qemu: Add fix for floating point issues on x86-64
There was a bug in handling of the mxcsr register since cpu flags were not getting updated after fxrstor operations. This small tweak fixes that. [YOCTO #5248] (From OE-Core rev: 5dc43cdc08e6698afa16ba79f3506a1555bb3710) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
parent
331159d90d
commit
0fe5d9d657
|
@ -0,0 +1,31 @@
|
|||
When we restore the mxcsr resgister with FXRSTOR, we need to update the various SSE
|
||||
flag files by calling update_sse_status() else we're using the flags from some other
|
||||
process with interesting results.
|
||||
|
||||
The code isn't ordered to make this easy hence the function declaration.
|
||||
|
||||
Upstream-Status: Pending
|
||||
|
||||
RP 2013/9/30
|
||||
|
||||
Index: qemu-1.5.0/target-i386/fpu_helper.c
|
||||
===================================================================
|
||||
--- qemu-1.5.0.orig/target-i386/fpu_helper.c 2013-09-30 18:46:39.283377648 +0000
|
||||
+++ qemu-1.5.0/target-i386/fpu_helper.c 2013-09-30 18:46:56.895377232 +0000
|
||||
@@ -1149,6 +1149,8 @@
|
||||
}
|
||||
}
|
||||
|
||||
+static void update_sse_status(CPUX86State *env);
|
||||
+
|
||||
void helper_fxrstor(CPUX86State *env, target_ulong ptr, int data64)
|
||||
{
|
||||
int i, fpus, fptag, nb_xmm_regs;
|
||||
@@ -1180,6 +1182,7 @@
|
||||
if (env->cr[4] & CR4_OSFXSR_MASK) {
|
||||
/* XXX: finish it */
|
||||
env->mxcsr = cpu_ldl_data(env, ptr + 0x18);
|
||||
+ update_sse_status(env);
|
||||
/* cpu_ldl_data(env, ptr + 0x1c); */
|
||||
if (env->hflags & HF_CS64_MASK) {
|
||||
nb_xmm_regs = 16;
|
|
@ -6,6 +6,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=441c28d2cf86e15a37fa47e15a72fbac \
|
|||
SRC_URI += "file://fdt_header.patch \
|
||||
file://target-i386-Fix-aflag-logic-for-CODE64-and-the-0x67-.patch \
|
||||
file://target-ppc_fix_bit_extraction.patch \
|
||||
file://fxrstorssefix.patch \
|
||||
"
|
||||
|
||||
SRC_URI_prepend = "http://wiki.qemu.org/download/qemu-${PV}.tar.bz2"
|
||||
|
|
Loading…
Reference in New Issue