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H.J. Lu e27f41ba2b Add <bits/indirect-return.h> 
Add <bits/indirect-return.h> and include it in <ucontext.h>.
__INDIRECT_RETURN defined in <bits/indirect-return.h> indicates if
swapcontext requires special compiler treatment.  The default
__INDIRECT_RETURN is empty.

On x86, when shadow stack is enabled, __INDIRECT_RETURN is defined
with indirect_return attribute, which has been added to GCC 9, to
indicate that swapcontext returns via indirect branch.  Otherwise
__INDIRECT_RETURN is defined with returns_twice attribute.

When shadow stack is enabled, remove always_inline attribute from
prepare_test_buffer in string/tst-xbzero-opt.c to avoid:

tst-xbzero-opt.c: In function ‘prepare_test_buffer’:
tst-xbzero-opt.c:105:1: error: function ‘prepare_test_buffer’ can never be inlined because it uses setjmp
 prepare_test_buffer (unsigned char *buf)

when indirect_return attribute isn't available.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

	* bits/indirect-return.h: New file.
	* misc/sys/cdefs.h (__glibc_has_attribute): New.
	* sysdeps/x86/bits/indirect-return.h: Likewise.
	* stdlib/Makefile (headers): Add bits/indirect-return.h.
	* stdlib/ucontext.h: Include <bits/indirect-return.h>.
	(swapcontext): Add __INDIRECT_RETURN.
	* string/tst-xbzero-opt.c (ALWAYS_INLINE): New.
	(prepare_test_buffer): Use it.
2018-07-24 07:55:47 -07:00
..
bits
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sys
Add <bits/indirect-return.h>
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acct.c
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allocate_once.c
Implement allocate_once for atomic initialization with allocation
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ar.h
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brk.c
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bug18240.c
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bug-hsearch1.c
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chflags.c
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daemon.c
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dirname.c
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fstab.c
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fstab.h
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fsync.c
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getttyent.c
Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463).
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getusershell.c
Use (void) in no-arguments function definitions.
2013-06-08 00:22:23 +00:00
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makedev.c
Fix -Os gnu_dev_* linknamespace, localplt issues (bug 15105, bug 19463).
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Makefile
Implement allocate_once for atomic initialization with allocation
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mincore.c
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stab.h
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syscall.c
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syscall.h
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sysexits.h
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syslog.c
Fix -Os putc_unlocked, fputc_unlocked linknamespace, localplt issues (bug 15105, bug 19463).
2018-02-21 18:02:24 +00:00
syslog.h
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truncate64.c
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truncate.c
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tsearch.c
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tst-allocate_once.c
Implement allocate_once for atomic initialization with allocation
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tst-atomic-long.c
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tst-atomic.c
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tst-efgcvt.c
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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-fdset.c
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tst-hsearch.c
Modify several tests to use test-skeleton.c
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tst-insremque.c
[BZ #2766]
2006-06-17 17:01:42 +00:00
tst-makedev.c
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tst-mntent2.c
Fix warning in misc/tst-mntent2.c.
2014-12-16 10:27:16 +01:00
tst-mntent-blank-corrupt.c
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tst-mntent-blank-passno.c
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tst-mntent.c
getmntent: fix memory corruption w/blank lines [BZ #18887]
2015-08-29 18:07:00 -04:00
tst-preadvwritev2-common.c
Update RWF_SUPPORTED for Linux kernel 4.16 [BZ #22947]
2018-04-03 12:19:29 -07:00
tst-preadvwritev2.c
preadv2/pwritev2: Handle offset == -1 [BZ #22753]
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tst-preadvwritev64.c
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tst-preadvwritev64v2.c
preadv2/pwritev2: Handle offset == -1 [BZ #22753]
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tst-preadvwritev-common.c
preadv2/pwritev2: Handle offset == -1 [BZ #22753]
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tst-preadvwritev.c
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tst-pselect.c
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tst-tsearch.c
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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
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usleep.c
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ustat.c
Deprecate ustat syscall interface
2018-05-02 08:43:31 -03:00
utimes.c
Add missing start-of-file descriptive comment.
2018-03-06 09:21:04 +01:00
Versions
Implement allocate_once for atomic initialization with allocation
2018-05-23 15:27:01 +02:00
vhangup.c
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writev.c
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