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/config.h> 17#include <linux/errno.h> 18#include <asm/asm.h> 19#include <asm/asmmacro.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 STI 32 .set at 33 ld t1, PT_EPC(sp) # skip syscall on return 34 35 dsubu t0, v0, __NR_O32_Linux # check syscall number 36 sltiu t0, t0, __NR_O32_Linux_syscalls + 1 37 daddiu t1, 4 # skip to next instruction 38 sd t1, PT_EPC(sp) 39 beqz t0, not_o32_scall 40#if 0 41 SAVE_ALL 42 move a1, v0 43 PRINT("Scall %ld\n") 44 RESTORE_ALL 45#endif 46 47 /* We don't want to stumble over broken sign extensions from 48 userland. O32 does never use the upper half. */ 49 sll a0, a0, 0 50 sll a1, a1, 0 51 sll a2, a2, 0 52 sll a3, a3, 0 53 54 dsll t0, v0, 3 # offset into table 55 ld t2, (sys_call_table - (__NR_O32_Linux * 8))(t0) 56 57 sd a3, PT_R26(sp) # save a3 for syscall restarting 58 59 /* 60 * More than four arguments. Try to deal with it by copying the 61 * stack arguments from the user stack to the kernel stack. 62 * This Sucks (TM). 63 * 64 * We intentionally keep the kernel stack a little below the top of 65 * userspace so we don't have to do a slower byte accurate check here. 66 */ 67 ld t0, PT_R29(sp) # get old user stack pointer 68 daddu t1, t0, 32 69 bltz t1, bad_stack 70 711: lw a4, 16(t0) # argument #5 from usp 722: lw a5, 20(t0) # argument #6 from usp 733: lw a6, 24(t0) # argument #7 from usp 744: lw a7, 28(t0) # argument #8 from usp (for indirect syscalls) 75 76 .section __ex_table,"a" 77 PTR 1b, bad_stack 78 PTR 2b, bad_stack 79 PTR 3b, bad_stack 80 PTR 4b, bad_stack 81 .previous 82 83 li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT 84 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? 85 and t0, t1, t0 86 bnez t0, trace_a_syscall 87 88 jalr t2 # Do The Real Thing (TM) 89 90 li t0, -EMAXERRNO - 1 # error? 91 sltu t0, t0, v0 92 sd t0, PT_R7(sp) # set error flag 93 beqz t0, 1f 94 95 dnegu v0 # error 96 sd v0, PT_R0(sp) # flag for syscall restarting 971: sd v0, PT_R2(sp) # result 98 99o32_syscall_exit: 100 local_irq_disable # make need_resched and 101 # signals dont change between 102 # sampling and return 103 LONG_L a2, TI_FLAGS($28) 104 li t0, _TIF_ALLWORK_MASK 105 and t0, a2, t0 106 bnez t0, o32_syscall_exit_work 107 108 j restore_partial 109 110o32_syscall_exit_work: 111 j syscall_exit_work_partial 112 113/* ------------------------------------------------------------------------ */ 114 115trace_a_syscall: 116 SAVE_STATIC 117 sd a4, PT_R8(sp) # Save argument registers 118 sd a5, PT_R9(sp) 119 sd a6, PT_R10(sp) 120 sd a7, PT_R11(sp) # For indirect syscalls 121 122 move s0, t2 # Save syscall pointer 123 move a0, sp 124 li a1, 0 125 jal do_syscall_trace 126 127 move t0, s0 128 RESTORE_STATIC 129 ld a0, PT_R4(sp) # Restore argument registers 130 ld a1, PT_R5(sp) 131 ld a2, PT_R6(sp) 132 ld a3, PT_R7(sp) 133 ld a4, PT_R8(sp) 134 ld a5, PT_R9(sp) 135 ld a6, PT_R10(sp) 136 ld a7, PT_R11(sp) # For indirect syscalls 137 jalr t0 138 139 li t0, -EMAXERRNO - 1 # error? 140 sltu t0, t0, v0 141 sd t0, PT_R7(sp) # set error flag 142 beqz t0, 1f 143 144 dnegu v0 # error 145 sd v0, PT_R0(sp) # set flag for syscall restarting 1461: sd v0, PT_R2(sp) # result 147 148 j syscall_exit 149 150/* ------------------------------------------------------------------------ */ 151 152 /* 153 * The stackpointer for a call with more than 4 arguments is bad. 154 */ 155bad_stack: 156 dnegu v0 # error 157 sd v0, PT_R0(sp) 158 sd v0, PT_R2(sp) 159 li t0, 1 # set error flag 160 sd t0, PT_R7(sp) 161 j o32_syscall_exit 162 163not_o32_scall: 164 /* 165 * This is not an o32 compatibility syscall, pass it on 166 * to the 64-bit syscall handlers. 167 */ 168#ifdef CONFIG_MIPS32_N32 169 j handle_sysn32 170#else 171 j handle_sys64 172#endif 173 END(handle_sys) 174 175LEAF(sys32_syscall) 176 sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1 177 beqz v0, einval 178 179 dsll v0, a0, 3 180 ld t2, (sys_call_table - (__NR_O32_Linux * 8))(v0) 181 182 li v1, 4000 # indirect syscall number 183 beq a0, v1, einval # do not recurse 184 185 move a0, a1 # shift argument registers 186 move a1, a2 187 move a2, a3 188 move a3, a4 189 move a4, a5 190 move a5, a6 191 move a6, a7 192 sd a0, PT_R4(sp) # ... and push back a0 - a3, some 193 sd a1, PT_R5(sp) # syscalls expect them there 194 sd a2, PT_R6(sp) 195 sd a3, PT_R7(sp) 196 sd a3, PT_R26(sp) # update a3 for syscall restarting 197 jr t2 198 /* Unreached */ 199 200einval: li v0, -EINVAL 201 jr ra 202 END(sys32_syscall) 203 204 .align 3 205 .type sys_call_table,@object 206sys_call_table: 207 PTR sys32_syscall /* 4000 */ 208 PTR sys_exit 209 PTR sys_fork 210 PTR sys_read 211 PTR sys_write 212 PTR compat_sys_open /* 4005 */ 213 PTR sys_close 214 PTR sys_waitpid 215 PTR sys_creat 216 PTR sys_link 217 PTR sys_unlink /* 4010 */ 218 PTR sys32_execve 219 PTR sys_chdir 220 PTR compat_sys_time 221 PTR sys_mknod 222 PTR sys_chmod /* 4015 */ 223 PTR sys_lchown 224 PTR sys_ni_syscall 225 PTR sys_ni_syscall /* was sys_stat */ 226 PTR sys_lseek 227 PTR sys_getpid /* 4020 */ 228 PTR sys_mount 229 PTR sys_oldumount 230 PTR sys_setuid 231 PTR sys_getuid 232 PTR compat_sys_stime /* 4025 */ 233 PTR sys32_ptrace 234 PTR sys_alarm 235 PTR sys_ni_syscall /* was sys_fstat */ 236 PTR sys_pause 237 PTR compat_sys_utime /* 4030 */ 238 PTR sys_ni_syscall 239 PTR sys_ni_syscall 240 PTR sys_access 241 PTR sys_nice 242 PTR sys_ni_syscall /* 4035 */ 243 PTR sys_sync 244 PTR sys_kill 245 PTR sys_rename 246 PTR sys_mkdir 247 PTR sys_rmdir /* 4040 */ 248 PTR sys_dup 249 PTR sys_pipe 250 PTR compat_sys_times 251 PTR sys_ni_syscall 252 PTR sys_brk /* 4045 */ 253 PTR sys_setgid 254 PTR sys_getgid 255 PTR sys_ni_syscall /* was signal 2 */ 256 PTR sys_geteuid 257 PTR sys_getegid /* 4050 */ 258 PTR sys_acct 259 PTR sys_umount 260 PTR sys_ni_syscall 261 PTR compat_sys_ioctl 262 PTR compat_sys_fcntl /* 4055 */ 263 PTR sys_ni_syscall 264 PTR sys_setpgid 265 PTR sys_ni_syscall 266 PTR sys_olduname 267 PTR sys_umask /* 4060 */ 268 PTR sys_chroot 269 PTR sys32_ustat 270 PTR sys_dup2 271 PTR sys_getppid 272 PTR sys_getpgrp /* 4065 */ 273 PTR sys_setsid 274 PTR sys32_sigaction 275 PTR sys_sgetmask 276 PTR sys_ssetmask 277 PTR sys_setreuid /* 4070 */ 278 PTR sys_setregid 279 PTR sys32_sigsuspend 280 PTR compat_sys_sigpending 281 PTR sys_sethostname 282 PTR compat_sys_setrlimit /* 4075 */ 283 PTR compat_sys_getrlimit 284 PTR compat_sys_getrusage 285 PTR sys32_gettimeofday 286 PTR sys32_settimeofday 287 PTR sys_getgroups /* 4080 */ 288 PTR sys_setgroups 289 PTR sys_ni_syscall /* old_select */ 290 PTR sys_symlink 291 PTR sys_ni_syscall /* was sys_lstat */ 292 PTR sys_readlink /* 4085 */ 293 PTR sys_uselib 294 PTR sys_swapon 295 PTR sys_reboot 296 PTR compat_sys_old_readdir 297 PTR old_mmap /* 4090 */ 298 PTR sys_munmap 299 PTR sys_truncate 300 PTR sys_ftruncate 301 PTR sys_fchmod 302 PTR sys_fchown /* 4095 */ 303 PTR sys_getpriority 304 PTR sys_setpriority 305 PTR sys_ni_syscall 306 PTR compat_sys_statfs 307 PTR compat_sys_fstatfs /* 4100 */ 308 PTR sys_ni_syscall /* sys_ioperm */ 309 PTR sys32_socketcall 310 PTR sys_syslog 311 PTR compat_sys_setitimer 312 PTR compat_sys_getitimer /* 4105 */ 313 PTR compat_sys_newstat 314 PTR compat_sys_newlstat 315 PTR compat_sys_newfstat 316 PTR sys_uname 317 PTR sys_ni_syscall /* sys_ioperm *//* 4110 */ 318 PTR sys_vhangup 319 PTR sys_ni_syscall /* was sys_idle */ 320 PTR sys_ni_syscall /* sys_vm86 */ 321 PTR compat_sys_wait4 322 PTR sys_swapoff /* 4115 */ 323 PTR sys32_sysinfo 324 PTR sys32_ipc 325 PTR sys_fsync 326 PTR sys32_sigreturn 327 PTR sys32_clone /* 4120 */ 328 PTR sys_setdomainname 329 PTR sys32_newuname 330 PTR sys_ni_syscall /* sys_modify_ldt */ 331 PTR compat_sys_adjtimex 332 PTR sys_mprotect /* 4125 */ 333 PTR compat_sys_sigprocmask 334 PTR sys_ni_syscall /* was creat_module */ 335 PTR sys_init_module 336 PTR sys_delete_module 337 PTR sys_ni_syscall /* 4130, get_kernel_syms */ 338 PTR sys_quotactl 339 PTR sys_getpgid 340 PTR sys_fchdir 341 PTR sys_bdflush 342 PTR sys_sysfs /* 4135 */ 343 PTR sys32_personality 344 PTR sys_ni_syscall /* for afs_syscall */ 345 PTR sys_setfsuid 346 PTR sys_setfsgid 347 PTR sys32_llseek /* 4140 */ 348 PTR compat_sys_getdents 349 PTR compat_sys_select 350 PTR sys_flock 351 PTR sys_msync 352 PTR compat_sys_readv /* 4145 */ 353 PTR compat_sys_writev 354 PTR sys_cacheflush 355 PTR sys_cachectl 356 PTR sys_sysmips 357 PTR sys_ni_syscall /* 4150 */ 358 PTR sys_getsid 359 PTR sys_fdatasync 360 PTR sys32_sysctl 361 PTR sys_mlock 362 PTR sys_munlock /* 4155 */ 363 PTR sys_mlockall 364 PTR sys_munlockall 365 PTR sys_sched_setparam 366 PTR sys_sched_getparam 367 PTR sys_sched_setscheduler /* 4160 */ 368 PTR sys_sched_getscheduler 369 PTR sys_sched_yield 370 PTR sys_sched_get_priority_max 371 PTR sys_sched_get_priority_min 372 PTR sys32_sched_rr_get_interval /* 4165 */ 373 PTR compat_sys_nanosleep 374 PTR sys_mremap 375 PTR sys_accept 376 PTR sys_bind 377 PTR sys_connect /* 4170 */ 378 PTR sys_getpeername 379 PTR sys_getsockname 380 PTR sys_getsockopt 381 PTR sys_listen 382 PTR sys_recv /* 4175 */ 383 PTR sys_recvfrom 384 PTR compat_sys_recvmsg 385 PTR sys_send 386 PTR compat_sys_sendmsg 387 PTR sys_sendto /* 4180 */ 388 PTR compat_sys_setsockopt 389 PTR sys_shutdown 390 PTR sys_socket 391 PTR sys_socketpair 392 PTR sys_setresuid /* 4185 */ 393 PTR sys_getresuid 394 PTR sys_ni_syscall /* was query_module */ 395 PTR sys_poll 396 PTR compat_sys_nfsservctl 397 PTR sys_setresgid /* 4190 */ 398 PTR sys_getresgid 399 PTR sys_prctl 400 PTR sys32_rt_sigreturn 401 PTR sys32_rt_sigaction 402 PTR sys32_rt_sigprocmask /* 4195 */ 403 PTR sys32_rt_sigpending 404 PTR compat_sys_rt_sigtimedwait 405 PTR sys32_rt_sigqueueinfo 406 PTR sys32_rt_sigsuspend 407 PTR sys32_pread /* 4200 */ 408 PTR sys32_pwrite 409 PTR sys_chown 410 PTR sys_getcwd 411 PTR sys_capget 412 PTR sys_capset /* 4205 */ 413 PTR sys32_sigaltstack 414 PTR sys32_sendfile 415 PTR sys_ni_syscall 416 PTR sys_ni_syscall 417 PTR sys32_mmap2 /* 4210 */ 418 PTR sys32_truncate64 419 PTR sys32_ftruncate64 420 PTR sys_newstat 421 PTR sys_newlstat 422 PTR sys_newfstat /* 4215 */ 423 PTR sys_pivot_root 424 PTR sys_mincore 425 PTR sys_madvise 426 PTR sys_getdents64 427 PTR compat_sys_fcntl64 /* 4220 */ 428 PTR sys_ni_syscall 429 PTR sys_gettid 430 PTR sys32_readahead 431 PTR sys_setxattr 432 PTR sys_lsetxattr /* 4225 */ 433 PTR sys_fsetxattr 434 PTR sys_getxattr 435 PTR sys_lgetxattr 436 PTR sys_fgetxattr 437 PTR sys_listxattr /* 4230 */ 438 PTR sys_llistxattr 439 PTR sys_flistxattr 440 PTR sys_removexattr 441 PTR sys_lremovexattr 442 PTR sys_fremovexattr /* 4235 */ 443 PTR sys_tkill 444 PTR sys_sendfile64 445 PTR compat_sys_futex 446 PTR compat_sys_sched_setaffinity 447 PTR compat_sys_sched_getaffinity /* 4240 */ 448 PTR sys_io_setup 449 PTR sys_io_destroy 450 PTR sys_io_getevents 451 PTR sys_io_submit 452 PTR sys_io_cancel /* 4245 */ 453 PTR sys_exit_group 454 PTR sys_lookup_dcookie 455 PTR sys_epoll_create 456 PTR sys_epoll_ctl 457 PTR sys_epoll_wait /* 4250 */ 458 PTR sys_remap_file_pages 459 PTR sys_set_tid_address 460 PTR sys_restart_syscall 461 PTR sys_fadvise64_64 462 PTR compat_sys_statfs64 /* 4255 */ 463 PTR compat_sys_fstatfs64 464 PTR sys32_timer_create 465 PTR compat_sys_timer_settime 466 PTR compat_sys_timer_gettime 467 PTR sys_timer_getoverrun /* 4260 */ 468 PTR sys_timer_delete 469 PTR compat_sys_clock_settime 470 PTR compat_sys_clock_gettime 471 PTR compat_sys_clock_getres 472 PTR compat_sys_clock_nanosleep /* 4265 */ 473 PTR sys_tgkill 474 PTR compat_sys_utimes 475 PTR sys_ni_syscall /* sys_mbind */ 476 PTR sys_ni_syscall /* sys_get_mempolicy */ 477 PTR sys_ni_syscall /* 4270 sys_set_mempolicy */ 478 PTR compat_sys_mq_open 479 PTR sys_mq_unlink 480 PTR compat_sys_mq_timedsend 481 PTR compat_sys_mq_timedreceive 482 PTR compat_sys_mq_notify /* 4275 */ 483 PTR compat_sys_mq_getsetattr 484 PTR sys_ni_syscall /* sys_vserver */ 485 PTR sys32_waitid 486 PTR sys_ni_syscall /* available, was setaltroot */ 487 PTR sys_add_key /* 4280 */ 488 PTR sys_request_key 489 PTR sys_keyctl 490 PTR sys_set_thread_area 491 PTR sys_inotify_init 492 PTR sys_inotify_add_watch /* 4285 */ 493 PTR sys_inotify_rm_watch 494 PTR sys_migrate_pages 495 PTR compat_sys_openat 496 PTR sys_mkdirat 497 PTR sys_mknodat /* 4290 */ 498 PTR sys_fchownat 499 PTR compat_sys_futimesat 500 PTR compat_sys_newfstatat 501 PTR sys_unlinkat 502 PTR sys_renameat /* 4295 */ 503 PTR sys_linkat 504 PTR sys_symlinkat 505 PTR sys_readlinkat 506 PTR sys_fchmodat 507 PTR sys_faccessat /* 4300 */ 508 PTR sys_pselect6 509 PTR sys_ppoll 510 PTR sys_unshare 511 PTR sys_splice 512 PTR sys32_sync_file_range /* 4305 */ 513 .size sys_call_table,.-sys_call_table 514