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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/31640] New: POWER10 ld.so crashes in
 elf_machine_load_address with GCC 14
Date: Sat, 13 Apr 2024 12:10:58 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31640

            Bug ID: 31640
           Summary: POWER10 ld.so crashes in elf_machine_load_address with
                    GCC 14
           Product: glibc
           Version: 2.40
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: fweimer at redhat dot com
          Reporter: fweimer at redhat dot com
                CC: bergner at linux dot ibm.com
  Target Milestone: ---
            Target: powerpc64le-linux-gnu

When built with GCC 14, ld.so crashes in elf_machine_load_address because t=
he
current implementation assumes that r2 still has the kernel-provided value:

static inline Elf64_Addr
elf_machine_load_address (void)
{
  Elf64_Addr ret;

  /* The first entry in .got (and thus the first entry in .toc) is the
     link-time TOC_base, ie. r2.  So the difference between that and
     the current r2 set by the kernel is how far the shared lib has
     moved.  */
  asm ( "       ld      %0,-32768(2)\n"
        "       subf    %0,%0,2\n"
        : "=3Dr"  (ret));
  return ret;
}

I don't think that's necessarily true in PCREL mode, so this is a glibc bug.

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