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, (sys32_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_WORK_SYSCALL_ENTRY
  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         /*
 116          * absolute syscall number is in v0 unless we called syscall(__NR_###)
 117          * where the real syscall number is in a0
 118          * note: NR_syscall is the first O32 syscall but the macro is
 119          * only defined when compiling with -mabi=32 (CONFIG_32BIT)
 120          * therefore __NR_O32_Linux is used (4000)
 121          */
 122         .set    push
 123         .set    reorder
 124         subu    t1, v0,  __NR_O32_Linux
 125         move    a1, v0
 126         bnez    t1, 1f /* __NR_syscall at offset 0 */
 127         lw      a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
 128         .set    pop
 129
 130 1:      jal     syscall_trace_enter
 131
 132         bltz    v0, 2f                  # seccomp failed? Skip syscall
 133
 134         move    t0, s0
 135         RESTORE_STATIC
 136         ld      a0, PT_R4(sp)           # Restore argument registers
 137         ld      a1, PT_R5(sp)
 138         ld      a2, PT_R6(sp)
 139         ld      a3, PT_R7(sp)
 140         ld      a4, PT_R8(sp)
 141         ld      a5, PT_R9(sp)
 142         ld      a6, PT_R10(sp)
 143         ld      a7, PT_R11(sp)          # For indirect syscalls
 144         jalr    t0
 145
 146         li      t0, -EMAXERRNO - 1      # error?
 147         sltu    t0, t0, v0
 148         sd      t0, PT_R7(sp)           # set error flag
 149         beqz    t0, 1f
 150
 151         ld      t1, PT_R2(sp)           # syscall number
 152         dnegu   v0                      # error
 153         sd      t1, PT_R0(sp)           # save it for syscall restarting
 154 1:      sd      v0, PT_R2(sp)           # result
 155
 156 2:      j       syscall_exit
 157
 158 /* ------------------------------------------------------------------------ */
 159
 160         /*
 161          * The stackpointer for a call with more than 4 arguments is bad.
 162          */
 163 bad_stack:
 164         li      v0, EFAULT
 165         sd      v0, PT_R2(sp)
 166         li      t0, 1                   # set error flag
 167         sd      t0, PT_R7(sp)
 168         j       o32_syscall_exit
 169
 170 not_o32_scall:
 171         /*
 172          * This is not an o32 compatibility syscall, pass it on
 173          * to the 64-bit syscall handlers.
 174          */
 175 #ifdef CONFIG_MIPS32_N32
 176         j       handle_sysn32
 177 #else
 178         j       handle_sys64
 179 #endif
 180         END(handle_sys)
 181
 182 LEAF(sys32_syscall)
 183         subu    t0, a0, __NR_O32_Linux  # check syscall number
 184         sltiu   v0, t0, __NR_O32_Linux_syscalls + 1
 185         beqz    t0, einval              # do not recurse
 186         dsll    t1, t0, 3
 187         beqz    v0, einval
 188         ld      t2, sys32_call_table(t1)                # syscall routine
 189
 190         move    a0, a1                  # shift argument registers
 191         move    a1, a2
 192         move    a2, a3
 193         move    a3, a4
 194         move    a4, a5
 195         move    a5, a6
 196         move    a6, a7
 197         sd      a0, PT_R4(sp)           # ... and push back a0 - a3, some
 198         sd      a1, PT_R5(sp)           # syscalls expect them there
 199         sd      a2, PT_R6(sp)
 200         sd      a3, PT_R7(sp)
 201         sd      a3, PT_R26(sp)          # update a3 for syscall restarting
 202         jr      t2
 203         /* Unreached */
 204
 205 einval: li      v0, -ENOSYS
 206         jr      ra
 207         END(sys32_syscall)
 208
 209         .align  3
 210         .type   sys32_call_table,@object
 211 EXPORT(sys32_call_table)
 212         PTR     sys32_syscall                   /* 4000 */
 213         PTR     sys_exit
 214         PTR     __sys_fork
 215         PTR     sys_read
 216         PTR     sys_write
 217         PTR     compat_sys_open                 /* 4005 */
 218         PTR     sys_close
 219         PTR     sys_waitpid
 220         PTR     sys_creat
 221         PTR     sys_link
 222         PTR     sys_unlink                      /* 4010 */
 223         PTR     compat_sys_execve
 224         PTR     sys_chdir
 225         PTR     compat_sys_time
 226         PTR     sys_mknod
 227         PTR     sys_chmod                       /* 4015 */
 228         PTR     sys_lchown
 229         PTR     sys_ni_syscall
 230         PTR     sys_ni_syscall                  /* was sys_stat */
 231         PTR     sys_lseek
 232         PTR     sys_getpid                      /* 4020 */
 233         PTR     compat_sys_mount
 234         PTR     sys_oldumount
 235         PTR     sys_setuid
 236         PTR     sys_getuid
 237         PTR     compat_sys_stime                /* 4025 */
 238         PTR     compat_sys_ptrace
 239         PTR     sys_alarm
 240         PTR     sys_ni_syscall                  /* was sys_fstat */
 241         PTR     sys_pause
 242         PTR     compat_sys_utime                /* 4030 */
 243         PTR     sys_ni_syscall
 244         PTR     sys_ni_syscall
 245         PTR     sys_access
 246         PTR     sys_nice
 247         PTR     sys_ni_syscall                  /* 4035 */
 248         PTR     sys_sync
 249         PTR     sys_kill
 250         PTR     sys_rename
 251         PTR     sys_mkdir
 252         PTR     sys_rmdir                       /* 4040 */
 253         PTR     sys_dup
 254         PTR     sysm_pipe
 255         PTR     compat_sys_times
 256         PTR     sys_ni_syscall
 257         PTR     sys_brk                         /* 4045 */
 258         PTR     sys_setgid
 259         PTR     sys_getgid
 260         PTR     sys_ni_syscall                  /* was signal   2 */
 261         PTR     sys_geteuid
 262         PTR     sys_getegid                     /* 4050 */
 263         PTR     sys_acct
 264         PTR     sys_umount
 265         PTR     sys_ni_syscall
 266         PTR     compat_sys_ioctl
 267         PTR     compat_sys_fcntl                /* 4055 */
 268         PTR     sys_ni_syscall
 269         PTR     sys_setpgid
 270         PTR     sys_ni_syscall
 271         PTR     sys_olduname
 272         PTR     sys_umask                       /* 4060 */
 273         PTR     sys_chroot
 274         PTR     compat_sys_ustat
 275         PTR     sys_dup2
 276         PTR     sys_getppid
 277         PTR     sys_getpgrp                     /* 4065 */
 278         PTR     sys_setsid
 279         PTR     sys_32_sigaction
 280         PTR     sys_sgetmask
 281         PTR     sys_ssetmask
 282         PTR     sys_setreuid                    /* 4070 */
 283         PTR     sys_setregid
 284         PTR     sys32_sigsuspend
 285         PTR     compat_sys_sigpending
 286         PTR     sys_sethostname
 287         PTR     compat_sys_setrlimit            /* 4075 */
 288         PTR     compat_sys_getrlimit
 289         PTR     compat_sys_getrusage
 290         PTR     compat_sys_gettimeofday
 291         PTR     compat_sys_settimeofday
 292         PTR     sys_getgroups                   /* 4080 */
 293         PTR     sys_setgroups
 294         PTR     sys_ni_syscall                  /* old_select */
 295         PTR     sys_symlink
 296         PTR     sys_ni_syscall                  /* was sys_lstat */
 297         PTR     sys_readlink                    /* 4085 */
 298         PTR     sys_uselib
 299         PTR     sys_swapon
 300         PTR     sys_reboot
 301         PTR     compat_sys_old_readdir
 302         PTR     sys_mips_mmap                   /* 4090 */
 303         PTR     sys_munmap
 304         PTR     compat_sys_truncate
 305         PTR     compat_sys_ftruncate
 306         PTR     sys_fchmod
 307         PTR     sys_fchown                      /* 4095 */
 308         PTR     sys_getpriority
 309         PTR     sys_setpriority
 310         PTR     sys_ni_syscall
 311         PTR     compat_sys_statfs
 312         PTR     compat_sys_fstatfs              /* 4100 */
 313         PTR     sys_ni_syscall                  /* sys_ioperm */
 314         PTR     compat_sys_socketcall
 315         PTR     sys_syslog
 316         PTR     compat_sys_setitimer
 317         PTR     compat_sys_getitimer            /* 4105 */
 318         PTR     compat_sys_newstat
 319         PTR     compat_sys_newlstat
 320         PTR     compat_sys_newfstat
 321         PTR     sys_uname
 322         PTR     sys_ni_syscall                  /* sys_ioperm  *//* 4110 */
 323         PTR     sys_vhangup
 324         PTR     sys_ni_syscall                  /* was sys_idle  */
 325         PTR     sys_ni_syscall                  /* sys_vm86 */
 326         PTR     compat_sys_wait4
 327         PTR     sys_swapoff                     /* 4115 */
 328         PTR     compat_sys_sysinfo
 329         PTR     compat_sys_ipc
 330         PTR     sys_fsync
 331         PTR     sys32_sigreturn
 332         PTR     __sys_clone                     /* 4120 */
 333         PTR     sys_setdomainname
 334         PTR     sys_newuname
 335         PTR     sys_ni_syscall                  /* sys_modify_ldt */
 336         PTR     compat_sys_adjtimex
 337         PTR     sys_mprotect                    /* 4125 */
 338         PTR     compat_sys_sigprocmask
 339         PTR     sys_ni_syscall                  /* was creat_module */
 340         PTR     sys_init_module
 341         PTR     sys_delete_module
 342         PTR     sys_ni_syscall                  /* 4130, get_kernel_syms */
 343         PTR     sys_quotactl
 344         PTR     sys_getpgid
 345         PTR     sys_fchdir
 346         PTR     sys_bdflush
 347         PTR     sys_sysfs                       /* 4135 */
 348         PTR     sys_32_personality
 349         PTR     sys_ni_syscall                  /* for afs_syscall */
 350         PTR     sys_setfsuid
 351         PTR     sys_setfsgid
 352         PTR     sys_32_llseek                   /* 4140 */
 353         PTR     compat_sys_getdents
 354         PTR     compat_sys_select
 355         PTR     sys_flock
 356         PTR     sys_msync
 357         PTR     compat_sys_readv                /* 4145 */
 358         PTR     compat_sys_writev
 359         PTR     sys_cacheflush
 360         PTR     sys_cachectl
 361         PTR     sys_sysmips
 362         PTR     sys_ni_syscall                  /* 4150 */
 363         PTR     sys_getsid
 364         PTR     sys_fdatasync
 365         PTR     compat_sys_sysctl
 366         PTR     sys_mlock
 367         PTR     sys_munlock                     /* 4155 */
 368         PTR     sys_mlockall
 369         PTR     sys_munlockall
 370         PTR     sys_sched_setparam
 371         PTR     sys_sched_getparam
 372         PTR     sys_sched_setscheduler          /* 4160 */
 373         PTR     sys_sched_getscheduler
 374         PTR     sys_sched_yield
 375         PTR     sys_sched_get_priority_max
 376         PTR     sys_sched_get_priority_min
 377         PTR     compat_sys_sched_rr_get_interval        /* 4165 */
 378         PTR     compat_sys_nanosleep
 379         PTR     sys_mremap
 380         PTR     sys_accept
 381         PTR     sys_bind
 382         PTR     sys_connect                     /* 4170 */
 383         PTR     sys_getpeername
 384         PTR     sys_getsockname
 385         PTR     sys_getsockopt
 386         PTR     sys_listen
 387         PTR     compat_sys_recv                 /* 4175 */
 388         PTR     compat_sys_recvfrom
 389         PTR     compat_sys_recvmsg
 390         PTR     sys_send
 391         PTR     compat_sys_sendmsg
 392         PTR     sys_sendto                      /* 4180 */
 393         PTR     compat_sys_setsockopt
 394         PTR     sys_shutdown
 395         PTR     sys_socket
 396         PTR     sys_socketpair
 397         PTR     sys_setresuid                   /* 4185 */
 398         PTR     sys_getresuid
 399         PTR     sys_ni_syscall                  /* was query_module */
 400         PTR     sys_poll
 401         PTR     sys_ni_syscall                  /* was nfsservctl */
 402         PTR     sys_setresgid                   /* 4190 */
 403         PTR     sys_getresgid
 404         PTR     sys_prctl
 405         PTR     sys32_rt_sigreturn
 406         PTR     compat_sys_rt_sigaction
 407         PTR     compat_sys_rt_sigprocmask       /* 4195 */
 408         PTR     compat_sys_rt_sigpending
 409         PTR     compat_sys_rt_sigtimedwait
 410         PTR     compat_sys_rt_sigqueueinfo
 411         PTR     compat_sys_rt_sigsuspend
 412         PTR     sys_32_pread                    /* 4200 */
 413         PTR     sys_32_pwrite
 414         PTR     sys_chown
 415         PTR     sys_getcwd
 416         PTR     sys_capget
 417         PTR     sys_capset                      /* 4205 */
 418         PTR     compat_sys_sigaltstack
 419         PTR     compat_sys_sendfile
 420         PTR     sys_ni_syscall
 421         PTR     sys_ni_syscall
 422         PTR     sys_mips_mmap2                  /* 4210 */
 423         PTR     sys_32_truncate64
 424         PTR     sys_32_ftruncate64
 425         PTR     sys_newstat
 426         PTR     sys_newlstat
 427         PTR     sys_newfstat                    /* 4215 */
 428         PTR     sys_pivot_root
 429         PTR     sys_mincore
 430         PTR     sys_madvise
 431         PTR     sys_getdents64
 432         PTR     compat_sys_fcntl64              /* 4220 */
 433         PTR     sys_ni_syscall
 434         PTR     sys_gettid
 435         PTR     sys32_readahead
 436         PTR     sys_setxattr
 437         PTR     sys_lsetxattr                   /* 4225 */
 438         PTR     sys_fsetxattr
 439         PTR     sys_getxattr
 440         PTR     sys_lgetxattr
 441         PTR     sys_fgetxattr
 442         PTR     sys_listxattr                   /* 4230 */
 443         PTR     sys_llistxattr
 444         PTR     sys_flistxattr
 445         PTR     sys_removexattr
 446         PTR     sys_lremovexattr
 447         PTR     sys_fremovexattr                /* 4235 */
 448         PTR     sys_tkill
 449         PTR     sys_sendfile64
 450         PTR     compat_sys_futex
 451         PTR     compat_sys_sched_setaffinity
 452         PTR     compat_sys_sched_getaffinity    /* 4240 */
 453         PTR     compat_sys_io_setup
 454         PTR     sys_io_destroy
 455         PTR     compat_sys_io_getevents
 456         PTR     compat_sys_io_submit
 457         PTR     sys_io_cancel                   /* 4245 */
 458         PTR     sys_exit_group
 459         PTR     compat_sys_lookup_dcookie
 460         PTR     sys_epoll_create
 461         PTR     sys_epoll_ctl
 462         PTR     sys_epoll_wait                  /* 4250 */
 463         PTR     sys_remap_file_pages
 464         PTR     sys_set_tid_address
 465         PTR     sys_restart_syscall
 466         PTR     sys32_fadvise64_64
 467         PTR     compat_sys_statfs64             /* 4255 */
 468         PTR     compat_sys_fstatfs64
 469         PTR     compat_sys_timer_create
 470         PTR     compat_sys_timer_settime
 471         PTR     compat_sys_timer_gettime
 472         PTR     sys_timer_getoverrun            /* 4260 */
 473         PTR     sys_timer_delete
 474         PTR     compat_sys_clock_settime
 475         PTR     compat_sys_clock_gettime
 476         PTR     compat_sys_clock_getres
 477         PTR     compat_sys_clock_nanosleep      /* 4265 */
 478         PTR     sys_tgkill
 479         PTR     compat_sys_utimes
 480         PTR     compat_sys_mbind
 481         PTR     compat_sys_get_mempolicy
 482         PTR     compat_sys_set_mempolicy        /* 4270 */
 483         PTR     compat_sys_mq_open
 484         PTR     sys_mq_unlink
 485         PTR     compat_sys_mq_timedsend
 486         PTR     compat_sys_mq_timedreceive
 487         PTR     compat_sys_mq_notify            /* 4275 */
 488         PTR     compat_sys_mq_getsetattr
 489         PTR     sys_ni_syscall                  /* sys_vserver */
 490         PTR     compat_sys_waitid
 491         PTR     sys_ni_syscall                  /* available, was setaltroot */
 492         PTR     sys_add_key                     /* 4280 */
 493         PTR     sys_request_key
 494         PTR     sys_keyctl
 495         PTR     sys_set_thread_area
 496         PTR     sys_inotify_init
 497         PTR     sys_inotify_add_watch           /* 4285 */
 498         PTR     sys_inotify_rm_watch
 499         PTR     compat_sys_migrate_pages
 500         PTR     compat_sys_openat
 501         PTR     sys_mkdirat
 502         PTR     sys_mknodat                     /* 4290 */
 503         PTR     sys_fchownat
 504         PTR     compat_sys_futimesat
 505         PTR     sys_newfstatat
 506         PTR     sys_unlinkat
 507         PTR     sys_renameat                    /* 4295 */
 508         PTR     sys_linkat
 509         PTR     sys_symlinkat
 510         PTR     sys_readlinkat
 511         PTR     sys_fchmodat
 512         PTR     sys_faccessat                   /* 4300 */
 513         PTR     compat_sys_pselect6
 514         PTR     compat_sys_ppoll
 515         PTR     sys_unshare
 516         PTR     sys_splice
 517         PTR     sys32_sync_file_range           /* 4305 */
 518         PTR     sys_tee
 519         PTR     compat_sys_vmsplice
 520         PTR     compat_sys_move_pages
 521         PTR     compat_sys_set_robust_list
 522         PTR     compat_sys_get_robust_list      /* 4310 */
 523         PTR     compat_sys_kexec_load
 524         PTR     sys_getcpu
 525         PTR     compat_sys_epoll_pwait
 526         PTR     sys_ioprio_set
 527         PTR     sys_ioprio_get                  /* 4315 */
 528         PTR     compat_sys_utimensat
 529         PTR     compat_sys_signalfd
 530         PTR     sys_ni_syscall                  /* was timerfd */
 531         PTR     sys_eventfd
 532         PTR     sys32_fallocate                 /* 4320 */
 533         PTR     sys_timerfd_create
 534         PTR     compat_sys_timerfd_gettime
 535         PTR     compat_sys_timerfd_settime
 536         PTR     compat_sys_signalfd4
 537         PTR     sys_eventfd2                    /* 4325 */
 538         PTR     sys_epoll_create1
 539         PTR     sys_dup3
 540         PTR     sys_pipe2
 541         PTR     sys_inotify_init1
 542         PTR     compat_sys_preadv               /* 4330 */
 543         PTR     compat_sys_pwritev
 544         PTR     compat_sys_rt_tgsigqueueinfo
 545         PTR     sys_perf_event_open
 546         PTR     sys_accept4
 547         PTR     compat_sys_recvmmsg             /* 4335 */
 548         PTR     sys_fanotify_init
 549         PTR     compat_sys_fanotify_mark
 550         PTR     sys_prlimit64
 551         PTR     sys_name_to_handle_at
 552         PTR     compat_sys_open_by_handle_at    /* 4340 */
 553         PTR     compat_sys_clock_adjtime
 554         PTR     sys_syncfs
 555         PTR     compat_sys_sendmmsg
 556         PTR     sys_setns
 557         PTR     compat_sys_process_vm_readv     /* 4345 */
 558         PTR     compat_sys_process_vm_writev
 559         PTR     sys_kcmp
 560         PTR     sys_finit_module
 561         PTR     sys_sched_setattr
 562         PTR     sys_sched_getattr               /* 4350 */
 563         PTR     sys_renameat2
 564         PTR     sys_seccomp
 565         .size   sys32_call_table,.-sys32_call_table