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op_helper.c
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/*
* i386 helpers
*
* 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/>.
*/
#define CPU_NO_GLOBAL_REGS
#include "exec.h"
#include "exec-all.h"
#include "host-utils.h"
//#define DEBUG_PCALL
#ifdef DEBUG_PCALL
# define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__)
# define LOG_PCALL_STATE(env) \
log_cpu_state_mask(CPU_LOG_PCALL, (env), X86_DUMP_CCOP)
#else
# define LOG_PCALL(...) do { } while (0)
# define LOG_PCALL_STATE(env) do { } while (0)
#endif
#if 0
#define raise_exception_err(a, b)\
do {\
qemu_log("raise_exception line=%d\n", __LINE__);\
(raise_exception_err)(a, b);\
} while (0)
#endif
static const uint8_t parity_table[256] = {
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
};
/* modulo 17 table */
static const uint8_t rclw_table[32] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9,10,11,12,13,14,15,
16, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9,10,11,12,13,14,
};
/* modulo 9 table */
static const uint8_t rclb_table[32] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 0, 1, 2, 3, 4, 5, 6,
7, 8, 0, 1, 2, 3, 4, 5,
6, 7, 8, 0, 1, 2, 3, 4,
};
static const CPU86_LDouble f15rk[7] =
{
0.00000000000000000000L,
1.00000000000000000000L,
3.14159265358979323851L, /*pi*/
0.30102999566398119523L, /*lg2*/
0.69314718055994530943L, /*ln2*/
1.44269504088896340739L, /*l2e*/
3.32192809488736234781L, /*l2t*/
};
/* broken thread support */
static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
void helper_lock(void)
{
spin_lock(&global_cpu_lock);
}
void helper_unlock(void)
{
spin_unlock(&global_cpu_lock);
}
void helper_write_eflags(target_ulong t0, uint32_t update_mask)
{
load_eflags(t0, update_mask);
}
target_ulong helper_read_eflags(void)
{
uint32_t eflags;
eflags = helper_cc_compute_all(CC_OP);
eflags |= (DF & DF_MASK);
eflags |= env->eflags & ~(VM_MASK | RF_MASK);
return eflags;
}
/* return non zero if error */
static inline int load_segment(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 = ldl_kernel(ptr);
*e2_ptr = ldl_kernel(ptr + 4);
return 0;
}
static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
{
unsigned int limit;
limit = (e1 & 0xffff) | (e2 & 0x000f0000);
if (e2 & DESC_G_MASK)
limit = (limit << 12) | 0xfff;
return limit;
}
static inline 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(int seg, int selector)
{
selector &= 0xffff;
cpu_x86_load_seg_cache(env, seg, selector,
(selector << 4), 0xffff, 0);
}
static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
uint32_t *esp_ptr, int dpl)
{
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(env, "invalid tss");
type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
if ((type & 7) != 1)
cpu_abort(env, "invalid tss type");
shift = type >> 3;
index = (dpl * 4 + 2) << shift;
if (index + (4 << shift) - 1 > env->tr.limit)
raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
if (shift == 0) {
*esp_ptr = lduw_kernel(env->tr.base + index);
*ss_ptr = lduw_kernel(env->tr.base + index + 2);
} else {
*esp_ptr = ldl_kernel(env->tr.base + index);
*ss_ptr = lduw_kernel(env->tr.base + index + 4);
}
}
/* XXX: merge with load_seg() */
static void tss_load_seg(int seg_reg, int selector)
{
uint32_t e1, e2;
int rpl, dpl, cpl;
if ((selector & 0xfffc) != 0) {
if (load_segment(&e1, &e2, selector) != 0)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
if (!(e2 & DESC_S_MASK))
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
rpl = selector & 3;
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
cpl = env->hflags & HF_CPL_MASK;
if (seg_reg == R_CS) {
if (!(e2 & DESC_CS_MASK))
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
/* XXX: is it correct ? */
if (dpl != rpl)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
if ((e2 & DESC_C_MASK) && dpl > rpl)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
} else if (seg_reg == R_SS) {
/* SS must be writable data */
if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
if (dpl != cpl || dpl != rpl)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
} else {
/* not readable code */
if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK))
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
/* if data or non conforming code, checks the rights */
if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
if (dpl < cpl || dpl < rpl)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
}
}
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
cpu_x86_load_seg_cache(env, seg_reg, selector,
get_seg_base(e1, e2),
get_seg_limit(e1, e2),
e2);
} else {
if (seg_reg == R_SS || seg_reg == R_CS)
raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
}
}
#define SWITCH_TSS_JMP 0
#define SWITCH_TSS_IRET 1
#define SWITCH_TSS_CALL 2
/* XXX: restore CPU state in registers (PowerPC case) */
static void switch_tss(int tss_selector,
uint32_t e1, uint32_t e2, int source,
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(EXCP0B_NOSEG, tss_selector & 0xfffc);
tss_selector = e1 >> 16;
if (tss_selector & 4)
raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
if (load_segment(&e1, &e2, tss_selector) != 0)
raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
if (e2 & DESC_S_MASK)
raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
if ((type & 7) != 1)
raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
}
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
if (type & 8)
tss_limit_max = 103;
else
tss_limit_max = 43;
tss_limit = get_seg_limit(e1, e2);
tss_base = get_seg_base(e1, e2);
if ((tss_selector & 4) != 0 ||
tss_limit < tss_limit_max)
raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
if (old_type & 8)
old_tss_limit_max = 103;
else
old_tss_limit_max = 43;
/* read all the registers from the new TSS */
if (type & 8) {
/* 32 bit */
new_cr3 = ldl_kernel(tss_base + 0x1c);
new_eip = ldl_kernel(tss_base + 0x20);
new_eflags = ldl_kernel(tss_base + 0x24);
for(i = 0; i < 8; i++)
new_regs[i] = ldl_kernel(tss_base + (0x28 + i * 4));
for(i = 0; i < 6; i++)
new_segs[i] = lduw_kernel(tss_base + (0x48 + i * 4));
new_ldt = lduw_kernel(tss_base + 0x60);
new_trap = ldl_kernel(tss_base + 0x64);
} else {
/* 16 bit */
new_cr3 = 0;
new_eip = lduw_kernel(tss_base + 0x0e);
new_eflags = lduw_kernel(tss_base + 0x10);
for(i = 0; i < 8; i++)
new_regs[i] = lduw_kernel(tss_base + (0x12 + i * 2)) | 0xffff0000;
for(i = 0; i < 4; i++)
new_segs[i] = lduw_kernel(tss_base + (0x22 + i * 4));
new_ldt = lduw_kernel(tss_base + 0x2a);
new_segs[R_FS] = 0;
new_segs[R_GS] = 0;
new_trap = 0;
}
/* NOTE: we must avoid memory exceptions during the task switch,
so we make dummy accesses before */
/* XXX: it can still fail in some cases, so a bigger hack is
necessary to valid the TLB after having done the accesses */
v1 = ldub_kernel(env->tr.base);
v2 = ldub_kernel(env->tr.base + old_tss_limit_max);
stb_kernel(env->tr.base, v1);
stb_kernel(env->tr.base + old_tss_limit_max, v2);
/* clear busy bit (it is restartable) */
if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
target_ulong ptr;
uint32_t e2;
ptr = env->gdt.base + (env->tr.selector & ~7);
e2 = ldl_kernel(ptr + 4);
e2 &= ~DESC_TSS_BUSY_MASK;
stl_kernel(ptr + 4, e2);
}
old_eflags = compute_eflags();
if (source == SWITCH_TSS_IRET)
old_eflags &= ~NT_MASK;
/* save the current state in the old TSS */
if (type & 8) {
/* 32 bit */
stl_kernel(env->tr.base + 0x20, next_eip);
stl_kernel(env->tr.base + 0x24, old_eflags);
stl_kernel(env->tr.base + (0x28 + 0 * 4), EAX);
stl_kernel(env->tr.base + (0x28 + 1 * 4), ECX);
stl_kernel(env->tr.base + (0x28 + 2 * 4), EDX);
stl_kernel(env->tr.base + (0x28 + 3 * 4), EBX);
stl_kernel(env->tr.base + (0x28 + 4 * 4), ESP);
stl_kernel(env->tr.base + (0x28 + 5 * 4), EBP);
stl_kernel(env->tr.base + (0x28 + 6 * 4), ESI);
stl_kernel(env->tr.base + (0x28 + 7 * 4), EDI);
for(i = 0; i < 6; i++)
stw_kernel(env->tr.base + (0x48 + i * 4), env->segs[i].selector);
} else {
/* 16 bit */
stw_kernel(env->tr.base + 0x0e, next_eip);
stw_kernel(env->tr.base + 0x10, old_eflags);
stw_kernel(env->tr.base + (0x12 + 0 * 2), EAX);
stw_kernel(env->tr.base + (0x12 + 1 * 2), ECX);
stw_kernel(env->tr.base + (0x12 + 2 * 2), EDX);
stw_kernel(env->tr.base + (0x12 + 3 * 2), EBX);
stw_kernel(env->tr.base + (0x12 + 4 * 2), ESP);
stw_kernel(env->tr.base + (0x12 + 5 * 2), EBP);
stw_kernel(env->tr.base + (0x12 + 6 * 2), ESI);
stw_kernel(env->tr.base + (0x12 + 7 * 2), EDI);
for(i = 0; i < 4; i++)
stw_kernel(env->tr.base + (0x22 + i * 4), env->segs[i].selector);
}
/* now if an exception occurs, it will occurs in the next task
context */
if (source == SWITCH_TSS_CALL) {
stw_kernel(tss_base, env->tr.selector);
new_eflags |= NT_MASK;
}
/* set busy bit */
if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
target_ulong ptr;
uint32_t e2;
ptr = env->gdt.base + (tss_selector & ~7);
e2 = ldl_kernel(ptr + 4);
e2 |= DESC_TSS_BUSY_MASK;
stl_kernel(ptr + 4, e2);
}
/* set the new CPU state */
/* from this point, any exception which occurs can give problems */
env->cr[0] |= CR0_TS_MASK;
env->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;
load_eflags(new_eflags, eflags_mask);
/* XXX: what to do in 16 bit case ? */
EAX = new_regs[0];
ECX = new_regs[1];
EDX = new_regs[2];
EBX = new_regs[3];
ESP = new_regs[4];
EBP = new_regs[5];
ESI = new_regs[6];
EDI = new_regs[7];
if (new_eflags & VM_MASK) {
for(i = 0; i < 6; i++)
load_seg_vm(i, new_segs[i]);
/* in vm86, CPL is always 3 */
cpu_x86_set_cpl(env, 3);
} else {
/* CPL is set the RPL of CS */
cpu_x86_set_cpl(env, new_segs[R_CS] & 3);
/* first just selectors as the rest may trigger exceptions */
for(i = 0; i < 6; i++)
cpu_x86_load_seg_cache(env, i, new_segs[i], 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(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(EXCP0A_TSS, new_ldt & 0xfffc);
ptr = dt->base + index;
e1 = ldl_kernel(ptr);
e2 = ldl_kernel(ptr + 4);
if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
load_seg_cache_raw_dt(&env->ldt, e1, e2);
}
/* load the segments */
if (!(new_eflags & VM_MASK)) {
tss_load_seg(R_CS, new_segs[R_CS]);
tss_load_seg(R_SS, new_segs[R_SS]);
tss_load_seg(R_ES, new_segs[R_ES]);
tss_load_seg(R_DS, new_segs[R_DS]);
tss_load_seg(R_FS, new_segs[R_FS]);
tss_load_seg(R_GS, new_segs[R_GS]);
}
/* check that EIP is in the CS segment limits */
if (new_eip > env->segs[R_CS].limit) {
/* XXX: different exception if CALL ? */
raise_exception_err(EXCP0D_GPF, 0);
}
#ifndef CONFIG_USER_ONLY
/* reset local breakpoints */
if (env->dr[7] & 0x55) {
for (i = 0; i < 4; i++) {
if (hw_breakpoint_enabled(env->dr[7], i) == 0x1)
hw_breakpoint_remove(env, i);
}
env->dr[7] &= ~0x55;
}
#endif
}
/* check if Port I/O is allowed in TSS */
static inline void check_io(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 = lduw_kernel(env->tr.base + 0x66);
io_offset += (addr >> 3);
/* Note: the check needs two bytes */
if ((io_offset + 1) > env->tr.limit)
goto fail;
val = lduw_kernel(env->tr.base + io_offset);
val >>= (addr & 7);
mask = (1 << size) - 1;
/* all bits must be zero to allow the I/O */
if ((val & mask) != 0) {
fail:
raise_exception_err(EXCP0D_GPF, 0);
}
}
void helper_check_iob(uint32_t t0)
{
check_io(t0, 1);
}
void helper_check_iow(uint32_t t0)
{
check_io(t0, 2);
}
void helper_check_iol(uint32_t t0)
{
check_io(t0, 4);
}
void helper_outb(uint32_t port, uint32_t data)
{
cpu_outb(env, port, data & 0xff);
}
target_ulong helper_inb(uint32_t port)
{
return cpu_inb(env, port);
}
void helper_outw(uint32_t port, uint32_t data)
{
cpu_outw(env, port, data & 0xffff);
}
target_ulong helper_inw(uint32_t port)
{
return cpu_inw(env, port);
}
void helper_outl(uint32_t port, uint32_t data)
{
cpu_outl(env, port, data);
}
target_ulong helper_inl(uint32_t port)
{
return cpu_inl(env, port);
}
static inline unsigned int get_sp_mask(unsigned int e2)
{
if (e2 & DESC_B_MASK)
return 0xffffffff;
else
return 0xffff;
}
static int exeption_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)\
ESP = (ESP & ~0xffff) | ((val) & 0xffff);\
else if ((sp_mask) == 0xffffffffLL)\
ESP = (uint32_t)(val);\
else\
ESP = (val);\
} while (0)
#else
#define SET_ESP(val, sp_mask) ESP = (ESP & ~(sp_mask)) | ((val) & (sp_mask))
#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;\
stw_kernel((ssp) + (sp & (sp_mask)), (val));\
}
#define PUSHL(ssp, sp, sp_mask, val)\
{\
sp -= 4;\
stl_kernel(SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val));\
}
#define POPW(ssp, sp, sp_mask, val)\
{\
val = lduw_kernel((ssp) + (sp & (sp_mask)));\
sp += 2;\
}
#define POPL(ssp, sp, sp_mask, val)\
{\
val = (uint32_t)ldl_kernel(SEG_ADDL(ssp, sp, sp_mask));\
sp += 4;\
}
/* protected mode interrupt */
static void do_interrupt_protected(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;
has_error_code = 0;
if (!is_int && !is_hw)
has_error_code = exeption_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(EXCP0D_GPF, intno * 8 + 2);
ptr = dt->base + intno * 8;
e1 = ldl_kernel(ptr);
e2 = ldl_kernel(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(EXCP0B_NOSEG, intno * 8 + 2);
switch_tss(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 = (ESP - (2 << shift)) & mask;
ssp = env->segs[R_SS].base + esp;
if (shift)
stl_kernel(ssp, error_code);
else
stw_kernel(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(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(EXCP0D_GPF, intno * 8 + 2);
/* check valid bit */
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2);
selector = e1 >> 16;
offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
if ((selector & 0xfffc) == 0)
raise_exception_err(EXCP0D_GPF, 0);
if (load_segment(&e1, &e2, selector) != 0)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
if (!(e2 & DESC_C_MASK) && dpl < cpl) {
/* to inner privilege */
get_ss_esp_from_tss(&ss, &esp, dpl);
if ((ss & 0xfffc) == 0)
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
if ((ss & 3) != dpl)
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
if (load_segment(&ss_e1, &ss_e2, ss) != 0)
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
if (ss_dpl != dpl)
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
if (!(ss_e2 & DESC_S_MASK) ||
(ss_e2 & DESC_CS_MASK) ||
!(ss_e2 & DESC_W_MASK))
raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
if (!(ss_e2 & DESC_P_MASK))
raise_exception_err(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 (env->eflags & VM_MASK)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
new_stack = 0;
sp_mask = get_sp_mask(env->segs[R_SS].flags);
ssp = env->segs[R_SS].base;
esp = ESP;
dpl = cpl;
} else {
raise_exception_err(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 (env->eflags & VM_MASK)
push_size += 8;
push_size <<= shift;
#endif
if (shift == 1) {
if (new_stack) {
if (env->eflags & VM_MASK) {
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, ESP);
}
PUSHL(ssp, esp, sp_mask, compute_eflags());
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 (env->eflags & VM_MASK) {
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, ESP);
}
PUSHW(ssp, esp, sp_mask, compute_eflags());
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);
}
}
if (new_stack) {
if (env->eflags & VM_MASK) {
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);
cpu_x86_set_cpl(env, dpl);
env->eip = offset;
/* interrupt gate clear IF mask */
if ((type & 1) == 0) {
env->eflags &= ~IF_MASK;
}
env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
}
#ifdef TARGET_X86_64
#define PUSHQ(sp, val)\
{\
sp -= 8;\
stq_kernel(sp, (val));\
}
#define POPQ(sp, val)\
{\
val = ldq_kernel(sp);\
sp += 8;\
}
static inline target_ulong get_rsp_from_tss(int level)
{
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(env, "invalid tss");
index = 8 * level + 4;
if ((index + 7) > env->tr.limit)
raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
return ldq_kernel(env->tr.base + index);
}
/* 64 bit interrupt */
static void do_interrupt64(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 = exeption_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(EXCP0D_GPF, intno * 16 + 2);
ptr = dt->base + intno * 16;
e1 = ldl_kernel(ptr);
e2 = ldl_kernel(ptr + 4);
e3 = ldl_kernel(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(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(EXCP0D_GPF, intno * 16 + 2);
/* check valid bit */
if (!(e2 & DESC_P_MASK))
raise_exception_err(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(EXCP0D_GPF, 0);
if (load_segment(&e1, &e2, selector) != 0)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
dpl = (e2 >> DESC_DPL_SHIFT) & 3;
if (dpl > cpl)
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if (!(e2 & DESC_P_MASK))
raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK))
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) {
/* to inner privilege */
if (ist != 0)
esp = get_rsp_from_tss(ist + 3);
else
esp = get_rsp_from_tss(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(EXCP0D_GPF, selector & 0xfffc);
new_stack = 0;
if (ist != 0)
esp = get_rsp_from_tss(ist + 3);
else
esp = ESP;
esp &= ~0xfLL; /* align stack */
dpl = cpl;
} else {
raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
new_stack = 0; /* avoid warning */
esp = 0; /* avoid warning */
}
PUSHQ(esp, env->segs[R_SS].selector);
PUSHQ(esp, ESP);
PUSHQ(esp, compute_eflags());
PUSHQ(esp, env->segs[R_CS].selector);
PUSHQ(esp, old_eip);
if (has_error_code) {
PUSHQ(esp, error_code);
}
if (new_stack) {
ss = 0 | dpl;
cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0);
}
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);
cpu_x86_set_cpl(env, dpl);
env->eip = offset;
/* interrupt gate clear IF mask */
if ((type & 1) == 0) {
env->eflags &= ~IF_MASK;
}
env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
}
#endif
#ifdef TARGET_X86_64
#if defined(CONFIG_USER_ONLY)
void helper_syscall(int next_eip_addend)