[r200] 'readpix' sigfault back trace SSE/MMX is culprit

[Dieter <Die...@ha...>]

Move window 'out' to the left.

NO sigfault with MESA_NO_SSE and MESA_NO_MMX.

With MMX:
#0  0x406a92b5 in _generic_read_RGBA_span_BGRA8888_REV_MMX ()
   from /usr/X11R6/lib/modules/dri/r200_dri.so
(gdb) list
262
263        TempImage = (GLubyte *) malloc(ImgWidth * ImgHeight * 4 * 
sizeof(GLubyte));
264        assert(TempImage);
265     }
266
267
268     int
269     main( int argc, char *argv[] )
270     {
271        GLboolean ciMode = GL_FALSE;
(gdb) bt
#0  0x406a92b5 in _generic_read_RGBA_span_BGRA8888_REV_MMX ()
   from /usr/X11R6/lib/modules/dri/r200_dri.so
#1  0x405655af in r200ReadRGBASpan_ARGB8888_MMX (ctx=0x7fffb862, n=194, x=5,
    y=229, rgba=0x45024008) at spantmp2.h:415
#2  0x40602944 in read_fast_rgba_pixels (ctx=0x8060928, x=5, y=20,
    width=2147465314, height=188, format=6408, type=5121, pixels=0x7fffb862,
    packing=0x45048000) at swrast/s_readpix.c:288
#3  0x406029f5 in read_rgba_pixels (ctx=0x8060928, x=5, y=20, width=194,
    height=188, format=6408, type=5121, pixels=0x45024008, packing=0xbfffeb30)
    at swrast/s_readpix.c:324
#4  0x40603237 in _swrast_ReadPixels (ctx=0x8060928, x=5, y=20, width=194,
    height=188, format=6408, type=5121, packing=0xbfffeb30, pixels=0x45024008)
    at swrast/s_readpix.c:556
#5  0x405552e5 in r200ReadPixels (ctx=0x8060928, x=5, y=20, width=194,
    height=188, format=6408, type=5121, pack=0x8073c24, pixels=0x45024008)
    at r200_pixel.c:281
#6  0x4064bd44 in _mesa_ReadPixels (x=2147465314, y=2147465314, width=194,
    height=188, format=2147465314, type=2147465314, pixels=0x7fffb862)
    at main/drawpix.c:171
#7  0x0804942f in Display () at readpix.c:141
#8  0x40045f8e in processWindowWorkList () from /usr/lib/libglut.so.3
#9  0x4004601a in __glutProcessWindowWorkLists () from /usr/lib/libglut.so.3
#10 0x4004608b in glutMainLoop () from /usr/lib/libglut.so.3
#11 0x080499e7 in main (argc=1, argv=0xbfffedf4) at readpix.c:287
(gdb) info registers
eax            0x7fffb862       2147465314
ecx            0x45048000       1157922816
edx            0xfffffe12       -494
ebx            0x4091c140       1083294016
esp            0xbffe69e8       0xbffe69e8
ebp            0xbffe6a28       0xbffe6a28
esi            0x2ee    750
edi            0x0      0
eip            0x406a92b5       0x406a92b5
eflags         0x10212  66066
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51


With SSE:
#0  0x406a931d in _generic_read_RGBA_span_BGRA8888_REV_SSE ()
   from /usr/X11R6/lib/modules/dri/r200_dri.so
(gdb) list
262
263        TempImage = (GLubyte *) malloc(ImgWidth * ImgHeight * 4 * 
sizeof(GLubyte));
264        assert(TempImage);
265     }
266
267
268     int
269     main( int argc, char *argv[] )
270     {
271        GLboolean ciMode = GL_FALSE;
(gdb) bt
#0  0x406a931d in _generic_read_RGBA_span_BGRA8888_REV_SSE ()
   from /usr/X11R6/lib/modules/dri/r200_dri.so
#1  0xff131f11 in ?? ()
(gdb) info registers
eax            0xff4d4d4d       -11711155
ecx            0x4504826c       1157923436
edx            0x0      0
ebx            0x407f7404       1082094596
esp            0xbffe69e0       0xbffe69e0
ebp            0xbffe69f0       0xbffe69f0
esi            0xfffffddf       -545
edi            0x0      0
eip            0x406a931d       0x406a931d
eflags         0x10203  66051
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51

-Dieter