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-rw-r--r--arch/arm64/kernel/sys32.S282
1 files changed, 282 insertions, 0 deletions
diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S
new file mode 100644
index 000000000000..5e4dc93cc31f
--- /dev/null
+++ b/arch/arm64/kernel/sys32.S
@@ -0,0 +1,282 @@
+/*
+ * Compat system call wrappers
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Authors: Will Deacon <will.deacon@arm.com>
+ * Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * System call wrappers for the AArch32 compatibility layer.
+ */
+compat_sys_fork_wrapper:
+ mov x0, sp
+ b compat_sys_fork
+ENDPROC(compat_sys_fork_wrapper)
+
+compat_sys_vfork_wrapper:
+ mov x0, sp
+ b compat_sys_vfork
+ENDPROC(compat_sys_vfork_wrapper)
+
+compat_sys_execve_wrapper:
+ mov x3, sp
+ b compat_sys_execve
+ENDPROC(compat_sys_execve_wrapper)
+
+compat_sys_clone_wrapper:
+ mov x5, sp
+ b compat_sys_clone
+ENDPROC(compat_sys_clone_wrapper)
+
+compat_sys_sigreturn_wrapper:
+ mov x0, sp
+ mov x27, #0 // prevent syscall restart handling (why)
+ b compat_sys_sigreturn
+ENDPROC(compat_sys_sigreturn_wrapper)
+
+compat_sys_rt_sigreturn_wrapper:
+ mov x0, sp
+ mov x27, #0 // prevent syscall restart handling (why)
+ b compat_sys_rt_sigreturn
+ENDPROC(compat_sys_rt_sigreturn_wrapper)
+
+compat_sys_sigaltstack_wrapper:
+ ldr x2, [sp, #S_COMPAT_SP]
+ b compat_do_sigaltstack
+ENDPROC(compat_sys_sigaltstack_wrapper)
+
+compat_sys_statfs64_wrapper:
+ mov w3, #84
+ cmp w1, #88
+ csel w1, w3, w1, eq
+ b compat_sys_statfs64
+ENDPROC(compat_sys_statfs64_wrapper)
+
+compat_sys_fstatfs64_wrapper:
+ mov w3, #84
+ cmp w1, #88
+ csel w1, w3, w1, eq
+ b compat_sys_fstatfs64
+ENDPROC(compat_sys_fstatfs64_wrapper)
+
+/*
+ * Wrappers for AArch32 syscalls that either take 64-bit parameters
+ * in registers or that take 32-bit parameters which require sign
+ * extension.
+ */
+compat_sys_lseek_wrapper:
+ sxtw x1, w1
+ b sys_lseek
+ENDPROC(compat_sys_lseek_wrapper)
+
+compat_sys_pread64_wrapper:
+ orr x3, x4, x5, lsl #32
+ b sys_pread64
+ENDPROC(compat_sys_pread64_wrapper)
+
+compat_sys_pwrite64_wrapper:
+ orr x3, x4, x5, lsl #32
+ b sys_pwrite64
+ENDPROC(compat_sys_pwrite64_wrapper)
+
+compat_sys_truncate64_wrapper:
+ orr x1, x2, x3, lsl #32
+ b sys_truncate
+ENDPROC(compat_sys_truncate64_wrapper)
+
+compat_sys_ftruncate64_wrapper:
+ orr x1, x2, x3, lsl #32
+ b sys_ftruncate
+ENDPROC(compat_sys_ftruncate64_wrapper)
+
+compat_sys_readahead_wrapper:
+ orr x1, x2, x3, lsl #32
+ mov w2, w4
+ b sys_readahead
+ENDPROC(compat_sys_readahead_wrapper)
+
+compat_sys_lookup_dcookie:
+ orr x0, x0, x1, lsl #32
+ mov w1, w2
+ mov w2, w3
+ b sys_lookup_dcookie
+ENDPROC(compat_sys_lookup_dcookie)
+
+compat_sys_fadvise64_64_wrapper:
+ mov w6, w1
+ orr x1, x2, x3, lsl #32
+ orr x2, x4, x5, lsl #32
+ mov w3, w6
+ b sys_fadvise64_64
+ENDPROC(compat_sys_fadvise64_64_wrapper)
+
+compat_sys_sync_file_range2_wrapper:
+ orr x2, x2, x3, lsl #32
+ orr x3, x4, x5, lsl #32
+ b sys_sync_file_range2
+ENDPROC(compat_sys_sync_file_range2_wrapper)
+
+compat_sys_fallocate_wrapper:
+ orr x2, x2, x3, lsl #32
+ orr x3, x4, x5, lsl #32
+ b sys_fallocate
+ENDPROC(compat_sys_fallocate_wrapper)
+
+compat_sys_fanotify_mark_wrapper:
+ orr x2, x2, x3, lsl #32
+ mov w3, w4
+ mov w4, w5
+ b sys_fanotify_mark
+ENDPROC(compat_sys_fanotify_mark_wrapper)
+
+/*
+ * Use the compat system call wrappers.
+ */
+#define sys_fork compat_sys_fork_wrapper
+#define sys_open compat_sys_open
+#define sys_execve compat_sys_execve_wrapper
+#define sys_lseek compat_sys_lseek_wrapper
+#define sys_mount compat_sys_mount
+#define sys_ptrace compat_sys_ptrace
+#define sys_times compat_sys_times
+#define sys_ioctl compat_sys_ioctl
+#define sys_fcntl compat_sys_fcntl
+#define sys_ustat compat_sys_ustat
+#define sys_sigaction compat_sys_sigaction
+#define sys_sigsuspend compat_sys_sigsuspend
+#define sys_sigpending compat_sys_sigpending
+#define sys_setrlimit compat_sys_setrlimit
+#define sys_getrusage compat_sys_getrusage
+#define sys_gettimeofday compat_sys_gettimeofday
+#define sys_settimeofday compat_sys_settimeofday
+#define sys_statfs compat_sys_statfs
+#define sys_fstatfs compat_sys_fstatfs
+#define sys_setitimer compat_sys_setitimer
+#define sys_getitimer compat_sys_getitimer
+#define sys_newstat compat_sys_newstat
+#define sys_newlstat compat_sys_newlstat
+#define sys_newfstat compat_sys_newfstat
+#define sys_wait4 compat_sys_wait4
+#define sys_sysinfo compat_sys_sysinfo
+#define sys_sigreturn compat_sys_sigreturn_wrapper
+#define sys_clone compat_sys_clone_wrapper
+#define sys_adjtimex compat_sys_adjtimex
+#define sys_sigprocmask compat_sys_sigprocmask
+#define sys_getdents compat_sys_getdents
+#define sys_select compat_sys_select
+#define sys_readv compat_sys_readv
+#define sys_writev compat_sys_writev
+#define sys_sysctl compat_sys_sysctl
+#define sys_sched_rr_get_interval compat_sys_sched_rr_get_interval
+#define sys_nanosleep compat_sys_nanosleep
+#define sys_rt_sigreturn compat_sys_rt_sigreturn_wrapper
+#define sys_rt_sigaction compat_sys_rt_sigaction
+#define sys_rt_sigprocmask compat_sys_rt_sigprocmask
+#define sys_rt_sigpending compat_sys_rt_sigpending
+#define sys_rt_sigtimedwait compat_sys_rt_sigtimedwait
+#define sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo
+#define sys_rt_sigsuspend compat_sys_rt_sigsuspend
+#define sys_pread64 compat_sys_pread64_wrapper
+#define sys_pwrite64 compat_sys_pwrite64_wrapper
+#define sys_sigaltstack compat_sys_sigaltstack_wrapper
+#define sys_sendfile compat_sys_sendfile
+#define sys_vfork compat_sys_vfork_wrapper
+#define sys_getrlimit compat_sys_getrlimit
+#define sys_mmap2 sys_mmap_pgoff
+#define sys_truncate64 compat_sys_truncate64_wrapper
+#define sys_ftruncate64 compat_sys_ftruncate64_wrapper
+#define sys_getdents64 compat_sys_getdents64
+#define sys_fcntl64 compat_sys_fcntl64
+#define sys_readahead compat_sys_readahead_wrapper
+#define sys_futex compat_sys_futex
+#define sys_sched_setaffinity compat_sys_sched_setaffinity
+#define sys_sched_getaffinity compat_sys_sched_getaffinity
+#define sys_io_setup compat_sys_io_setup
+#define sys_io_getevents compat_sys_io_getevents
+#define sys_io_submit compat_sys_io_submit
+#define sys_lookup_dcookie compat_sys_lookup_dcookie
+#define sys_timer_create compat_sys_timer_create
+#define sys_timer_settime compat_sys_timer_settime
+#define sys_timer_gettime compat_sys_timer_gettime
+#define sys_clock_settime compat_sys_clock_settime
+#define sys_clock_gettime compat_sys_clock_gettime
+#define sys_clock_getres compat_sys_clock_getres
+#define sys_clock_nanosleep compat_sys_clock_nanosleep
+#define sys_statfs64 compat_sys_statfs64_wrapper
+#define sys_fstatfs64 compat_sys_fstatfs64_wrapper
+#define sys_utimes compat_sys_utimes
+#define sys_fadvise64_64 compat_sys_fadvise64_64_wrapper
+#define sys_mq_open compat_sys_mq_open
+#define sys_mq_timedsend compat_sys_mq_timedsend
+#define sys_mq_timedreceive compat_sys_mq_timedreceive
+#define sys_mq_notify compat_sys_mq_notify
+#define sys_mq_getsetattr compat_sys_mq_getsetattr
+#define sys_waitid compat_sys_waitid
+#define sys_recv compat_sys_recv
+#define sys_recvfrom compat_sys_recvfrom
+#define sys_setsockopt compat_sys_setsockopt
+#define sys_getsockopt compat_sys_getsockopt
+#define sys_sendmsg compat_sys_sendmsg
+#define sys_recvmsg compat_sys_recvmsg
+#define sys_semctl compat_sys_semctl
+#define sys_msgsnd compat_sys_msgsnd
+#define sys_msgrcv compat_sys_msgrcv
+#define sys_msgctl compat_sys_msgctl
+#define sys_shmat compat_sys_shmat
+#define sys_shmctl compat_sys_shmctl
+#define sys_keyctl compat_sys_keyctl
+#define sys_semtimedop compat_sys_semtimedop
+#define sys_mbind compat_sys_mbind
+#define sys_get_mempolicy compat_sys_get_mempolicy
+#define sys_set_mempolicy compat_sys_set_mempolicy
+#define sys_openat compat_sys_openat
+#define sys_futimesat compat_sys_futimesat
+#define sys_pselect6 compat_sys_pselect6
+#define sys_ppoll compat_sys_ppoll
+#define sys_set_robust_list compat_sys_set_robust_list
+#define sys_get_robust_list compat_sys_get_robust_list
+#define sys_sync_file_range2 compat_sys_sync_file_range2_wrapper
+#define sys_vmsplice compat_sys_vmsplice
+#define sys_move_pages compat_sys_move_pages
+#define sys_epoll_pwait compat_sys_epoll_pwait
+#define sys_kexec_load compat_sys_kexec_load
+#define sys_utimensat compat_sys_utimensat
+#define sys_signalfd compat_sys_signalfd
+#define sys_fallocate compat_sys_fallocate_wrapper
+#define sys_timerfd_settime compat_sys_timerfd_settime
+#define sys_timerfd_gettime compat_sys_timerfd_gettime
+#define sys_signalfd4 compat_sys_signalfd4
+#define sys_preadv compat_sys_preadv
+#define sys_pwritev compat_sys_pwritev
+#define sys_rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo
+#define sys_recvmmsg compat_sys_recvmmsg
+#define sys_fanotify_mark compat_sys_fanotify_mark_wrapper
+
+#undef __SYSCALL
+#define __SYSCALL(x, y) .quad y // x
+#define __SYSCALL_COMPAT
+
+/*
+ * The system calls table must be 4KB aligned.
+ */
+ .align 12
+ENTRY(compat_sys_call_table)
+#include <asm/unistd.h>