xref: /openbmc/linux/arch/mips/kernel/scall32-o32.S (revision a09d2831) 
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	negu	v0			# error
67	sw	v0, PT_R0(sp)		# set flag for syscall
68					# 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	li	a1, 0
92	jal	do_syscall_trace
93
94	move	t0, s0
95	RESTORE_STATIC
96	lw	a0, PT_R4(sp)		# Restore argument registers
97	lw	a1, PT_R5(sp)
98	lw	a2, PT_R6(sp)
99	lw	a3, PT_R7(sp)
100	jalr	t0
101
102	li	t0, -EMAXERRNO - 1	# error?
103	sltu	t0, t0, v0
104	sw	t0, PT_R7(sp)		# set error flag
105	beqz	t0, 1f
106
107	negu	v0			# error
108	sw	v0, PT_R0(sp)		# set flag for syscall
109					# restarting
1101:	sw	v0, PT_R2(sp)		# result
111
112	j	syscall_exit
113
114/* ------------------------------------------------------------------------ */
115
116	/*
117	 * More than four arguments.  Try to deal with it by copying the
118	 * stack arguments from the user stack to the kernel stack.
119	 * This Sucks (TM).
120	 */
121stackargs:
122	lw	t0, PT_R29(sp)		# get old user stack pointer
123
124	/*
125	 * We intentionally keep the kernel stack a little below the top of
126	 * userspace so we don't have to do a slower byte accurate check here.
127	 */
128	lw	t5, TI_ADDR_LIMIT($28)
129	addu	t4, t0, 32
130	and	t5, t4
131	bltz	t5, bad_stack		# -> sp is bad
132
133	/* Ok, copy the args from the luser stack to the kernel stack.
134	 * t3 is the precomputed number of instruction bytes needed to
135	 * load or store arguments 6-8.
136	 */
137
138	la	t1, 5f			# load up to 3 arguments
139	subu	t1, t3
1401:	lw	t5, 16(t0)		# argument #5 from usp
141	.set    push
142	.set    noreorder
143	.set	nomacro
144	jr	t1
145	 addiu	t1, 6f - 5f
146
1472:	lw	t8, 28(t0)		# argument #8 from usp
1483:	lw	t7, 24(t0)		# argument #7 from usp
1494:	lw	t6, 20(t0)		# argument #6 from usp
1505:	jr	t1
151	 sw	t5, 16(sp)		# argument #5 to ksp
152
153	sw	t8, 28(sp)		# argument #8 to ksp
154	sw	t7, 24(sp)		# argument #7 to ksp
155	sw	t6, 20(sp)		# argument #6 to ksp
1566:	j	stack_done		# go back
157	 nop
158	.set	pop
159
160	.section __ex_table,"a"
161	PTR	1b,bad_stack
162	PTR	2b,bad_stack
163	PTR	3b,bad_stack
164	PTR	4b,bad_stack
165	.previous
166
167	/*
168	 * The stackpointer for a call with more than 4 arguments is bad.
169	 * We probably should handle this case a bit more drastic.
170	 */
171bad_stack:
172	negu	v0				# error
173	sw	v0, PT_R0(sp)
174	sw	v0, PT_R2(sp)
175	li	t0, 1				# set error flag
176	sw	t0, PT_R7(sp)
177	j	o32_syscall_exit
178
179	/*
180	 * The system call does not exist in this kernel
181	 */
182illegal_syscall:
183	li	v0, ENOSYS			# error
184	sw	v0, PT_R2(sp)
185	li	t0, 1				# set error flag
186	sw	t0, PT_R7(sp)
187	j	o32_syscall_exit
188	END(handle_sys)
189
190	LEAF(sys_syscall)
191	subu	t0, a0, __NR_O32_Linux	# check syscall number
192	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
193	beqz	t0, einval		# do not recurse
194	sll	t1, t0, 3
195	beqz	v0, einval
196	lw	t2, sys_call_table(t1)		# syscall routine
197
198	/* Some syscalls like execve get their arguments from struct pt_regs
199	   and claim zero arguments in the syscall table. Thus we have to
200	   assume the worst case and shuffle around all potential arguments.
201	   If you want performance, don't use indirect syscalls. */
202
203	move	a0, a1				# shift argument registers
204	move	a1, a2
205	move	a2, a3
206	lw	a3, 16(sp)
207	lw	t4, 20(sp)
208	lw	t5, 24(sp)
209	lw	t6, 28(sp)
210	sw	t4, 16(sp)
211	sw	t5, 20(sp)
212	sw	t6, 24(sp)
213	sw	a0, PT_R4(sp)			# .. and push back a0 - a3, some
214	sw	a1, PT_R5(sp)			# syscalls expect them there
215	sw	a2, PT_R6(sp)
216	sw	a3, PT_R7(sp)
217	sw	a3, PT_R26(sp)			# update a3 for syscall restarting
218	jr	t2
219	/* Unreached */
220
221einval:	li	v0, -ENOSYS
222	jr	ra
223	END(sys_syscall)
224
225	.macro	fifty ptr, nargs, from=1, to=50
226	sys	\ptr		\nargs
227	.if	\to-\from
228	fifty	\ptr,\nargs,"(\from+1)",\to
229	.endif
230	.endm
231
232	.macro	mille ptr, nargs, from=1, to=20
233	fifty	\ptr,\nargs
234	.if	\to-\from
235	mille	\ptr,\nargs,"(\from+1)",\to
236	.endif
237	.endm
238
239	.macro	syscalltable
240	sys	sys_syscall		8	/* 4000 */
241	sys	sys_exit		1
242	sys	sys_fork		0
243	sys	sys_read		3
244	sys	sys_write		3
245	sys	sys_open		3	/* 4005 */
246	sys	sys_close		1
247	sys	sys_waitpid		3
248	sys	sys_creat		2
249	sys	sys_link		2
250	sys	sys_unlink		1	/* 4010 */
251	sys	sys_execve		0
252	sys	sys_chdir		1
253	sys	sys_time		1
254	sys	sys_mknod		3
255	sys	sys_chmod		2	/* 4015 */
256	sys	sys_lchown		3
257	sys	sys_ni_syscall		0
258	sys	sys_ni_syscall		0	/* was sys_stat */
259	sys	sys_lseek		3
260	sys	sys_getpid		0	/* 4020 */
261	sys	sys_mount		5
262	sys	sys_oldumount		1
263	sys	sys_setuid		1
264	sys	sys_getuid		0
265	sys	sys_stime		1	/* 4025 */
266	sys	sys_ptrace		4
267	sys	sys_alarm		1
268	sys	sys_ni_syscall		0	/* was sys_fstat */
269	sys	sys_pause		0
270	sys	sys_utime		2	/* 4030 */
271	sys	sys_ni_syscall		0
272	sys	sys_ni_syscall		0
273	sys	sys_access		2
274	sys	sys_nice		1
275	sys	sys_ni_syscall		0	/* 4035 */
276	sys	sys_sync		0
277	sys	sys_kill		2
278	sys	sys_rename		2
279	sys	sys_mkdir		2
280	sys	sys_rmdir		1	/* 4040 */
281	sys	sys_dup			1
282	sys	sysm_pipe		0
283	sys	sys_times		1
284	sys	sys_ni_syscall		0
285	sys	sys_brk			1	/* 4045 */
286	sys	sys_setgid		1
287	sys	sys_getgid		0
288	sys	sys_ni_syscall		0	/* was signal(2) */
289	sys	sys_geteuid		0
290	sys	sys_getegid		0	/* 4050 */
291	sys	sys_acct		1
292	sys	sys_umount		2
293	sys	sys_ni_syscall		0
294	sys	sys_ioctl		3
295	sys	sys_fcntl		3	/* 4055 */
296	sys	sys_ni_syscall		2
297	sys	sys_setpgid		2
298	sys	sys_ni_syscall		0
299	sys	sys_olduname		1
300	sys	sys_umask		1	/* 4060 */
301	sys	sys_chroot		1
302	sys	sys_ustat		2
303	sys	sys_dup2		2
304	sys	sys_getppid		0
305	sys	sys_getpgrp		0	/* 4065 */
306	sys	sys_setsid		0
307	sys	sys_sigaction		3
308	sys	sys_sgetmask		0
309	sys	sys_ssetmask		1
310	sys	sys_setreuid		2	/* 4070 */
311	sys	sys_setregid		2
312	sys	sys_sigsuspend		0
313	sys	sys_sigpending		1
314	sys	sys_sethostname		2
315	sys	sys_setrlimit		2	/* 4075 */
316	sys	sys_getrlimit		2
317	sys	sys_getrusage		2
318	sys	sys_gettimeofday	2
319	sys	sys_settimeofday	2
320	sys	sys_getgroups		2	/* 4080 */
321	sys	sys_setgroups		2
322	sys	sys_ni_syscall		0	/* old_select */
323	sys	sys_symlink		2
324	sys	sys_ni_syscall		0	/* was sys_lstat */
325	sys	sys_readlink		3	/* 4085 */
326	sys	sys_uselib		1
327	sys	sys_swapon		2
328	sys	sys_reboot		3
329	sys	sys_old_readdir		3
330	sys	sys_mips_mmap		6	/* 4090 */
331	sys	sys_munmap		2
332	sys	sys_truncate		2
333	sys	sys_ftruncate		2
334	sys	sys_fchmod		2
335	sys	sys_fchown		3	/* 4095 */
336	sys	sys_getpriority		2
337	sys	sys_setpriority		3
338	sys	sys_ni_syscall		0
339	sys	sys_statfs		2
340	sys	sys_fstatfs		2	/* 4100 */
341	sys	sys_ni_syscall		0	/* was ioperm(2) */
342	sys	sys_socketcall		2
343	sys	sys_syslog		3
344	sys	sys_setitimer		3
345	sys	sys_getitimer		2	/* 4105 */
346	sys	sys_newstat		2
347	sys	sys_newlstat		2
348	sys	sys_newfstat		2
349	sys	sys_uname		1
350	sys	sys_ni_syscall		0	/* 4110 was iopl(2) */
351	sys	sys_vhangup		0
352	sys	sys_ni_syscall		0	/* was sys_idle() */
353	sys	sys_ni_syscall		0	/* was sys_vm86 */
354	sys	sys_wait4		4
355	sys	sys_swapoff		1	/* 4115 */
356	sys	sys_sysinfo		1
357	sys	sys_ipc			6
358	sys	sys_fsync		1
359	sys	sys_sigreturn		0
360	sys	sys_clone		0	/* 4120 */
361	sys	sys_setdomainname	2
362	sys	sys_newuname		1
363	sys	sys_ni_syscall		0	/* sys_modify_ldt */
364	sys	sys_adjtimex		1
365	sys	sys_mprotect		3	/* 4125 */
366	sys	sys_sigprocmask		3
367	sys	sys_ni_syscall		0	/* was create_module */
368	sys	sys_init_module		5
369	sys	sys_delete_module	1
370	sys	sys_ni_syscall		0	/* 4130	was get_kernel_syms */
371	sys	sys_quotactl		4
372	sys	sys_getpgid		1
373	sys	sys_fchdir		1
374	sys	sys_bdflush		2
375	sys	sys_sysfs		3	/* 4135 */
376	sys	sys_personality		1
377	sys	sys_ni_syscall		0	/* for afs_syscall */
378	sys	sys_setfsuid		1
379	sys	sys_setfsgid		1
380	sys	sys_llseek		5	/* 4140 */
381	sys	sys_getdents		3
382	sys	sys_select		5
383	sys	sys_flock		2
384	sys	sys_msync		3
385	sys	sys_readv		3	/* 4145 */
386	sys	sys_writev		3
387	sys	sys_cacheflush		3
388	sys	sys_cachectl		3
389	sys	sys_sysmips		4
390	sys	sys_ni_syscall		0	/* 4150 */
391	sys	sys_getsid		1
392	sys	sys_fdatasync		1
393	sys	sys_sysctl		1
394	sys	sys_mlock		2
395	sys	sys_munlock		2	/* 4155 */
396	sys	sys_mlockall		1
397	sys	sys_munlockall		0
398	sys	sys_sched_setparam	2
399	sys	sys_sched_getparam	2
400	sys	sys_sched_setscheduler	3	/* 4160 */
401	sys	sys_sched_getscheduler	1
402	sys	sys_sched_yield		0
403	sys	sys_sched_get_priority_max 1
404	sys	sys_sched_get_priority_min 1
405	sys	sys_sched_rr_get_interval 2	/* 4165 */
406	sys	sys_nanosleep,		2
407	sys	sys_mremap,		5
408	sys	sys_accept		3
409	sys	sys_bind		3
410	sys	sys_connect		3	/* 4170 */
411	sys	sys_getpeername		3
412	sys	sys_getsockname		3
413	sys	sys_getsockopt		5
414	sys	sys_listen		2
415	sys	sys_recv		4	/* 4175 */
416	sys	sys_recvfrom		6
417	sys	sys_recvmsg		3
418	sys	sys_send		4
419	sys	sys_sendmsg		3
420	sys	sys_sendto		6	/* 4180 */
421	sys	sys_setsockopt		5
422	sys	sys_shutdown		2
423	sys	sys_socket		3
424	sys	sys_socketpair		4
425	sys	sys_setresuid		3	/* 4185 */
426	sys	sys_getresuid		3
427	sys	sys_ni_syscall		0	/* was sys_query_module */
428	sys	sys_poll		3
429	sys	sys_nfsservctl		3
430	sys	sys_setresgid		3	/* 4190 */
431	sys	sys_getresgid		3
432	sys	sys_prctl		5
433	sys	sys_rt_sigreturn	0
434	sys	sys_rt_sigaction	4
435	sys	sys_rt_sigprocmask	4	/* 4195 */
436	sys	sys_rt_sigpending	2
437	sys	sys_rt_sigtimedwait	4
438	sys	sys_rt_sigqueueinfo	3
439	sys	sys_rt_sigsuspend	0
440	sys	sys_pread64		6	/* 4200 */
441	sys	sys_pwrite64		6
442	sys	sys_chown		3
443	sys	sys_getcwd		2
444	sys	sys_capget		2
445	sys	sys_capset		2	/* 4205 */
446	sys	sys_sigaltstack		0
447	sys	sys_sendfile		4
448	sys	sys_ni_syscall		0
449	sys	sys_ni_syscall		0
450	sys	sys_mips_mmap2		6	/* 4210 */
451	sys	sys_truncate64		4
452	sys	sys_ftruncate64		4
453	sys	sys_stat64		2
454	sys	sys_lstat64		2
455	sys	sys_fstat64		2	/* 4215 */
456	sys	sys_pivot_root		2
457	sys	sys_mincore		3
458	sys	sys_madvise		3
459	sys	sys_getdents64		3
460	sys	sys_fcntl64		3	/* 4220 */
461	sys	sys_ni_syscall		0
462	sys	sys_gettid		0
463	sys	sys_readahead		5
464	sys	sys_setxattr		5
465	sys	sys_lsetxattr		5	/* 4225 */
466	sys	sys_fsetxattr		5
467	sys	sys_getxattr		4
468	sys	sys_lgetxattr		4
469	sys	sys_fgetxattr		4
470	sys	sys_listxattr		3	/* 4230 */
471	sys	sys_llistxattr		3
472	sys	sys_flistxattr		3
473	sys	sys_removexattr		2
474	sys	sys_lremovexattr	2
475	sys	sys_fremovexattr	2	/* 4235 */
476	sys	sys_tkill		2
477	sys	sys_sendfile64		5
478	sys	sys_futex		6
479#ifdef CONFIG_MIPS_MT_FPAFF
480	/*
481	 * For FPU affinity scheduling on MIPS MT processors, we need to
482	 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
483	 * in kernel/sched.c.  Considered only temporary we only support these
484	 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
485	 */
486	sys	mipsmt_sys_sched_setaffinity	3
487	sys	mipsmt_sys_sched_getaffinity	3
488#else
489	sys	sys_sched_setaffinity	3
490	sys	sys_sched_getaffinity	3	/* 4240 */
491#endif /* CONFIG_MIPS_MT_FPAFF */
492	sys	sys_io_setup		2
493	sys	sys_io_destroy		1
494	sys	sys_io_getevents	5
495	sys	sys_io_submit		3
496	sys	sys_io_cancel		3	/* 4245 */
497	sys	sys_exit_group		1
498	sys	sys_lookup_dcookie	4
499	sys	sys_epoll_create	1
500	sys	sys_epoll_ctl		4
501	sys	sys_epoll_wait		3	/* 4250 */
502	sys	sys_remap_file_pages	5
503	sys	sys_set_tid_address	1
504	sys	sys_restart_syscall	0
505	sys	sys_fadvise64_64	7
506	sys	sys_statfs64		3	/* 4255 */
507	sys	sys_fstatfs64		2
508	sys	sys_timer_create	3
509	sys	sys_timer_settime	4
510	sys	sys_timer_gettime	2
511	sys	sys_timer_getoverrun	1	/* 4260 */
512	sys	sys_timer_delete	1
513	sys	sys_clock_settime	2
514	sys	sys_clock_gettime	2
515	sys	sys_clock_getres	2
516	sys	sys_clock_nanosleep	4	/* 4265 */
517	sys	sys_tgkill		3
518	sys	sys_utimes		2
519	sys	sys_mbind		4
520	sys	sys_ni_syscall		0	/* sys_get_mempolicy */
521	sys	sys_ni_syscall		0	/* 4270 sys_set_mempolicy */
522	sys	sys_mq_open		4
523	sys	sys_mq_unlink		1
524	sys	sys_mq_timedsend	5
525	sys	sys_mq_timedreceive	5
526	sys	sys_mq_notify		2	/* 4275 */
527	sys	sys_mq_getsetattr	3
528	sys	sys_ni_syscall		0	/* sys_vserver */
529	sys	sys_waitid		5
530	sys	sys_ni_syscall		0	/* available, was setaltroot */
531	sys	sys_add_key		5	/* 4280 */
532	sys	sys_request_key		4
533	sys	sys_keyctl		5
534	sys	sys_set_thread_area	1
535	sys	sys_inotify_init	0
536	sys	sys_inotify_add_watch	3	/* 4285 */
537	sys	sys_inotify_rm_watch	2
538	sys	sys_migrate_pages	4
539	sys	sys_openat		4
540	sys	sys_mkdirat		3
541	sys	sys_mknodat		4	/* 4290 */
542	sys	sys_fchownat		5
543	sys	sys_futimesat		3
544	sys	sys_fstatat64		4
545	sys	sys_unlinkat		3
546	sys	sys_renameat		4	/* 4295 */
547	sys	sys_linkat		5
548	sys	sys_symlinkat		3
549	sys	sys_readlinkat		4
550	sys	sys_fchmodat		3
551	sys	sys_faccessat		3	/* 4300 */
552	sys	sys_pselect6		6
553	sys	sys_ppoll		5
554	sys	sys_unshare		1
555	sys	sys_splice		6
556	sys	sys_sync_file_range	7	/* 4305 */
557	sys	sys_tee			4
558	sys	sys_vmsplice		4
559	sys	sys_move_pages		6
560	sys	sys_set_robust_list	2
561	sys	sys_get_robust_list	3	/* 4310 */
562	sys	sys_kexec_load		4
563	sys	sys_getcpu		3
564	sys	sys_epoll_pwait		6
565	sys	sys_ioprio_set		3
566	sys	sys_ioprio_get		2	/* 4315 */
567	sys	sys_utimensat		4
568	sys	sys_signalfd		3
569	sys	sys_ni_syscall		0
570	sys	sys_eventfd		1
571	sys	sys_fallocate		6	/* 4320 */
572	sys	sys_timerfd_create	2
573	sys	sys_timerfd_gettime	2
574	sys	sys_timerfd_settime	4
575	sys	sys_signalfd4		4
576	sys	sys_eventfd2		2	/* 4325 */
577	sys	sys_epoll_create1	1
578	sys	sys_dup3		3
579	sys	sys_pipe2		2
580	sys	sys_inotify_init1	1
581	sys	sys_preadv		6	/* 4330 */
582	sys	sys_pwritev		6
583	sys	sys_rt_tgsigqueueinfo	4
584	sys	sys_perf_event_open	5
585	sys	sys_accept4		4
586	sys     sys_recvmmsg            5
587	.endm
588
589	/* We pre-compute the number of _instruction_ bytes needed to
590	   load or store the arguments 6-8. Negative values are ignored. */
591
592	.macro  sys function, nargs
593	PTR	\function
594	LONG	(\nargs << 2) - (5 << 2)
595	.endm
596
597	.align	3
598	.type	sys_call_table,@object
599EXPORT(sys_call_table)
600	syscalltable
601	.size	sys_call_table, . - sys_call_table
602