[Bug libc/26854] New: ld.so startup code lacks unwind information

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26854

            Bug ID: 26854
           Summary: ld.so startup code lacks unwind information
           Product: glibc
           Version: 2.32
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
             Flags: security-

On most architectures, dl-machine.h has a macro like this:

/* Initial entry point code for the dynamic linker.
   The C function `_dl_start' is the real entry point;
   its return value is the user program's entry point.  */
#define RTLD_START asm ("\n\
.text\n\
        .align 16\n\
.globl _start\n\
.globl _dl_start_user\n\
_start:\n\
        movq %rsp, %rdi\n\
        call _dl_start\n\
_dl_start_user:\n\
        # Save the user entry point address in %r12.\n\
…

This lacks CFI annotations.

Before fixing this, it probably makes sense to move this code into a proper
assembler file if possible (!PI_STATIC_AND_HIDDEN architectures may pose
problems).

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