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Szabolcs Nagy 47618209d0 Use hidden visibility for early static PIE code 
Extern symbol access in position independent code usually involves GOT
indirection which needs RELATIVE reloc in a static linked PIE. (On
some targets this is avoided e.g. because the linker can relax a GOT
access to a pc-relative access, but this is not generally true.) Code
that runs before static PIE self relocation must avoid relying on
dynamic relocations which can be ensured by using hidden visibility.
However we cannot just make all symbols hidden:

On i386, all calls to IFUNC functions must go through PLT and calls to
hidden functions CANNOT go through PLT in PIE since EBX used in PIE PLT
may not be set up for local calls to hidden IFUNC functions.

This patch aims to make symbol references hidden in code that is used
before and by _dl_relocate_static_pie when building a static PIE libc.
Note: for an object that is used in the startup code, its references
and definition may not have consistent visibility: it is only forced
hidden in the startup code.

This is needed for fixing bug 27072.

Co-authored-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-01-21 15:55:01 +00:00
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bits Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sys Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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allocate_once.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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bug-hsearch1.c .. 2009-01-23 20:41:36 +00:00
chflags.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chroot.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
daemon.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
dirname.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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fstab.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstab.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
fsync.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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getsysstats.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
getttyent.c Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-21 18:01:11 +00:00
getusershell.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
getxattr.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
gtty.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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mntent_r.c mntent: Use __putc_unlocked instead of fputc_unlocked 2021-01-08 21:02:12 +05:30
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revoke.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sbrk.c Use hidden visibility for early static PIE code 2021-01-21 15:55:01 +00:00
search.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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stab.h Update. 1997-06-21 02:59:26 +00:00
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swapoff.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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syscall.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
syscall.h update from main archive 960107 1997-01-07 23:29:44 +00:00
sysexits.h Update. 1999-06-09 13:08:30 +00:00
syslog.c Correct locking and cancellation cleanup in syslog functions (bug 26100) 2020-08-18 11:27:03 +02:00
syslog.h initial import 1995-02-18 01:27:10 +00:00
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truncate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-efgcvt-template.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-empty.c Move all tests out of the csu subdirectory 2016-12-21 11:52:19 +01:00
tst-error1.c Split DIAG_* macros to new header libc-diag.h. 2017-02-25 09:59:46 -05:00
tst-fd_to_filename.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-hsearch.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-insremque.c [BZ #2766] 2006-06-17 17:01:42 +00:00
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tst-mntent2.c Fix warning in misc/tst-mntent2.c. 2014-12-16 10:27:16 +01:00
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tst-mntent.c getmntent: fix memory corruption w/blank lines [BZ #18887] 2015-08-29 18:07:00 -04:00
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ttyent.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
ttyslot.c As a minor cleanup remove the (r)index defines from include/string.h as 2017-02-06 18:15:18 +00:00
ualarm.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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Versions Add the __libc_single_threaded variable 2020-07-06 11:15:58 +02:00
vhangup.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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