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Author SHA1 Message Date
Florian Weimer 73fc4e28b9 Linux: Consolidate auxiliary vector parsing (redo) 
And optimize it slightly.

This is commit 8c8510ab27 revised.

In _dl_aux_init in elf/dl-support.c, use an explicit loop
and -fno-tree-loop-distribute-patterns to avoid memset.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
 2022-02-28 11:50:41 +01:00
Florian Weimer d96d2995c1 Revert "Linux: Consolidate auxiliary vector parsing" 
This reverts commit 8c8510ab27.  The
revert is not perfect because the commit included a bug fix for
_dl_sysdep_start with an empty argv, introduced in commit
2d47fa6862 ("Linux: Remove
DL_FIND_ARG_COMPONENTS"), and this bug fix is kept.

The revert is necessary because the reverted commit introduced an
early memset call on aarch64, which leads to crash due to lack of TCB
initialization.
 2022-02-11 17:10:59 +01:00
Florian Weimer 8c8510ab27 Linux: Consolidate auxiliary vector parsing 
And optimize it slightly.

The large switch statement in _dl_sysdep_start can be replaced with
a large array.  This reduces source code and binary size.  On
i686-linux-gnu:

Before:

   text	   data	    bss	    dec	    hex	filename
   7791	     12	      0	   7803	   1e7b	elf/dl-sysdep.os

After:

   text	   data	    bss	    dec	    hex	filename
   7135	     12	      0	   7147	   1beb	elf/dl-sysdep.os

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 2022-02-10 11:51:55 +01:00