[Bug dynamic-link/31662] Stack not aligned at _start when calling ld.so explicitly

["hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31662

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
The assembly code doesn't align stack when calling memcpy:

[hjl@gnu-cfl-3 tmp]$ cat x.c
extern void *dest;
extern void *src;
extern void copy (void *, void *, long);

int
foo (void)
{
  copy (dest, src, 5);
  return 0;
}
[hjl@gnu-cfl-3 tmp]$ gcc -S -O2 x.c
[hjl@gnu-cfl-3 tmp]$ cat x.s
        .file   "x.c"
        .text
        .p2align 4
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        subq    $8, %rsp   <<<<<<<<<< Align stack to 16 bytes before calling
copy.
        .cfi_def_cfa_offset 16
        movq    src(%rip), %rsi
        movq    dest(%rip), %rdi
        movl    $5, %edx
        call    copy
        xorl    %eax, %eax
        addq    $8, %rsp
        .cfi_def_cfa_offset 8
        ret
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 14.0.1 20240411 (Red Hat 14.0.1-0)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-3 tmp]$

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