x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments

For the 32-bit syscall interface, 64-bit arguments (loff_t) are passed via
a pair of 32-bit registers.  These register pairs end up in consecutive stack
slots, which matches the C ABI for 64-bit arguments.  But when accessing the
registers directly from pt_regs, the wrapper needs to manually reassemble the
64-bit value.  These wrappers already exist for 32-bit compat, so make them
available to 32-bit native in preparation for enabling pt_regs-based syscalls.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-16-brgerst@gmail.com

arch/x86/entry/syscalls/syscall_32.tbl

@@ -191,8 +191,8 @@
 177	i386	rt_sigtimedwait		sys_rt_sigtimedwait_time32	compat_sys_rt_sigtimedwait_time32
 178	i386	rt_sigqueueinfo		sys_rt_sigqueueinfo		compat_sys_rt_sigqueueinfo
 179	i386	rt_sigsuspend		sys_rt_sigsuspend		compat_sys_rt_sigsuspend
-180	i386	pread64			sys_pread64			compat_sys_ia32_pread64
-181	i386	pwrite64		sys_pwrite64			compat_sys_ia32_pwrite64
+180	i386	pread64			sys_ia32_pread64
+181	i386	pwrite64		sys_ia32_pwrite64
 182	i386	chown			sys_chown16
 183	i386	getcwd			sys_getcwd
 184	i386	capget			sys_capget
@@ -204,8 +204,8 @@
 190	i386	vfork			sys_vfork
 191	i386	ugetrlimit		sys_getrlimit			compat_sys_getrlimit
 192	i386	mmap2			sys_mmap_pgoff
-193	i386	truncate64		sys_truncate64			compat_sys_ia32_truncate64
-194	i386	ftruncate64		sys_ftruncate64			compat_sys_ia32_ftruncate64
+193	i386	truncate64		sys_ia32_truncate64
+194	i386	ftruncate64		sys_ia32_ftruncate64
 195	i386	stat64			sys_stat64			compat_sys_ia32_stat64
 196	i386	lstat64			sys_lstat64			compat_sys_ia32_lstat64
 197	i386	fstat64			sys_fstat64			compat_sys_ia32_fstat64
@@ -236,7 +236,7 @@
 # 222 is unused
 # 223 is unused
 224	i386	gettid			sys_gettid
-225	i386	readahead		sys_readahead			compat_sys_ia32_readahead
+225	i386	readahead		sys_ia32_readahead
 226	i386	setxattr		sys_setxattr
 227	i386	lsetxattr		sys_lsetxattr
 228	i386	fsetxattr		sys_fsetxattr
@@ -261,7 +261,7 @@
 247	i386	io_getevents		sys_io_getevents_time32
 248	i386	io_submit		sys_io_submit			compat_sys_io_submit
 249	i386	io_cancel		sys_io_cancel
-250	i386	fadvise64		sys_fadvise64			compat_sys_ia32_fadvise64
+250	i386	fadvise64		sys_ia32_fadvise64
 # 251 is available for reuse (was briefly sys_set_zone_reclaim)
 252	i386	exit_group		sys_exit_group
 253	i386	lookup_dcookie		sys_lookup_dcookie		compat_sys_lookup_dcookie
@@ -283,7 +283,7 @@
 269	i386	fstatfs64		sys_fstatfs64			compat_sys_fstatfs64
 270	i386	tgkill			sys_tgkill
 271	i386	utimes			sys_utimes_time32
-272	i386	fadvise64_64		sys_fadvise64_64		compat_sys_ia32_fadvise64_64
+272	i386	fadvise64_64		sys_ia32_fadvise64_64
 273	i386	vserver
 274	i386	mbind			sys_mbind
 275	i386	get_mempolicy		sys_get_mempolicy		compat_sys_get_mempolicy
@@ -325,7 +325,7 @@
 311	i386	set_robust_list		sys_set_robust_list		compat_sys_set_robust_list
 312	i386	get_robust_list		sys_get_robust_list		compat_sys_get_robust_list
 313	i386	splice			sys_splice
-314	i386	sync_file_range		sys_sync_file_range		compat_sys_ia32_sync_file_range
+314	i386	sync_file_range		sys_ia32_sync_file_range
 315	i386	tee			sys_tee
 316	i386	vmsplice		sys_vmsplice			compat_sys_vmsplice
 317	i386	move_pages		sys_move_pages			compat_sys_move_pages
@@ -335,7 +335,7 @@
 321	i386	signalfd		sys_signalfd			compat_sys_signalfd
 322	i386	timerfd_create		sys_timerfd_create
 323	i386	eventfd			sys_eventfd
-324	i386	fallocate		sys_fallocate			compat_sys_ia32_fallocate
+324	i386	fallocate		sys_ia32_fallocate
 325	i386	timerfd_settime		sys_timerfd_settime32
 326	i386	timerfd_gettime		sys_timerfd_gettime32
 327	i386	signalfd4		sys_signalfd4			compat_sys_signalfd4