diff options
Diffstat (limited to 'yocto-poky/meta/recipes-graphics/xorg-lib/pixman/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch')
| -rw-r--r-- | yocto-poky/meta/recipes-graphics/xorg-lib/pixman/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/yocto-poky/meta/recipes-graphics/xorg-lib/pixman/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch b/yocto-poky/meta/recipes-graphics/xorg-lib/pixman/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch new file mode 100644 index 000000000..4569dca01 --- /dev/null +++ b/yocto-poky/meta/recipes-graphics/xorg-lib/pixman/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch @@ -0,0 +1,144 @@ +From a0f53e1dbb3851bb0f0efcfdbd565b05e4be9cac Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Andreas=20M=C3=BCller?= <schnitzeltony@googlemail.com> +Date: Thu, 23 Aug 2012 18:10:57 +0200 +Subject: [PATCH 1/2] ARM: qemu related workarounds in cpu features detection + code +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This was ported from meta-oe's patch [1]. The original pixman patch is found +at [2]. + +[1] http://cgit.openembedded.org/meta-openembedded/tree/meta-oe/recipes-graphics/xorg-lib/pixman-0.26.2/0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch +[2] http://lists.freedesktop.org/archives/pixman/2011-January/000906.html + +Upstream-Status: Inappropriate [other] qemu fix + +Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com> +--- + pixman/pixman-arm.c | 82 ++++++++++++++++++++++++++++++++++++++++---------- + 1 files changed, 65 insertions(+), 17 deletions(-) + +diff --git a/pixman/pixman-arm.c b/pixman/pixman-arm.c +index 23374e4..d98bda6 100644 +--- a/pixman/pixman-arm.c ++++ b/pixman/pixman-arm.c +@@ -129,16 +129,35 @@ detect_cpu_features (void) + #include <sys/types.h> + #include <sys/stat.h> + #include <sys/mman.h> ++#include <sys/utsname.h> + #include <fcntl.h> + #include <string.h> + #include <elf.h> + ++/* ++ * The whole CPU capabilities detection is a bit ugly: when running in ++ * userspace qemu, we see /proc/self/auxv from the host system. To make ++ * everything even worse, the size of each value is 64-bit when running ++ * on a 64-bit host system. So the data is totally bogus because we expect ++ * 32-bit values. As AT_PLATFORM value is used as a pointer, it may cause ++ * segfault (null pointer dereference on x86-64 host). So in order to be ++ * on a safe side, we require that AT_PLATFORM value is found only once, ++ * and it has non-zero value (this is still not totally reliable for a big ++ * endian 64-bit host system running qemu and may theoretically fail). ++ */ ++#define ARM_HWCAP_VFP 64 ++#define ARM_HWCAP_IWMMXT 512 ++#define ARM_HWCAP_NEON 4096 ++ + static arm_cpu_features_t + detect_cpu_features (void) + { + arm_cpu_features_t features = 0; + Elf32_auxv_t aux; + int fd; ++ uint32_t hwcap = 0; ++ const char *plat = NULL; ++ int plat_cnt = 0; + + fd = open ("/proc/self/auxv", O_RDONLY); + if (fd >= 0) +@@ -147,32 +166,61 @@ detect_cpu_features (void) + { + if (aux.a_type == AT_HWCAP) + { +- uint32_t hwcap = aux.a_un.a_val; +- +- /* hardcode these values to avoid depending on specific +- * versions of the hwcap header, e.g. HWCAP_NEON +- */ +- if ((hwcap & 64) != 0) +- features |= ARM_VFP; +- if ((hwcap & 512) != 0) +- features |= ARM_IWMMXT; +- /* this flag is only present on kernel 2.6.29 */ +- if ((hwcap & 4096) != 0) +- features |= ARM_NEON; ++ hwcap = aux.a_un.a_val; + } + else if (aux.a_type == AT_PLATFORM) + { +- const char *plat = (const char*) aux.a_un.a_val; +- +- if (strncmp (plat, "v7l", 3) == 0) ++ plat = (const char*) aux.a_un.a_val; ++ plat_cnt++; ++ } ++ } ++ close (fd); ++ if (plat == NULL || plat_cnt != 1 || *plat != 'v') ++ { ++ /* ++ * Something seems to be really wrong, most likely we are ++ * running under qemu. Let's use machine type from "uname" for ++ * CPU capabilities detection: ++ * http://www.mail-archive.com/qemu-devel at nongnu.org/msg22212.html ++ */ ++ struct utsname u; ++ hwcap = 0; /* clear hwcap, because it is bogus */ ++ if (uname (&u) == 0) ++ { ++ if (strcmp (u.machine, "armv7l") == 0) ++ { + features |= (ARM_V7 | ARM_V6); +- else if (strncmp (plat, "v6l", 3) == 0) ++ hwcap |= ARM_HWCAP_VFP; /* qemu is supposed to emulate vfp */ ++ hwcap |= ARM_HWCAP_NEON; /* qemu is supposed to emulate neon */ ++ } ++ else if (strcmp (u.machine, "armv6l") == 0) ++ { + features |= ARM_V6; ++ hwcap |= ARM_HWCAP_VFP; /* qemu is supposed to emulate vfp */ ++ } + } + } +- close (fd); ++ else if (strncmp (plat, "v7l", 3) == 0) ++ { ++ features |= (ARM_V7 | ARM_V6); ++ } ++ else if (strncmp (plat, "v6l", 3) == 0) ++ { ++ features |= ARM_V6; ++ } + } + ++ /* hardcode these values to avoid depending on specific ++ * versions of the hwcap header, e.g. HWCAP_NEON ++ */ ++ if ((hwcap & ARM_HWCAP_VFP) != 0) ++ features |= ARM_VFP; ++ if ((hwcap & ARM_HWCAP_IWMMXT) != 0) ++ features |= ARM_IWMMXT; ++ /* this flag is only present on kernel 2.6.29 */ ++ if ((hwcap & ARM_HWCAP_NEON) != 0) ++ features |= ARM_NEON; ++ + return features; + } + +-- +1.7.6.5 + |
