arch/mips/kernel/scall64-o32.S

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
   7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   8  * Copyright (C) 2001 MIPS Technologies, Inc.
   9  * Copyright (C) 2004 Thiemo Seufer
  10  *
  11  * Hairy, the userspace application uses a different argument passing
  12  * convention than the kernel, so we have to translate things from o32
  13  * to ABI64 calling convention.  64-bit syscalls are also processed
  14  * here for now.
  15  */
  16 #include <linux/errno.h>
  17 #include <asm/asm.h>
  18 #include <asm/asmmacro.h>
  19 #include <asm/irqflags.h>
  20 #include <asm/mipsregs.h>
  21 #include <asm/regdef.h>
  22 #include <asm/stackframe.h>
  23 #include <asm/thread_info.h>
  24 #include <asm/unistd.h>
  25 #include <asm/sysmips.h>
  26
  27         .align  5
  28 NESTED(handle_sys, PT_SIZE, sp)
  29         .set    noat
  30         SAVE_SOME
  31         TRACE_IRQS_ON_RELOAD
  32         STI
  33         .set    at
  34         ld      t1, PT_EPC(sp)          # skip syscall on return
  35
  36         dsubu   t0, v0, __NR_O32_Linux  # check syscall number
  37         sltiu   t0, t0, __NR_O32_Linux_syscalls + 1
  38         daddiu  t1, 4                   # skip to next instruction
  39         sd      t1, PT_EPC(sp)
  40         beqz    t0, not_o32_scall
  41 #if 0
  42  SAVE_ALL
  43  move a1, v0
  44  PRINT("Scall %ld\n")
  45  RESTORE_ALL
  46 #endif
  47
  48         /* We don't want to stumble over broken sign extensions from
  49            userland. O32 does never use the upper half. */
  50         sll     a0, a0, 0
  51         sll     a1, a1, 0
  52         sll     a2, a2, 0
  53         sll     a3, a3, 0
  54
  55         dsll    t0, v0, 3               # offset into table
  56         ld      t2, (sys_call_table - (__NR_O32_Linux * 8))(t0)
  57
  58         sd      a3, PT_R26(sp)          # save a3 for syscall restarting
  59
  60         /*
  61          * More than four arguments.  Try to deal with it by copying the
  62          * stack arguments from the user stack to the kernel stack.
  63          * This Sucks (TM).
  64          *
  65          * We intentionally keep the kernel stack a little below the top of
  66          * userspace so we don't have to do a slower byte accurate check here.
  67          */
  68         ld      t0, PT_R29(sp)          # get old user stack pointer
  69         daddu   t1, t0, 32
  70         bltz    t1, bad_stack
  71
  72 1:      lw      a4, 16(t0)              # argument #5 from usp
  73 2:      lw      a5, 20(t0)              # argument #6 from usp
  74 3:      lw      a6, 24(t0)              # argument #7 from usp
  75 4:      lw      a7, 28(t0)              # argument #8 from usp (for indirect syscalls)
  76
  77         .section __ex_table,"a"
  78         PTR     1b, bad_stack
  79         PTR     2b, bad_stack
  80         PTR     3b, bad_stack
  81         PTR     4b, bad_stack
  82         .previous
  83
  84         li      t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
  85         LONG_L  t0, TI_FLAGS($28)       # syscall tracing enabled?
  86         and     t0, t1, t0
  87         bnez    t0, trace_a_syscall
  88
  89         jalr    t2                      # Do The Real Thing (TM)
  90
  91         li      t0, -EMAXERRNO - 1      # error?
  92         sltu    t0, t0, v0
  93         sd      t0, PT_R7(sp)           # set error flag
  94         beqz    t0, 1f
  95
  96         ld      t1, PT_R2(sp)           # syscall number
  97         dnegu   v0                      # error
  98         sd      t1, PT_R0(sp)           # save it for syscall restarting
  99 1:      sd      v0, PT_R2(sp)           # result
 100
 101 o32_syscall_exit:
 102         j       syscall_exit_partial
 103
 104 /* ------------------------------------------------------------------------ */
 105
 106 trace_a_syscall:
 107         SAVE_STATIC
 108         sd      a4, PT_R8(sp)           # Save argument registers
 109         sd      a5, PT_R9(sp)
 110         sd      a6, PT_R10(sp)
 111         sd      a7, PT_R11(sp)          # For indirect syscalls
 112
 113         move    s0, t2                  # Save syscall pointer
 114         move    a0, sp
 115         jal     syscall_trace_enter
 116
 117         move    t0, s0
 118         RESTORE_STATIC
 119         ld      a0, PT_R4(sp)           # Restore argument registers
 120         ld      a1, PT_R5(sp)
 121         ld      a2, PT_R6(sp)
 122         ld      a3, PT_R7(sp)
 123         ld      a4, PT_R8(sp)
 124         ld      a5, PT_R9(sp)
 125         ld      a6, PT_R10(sp)
 126         ld      a7, PT_R11(sp)          # For indirect syscalls
 127         jalr    t0
 128
 129         li      t0, -EMAXERRNO - 1      # error?
 130         sltu    t0, t0, v0
 131         sd      t0, PT_R7(sp)           # set error flag
 132         beqz    t0, 1f
 133
 134         ld      t1, PT_R2(sp)           # syscall number
 135         dnegu   v0                      # error
 136         sd      t1, PT_R0(sp)           # save it for syscall restarting
 137 1:      sd      v0, PT_R2(sp)           # result
 138
 139         j       syscall_exit
 140
 141 /* ------------------------------------------------------------------------ */
 142
 143         /*
 144          * The stackpointer for a call with more than 4 arguments is bad.
 145          */
 146 bad_stack:
 147         li      v0, EFAULT
 148         sd      v0, PT_R2(sp)
 149         li      t0, 1                   # set error flag
 150         sd      t0, PT_R7(sp)
 151         j       o32_syscall_exit
 152
 153 not_o32_scall:
 154         /*
 155          * This is not an o32 compatibility syscall, pass it on
 156          * to the 64-bit syscall handlers.
 157          */
 158 #ifdef CONFIG_MIPS32_N32
 159         j       handle_sysn32
 160 #else
 161         j       handle_sys64
 162 #endif
 163         END(handle_sys)
 164
 165 LEAF(sys32_syscall)
 166         subu    t0, a0, __NR_O32_Linux  # check syscall number
 167         sltiu   v0, t0, __NR_O32_Linux_syscalls + 1
 168         beqz    t0, einval              # do not recurse
 169         dsll    t1, t0, 3
 170         beqz    v0, einval
 171         ld      t2, sys_call_table(t1)          # syscall routine
 172
 173         move    a0, a1                  # shift argument registers
 174         move    a1, a2
 175         move    a2, a3
 176         move    a3, a4
 177         move    a4, a5
 178         move    a5, a6
 179         move    a6, a7
 180         sd      a0, PT_R4(sp)           # ... and push back a0 - a3, some
 181         sd      a1, PT_R5(sp)           # syscalls expect them there
 182         sd      a2, PT_R6(sp)
 183         sd      a3, PT_R7(sp)
 184         sd      a3, PT_R26(sp)          # update a3 for syscall restarting
 185         jr      t2
 186         /* Unreached */
 187
 188 einval: li      v0, -ENOSYS
 189         jr      ra
 190         END(sys32_syscall)
 191
 192         .align  3
 193         .type   sys_call_table,@object
 194 sys_call_table:
 195         PTR     sys32_syscall                   /* 4000 */
 196         PTR     sys_exit
 197         PTR     __sys_fork
 198         PTR     sys_read
 199         PTR     sys_write
 200         PTR     compat_sys_open                 /* 4005 */
 201         PTR     sys_close
 202         PTR     sys_waitpid
 203         PTR     sys_creat
 204         PTR     sys_link
 205         PTR     sys_unlink                      /* 4010 */
 206         PTR     compat_sys_execve
 207         PTR     sys_chdir
 208         PTR     compat_sys_time
 209         PTR     sys_mknod
 210         PTR     sys_chmod                       /* 4015 */
 211         PTR     sys_lchown
 212         PTR     sys_ni_syscall
 213         PTR     sys_ni_syscall                  /* was sys_stat */
 214         PTR     sys_lseek
 215         PTR     sys_getpid                      /* 4020 */
 216         PTR     compat_sys_mount
 217         PTR     sys_oldumount
 218         PTR     sys_setuid
 219         PTR     sys_getuid
 220         PTR     compat_sys_stime                /* 4025 */
 221         PTR     compat_sys_ptrace
 222         PTR     sys_alarm
 223         PTR     sys_ni_syscall                  /* was sys_fstat */
 224         PTR     sys_pause
 225         PTR     compat_sys_utime                /* 4030 */
 226         PTR     sys_ni_syscall
 227         PTR     sys_ni_syscall
 228         PTR     sys_access
 229         PTR     sys_nice
 230         PTR     sys_ni_syscall                  /* 4035 */
 231         PTR     sys_sync
 232         PTR     sys_kill
 233         PTR     sys_rename
 234         PTR     sys_mkdir
 235         PTR     sys_rmdir                       /* 4040 */
 236         PTR     sys_dup
 237         PTR     sysm_pipe
 238         PTR     compat_sys_times
 239         PTR     sys_ni_syscall
 240         PTR     sys_brk                         /* 4045 */
 241         PTR     sys_setgid
 242         PTR     sys_getgid
 243         PTR     sys_ni_syscall                  /* was signal   2 */
 244         PTR     sys_geteuid
 245         PTR     sys_getegid                     /* 4050 */
 246         PTR     sys_acct
 247         PTR     sys_umount
 248         PTR     sys_ni_syscall
 249         PTR     compat_sys_ioctl
 250         PTR     compat_sys_fcntl                /* 4055 */
 251         PTR     sys_ni_syscall
 252         PTR     sys_setpgid
 253         PTR     sys_ni_syscall
 254         PTR     sys_olduname
 255         PTR     sys_umask                       /* 4060 */
 256         PTR     sys_chroot
 257         PTR     compat_sys_ustat
 258         PTR     sys_dup2
 259         PTR     sys_getppid
 260         PTR     sys_getpgrp                     /* 4065 */
 261         PTR     sys_setsid
 262         PTR     sys_32_sigaction
 263         PTR     sys_sgetmask
 264         PTR     sys_ssetmask
 265         PTR     sys_setreuid                    /* 4070 */
 266         PTR     sys_setregid
 267         PTR     sys32_sigsuspend
 268         PTR     compat_sys_sigpending
 269         PTR     sys_sethostname
 270         PTR     compat_sys_setrlimit            /* 4075 */
 271         PTR     compat_sys_getrlimit
 272         PTR     compat_sys_getrusage
 273         PTR     compat_sys_gettimeofday
 274         PTR     compat_sys_settimeofday
 275         PTR     sys_getgroups                   /* 4080 */
 276         PTR     sys_setgroups
 277         PTR     sys_ni_syscall                  /* old_select */
 278         PTR     sys_symlink
 279         PTR     sys_ni_syscall                  /* was sys_lstat */
 280         PTR     sys_readlink                    /* 4085 */
 281         PTR     sys_uselib
 282         PTR     sys_swapon
 283         PTR     sys_reboot
 284         PTR     compat_sys_old_readdir
 285         PTR     sys_mips_mmap                   /* 4090 */
 286         PTR     sys_munmap
 287         PTR     compat_sys_truncate
 288         PTR     compat_sys_ftruncate
 289         PTR     sys_fchmod
 290         PTR     sys_fchown                      /* 4095 */
 291         PTR     sys_getpriority
 292         PTR     sys_setpriority
 293         PTR     sys_ni_syscall
 294         PTR     compat_sys_statfs
 295         PTR     compat_sys_fstatfs              /* 4100 */
 296         PTR     sys_ni_syscall                  /* sys_ioperm */
 297         PTR     compat_sys_socketcall
 298         PTR     sys_syslog
 299         PTR     compat_sys_setitimer
 300         PTR     compat_sys_getitimer            /* 4105 */
 301         PTR     compat_sys_newstat
 302         PTR     compat_sys_newlstat
 303         PTR     compat_sys_newfstat
 304         PTR     sys_uname
 305         PTR     sys_ni_syscall                  /* sys_ioperm  *//* 4110 */
 306         PTR     sys_vhangup
 307         PTR     sys_ni_syscall                  /* was sys_idle  */
 308         PTR     sys_ni_syscall                  /* sys_vm86 */
 309         PTR     compat_sys_wait4
 310         PTR     sys_swapoff                     /* 4115 */
 311         PTR     compat_sys_sysinfo
 312         PTR     compat_sys_ipc
 313         PTR     sys_fsync
 314         PTR     sys32_sigreturn
 315         PTR     __sys_clone                     /* 4120 */
 316         PTR     sys_setdomainname
 317         PTR     sys_newuname
 318         PTR     sys_ni_syscall                  /* sys_modify_ldt */
 319         PTR     compat_sys_adjtimex
 320         PTR     sys_mprotect                    /* 4125 */
 321         PTR     compat_sys_sigprocmask
 322         PTR     sys_ni_syscall                  /* was creat_module */
 323         PTR     sys_init_module
 324         PTR     sys_delete_module
 325         PTR     sys_ni_syscall                  /* 4130, get_kernel_syms */
 326         PTR     sys_quotactl
 327         PTR     sys_getpgid
 328         PTR     sys_fchdir
 329         PTR     sys_bdflush
 330         PTR     sys_sysfs                       /* 4135 */
 331         PTR     sys_32_personality
 332         PTR     sys_ni_syscall                  /* for afs_syscall */
 333         PTR     sys_setfsuid
 334         PTR     sys_setfsgid
 335         PTR     sys_32_llseek                   /* 4140 */
 336         PTR     compat_sys_getdents
 337         PTR     compat_sys_select
 338         PTR     sys_flock
 339         PTR     sys_msync
 340         PTR     compat_sys_readv                /* 4145 */
 341         PTR     compat_sys_writev
 342         PTR     sys_cacheflush
 343         PTR     sys_cachectl
 344         PTR     sys_sysmips
 345         PTR     sys_ni_syscall                  /* 4150 */
 346         PTR     sys_getsid
 347         PTR     sys_fdatasync
 348         PTR     compat_sys_sysctl
 349         PTR     sys_mlock
 350         PTR     sys_munlock                     /* 4155 */
 351         PTR     sys_mlockall
 352         PTR     sys_munlockall
 353         PTR     sys_sched_setparam
 354         PTR     sys_sched_getparam
 355         PTR     sys_sched_setscheduler          /* 4160 */
 356         PTR     sys_sched_getscheduler
 357         PTR     sys_sched_yield
 358         PTR     sys_sched_get_priority_max
 359         PTR     sys_sched_get_priority_min
 360         PTR     compat_sys_sched_rr_get_interval        /* 4165 */
 361         PTR     compat_sys_nanosleep
 362         PTR     sys_mremap
 363         PTR     sys_accept
 364         PTR     sys_bind
 365         PTR     sys_connect                     /* 4170 */
 366         PTR     sys_getpeername
 367         PTR     sys_getsockname
 368         PTR     sys_getsockopt
 369         PTR     sys_listen
 370         PTR     compat_sys_recv                 /* 4175 */
 371         PTR     compat_sys_recvfrom
 372         PTR     compat_sys_recvmsg
 373         PTR     sys_send
 374         PTR     compat_sys_sendmsg
 375         PTR     sys_sendto                      /* 4180 */
 376         PTR     compat_sys_setsockopt
 377         PTR     sys_shutdown
 378         PTR     sys_socket
 379         PTR     sys_socketpair
 380         PTR     sys_setresuid                   /* 4185 */
 381         PTR     sys_getresuid
 382         PTR     sys_ni_syscall                  /* was query_module */
 383         PTR     sys_poll
 384         PTR     sys_ni_syscall                  /* was nfsservctl */
 385         PTR     sys_setresgid                   /* 4190 */
 386         PTR     sys_getresgid
 387         PTR     sys_prctl
 388         PTR     sys32_rt_sigreturn
 389         PTR     compat_sys_rt_sigaction
 390         PTR     compat_sys_rt_sigprocmask       /* 4195 */
 391         PTR     compat_sys_rt_sigpending
 392         PTR     compat_sys_rt_sigtimedwait
 393         PTR     compat_sys_rt_sigqueueinfo
 394         PTR     compat_sys_rt_sigsuspend
 395         PTR     sys_32_pread                    /* 4200 */
 396         PTR     sys_32_pwrite
 397         PTR     sys_chown
 398         PTR     sys_getcwd
 399         PTR     sys_capget
 400         PTR     sys_capset                      /* 4205 */
 401         PTR     compat_sys_sigaltstack
 402         PTR     compat_sys_sendfile
 403         PTR     sys_ni_syscall
 404         PTR     sys_ni_syscall
 405         PTR     sys_mips_mmap2                  /* 4210 */
 406         PTR     sys_32_truncate64
 407         PTR     sys_32_ftruncate64
 408         PTR     sys_newstat
 409         PTR     sys_newlstat
 410         PTR     sys_newfstat                    /* 4215 */
 411         PTR     sys_pivot_root
 412         PTR     sys_mincore
 413         PTR     sys_madvise
 414         PTR     sys_getdents64
 415         PTR     compat_sys_fcntl64              /* 4220 */
 416         PTR     sys_ni_syscall
 417         PTR     sys_gettid
 418         PTR     sys32_readahead
 419         PTR     sys_setxattr
 420         PTR     sys_lsetxattr                   /* 4225 */
 421         PTR     sys_fsetxattr
 422         PTR     sys_getxattr
 423         PTR     sys_lgetxattr
 424         PTR     sys_fgetxattr
 425         PTR     sys_listxattr                   /* 4230 */
 426         PTR     sys_llistxattr
 427         PTR     sys_flistxattr
 428         PTR     sys_removexattr
 429         PTR     sys_lremovexattr
 430         PTR     sys_fremovexattr                /* 4235 */
 431         PTR     sys_tkill
 432         PTR     sys_sendfile64
 433         PTR     compat_sys_futex
 434         PTR     compat_sys_sched_setaffinity
 435         PTR     compat_sys_sched_getaffinity    /* 4240 */
 436         PTR     compat_sys_io_setup
 437         PTR     sys_io_destroy
 438         PTR     compat_sys_io_getevents
 439         PTR     compat_sys_io_submit
 440         PTR     sys_io_cancel                   /* 4245 */
 441         PTR     sys_exit_group
 442         PTR     compat_sys_lookup_dcookie
 443         PTR     sys_epoll_create
 444         PTR     sys_epoll_ctl
 445         PTR     sys_epoll_wait                  /* 4250 */
 446         PTR     sys_remap_file_pages
 447         PTR     sys_set_tid_address
 448         PTR     sys_restart_syscall
 449         PTR     sys32_fadvise64_64
 450         PTR     compat_sys_statfs64             /* 4255 */
 451         PTR     compat_sys_fstatfs64
 452         PTR     compat_sys_timer_create
 453         PTR     compat_sys_timer_settime
 454         PTR     compat_sys_timer_gettime
 455         PTR     sys_timer_getoverrun            /* 4260 */
 456         PTR     sys_timer_delete
 457         PTR     compat_sys_clock_settime
 458         PTR     compat_sys_clock_gettime
 459         PTR     compat_sys_clock_getres
 460         PTR     compat_sys_clock_nanosleep      /* 4265 */
 461         PTR     sys_tgkill
 462         PTR     compat_sys_utimes
 463         PTR     sys_ni_syscall                  /* sys_mbind */
 464         PTR     sys_ni_syscall                  /* sys_get_mempolicy */
 465         PTR     sys_ni_syscall                  /* 4270 sys_set_mempolicy */
 466         PTR     compat_sys_mq_open
 467         PTR     sys_mq_unlink
 468         PTR     compat_sys_mq_timedsend
 469         PTR     compat_sys_mq_timedreceive
 470         PTR     compat_sys_mq_notify            /* 4275 */
 471         PTR     compat_sys_mq_getsetattr
 472         PTR     sys_ni_syscall                  /* sys_vserver */
 473         PTR     compat_sys_waitid
 474         PTR     sys_ni_syscall                  /* available, was setaltroot */
 475         PTR     sys_add_key                     /* 4280 */
 476         PTR     sys_request_key
 477         PTR     sys_keyctl
 478         PTR     sys_set_thread_area
 479         PTR     sys_inotify_init
 480         PTR     sys_inotify_add_watch           /* 4285 */
 481         PTR     sys_inotify_rm_watch
 482         PTR     sys_migrate_pages
 483         PTR     compat_sys_openat
 484         PTR     sys_mkdirat
 485         PTR     sys_mknodat                     /* 4290 */
 486         PTR     sys_fchownat
 487         PTR     compat_sys_futimesat
 488         PTR     sys_newfstatat
 489         PTR     sys_unlinkat
 490         PTR     sys_renameat                    /* 4295 */
 491         PTR     sys_linkat
 492         PTR     sys_symlinkat
 493         PTR     sys_readlinkat
 494         PTR     sys_fchmodat
 495         PTR     sys_faccessat                   /* 4300 */
 496         PTR     compat_sys_pselect6
 497         PTR     compat_sys_ppoll
 498         PTR     sys_unshare
 499         PTR     sys_splice
 500         PTR     sys32_sync_file_range           /* 4305 */
 501         PTR     sys_tee
 502         PTR     compat_sys_vmsplice
 503         PTR     compat_sys_move_pages
 504         PTR     compat_sys_set_robust_list
 505         PTR     compat_sys_get_robust_list      /* 4310 */
 506         PTR     compat_sys_kexec_load
 507         PTR     sys_getcpu
 508         PTR     compat_sys_epoll_pwait
 509         PTR     sys_ioprio_set
 510         PTR     sys_ioprio_get                  /* 4315 */
 511         PTR     compat_sys_utimensat
 512         PTR     compat_sys_signalfd
 513         PTR     sys_ni_syscall                  /* was timerfd */
 514         PTR     sys_eventfd
 515         PTR     sys32_fallocate                 /* 4320 */
 516         PTR     sys_timerfd_create
 517         PTR     compat_sys_timerfd_gettime
 518         PTR     compat_sys_timerfd_settime
 519         PTR     compat_sys_signalfd4
 520         PTR     sys_eventfd2                    /* 4325 */
 521         PTR     sys_epoll_create1
 522         PTR     sys_dup3
 523         PTR     sys_pipe2
 524         PTR     sys_inotify_init1
 525         PTR     compat_sys_preadv               /* 4330 */
 526         PTR     compat_sys_pwritev
 527         PTR     compat_sys_rt_tgsigqueueinfo
 528         PTR     sys_perf_event_open
 529         PTR     sys_accept4
 530         PTR     compat_sys_recvmmsg             /* 4335 */
 531         PTR     sys_fanotify_init
 532         PTR     compat_sys_fanotify_mark
 533         PTR     sys_prlimit64
 534         PTR     sys_name_to_handle_at
 535         PTR     compat_sys_open_by_handle_at    /* 4340 */
 536         PTR     compat_sys_clock_adjtime
 537         PTR     sys_syncfs
 538         PTR     compat_sys_sendmmsg
 539         PTR     sys_setns
 540         PTR     compat_sys_process_vm_readv     /* 4345 */
 541         PTR     compat_sys_process_vm_writev
 542         PTR     sys_kcmp
 543         PTR     sys_finit_module
 544         .size   sys_call_table,.-sys_call_table