[Mono-dev] Failed assertion on ARM11 after compiling with -DARM_FPU_VFP

Bill Agee billagee at gmail.com
Sat Jun 25 21:15:38 EDT 2011

Hi all,

I'm seeing an odd mono crash after cross compiling mono for a Cavium Econa
CNS3420 (a dual-core ARM11).

I'm using the mono-2.10.2 tarball.

The CNS3420 appears to support VFP, but when I compile Mono with these

  CFLAGS="-DARM_FPU_VFP -O3 -march=armv6k -mcpu=mpcore -mfloat-abi=softfp

...I frequently see a crash in mono when running on my target machine.

The .NET stacktrace varies, but the native stacktrace and error is always
this failed assertion:

wrong maximal instruction length of instruction r4const (expected 20, got
* Assertion: should not be reached at mini-arm.c:4658

Native stacktrace:

        mono() [0xa6928]
        /lib/libc.so.6(__default_rt_sa_restorer_v2+0) [0x3575d660]
        /lib/libc.so.6(gsignal+0x40) [0x3575c2fc]
        /lib/libc.so.6(abort+0x1b0) [0x35761b14]
        mono() [0x1ed810]
        mono() [0x1ed854]
        mono() [0xd8e10]
        mono() [0x1c494]
        mono() [0x2166c]
        mono() [0x22b74]
        mono() [0x2342c]
        mono(mono_compile_method+0x18) [0x1a4560]
        mono() [0xaab50]
        mono() [0xab6c4]


The problem goes away if I compile with -DARM_FPU_NONE instead of

  CFLAGS="-DARM_FPU_NONE -O3 -march=armv6k -mcpu=mpcore -mfloat-abi=softfp

Does anyone have any idea what the issue might be?

Here's the full build command from my makefile:

          CFLAGS="-DARM_FPU_VFP -O3 -march=armv6k -mcpu=mpcore
-mfloat-abi=softfp -mfpu=vfp" \
          ./configure \
          --prefix=/foo \
          --disable-mcs-build \
          --with-profile4=no \
          --with-moonlight=no \
          --host=arm-none-linux-gnueabi \
          --with-tls=pthread \
          --with-sigaltstack=no \
          mono_cv_uscore=${mono_cv_uscore=no} && \

Thanks in advance for any hints/pointers!

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