[Bug math/31022] New: feupdateenv (FE_DFL_ENV) crashes on riscv

["bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31022

            Bug ID: 31022
           Summary: feupdateenv (FE_DFL_ENV) crashes on riscv
           Product: glibc
           Version: 2.37
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: bruno at clisp dot org
  Target Milestone: ---

ISO C 23 § 7.6.6.4 says about feupdateenv:
"The argument envp shall point to an object set by a call to feholdexcept or
fegetenv, or equal a dynamic floating-point environment macro."

This means, it is valid to call feupdateenv (FE_DFL_ENV).

But this call crashes with SIGSEGV on riscv.

How to reproduce:
========================== foo.c ======================
#include <fenv.h>

int
main ()
{
  return feupdateenv (FE_DFL_ENV) != 0;
}
=======================================================
$ gcc -Wall foo.c -lm
$ ./a.out
Segmentation fault (core dumped)

The place where it crashes is obviously at
glibc/sysdeps/riscv/rvf/fenv_private.h line 126:

static __always_inline void
libc_feupdateenv_riscv (const fenv_t *envp)
{
  _FPU_SETCW (*envp | riscv_getflags ());   // <================ HERE
}

with envp being 0xffffffffffffffff.

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