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target-i386: Split fxsave/fxrstor implementation

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We will be able to reuse these pieces for XSAVE/XRSTOR.

Backports commit 64dbaff09bb768dbbb13142862554f18ab642866 from qemu
This commit is contained in:
Richard Henderson 2018-02-20 11:56:33 -05:00 committed by Lioncash
parent a4bf026460
commit b490486028
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 103 additions and 85 deletions
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180
qemu/target-i386/fpu_helper.c
View file

@ -1144,90 +1144,89 @@ void cpu_x86_frstor(CPUX86State *env, target_ulong ptr, int data32)
}
#endif
static void do_fxsave(CPUX86State *env, target_ulong ptr, int data64,
uintptr_t retaddr)
static void do_xsave_fpu(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
int fpus, fptag, i, nb_xmm_regs;
floatx80 tmp;
int fpus, fptag, i;
target_ulong addr;
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception_ra(env, EXCP0D_GPF, retaddr);
}
fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
fptag = 0;
for (i = 0; i < 8; i++) {
fptag |= (env->fptags[i] << i);
}
cpu_stw_data_ra(env, ptr, env->fpuc, retaddr);
cpu_stw_data_ra(env, ptr + 2, fpus, retaddr);
cpu_stw_data_ra(env, ptr + 4, fptag ^ 0xff, retaddr);
#ifdef TARGET_X86_64
if (data64) {
cpu_stq_data_ra(env, ptr + 0x08, 0, retaddr); /* rip */
cpu_stq_data_ra(env, ptr + 0x10, 0, retaddr); /* rdp */
} else
#endif
{
cpu_stl_data_ra(env, ptr + 0x08, 0, retaddr); /* eip */
cpu_stl_data_ra(env, ptr + 0x0c, 0, retaddr); /* sel */
cpu_stl_data_ra(env, ptr + 0x10, 0, retaddr); /* dp */
cpu_stl_data_ra(env, ptr + 0x14, 0, retaddr); /* sel */
}
cpu_stw_data_ra(env, ptr, env->fpuc, ra);
cpu_stw_data_ra(env, ptr + 2, fpus, ra);
cpu_stw_data_ra(env, ptr + 4, fptag ^ 0xff, ra);
/* In 32-bit mode this is eip, sel, dp, sel.
In 64-bit mode this is rip, rdp.
But in either case we don't write actual data, just zeros. */
cpu_stq_data_ra(env, ptr + 0x08, 0, ra); /* eip+sel; rip */
cpu_stq_data_ra(env, ptr + 0x10, 0, ra); /* edp+sel; rdp */
addr = ptr + 0x20;
for (i = 0; i < 8; i++) {
tmp = ST(i);
helper_fstt(env, tmp, addr, retaddr);
floatx80 tmp = ST(i);
helper_fstt(env, tmp, addr, ra);
addr += 16;
}
}
static void do_xsave_mxcsr(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
cpu_stl_data_ra(env, ptr + 0x18, env->mxcsr, ra); /* mxcsr */
cpu_stl_data_ra(env, ptr + 0x1c, 0x0000ffff, ra); /* mxcsr_mask */
}
static void do_xsave_sse(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
int i, nb_xmm_regs;
target_ulong addr;
if (env->hflags & HF_CS64_MASK) {
nb_xmm_regs = 16;
} else {
nb_xmm_regs = 8;
}
addr = ptr + 0xa0;
for (i = 0; i < nb_xmm_regs; i++) {
cpu_stq_data_ra(env, addr, env->xmm_regs[i].ZMM_Q(0), ra);
cpu_stq_data_ra(env, addr + 8, env->xmm_regs[i].ZMM_Q(1), ra);
addr += 16;
}
}
void helper_fxsave(CPUX86State *env, target_ulong ptr)
{
uintptr_t ra = GETPC();
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception_ra(env, EXCP0D_GPF, ra);
}
do_xsave_fpu(env, ptr, ra);
if (env->cr[4] & CR4_OSFXSR_MASK) {
/* XXX: finish it */
cpu_stl_data_ra(env, ptr + 0x18, env->mxcsr, retaddr); /* mxcsr */
cpu_stl_data_ra(env, ptr + 0x1c, 0x0000ffff, retaddr); /* mxcsr_mask */
if (env->hflags & HF_CS64_MASK) {
nb_xmm_regs = 16;
} else {
nb_xmm_regs = 8;
}
addr = ptr + 0xa0;
do_xsave_mxcsr(env, ptr, ra);
/* Fast FXSAVE leaves out the XMM registers */
if (!(env->efer & MSR_EFER_FFXSR)
|| (env->hflags & HF_CPL_MASK)
|| !(env->hflags & HF_LMA_MASK)) {
for (i = 0; i < nb_xmm_regs; i++) {
cpu_stq_data_ra(env, addr, env->xmm_regs[i].ZMM_Q(0), retaddr);
cpu_stq_data_ra(env, addr + 8, env->xmm_regs[i].ZMM_Q(1), retaddr);
addr += 16;
}
do_xsave_sse(env, ptr, ra);
}
}
}
void helper_fxsave(CPUX86State *env, target_ulong ptr, int data64)
static void do_xrstor_fpu(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
do_fxsave(env, ptr, data64, GETPC());
}
static void do_fxrstor(CPUX86State *env, target_ulong ptr, int data64,
uintptr_t retaddr)
{
int i, fpus, fptag, nb_xmm_regs;
floatx80 tmp;
int i, fpus, fptag;
target_ulong addr;
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception_ra(env, EXCP0D_GPF, retaddr);
}
cpu_set_fpuc(env, cpu_lduw_data_ra(env, ptr, retaddr));
fpus = cpu_lduw_data_ra(env, ptr + 2, retaddr);
fptag = cpu_lduw_data_ra(env, ptr + 4, retaddr);
cpu_set_fpuc(env, cpu_lduw_data_ra(env, ptr, ra));
fpus = cpu_lduw_data_ra(env, ptr + 2, ra);
fptag = cpu_lduw_data_ra(env, ptr + 4, ra);
env->fpstt = (fpus >> 11) & 7;
env->fpus = fpus & ~0x3800;
fptag ^= 0xff;
@ -1237,37 +1236,56 @@ static void do_fxrstor(CPUX86State *env, target_ulong ptr, int data64,
addr = ptr + 0x20;
for (i = 0; i < 8; i++) {
tmp = helper_fldt(env, addr, retaddr);
floatx80 tmp = helper_fldt(env, addr, ra);
ST(i) = tmp;
addr += 16;
}
}
if (env->cr[4] & CR4_OSFXSR_MASK) {
/* XXX: finish it */
cpu_set_mxcsr(env, cpu_ldl_data_ra(env, ptr + 0x18, retaddr));
/* cpu_ldl_data_ra(env, ptr + 0x1c, retaddr); */
if (env->hflags & HF_CS64_MASK) {
nb_xmm_regs = 16;
} else {
nb_xmm_regs = 8;
}
addr = ptr + 0xa0;
/* Fast FXRESTORE leaves out the XMM registers */
if (!(env->efer & MSR_EFER_FFXSR)
|| (env->hflags & HF_CPL_MASK)
|| !(env->hflags & HF_LMA_MASK)) {
for (i = 0; i < nb_xmm_regs; i++) {
env->xmm_regs[i].ZMM_Q(0) = cpu_ldq_data_ra(env, addr, retaddr);
env->xmm_regs[i].ZMM_Q(1) = cpu_ldq_data_ra(env, addr + 8, retaddr);
addr += 16;
}
}
static void do_xrstor_mxcsr(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
cpu_set_mxcsr(env, cpu_ldl_data_ra(env, ptr + 0x18, ra));
}
static void do_xrstor_sse(CPUX86State *env, target_ulong ptr, uintptr_t ra)
{
int i, nb_xmm_regs;
target_ulong addr;
if (env->hflags & HF_CS64_MASK) {
nb_xmm_regs = 16;
} else {
nb_xmm_regs = 8;
}
addr = ptr + 0xa0;
for (i = 0; i < nb_xmm_regs; i++) {
env->xmm_regs[i].ZMM_Q(0) = cpu_ldq_data_ra(env, addr, ra);
env->xmm_regs[i].ZMM_Q(1) = cpu_ldq_data_ra(env, addr + 8, ra);
addr += 16;
}
}
void helper_fxrstor(CPUX86State *env, target_ulong ptr, int data64)
void helper_fxrstor(CPUX86State *env, target_ulong ptr)
{
do_fxrstor(env, ptr, data64, GETPC());
uintptr_t ra = GETPC();
/* The operand must be 16 byte aligned */
if (ptr & 0xf) {
raise_exception_ra(env, EXCP0D_GPF, ra);
}
do_xrstor_fpu(env, ptr, ra);
if (env->cr[4] & CR4_OSFXSR_MASK) {
do_xrstor_mxcsr(env, ptr, ra);
/* Fast FXRSTOR leaves out the XMM registers */
if (!(env->efer & MSR_EFER_FFXSR)
|| (env->hflags & HF_CPL_MASK)
|| !(env->hflags & HF_LMA_MASK)) {
do_xrstor_sse(env, ptr, ra);
}
}
}
void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, floatx80 f)

4
qemu/target-i386/helper.h
View file

@ -187,8 +187,8 @@ DEF_HELPER_3(fstenv, void, env, tl, int)
DEF_HELPER_3(fldenv, void, env, tl, int)
DEF_HELPER_3(fsave, void, env, tl, int)
DEF_HELPER_3(frstor, void, env, tl, int)
DEF_HELPER_3(fxsave, void, env, tl, int)
DEF_HELPER_3(fxrstor, void, env, tl, int)
DEF_HELPER_FLAGS_2(fxsave, TCG_CALL_NO_WG, void, env, tl)
DEF_HELPER_FLAGS_2(fxrstor, TCG_CALL_NO_WG, void, env, tl)
DEF_HELPER_FLAGS_1(clz_x86, TCG_CALL_NO_RWG_SE, tl, tl)

4
qemu/target-i386/translate.c
View file

@ -8160,7 +8160,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_lea_modrm(env, s, modrm);
gen_update_cc_op(s);
gen_jmp_im(s, pc_start - s->cs_base);
gen_helper_fxsave(tcg_ctx, cpu_env, cpu_A0, tcg_const_i32(tcg_ctx, dflag == MO_64));
gen_helper_fxsave(tcg_ctx, cpu_env, cpu_A0);
break;
case 1: /* fxrstor */
if (mod == 3 || !(s->cpuid_features & CPUID_FXSR) ||
@ -8173,7 +8173,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_lea_modrm(env, s, modrm);
gen_update_cc_op(s);
gen_jmp_im(s, pc_start - s->cs_base);
gen_helper_fxrstor(tcg_ctx, cpu_env, cpu_A0, tcg_const_i32(tcg_ctx, dflag == MO_64));
gen_helper_fxrstor(tcg_ctx, cpu_env, cpu_A0);
break;
case 2: /* ldmxcsr */
case 3: /* stmxcsr */