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 addiu t1, 4 # skip to next instruction 39 sw t1, PT_EPC(sp) 40 41 sw a3, PT_R26(sp) # save a3 for syscall restarting 42 43 /* 44 * More than four arguments. Try to deal with it by copying the 45 * stack arguments from the user stack to the kernel stack. 46 * This Sucks (TM). 47 */ 48 lw t0, PT_R29(sp) # get old user stack pointer 49 50 /* 51 * We intentionally keep the kernel stack a little below the top of 52 * userspace so we don't have to do a slower byte accurate check here. 53 */ 54 lw t5, TI_ADDR_LIMIT($28) 55 addu t4, t0, 32 56 and t5, t4 57 bltz t5, bad_stack # -> sp is bad 58 59 /* 60 * Ok, copy the args from the luser stack to the kernel stack. 61 */ 62 63 .set push 64 .set noreorder 65 .set nomacro 66 67load_a4: user_lw(t5, 16(t0)) # argument #5 from usp 68load_a5: user_lw(t6, 20(t0)) # argument #6 from usp 69load_a6: user_lw(t7, 24(t0)) # argument #7 from usp 70load_a7: user_lw(t8, 28(t0)) # argument #8 from usp 71loads_done: 72 73 sw t5, 16(sp) # argument #5 to ksp 74 sw t6, 20(sp) # argument #6 to ksp 75 sw t7, 24(sp) # argument #7 to ksp 76 sw t8, 28(sp) # argument #8 to ksp 77 .set pop 78 79 .section __ex_table,"a" 80 PTR load_a4, bad_stack_a4 81 PTR load_a5, bad_stack_a5 82 PTR load_a6, bad_stack_a6 83 PTR load_a7, bad_stack_a7 84 .previous 85 86 lw t0, TI_FLAGS($28) # syscall tracing enabled? 87 li t1, _TIF_WORK_SYSCALL_ENTRY 88 and t0, t1 89 bnez t0, syscall_trace_entry # -> yes 90syscall_common: 91 subu v0, v0, __NR_O32_Linux # check syscall number 92 sltiu t0, v0, __NR_O32_Linux_syscalls + 1 93 beqz t0, illegal_syscall 94 95 sll t0, v0, 2 96 la t1, sys_call_table 97 addu t1, t0 98 lw t2, (t1) # syscall routine 99 100 beqz t2, illegal_syscall 101 102 jalr t2 # Do The Real Thing (TM) 103 104 li t0, -EMAXERRNO - 1 # error? 105 sltu t0, t0, v0 106 sw t0, PT_R7(sp) # set error flag 107 beqz t0, 1f 108 109 lw t1, PT_R2(sp) # syscall number 110 negu v0 # error 111 sw t1, PT_R0(sp) # save it for syscall restarting 1121: sw v0, PT_R2(sp) # result 113 114o32_syscall_exit: 115 j syscall_exit_partial 116 117/* ------------------------------------------------------------------------ */ 118 119syscall_trace_entry: 120 SAVE_STATIC 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 move a1, v0 128 subu t2, v0, __NR_O32_Linux 129 bnez t2, 1f /* __NR_syscall at offset 0 */ 130 lw a1, PT_R4(sp) 131 1321: jal syscall_trace_enter 133 134 bltz v0, 1f # seccomp failed? Skip syscall 135 136 RESTORE_STATIC 137 lw v0, PT_R2(sp) # Restore syscall (maybe modified) 138 lw a0, PT_R4(sp) # Restore argument registers 139 lw a1, PT_R5(sp) 140 lw a2, PT_R6(sp) 141 lw a3, PT_R7(sp) 142 j syscall_common 143 1441: j syscall_exit 145 146/* ------------------------------------------------------------------------ */ 147 148 /* 149 * Our open-coded access area sanity test for the stack pointer 150 * failed. We probably should handle this case a bit more drastic. 151 */ 152bad_stack: 153 li v0, EFAULT 154 sw v0, PT_R2(sp) 155 li t0, 1 # set error flag 156 sw t0, PT_R7(sp) 157 j o32_syscall_exit 158 159bad_stack_a4: 160 li t5, 0 161 b load_a5 162 163bad_stack_a5: 164 li t6, 0 165 b load_a6 166 167bad_stack_a6: 168 li t7, 0 169 b load_a7 170 171bad_stack_a7: 172 li t8, 0 173 b loads_done 174 175 /* 176 * The system call does not exist in this kernel 177 */ 178illegal_syscall: 179 li v0, ENOSYS # error 180 sw v0, PT_R2(sp) 181 li t0, 1 # set error flag 182 sw t0, PT_R7(sp) 183 j o32_syscall_exit 184 END(handle_sys) 185 186 LEAF(sys_syscall) 187 subu t0, a0, __NR_O32_Linux # check syscall number 188 sltiu v0, t0, __NR_O32_Linux_syscalls + 1 189 beqz t0, einval # do not recurse 190 sll t1, t0, 2 191 beqz v0, einval 192 lw t2, sys_call_table(t1) # syscall routine 193 sw a0, PT_R2(sp) # call routine directly on restart 194 195 /* Some syscalls like execve get their arguments from struct pt_regs 196 and claim zero arguments in the syscall table. Thus we have to 197 assume the worst case and shuffle around all potential arguments. 198 If you want performance, don't use indirect syscalls. */ 199 200 move a0, a1 # shift argument registers 201 move a1, a2 202 move a2, a3 203 lw a3, 16(sp) 204 lw t4, 20(sp) 205 lw t5, 24(sp) 206 lw t6, 28(sp) 207 sw t4, 16(sp) 208 sw t5, 20(sp) 209 sw t6, 24(sp) 210 sw a0, PT_R4(sp) # .. and push back a0 - a3, some 211 sw a1, PT_R5(sp) # syscalls expect them there 212 sw a2, PT_R6(sp) 213 sw a3, PT_R7(sp) 214 sw a3, PT_R26(sp) # update a3 for syscall restarting 215 jr t2 216 /* Unreached */ 217 218einval: li v0, -ENOSYS 219 jr ra 220 END(sys_syscall) 221 222 .align 2 223 .type sys_call_table, @object 224EXPORT(sys_call_table) 225 PTR sys_syscall /* 4000 */ 226 PTR sys_exit 227 PTR __sys_fork 228 PTR sys_read 229 PTR sys_write 230 PTR sys_open /* 4005 */ 231 PTR sys_close 232 PTR sys_waitpid 233 PTR sys_creat 234 PTR sys_link 235 PTR sys_unlink /* 4010 */ 236 PTR sys_execve 237 PTR sys_chdir 238 PTR sys_time 239 PTR sys_mknod 240 PTR sys_chmod /* 4015 */ 241 PTR sys_lchown 242 PTR sys_ni_syscall 243 PTR sys_ni_syscall /* was sys_stat */ 244 PTR sys_lseek 245 PTR sys_getpid /* 4020 */ 246 PTR sys_mount 247 PTR sys_oldumount 248 PTR sys_setuid 249 PTR sys_getuid 250 PTR sys_stime /* 4025 */ 251 PTR sys_ptrace 252 PTR sys_alarm 253 PTR sys_ni_syscall /* was sys_fstat */ 254 PTR sys_pause 255 PTR sys_utime /* 4030 */ 256 PTR sys_ni_syscall 257 PTR sys_ni_syscall 258 PTR sys_access 259 PTR sys_nice 260 PTR sys_ni_syscall /* 4035 */ 261 PTR sys_sync 262 PTR sys_kill 263 PTR sys_rename 264 PTR sys_mkdir 265 PTR sys_rmdir /* 4040 */ 266 PTR sys_dup 267 PTR sysm_pipe 268 PTR sys_times 269 PTR sys_ni_syscall 270 PTR sys_brk /* 4045 */ 271 PTR sys_setgid 272 PTR sys_getgid 273 PTR sys_ni_syscall /* was signal(2) */ 274 PTR sys_geteuid 275 PTR sys_getegid /* 4050 */ 276 PTR sys_acct 277 PTR sys_umount 278 PTR sys_ni_syscall 279 PTR sys_ioctl 280 PTR sys_fcntl /* 4055 */ 281 PTR sys_ni_syscall 282 PTR sys_setpgid 283 PTR sys_ni_syscall 284 PTR sys_olduname 285 PTR sys_umask /* 4060 */ 286 PTR sys_chroot 287 PTR sys_ustat 288 PTR sys_dup2 289 PTR sys_getppid 290 PTR sys_getpgrp /* 4065 */ 291 PTR sys_setsid 292 PTR sys_sigaction 293 PTR sys_sgetmask 294 PTR sys_ssetmask 295 PTR sys_setreuid /* 4070 */ 296 PTR sys_setregid 297 PTR sys_sigsuspend 298 PTR sys_sigpending 299 PTR sys_sethostname 300 PTR sys_setrlimit /* 4075 */ 301 PTR sys_getrlimit 302 PTR sys_getrusage 303 PTR sys_gettimeofday 304 PTR sys_settimeofday 305 PTR sys_getgroups /* 4080 */ 306 PTR sys_setgroups 307 PTR sys_ni_syscall /* old_select */ 308 PTR sys_symlink 309 PTR sys_ni_syscall /* was sys_lstat */ 310 PTR sys_readlink /* 4085 */ 311 PTR sys_uselib 312 PTR sys_swapon 313 PTR sys_reboot 314 PTR sys_old_readdir 315 PTR sys_mips_mmap /* 4090 */ 316 PTR sys_munmap 317 PTR sys_truncate 318 PTR sys_ftruncate 319 PTR sys_fchmod 320 PTR sys_fchown /* 4095 */ 321 PTR sys_getpriority 322 PTR sys_setpriority 323 PTR sys_ni_syscall 324 PTR sys_statfs 325 PTR sys_fstatfs /* 4100 */ 326 PTR sys_ni_syscall /* was ioperm(2) */ 327 PTR sys_socketcall 328 PTR sys_syslog 329 PTR sys_setitimer 330 PTR sys_getitimer /* 4105 */ 331 PTR sys_newstat 332 PTR sys_newlstat 333 PTR sys_newfstat 334 PTR sys_uname 335 PTR sys_ni_syscall /* 4110 was iopl(2) */ 336 PTR sys_vhangup 337 PTR sys_ni_syscall /* was sys_idle() */ 338 PTR sys_ni_syscall /* was sys_vm86 */ 339 PTR sys_wait4 340 PTR sys_swapoff /* 4115 */ 341 PTR sys_sysinfo 342 PTR sys_ipc 343 PTR sys_fsync 344 PTR sys_sigreturn 345 PTR __sys_clone /* 4120 */ 346 PTR sys_setdomainname 347 PTR sys_newuname 348 PTR sys_ni_syscall /* sys_modify_ldt */ 349 PTR sys_adjtimex 350 PTR sys_mprotect /* 4125 */ 351 PTR sys_sigprocmask 352 PTR sys_ni_syscall /* was create_module */ 353 PTR sys_init_module 354 PTR sys_delete_module 355 PTR sys_ni_syscall /* 4130 was get_kernel_syms */ 356 PTR sys_quotactl 357 PTR sys_getpgid 358 PTR sys_fchdir 359 PTR sys_bdflush 360 PTR sys_sysfs /* 4135 */ 361 PTR sys_personality 362 PTR sys_ni_syscall /* for afs_syscall */ 363 PTR sys_setfsuid 364 PTR sys_setfsgid 365 PTR sys_llseek /* 4140 */ 366 PTR sys_getdents 367 PTR sys_select 368 PTR sys_flock 369 PTR sys_msync 370 PTR sys_readv /* 4145 */ 371 PTR sys_writev 372 PTR sys_cacheflush 373 PTR sys_cachectl 374 PTR sys_sysmips 375 PTR sys_ni_syscall /* 4150 */ 376 PTR sys_getsid 377 PTR sys_fdatasync 378 PTR sys_sysctl 379 PTR sys_mlock 380 PTR sys_munlock /* 4155 */ 381 PTR sys_mlockall 382 PTR sys_munlockall 383 PTR sys_sched_setparam 384 PTR sys_sched_getparam 385 PTR sys_sched_setscheduler /* 4160 */ 386 PTR sys_sched_getscheduler 387 PTR sys_sched_yield 388 PTR sys_sched_get_priority_max 389 PTR sys_sched_get_priority_min 390 PTR sys_sched_rr_get_interval /* 4165 */ 391 PTR sys_nanosleep 392 PTR sys_mremap 393 PTR sys_accept 394 PTR sys_bind 395 PTR sys_connect /* 4170 */ 396 PTR sys_getpeername 397 PTR sys_getsockname 398 PTR sys_getsockopt 399 PTR sys_listen 400 PTR sys_recv /* 4175 */ 401 PTR sys_recvfrom 402 PTR sys_recvmsg 403 PTR sys_send 404 PTR sys_sendmsg 405 PTR sys_sendto /* 4180 */ 406 PTR sys_setsockopt 407 PTR sys_shutdown 408 PTR sys_socket 409 PTR sys_socketpair 410 PTR sys_setresuid /* 4185 */ 411 PTR sys_getresuid 412 PTR sys_ni_syscall /* was sys_query_module */ 413 PTR sys_poll 414 PTR sys_ni_syscall /* was nfsservctl */ 415 PTR sys_setresgid /* 4190 */ 416 PTR sys_getresgid 417 PTR sys_prctl 418 PTR sys_rt_sigreturn 419 PTR sys_rt_sigaction 420 PTR sys_rt_sigprocmask /* 4195 */ 421 PTR sys_rt_sigpending 422 PTR sys_rt_sigtimedwait 423 PTR sys_rt_sigqueueinfo 424 PTR sys_rt_sigsuspend 425 PTR sys_pread64 /* 4200 */ 426 PTR sys_pwrite64 427 PTR sys_chown 428 PTR sys_getcwd 429 PTR sys_capget 430 PTR sys_capset /* 4205 */ 431 PTR sys_sigaltstack 432 PTR sys_sendfile 433 PTR sys_ni_syscall 434 PTR sys_ni_syscall 435 PTR sys_mips_mmap2 /* 4210 */ 436 PTR sys_truncate64 437 PTR sys_ftruncate64 438 PTR sys_stat64 439 PTR sys_lstat64 440 PTR sys_fstat64 /* 4215 */ 441 PTR sys_pivot_root 442 PTR sys_mincore 443 PTR sys_madvise 444 PTR sys_getdents64 445 PTR sys_fcntl64 /* 4220 */ 446 PTR sys_ni_syscall 447 PTR sys_gettid 448 PTR sys_readahead 449 PTR sys_setxattr 450 PTR sys_lsetxattr /* 4225 */ 451 PTR sys_fsetxattr 452 PTR sys_getxattr 453 PTR sys_lgetxattr 454 PTR sys_fgetxattr 455 PTR sys_listxattr /* 4230 */ 456 PTR sys_llistxattr 457 PTR sys_flistxattr 458 PTR sys_removexattr 459 PTR sys_lremovexattr 460 PTR sys_fremovexattr /* 4235 */ 461 PTR sys_tkill 462 PTR sys_sendfile64 463 PTR sys_futex 464#ifdef CONFIG_MIPS_MT_FPAFF 465 /* 466 * For FPU affinity scheduling on MIPS MT processors, we need to 467 * intercept sys_sched_xxxaffinity() calls until we get a proper hook 468 * in kernel/sched/core.c. Considered only temporary we only support 469 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor 470 * atm. 471 */ 472 PTR mipsmt_sys_sched_setaffinity 473 PTR mipsmt_sys_sched_getaffinity 474#else 475 PTR sys_sched_setaffinity 476 PTR sys_sched_getaffinity /* 4240 */ 477#endif /* CONFIG_MIPS_MT_FPAFF */ 478 PTR sys_io_setup 479 PTR sys_io_destroy 480 PTR sys_io_getevents 481 PTR sys_io_submit 482 PTR sys_io_cancel /* 4245 */ 483 PTR sys_exit_group 484 PTR sys_lookup_dcookie 485 PTR sys_epoll_create 486 PTR sys_epoll_ctl 487 PTR sys_epoll_wait /* 4250 */ 488 PTR sys_remap_file_pages 489 PTR sys_set_tid_address 490 PTR sys_restart_syscall 491 PTR sys_fadvise64_64 492 PTR sys_statfs64 /* 4255 */ 493 PTR sys_fstatfs64 494 PTR sys_timer_create 495 PTR sys_timer_settime 496 PTR sys_timer_gettime 497 PTR sys_timer_getoverrun /* 4260 */ 498 PTR sys_timer_delete 499 PTR sys_clock_settime 500 PTR sys_clock_gettime 501 PTR sys_clock_getres 502 PTR sys_clock_nanosleep /* 4265 */ 503 PTR sys_tgkill 504 PTR sys_utimes 505 PTR sys_mbind 506 PTR sys_get_mempolicy 507 PTR sys_set_mempolicy /* 4270 */ 508 PTR sys_mq_open 509 PTR sys_mq_unlink 510 PTR sys_mq_timedsend 511 PTR sys_mq_timedreceive 512 PTR sys_mq_notify /* 4275 */ 513 PTR sys_mq_getsetattr 514 PTR sys_ni_syscall /* sys_vserver */ 515 PTR sys_waitid 516 PTR sys_ni_syscall /* available, was setaltroot */ 517 PTR sys_add_key /* 4280 */ 518 PTR sys_request_key 519 PTR sys_keyctl 520 PTR sys_set_thread_area 521 PTR sys_inotify_init 522 PTR sys_inotify_add_watch /* 4285 */ 523 PTR sys_inotify_rm_watch 524 PTR sys_migrate_pages 525 PTR sys_openat 526 PTR sys_mkdirat 527 PTR sys_mknodat /* 4290 */ 528 PTR sys_fchownat 529 PTR sys_futimesat 530 PTR sys_fstatat64 531 PTR sys_unlinkat 532 PTR sys_renameat /* 4295 */ 533 PTR sys_linkat 534 PTR sys_symlinkat 535 PTR sys_readlinkat 536 PTR sys_fchmodat 537 PTR sys_faccessat /* 4300 */ 538 PTR sys_pselect6 539 PTR sys_ppoll 540 PTR sys_unshare 541 PTR sys_splice 542 PTR sys_sync_file_range /* 4305 */ 543 PTR sys_tee 544 PTR sys_vmsplice 545 PTR sys_move_pages 546 PTR sys_set_robust_list 547 PTR sys_get_robust_list /* 4310 */ 548 PTR sys_kexec_load 549 PTR sys_getcpu 550 PTR sys_epoll_pwait 551 PTR sys_ioprio_set 552 PTR sys_ioprio_get /* 4315 */ 553 PTR sys_utimensat 554 PTR sys_signalfd 555 PTR sys_ni_syscall /* was timerfd */ 556 PTR sys_eventfd 557 PTR sys_fallocate /* 4320 */ 558 PTR sys_timerfd_create 559 PTR sys_timerfd_gettime 560 PTR sys_timerfd_settime 561 PTR sys_signalfd4 562 PTR sys_eventfd2 /* 4325 */ 563 PTR sys_epoll_create1 564 PTR sys_dup3 565 PTR sys_pipe2 566 PTR sys_inotify_init1 567 PTR sys_preadv /* 4330 */ 568 PTR sys_pwritev 569 PTR sys_rt_tgsigqueueinfo 570 PTR sys_perf_event_open 571 PTR sys_accept4 572 PTR sys_recvmmsg /* 4335 */ 573 PTR sys_fanotify_init 574 PTR sys_fanotify_mark 575 PTR sys_prlimit64 576 PTR sys_name_to_handle_at 577 PTR sys_open_by_handle_at /* 4340 */ 578 PTR sys_clock_adjtime 579 PTR sys_syncfs 580 PTR sys_sendmmsg 581 PTR sys_setns 582 PTR sys_process_vm_readv /* 4345 */ 583 PTR sys_process_vm_writev 584 PTR sys_kcmp 585 PTR sys_finit_module 586 PTR sys_sched_setattr 587 PTR sys_sched_getattr /* 4350 */ 588 PTR sys_renameat2 589 PTR sys_seccomp 590 PTR sys_getrandom 591 PTR sys_memfd_create 592 PTR sys_bpf /* 4355 */ 593 PTR sys_execveat 594 PTR sys_userfaultfd 595 PTR sys_membarrier 596 PTR sys_mlock2 597 PTR sys_copy_file_range /* 4360 */ 598 PTR sys_preadv2 599 PTR sys_pwritev2 600