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

["H.J. Lu" <hjl.tools@gmail.com>]

On Thu, Apr 16, 2020 at 5:52 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Mon, Apr 13, 2020 at 10:51 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > 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
> >
>
> PING:
>
> https://sourceware.org/pipermail/libc-alpha/2020-April/112758.html
>

PING.

-- 
H.J.