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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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sys Add <bits/indirect-return.h> 2018-07-24 07:55:47 -07:00
acct.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
allocate_once.c Implement allocate_once for atomic initialization with allocation 2018-05-23 15:27:01 +02:00
ar.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
brk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bug18240.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bug-hsearch1.c
chflags.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
chroot.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
daemon.c Consolidate non cancellable close call 2017-08-18 18:38:55 -03:00
dirname.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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err.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
err.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
error.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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fsetxattr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fstab.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fstab.h
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futimes.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
futimesat.c Add missing start-of-file descriptive comment. 2018-03-06 09:21:04 +01:00
getauxval.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getclktck.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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getpass.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getsysstats.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
getttyent.c Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-21 18:01:11 +00:00
getusershell.c
getxattr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gtty.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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ifunc-impl-list.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
init-misc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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ioctl.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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libgen.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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lutimes.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
madvise.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
makedev.c Fix -Os gnu_dev_* linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-07 14:57:31 +00:00
Makefile Implement allocate_once for atomic initialization with allocation 2018-05-23 15:27:01 +02:00
mincore.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mkdtemp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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mntent_r.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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mntent.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mprotect.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
msync.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
munlock.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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munmap.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preadv2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preadv64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preadv64v2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preadv.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pselect.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ptrace.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pwritev2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pwritev64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pwritev64v2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pwritev.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
qefgcvt_r.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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readv.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
reboot.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
regexp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
regexp.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
remap_file_pages.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
removexattr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
revoke.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sbrk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
search.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
select.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setdomain.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setegid.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
seteuid.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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setregid.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setreuid.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setxattr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sgtty.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sstk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stab.h
stty.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
swapoff.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
swapon.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sync.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syncfs.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syscall.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
syscall.h
sysexits.h
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
truncate64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
truncate.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tsearch.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-allocate_once.c Implement allocate_once for atomic initialization with allocation 2018-05-23 15:27:01 +02:00
tst-atomic-long.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-atomic.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-dirname.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-efgcvt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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-fdset.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-hsearch.c
tst-insremque.c
tst-makedev.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-mntent2.c
tst-mntent-blank-corrupt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-mntent-blank-passno.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-mntent.c
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] 2018-02-02 10:46:26 +01:00
tst-preadvwritev64.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-preadvwritev64v2.c preadv2/pwritev2: Handle offset == -1 [BZ #22753] 2018-02-02 10:46:26 +01:00
tst-preadvwritev-common.c preadv2/pwritev2: Handle offset == -1 [BZ #22753] 2018-02-02 10:46:26 +01:00
tst-preadvwritev.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-pselect.c misc/tst-pselect.c: Add copyright header 2018-01-02 22:07:59 +01:00
tst-tsearch.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ttyent.h
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. 2018-01-01 00:32:25 +00:00
usleep.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
writev.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00