V2 [PATCH 0/2] x32: Properly pass long to syscall [BZ #25810]

[H.J. Lu]

X32 has 32-bit long and pointer with 64-bit off_t.  Since x32 psABI
requires that pointers passed in registers must be zero-extended to
64bit, x32 can share many syscall interfaces with LP64.  When a LP64
syscall with long and unsigned long arguments is used for x32, these
arguments must be properly extended to 64-bit.  Otherwise if the upper
32 bits of the register have undefined value, such a syscall will be
rejected by kernel.

For syscalls implemented in assembly codes, 'U' is added to syscall
signature key letters for unsigned long.  SYSCALL_ULONG_ARG_1 and
SYSCALL_ULONG_ARG_2 are passed to syscall-template.S for the first
and the second unsigned long arguments if PSEUDOS_HAVE_4_ARGS is
defined.  They are used by x32 to zero-extend 32-bit arguments to
64 bits.

Tested on i386, x86-64 and x32 as well as with build-many-glibcs.py.

OK for master branch?

H.J. Lu (2):
  Add SYSCALL_ULONG_ARG_[12] to pass long to syscall [BZ #25810]
  Add a syscall test for [BZ #25810]

 misc/Makefile                               |   2 +-
 misc/tst-syscalls.c                         | 146 ++++++++++++++++++++
 sysdeps/unix/make-syscalls.sh               |  88 ++++++++++++
 sysdeps/unix/syscall-template.S             |  43 +++++-
 sysdeps/unix/syscalls.list                  |   6 +-
 sysdeps/unix/sysv/linux/syscalls.list       |  14 +-
 sysdeps/unix/sysv/linux/x86_64/sysdep.h     |  70 ++++++++--
 sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h |  20 ++-
 8 files changed, 360 insertions(+), 29 deletions(-)
 create mode 100644 misc/tst-syscalls.c

-- 
2.25.2