From 5dc43cdc08e6698afa16ba79f3506a1555bb3710 Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Mon, 30 Sep 2013 18:50:59 +0000 Subject: 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] Signed-off-by: Richard Purdie --- .../qemu/files/fxrstorssefix.patch | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 meta/recipes-devtools/qemu/files/fxrstorssefix.patch (limited to 'meta/recipes-devtools/qemu/files') diff --git a/meta/recipes-devtools/qemu/files/fxrstorssefix.patch b/meta/recipes-devtools/qemu/files/fxrstorssefix.patch new file mode 100644 index 0000000000..59ab0f50fa --- /dev/null +++ b/meta/recipes-devtools/qemu/files/fxrstorssefix.patch @@ -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; -- cgit v1.2.3