arch/arm64/kernel/sys32.S

   1 /*
   2  * Compat system call wrappers
   3  *
   4  * Copyright (C) 2012 ARM Ltd.
   5  * Authors: Will Deacon <will.deacon@arm.com>
   6  *          Catalin Marinas <catalin.marinas@arm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/linkage.h>
  22
  23 #include <asm/assembler.h>
  24 #include <asm/asm-offsets.h>
  25
  26 /*
  27  * System call wrappers for the AArch32 compatibility layer.
  28  */
  29 compat_sys_fork_wrapper:
  30         mov     x0, sp
  31         b       compat_sys_fork
  32 ENDPROC(compat_sys_fork_wrapper)
  33
  34 compat_sys_vfork_wrapper:
  35         mov     x0, sp
  36         b       compat_sys_vfork
  37 ENDPROC(compat_sys_vfork_wrapper)
  38
  39 compat_sys_execve_wrapper:
  40         mov     x3, sp
  41         b       compat_sys_execve
  42 ENDPROC(compat_sys_execve_wrapper)
  43
  44 compat_sys_clone_wrapper:
  45         mov     x5, sp
  46         b       compat_sys_clone
  47 ENDPROC(compat_sys_clone_wrapper)
  48
  49 compat_sys_sigreturn_wrapper:
  50         mov     x0, sp
  51         mov     x27, #0         // prevent syscall restart handling (why)
  52         b       compat_sys_sigreturn
  53 ENDPROC(compat_sys_sigreturn_wrapper)
  54
  55 compat_sys_rt_sigreturn_wrapper:
  56         mov     x0, sp
  57         mov     x27, #0         // prevent syscall restart handling (why)
  58         b       compat_sys_rt_sigreturn
  59 ENDPROC(compat_sys_rt_sigreturn_wrapper)
  60
  61 compat_sys_sigaltstack_wrapper:
  62         ldr     x2, [sp, #S_COMPAT_SP]
  63         b       compat_do_sigaltstack
  64 ENDPROC(compat_sys_sigaltstack_wrapper)
  65
  66 compat_sys_statfs64_wrapper:
  67         mov     w3, #84
  68         cmp     w1, #88
  69         csel    w1, w3, w1, eq
  70         b       compat_sys_statfs64
  71 ENDPROC(compat_sys_statfs64_wrapper)
  72
  73 compat_sys_fstatfs64_wrapper:
  74         mov     w3, #84
  75         cmp     w1, #88
  76         csel    w1, w3, w1, eq
  77         b       compat_sys_fstatfs64
  78 ENDPROC(compat_sys_fstatfs64_wrapper)
  79
  80 /*
  81  * Wrappers for AArch32 syscalls that either take 64-bit parameters
  82  * in registers or that take 32-bit parameters which require sign
  83  * extension.
  84  */
  85 compat_sys_lseek_wrapper:
  86         sxtw    x1, w1
  87         b       sys_lseek
  88 ENDPROC(compat_sys_lseek_wrapper)
  89
  90 compat_sys_pread64_wrapper:
  91         orr     x3, x4, x5, lsl #32
  92         b       sys_pread64
  93 ENDPROC(compat_sys_pread64_wrapper)
  94
  95 compat_sys_pwrite64_wrapper:
  96         orr     x3, x4, x5, lsl #32
  97         b       sys_pwrite64
  98 ENDPROC(compat_sys_pwrite64_wrapper)
  99
 100 compat_sys_truncate64_wrapper:
 101         orr     x1, x2, x3, lsl #32
 102         b       sys_truncate
 103 ENDPROC(compat_sys_truncate64_wrapper)
 104
 105 compat_sys_ftruncate64_wrapper:
 106         orr     x1, x2, x3, lsl #32
 107         b       sys_ftruncate
 108 ENDPROC(compat_sys_ftruncate64_wrapper)
 109
 110 compat_sys_readahead_wrapper:
 111         orr     x1, x2, x3, lsl #32
 112         mov     w2, w4
 113         b       sys_readahead
 114 ENDPROC(compat_sys_readahead_wrapper)
 115
 116 compat_sys_lookup_dcookie:
 117         orr     x0, x0, x1, lsl #32
 118         mov     w1, w2
 119         mov     w2, w3
 120         b       sys_lookup_dcookie
 121 ENDPROC(compat_sys_lookup_dcookie)
 122
 123 compat_sys_fadvise64_64_wrapper:
 124         mov     w6, w1
 125         orr     x1, x2, x3, lsl #32
 126         orr     x2, x4, x5, lsl #32
 127         mov     w3, w6
 128         b       sys_fadvise64_64
 129 ENDPROC(compat_sys_fadvise64_64_wrapper)
 130
 131 compat_sys_sync_file_range2_wrapper:
 132         orr     x2, x2, x3, lsl #32
 133         orr     x3, x4, x5, lsl #32
 134         b       sys_sync_file_range2
 135 ENDPROC(compat_sys_sync_file_range2_wrapper)
 136
 137 compat_sys_fallocate_wrapper:
 138         orr     x2, x2, x3, lsl #32
 139         orr     x3, x4, x5, lsl #32
 140         b       sys_fallocate
 141 ENDPROC(compat_sys_fallocate_wrapper)
 142
 143 compat_sys_fanotify_mark_wrapper:
 144         orr     x2, x2, x3, lsl #32
 145         mov     w3, w4
 146         mov     w4, w5
 147         b       sys_fanotify_mark
 148 ENDPROC(compat_sys_fanotify_mark_wrapper)
 149
 150 /*
 151  * Use the compat system call wrappers.
 152  */
 153 #define sys_fork                compat_sys_fork_wrapper
 154 #define sys_open                compat_sys_open
 155 #define sys_execve              compat_sys_execve_wrapper
 156 #define sys_lseek               compat_sys_lseek_wrapper
 157 #define sys_mount               compat_sys_mount
 158 #define sys_ptrace              compat_sys_ptrace
 159 #define sys_times               compat_sys_times
 160 #define sys_ioctl               compat_sys_ioctl
 161 #define sys_fcntl               compat_sys_fcntl
 162 #define sys_ustat               compat_sys_ustat
 163 #define sys_sigaction           compat_sys_sigaction
 164 #define sys_sigsuspend          compat_sys_sigsuspend
 165 #define sys_sigpending          compat_sys_sigpending
 166 #define sys_setrlimit           compat_sys_setrlimit
 167 #define sys_getrusage           compat_sys_getrusage
 168 #define sys_gettimeofday        compat_sys_gettimeofday
 169 #define sys_settimeofday        compat_sys_settimeofday
 170 #define sys_statfs              compat_sys_statfs
 171 #define sys_fstatfs             compat_sys_fstatfs
 172 #define sys_setitimer           compat_sys_setitimer
 173 #define sys_getitimer           compat_sys_getitimer
 174 #define sys_newstat             compat_sys_newstat
 175 #define sys_newlstat            compat_sys_newlstat
 176 #define sys_newfstat            compat_sys_newfstat
 177 #define sys_wait4               compat_sys_wait4
 178 #define sys_sysinfo             compat_sys_sysinfo
 179 #define sys_sigreturn           compat_sys_sigreturn_wrapper
 180 #define sys_clone               compat_sys_clone_wrapper
 181 #define sys_adjtimex            compat_sys_adjtimex
 182 #define sys_sigprocmask         compat_sys_sigprocmask
 183 #define sys_getdents            compat_sys_getdents
 184 #define sys_select              compat_sys_select
 185 #define sys_readv               compat_sys_readv
 186 #define sys_writev              compat_sys_writev
 187 #define sys_sysctl              compat_sys_sysctl
 188 #define sys_sched_rr_get_interval compat_sys_sched_rr_get_interval
 189 #define sys_nanosleep           compat_sys_nanosleep
 190 #define sys_rt_sigreturn        compat_sys_rt_sigreturn_wrapper
 191 #define sys_rt_sigaction        compat_sys_rt_sigaction
 192 #define sys_rt_sigprocmask      compat_sys_rt_sigprocmask
 193 #define sys_rt_sigpending       compat_sys_rt_sigpending
 194 #define sys_rt_sigtimedwait     compat_sys_rt_sigtimedwait
 195 #define sys_rt_sigqueueinfo     compat_sys_rt_sigqueueinfo
 196 #define sys_rt_sigsuspend       compat_sys_rt_sigsuspend
 197 #define sys_pread64             compat_sys_pread64_wrapper
 198 #define sys_pwrite64            compat_sys_pwrite64_wrapper
 199 #define sys_sigaltstack         compat_sys_sigaltstack_wrapper
 200 #define sys_sendfile            compat_sys_sendfile
 201 #define sys_vfork               compat_sys_vfork_wrapper
 202 #define sys_getrlimit           compat_sys_getrlimit
 203 #define sys_mmap2               sys_mmap_pgoff
 204 #define sys_truncate64          compat_sys_truncate64_wrapper
 205 #define sys_ftruncate64         compat_sys_ftruncate64_wrapper
 206 #define sys_getdents64          compat_sys_getdents64
 207 #define sys_fcntl64             compat_sys_fcntl64
 208 #define sys_readahead           compat_sys_readahead_wrapper
 209 #define sys_futex               compat_sys_futex
 210 #define sys_sched_setaffinity   compat_sys_sched_setaffinity
 211 #define sys_sched_getaffinity   compat_sys_sched_getaffinity
 212 #define sys_io_setup            compat_sys_io_setup
 213 #define sys_io_getevents        compat_sys_io_getevents
 214 #define sys_io_submit           compat_sys_io_submit
 215 #define sys_lookup_dcookie      compat_sys_lookup_dcookie
 216 #define sys_timer_create        compat_sys_timer_create
 217 #define sys_timer_settime       compat_sys_timer_settime
 218 #define sys_timer_gettime       compat_sys_timer_gettime
 219 #define sys_clock_settime       compat_sys_clock_settime
 220 #define sys_clock_gettime       compat_sys_clock_gettime
 221 #define sys_clock_getres        compat_sys_clock_getres
 222 #define sys_clock_nanosleep     compat_sys_clock_nanosleep
 223 #define sys_statfs64            compat_sys_statfs64_wrapper
 224 #define sys_fstatfs64           compat_sys_fstatfs64_wrapper
 225 #define sys_utimes              compat_sys_utimes
 226 #define sys_fadvise64_64        compat_sys_fadvise64_64_wrapper
 227 #define sys_mq_open             compat_sys_mq_open
 228 #define sys_mq_timedsend        compat_sys_mq_timedsend
 229 #define sys_mq_timedreceive     compat_sys_mq_timedreceive
 230 #define sys_mq_notify           compat_sys_mq_notify
 231 #define sys_mq_getsetattr       compat_sys_mq_getsetattr
 232 #define sys_waitid              compat_sys_waitid
 233 #define sys_recv                compat_sys_recv
 234 #define sys_recvfrom            compat_sys_recvfrom
 235 #define sys_setsockopt          compat_sys_setsockopt
 236 #define sys_getsockopt          compat_sys_getsockopt
 237 #define sys_sendmsg             compat_sys_sendmsg
 238 #define sys_recvmsg             compat_sys_recvmsg
 239 #define sys_semctl              compat_sys_semctl
 240 #define sys_msgsnd              compat_sys_msgsnd
 241 #define sys_msgrcv              compat_sys_msgrcv
 242 #define sys_msgctl              compat_sys_msgctl
 243 #define sys_shmat               compat_sys_shmat
 244 #define sys_shmctl              compat_sys_shmctl
 245 #define sys_keyctl              compat_sys_keyctl
 246 #define sys_semtimedop          compat_sys_semtimedop
 247 #define sys_mbind               compat_sys_mbind
 248 #define sys_get_mempolicy       compat_sys_get_mempolicy
 249 #define sys_set_mempolicy       compat_sys_set_mempolicy
 250 #define sys_openat              compat_sys_openat
 251 #define sys_futimesat           compat_sys_futimesat
 252 #define sys_pselect6            compat_sys_pselect6
 253 #define sys_ppoll               compat_sys_ppoll
 254 #define sys_set_robust_list     compat_sys_set_robust_list
 255 #define sys_get_robust_list     compat_sys_get_robust_list
 256 #define sys_sync_file_range2    compat_sys_sync_file_range2_wrapper
 257 #define sys_vmsplice            compat_sys_vmsplice
 258 #define sys_move_pages          compat_sys_move_pages
 259 #define sys_epoll_pwait         compat_sys_epoll_pwait
 260 #define sys_kexec_load          compat_sys_kexec_load
 261 #define sys_utimensat           compat_sys_utimensat
 262 #define sys_signalfd            compat_sys_signalfd
 263 #define sys_fallocate           compat_sys_fallocate_wrapper
 264 #define sys_timerfd_settime     compat_sys_timerfd_settime
 265 #define sys_timerfd_gettime     compat_sys_timerfd_gettime
 266 #define sys_signalfd4           compat_sys_signalfd4
 267 #define sys_preadv              compat_sys_preadv
 268 #define sys_pwritev             compat_sys_pwritev
 269 #define sys_rt_tgsigqueueinfo   compat_sys_rt_tgsigqueueinfo
 270 #define sys_recvmmsg            compat_sys_recvmmsg
 271 #define sys_fanotify_mark       compat_sys_fanotify_mark_wrapper
 272
 273 #undef __SYSCALL
 274 #define __SYSCALL(x, y)         .quad   y       // x
 275 #define __SYSCALL_COMPAT
 276
 277 /*
 278  * The system calls table must be 4KB aligned.
 279  */
 280         .align  12
 281 ENTRY(compat_sys_call_table)
 282 #include <asm/unistd.h>