xserver libX11 pixman git update 14/9/2010

3 files changed, 41 insertions, 1 deletions

diff --git a/pixman/test/blitters-test.c b/pixman/test/blitters-test.c
index 1340e081a..a61817d96 100644
--- a/pixman/test/blitters-test.c
+++ b/pixman/test/blitters-test.c
@@ -267,6 +267,7 @@ test_composite (int testnum, int verbose)
     uint32_t *dstbuf, *srcbuf, *maskbuf;

     uint32_t crc32;

     int max_width, max_height, max_extra_stride;

+    FLOAT_REGS_CORRUPTION_DETECTOR_START ();

 

     max_width = max_height = 24 + testnum / 10000;

     max_extra_stride = 4 + testnum / 1000000;

@@ -410,7 +411,7 @@ test_composite (int testnum, int verbose)
 	    free_random_image (0, mask_img, -1);

     }

 

-

+    FLOAT_REGS_CORRUPTION_DETECTOR_FINISH ();

     return crc32;

 }

 

diff --git a/pixman/test/scaling-test.c b/pixman/test/scaling-test.c
index 54236faa3..872805338 100644
--- a/pixman/test/scaling-test.c
+++ b/pixman/test/scaling-test.c
@@ -46,6 +46,7 @@ test_composite (int      testnum,
     uint32_t *         srcbuf;

     uint32_t *         dstbuf;

     uint32_t           crc32;

+    FLOAT_REGS_CORRUPTION_DETECTOR_START ();

 

     lcg_srand (testnum);

 

@@ -234,6 +235,8 @@ test_composite (int      testnum,
     crc32 = compute_crc32 (0, dstbuf, dst_stride * dst_height);

     free (srcbuf);

     free (dstbuf);

+

+    FLOAT_REGS_CORRUPTION_DETECTOR_FINISH ();

     return crc32;

 }

 

diff --git a/pixman/test/utils.h b/pixman/test/utils.h
index a5b3c91c4..ab71452a4 100644
--- a/pixman/test/utils.h
+++ b/pixman/test/utils.h
@@ -1,5 +1,6 @@
 #include <stdlib.h>

 #include <config.h>

+#include <assert.h>

 #include "pixman-private.h" /* For 'inline' definition */

 

 /* A primitive pseudorandom number generator,

@@ -65,3 +66,38 @@ fuzzer_test_main (const char *test_name,
 

 void

 fail_after (int seconds, const char *msg);

+

+/* A pair of macros which can help to detect corruption of

+ * floating point registers after a function call. This may

+ * happen if _mm_empty() call is forgotten in MMX/SSE2 fast

+ * path code, or ARM NEON assembly optimized function forgets

+ * to save/restore d8-d15 registers before use.

+ */

+

+#define FLOAT_REGS_CORRUPTION_DETECTOR_START()                 \

+    static volatile double frcd_volatile_constant1 = 123451;   \

+    static volatile double frcd_volatile_constant2 = 123452;   \

+    static volatile double frcd_volatile_constant3 = 123453;   \

+    static volatile double frcd_volatile_constant4 = 123454;   \

+    static volatile double frcd_volatile_constant5 = 123455;   \

+    static volatile double frcd_volatile_constant6 = 123456;   \

+    static volatile double frcd_volatile_constant7 = 123457;   \

+    static volatile double frcd_volatile_constant8 = 123458;   \

+    double frcd_canary_variable1 = frcd_volatile_constant1;    \

+    double frcd_canary_variable2 = frcd_volatile_constant2;    \

+    double frcd_canary_variable3 = frcd_volatile_constant3;    \

+    double frcd_canary_variable4 = frcd_volatile_constant4;    \

+    double frcd_canary_variable5 = frcd_volatile_constant5;    \

+    double frcd_canary_variable6 = frcd_volatile_constant6;    \

+    double frcd_canary_variable7 = frcd_volatile_constant7;    \

+    double frcd_canary_variable8 = frcd_volatile_constant8;

+

+#define FLOAT_REGS_CORRUPTION_DETECTOR_FINISH()                \

+    assert (frcd_canary_variable1 == frcd_volatile_constant1); \

+    assert (frcd_canary_variable2 == frcd_volatile_constant2); \

+    assert (frcd_canary_variable3 == frcd_volatile_constant3); \

+    assert (frcd_canary_variable4 == frcd_volatile_constant4); \

+    assert (frcd_canary_variable5 == frcd_volatile_constant5); \

+    assert (frcd_canary_variable6 == frcd_volatile_constant6); \

+    assert (frcd_canary_variable7 == frcd_volatile_constant7); \

+    assert (frcd_canary_variable8 == frcd_volatile_constant8);