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glibc/sysdeps/unix/sysv/linux
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Adhemerval Zanella b3778c01b7 sparc: Move sigreturn stub to assembly 
It seems that some gcc versions might generates a stack frame for the
sigreturn stub requires on sparc signal handling.  For instance:

  $ cat test.c
  #define _GNU_SOURCE
  #include <sys/syscall.h>

  __attribute__ ((__optimize__ ("-fno-stack-protector")))
  void
  __sigreturn_stub (void)
  {
    __asm__ ("mov %0, %%g1\n\t"
            "ta  0x10\n\t"
            : /* no outputs */
            : "i" (SYS_rt_sigreturn));
  }
  $ gcc -v
  [...]
  gcc version 9.2.1 20200224 (Debian 9.2.1-30)
  $ gcc -O2 -m64 test.c -S -o -
  [...]
    __sigreturn_stub:
          save    %sp, -176, %sp
  #APP
  ! 9 "t.c" 1
          mov 101, %g1
          ta  0x10

  ! 0 "" 2
  #NO_APP
          .size   __sigreturn_stub, .-__sigreturn_stub

As indicated by kernel developers [1], the sigreturn stub can not change
the register window or the stack pointer since the kernel has setup the
restore frame at a precise location relative to the stack pointer when
the stub is invoked.

I tried to play with some compiler flags and even with _Noreturn and
__builtin_unreachable after the asm does not help (and Sparc does not
support naked functions).

To avoid similar issues, as the stack-protector support also have
stumbled, this patch moves the implementation of the sigreturn stubs to
assembly.

Checked on sparcv9-linux-gnu and sparc64-linux-gnu with gcc 9.2.1
and gcc 7.5.0.

[1] https://lkml.org/lkml/2016/5/27/465

(cherry picked from commit b33e946fbb)
 		2020-03-24 08:48:45 -03:00
..
aarch64 nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
alpha alpha: force old OSF1 syscalls for getegid, geteuid and getppid [BZ #24986] 2019-09-14 20:08:02 +02:00
arm nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
bits Don't use a custom wrapper macro around __has_include (bug 25189). 2019-11-22 13:09:01 +01:00
csky nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
generic Break lines before not after operators, batch 4. 2019-03-07 20:20:25 +00:00
hppa hppa: Align __clone stack argument to 8 bytes (Bug 25066) 2020-02-05 22:13:40 +01:00
i386 nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
ia64 nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
include
…
m68k nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
microblaze microblaze: Avoid clobbering register parameters in syscall 2020-02-16 15:16:10 +01:00
mips mips: Fix argument passing for inlined syscalls on Linux [BZ #25523] 2020-02-16 11:44:25 +01:00
net
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netash
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netatalk
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netax25
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neteconet
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netinet
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netipx
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netiucv
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netpacket
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netrom
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netrose
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nfs
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nios2 nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
powerpc Restore r31 setting in powerpc32 swapcontext. 2019-07-30 14:05:11 +00:00
riscv riscv: Avoid clobbering register parameters in syscall 2020-02-16 15:16:50 +01:00
s390 login: Add nonstring attributes to struct utmp, struct utmpx [BZ #24899] 2020-01-17 13:56:00 +01:00
scsi
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sh nptl: Add POSIX-proposed pthread_mutex_clocklock 2019-07-12 13:36:25 +00:00
sparc sparc: Move sigreturn stub to assembly 2020-03-24 08:48:45 -03:00
sys Linux: Deprecate <sys/sysctl.h> and sysctl 2019-06-12 14:32:08 +02:00
wordsize-64
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x86 nptl: Rename lll_timedlock to lll_clocklock and add clockid parameter 2019-07-12 13:36:25 +00:00
x86_64 rtld: Check __libc_enable_secure before honoring LD_PREFER_MAP_32BIT_EXEC (CVE-2019-19126) [BZ #25204] 2019-11-22 13:09:23 +01:00
Implies
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Makefile Add nocancel version of pread64() 2020-01-17 13:56:43 +01:00
Versions Add nocancel version of pread64() 2020-01-17 13:56:43 +01:00
_G_config.h
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_exit.c
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a.out.h
…
accept.c
…
accept4.c
…
access.c
…
adjtime.c
…
aio_misc.h
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aio_sigqueue.c
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alphasort64.c
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arch-fork.h
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bind.c
…
check_native.c
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check_pf.c
…
clock.c
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clock_getcpuclockid.c
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clock_getres.c
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clock_gettime.c
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clock_nanosleep.c
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clock_settime.c
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close.c
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close_nocancel.c
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cmsg_nxthdr.c
…
configure
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configure.ac
…
connect.c
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copy_file_range.c io: Remove copy_file_range emulation [BZ #24744] 2019-06-28 09:39:21 +02:00
creat.c
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creat64.c
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createthread.c
…
default-sched.h
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device-nrs.h
…
dl-brk.c
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dl-execstack.c
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dl-fxstatat64.c
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dl-getcwd.c
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dl-librecon.h
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dl-openat64.c
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dl-opendir.c
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dl-origin.c
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dl-osinfo.h
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dl-sbrk.c
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dl-sysdep.c
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dl-sysdep.h
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dl-vdso.c
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dl-vdso.h dl-vdso: Add LINUX_4 HASH CODE to support nds32 vdso mechanism 2019-07-08 15:57:01 -03:00
dl-writev.h
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epoll_pwait.c
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epoll_wait.c
…
errqueue.h
…
eventfd_read.c
…
eventfd_write.c
…
exit-thread.h
…
faccessat.c
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fallocate.c
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fallocate64.c
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fatal-prepare.h
…
fchmodat.c
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fcntl.c
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fcntl64.c
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fcntl_nocancel.c
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fd_to_filename.h
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fdatasync.c
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fexecve.c
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filter-nr-syscalls.awk
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fips-private.h
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fpathconf.c
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fstatfs64.c
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fstatvfs.c
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fstatvfs64.c
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fsync.c
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ftime.c
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ftruncate.c
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ftruncate64.c
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futex-internal.h nptl: Remove futex_supports_exact_relative_timeouts 2019-07-12 13:36:25 +00:00
futimens.c
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futimes.c
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futimesat.c
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fxstat.c
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fxstat64.c
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fxstatat.c
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fxstatat64.c
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gai_sigqueue.c
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gen-syscall-h.awk
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gentempfd.c
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getclktck.c
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getcpu.c
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getcwd.c
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getdents.c Linux: Add getdents64 system call 2019-06-07 09:27:01 +02:00
getdents64.c Linux: Adjust gedents64 buffer size to int range [BZ #24740] 2019-06-27 15:08:40 +02:00
getdirentries.c
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getdirentries64.c
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getdtsz.c
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getentropy.c
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gethostid.c
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getipv4sourcefilter.c
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getloadavg.c
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getlogin.c
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getlogin_r.c
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getpagesize.c
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getpeername.c
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getpriority.c
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getpt.c
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getrandom.c
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getrlimit.c
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getrlimit64.c
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getsockname.c
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getsockopt.c
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getsourcefilter.c
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getsourcefilter.h
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getsysstats.c
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gettimeofday.c
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glob-lstat-compat.c
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glob.c
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glob64-lstat-compat.c
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glob64.c
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globfree.c
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globfree64.c
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grantpt.c
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if_index.c
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ifaddrs.c
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ifreq.c
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internal-signals.h
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internal_statvfs.c
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internal_statvfs.h
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internal_statvfs64.c
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ipc_ops.h
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ipc_priv.h sysvipc: Consolidate semtimedop s390 2019-05-20 12:25:31 -03:00
kernel-features.h io: Remove copy_file_range emulation [BZ #24744] 2019-06-28 09:39:21 +02:00
kernel-posix-cpu-timers.h
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kernel-posix-timers.h
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kernel_sigaction.h
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kernel_stat.h
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kernel_termios.h
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ldd-rewrite.sed
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lddlibc4.c
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ldsodefs.h
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libc_fatal.c
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linux_fsinfo.h
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listen.c
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local-setxid.h
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lowlevellock-futex.h nptl: Add clockid parameter to futex timed wait calls 2019-07-12 13:36:23 +00:00
lseek.c
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lseek64.c
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lutimes.c
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lxstat.c
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lxstat64.c
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malloc-sysdep.h
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mlock2.c
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mmap.c
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mmap64.c posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
mmap_internal.h
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mq_close.c
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mq_getattr.c
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mq_notify.c
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mq_open.c
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mq_receive.c
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mq_send.c
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mq_timedreceive.c
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mq_timedsend.c
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mq_unlink.c
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msgctl.c sysvipc: Fix compat msgctl (BZ#24570) 2019-05-20 12:25:28 -03:00
msgget.c
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msgrcv.c
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msgsnd.c
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msync.c
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nanosleep.c
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nanosleep_nocancel.c
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netlink_assert_response.c
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netlinkaccess.h
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nice.c
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not-cancel.h Add nocancel version of pread64() 2020-01-17 13:56:43 +01:00
not-errno.h
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nscd_setup_thread.c
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ntp_gettime.c
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ntp_gettimex.c
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olddirent.h
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oldglob.c
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open.c
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open64.c
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open64_nocancel.c
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open_by_handle_at.c
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open_nocancel.c
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openat.c
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openat64.c
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openat64_nocancel.c
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openat_nocancel.c
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opensock.c
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pathconf.c
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pathconf.h
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paths.h
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pause.c
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pause_nocancel.c
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personality.c
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pkey_get.c
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pkey_mprotect.c
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pkey_set.c
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poll.c
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posix_fadvise.c
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posix_fadvise64.c
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posix_fallocate.c
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posix_fallocate64.c
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posix_madvise.c
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ppoll.c
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pread.c
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pread64.c
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pread64_nocancel.c Add nocancel version of pread64() 2020-01-17 13:56:43 +01:00
preadv.c
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preadv2.c
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preadv64.c
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preadv64v2.c
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prlimit.c
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prof-freq.c
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profil.c
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pselect.c
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pt-raise.c
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pthread-pids.h
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pthread_getaffinity.c
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pthread_getcpuclockid.c
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pthread_getname.c
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pthread_kill.c
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pthread_setaffinity.c
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pthread_setname.c
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pthread_sigmask.c
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pthread_sigqueue.c
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ptrace.c
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ptsname.c
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pwrite.c
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pwrite64.c
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pwritev.c
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pwritev2.c
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pwritev64.c
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pwritev64v2.c
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raise.c
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read.c
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read_nocancel.c
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readahead.c
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readdir.c
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readdir64.c
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readdir64_r.c
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readdir_r.c
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readonly-area.c
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readv.c
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reboot.c
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recv.c
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recvfrom.c
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recvmmsg.c
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recvmsg.c
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remove.c
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rename.c
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renameat.c
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renameat2.c
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sa_len.c
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safe-fatal.h
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scandir64.c
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sched_getaffinity.c
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sched_getcpu.c
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sched_setaffinity.c
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segfault.c
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select.c
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semctl.c
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semget.c
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semop.c
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semtimedop.c sysvipc: Consolidate semtimedop s390 2019-05-20 12:25:31 -03:00
send.c
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sendmmsg.c
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sendmsg.c
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sendto.c
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setegid.c
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seteuid.c
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setgid.c
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setgroups.c
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sethostid.c
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setipv4sourcefilter.c
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setregid.c
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setresgid.c
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setresuid.c
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setreuid.c
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setrlimit.c
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setrlimit64.c
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setsockopt.c
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setsourcefilter.c
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setuid.c
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shlib-versions
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shm-directory.c
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shmat.c
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shmctl.c
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shmdt.c
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shmget.c
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shutdown.c
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sigaction.c
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siglist.h
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signal.c
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signalfd.c
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sigpending.c
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sigprocmask.c
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sigqueue.c
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sigreturn.c
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sigset-cvt-mask.h
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sigsetops.h
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sigstack.c
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sigsuspend.c
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sigtimedwait.c
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sigwait.c
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sigwaitinfo.c
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single-thread.h Add single-thread.h header 2019-05-14 08:41:15 -03:00
sizes.h
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socket.c
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socketcall.h
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socketpair.c
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spawni.c
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speed.c
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splice.c
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statfs64.c
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statvfs.c
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statvfs64.c
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statx.c
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statx_cp.c
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statx_cp.h
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sync_file_range.c
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syscall-names.list Linux: Update syscall-names.list to Linux 5.2 2019-07-19 08:53:04 +02:00
syscalls.list Linux: Add the tgkill function 2019-05-14 22:55:51 +02:00
sysconf.c linux: Assume clock_getres CLOCK_{PROCESS,THREAD}_CPUTIME_ID 2019-03-22 16:52:29 -03:00
sysctl.c Linux: Deprecate <sys/sysctl.h> and sysctl 2019-06-12 14:32:08 +02:00
sysctl.mk
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sysdep-cancel.h Add single-thread.h header 2019-05-14 08:41:15 -03:00
sysdep-vdso.h
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sysdep.h
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syslog.c
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tcdrain.c
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tcflow.c
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tcflush.c
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tcgetattr.c
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tcgetpgrp.c
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tcsendbrk.c
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tcsetattr.c
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tcsetpgrp.c
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tee.c
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termio.h
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test-errno-linux.c misc/test-errno-linux: Handle EINVAL from quotactl 2019-12-05 17:30:13 +01:00
time.c
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timer_create.c
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timer_delete.c
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timer_getoverr.c
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timer_gettime.c
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timer_routines.c
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timer_settime.c
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times.c
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timespec_get.c
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truncate.c
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truncate64.c
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tst-affinity-pid.c
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tst-affinity-static.c
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tst-affinity.c
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tst-align-clone.c
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tst-clone.c
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tst-clone2.c
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tst-clone3.c
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tst-fallocate-common.c
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tst-fallocate.c
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tst-fallocate64.c
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tst-fanotify.c
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tst-getdents64.c Linux: Use mmap instead of malloc in dirent/tst-getdents64 2019-06-28 14:05:02 +02:00
tst-getpid1.c
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tst-gettid-kill.c
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tst-gettid.c
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tst-memfd_create.c
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tst-mlock2.c
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tst-mman-consts.py
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tst-ofdlocks-compat.c
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tst-ofdlocks.c
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tst-personality.c Break lines before not after operators, batch 4. 2019-03-07 20:20:25 +00:00
tst-pkey.c
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tst-quota.c
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tst-readdir64-compat.c
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tst-rlimit-infinity.c
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tst-setgetname.c
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tst-signal-numbers.py
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tst-skeleton-affinity.c
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tst-skeleton-thread-affinity.c
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tst-socket-consts.py Linux: Use in-tree copy of SO_ constants for !__USE_MISC [BZ #24532] 2019-07-24 10:59:34 +02:00
tst-sync_file_range.c
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tst-syscall-list.sh
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tst-sysconf-iov_max-uapi.c
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tst-sysconf-iov_max.c
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tst-tgkill.c Linux: Add the tgkill function 2019-05-14 22:55:51 +02:00
tst-thread-affinity-pthread.c
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tst-thread-affinity-pthread2.c
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tst-thread-affinity-sched.c
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tst-ttyname.c Break lines before not after operators, batch 4. 2019-03-07 20:20:25 +00:00
ttyname.c
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ttyname.h
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ttyname_r.c
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ualarm.c
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umount.c
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umount2.S
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unlockpt.c
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updwtmp.c
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ustat.c
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utimensat.c
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utimes.c
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utmp_file.c
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versionsort64.c
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vfork.c
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vmsplice.c
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wait.c
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wait3.c
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waitid.c
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waitpid.c
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waitpid_nocancel.c
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write.c
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write_nocancel.c
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writev.c
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xmknod.c
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xmknodat.c
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xstat.c
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xstat64.c
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xstatconv.c
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xstatconv.h
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