xref: /openbmc/linux/arch/mips/kernel/scall32-o32.S (revision 9ffc93f2) 
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 */
10#include <linux/errno.h>
11#include <asm/asm.h>
12#include <asm/asmmacro.h>
13#include <asm/irqflags.h>
14#include <asm/mipsregs.h>
15#include <asm/regdef.h>
16#include <asm/stackframe.h>
17#include <asm/isadep.h>
18#include <asm/sysmips.h>
19#include <asm/thread_info.h>
20#include <asm/unistd.h>
21#include <asm/war.h>
22#include <asm/asm-offsets.h>
23
24/* Highest syscall used of any syscall flavour */
25#define MAX_SYSCALL_NO	__NR_O32_Linux + __NR_O32_Linux_syscalls
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
35	lw	t1, PT_EPC(sp)		# skip syscall on return
36
37	subu	v0, v0, __NR_O32_Linux	# check syscall number
38	sltiu	t0, v0, __NR_O32_Linux_syscalls + 1
39	addiu	t1, 4			# skip to next instruction
40	sw	t1, PT_EPC(sp)
41	beqz	t0, illegal_syscall
42
43	sll	t0, v0, 3
44	la	t1, sys_call_table
45	addu	t1, t0
46	lw	t2, (t1)		# syscall routine
47	lw	t3, 4(t1)		# >= 0 if we need stack arguments
48	beqz	t2, illegal_syscall
49
50	sw	a3, PT_R26(sp)		# save a3 for syscall restarting
51	bgez	t3, stackargs
52
53stack_done:
54	lw	t0, TI_FLAGS($28)	# syscall tracing enabled?
55	li	t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
56	and	t0, t1
57	bnez	t0, syscall_trace_entry	# -> yes
58
59	jalr	t2			# Do The Real Thing (TM)
60
61	li	t0, -EMAXERRNO - 1	# error?
62	sltu	t0, t0, v0
63	sw	t0, PT_R7(sp)		# set error flag
64	beqz	t0, 1f
65
66	lw	t1, PT_R2(sp)		# syscall number
67	negu	v0			# error
68	sw	t1, PT_R0(sp)		# save it for syscall restarting
691:	sw	v0, PT_R2(sp)		# result
70
71o32_syscall_exit:
72	local_irq_disable		# make sure need_resched and
73					# signals dont change between
74					# sampling and return
75	lw	a2, TI_FLAGS($28)	# current->work
76	li	t0, _TIF_ALLWORK_MASK
77	and	t0, a2
78	bnez	t0, o32_syscall_exit_work
79
80	j	restore_partial
81
82o32_syscall_exit_work:
83	j	syscall_exit_work_partial
84
85/* ------------------------------------------------------------------------ */
86
87syscall_trace_entry:
88	SAVE_STATIC
89	move	s0, t2
90	move	a0, sp
91	jal	syscall_trace_enter
92
93	move	t0, s0
94	RESTORE_STATIC
95	lw	a0, PT_R4(sp)		# Restore argument registers
96	lw	a1, PT_R5(sp)
97	lw	a2, PT_R6(sp)
98	lw	a3, PT_R7(sp)
99	jalr	t0
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
111	j	syscall_exit
112
113/* ------------------------------------------------------------------------ */
114
115	/*
116	 * More than four arguments.  Try to deal with it by copying the
117	 * stack arguments from the user stack to the kernel stack.
118	 * This Sucks (TM).
119	 */
120stackargs:
121	lw	t0, PT_R29(sp)		# get old user stack pointer
122
123	/*
124	 * We intentionally keep the kernel stack a little below the top of
125	 * userspace so we don't have to do a slower byte accurate check here.
126	 */
127	lw	t5, TI_ADDR_LIMIT($28)
128	addu	t4, t0, 32
129	and	t5, t4
130	bltz	t5, bad_stack		# -> sp is bad
131
132	/* Ok, copy the args from the luser stack to the kernel stack.
133	 * t3 is the precomputed number of instruction bytes needed to
134	 * load or store arguments 6-8.
135	 */
136
137	la	t1, 5f			# load up to 3 arguments
138	subu	t1, t3
1391:	lw	t5, 16(t0)		# argument #5 from usp
140	.set    push
141	.set    noreorder
142	.set	nomacro
143	jr	t1
144	 addiu	t1, 6f - 5f
145
1462:	lw	t8, 28(t0)		# argument #8 from usp
1473:	lw	t7, 24(t0)		# argument #7 from usp
1484:	lw	t6, 20(t0)		# argument #6 from usp
1495:	jr	t1
150	 sw	t5, 16(sp)		# argument #5 to ksp
151
152	sw	t8, 28(sp)		# argument #8 to ksp
153	sw	t7, 24(sp)		# argument #7 to ksp
154	sw	t6, 20(sp)		# argument #6 to ksp
1556:	j	stack_done		# go back
156	 nop
157	.set	pop
158
159	.section __ex_table,"a"
160	PTR	1b,bad_stack
161	PTR	2b,bad_stack
162	PTR	3b,bad_stack
163	PTR	4b,bad_stack
164	.previous
165
166	/*
167	 * The stackpointer for a call with more than 4 arguments is bad.
168	 * We probably should handle this case a bit more drastic.
169	 */
170bad_stack:
171	li	v0, EFAULT
172	sw	v0, PT_R2(sp)
173	li	t0, 1				# set error flag
174	sw	t0, PT_R7(sp)
175	j	o32_syscall_exit
176
177	/*
178	 * The system call does not exist in this kernel
179	 */
180illegal_syscall:
181	li	v0, ENOSYS			# error
182	sw	v0, PT_R2(sp)
183	li	t0, 1				# set error flag
184	sw	t0, PT_R7(sp)
185	j	o32_syscall_exit
186	END(handle_sys)
187
188	LEAF(sys_syscall)
189	subu	t0, a0, __NR_O32_Linux	# check syscall number
190	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
191	beqz	t0, einval		# do not recurse
192	sll	t1, t0, 3
193	beqz	v0, einval
194	lw	t2, sys_call_table(t1)		# syscall routine
195
196	/* Some syscalls like execve get their arguments from struct pt_regs
197	   and claim zero arguments in the syscall table. Thus we have to
198	   assume the worst case and shuffle around all potential arguments.
199	   If you want performance, don't use indirect syscalls. */
200
201	move	a0, a1				# shift argument registers
202	move	a1, a2
203	move	a2, a3
204	lw	a3, 16(sp)
205	lw	t4, 20(sp)
206	lw	t5, 24(sp)
207	lw	t6, 28(sp)
208	sw	t4, 16(sp)
209	sw	t5, 20(sp)
210	sw	t6, 24(sp)
211	sw	a0, PT_R4(sp)			# .. and push back a0 - a3, some
212	sw	a1, PT_R5(sp)			# syscalls expect them there
213	sw	a2, PT_R6(sp)
214	sw	a3, PT_R7(sp)
215	sw	a3, PT_R26(sp)			# update a3 for syscall restarting
216	jr	t2
217	/* Unreached */
218
219einval:	li	v0, -ENOSYS
220	jr	ra
221	END(sys_syscall)
222
223	.macro	fifty ptr, nargs, from=1, to=50
224	sys	\ptr		\nargs
225	.if	\to-\from
226	fifty	\ptr,\nargs,"(\from+1)",\to
227	.endif
228	.endm
229
230	.macro	mille ptr, nargs, from=1, to=20
231	fifty	\ptr,\nargs
232	.if	\to-\from
233	mille	\ptr,\nargs,"(\from+1)",\to
234	.endif
235	.endm
236
237	.macro	syscalltable
238	sys	sys_syscall		8	/* 4000 */
239	sys	sys_exit		1
240	sys	sys_fork		0
241	sys	sys_read		3
242	sys	sys_write		3
243	sys	sys_open		3	/* 4005 */
244	sys	sys_close		1
245	sys	sys_waitpid		3
246	sys	sys_creat		2
247	sys	sys_link		2
248	sys	sys_unlink		1	/* 4010 */
249	sys	sys_execve		0
250	sys	sys_chdir		1
251	sys	sys_time		1
252	sys	sys_mknod		3
253	sys	sys_chmod		2	/* 4015 */
254	sys	sys_lchown		3
255	sys	sys_ni_syscall		0
256	sys	sys_ni_syscall		0	/* was sys_stat */
257	sys	sys_lseek		3
258	sys	sys_getpid		0	/* 4020 */
259	sys	sys_mount		5
260	sys	sys_oldumount		1
261	sys	sys_setuid		1
262	sys	sys_getuid		0
263	sys	sys_stime		1	/* 4025 */
264	sys	sys_ptrace		4
265	sys	sys_alarm		1
266	sys	sys_ni_syscall		0	/* was sys_fstat */
267	sys	sys_pause		0
268	sys	sys_utime		2	/* 4030 */
269	sys	sys_ni_syscall		0
270	sys	sys_ni_syscall		0
271	sys	sys_access		2
272	sys	sys_nice		1
273	sys	sys_ni_syscall		0	/* 4035 */
274	sys	sys_sync		0
275	sys	sys_kill		2
276	sys	sys_rename		2
277	sys	sys_mkdir		2
278	sys	sys_rmdir		1	/* 4040 */
279	sys	sys_dup			1
280	sys	sysm_pipe		0
281	sys	sys_times		1
282	sys	sys_ni_syscall		0
283	sys	sys_brk			1	/* 4045 */
284	sys	sys_setgid		1
285	sys	sys_getgid		0
286	sys	sys_ni_syscall		0	/* was signal(2) */
287	sys	sys_geteuid		0
288	sys	sys_getegid		0	/* 4050 */
289	sys	sys_acct		1
290	sys	sys_umount		2
291	sys	sys_ni_syscall		0
292	sys	sys_ioctl		3
293	sys	sys_fcntl		3	/* 4055 */
294	sys	sys_ni_syscall		2
295	sys	sys_setpgid		2
296	sys	sys_ni_syscall		0
297	sys	sys_olduname		1
298	sys	sys_umask		1	/* 4060 */
299	sys	sys_chroot		1
300	sys	sys_ustat		2
301	sys	sys_dup2		2
302	sys	sys_getppid		0
303	sys	sys_getpgrp		0	/* 4065 */
304	sys	sys_setsid		0
305	sys	sys_sigaction		3
306	sys	sys_sgetmask		0
307	sys	sys_ssetmask		1
308	sys	sys_setreuid		2	/* 4070 */
309	sys	sys_setregid		2
310	sys	sys_sigsuspend		0
311	sys	sys_sigpending		1
312	sys	sys_sethostname		2
313	sys	sys_setrlimit		2	/* 4075 */
314	sys	sys_getrlimit		2
315	sys	sys_getrusage		2
316	sys	sys_gettimeofday	2
317	sys	sys_settimeofday	2
318	sys	sys_getgroups		2	/* 4080 */
319	sys	sys_setgroups		2
320	sys	sys_ni_syscall		0	/* old_select */
321	sys	sys_symlink		2
322	sys	sys_ni_syscall		0	/* was sys_lstat */
323	sys	sys_readlink		3	/* 4085 */
324	sys	sys_uselib		1
325	sys	sys_swapon		2
326	sys	sys_reboot		3
327	sys	sys_old_readdir		3
328	sys	sys_mips_mmap		6	/* 4090 */
329	sys	sys_munmap		2
330	sys	sys_truncate		2
331	sys	sys_ftruncate		2
332	sys	sys_fchmod		2
333	sys	sys_fchown		3	/* 4095 */
334	sys	sys_getpriority		2
335	sys	sys_setpriority		3
336	sys	sys_ni_syscall		0
337	sys	sys_statfs		2
338	sys	sys_fstatfs		2	/* 4100 */
339	sys	sys_ni_syscall		0	/* was ioperm(2) */
340	sys	sys_socketcall		2
341	sys	sys_syslog		3
342	sys	sys_setitimer		3
343	sys	sys_getitimer		2	/* 4105 */
344	sys	sys_newstat		2
345	sys	sys_newlstat		2
346	sys	sys_newfstat		2
347	sys	sys_uname		1
348	sys	sys_ni_syscall		0	/* 4110 was iopl(2) */
349	sys	sys_vhangup		0
350	sys	sys_ni_syscall		0	/* was sys_idle() */
351	sys	sys_ni_syscall		0	/* was sys_vm86 */
352	sys	sys_wait4		4
353	sys	sys_swapoff		1	/* 4115 */
354	sys	sys_sysinfo		1
355	sys	sys_ipc			6
356	sys	sys_fsync		1
357	sys	sys_sigreturn		0
358	sys	sys_clone		0	/* 4120 */
359	sys	sys_setdomainname	2
360	sys	sys_newuname		1
361	sys	sys_ni_syscall		0	/* sys_modify_ldt */
362	sys	sys_adjtimex		1
363	sys	sys_mprotect		3	/* 4125 */
364	sys	sys_sigprocmask		3
365	sys	sys_ni_syscall		0	/* was create_module */
366	sys	sys_init_module		5
367	sys	sys_delete_module	1
368	sys	sys_ni_syscall		0	/* 4130	was get_kernel_syms */
369	sys	sys_quotactl		4
370	sys	sys_getpgid		1
371	sys	sys_fchdir		1
372	sys	sys_bdflush		2
373	sys	sys_sysfs		3	/* 4135 */
374	sys	sys_personality		1
375	sys	sys_ni_syscall		0	/* for afs_syscall */
376	sys	sys_setfsuid		1
377	sys	sys_setfsgid		1
378	sys	sys_llseek		5	/* 4140 */
379	sys	sys_getdents		3
380	sys	sys_select		5
381	sys	sys_flock		2
382	sys	sys_msync		3
383	sys	sys_readv		3	/* 4145 */
384	sys	sys_writev		3
385	sys	sys_cacheflush		3
386	sys	sys_cachectl		3
387	sys	sys_sysmips		4
388	sys	sys_ni_syscall		0	/* 4150 */
389	sys	sys_getsid		1
390	sys	sys_fdatasync		1
391	sys	sys_sysctl		1
392	sys	sys_mlock		2
393	sys	sys_munlock		2	/* 4155 */
394	sys	sys_mlockall		1
395	sys	sys_munlockall		0
396	sys	sys_sched_setparam	2
397	sys	sys_sched_getparam	2
398	sys	sys_sched_setscheduler	3	/* 4160 */
399	sys	sys_sched_getscheduler	1
400	sys	sys_sched_yield		0
401	sys	sys_sched_get_priority_max 1
402	sys	sys_sched_get_priority_min 1
403	sys	sys_sched_rr_get_interval 2	/* 4165 */
404	sys	sys_nanosleep,		2
405	sys	sys_mremap,		5
406	sys	sys_accept		3
407	sys	sys_bind		3
408	sys	sys_connect		3	/* 4170 */
409	sys	sys_getpeername		3
410	sys	sys_getsockname		3
411	sys	sys_getsockopt		5
412	sys	sys_listen		2
413	sys	sys_recv		4	/* 4175 */
414	sys	sys_recvfrom		6
415	sys	sys_recvmsg		3
416	sys	sys_send		4
417	sys	sys_sendmsg		3
418	sys	sys_sendto		6	/* 4180 */
419	sys	sys_setsockopt		5
420	sys	sys_shutdown		2
421	sys	sys_socket		3
422	sys	sys_socketpair		4
423	sys	sys_setresuid		3	/* 4185 */
424	sys	sys_getresuid		3
425	sys	sys_ni_syscall		0	/* was sys_query_module */
426	sys	sys_poll		3
427	sys	sys_ni_syscall		0	/* was nfsservctl */
428	sys	sys_setresgid		3	/* 4190 */
429	sys	sys_getresgid		3
430	sys	sys_prctl		5
431	sys	sys_rt_sigreturn	0
432	sys	sys_rt_sigaction	4
433	sys	sys_rt_sigprocmask	4	/* 4195 */
434	sys	sys_rt_sigpending	2
435	sys	sys_rt_sigtimedwait	4
436	sys	sys_rt_sigqueueinfo	3
437	sys	sys_rt_sigsuspend	0
438	sys	sys_pread64		6	/* 4200 */
439	sys	sys_pwrite64		6
440	sys	sys_chown		3
441	sys	sys_getcwd		2
442	sys	sys_capget		2
443	sys	sys_capset		2	/* 4205 */
444	sys	sys_sigaltstack		0
445	sys	sys_sendfile		4
446	sys	sys_ni_syscall		0
447	sys	sys_ni_syscall		0
448	sys	sys_mips_mmap2		6	/* 4210 */
449	sys	sys_truncate64		4
450	sys	sys_ftruncate64		4
451	sys	sys_stat64		2
452	sys	sys_lstat64		2
453	sys	sys_fstat64		2	/* 4215 */
454	sys	sys_pivot_root		2
455	sys	sys_mincore		3
456	sys	sys_madvise		3
457	sys	sys_getdents64		3
458	sys	sys_fcntl64		3	/* 4220 */
459	sys	sys_ni_syscall		0
460	sys	sys_gettid		0
461	sys	sys_readahead		5
462	sys	sys_setxattr		5
463	sys	sys_lsetxattr		5	/* 4225 */
464	sys	sys_fsetxattr		5
465	sys	sys_getxattr		4
466	sys	sys_lgetxattr		4
467	sys	sys_fgetxattr		4
468	sys	sys_listxattr		3	/* 4230 */
469	sys	sys_llistxattr		3
470	sys	sys_flistxattr		3
471	sys	sys_removexattr		2
472	sys	sys_lremovexattr	2
473	sys	sys_fremovexattr	2	/* 4235 */
474	sys	sys_tkill		2
475	sys	sys_sendfile64		5
476	sys	sys_futex		6
477#ifdef CONFIG_MIPS_MT_FPAFF
478	/*
479	 * For FPU affinity scheduling on MIPS MT processors, we need to
480	 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
481	 * in kernel/sched.c.  Considered only temporary we only support these
482	 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
483	 */
484	sys	mipsmt_sys_sched_setaffinity	3
485	sys	mipsmt_sys_sched_getaffinity	3
486#else
487	sys	sys_sched_setaffinity	3
488	sys	sys_sched_getaffinity	3	/* 4240 */
489#endif /* CONFIG_MIPS_MT_FPAFF */
490	sys	sys_io_setup		2
491	sys	sys_io_destroy		1
492	sys	sys_io_getevents	5
493	sys	sys_io_submit		3
494	sys	sys_io_cancel		3	/* 4245 */
495	sys	sys_exit_group		1
496	sys	sys_lookup_dcookie	4
497	sys	sys_epoll_create	1
498	sys	sys_epoll_ctl		4
499	sys	sys_epoll_wait		4	/* 4250 */
500	sys	sys_remap_file_pages	5
501	sys	sys_set_tid_address	1
502	sys	sys_restart_syscall	0
503	sys	sys_fadvise64_64	7
504	sys	sys_statfs64		3	/* 4255 */
505	sys	sys_fstatfs64		2
506	sys	sys_timer_create	3
507	sys	sys_timer_settime	4
508	sys	sys_timer_gettime	2
509	sys	sys_timer_getoverrun	1	/* 4260 */
510	sys	sys_timer_delete	1
511	sys	sys_clock_settime	2
512	sys	sys_clock_gettime	2
513	sys	sys_clock_getres	2
514	sys	sys_clock_nanosleep	4	/* 4265 */
515	sys	sys_tgkill		3
516	sys	sys_utimes		2
517	sys	sys_mbind		4
518	sys	sys_ni_syscall		0	/* sys_get_mempolicy */
519	sys	sys_ni_syscall		0	/* 4270 sys_set_mempolicy */
520	sys	sys_mq_open		4
521	sys	sys_mq_unlink		1
522	sys	sys_mq_timedsend	5
523	sys	sys_mq_timedreceive	5
524	sys	sys_mq_notify		2	/* 4275 */
525	sys	sys_mq_getsetattr	3
526	sys	sys_ni_syscall		0	/* sys_vserver */
527	sys	sys_waitid		5
528	sys	sys_ni_syscall		0	/* available, was setaltroot */
529	sys	sys_add_key		5	/* 4280 */
530	sys	sys_request_key		4
531	sys	sys_keyctl		5
532	sys	sys_set_thread_area	1
533	sys	sys_inotify_init	0
534	sys	sys_inotify_add_watch	3	/* 4285 */
535	sys	sys_inotify_rm_watch	2
536	sys	sys_migrate_pages	4
537	sys	sys_openat		4
538	sys	sys_mkdirat		3
539	sys	sys_mknodat		4	/* 4290 */
540	sys	sys_fchownat		5
541	sys	sys_futimesat		3
542	sys	sys_fstatat64		4
543	sys	sys_unlinkat		3
544	sys	sys_renameat		4	/* 4295 */
545	sys	sys_linkat		5
546	sys	sys_symlinkat		3
547	sys	sys_readlinkat		4
548	sys	sys_fchmodat		3
549	sys	sys_faccessat		3	/* 4300 */
550	sys	sys_pselect6		6
551	sys	sys_ppoll		5
552	sys	sys_unshare		1
553	sys	sys_splice		6
554	sys	sys_sync_file_range	7	/* 4305 */
555	sys	sys_tee			4
556	sys	sys_vmsplice		4
557	sys	sys_move_pages		6
558	sys	sys_set_robust_list	2
559	sys	sys_get_robust_list	3	/* 4310 */
560	sys	sys_kexec_load		4
561	sys	sys_getcpu		3
562	sys	sys_epoll_pwait		6
563	sys	sys_ioprio_set		3
564	sys	sys_ioprio_get		2	/* 4315 */
565	sys	sys_utimensat		4
566	sys	sys_signalfd		3
567	sys	sys_ni_syscall		0	/* was timerfd */
568	sys	sys_eventfd		1
569	sys	sys_fallocate		6	/* 4320 */
570	sys	sys_timerfd_create	2
571	sys	sys_timerfd_gettime	2
572	sys	sys_timerfd_settime	4
573	sys	sys_signalfd4		4
574	sys	sys_eventfd2		2	/* 4325 */
575	sys	sys_epoll_create1	1
576	sys	sys_dup3		3
577	sys	sys_pipe2		2
578	sys	sys_inotify_init1	1
579	sys	sys_preadv		6	/* 4330 */
580	sys	sys_pwritev		6
581	sys	sys_rt_tgsigqueueinfo	4
582	sys	sys_perf_event_open	5
583	sys	sys_accept4		4
584	sys	sys_recvmmsg		5	/* 4335 */
585	sys	sys_fanotify_init	2
586	sys	sys_fanotify_mark	6
587	sys	sys_prlimit64		4
588	sys	sys_name_to_handle_at	5
589	sys	sys_open_by_handle_at	3	/* 4340 */
590	sys	sys_clock_adjtime	2
591	sys	sys_syncfs		1
592	sys	sys_sendmmsg		4
593	sys	sys_setns		2
594	sys	sys_process_vm_readv	6	/* 4345 */
595	sys	sys_process_vm_writev	6
596	.endm
597
598	/* We pre-compute the number of _instruction_ bytes needed to
599	   load or store the arguments 6-8. Negative values are ignored. */
600
601	.macro  sys function, nargs
602	PTR	\function
603	LONG	(\nargs << 2) - (5 << 2)
604	.endm
605
606	.align	3
607	.type	sys_call_table,@object
608EXPORT(sys_call_table)
609	syscalltable
610	.size	sys_call_table, . - sys_call_table
611