xref: /openbmc/linux/arch/mips/kernel/scall32-o32.S (revision 565d76cb) 
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	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	lw	t1, PT_R2(sp)		# syscall number
108	negu	v0			# error
109	sw	t1, PT_R0(sp)		# save it for syscall 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	li	v0, EFAULT
173	sw	v0, PT_R2(sp)
174	li	t0, 1				# set error flag
175	sw	t0, PT_R7(sp)
176	j	o32_syscall_exit
177
178	/*
179	 * The system call does not exist in this kernel
180	 */
181illegal_syscall:
182	li	v0, ENOSYS			# error
183	sw	v0, PT_R2(sp)
184	li	t0, 1				# set error flag
185	sw	t0, PT_R7(sp)
186	j	o32_syscall_exit
187	END(handle_sys)
188
189	LEAF(sys_syscall)
190	subu	t0, a0, __NR_O32_Linux	# check syscall number
191	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
192	beqz	t0, einval		# do not recurse
193	sll	t1, t0, 3
194	beqz	v0, einval
195	lw	t2, sys_call_table(t1)		# syscall routine
196
197	/* Some syscalls like execve get their arguments from struct pt_regs
198	   and claim zero arguments in the syscall table. Thus we have to
199	   assume the worst case and shuffle around all potential arguments.
200	   If you want performance, don't use indirect syscalls. */
201
202	move	a0, a1				# shift argument registers
203	move	a1, a2
204	move	a2, a3
205	lw	a3, 16(sp)
206	lw	t4, 20(sp)
207	lw	t5, 24(sp)
208	lw	t6, 28(sp)
209	sw	t4, 16(sp)
210	sw	t5, 20(sp)
211	sw	t6, 24(sp)
212	sw	a0, PT_R4(sp)			# .. and push back a0 - a3, some
213	sw	a1, PT_R5(sp)			# syscalls expect them there
214	sw	a2, PT_R6(sp)
215	sw	a3, PT_R7(sp)
216	sw	a3, PT_R26(sp)			# update a3 for syscall restarting
217	jr	t2
218	/* Unreached */
219
220einval:	li	v0, -ENOSYS
221	jr	ra
222	END(sys_syscall)
223
224	.macro	fifty ptr, nargs, from=1, to=50
225	sys	\ptr		\nargs
226	.if	\to-\from
227	fifty	\ptr,\nargs,"(\from+1)",\to
228	.endif
229	.endm
230
231	.macro	mille ptr, nargs, from=1, to=20
232	fifty	\ptr,\nargs
233	.if	\to-\from
234	mille	\ptr,\nargs,"(\from+1)",\to
235	.endif
236	.endm
237
238	.macro	syscalltable
239	sys	sys_syscall		8	/* 4000 */
240	sys	sys_exit		1
241	sys	sys_fork		0
242	sys	sys_read		3
243	sys	sys_write		3
244	sys	sys_open		3	/* 4005 */
245	sys	sys_close		1
246	sys	sys_waitpid		3
247	sys	sys_creat		2
248	sys	sys_link		2
249	sys	sys_unlink		1	/* 4010 */
250	sys	sys_execve		0
251	sys	sys_chdir		1
252	sys	sys_time		1
253	sys	sys_mknod		3
254	sys	sys_chmod		2	/* 4015 */
255	sys	sys_lchown		3
256	sys	sys_ni_syscall		0
257	sys	sys_ni_syscall		0	/* was sys_stat */
258	sys	sys_lseek		3
259	sys	sys_getpid		0	/* 4020 */
260	sys	sys_mount		5
261	sys	sys_oldumount		1
262	sys	sys_setuid		1
263	sys	sys_getuid		0
264	sys	sys_stime		1	/* 4025 */
265	sys	sys_ptrace		4
266	sys	sys_alarm		1
267	sys	sys_ni_syscall		0	/* was sys_fstat */
268	sys	sys_pause		0
269	sys	sys_utime		2	/* 4030 */
270	sys	sys_ni_syscall		0
271	sys	sys_ni_syscall		0
272	sys	sys_access		2
273	sys	sys_nice		1
274	sys	sys_ni_syscall		0	/* 4035 */
275	sys	sys_sync		0
276	sys	sys_kill		2
277	sys	sys_rename		2
278	sys	sys_mkdir		2
279	sys	sys_rmdir		1	/* 4040 */
280	sys	sys_dup			1
281	sys	sysm_pipe		0
282	sys	sys_times		1
283	sys	sys_ni_syscall		0
284	sys	sys_brk			1	/* 4045 */
285	sys	sys_setgid		1
286	sys	sys_getgid		0
287	sys	sys_ni_syscall		0	/* was signal(2) */
288	sys	sys_geteuid		0
289	sys	sys_getegid		0	/* 4050 */
290	sys	sys_acct		1
291	sys	sys_umount		2
292	sys	sys_ni_syscall		0
293	sys	sys_ioctl		3
294	sys	sys_fcntl		3	/* 4055 */
295	sys	sys_ni_syscall		2
296	sys	sys_setpgid		2
297	sys	sys_ni_syscall		0
298	sys	sys_olduname		1
299	sys	sys_umask		1	/* 4060 */
300	sys	sys_chroot		1
301	sys	sys_ustat		2
302	sys	sys_dup2		2
303	sys	sys_getppid		0
304	sys	sys_getpgrp		0	/* 4065 */
305	sys	sys_setsid		0
306	sys	sys_sigaction		3
307	sys	sys_sgetmask		0
308	sys	sys_ssetmask		1
309	sys	sys_setreuid		2	/* 4070 */
310	sys	sys_setregid		2
311	sys	sys_sigsuspend		0
312	sys	sys_sigpending		1
313	sys	sys_sethostname		2
314	sys	sys_setrlimit		2	/* 4075 */
315	sys	sys_getrlimit		2
316	sys	sys_getrusage		2
317	sys	sys_gettimeofday	2
318	sys	sys_settimeofday	2
319	sys	sys_getgroups		2	/* 4080 */
320	sys	sys_setgroups		2
321	sys	sys_ni_syscall		0	/* old_select */
322	sys	sys_symlink		2
323	sys	sys_ni_syscall		0	/* was sys_lstat */
324	sys	sys_readlink		3	/* 4085 */
325	sys	sys_uselib		1
326	sys	sys_swapon		2
327	sys	sys_reboot		3
328	sys	sys_old_readdir		3
329	sys	sys_mips_mmap		6	/* 4090 */
330	sys	sys_munmap		2
331	sys	sys_truncate		2
332	sys	sys_ftruncate		2
333	sys	sys_fchmod		2
334	sys	sys_fchown		3	/* 4095 */
335	sys	sys_getpriority		2
336	sys	sys_setpriority		3
337	sys	sys_ni_syscall		0
338	sys	sys_statfs		2
339	sys	sys_fstatfs		2	/* 4100 */
340	sys	sys_ni_syscall		0	/* was ioperm(2) */
341	sys	sys_socketcall		2
342	sys	sys_syslog		3
343	sys	sys_setitimer		3
344	sys	sys_getitimer		2	/* 4105 */
345	sys	sys_newstat		2
346	sys	sys_newlstat		2
347	sys	sys_newfstat		2
348	sys	sys_uname		1
349	sys	sys_ni_syscall		0	/* 4110 was iopl(2) */
350	sys	sys_vhangup		0
351	sys	sys_ni_syscall		0	/* was sys_idle() */
352	sys	sys_ni_syscall		0	/* was sys_vm86 */
353	sys	sys_wait4		4
354	sys	sys_swapoff		1	/* 4115 */
355	sys	sys_sysinfo		1
356	sys	sys_ipc			6
357	sys	sys_fsync		1
358	sys	sys_sigreturn		0
359	sys	sys_clone		0	/* 4120 */
360	sys	sys_setdomainname	2
361	sys	sys_newuname		1
362	sys	sys_ni_syscall		0	/* sys_modify_ldt */
363	sys	sys_adjtimex		1
364	sys	sys_mprotect		3	/* 4125 */
365	sys	sys_sigprocmask		3
366	sys	sys_ni_syscall		0	/* was create_module */
367	sys	sys_init_module		5
368	sys	sys_delete_module	1
369	sys	sys_ni_syscall		0	/* 4130	was get_kernel_syms */
370	sys	sys_quotactl		4
371	sys	sys_getpgid		1
372	sys	sys_fchdir		1
373	sys	sys_bdflush		2
374	sys	sys_sysfs		3	/* 4135 */
375	sys	sys_personality		1
376	sys	sys_ni_syscall		0	/* for afs_syscall */
377	sys	sys_setfsuid		1
378	sys	sys_setfsgid		1
379	sys	sys_llseek		5	/* 4140 */
380	sys	sys_getdents		3
381	sys	sys_select		5
382	sys	sys_flock		2
383	sys	sys_msync		3
384	sys	sys_readv		3	/* 4145 */
385	sys	sys_writev		3
386	sys	sys_cacheflush		3
387	sys	sys_cachectl		3
388	sys	sys_sysmips		4
389	sys	sys_ni_syscall		0	/* 4150 */
390	sys	sys_getsid		1
391	sys	sys_fdatasync		1
392	sys	sys_sysctl		1
393	sys	sys_mlock		2
394	sys	sys_munlock		2	/* 4155 */
395	sys	sys_mlockall		1
396	sys	sys_munlockall		0
397	sys	sys_sched_setparam	2
398	sys	sys_sched_getparam	2
399	sys	sys_sched_setscheduler	3	/* 4160 */
400	sys	sys_sched_getscheduler	1
401	sys	sys_sched_yield		0
402	sys	sys_sched_get_priority_max 1
403	sys	sys_sched_get_priority_min 1
404	sys	sys_sched_rr_get_interval 2	/* 4165 */
405	sys	sys_nanosleep,		2
406	sys	sys_mremap,		5
407	sys	sys_accept		3
408	sys	sys_bind		3
409	sys	sys_connect		3	/* 4170 */
410	sys	sys_getpeername		3
411	sys	sys_getsockname		3
412	sys	sys_getsockopt		5
413	sys	sys_listen		2
414	sys	sys_recv		4	/* 4175 */
415	sys	sys_recvfrom		6
416	sys	sys_recvmsg		3
417	sys	sys_send		4
418	sys	sys_sendmsg		3
419	sys	sys_sendto		6	/* 4180 */
420	sys	sys_setsockopt		5
421	sys	sys_shutdown		2
422	sys	sys_socket		3
423	sys	sys_socketpair		4
424	sys	sys_setresuid		3	/* 4185 */
425	sys	sys_getresuid		3
426	sys	sys_ni_syscall		0	/* was sys_query_module */
427	sys	sys_poll		3
428	sys	sys_nfsservctl		3
429	sys	sys_setresgid		3	/* 4190 */
430	sys	sys_getresgid		3
431	sys	sys_prctl		5
432	sys	sys_rt_sigreturn	0
433	sys	sys_rt_sigaction	4
434	sys	sys_rt_sigprocmask	4	/* 4195 */
435	sys	sys_rt_sigpending	2
436	sys	sys_rt_sigtimedwait	4
437	sys	sys_rt_sigqueueinfo	3
438	sys	sys_rt_sigsuspend	0
439	sys	sys_pread64		6	/* 4200 */
440	sys	sys_pwrite64		6
441	sys	sys_chown		3
442	sys	sys_getcwd		2
443	sys	sys_capget		2
444	sys	sys_capset		2	/* 4205 */
445	sys	sys_sigaltstack		0
446	sys	sys_sendfile		4
447	sys	sys_ni_syscall		0
448	sys	sys_ni_syscall		0
449	sys	sys_mips_mmap2		6	/* 4210 */
450	sys	sys_truncate64		4
451	sys	sys_ftruncate64		4
452	sys	sys_stat64		2
453	sys	sys_lstat64		2
454	sys	sys_fstat64		2	/* 4215 */
455	sys	sys_pivot_root		2
456	sys	sys_mincore		3
457	sys	sys_madvise		3
458	sys	sys_getdents64		3
459	sys	sys_fcntl64		3	/* 4220 */
460	sys	sys_ni_syscall		0
461	sys	sys_gettid		0
462	sys	sys_readahead		5
463	sys	sys_setxattr		5
464	sys	sys_lsetxattr		5	/* 4225 */
465	sys	sys_fsetxattr		5
466	sys	sys_getxattr		4
467	sys	sys_lgetxattr		4
468	sys	sys_fgetxattr		4
469	sys	sys_listxattr		3	/* 4230 */
470	sys	sys_llistxattr		3
471	sys	sys_flistxattr		3
472	sys	sys_removexattr		2
473	sys	sys_lremovexattr	2
474	sys	sys_fremovexattr	2	/* 4235 */
475	sys	sys_tkill		2
476	sys	sys_sendfile64		5
477	sys	sys_futex		6
478#ifdef CONFIG_MIPS_MT_FPAFF
479	/*
480	 * For FPU affinity scheduling on MIPS MT processors, we need to
481	 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
482	 * in kernel/sched.c.  Considered only temporary we only support these
483	 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
484	 */
485	sys	mipsmt_sys_sched_setaffinity	3
486	sys	mipsmt_sys_sched_getaffinity	3
487#else
488	sys	sys_sched_setaffinity	3
489	sys	sys_sched_getaffinity	3	/* 4240 */
490#endif /* CONFIG_MIPS_MT_FPAFF */
491	sys	sys_io_setup		2
492	sys	sys_io_destroy		1
493	sys	sys_io_getevents	5
494	sys	sys_io_submit		3
495	sys	sys_io_cancel		3	/* 4245 */
496	sys	sys_exit_group		1
497	sys	sys_lookup_dcookie	4
498	sys	sys_epoll_create	1
499	sys	sys_epoll_ctl		4
500	sys	sys_epoll_wait		3	/* 4250 */
501	sys	sys_remap_file_pages	5
502	sys	sys_set_tid_address	1
503	sys	sys_restart_syscall	0
504	sys	sys_fadvise64_64	7
505	sys	sys_statfs64		3	/* 4255 */
506	sys	sys_fstatfs64		2
507	sys	sys_timer_create	3
508	sys	sys_timer_settime	4
509	sys	sys_timer_gettime	2
510	sys	sys_timer_getoverrun	1	/* 4260 */
511	sys	sys_timer_delete	1
512	sys	sys_clock_settime	2
513	sys	sys_clock_gettime	2
514	sys	sys_clock_getres	2
515	sys	sys_clock_nanosleep	4	/* 4265 */
516	sys	sys_tgkill		3
517	sys	sys_utimes		2
518	sys	sys_mbind		4
519	sys	sys_ni_syscall		0	/* sys_get_mempolicy */
520	sys	sys_ni_syscall		0	/* 4270 sys_set_mempolicy */
521	sys	sys_mq_open		4
522	sys	sys_mq_unlink		1
523	sys	sys_mq_timedsend	5
524	sys	sys_mq_timedreceive	5
525	sys	sys_mq_notify		2	/* 4275 */
526	sys	sys_mq_getsetattr	3
527	sys	sys_ni_syscall		0	/* sys_vserver */
528	sys	sys_waitid		5
529	sys	sys_ni_syscall		0	/* available, was setaltroot */
530	sys	sys_add_key		5	/* 4280 */
531	sys	sys_request_key		4
532	sys	sys_keyctl		5
533	sys	sys_set_thread_area	1
534	sys	sys_inotify_init	0
535	sys	sys_inotify_add_watch	3	/* 4285 */
536	sys	sys_inotify_rm_watch	2
537	sys	sys_migrate_pages	4
538	sys	sys_openat		4
539	sys	sys_mkdirat		3
540	sys	sys_mknodat		4	/* 4290 */
541	sys	sys_fchownat		5
542	sys	sys_futimesat		3
543	sys	sys_fstatat64		4
544	sys	sys_unlinkat		3
545	sys	sys_renameat		4	/* 4295 */
546	sys	sys_linkat		5
547	sys	sys_symlinkat		3
548	sys	sys_readlinkat		4
549	sys	sys_fchmodat		3
550	sys	sys_faccessat		3	/* 4300 */
551	sys	sys_pselect6		6
552	sys	sys_ppoll		5
553	sys	sys_unshare		1
554	sys	sys_splice		6
555	sys	sys_sync_file_range	7	/* 4305 */
556	sys	sys_tee			4
557	sys	sys_vmsplice		4
558	sys	sys_move_pages		6
559	sys	sys_set_robust_list	2
560	sys	sys_get_robust_list	3	/* 4310 */
561	sys	sys_kexec_load		4
562	sys	sys_getcpu		3
563	sys	sys_epoll_pwait		6
564	sys	sys_ioprio_set		3
565	sys	sys_ioprio_get		2	/* 4315 */
566	sys	sys_utimensat		4
567	sys	sys_signalfd		3
568	sys	sys_ni_syscall		0
569	sys	sys_eventfd		1
570	sys	sys_fallocate		6	/* 4320 */
571	sys	sys_timerfd_create	2
572	sys	sys_timerfd_gettime	2
573	sys	sys_timerfd_settime	4
574	sys	sys_signalfd4		4
575	sys	sys_eventfd2		2	/* 4325 */
576	sys	sys_epoll_create1	1
577	sys	sys_dup3		3
578	sys	sys_pipe2		2
579	sys	sys_inotify_init1	1
580	sys	sys_preadv		6	/* 4330 */
581	sys	sys_pwritev		6
582	sys	sys_rt_tgsigqueueinfo	4
583	sys	sys_perf_event_open	5
584	sys	sys_accept4		4
585	sys	sys_recvmmsg		5	/* 4335 */
586	sys	sys_fanotify_init	2
587	sys	sys_fanotify_mark	6
588	sys	sys_prlimit64		4
589	.endm
590
591	/* We pre-compute the number of _instruction_ bytes needed to
592	   load or store the arguments 6-8. Negative values are ignored. */
593
594	.macro  sys function, nargs
595	PTR	\function
596	LONG	(\nargs << 2) - (5 << 2)
597	.endm
598
599	.align	3
600	.type	sys_call_table,@object
601EXPORT(sys_call_table)
602	syscalltable
603	.size	sys_call_table, . - sys_call_table
604