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

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

[bruno at clisp dot 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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[Bug math/31022] feupdateenv (FE_DFL_ENV) crashes on riscv

[bruno at clisp dot org]

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

Bruno Haible <bruno at clisp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|                            |riscv64-linux-gnu

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

[adhemerval.zanella at linaro dot org]

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

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.39
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.39 (802aef27b2d9f04b06344706f88d37bbe89629e9).

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