arch/mips/kernel/scall32-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) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
   7  * Copyright (C) 2001 MIPS Technologies, Inc.
   8  * Copyright (C) 2004 Thiemo Seufer
   9  * Copyright (C) 2014 Imagination Technologies Ltd.
  10  */
  11 #include <linux/errno.h>
  12 #include <asm/asm.h>
  13 #include <asm/asmmacro.h>
  14 #include <asm/irqflags.h>
  15 #include <asm/mipsregs.h>
  16 #include <asm/regdef.h>
  17 #include <asm/stackframe.h>
  18 #include <asm/isadep.h>
  19 #include <asm/sysmips.h>
  20 #include <asm/thread_info.h>
  21 #include <asm/unistd.h>
  22 #include <asm/war.h>
  23 #include <asm/asm-offsets.h>
  24
  25 /* Highest syscall used of any syscall flavour */
  26 #define MAX_SYSCALL_NO  __NR_O32_Linux + __NR_O32_Linux_syscalls
  27
  28         .align  5
  29 NESTED(handle_sys, PT_SIZE, sp)
  30         .set    noat
  31         SAVE_SOME
  32         TRACE_IRQS_ON_RELOAD
  33         STI
  34         .set    at
  35
  36         lw      t1, PT_EPC(sp)          # skip syscall on return
  37
  38         subu    v0, v0, __NR_O32_Linux  # check syscall number
  39         sltiu   t0, v0, __NR_O32_Linux_syscalls + 1
  40         addiu   t1, 4                   # skip to next instruction
  41         sw      t1, PT_EPC(sp)
  42         beqz    t0, illegal_syscall
  43
  44         sll     t0, v0, 2
  45         la      t1, sys_call_table
  46         addu    t1, t0
  47         lw      t2, (t1)                # syscall routine
  48         beqz    t2, illegal_syscall
  49
  50         sw      a3, PT_R26(sp)          # save a3 for syscall restarting
  51
  52         /*
  53          * More than four arguments.  Try to deal with it by copying the
  54          * stack arguments from the user stack to the kernel stack.
  55          * This Sucks (TM).
  56          */
  57         lw      t0, PT_R29(sp)          # get old user stack pointer
  58
  59         /*
  60          * We intentionally keep the kernel stack a little below the top of
  61          * userspace so we don't have to do a slower byte accurate check here.
  62          */
  63         lw      t5, TI_ADDR_LIMIT($28)
  64         addu    t4, t0, 32
  65         and     t5, t4
  66         bltz    t5, bad_stack           # -> sp is bad
  67
  68         /*
  69          * Ok, copy the args from the luser stack to the kernel stack.
  70          * t3 is the precomputed number of instruction bytes needed to
  71          * load or store arguments 6-8.
  72          */
  73
  74         .set    push
  75         .set    noreorder
  76         .set    nomacro
  77
  78 1:      user_lw(t5, 16(t0))             # argument #5 from usp
  79 4:      user_lw(t6, 20(t0))             # argument #6 from usp
  80 3:      user_lw(t7, 24(t0))             # argument #7 from usp
  81 2:      user_lw(t8, 28(t0))             # argument #8 from usp
  82
  83         sw      t5, 16(sp)              # argument #5 to ksp
  84         sw      t6, 20(sp)              # argument #6 to ksp
  85         sw      t7, 24(sp)              # argument #7 to ksp
  86         sw      t8, 28(sp)              # argument #8 to ksp
  87         .set    pop
  88
  89         .section __ex_table,"a"
  90         PTR     1b,bad_stack
  91         PTR     2b,bad_stack
  92         PTR     3b,bad_stack
  93         PTR     4b,bad_stack
  94         .previous
  95
  96         lw      t0, TI_FLAGS($28)       # syscall tracing enabled?
  97         li      t1, _TIF_WORK_SYSCALL_ENTRY
  98         and     t0, t1
  99         bnez    t0, syscall_trace_entry # -> yes
 100
 101         jalr    t2                      # Do The Real Thing (TM)
 102
 103         li      t0, -EMAXERRNO - 1      # error?
 104         sltu    t0, t0, v0
 105         sw      t0, PT_R7(sp)           # set error flag
 106         beqz    t0, 1f
 107
 108         lw      t1, PT_R2(sp)           # syscall number
 109         negu    v0                      # error
 110         sw      t1, PT_R0(sp)           # save it for syscall restarting
 111 1:      sw      v0, PT_R2(sp)           # result
 112
 113 o32_syscall_exit:
 114         j       syscall_exit_partial
 115
 116 /* ------------------------------------------------------------------------ */
 117
 118 syscall_trace_entry:
 119         SAVE_STATIC
 120         move    s0, t2
 121         move    a0, sp
 122
 123         /*
 124          * syscall number is in v0 unless we called syscall(__NR_###)
 125          * where the real syscall number is in a0
 126          */
 127         addiu   a1, v0,  __NR_O32_Linux
 128         bnez    v0, 1f /* __NR_syscall at offset 0 */
 129         lw      a1, PT_R4(sp)
 130
 131 1:      jal     syscall_trace_enter
 132
 133         bltz    v0, 2f                  # seccomp failed? Skip syscall
 134
 135         move    t0, s0
 136         RESTORE_STATIC
 137         lw      a0, PT_R4(sp)           # Restore argument registers
 138         lw      a1, PT_R5(sp)
 139         lw      a2, PT_R6(sp)
 140         lw      a3, PT_R7(sp)
 141         jalr    t0
 142
 143         li      t0, -EMAXERRNO - 1      # error?
 144         sltu    t0, t0, v0
 145         sw      t0, PT_R7(sp)           # set error flag
 146         beqz    t0, 1f
 147
 148         lw      t1, PT_R2(sp)           # syscall number
 149         negu    v0                      # error
 150         sw      t1, PT_R0(sp)           # save it for syscall restarting
 151 1:      sw      v0, PT_R2(sp)           # result
 152
 153 2:      j       syscall_exit
 154
 155 /* ------------------------------------------------------------------------ */
 156
 157         /*
 158          * The stackpointer for a call with more than 4 arguments is bad.
 159          * We probably should handle this case a bit more drastic.
 160          */
 161 bad_stack:
 162         li      v0, EFAULT
 163         sw      v0, PT_R2(sp)
 164         li      t0, 1                           # set error flag
 165         sw      t0, PT_R7(sp)
 166         j       o32_syscall_exit
 167
 168         /*
 169          * The system call does not exist in this kernel
 170          */
 171 illegal_syscall:
 172         li      v0, ENOSYS                      # error
 173         sw      v0, PT_R2(sp)
 174         li      t0, 1                           # set error flag
 175         sw      t0, PT_R7(sp)
 176         j       o32_syscall_exit
 177         END(handle_sys)
 178
 179         LEAF(sys_syscall)
 180         subu    t0, a0, __NR_O32_Linux  # check syscall number
 181         sltiu   v0, t0, __NR_O32_Linux_syscalls + 1
 182         beqz    t0, einval              # do not recurse
 183         sll     t1, t0, 2
 184         beqz    v0, einval
 185         lw      t2, sys_call_table(t1)          # syscall routine
 186
 187         /* Some syscalls like execve get their arguments from struct pt_regs
 188            and claim zero arguments in the syscall table. Thus we have to
 189            assume the worst case and shuffle around all potential arguments.
 190            If you want performance, don't use indirect syscalls. */
 191
 192         move    a0, a1                          # shift argument registers
 193         move    a1, a2
 194         move    a2, a3
 195         lw      a3, 16(sp)
 196         lw      t4, 20(sp)
 197         lw      t5, 24(sp)
 198         lw      t6, 28(sp)
 199         sw      t4, 16(sp)
 200         sw      t5, 20(sp)
 201         sw      t6, 24(sp)
 202         sw      a0, PT_R4(sp)                   # .. and push back a0 - a3, some
 203         sw      a1, PT_R5(sp)                   # syscalls expect them there
 204         sw      a2, PT_R6(sp)
 205         sw      a3, PT_R7(sp)
 206         sw      a3, PT_R26(sp)                  # update a3 for syscall restarting
 207         jr      t2
 208         /* Unreached */
 209
 210 einval: li      v0, -ENOSYS
 211         jr      ra
 212         END(sys_syscall)
 213
 214         .align  2
 215         .type   sys_call_table, @object
 216 EXPORT(sys_call_table)
 217         PTR     sys_syscall                     /* 4000 */
 218         PTR     sys_exit
 219         PTR     __sys_fork
 220         PTR     sys_read
 221         PTR     sys_write
 222         PTR     sys_open                        /* 4005 */
 223         PTR     sys_close
 224         PTR     sys_waitpid
 225         PTR     sys_creat
 226         PTR     sys_link
 227         PTR     sys_unlink                      /* 4010 */
 228         PTR     sys_execve
 229         PTR     sys_chdir
 230         PTR     sys_time
 231         PTR     sys_mknod
 232         PTR     sys_chmod                       /* 4015 */
 233         PTR     sys_lchown
 234         PTR     sys_ni_syscall
 235         PTR     sys_ni_syscall                  /* was sys_stat */
 236         PTR     sys_lseek
 237         PTR     sys_getpid                      /* 4020 */
 238         PTR     sys_mount
 239         PTR     sys_oldumount
 240         PTR     sys_setuid
 241         PTR     sys_getuid
 242         PTR     sys_stime                       /* 4025 */
 243         PTR     sys_ptrace
 244         PTR     sys_alarm
 245         PTR     sys_ni_syscall                  /* was sys_fstat */
 246         PTR     sys_pause
 247         PTR     sys_utime                       /* 4030 */
 248         PTR     sys_ni_syscall
 249         PTR     sys_ni_syscall
 250         PTR     sys_access
 251         PTR     sys_nice
 252         PTR     sys_ni_syscall                  /* 4035 */
 253         PTR     sys_sync
 254         PTR     sys_kill
 255         PTR     sys_rename
 256         PTR     sys_mkdir
 257         PTR     sys_rmdir                       /* 4040 */
 258         PTR     sys_dup
 259         PTR     sysm_pipe
 260         PTR     sys_times
 261         PTR     sys_ni_syscall
 262         PTR     sys_brk                         /* 4045 */
 263         PTR     sys_setgid
 264         PTR     sys_getgid
 265         PTR     sys_ni_syscall                  /* was signal(2) */
 266         PTR     sys_geteuid
 267         PTR     sys_getegid                     /* 4050 */
 268         PTR     sys_acct
 269         PTR     sys_umount
 270         PTR     sys_ni_syscall
 271         PTR     sys_ioctl
 272         PTR     sys_fcntl                       /* 4055 */
 273         PTR     sys_ni_syscall
 274         PTR     sys_setpgid
 275         PTR     sys_ni_syscall
 276         PTR     sys_olduname
 277         PTR     sys_umask                       /* 4060 */
 278         PTR     sys_chroot
 279         PTR     sys_ustat
 280         PTR     sys_dup2
 281         PTR     sys_getppid
 282         PTR     sys_getpgrp                     /* 4065 */
 283         PTR     sys_setsid
 284         PTR     sys_sigaction
 285         PTR     sys_sgetmask
 286         PTR     sys_ssetmask
 287         PTR     sys_setreuid                    /* 4070 */
 288         PTR     sys_setregid
 289         PTR     sys_sigsuspend
 290         PTR     sys_sigpending
 291         PTR     sys_sethostname
 292         PTR     sys_setrlimit                   /* 4075 */
 293         PTR     sys_getrlimit
 294         PTR     sys_getrusage
 295         PTR     sys_gettimeofday
 296         PTR     sys_settimeofday
 297         PTR     sys_getgroups                   /* 4080 */
 298         PTR     sys_setgroups
 299         PTR     sys_ni_syscall                  /* old_select */
 300         PTR     sys_symlink
 301         PTR     sys_ni_syscall                  /* was sys_lstat */
 302         PTR     sys_readlink                    /* 4085 */
 303         PTR     sys_uselib
 304         PTR     sys_swapon
 305         PTR     sys_reboot
 306         PTR     sys_old_readdir
 307         PTR     sys_mips_mmap                   /* 4090 */
 308         PTR     sys_munmap
 309         PTR     sys_truncate
 310         PTR     sys_ftruncate
 311         PTR     sys_fchmod
 312         PTR     sys_fchown                      /* 4095 */
 313         PTR     sys_getpriority
 314         PTR     sys_setpriority
 315         PTR     sys_ni_syscall
 316         PTR     sys_statfs
 317         PTR     sys_fstatfs                     /* 4100 */
 318         PTR     sys_ni_syscall                  /* was ioperm(2) */
 319         PTR     sys_socketcall
 320         PTR     sys_syslog
 321         PTR     sys_setitimer
 322         PTR     sys_getitimer                   /* 4105 */
 323         PTR     sys_newstat
 324         PTR     sys_newlstat
 325         PTR     sys_newfstat
 326         PTR     sys_uname
 327         PTR     sys_ni_syscall                  /* 4110 was iopl(2) */
 328         PTR     sys_vhangup
 329         PTR     sys_ni_syscall                  /* was sys_idle() */
 330         PTR     sys_ni_syscall                  /* was sys_vm86 */
 331         PTR     sys_wait4
 332         PTR     sys_swapoff                     /* 4115 */
 333         PTR     sys_sysinfo
 334         PTR     sys_ipc
 335         PTR     sys_fsync
 336         PTR     sys_sigreturn
 337         PTR     __sys_clone                     /* 4120 */
 338         PTR     sys_setdomainname
 339         PTR     sys_newuname
 340         PTR     sys_ni_syscall                  /* sys_modify_ldt */
 341         PTR     sys_adjtimex
 342         PTR     sys_mprotect                    /* 4125 */
 343         PTR     sys_sigprocmask
 344         PTR     sys_ni_syscall                  /* was create_module */
 345         PTR     sys_init_module
 346         PTR     sys_delete_module
 347         PTR     sys_ni_syscall                  /* 4130 was get_kernel_syms */
 348         PTR     sys_quotactl
 349         PTR     sys_getpgid
 350         PTR     sys_fchdir
 351         PTR     sys_bdflush
 352         PTR     sys_sysfs                       /* 4135 */
 353         PTR     sys_personality
 354         PTR     sys_ni_syscall                  /* for afs_syscall */
 355         PTR     sys_setfsuid
 356         PTR     sys_setfsgid
 357         PTR     sys_llseek                      /* 4140 */
 358         PTR     sys_getdents
 359         PTR     sys_select
 360         PTR     sys_flock
 361         PTR     sys_msync
 362         PTR     sys_readv                       /* 4145 */
 363         PTR     sys_writev
 364         PTR     sys_cacheflush
 365         PTR     sys_cachectl
 366         PTR     sys_sysmips
 367         PTR     sys_ni_syscall                  /* 4150 */
 368         PTR     sys_getsid
 369         PTR     sys_fdatasync
 370         PTR     sys_sysctl
 371         PTR     sys_mlock
 372         PTR     sys_munlock                     /* 4155 */
 373         PTR     sys_mlockall
 374         PTR     sys_munlockall
 375         PTR     sys_sched_setparam
 376         PTR     sys_sched_getparam
 377         PTR     sys_sched_setscheduler          /* 4160 */
 378         PTR     sys_sched_getscheduler
 379         PTR     sys_sched_yield
 380         PTR     sys_sched_get_priority_max
 381         PTR     sys_sched_get_priority_min
 382         PTR     sys_sched_rr_get_interval       /* 4165 */
 383         PTR     sys_nanosleep
 384         PTR     sys_mremap
 385         PTR     sys_accept
 386         PTR     sys_bind
 387         PTR     sys_connect                     /* 4170 */
 388         PTR     sys_getpeername
 389         PTR     sys_getsockname
 390         PTR     sys_getsockopt
 391         PTR     sys_listen
 392         PTR     sys_recv                        /* 4175 */
 393         PTR     sys_recvfrom
 394         PTR     sys_recvmsg
 395         PTR     sys_send
 396         PTR     sys_sendmsg
 397         PTR     sys_sendto                      /* 4180 */
 398         PTR     sys_setsockopt
 399         PTR     sys_shutdown
 400         PTR     sys_socket
 401         PTR     sys_socketpair
 402         PTR     sys_setresuid                   /* 4185 */
 403         PTR     sys_getresuid
 404         PTR     sys_ni_syscall                  /* was sys_query_module */
 405         PTR     sys_poll
 406         PTR     sys_ni_syscall                  /* was nfsservctl */
 407         PTR     sys_setresgid                   /* 4190 */
 408         PTR     sys_getresgid
 409         PTR     sys_prctl
 410         PTR     sys_rt_sigreturn
 411         PTR     sys_rt_sigaction
 412         PTR     sys_rt_sigprocmask              /* 4195 */
 413         PTR     sys_rt_sigpending
 414         PTR     sys_rt_sigtimedwait
 415         PTR     sys_rt_sigqueueinfo
 416         PTR     sys_rt_sigsuspend
 417         PTR     sys_pread64                     /* 4200 */
 418         PTR     sys_pwrite64
 419         PTR     sys_chown
 420         PTR     sys_getcwd
 421         PTR     sys_capget
 422         PTR     sys_capset                      /* 4205 */
 423         PTR     sys_sigaltstack
 424         PTR     sys_sendfile
 425         PTR     sys_ni_syscall
 426         PTR     sys_ni_syscall
 427         PTR     sys_mips_mmap2                  /* 4210 */
 428         PTR     sys_truncate64
 429         PTR     sys_ftruncate64
 430         PTR     sys_stat64
 431         PTR     sys_lstat64
 432         PTR     sys_fstat64                     /* 4215 */
 433         PTR     sys_pivot_root
 434         PTR     sys_mincore
 435         PTR     sys_madvise
 436         PTR     sys_getdents64
 437         PTR     sys_fcntl64                     /* 4220 */
 438         PTR     sys_ni_syscall
 439         PTR     sys_gettid
 440         PTR     sys_readahead
 441         PTR     sys_setxattr
 442         PTR     sys_lsetxattr                   /* 4225 */
 443         PTR     sys_fsetxattr
 444         PTR     sys_getxattr
 445         PTR     sys_lgetxattr
 446         PTR     sys_fgetxattr
 447         PTR     sys_listxattr                   /* 4230 */
 448         PTR     sys_llistxattr
 449         PTR     sys_flistxattr
 450         PTR     sys_removexattr
 451         PTR     sys_lremovexattr
 452         PTR     sys_fremovexattr                /* 4235 */
 453         PTR     sys_tkill
 454         PTR     sys_sendfile64
 455         PTR     sys_futex
 456 #ifdef CONFIG_MIPS_MT_FPAFF
 457         /*
 458          * For FPU affinity scheduling on MIPS MT processors, we need to
 459          * intercept sys_sched_xxxaffinity() calls until we get a proper hook
 460          * in kernel/sched/core.c.  Considered only temporary we only support
 461          * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
 462          * atm.
 463          */
 464         PTR     mipsmt_sys_sched_setaffinity
 465         PTR     mipsmt_sys_sched_getaffinity
 466 #else
 467         PTR     sys_sched_setaffinity
 468         PTR     sys_sched_getaffinity           /* 4240 */
 469 #endif /* CONFIG_MIPS_MT_FPAFF */
 470         PTR     sys_io_setup
 471         PTR     sys_io_destroy
 472         PTR     sys_io_getevents
 473         PTR     sys_io_submit
 474         PTR     sys_io_cancel                   /* 4245 */
 475         PTR     sys_exit_group
 476         PTR     sys_lookup_dcookie
 477         PTR     sys_epoll_create
 478         PTR     sys_epoll_ctl
 479         PTR     sys_epoll_wait                  /* 4250 */
 480         PTR     sys_remap_file_pages
 481         PTR     sys_set_tid_address
 482         PTR     sys_restart_syscall
 483         PTR     sys_fadvise64_64
 484         PTR     sys_statfs64                    /* 4255 */
 485         PTR     sys_fstatfs64
 486         PTR     sys_timer_create
 487         PTR     sys_timer_settime
 488         PTR     sys_timer_gettime
 489         PTR     sys_timer_getoverrun            /* 4260 */
 490         PTR     sys_timer_delete
 491         PTR     sys_clock_settime
 492         PTR     sys_clock_gettime
 493         PTR     sys_clock_getres
 494         PTR     sys_clock_nanosleep             /* 4265 */
 495         PTR     sys_tgkill
 496         PTR     sys_utimes
 497         PTR     sys_mbind
 498         PTR     sys_ni_syscall                  /* sys_get_mempolicy */
 499         PTR     sys_ni_syscall                  /* 4270 sys_set_mempolicy */
 500         PTR     sys_mq_open
 501         PTR     sys_mq_unlink
 502         PTR     sys_mq_timedsend
 503         PTR     sys_mq_timedreceive
 504         PTR     sys_mq_notify                   /* 4275 */
 505         PTR     sys_mq_getsetattr
 506         PTR     sys_ni_syscall                  /* sys_vserver */
 507         PTR     sys_waitid
 508         PTR     sys_ni_syscall                  /* available, was setaltroot */
 509         PTR     sys_add_key                     /* 4280 */
 510         PTR     sys_request_key
 511         PTR     sys_keyctl
 512         PTR     sys_set_thread_area
 513         PTR     sys_inotify_init
 514         PTR     sys_inotify_add_watch           /* 4285 */
 515         PTR     sys_inotify_rm_watch
 516         PTR     sys_migrate_pages
 517         PTR     sys_openat
 518         PTR     sys_mkdirat
 519         PTR     sys_mknodat                     /* 4290 */
 520         PTR     sys_fchownat
 521         PTR     sys_futimesat
 522         PTR     sys_fstatat64
 523         PTR     sys_unlinkat
 524         PTR     sys_renameat                    /* 4295 */
 525         PTR     sys_linkat
 526         PTR     sys_symlinkat
 527         PTR     sys_readlinkat
 528         PTR     sys_fchmodat
 529         PTR     sys_faccessat                   /* 4300 */
 530         PTR     sys_pselect6
 531         PTR     sys_ppoll
 532         PTR     sys_unshare
 533         PTR     sys_splice
 534         PTR     sys_sync_file_range             /* 4305 */
 535         PTR     sys_tee
 536         PTR     sys_vmsplice
 537         PTR     sys_move_pages
 538         PTR     sys_set_robust_list
 539         PTR     sys_get_robust_list             /* 4310 */
 540         PTR     sys_kexec_load
 541         PTR     sys_getcpu
 542         PTR     sys_epoll_pwait
 543         PTR     sys_ioprio_set
 544         PTR     sys_ioprio_get                  /* 4315 */
 545         PTR     sys_utimensat
 546         PTR     sys_signalfd
 547         PTR     sys_ni_syscall                  /* was timerfd */
 548         PTR     sys_eventfd
 549         PTR     sys_fallocate                   /* 4320 */
 550         PTR     sys_timerfd_create
 551         PTR     sys_timerfd_gettime
 552         PTR     sys_timerfd_settime
 553         PTR     sys_signalfd4
 554         PTR     sys_eventfd2                    /* 4325 */
 555         PTR     sys_epoll_create1
 556         PTR     sys_dup3
 557         PTR     sys_pipe2
 558         PTR     sys_inotify_init1
 559         PTR     sys_preadv                      /* 4330 */
 560         PTR     sys_pwritev
 561         PTR     sys_rt_tgsigqueueinfo
 562         PTR     sys_perf_event_open
 563         PTR     sys_accept4
 564         PTR     sys_recvmmsg                    /* 4335 */
 565         PTR     sys_fanotify_init
 566         PTR     sys_fanotify_mark
 567         PTR     sys_prlimit64
 568         PTR     sys_name_to_handle_at
 569         PTR     sys_open_by_handle_at           /* 4340 */
 570         PTR     sys_clock_adjtime
 571         PTR     sys_syncfs
 572         PTR     sys_sendmmsg
 573         PTR     sys_setns
 574         PTR     sys_process_vm_readv            /* 4345 */
 575         PTR     sys_process_vm_writev
 576         PTR     sys_kcmp
 577         PTR     sys_finit_module
 578         PTR     sys_sched_setattr
 579         PTR     sys_sched_getattr               /* 4350 */