[PATCH] elf: Add _dl_ehdr_start_before_reloc

[H.J. Lu]

rtld.c has

extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
...
  _dl_rtld_map.l_map_start = (ElfW(Addr)) &__ehdr_start;

As

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120653

shows, compiler may generate run-time relocation on __ehdr_start with

movq .LC0(%rip), %xmm0
...
.section .data.rel.ro.local,"aw"
.align 8
.LC0:
.quad __ehdr_start

This won't work before run-time relocation is finished in rtld.c.  Define
_dl_ehdr_start_before_reloc to allow x86-64 to generate LEA to avoid
run-time relocation on __ehdr_start in rtld.c.


-- 
H.J.
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