qemu: Backport a patch to solve SSE2 instruction emulation issues
This fix addresses various issues seen in qemux86-64 images: * scroll bars in matchbox-terminal not working * files not appearing in pcmanfm * warnings on the console from glib/gobject about invalid gdouble values Its due to an emulation issue in qemu which the backported patch fixes. I managed to debug it to a specific function, Khem found the qemu patch to backport, thanks Khem! [YOCTO #1906] (From OE-Core rev: 69d083f8b8d8f7d095ed5682d305870c4d93fe62) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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From a4d1f142542935b90d2eb30f3aead4edcf455fe6 Mon Sep 17 00:00:00 2001
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From: Aurelien Jarno <aurelien@aurel32.net>
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Date: Sat, 7 Jan 2012 15:20:11 +0100
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Subject: [PATCH 1/1] target-i386: fix {min,max}{pd,ps,sd,ss} SSE2 instructions
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minpd, minps, minsd, minss and maxpd, maxps, maxsd, maxss SSE2
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instructions have been broken when switching target-i386 to softfloat.
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It's not possible to use comparison instructions on float types anymore
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to softfloat, so use the floatXX_lt function instead, as the
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float_XX_min and float_XX_max functions can't be used due to the Intel
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specific behaviour.
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As it implements the correct NaNs behaviour, let's remove the
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corresponding entry from the TODO.
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It fixes GDM screen display on Debian Lenny.
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Thanks to Peter Maydell and Jason Wessel for their analysis of the
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problem.
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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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---
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target-i386/TODO | 1 -
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target-i386/ops_sse.h | 9 +++++++--
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2 files changed, 7 insertions(+), 3 deletions(-)
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This fixes scrollbar issues in matchbox-terminal/vte on qemux86-64 and
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files not appearing in pcmanfm, as well as glib/gobject errors to do with gdoubles
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on the console [YOCTO #1906]
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Upstream-Status: Backport
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Index: qemu-0.15.1/target-i386/TODO
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===================================================================
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--- qemu-0.15.1.orig/target-i386/TODO 2011-10-12 16:41:43.000000000 +0000
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+++ qemu-0.15.1/target-i386/TODO 2012-04-19 07:30:38.704073075 +0000
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@@ -15,7 +15,6 @@
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- DRx register support
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- CR0.AC emulation
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- SSE alignment checks
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-- fix SSE min/max with nans
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Optimizations/Features:
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Index: qemu-0.15.1/target-i386/ops_sse.h
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===================================================================
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--- qemu-0.15.1.orig/target-i386/ops_sse.h 2011-10-12 16:41:43.000000000 +0000
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+++ qemu-0.15.1/target-i386/ops_sse.h 2012-04-19 07:30:38.712073076 +0000
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@@ -584,10 +584,15 @@
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#define FPU_SUB(size, a, b) float ## size ## _sub(a, b, &env->sse_status)
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#define FPU_MUL(size, a, b) float ## size ## _mul(a, b, &env->sse_status)
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#define FPU_DIV(size, a, b) float ## size ## _div(a, b, &env->sse_status)
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-#define FPU_MIN(size, a, b) (a) < (b) ? (a) : (b)
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-#define FPU_MAX(size, a, b) (a) > (b) ? (a) : (b)
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#define FPU_SQRT(size, a, b) float ## size ## _sqrt(b, &env->sse_status)
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+/* Note that the choice of comparison op here is important to get the
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+ * special cases right: for min and max Intel specifies that (-0,0),
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+ * (NaN, anything) and (anything, NaN) return the second argument.
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+ */
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+#define FPU_MIN(size, a, b) float ## size ## _lt(a, b, &env->sse_status) ? (a) : (b)
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+#define FPU_MAX(size, a, b) float ## size ## _lt(b, a, &env->sse_status) ? (a) : (b)
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+
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SSE_HELPER_S(add, FPU_ADD)
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SSE_HELPER_S(sub, FPU_SUB)
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SSE_HELPER_S(mul, FPU_MUL)
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@ -3,7 +3,7 @@ require qemu.inc
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LIC_FILES_CHKSUM = "file://COPYING;md5=441c28d2cf86e15a37fa47e15a72fbac \
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file://COPYING.LIB;endline=24;md5=c04def7ae38850e7d3ef548588159913"
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PR = "r5"
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PR = "r6"
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FILESPATH = "${FILE_DIRNAME}/qemu-${PV}"
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FILESDIR = "${WORKDIR}"
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@ -18,6 +18,7 @@ SRC_URI = "\
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file://fallback-to-safe-mmap_min_addr.patch \
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file://larger_default_ram_size.patch \
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file://arm-bgr.patch \
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file://a4d1f142542935b90d2eb30f3aead4edcf455fe6.patch \
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"
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# Only use the GL passthrough patches for native/nativesdk versions
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