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 28NESTED(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 71 721: lw a4, 16(t0) # argument #5 from usp 732: lw a5, 20(t0) # argument #6 from usp 743: lw a6, 24(t0) # argument #7 from usp 754: 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 991: sd v0, PT_R2(sp) # result 100 101o32_syscall_exit: 102 j syscall_exit_partial 103 104/* ------------------------------------------------------------------------ */ 105 106trace_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 1301: 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 1541: sd v0, PT_R2(sp) # result 155 1562: j syscall_exit 157 158/* ------------------------------------------------------------------------ */ 159 160 /* 161 * The stackpointer for a call with more than 4 arguments is bad. 162 */ 163bad_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 170not_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 182LEAF(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 205einval: li v0, -ENOSYS 206 jr ra 207 END(sys32_syscall) 208 209 .align 3 210 .type sys32_call_table,@object 211EXPORT(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 PTR sys_getrandom 566 PTR sys_memfd_create 567 PTR sys_bpf /* 4355 */ 568 .size sys32_call_table,.-sys32_call_table 569