdt;
}
index = selector & ~7;
if ((index + 7) > dt->limit) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
ptr = dt->base + index;
e1 = cpu_ldl_kernel(env, ptr);
e2 = cpu_ldl_kernel(env, ptr + 4);
if (!(e2 & DESC_S_MASK)) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (seg_reg == R_SS) {
/* must be writable segment */
if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (rpl != cpl || dpl != cpl) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
} else {
/* must be readable segment */
if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
/* if not conforming code, test rights */
if (dpl < cpl || dpl < rpl) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
}
}
if (!(e2 & DESC_P_MASK)) {
if (seg_reg == R_SS) {
raise_exception_err(env, EXCP0C_STACK, selector & 0xfffc);
} else {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
}
/* set the access bit if not already set */
if (!(e2 & DESC_A_MASK)) {
e2 |= DESC_A_MASK;
cpu_stl_kernel(env, ptr + 4, e2);
}
cpu_x86_load_seg_cache(env, seg_reg, selector,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
#if 0
qemu_log("load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n",
selector, (unsigned long)sc->base, sc->limit, sc->flags);
#endif
}
}
/* protected mode jump */
void helper_ljmp_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
int next_eip_addend)
{
int gate_cs, type;
uint32_t e1, e2, cpl, dpl, rpl, limit;
target_ulong next_eip;
if ((new_cs & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
if (load_segment(env, &e1, &e2, new_cs) != 0) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
cpl = env->hflags & HF_CPL_MASK;
if (e2 & DESC_S_MASK) {
if (!(e2 & DESC_CS_MASK)) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (e2 & DESC_C_MASK) {
/* conforming code segment */
if (dpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
} else {
/* non conforming code segment */
rpl = new_cs & 3;
if (rpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
if (dpl != cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
}
limit = get_seg_limit(e1, e2);
if (new_eip > limit &&
!(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK)) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
get_seg_base(e1, e2), limit, e2);
env->eip = new_eip;
} else {
/* 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(env, EXCP0D_GPF, new_cs & 0xfffc);
}
next_eip = env->eip + next_eip_addend;
switch_tss(env, new_cs, e1, e2, SWITCH_TSS_JMP, next_eip);
break;
case 4: /* 286 call gate */
case 12: /* 386 call gate */
if ((dpl < cpl) || (dpl < rpl)) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
}
gate_cs = e1 >> 16;
new_eip = (e1 & 0xffff);
if (type == 12) {
new_eip |= (e2 & 0xffff0000);
}
if (load_segment(env, &e1, &e2, gate_cs) != 0) {
raise_exception_err(env, 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(env, EXCP0D_GPF, gate_cs & 0xfffc);
}
if (((e2 & DESC_C_MASK) && (dpl > cpl)) ||
(!(e2 & DESC_C_MASK) && (dpl != cpl))) {
raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
}
limit = get_seg_limit(e1, e2);
if (new_eip > limit) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl,
get_seg_base(e1, e2), limit, e2);
env->eip = new_eip;
break;
default:
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
break;
}
}
}
/* real mode call */
void helper_lcall_real(CPUX86State *env, int new_cs, target_ulong new_eip1,
int shift, int next_eip)
{
int new_eip;
uint32_t esp, esp_mask;
target_ulong ssp;
new_eip = new_eip1;
esp = env->regs[R_ESP];
esp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
if (shift) {
PUSHL(ssp, esp, esp_mask, env->segs[R_CS].selector);
PUSHL(ssp, esp, esp_mask, next_eip);
} else {
PUSHW(ssp, esp, esp_mask, env->segs[R_CS].selector);
PUSHW(ssp, esp, esp_mask, next_eip);
}
SET_ESP(esp, esp_mask);
env->eip = new_eip;
env->segs[R_CS].selector = new_cs;
env->segs[R_CS].base = (new_cs << 4);
}
/* protected mode call */
void helper_lcall_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
int shift, int next_eip_addend)
{
int new_stack, i;
uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count;
uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, sp, type, ss_dpl, sp_mask;
uint32_t val, limit, old_sp_mask;
target_ulong ssp, old_ssp, next_eip;
next_eip = env->eip + next_eip_addend;
LOG_PCALL("lcall %04x:%08x s=%d\n", new_cs, (uint32_t)new_eip, shift);
LOG_PCALL_STATE(CPU(x86_env_get_cpu(env)));
if ((new_cs & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
if (load_segment(env, &e1, &e2, new_cs) != 0) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
cpl = env->hflags & HF_CPL_MASK;
LOG_PCALL("desc=%08x:%08x\n", e1, e2);
if (e2 & DESC_S_MASK) {
if (!(e2 & DESC_CS_MASK)) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (e2 & DESC_C_MASK) {
/* conforming code segment */
if (dpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
} else {
/* non conforming code segment */
rpl = new_cs & 3;
if (rpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
if (dpl != cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
}
#ifdef TARGET_X86_64
/* XXX: check 16/32 bit cases in long mode */
if (shift == 2) {
target_ulong rsp;
/* 64 bit case */
rsp = env->regs[R_ESP];
PUSHQ(rsp, env->segs[R_CS].selector);
PUSHQ(rsp, next_eip);
/* from this point, not restartable */
env->regs[R_ESP] = rsp;
cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
get_seg_base(e1, e2),
get_seg_limit(e1, e2), e2);
env->eip = new_eip;
} else
#endif
{
sp = env->regs[R_ESP];
sp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
if (shift) {
PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
PUSHL(ssp, sp, sp_mask, next_eip);
} else {
PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
PUSHW(ssp, sp, sp_mask, next_eip);
}
limit = get_seg_limit(e1, e2);
if (new_eip > limit) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
/* from this point, not restartable */
SET_ESP(sp, sp_mask);
cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
get_seg_base(e1, e2), limit, e2);
env->eip = new_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 */
if (dpl < cpl || dpl < rpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
switch_tss(env, new_cs, e1, e2, SWITCH_TSS_CALL, next_eip);
return;
case 4: /* 286 call gate */
case 12: /* 386 call gate */
break;
default:
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
break;
}
shift = type >> 3;
if (dpl < cpl || dpl < rpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
/* check valid bit */
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
}
selector = e1 >> 16;
offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
param_count = e2 & 0x1f;
if ((selector & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
if (load_segment(env, &e1, &e2, selector) != 0) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl) {
raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
}
if (!(e2 & DESC_C_MASK) && dpl < cpl) {
/* to inner privilege */
get_ss_esp_from_tss(env, &ss, &sp, dpl);
LOG_PCALL("new ss:esp=%04x:%08x param_count=%d env->regs[R_ESP]="
TARGET_FMT_lx "\n", ss, sp, param_count,
env->regs[R_ESP]);
if ((ss & 0xfffc) == 0) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if ((ss & 3) != dpl) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
if (ss_dpl != dpl) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (!(ss_e2 & DESC_S_MASK) ||
(ss_e2 & DESC_CS_MASK) ||
!(ss_e2 & DESC_W_MASK)) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
if (!(ss_e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
}
/* push_size = ((param_count * 2) + 8) << shift; */
old_sp_mask = get_sp_mask(env->segs[R_SS].flags);
old_ssp = env->segs[R_SS].base;
sp_mask = get_sp_mask(ss_e2);
ssp = get_seg_base(ss_e1, ss_e2);
if (shift) {
PUSHL(ssp, sp, sp_mask, env->segs[R_SS].selector);
PUSHL(ssp, sp, sp_mask, env->regs[R_ESP]);
for (i = param_count - 1; i >= 0; i--) {
val = cpu_ldl_kernel(env, old_ssp +
((env->regs[R_ESP] + i * 4) &
old_sp_mask));
PUSHL(ssp, sp, sp_mask, val);
}
} else {
PUSHW(ssp, sp, sp_mask, env->segs[R_SS].selector);
PUSHW(ssp, sp, sp_mask, env->regs[R_ESP]);
for (i = param_count - 1; i >= 0; i--) {
val = cpu_lduw_kernel(env, old_ssp +
((env->regs[R_ESP] + i * 2) &
old_sp_mask));
PUSHW(ssp, sp, sp_mask, val);
}
}
new_stack = 1;
} else {
/* to same privilege */
sp = env->regs[R_ESP];
sp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
/* push_size = (4 << shift); */
new_stack = 0;
}
if (shift) {
PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
PUSHL(ssp, sp, sp_mask, next_eip);
} else {
PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
PUSHW(ssp, sp, sp_mask, next_eip);
}
/* from this point, not restartable */
if (new_stack) {
ss = (ss & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_SS, ss,
ssp,
get_seg_limit(ss_e1, ss_e2),
ss_e2);
}
selector = (selector & ~3) | dpl;
cpu_x86_load_seg_cache(env, R_CS, selector,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
SET_ESP(sp, sp_mask);
env->eip = offset;
}
}
/* real and vm86 mode iret */
void helper_iret_real(CPUX86State *env, int shift)
{
uint32_t sp, new_cs, new_eip, new_eflags, sp_mask;
target_ulong ssp;
int eflags_mask;
sp_mask = 0xffff; /* XXXX: use SS segment size? */
sp = env->regs[R_ESP];
ssp = env->segs[R_SS].base;
if (shift == 1) {
/* 32 bits */
POPL(ssp, sp, sp_mask, new_eip);
POPL(ssp, sp, sp_mask, new_cs);
new_cs &= 0xffff;
POPL(ssp, sp, sp_mask, new_eflags);
} else {
/* 16 bits */
POPW(ssp, sp, sp_mask, new_eip);
POPW(ssp, sp, sp_mask, new_cs);
POPW(ssp, sp, sp_mask, new_eflags);
}
env->regs[R_ESP] = (env->regs[R_ESP] & ~sp_mask) | (sp & sp_mask);
env->segs[R_CS].selector = new_cs;
env->segs[R_CS].base = (new_cs << 4);
env->eip = new_eip;
if (env->eflags & VM_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 | NT_MASK;
}
if (shift == 0) {
eflags_mask &= 0xffff;
}
cpu_load_eflags(env, new_eflags, eflags_mask);
env->hflags2 &= ~HF2_NMI_MASK;
}
static inline void validate_seg(CPUX86State *env, int seg_reg, int cpl)
{
int dpl;
uint32_t e2;
/* XXX: on x86_64, we do not want to nullify FS and GS because
they may still contain a valid base. I would be interested to
know how a real x86_64 CPU behaves */
if ((seg_reg == R_FS || seg_reg == R_GS) &&
(env->segs[seg_reg].selector & 0xfffc) == 0) {
return;
}
e2 = env->segs[seg_reg].flags;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
/* data or non conforming code segment */
if (dpl < cpl) {
cpu_x86_load_seg_cache(env, seg_reg, 0, 0, 0, 0);
}
}
}
/* protected mode iret */
static inline void helper_ret_protected(CPUX86State *env, int shift,
int is_iret, int addend)
{
uint32_t new_cs, new_eflags, new_ss;
uint32_t new_es, new_ds, new_fs, new_gs;
uint32_t e1, e2, ss_e1, ss_e2;
int cpl, dpl, rpl, eflags_mask, iopl;
target_ulong ssp, sp, new_eip, new_esp, sp_mask;
#ifdef TARGET_X86_64
if (shift == 2) {
sp_mask = -1;
} else
#endif
{
sp_mask = get_sp_mask(env->segs[R_SS].flags);
}
sp = env->regs[R_ESP];
ssp = env->segs[R_SS].base;
new_eflags = 0; /* avoid warning */
#ifdef TARGET_X86_64
if (shift == 2) {
POPQ(sp, new_eip);
POPQ(sp, new_cs);
new_cs &= 0xffff;
if (is_iret) {
POPQ(sp, new_eflags);
}
} else
#endif
{
if (shift == 1) {
/* 32 bits */
POPL(ssp, sp, sp_mask, new_eip);
POPL(ssp, sp, sp_mask, new_cs);
new_cs &= 0xffff;
if (is_iret) {
POPL(ssp, sp, sp_mask, new_eflags);
if (new_eflags & VM_MASK) {
goto return_to_vm86;
}
}
} else {
/* 16 bits */
POPW(ssp, sp, sp_mask, new_eip);
POPW(ssp, sp, sp_mask, new_cs);
if (is_iret) {
POPW(ssp, sp, sp_mask, new_eflags);
}
}
}
LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n",
new_cs, new_eip, shift, addend);
LOG_PCALL_STATE(CPU(x86_env_get_cpu(env)));
if ((new_cs & 0xfffc) == 0) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
if (load_segment(env, &e1, &e2, new_cs) != 0) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
if (!(e2 & DESC_S_MASK) ||
!(e2 & DESC_CS_MASK)) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
cpl = env->hflags & HF_CPL_MASK;
rpl = new_cs & 3;
if (rpl < cpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (e2 & DESC_C_MASK) {
if (dpl > rpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
} else {
if (dpl != rpl) {
raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
}
}
if (!(e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
}
sp += addend;
if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) ||
((env->hflags & HF_CS64_MASK) && !is_iret))) {
/* return to same privilege level */
cpu_x86_load_seg_cache(env, R_CS, new_cs,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
} else {
/* return to different privilege level */
#ifdef TARGET_X86_64
if (shift == 2) {
POPQ(sp, new_esp);
POPQ(sp, new_ss);
new_ss &= 0xffff;
} else
#endif
{
if (shift == 1) {
/* 32 bits */
POPL(ssp, sp, sp_mask, new_esp);
POPL(ssp, sp, sp_mask, new_ss);
new_ss &= 0xffff;
} else {
/* 16 bits */
POPW(ssp, sp, sp_mask, new_esp);
POPW(ssp, sp, sp_mask, new_ss);
}
}
LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n",
new_ss, new_esp);
if ((new_ss & 0xfffc) == 0) {
#ifdef TARGET_X86_64
/* NULL ss is allowed in long mode if cpl != 3 */
/* XXX: test CS64? */
if ((env->hflags & HF_LMA_MASK) && rpl != 3) {
cpu_x86_load_seg_cache(env, R_SS, new_ss,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
ss_e2 = DESC_B_MASK; /* XXX: should not be needed? */
} else
#endif
{
raise_exception_err(env, EXCP0D_GPF, 0);
}
} else {
if ((new_ss & 3) != rpl) {
raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
}
if (load_segment(env, &ss_e1, &ss_e2, new_ss) != 0) {
raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
}
if (!(ss_e2 & DESC_S_MASK) ||
(ss_e2 & DESC_CS_MASK) ||
!(ss_e2 & DESC_W_MASK)) {
raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
}
dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
if (dpl != rpl) {
raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
}
if (!(ss_e2 & DESC_P_MASK)) {
raise_exception_err(env, EXCP0B_NOSEG, new_ss & 0xfffc);
}
cpu_x86_load_seg_cache(env, R_SS, new_ss,
get_seg_base(ss_e1, ss_e2),
get_seg_limit(ss_e1, ss_e2),
ss_e2);
}
cpu_x86_load_seg_cache(env, R_CS, new_cs,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
sp = new_esp;
#ifdef TARGET_X86_64
if (env->hflags & HF_CS64_MASK) {
sp_mask = -1;
} else
#endif
{
sp_mask = get_sp_mask(ss_e2);
}
/* validate data segments */
validate_seg(env, R_ES, rpl);
validate_seg(env, R_DS, rpl);
validate_seg(env, R_FS, rpl);
validate_seg(env, R_GS, rpl);
sp += addend;
}
SET_ESP(sp, sp_mask);
env->eip = new_eip;
if (is_iret) {
/* NOTE: 'cpl' is the _old_ CPL */
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;
if (cpl <= iopl) {
eflags_mask |= IF_MASK;
}
if (shift == 0) {
eflags_mask &= 0xffff;
}
cpu_load_eflags(env, new_eflags, eflags_mask);
}
return;
return_to_vm86:
POPL(ssp, sp, sp_mask, new_esp);
POPL(ssp, sp, sp_mask, new_ss);
POPL(ssp, sp, sp_mask, new_es);
POPL(ssp, sp, sp_mask, new_ds);
POPL(ssp, sp, sp_mask, new_fs);
POPL(ssp, sp, sp_mask, new_gs);
/* modify processor state */
cpu_load_eflags(env, new_eflags, TF_MASK | AC_MASK | ID_MASK |
IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK |
VIP_MASK);
load_seg_vm(env, R_CS, new_cs & 0xffff);
load_seg_vm(env, R_SS, new_ss & 0xffff);
load_seg_vm(env, R_ES, new_es & 0xffff);
load_seg_vm(env, R_DS, new_ds & 0xffff);
load_seg_vm(env, R_FS, new_fs & 0xffff);
load_seg_vm(env, R_GS, new_gs & 0xffff);
env->eip = new_eip & 0xffff;
env->regs[R_ESP] = new_esp;
}
void helper_iret_protected(CPUX86State *env, int shift, int next_eip)
{
int tss_selector, type;
uint32_t e1, e2;
/* specific case for TSS */
if (env->eflags & NT_MASK) {
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
#endif
tss_selector = cpu_lduw_kernel(env, env->tr.base + 0);
if (tss_selector & 4) {
raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
}
if (load_segment(env, &e1, &e2, tss_selector) != 0) {
raise_exception_err(env, 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(env, EXCP0A_TSS, tss_selector & 0xfffc);
}
switch_tss(env, tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip);
} else {
helper_ret_protected(env, shift, 1, 0);
}
env->hflags2 &= ~HF2_NMI_MASK;
}
void helper_lret_protected(CPUX86State *env, int shift, int addend)
{
helper_ret_protected(env, shift, 0, addend);
}
void helper_sysenter(CPUX86State *env)
{
if (env->sysenter_cs == 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK);
#ifdef TARGET_X86_64
if (env->hflags & HF_LMA_MASK) {
cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
DESC_L_MASK);
} else
#endif
{
cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
}
cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc,
0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK |
DESC_W_MASK | DESC_A_MASK);
env->regs[R_ESP] = env->sysenter_esp;
env->eip = env->sysenter_eip;
}
void helper_sysexit(CPUX86State *env, int dflag)
{
int cpl;
cpl = env->hflags & HF_CPL_MASK;
if (env->sysenter_cs == 0 || cpl != 0) {
raise_exception_err(env, EXCP0D_GPF, 0);
}
#ifdef TARGET_X86_64
if (dflag == 2) {
cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) |
3, 0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
DESC_L_MASK);
cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) |
3, 0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
} else
#endif
{
cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) |
3, 0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) |
3, 0, 0xffffffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
DESC_W_MASK | DESC_A_MASK);
}
env->regs[R_ESP] = env->regs[R_ECX];
env->eip = env->regs[R_EDX];
}
target_ulong helper_lsl(CPUX86State *env, target_ulong selector1)
{
unsigned int limit;
uint32_t e1, e2, eflags, selector;
int rpl, dpl, cpl, type;
selector = selector1 & 0xffff;
eflags = cpu_cc_compute_all(env, CC_OP);
if ((selector & 0xfffc) == 0) {
goto fail;
}
if (load_segment(env, &e1, &e2, selector) != 0) {
goto fail;
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (e2 & DESC_S_MASK) {
if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
/* conforming */
} else {
if (dpl < cpl || dpl < rpl) {
goto fail;
}
}
} else {
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
switch (type) {
case 1:
case 2:
case 3:
case 9:
case 11:
break;
default:
goto fail;
}
if (dpl < cpl || dpl < rpl) {
fail:
CC_SRC = eflags & ~CC_Z;
return 0;
}
}
limit = get_seg_limit(e1, e2);
CC_SRC = eflags | CC_Z;
return limit;
}
target_ulong helper_lar(CPUX86State *env, target_ulong selector1)
{
uint32_t e1, e2, eflags, selector;
int rpl, dpl, cpl, type;
selector = selector1 & 0xffff;
eflags = cpu_cc_compute_all(env, CC_OP);
if ((selector & 0xfffc) == 0) {
goto fail;
}
if (load_segment(env, &e1, &e2, selector) != 0) {
goto fail;
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (e2 & DESC_S_MASK) {
if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
/* conforming */
} else {
if (dpl < cpl || dpl < rpl) {
goto fail;
}
}
} else {
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
switch (type) {
case 1:
case 2:
case 3:
case 4:
case 5:
case 9:
case 11:
case 12:
break;
default:
goto fail;
}
if (dpl < cpl || dpl < rpl) {
fail:
CC_SRC = eflags & ~CC_Z;
return 0;
}
}
CC_SRC = eflags | CC_Z;
return e2 & 0x00f0ff00;
}
void helper_verr(CPUX86State *env, target_ulong selector1)
{
uint32_t e1, e2, eflags, selector;
int rpl, dpl, cpl;
selector = selector1 & 0xffff;
eflags = cpu_cc_compute_all(env, CC_OP);
if ((selector & 0xfffc) == 0) {
goto fail;
}
if (load_segment(env, &e1, &e2, selector) != 0) {
goto fail;
}
if (!(e2 & DESC_S_MASK)) {
goto fail;
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (e2 & DESC_CS_MASK) {
if (!(e2 & DESC_R_MASK)) {
goto fail;
}
if (!(e2 & DESC_C_MASK)) {
if (dpl < cpl || dpl < rpl) {
goto fail;
}
}
} else {
if (dpl < cpl || dpl < rpl) {
fail:
CC_SRC = eflags & ~CC_Z;
return;
}
}
CC_SRC = eflags | CC_Z;
}
void helper_verw(CPUX86State *env, target_ulong selector1)
{
uint32_t e1, e2, eflags, selector;
int rpl, dpl, cpl;
selector = selector1 & 0xffff;
eflags = cpu_cc_compute_all(env, CC_OP);
if ((selector & 0xfffc) == 0) {
goto fail;
}
if (load_segment(env, &e1, &e2, selector) != 0) {
goto fail;
}
if (!(e2 & DESC_S_MASK)) {
goto fail;
}
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (e2 & DESC_CS_MASK) {
goto fail;
} else {
if (dpl < cpl || dpl < rpl) {
goto fail;
}
if (!(e2 & DESC_W_MASK)) {
fail:
CC_SRC = eflags & ~CC_Z;
return;
}
}
CC_SRC = eflags | CC_Z;
}
#if defined(CONFIG_USER_ONLY)
void cpu_x86_load_seg(CPUX86State *env, int seg_reg, int selector)
{
if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
int dpl = (env->eflags & VM_MASK) ? 3 : 0;
selector &= 0xffff;
cpu_x86_load_seg_cache(env, seg_reg, selector,
(selector << 4), 0xffff,
DESC_P_MASK | DESC_S_MASK | DESC_W_MASK |
DESC_A_MASK | (dpl << DESC_DPL_SHIFT));
} else {
helper_load_seg(env, seg_reg, selector);
}
}
#endif
/* check if Port I/O is allowed in TSS */
static inline void check_io(CPUX86State *env, int addr, int size)
{
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 = cpu_lduw_kernel(env, env->tr.base + 0x66);
io_offset += (addr >> 3);
/* Note: the check needs two bytes */
if ((io_offset + 1) > env->tr.limit) {
goto fail;
}
val = cpu_lduw_kernel(env, 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(env, EXCP0D_GPF, 0);
}
}
void helper_check_iob(CPUX86State *env, uint32_t t0)
{
check_io(env, t0, 1);
}
void helper_check_iow(CPUX86State *env, uint32_t t0)
{
check_io(env, t0, 2);
}
void helper_check_iol(CPUX86State *env, uint32_t t0)
{
check_io(env, t0, 4);
}
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