(gdb) backtrace
#0  __subsf3 (a=-0.0277654491, b=0.000513406587)
    at ../../../../../../../gcc-4.5.1/libgcc/../gcc/config/soft-fp/subsf3.c:42
#1  0x4008e364 in __kernel_cosf (x=<value optimized out>, 
    y=<value optimized out>)
    at ../../../../../../../../../gcc-4.5.1/newlib/libm/math/kf_cos.c:57
#2  0x4008b6a8 in sinf (x=<value optimized out>)
    at ../../../../../../../../../gcc-4.5.1/newlib/libm/math/sf_sin.c:42
#3  0x400199dc in wave_mode_5 (argument=1100206960) at raster.c:270
#4  compute_wave_vertices (argument=1100206960) at raster.c:350
#5  raster_task (argument=1100206960) at raster.c:572
#6  0x40107ff8 in _Thread_Handler ()
    at ../../../../../../rtems-milkymist/c/src/../../cpukit/score/src/threadhandler.c:146
#7  0x40107f6c in _Heap_Get_information (the_heap=<value optimized out>, 
    the_info=0x3a069622)
    at ../../../../../../rtems-milkymist/c/src/../../cpukit/score/src/heapgetinfo.c:57
Backtrace stopped: frame did not save the PC