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 29NESTED(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 */ 71 72 .set push 73 .set noreorder 74 .set nomacro 75 761: user_lw(t5, 16(t0)) # argument #5 from usp 774: user_lw(t6, 20(t0)) # argument #6 from usp 783: user_lw(t7, 24(t0)) # argument #7 from usp 792: user_lw(t8, 28(t0)) # argument #8 from usp 80 81 sw t5, 16(sp) # argument #5 to ksp 82 sw t6, 20(sp) # argument #6 to ksp 83 sw t7, 24(sp) # argument #7 to ksp 84 sw t8, 28(sp) # argument #8 to ksp 85 .set pop 86 87 .section __ex_table,"a" 88 PTR 1b,bad_stack 89 PTR 2b,bad_stack 90 PTR 3b,bad_stack 91 PTR 4b,bad_stack 92 .previous 93 94 lw t0, TI_FLAGS($28) # syscall tracing enabled? 95 li t1, _TIF_WORK_SYSCALL_ENTRY 96 and t0, t1 97 bnez t0, syscall_trace_entry # -> yes 98 99 jalr t2 # Do The Real Thing (TM) 100 101 li t0, -EMAXERRNO - 1 # error? 102 sltu t0, t0, v0 103 sw t0, PT_R7(sp) # set error flag 104 beqz t0, 1f 105 106 lw t1, PT_R2(sp) # syscall number 107 negu v0 # error 108 sw t1, PT_R0(sp) # save it for syscall restarting 1091: sw v0, PT_R2(sp) # result 110 111o32_syscall_exit: 112 j syscall_exit_partial 113 114/* ------------------------------------------------------------------------ */ 115 116syscall_trace_entry: 117 SAVE_STATIC 118 move s0, t2 119 move a0, sp 120 121 /* 122 * syscall number is in v0 unless we called syscall(__NR_###) 123 * where the real syscall number is in a0 124 */ 125 addiu a1, v0, __NR_O32_Linux 126 bnez v0, 1f /* __NR_syscall at offset 0 */ 127 lw a1, PT_R4(sp) 128 1291: jal syscall_trace_enter 130 131 bltz v0, 2f # seccomp failed? Skip syscall 132 133 move t0, s0 134 RESTORE_STATIC 135 lw a0, PT_R4(sp) # Restore argument registers 136 lw a1, PT_R5(sp) 137 lw a2, PT_R6(sp) 138 lw a3, PT_R7(sp) 139 jalr t0 140 141 li t0, -EMAXERRNO - 1 # error? 142 sltu t0, t0, v0 143 sw t0, PT_R7(sp) # set error flag 144 beqz t0, 1f 145 146 lw t1, PT_R2(sp) # syscall number 147 negu v0 # error 148 sw t1, PT_R0(sp) # save it for syscall restarting 1491: sw v0, PT_R2(sp) # result 150 1512: j syscall_exit 152 153/* ------------------------------------------------------------------------ */ 154 155 /* 156 * The stackpointer for a call with more than 4 arguments is bad. 157 * We probably should handle this case a bit more drastic. 158 */ 159bad_stack: 160 li v0, EFAULT 161 sw v0, PT_R2(sp) 162 li t0, 1 # set error flag 163 sw t0, PT_R7(sp) 164 j o32_syscall_exit 165 166 /* 167 * The system call does not exist in this kernel 168 */ 169illegal_syscall: 170 li v0, ENOSYS # error 171 sw v0, PT_R2(sp) 172 li t0, 1 # set error flag 173 sw t0, PT_R7(sp) 174 j o32_syscall_exit 175 END(handle_sys) 176 177 LEAF(sys_syscall) 178 subu t0, a0, __NR_O32_Linux # check syscall number 179 sltiu v0, t0, __NR_O32_Linux_syscalls + 1 180 beqz t0, einval # do not recurse 181 sll t1, t0, 2 182 beqz v0, einval 183 lw t2, sys_call_table(t1) # syscall routine 184 185 /* Some syscalls like execve get their arguments from struct pt_regs 186 and claim zero arguments in the syscall table. Thus we have to 187 assume the worst case and shuffle around all potential arguments. 188 If you want performance, don't use indirect syscalls. */ 189 190 move a0, a1 # shift argument registers 191 move a1, a2 192 move a2, a3 193 lw a3, 16(sp) 194 lw t4, 20(sp) 195 lw t5, 24(sp) 196 lw t6, 28(sp) 197 sw t4, 16(sp) 198 sw t5, 20(sp) 199 sw t6, 24(sp) 200 sw a0, PT_R4(sp) # .. and push back a0 - a3, some 201 sw a1, PT_R5(sp) # syscalls expect them there 202 sw a2, PT_R6(sp) 203 sw a3, PT_R7(sp) 204 sw a3, PT_R26(sp) # update a3 for syscall restarting 205 jr t2 206 /* Unreached */ 207 208einval: li v0, -ENOSYS 209 jr ra 210 END(sys_syscall) 211 212 .align 2 213 .type sys_call_table, @object 214EXPORT(sys_call_table) 215 PTR sys_syscall /* 4000 */ 216 PTR sys_exit 217 PTR __sys_fork 218 PTR sys_read 219 PTR sys_write 220 PTR sys_open /* 4005 */ 221 PTR sys_close 222 PTR sys_waitpid 223 PTR sys_creat 224 PTR sys_link 225 PTR sys_unlink /* 4010 */ 226 PTR sys_execve 227 PTR sys_chdir 228 PTR sys_time 229 PTR sys_mknod 230 PTR sys_chmod /* 4015 */ 231 PTR sys_lchown 232 PTR sys_ni_syscall 233 PTR sys_ni_syscall /* was sys_stat */ 234 PTR sys_lseek 235 PTR sys_getpid /* 4020 */ 236 PTR sys_mount 237 PTR sys_oldumount 238 PTR sys_setuid 239 PTR sys_getuid 240 PTR sys_stime /* 4025 */ 241 PTR sys_ptrace 242 PTR sys_alarm 243 PTR sys_ni_syscall /* was sys_fstat */ 244 PTR sys_pause 245 PTR sys_utime /* 4030 */ 246 PTR sys_ni_syscall 247 PTR sys_ni_syscall 248 PTR sys_access 249 PTR sys_nice 250 PTR sys_ni_syscall /* 4035 */ 251 PTR sys_sync 252 PTR sys_kill 253 PTR sys_rename 254 PTR sys_mkdir 255 PTR sys_rmdir /* 4040 */ 256 PTR sys_dup 257 PTR sysm_pipe 258 PTR sys_times 259 PTR sys_ni_syscall 260 PTR sys_brk /* 4045 */ 261 PTR sys_setgid 262 PTR sys_getgid 263 PTR sys_ni_syscall /* was signal(2) */ 264 PTR sys_geteuid 265 PTR sys_getegid /* 4050 */ 266 PTR sys_acct 267 PTR sys_umount 268 PTR sys_ni_syscall 269 PTR sys_ioctl 270 PTR sys_fcntl /* 4055 */ 271 PTR sys_ni_syscall 272 PTR sys_setpgid 273 PTR sys_ni_syscall 274 PTR sys_olduname 275 PTR sys_umask /* 4060 */ 276 PTR sys_chroot 277 PTR sys_ustat 278 PTR sys_dup2 279 PTR sys_getppid 280 PTR sys_getpgrp /* 4065 */ 281 PTR sys_setsid 282 PTR sys_sigaction 283 PTR sys_sgetmask 284 PTR sys_ssetmask 285 PTR sys_setreuid /* 4070 */ 286 PTR sys_setregid 287 PTR sys_sigsuspend 288 PTR sys_sigpending 289 PTR sys_sethostname 290 PTR sys_setrlimit /* 4075 */ 291 PTR sys_getrlimit 292 PTR sys_getrusage 293 PTR sys_gettimeofday 294 PTR sys_settimeofday 295 PTR sys_getgroups /* 4080 */ 296 PTR sys_setgroups 297 PTR sys_ni_syscall /* old_select */ 298 PTR sys_symlink 299 PTR sys_ni_syscall /* was sys_lstat */ 300 PTR sys_readlink /* 4085 */ 301 PTR sys_uselib 302 PTR sys_swapon 303 PTR sys_reboot 304 PTR sys_old_readdir 305 PTR sys_mips_mmap /* 4090 */ 306 PTR sys_munmap 307 PTR sys_truncate 308 PTR sys_ftruncate 309 PTR sys_fchmod 310 PTR sys_fchown /* 4095 */ 311 PTR sys_getpriority 312 PTR sys_setpriority 313 PTR sys_ni_syscall 314 PTR sys_statfs 315 PTR sys_fstatfs /* 4100 */ 316 PTR sys_ni_syscall /* was ioperm(2) */ 317 PTR sys_socketcall 318 PTR sys_syslog 319 PTR sys_setitimer 320 PTR sys_getitimer /* 4105 */ 321 PTR sys_newstat 322 PTR sys_newlstat 323 PTR sys_newfstat 324 PTR sys_uname 325 PTR sys_ni_syscall /* 4110 was iopl(2) */ 326 PTR sys_vhangup 327 PTR sys_ni_syscall /* was sys_idle() */ 328 PTR sys_ni_syscall /* was sys_vm86 */ 329 PTR sys_wait4 330 PTR sys_swapoff /* 4115 */ 331 PTR sys_sysinfo 332 PTR sys_ipc 333 PTR sys_fsync 334 PTR sys_sigreturn 335 PTR __sys_clone /* 4120 */ 336 PTR sys_setdomainname 337 PTR sys_newuname 338 PTR sys_ni_syscall /* sys_modify_ldt */ 339 PTR sys_adjtimex 340 PTR sys_mprotect /* 4125 */ 341 PTR sys_sigprocmask 342 PTR sys_ni_syscall /* was create_module */ 343 PTR sys_init_module 344 PTR sys_delete_module 345 PTR sys_ni_syscall /* 4130 was get_kernel_syms */ 346 PTR sys_quotactl 347 PTR sys_getpgid 348 PTR sys_fchdir 349 PTR sys_bdflush 350 PTR sys_sysfs /* 4135 */ 351 PTR sys_personality 352 PTR sys_ni_syscall /* for afs_syscall */ 353 PTR sys_setfsuid 354 PTR sys_setfsgid 355 PTR sys_llseek /* 4140 */ 356 PTR sys_getdents 357 PTR sys_select 358 PTR sys_flock 359 PTR sys_msync 360 PTR sys_readv /* 4145 */ 361 PTR sys_writev 362 PTR sys_cacheflush 363 PTR sys_cachectl 364 PTR sys_sysmips 365 PTR sys_ni_syscall /* 4150 */ 366 PTR sys_getsid 367 PTR sys_fdatasync 368 PTR sys_sysctl 369 PTR sys_mlock 370 PTR sys_munlock /* 4155 */ 371 PTR sys_mlockall 372 PTR sys_munlockall 373 PTR sys_sched_setparam 374 PTR sys_sched_getparam 375 PTR sys_sched_setscheduler /* 4160 */ 376 PTR sys_sched_getscheduler 377 PTR sys_sched_yield 378 PTR sys_sched_get_priority_max 379 PTR sys_sched_get_priority_min 380 PTR sys_sched_rr_get_interval /* 4165 */ 381 PTR sys_nanosleep 382 PTR sys_mremap 383 PTR sys_accept 384 PTR sys_bind 385 PTR sys_connect /* 4170 */ 386 PTR sys_getpeername 387 PTR sys_getsockname 388 PTR sys_getsockopt 389 PTR sys_listen 390 PTR sys_recv /* 4175 */ 391 PTR sys_recvfrom 392 PTR sys_recvmsg 393 PTR sys_send 394 PTR sys_sendmsg 395 PTR sys_sendto /* 4180 */ 396 PTR sys_setsockopt 397 PTR sys_shutdown 398 PTR sys_socket 399 PTR sys_socketpair 400 PTR sys_setresuid /* 4185 */ 401 PTR sys_getresuid 402 PTR sys_ni_syscall /* was sys_query_module */ 403 PTR sys_poll 404 PTR sys_ni_syscall /* was nfsservctl */ 405 PTR sys_setresgid /* 4190 */ 406 PTR sys_getresgid 407 PTR sys_prctl 408 PTR sys_rt_sigreturn 409 PTR sys_rt_sigaction 410 PTR sys_rt_sigprocmask /* 4195 */ 411 PTR sys_rt_sigpending 412 PTR sys_rt_sigtimedwait 413 PTR sys_rt_sigqueueinfo 414 PTR sys_rt_sigsuspend 415 PTR sys_pread64 /* 4200 */ 416 PTR sys_pwrite64 417 PTR sys_chown 418 PTR sys_getcwd 419 PTR sys_capget 420 PTR sys_capset /* 4205 */ 421 PTR sys_sigaltstack 422 PTR sys_sendfile 423 PTR sys_ni_syscall 424 PTR sys_ni_syscall 425 PTR sys_mips_mmap2 /* 4210 */ 426 PTR sys_truncate64 427 PTR sys_ftruncate64 428 PTR sys_stat64 429 PTR sys_lstat64 430 PTR sys_fstat64 /* 4215 */ 431 PTR sys_pivot_root 432 PTR sys_mincore 433 PTR sys_madvise 434 PTR sys_getdents64 435 PTR sys_fcntl64 /* 4220 */ 436 PTR sys_ni_syscall 437 PTR sys_gettid 438 PTR sys_readahead 439 PTR sys_setxattr 440 PTR sys_lsetxattr /* 4225 */ 441 PTR sys_fsetxattr 442 PTR sys_getxattr 443 PTR sys_lgetxattr 444 PTR sys_fgetxattr 445 PTR sys_listxattr /* 4230 */ 446 PTR sys_llistxattr 447 PTR sys_flistxattr 448 PTR sys_removexattr 449 PTR sys_lremovexattr 450 PTR sys_fremovexattr /* 4235 */ 451 PTR sys_tkill 452 PTR sys_sendfile64 453 PTR sys_futex 454#ifdef CONFIG_MIPS_MT_FPAFF 455 /* 456 * For FPU affinity scheduling on MIPS MT processors, we need to 457 * intercept sys_sched_xxxaffinity() calls until we get a proper hook 458 * in kernel/sched/core.c. Considered only temporary we only support 459 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor 460 * atm. 461 */ 462 PTR mipsmt_sys_sched_setaffinity 463 PTR mipsmt_sys_sched_getaffinity 464#else 465 PTR sys_sched_setaffinity 466 PTR sys_sched_getaffinity /* 4240 */ 467#endif /* CONFIG_MIPS_MT_FPAFF */ 468 PTR sys_io_setup 469 PTR sys_io_destroy 470 PTR sys_io_getevents 471 PTR sys_io_submit 472 PTR sys_io_cancel /* 4245 */ 473 PTR sys_exit_group 474 PTR sys_lookup_dcookie 475 PTR sys_epoll_create 476 PTR sys_epoll_ctl 477 PTR sys_epoll_wait /* 4250 */ 478 PTR sys_remap_file_pages 479 PTR sys_set_tid_address 480 PTR sys_restart_syscall 481 PTR sys_fadvise64_64 482 PTR sys_statfs64 /* 4255 */ 483 PTR sys_fstatfs64 484 PTR sys_timer_create 485 PTR sys_timer_settime 486 PTR sys_timer_gettime 487 PTR sys_timer_getoverrun /* 4260 */ 488 PTR sys_timer_delete 489 PTR sys_clock_settime 490 PTR sys_clock_gettime 491 PTR sys_clock_getres 492 PTR sys_clock_nanosleep /* 4265 */ 493 PTR sys_tgkill 494 PTR sys_utimes 495 PTR sys_mbind 496 PTR sys_get_mempolicy 497 PTR sys_set_mempolicy /* 4270 */ 498 PTR sys_mq_open 499 PTR sys_mq_unlink 500 PTR sys_mq_timedsend 501 PTR sys_mq_timedreceive 502 PTR sys_mq_notify /* 4275 */ 503 PTR sys_mq_getsetattr 504 PTR sys_ni_syscall /* sys_vserver */ 505 PTR sys_waitid 506 PTR sys_ni_syscall /* available, was setaltroot */ 507 PTR sys_add_key /* 4280 */ 508 PTR sys_request_key 509 PTR sys_keyctl 510 PTR sys_set_thread_area 511 PTR sys_inotify_init 512 PTR sys_inotify_add_watch /* 4285 */ 513 PTR sys_inotify_rm_watch 514 PTR sys_migrate_pages 515 PTR sys_openat 516 PTR sys_mkdirat 517 PTR sys_mknodat /* 4290 */ 518 PTR sys_fchownat 519 PTR sys_futimesat 520 PTR sys_fstatat64 521 PTR sys_unlinkat 522 PTR sys_renameat /* 4295 */ 523 PTR sys_linkat 524 PTR sys_symlinkat 525 PTR sys_readlinkat 526 PTR sys_fchmodat 527 PTR sys_faccessat /* 4300 */ 528 PTR sys_pselect6 529 PTR sys_ppoll 530 PTR sys_unshare 531 PTR sys_splice 532 PTR sys_sync_file_range /* 4305 */ 533 PTR sys_tee 534 PTR sys_vmsplice 535 PTR sys_move_pages 536 PTR sys_set_robust_list 537 PTR sys_get_robust_list /* 4310 */ 538 PTR sys_kexec_load 539 PTR sys_getcpu 540 PTR sys_epoll_pwait 541 PTR sys_ioprio_set 542 PTR sys_ioprio_get /* 4315 */ 543 PTR sys_utimensat 544 PTR sys_signalfd 545 PTR sys_ni_syscall /* was timerfd */ 546 PTR sys_eventfd 547 PTR sys_fallocate /* 4320 */ 548 PTR sys_timerfd_create 549 PTR sys_timerfd_gettime 550 PTR sys_timerfd_settime 551 PTR sys_signalfd4 552 PTR sys_eventfd2 /* 4325 */ 553 PTR sys_epoll_create1 554 PTR sys_dup3 555 PTR sys_pipe2 556 PTR sys_inotify_init1 557 PTR sys_preadv /* 4330 */ 558 PTR sys_pwritev 559 PTR sys_rt_tgsigqueueinfo 560 PTR sys_perf_event_open 561 PTR sys_accept4 562 PTR sys_recvmmsg /* 4335 */ 563 PTR sys_fanotify_init 564 PTR sys_fanotify_mark 565 PTR sys_prlimit64 566 PTR sys_name_to_handle_at 567 PTR sys_open_by_handle_at /* 4340 */ 568 PTR sys_clock_adjtime 569 PTR sys_syncfs 570 PTR sys_sendmmsg 571 PTR sys_setns 572 PTR sys_process_vm_readv /* 4345 */ 573 PTR sys_process_vm_writev 574 PTR sys_kcmp 575 PTR sys_finit_module 576 PTR sys_sched_setattr 577 PTR sys_sched_getattr /* 4350 */ 578 PTR sys_renameat2 579 PTR sys_seccomp 580 PTR sys_getrandom 581 PTR sys_memfd_create 582 PTR sys_bpf /* 4355 */ 583