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From: "hsuhau617 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/99157] [ARM] libgcc -mcmse check always fail
Date: Fri, 19 Feb 2021 16:06:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99157

--- Comment #3 from Hau Hsu <hsuhau617 at gmail dot com> ---
Here are some more info.

This check determines whether macro __ARM_FEATURE_CMSE is set to 3,
and affects CMSE support for function cmse_check_address_range():

void *
__attribute__ ((warn_unused_result))
cmse_check_address_range (void *p, size_t size, int flags)
{
...
#if __ARM_FEATURE_CMSE & 2
    case CMSE_MPU_NONSECURE:
      permb =3D cmse_TTA (pb);
      perme =3D singleCheck ? permb : cmse_TTA (pe);
      break;
    case CMSE_MPU_UNPRIV | CMSE_MPU_NONSECURE:
      permb =3D cmse_TTAT (pb);
      perme =3D singleCheck ? permb : cmse_TTAT (pe);
      break;
#endif
...
}

Since the check always fail, CMSE support for all multilibs are disabled.

The objdump results of v8-m.main libgcc for gcc-arm-none-eabi-7-2018-q2-upd=
ate
and gcc-arm-none-eabi-10-2020-q4-major are attached.=