MMX/SSE support
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1205 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/vl.c b/vl.c
index 7a47624..fe873ba 100644
--- a/vl.c
+++ b/vl.c
@@ -2082,15 +2082,14 @@
void cpu_save(QEMUFile *f, void *opaque)
{
CPUState *env = opaque;
- uint16_t fptag, fpus, fpuc;
+ uint16_t fptag, fpus, fpuc, fpregs_format;
uint32_t hflags;
int i;
-
+
for(i = 0; i < CPU_NB_REGS; i++)
qemu_put_betls(f, &env->regs[i]);
qemu_put_betls(f, &env->eip);
qemu_put_betls(f, &env->eflags);
- qemu_put_betl(f, 0); /* XXX: suppress that */
hflags = env->hflags; /* XXX: suppress most of the redundant hflags */
qemu_put_be32s(f, &hflags);
@@ -2098,23 +2097,37 @@
fpuc = env->fpuc;
fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
fptag = 0;
- for (i=7; i>=0; i--) {
- fptag <<= 2;
- if (env->fptags[i]) {
- fptag |= 3;
- }
+ for(i = 0; i < 8; i++) {
+ fptag |= ((!env->fptags[i]) << i);
}
qemu_put_be16s(f, &fpuc);
qemu_put_be16s(f, &fpus);
qemu_put_be16s(f, &fptag);
+#ifdef USE_X86LDOUBLE
+ fpregs_format = 0;
+#else
+ fpregs_format = 1;
+#endif
+ qemu_put_be16s(f, &fpregs_format);
+
for(i = 0; i < 8; i++) {
uint64_t mant;
uint16_t exp;
- cpu_get_fp80(&mant, &exp, env->fpregs[i]);
+#ifdef USE_X86LDOUBLE
+ /* we save the real CPU data (in case of MMX usage only 'mant'
+ contains the MMX register */
+ cpu_get_fp80(&mant, &exp, env->fpregs[i].d);
qemu_put_be64(f, mant);
qemu_put_be16(f, exp);
+#else
+ /* if we use doubles for float emulation, we save the doubles to
+ avoid losing information in case of MMX usage. It can give
+ problems if the image is restored on a CPU where long
+ doubles are used instead. */
+ qemu_put_be64(f, env->fpregs[i].xmm.MMX_Q(0));
+#endif
}
for(i = 0; i < 6; i++)
@@ -2139,12 +2152,14 @@
/* MMU */
qemu_put_be32s(f, &env->a20_mask);
-#ifdef TARGET_X86_64
+ /* XMM */
+ qemu_put_be32s(f, &env->mxcsr);
for(i = 0; i < CPU_NB_REGS; i++) {
qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(0));
qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(1));
}
+#ifdef TARGET_X86_64
qemu_put_be64s(f, &env->efer);
qemu_put_be64s(f, &env->star);
qemu_put_be64s(f, &env->lstar);
@@ -2154,40 +2169,97 @@
#endif
}
+/* XXX: add that in a FPU generic layer */
+union x86_longdouble {
+ uint64_t mant;
+ uint16_t exp;
+};
+
+#define MANTD1(fp) (fp & ((1LL << 52) - 1))
+#define EXPBIAS1 1023
+#define EXPD1(fp) ((fp >> 52) & 0x7FF)
+#define SIGND1(fp) ((fp >> 32) & 0x80000000)
+
+static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)
+{
+ int e;
+ /* mantissa */
+ p->mant = (MANTD1(temp) << 11) | (1LL << 63);
+ /* exponent + sign */
+ e = EXPD1(temp) - EXPBIAS1 + 16383;
+ e |= SIGND1(temp) >> 16;
+ p->exp = e;
+}
+
int cpu_load(QEMUFile *f, void *opaque, int version_id)
{
CPUState *env = opaque;
- int i;
+ int i, guess_mmx;
uint32_t hflags;
- uint16_t fpus, fpuc, fptag;
+ uint16_t fpus, fpuc, fptag, fpregs_format;
- if (version_id != 2)
+ if (version_id != 3)
return -EINVAL;
for(i = 0; i < CPU_NB_REGS; i++)
qemu_get_betls(f, &env->regs[i]);
qemu_get_betls(f, &env->eip);
qemu_get_betls(f, &env->eflags);
- qemu_get_betl(f); /* XXX: suppress that */
qemu_get_be32s(f, &hflags);
qemu_get_be16s(f, &fpuc);
qemu_get_be16s(f, &fpus);
qemu_get_be16s(f, &fptag);
-
+ qemu_get_be16s(f, &fpregs_format);
+
+ /* NOTE: we cannot always restore the FPU state if the image come
+ from a host with a different 'USE_X86LDOUBLE' define. We guess
+ if we are in an MMX state to restore correctly in that case. */
+ guess_mmx = ((fptag == 0xff) && (fpus & 0x3800) == 0);
for(i = 0; i < 8; i++) {
uint64_t mant;
uint16_t exp;
- mant = qemu_get_be64(f);
- exp = qemu_get_be16(f);
- env->fpregs[i] = cpu_set_fp80(mant, exp);
+ union x86_longdouble *p;
+
+ switch(fpregs_format) {
+ case 0:
+ mant = qemu_get_be64(f);
+ exp = qemu_get_be16(f);
+#ifdef USE_X86LDOUBLE
+ env->fpregs[i].d = cpu_set_fp80(mant, exp);
+#else
+ /* difficult case */
+ if (guess_mmx)
+ env->fpregs[i].xmm.MMX_Q(0) = mant;
+ else
+ env->fpregs[i].d = cpu_set_fp80(mant, exp);
+#endif
+ break;
+ case 1:
+ mant = qemu_get_be64(f);
+#ifdef USE_X86LDOUBLE
+ /* difficult case */
+ p = (void *)&env->fpregs[i];
+ if (guess_mmx) {
+ p->mant = mant;
+ p->exp = 0xffff;
+ } else {
+ fp64_to_fp80(p, mant);
+ }
+#else
+ env->fpregs[i].xmm.MMX_Q(0) = mant;
+#endif
+ break;
+ default:
+ return -EINVAL;
+ }
}
env->fpuc = fpuc;
env->fpstt = (fpus >> 11) & 7;
env->fpus = fpus & ~0x3800;
+ fptag ^= 0xff;
for(i = 0; i < 8; i++) {
- env->fptags[i] = ((fptag & 3) == 3);
- fptag >>= 2;
+ env->fptags[i] = (fptag >> i) & 1;
}
for(i = 0; i < 6; i++)
@@ -2212,12 +2284,13 @@
/* MMU */
qemu_get_be32s(f, &env->a20_mask);
-#ifdef TARGET_X86_64
+ qemu_get_be32s(f, &env->mxcsr);
for(i = 0; i < CPU_NB_REGS; i++) {
qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(0));
qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(1));
}
+#ifdef TARGET_X86_64
qemu_get_be64s(f, &env->efer);
qemu_get_be64s(f, &env->star);
qemu_get_be64s(f, &env->lstar);
@@ -3433,7 +3506,7 @@
cpu_single_env = env;
register_savevm("timer", 0, 1, timer_save, timer_load, env);
- register_savevm("cpu", 0, 2, cpu_save, cpu_load, env);
+ register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
register_savevm("ram", 0, 1, ram_save, ram_load, NULL);
qemu_register_reset(main_cpu_reset, global_env);
