xref: /openbmc/linux/arch/mips/kernel/scall32-o32.S (revision 0d456bad) 
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	j	syscall_exit_partial
73
74/* ------------------------------------------------------------------------ */
75
76syscall_trace_entry:
77	SAVE_STATIC
78	move	s0, t2
79	move	a0, sp
80	jal	syscall_trace_enter
81
82	move	t0, s0
83	RESTORE_STATIC
84	lw	a0, PT_R4(sp)		# Restore argument registers
85	lw	a1, PT_R5(sp)
86	lw	a2, PT_R6(sp)
87	lw	a3, PT_R7(sp)
88	jalr	t0
89
90	li	t0, -EMAXERRNO - 1	# error?
91	sltu	t0, t0, v0
92	sw	t0, PT_R7(sp)		# set error flag
93	beqz	t0, 1f
94
95	lw	t1, PT_R2(sp)		# syscall number
96	negu	v0			# error
97	sw	t1, PT_R0(sp)		# save it for syscall restarting
981:	sw	v0, PT_R2(sp)		# result
99
100	j	syscall_exit
101
102/* ------------------------------------------------------------------------ */
103
104	/*
105	 * More than four arguments.  Try to deal with it by copying the
106	 * stack arguments from the user stack to the kernel stack.
107	 * This Sucks (TM).
108	 */
109stackargs:
110	lw	t0, PT_R29(sp)		# get old user stack pointer
111
112	/*
113	 * We intentionally keep the kernel stack a little below the top of
114	 * userspace so we don't have to do a slower byte accurate check here.
115	 */
116	lw	t5, TI_ADDR_LIMIT($28)
117	addu	t4, t0, 32
118	and	t5, t4
119	bltz	t5, bad_stack		# -> sp is bad
120
121	/* Ok, copy the args from the luser stack to the kernel stack.
122	 * t3 is the precomputed number of instruction bytes needed to
123	 * load or store arguments 6-8.
124	 */
125
126	la	t1, 5f			# load up to 3 arguments
127	subu	t1, t3
1281:	lw	t5, 16(t0)		# argument #5 from usp
129	.set    push
130	.set    noreorder
131	.set	nomacro
132	jr	t1
133	 addiu	t1, 6f - 5f
134
1352:	lw	t8, 28(t0)		# argument #8 from usp
1363:	lw	t7, 24(t0)		# argument #7 from usp
1374:	lw	t6, 20(t0)		# argument #6 from usp
1385:	jr	t1
139	 sw	t5, 16(sp)		# argument #5 to ksp
140
141	sw	t8, 28(sp)		# argument #8 to ksp
142	sw	t7, 24(sp)		# argument #7 to ksp
143	sw	t6, 20(sp)		# argument #6 to ksp
1446:	j	stack_done		# go back
145	 nop
146	.set	pop
147
148	.section __ex_table,"a"
149	PTR	1b,bad_stack
150	PTR	2b,bad_stack
151	PTR	3b,bad_stack
152	PTR	4b,bad_stack
153	.previous
154
155	/*
156	 * The stackpointer for a call with more than 4 arguments is bad.
157	 * We probably should handle this case a bit more drastic.
158	 */
159bad_stack:
160	li	v0, EFAULT
161	sw	v0, PT_R2(sp)
162	li	t0, 1				# set error flag
163	sw	t0, PT_R7(sp)
164	j	o32_syscall_exit
165
166	/*
167	 * The system call does not exist in this kernel
168	 */
169illegal_syscall:
170	li	v0, ENOSYS			# error
171	sw	v0, PT_R2(sp)
172	li	t0, 1				# set error flag
173	sw	t0, PT_R7(sp)
174	j	o32_syscall_exit
175	END(handle_sys)
176
177	LEAF(sys_syscall)
178	subu	t0, a0, __NR_O32_Linux	# check syscall number
179	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
180	beqz	t0, einval		# do not recurse
181	sll	t1, t0, 3
182	beqz	v0, einval
183	lw	t2, sys_call_table(t1)		# syscall routine
184
185	/* Some syscalls like execve get their arguments from struct pt_regs
186	   and claim zero arguments in the syscall table. Thus we have to
187	   assume the worst case and shuffle around all potential arguments.
188	   If you want performance, don't use indirect syscalls. */
189
190	move	a0, a1				# shift argument registers
191	move	a1, a2
192	move	a2, a3
193	lw	a3, 16(sp)
194	lw	t4, 20(sp)
195	lw	t5, 24(sp)
196	lw	t6, 28(sp)
197	sw	t4, 16(sp)
198	sw	t5, 20(sp)
199	sw	t6, 24(sp)
200	sw	a0, PT_R4(sp)			# .. and push back a0 - a3, some
201	sw	a1, PT_R5(sp)			# syscalls expect them there
202	sw	a2, PT_R6(sp)
203	sw	a3, PT_R7(sp)
204	sw	a3, PT_R26(sp)			# update a3 for syscall restarting
205	jr	t2
206	/* Unreached */
207
208einval:	li	v0, -ENOSYS
209	jr	ra
210	END(sys_syscall)
211
212	.macro	fifty ptr, nargs, from=1, to=50
213	sys	\ptr		\nargs
214	.if	\to-\from
215	fifty	\ptr,\nargs,"(\from+1)",\to
216	.endif
217	.endm
218
219	.macro	mille ptr, nargs, from=1, to=20
220	fifty	\ptr,\nargs
221	.if	\to-\from
222	mille	\ptr,\nargs,"(\from+1)",\to
223	.endif
224	.endm
225
226	.macro	syscalltable
227	sys	sys_syscall		8	/* 4000 */
228	sys	sys_exit		1
229	sys	sys_fork		0
230	sys	sys_read		3
231	sys	sys_write		3
232	sys	sys_open		3	/* 4005 */
233	sys	sys_close		1
234	sys	sys_waitpid		3
235	sys	sys_creat		2
236	sys	sys_link		2
237	sys	sys_unlink		1	/* 4010 */
238	sys	sys_execve		0
239	sys	sys_chdir		1
240	sys	sys_time		1
241	sys	sys_mknod		3
242	sys	sys_chmod		2	/* 4015 */
243	sys	sys_lchown		3
244	sys	sys_ni_syscall		0
245	sys	sys_ni_syscall		0	/* was sys_stat */
246	sys	sys_lseek		3
247	sys	sys_getpid		0	/* 4020 */
248	sys	sys_mount		5
249	sys	sys_oldumount		1
250	sys	sys_setuid		1
251	sys	sys_getuid		0
252	sys	sys_stime		1	/* 4025 */
253	sys	sys_ptrace		4
254	sys	sys_alarm		1
255	sys	sys_ni_syscall		0	/* was sys_fstat */
256	sys	sys_pause		0
257	sys	sys_utime		2	/* 4030 */
258	sys	sys_ni_syscall		0
259	sys	sys_ni_syscall		0
260	sys	sys_access		2
261	sys	sys_nice		1
262	sys	sys_ni_syscall		0	/* 4035 */
263	sys	sys_sync		0
264	sys	sys_kill		2
265	sys	sys_rename		2
266	sys	sys_mkdir		2
267	sys	sys_rmdir		1	/* 4040 */
268	sys	sys_dup			1
269	sys	sysm_pipe		0
270	sys	sys_times		1
271	sys	sys_ni_syscall		0
272	sys	sys_brk			1	/* 4045 */
273	sys	sys_setgid		1
274	sys	sys_getgid		0
275	sys	sys_ni_syscall		0	/* was signal(2) */
276	sys	sys_geteuid		0
277	sys	sys_getegid		0	/* 4050 */
278	sys	sys_acct		1
279	sys	sys_umount		2
280	sys	sys_ni_syscall		0
281	sys	sys_ioctl		3
282	sys	sys_fcntl		3	/* 4055 */
283	sys	sys_ni_syscall		2
284	sys	sys_setpgid		2
285	sys	sys_ni_syscall		0
286	sys	sys_olduname		1
287	sys	sys_umask		1	/* 4060 */
288	sys	sys_chroot		1
289	sys	sys_ustat		2
290	sys	sys_dup2		2
291	sys	sys_getppid		0
292	sys	sys_getpgrp		0	/* 4065 */
293	sys	sys_setsid		0
294	sys	sys_sigaction		3
295	sys	sys_sgetmask		0
296	sys	sys_ssetmask		1
297	sys	sys_setreuid		2	/* 4070 */
298	sys	sys_setregid		2
299	sys	sys_sigsuspend		0
300	sys	sys_sigpending		1
301	sys	sys_sethostname		2
302	sys	sys_setrlimit		2	/* 4075 */
303	sys	sys_getrlimit		2
304	sys	sys_getrusage		2
305	sys	sys_gettimeofday	2
306	sys	sys_settimeofday	2
307	sys	sys_getgroups		2	/* 4080 */
308	sys	sys_setgroups		2
309	sys	sys_ni_syscall		0	/* old_select */
310	sys	sys_symlink		2
311	sys	sys_ni_syscall		0	/* was sys_lstat */
312	sys	sys_readlink		3	/* 4085 */
313	sys	sys_uselib		1
314	sys	sys_swapon		2
315	sys	sys_reboot		3
316	sys	sys_old_readdir		3
317	sys	sys_mips_mmap		6	/* 4090 */
318	sys	sys_munmap		2
319	sys	sys_truncate		2
320	sys	sys_ftruncate		2
321	sys	sys_fchmod		2
322	sys	sys_fchown		3	/* 4095 */
323	sys	sys_getpriority		2
324	sys	sys_setpriority		3
325	sys	sys_ni_syscall		0
326	sys	sys_statfs		2
327	sys	sys_fstatfs		2	/* 4100 */
328	sys	sys_ni_syscall		0	/* was ioperm(2) */
329	sys	sys_socketcall		2
330	sys	sys_syslog		3
331	sys	sys_setitimer		3
332	sys	sys_getitimer		2	/* 4105 */
333	sys	sys_newstat		2
334	sys	sys_newlstat		2
335	sys	sys_newfstat		2
336	sys	sys_uname		1
337	sys	sys_ni_syscall		0	/* 4110 was iopl(2) */
338	sys	sys_vhangup		0
339	sys	sys_ni_syscall		0	/* was sys_idle() */
340	sys	sys_ni_syscall		0	/* was sys_vm86 */
341	sys	sys_wait4		4
342	sys	sys_swapoff		1	/* 4115 */
343	sys	sys_sysinfo		1
344	sys	sys_ipc			6
345	sys	sys_fsync		1
346	sys	sys_sigreturn		0
347	sys	sys_clone		0	/* 4120 */
348	sys	sys_setdomainname	2
349	sys	sys_newuname		1
350	sys	sys_ni_syscall		0	/* sys_modify_ldt */
351	sys	sys_adjtimex		1
352	sys	sys_mprotect		3	/* 4125 */
353	sys	sys_sigprocmask		3
354	sys	sys_ni_syscall		0	/* was create_module */
355	sys	sys_init_module		5
356	sys	sys_delete_module	1
357	sys	sys_ni_syscall		0	/* 4130	was get_kernel_syms */
358	sys	sys_quotactl		4
359	sys	sys_getpgid		1
360	sys	sys_fchdir		1
361	sys	sys_bdflush		2
362	sys	sys_sysfs		3	/* 4135 */
363	sys	sys_personality		1
364	sys	sys_ni_syscall		0	/* for afs_syscall */
365	sys	sys_setfsuid		1
366	sys	sys_setfsgid		1
367	sys	sys_llseek		5	/* 4140 */
368	sys	sys_getdents		3
369	sys	sys_select		5
370	sys	sys_flock		2
371	sys	sys_msync		3
372	sys	sys_readv		3	/* 4145 */
373	sys	sys_writev		3
374	sys	sys_cacheflush		3
375	sys	sys_cachectl		3
376	sys	sys_sysmips		4
377	sys	sys_ni_syscall		0	/* 4150 */
378	sys	sys_getsid		1
379	sys	sys_fdatasync		1
380	sys	sys_sysctl		1
381	sys	sys_mlock		2
382	sys	sys_munlock		2	/* 4155 */
383	sys	sys_mlockall		1
384	sys	sys_munlockall		0
385	sys	sys_sched_setparam	2
386	sys	sys_sched_getparam	2
387	sys	sys_sched_setscheduler	3	/* 4160 */
388	sys	sys_sched_getscheduler	1
389	sys	sys_sched_yield		0
390	sys	sys_sched_get_priority_max 1
391	sys	sys_sched_get_priority_min 1
392	sys	sys_sched_rr_get_interval 2	/* 4165 */
393	sys	sys_nanosleep,		2
394	sys	sys_mremap,		5
395	sys	sys_accept		3
396	sys	sys_bind		3
397	sys	sys_connect		3	/* 4170 */
398	sys	sys_getpeername		3
399	sys	sys_getsockname		3
400	sys	sys_getsockopt		5
401	sys	sys_listen		2
402	sys	sys_recv		4	/* 4175 */
403	sys	sys_recvfrom		6
404	sys	sys_recvmsg		3
405	sys	sys_send		4
406	sys	sys_sendmsg		3
407	sys	sys_sendto		6	/* 4180 */
408	sys	sys_setsockopt		5
409	sys	sys_shutdown		2
410	sys	sys_socket		3
411	sys	sys_socketpair		4
412	sys	sys_setresuid		3	/* 4185 */
413	sys	sys_getresuid		3
414	sys	sys_ni_syscall		0	/* was sys_query_module */
415	sys	sys_poll		3
416	sys	sys_ni_syscall		0	/* was nfsservctl */
417	sys	sys_setresgid		3	/* 4190 */
418	sys	sys_getresgid		3
419	sys	sys_prctl		5
420	sys	sys_rt_sigreturn	0
421	sys	sys_rt_sigaction	4
422	sys	sys_rt_sigprocmask	4	/* 4195 */
423	sys	sys_rt_sigpending	2
424	sys	sys_rt_sigtimedwait	4
425	sys	sys_rt_sigqueueinfo	3
426	sys	sys_rt_sigsuspend	0
427	sys	sys_pread64		6	/* 4200 */
428	sys	sys_pwrite64		6
429	sys	sys_chown		3
430	sys	sys_getcwd		2
431	sys	sys_capget		2
432	sys	sys_capset		2	/* 4205 */
433	sys	sys_sigaltstack		0
434	sys	sys_sendfile		4
435	sys	sys_ni_syscall		0
436	sys	sys_ni_syscall		0
437	sys	sys_mips_mmap2		6	/* 4210 */
438	sys	sys_truncate64		4
439	sys	sys_ftruncate64		4
440	sys	sys_stat64		2
441	sys	sys_lstat64		2
442	sys	sys_fstat64		2	/* 4215 */
443	sys	sys_pivot_root		2
444	sys	sys_mincore		3
445	sys	sys_madvise		3
446	sys	sys_getdents64		3
447	sys	sys_fcntl64		3	/* 4220 */
448	sys	sys_ni_syscall		0
449	sys	sys_gettid		0
450	sys	sys_readahead		5
451	sys	sys_setxattr		5
452	sys	sys_lsetxattr		5	/* 4225 */
453	sys	sys_fsetxattr		5
454	sys	sys_getxattr		4
455	sys	sys_lgetxattr		4
456	sys	sys_fgetxattr		4
457	sys	sys_listxattr		3	/* 4230 */
458	sys	sys_llistxattr		3
459	sys	sys_flistxattr		3
460	sys	sys_removexattr		2
461	sys	sys_lremovexattr	2
462	sys	sys_fremovexattr	2	/* 4235 */
463	sys	sys_tkill		2
464	sys	sys_sendfile64		5
465	sys	sys_futex		6
466#ifdef CONFIG_MIPS_MT_FPAFF
467	/*
468	 * For FPU affinity scheduling on MIPS MT processors, we need to
469	 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
470	 * in kernel/sched.c.  Considered only temporary we only support these
471	 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
472	 */
473	sys	mipsmt_sys_sched_setaffinity	3
474	sys	mipsmt_sys_sched_getaffinity	3
475#else
476	sys	sys_sched_setaffinity	3
477	sys	sys_sched_getaffinity	3	/* 4240 */
478#endif /* CONFIG_MIPS_MT_FPAFF */
479	sys	sys_io_setup		2
480	sys	sys_io_destroy		1
481	sys	sys_io_getevents	5
482	sys	sys_io_submit		3
483	sys	sys_io_cancel		3	/* 4245 */
484	sys	sys_exit_group		1
485	sys	sys_lookup_dcookie	4
486	sys	sys_epoll_create	1
487	sys	sys_epoll_ctl		4
488	sys	sys_epoll_wait		4	/* 4250 */
489	sys	sys_remap_file_pages	5
490	sys	sys_set_tid_address	1
491	sys	sys_restart_syscall	0
492	sys	sys_fadvise64_64	7
493	sys	sys_statfs64		3	/* 4255 */
494	sys	sys_fstatfs64		2
495	sys	sys_timer_create	3
496	sys	sys_timer_settime	4
497	sys	sys_timer_gettime	2
498	sys	sys_timer_getoverrun	1	/* 4260 */
499	sys	sys_timer_delete	1
500	sys	sys_clock_settime	2
501	sys	sys_clock_gettime	2
502	sys	sys_clock_getres	2
503	sys	sys_clock_nanosleep	4	/* 4265 */
504	sys	sys_tgkill		3
505	sys	sys_utimes		2
506	sys	sys_mbind		4
507	sys	sys_ni_syscall		0	/* sys_get_mempolicy */
508	sys	sys_ni_syscall		0	/* 4270 sys_set_mempolicy */
509	sys	sys_mq_open		4
510	sys	sys_mq_unlink		1
511	sys	sys_mq_timedsend	5
512	sys	sys_mq_timedreceive	5
513	sys	sys_mq_notify		2	/* 4275 */
514	sys	sys_mq_getsetattr	3
515	sys	sys_ni_syscall		0	/* sys_vserver */
516	sys	sys_waitid		5
517	sys	sys_ni_syscall		0	/* available, was setaltroot */
518	sys	sys_add_key		5	/* 4280 */
519	sys	sys_request_key		4
520	sys	sys_keyctl		5
521	sys	sys_set_thread_area	1
522	sys	sys_inotify_init	0
523	sys	sys_inotify_add_watch	3	/* 4285 */
524	sys	sys_inotify_rm_watch	2
525	sys	sys_migrate_pages	4
526	sys	sys_openat		4
527	sys	sys_mkdirat		3
528	sys	sys_mknodat		4	/* 4290 */
529	sys	sys_fchownat		5
530	sys	sys_futimesat		3
531	sys	sys_fstatat64		4
532	sys	sys_unlinkat		3
533	sys	sys_renameat		4	/* 4295 */
534	sys	sys_linkat		5
535	sys	sys_symlinkat		3
536	sys	sys_readlinkat		4
537	sys	sys_fchmodat		3
538	sys	sys_faccessat		3	/* 4300 */
539	sys	sys_pselect6		6
540	sys	sys_ppoll		5
541	sys	sys_unshare		1
542	sys	sys_splice		6
543	sys	sys_sync_file_range	7	/* 4305 */
544	sys	sys_tee			4
545	sys	sys_vmsplice		4
546	sys	sys_move_pages		6
547	sys	sys_set_robust_list	2
548	sys	sys_get_robust_list	3	/* 4310 */
549	sys	sys_kexec_load		4
550	sys	sys_getcpu		3
551	sys	sys_epoll_pwait		6
552	sys	sys_ioprio_set		3
553	sys	sys_ioprio_get		2	/* 4315 */
554	sys	sys_utimensat		4
555	sys	sys_signalfd		3
556	sys	sys_ni_syscall		0	/* was timerfd */
557	sys	sys_eventfd		1
558	sys	sys_fallocate		6	/* 4320 */
559	sys	sys_timerfd_create	2
560	sys	sys_timerfd_gettime	2
561	sys	sys_timerfd_settime	4
562	sys	sys_signalfd4		4
563	sys	sys_eventfd2		2	/* 4325 */
564	sys	sys_epoll_create1	1
565	sys	sys_dup3		3
566	sys	sys_pipe2		2
567	sys	sys_inotify_init1	1
568	sys	sys_preadv		6	/* 4330 */
569	sys	sys_pwritev		6
570	sys	sys_rt_tgsigqueueinfo	4
571	sys	sys_perf_event_open	5
572	sys	sys_accept4		4
573	sys	sys_recvmmsg		5	/* 4335 */
574	sys	sys_fanotify_init	2
575	sys	sys_fanotify_mark	6
576	sys	sys_prlimit64		4
577	sys	sys_name_to_handle_at	5
578	sys	sys_open_by_handle_at	3	/* 4340 */
579	sys	sys_clock_adjtime	2
580	sys	sys_syncfs		1
581	sys	sys_sendmmsg		4
582	sys	sys_setns		2
583	sys	sys_process_vm_readv	6	/* 4345 */
584	sys	sys_process_vm_writev	6
585	sys	sys_kcmp		5
586	.endm
587
588	/* We pre-compute the number of _instruction_ bytes needed to
589	   load or store the arguments 6-8. Negative values are ignored. */
590
591	.macro  sys function, nargs
592	PTR	\function
593	LONG	(\nargs << 2) - (5 << 2)
594	.endm
595
596	.align	3
597	.type	sys_call_table,@object
598EXPORT(sys_call_table)
599	syscalltable
600	.size	sys_call_table, . - sys_call_table
601