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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * S390 low-level entry points.
3 *
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02004 * Copyright IBM Corp. 1999, 2012
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
Heiko Carstens25d83cb2006-09-28 16:56:37 +02006 * Hartmut Penner (hp@de.ibm.com),
7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
Heiko Carstens77fa2242005-06-25 14:55:30 -07008 * Heiko Carstens <heiko.carstens@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
Heiko Carstens2bc89b52008-02-05 16:50:40 +010011#include <linux/init.h>
Jan Glauber144d6342011-07-24 10:48:19 +020012#include <linux/linkage.h>
Heiko Carstenseb608fb2012-09-05 13:26:11 +020013#include <asm/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <asm/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/errno.h>
16#include <asm/ptrace.h>
17#include <asm/thread_info.h>
Sam Ravnborg0013a852005-09-09 20:57:26 +020018#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/unistd.h>
20#include <asm/page.h>
Heiko Carstenseb546192012-06-04 15:05:43 +020021#include <asm/sigp.h>
Martin Schwidefsky1f44a222013-06-27 09:01:09 +020022#include <asm/irq.h>
Hendrik Brueckner9977e882015-06-10 12:53:42 +020023#include <asm/vx-insn.h>
Hendrik Brueckner83abeff2015-10-01 17:02:48 +020024#include <asm/setup.h>
25#include <asm/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Martin Schwidefskyc5328902011-12-27 11:27:15 +010027__PT_R0 = __PT_GPRS
28__PT_R1 = __PT_GPRS + 8
29__PT_R2 = __PT_GPRS + 16
30__PT_R3 = __PT_GPRS + 24
31__PT_R4 = __PT_GPRS + 32
32__PT_R5 = __PT_GPRS + 40
33__PT_R6 = __PT_GPRS + 48
34__PT_R7 = __PT_GPRS + 56
35__PT_R8 = __PT_GPRS + 64
36__PT_R9 = __PT_GPRS + 72
37__PT_R10 = __PT_GPRS + 80
38__PT_R11 = __PT_GPRS + 88
39__PT_R12 = __PT_GPRS + 96
40__PT_R13 = __PT_GPRS + 104
41__PT_R14 = __PT_GPRS + 112
42__PT_R15 = __PT_GPRS + 120
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
45STACK_SIZE = 1 << STACK_SHIFT
Martin Schwidefskydc7ee002013-04-24 10:20:43 +020046STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Jan Willeke2a0a5b22014-09-22 16:39:06 +020048_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
49 _TIF_UPROBE)
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +020050_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
51 _TIF_SYSCALL_TRACEPOINT)
Hendrik Brueckner9977e882015-06-10 12:53:42 +020052_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE | _CIF_FPU)
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +020053_PIF_WORK = (_PIF_PER_TRAP)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Hendrik Brueckner9977e882015-06-10 12:53:42 +020055#define BASED(name) name-cleanup_critical(%r13)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Martin Schwidefskyc5328902011-12-27 11:27:15 +010057 .macro TRACE_IRQS_ON
58#ifdef CONFIG_TRACE_IRQFLAGS
59 basr %r2,%r0
60 brasl %r14,trace_hardirqs_on_caller
61#endif
62 .endm
63
64 .macro TRACE_IRQS_OFF
65#ifdef CONFIG_TRACE_IRQFLAGS
66 basr %r2,%r0
67 brasl %r14,trace_hardirqs_off_caller
68#endif
69 .endm
70
71 .macro LOCKDEP_SYS_EXIT
72#ifdef CONFIG_LOCKDEP
73 tm __PT_PSW+1(%r11),0x01 # returning to user ?
74 jz .+10
75 brasl %r14,lockdep_sys_exit
76#endif
77 .endm
78
Martin Schwidefskyc5328902011-12-27 11:27:15 +010079 .macro CHECK_STACK stacksize,savearea
Martin Schwidefsky63b12242006-06-29 14:58:05 +020080#ifdef CONFIG_CHECK_STACK
Martin Schwidefskyc5328902011-12-27 11:27:15 +010081 tml %r15,\stacksize - CONFIG_STACK_GUARD
82 lghi %r14,\savearea
83 jz stack_overflow
Martin Schwidefsky63b12242006-06-29 14:58:05 +020084#endif
Martin Schwidefsky63b12242006-06-29 14:58:05 +020085 .endm
86
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +020087 .macro SWITCH_ASYNC savearea,timer
Martin Schwidefskyc5328902011-12-27 11:27:15 +010088 tmhh %r8,0x0001 # interrupting from user ?
89 jnz 1f
90 lgr %r14,%r9
91 slg %r14,BASED(.Lcritical_start)
92 clg %r14,BASED(.Lcritical_length)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 jhe 0f
Martin Schwidefskyc5328902011-12-27 11:27:15 +010094 lghi %r11,\savearea # inside critical section, do cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 brasl %r14,cleanup_critical
Martin Schwidefskyc5328902011-12-27 11:27:15 +010096 tmhh %r8,0x0001 # retest problem state after cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 jnz 1f
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200980: lg %r14,__LC_ASYNC_STACK # are we already on the async stack?
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 slgr %r14,%r15
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200100 srag %r14,%r14,STACK_SHIFT
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200101 jnz 2f
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200102 CHECK_STACK 1<<STACK_SHIFT,\savearea
Martin Schwidefskydc7ee002013-04-24 10:20:43 +0200103 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200104 j 3f
1051: LAST_BREAK %r14
106 UPDATE_VTIME %r14,%r15,\timer
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +02001072: lg %r15,__LC_ASYNC_STACK # load async stack
Martin Schwidefskya359bb12015-06-22 17:27:48 +02001083: la %r11,STACK_FRAME_OVERHEAD(%r15)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700109 .endm
110
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200111 .macro UPDATE_VTIME w1,w2,enter_timer
112 lg \w1,__LC_EXIT_TIMER
113 lg \w2,__LC_LAST_UPDATE_TIMER
114 slg \w1,\enter_timer
115 slg \w2,__LC_EXIT_TIMER
116 alg \w1,__LC_USER_TIMER
117 alg \w2,__LC_SYSTEM_TIMER
118 stg \w1,__LC_USER_TIMER
119 stg \w2,__LC_SYSTEM_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100120 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200121 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100123 .macro LAST_BREAK scratch
124 srag \scratch,%r10,23
125 jz .+10
126 stg %r10,__TI_last_break(%r12)
Martin Schwidefsky86f25522010-05-17 10:00:05 +0200127 .endm
128
Martin Schwidefsky1e546222010-10-25 16:10:37 +0200129 .macro REENABLE_IRQS
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100130 stg %r8,__LC_RETURN_PSW
131 ni __LC_RETURN_PSW,0xbf
132 ssm __LC_RETURN_PSW
Martin Schwidefsky1e546222010-10-25 16:10:37 +0200133 .endm
134
Heiko Carstens473e66b2012-05-09 16:27:39 +0200135 .macro STCK savearea
Heiko Carstensd652d592012-05-14 10:35:22 +0200136#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
Heiko Carstens473e66b2012-05-09 16:27:39 +0200137 .insn s,0xb27c0000,\savearea # store clock fast
138#else
139 .insn s,0xb2050000,\savearea # store clock
140#endif
141 .endm
142
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200143 /*
144 * The TSTMSK macro generates a test-under-mask instruction by
145 * calculating the memory offset for the specified mask value.
146 * Mask value can be any constant. The macro shifts the mask
147 * value to calculate the memory offset for the test-under-mask
148 * instruction.
149 */
150 .macro TSTMSK addr, mask, size=8, bytepos=0
151 .if (\bytepos < \size) && (\mask >> 8)
152 .if (\mask & 0xff)
153 .error "Mask exceeds byte boundary"
154 .endif
155 TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)"
156 .exitm
157 .endif
158 .ifeq \mask
159 .error "Mask must not be zero"
160 .endif
161 off = \size - \bytepos - 1
162 tm off+\addr, \mask
163 .endm
164
Martin Schwidefsky860dba42011-01-05 12:47:25 +0100165 .section .kprobes.text, "ax"
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167/*
168 * Scheduler resume function, called by switch_to
169 * gpr2 = (task_struct *) prev
170 * gpr3 = (task_struct *) next
171 * Returns:
172 * gpr2 = prev
173 */
Jan Glauber144d6342011-07-24 10:48:19 +0200174ENTRY(__switch_to)
Martin Schwidefskyeda0c6d2012-05-15 09:20:06 +0200175 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
Martin Schwidefsky3827ec32015-07-20 10:01:46 +0200176 lgr %r1,%r2
177 aghi %r1,__TASK_thread # thread_struct of prev task
178 lg %r4,__TASK_thread_info(%r2) # get thread_info of prev
179 lg %r5,__TASK_thread_info(%r3) # get thread_info of next
180 stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev
181 lgr %r1,%r3
182 aghi %r1,__TASK_thread # thread_struct of next task
Martin Schwidefskyeda0c6d2012-05-15 09:20:06 +0200183 lgr %r15,%r5
Martin Schwidefskydc7ee002013-04-24 10:20:43 +0200184 aghi %r15,STACK_INIT # end of kernel stack of next
Martin Schwidefskyeda0c6d2012-05-15 09:20:06 +0200185 stg %r3,__LC_CURRENT # store task struct of next
186 stg %r5,__LC_THREAD_INFO # store thread info of next
187 stg %r15,__LC_KERNEL_STACK # store end of kernel stack
Martin Schwidefsky3827ec32015-07-20 10:01:46 +0200188 lg %r15,__THREAD_ksp(%r1) # load kernel stack of next
Christian Borntraegerb1685ab2016-02-29 16:05:35 +0100189 /* c4 is used in guest detection: arch/s390/kernel/perf_cpum_sf.c */
Martin Schwidefskyeda0c6d2012-05-15 09:20:06 +0200190 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200191 mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200192 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200193 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
194 bzr %r14
195 .insn s,0xb2800000,__LC_LPP # set program parameter
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 br %r14
197
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100198.L__critical_start:
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200199
200#if IS_ENABLED(CONFIG_KVM)
201/*
202 * sie64a calling convention:
203 * %r2 pointer to sie control block
204 * %r3 guest register save area
205 */
206ENTRY(sie64a)
207 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
208 stg %r2,__SF_EMPTY(%r15) # save control block pointer
209 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200210 xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200211 TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ?
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200212 jno .Lsie_load_guest_gprs
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200213 brasl %r14,load_fpu_regs # load guest fp/vx regs
214.Lsie_load_guest_gprs:
215 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
216 lg %r14,__LC_GMAP # get gmap pointer
217 ltgr %r14,%r14
218 jz .Lsie_gmap
219 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
220.Lsie_gmap:
221 lg %r14,__SF_EMPTY(%r15) # get control block pointer
222 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
223 tm __SIE_PROG20+3(%r14),3 # last exit...
224 jnz .Lsie_skip
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200225 TSTMSK __LC_CPU_FLAGS,_CIF_FPU
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200226 jo .Lsie_skip # exit if fp/vx regs changed
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200227 sie 0(%r14)
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200228.Lsie_skip:
229 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
230 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
231.Lsie_done:
232# some program checks are suppressing. C code (e.g. do_protection_exception)
233# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
234# instructions between sie64a and .Lsie_done should not cause program
235# interrupts. So lets use a nop (47 00 00 00) as a landing pad.
236# See also .Lcleanup_sie
237.Lrewind_pad:
238 nop 0
239 .globl sie_exit
240sie_exit:
241 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
242 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
243 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200244 lg %r2,__SF_EMPTY+16(%r15) # return exit reason code
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200245 br %r14
246.Lsie_fault:
247 lghi %r14,-EFAULT
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200248 stg %r14,__SF_EMPTY+16(%r15) # set exit reason code
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200249 j sie_exit
250
251 EX_TABLE(.Lrewind_pad,.Lsie_fault)
252 EX_TABLE(sie_exit,.Lsie_fault)
253#endif
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255/*
256 * SVC interrupt handler routine. System calls are synchronous events and
257 * are executed with interrupts enabled.
258 */
259
Jan Glauber144d6342011-07-24 10:48:19 +0200260ENTRY(system_call)
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100261 stpt __LC_SYNC_ENTER_TIMER
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100262.Lsysc_stmg:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100263 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
264 lg %r10,__LC_LAST_BREAK
265 lg %r12,__LC_THREAD_INFO
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200266 lghi %r14,_PIF_SYSCALL
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100267.Lsysc_per:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100268 lg %r15,__LC_KERNEL_STACK
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100269 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100270 LAST_BREAK %r13
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200271.Lsysc_vtime:
272 UPDATE_VTIME %r10,%r13,__LC_SYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100273 stmg %r0,%r7,__PT_R0(%r11)
274 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
275 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100276 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200277 stg %r14,__PT_FLAGS(%r11)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100278.Lsysc_do_svc:
Martin Schwidefsky61649882013-04-24 12:58:39 +0200279 lg %r10,__TI_sysc_table(%r12) # address of system call table
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100280 llgh %r8,__PT_INT_CODE+2(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100281 slag %r8,%r8,2 # shift and test for svc 0
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100282 jnz .Lsysc_nr_ok
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 # svc 0: system call number in %r1
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100284 llgfr %r1,%r1 # clear high word in r1
Martin Schwidefsky86f25522010-05-17 10:00:05 +0200285 cghi %r1,NR_syscalls
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100286 jnl .Lsysc_nr_ok
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100287 sth %r1,__PT_INT_CODE+2(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100288 slag %r8,%r1,2
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100289.Lsysc_nr_ok:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100290 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
291 stg %r2,__PT_ORIG_GPR2(%r11)
292 stg %r7,STACK_FRAME_OVERHEAD(%r15)
293 lgf %r9,0(%r8,%r10) # get system call add.
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200294 TSTMSK __TI_flags(%r12),_TIF_TRACE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100295 jnz .Lsysc_tracesys
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100296 basr %r14,%r9 # call sys_xxxx
297 stg %r2,__PT_R2(%r11) # store return value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100299.Lsysc_return:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200300 LOCKDEP_SYS_EXIT
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100301.Lsysc_tif:
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200302 TSTMSK __PT_FLAGS(%r11),_PIF_WORK
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100303 jnz .Lsysc_work
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200304 TSTMSK __TI_flags(%r12),_TIF_WORK
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100305 jnz .Lsysc_work # check for work
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200306 TSTMSK __LC_CPU_FLAGS,_CIF_WORK
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100307 jnz .Lsysc_work
308.Lsysc_restore:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100309 lg %r14,__LC_VDSO_PER_CPU
310 lmg %r0,%r10,__PT_R0(%r11)
311 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
312 stpt __LC_EXIT_TIMER
313 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
314 lmg %r11,%r15,__PT_R11(%r11)
315 lpswe __LC_RETURN_PSW
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100316.Lsysc_done:
Heiko Carstens411788e2007-11-20 11:13:32 +0100317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318#
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200319# One of the work bits is on. Find out which one.
320#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100321.Lsysc_work:
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200322 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100323 jo .Lsysc_mcck_pending
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200324 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100325 jo .Lsysc_reschedule
Jan Willeke2a0a5b22014-09-22 16:39:06 +0200326#ifdef CONFIG_UPROBES
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200327 TSTMSK __TI_flags(%r12),_TIF_UPROBE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100328 jo .Lsysc_uprobe_notify
Jan Willeke2a0a5b22014-09-22 16:39:06 +0200329#endif
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200330 TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100331 jo .Lsysc_singlestep
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200332 TSTMSK __TI_flags(%r12),_TIF_SIGPENDING
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100333 jo .Lsysc_sigpending
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200334 TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100335 jo .Lsysc_notify_resume
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200336 TSTMSK __LC_CPU_FLAGS,_CIF_FPU
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200337 jo .Lsysc_vxrs
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200338 TSTMSK __LC_CPU_FLAGS,_CIF_ASCE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100339 jo .Lsysc_uaccess
340 j .Lsysc_return # beware of critical section cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342#
343# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200344#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100345.Lsysc_reschedule:
346 larl %r14,.Lsysc_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100347 jg schedule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349#
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200350# _CIF_MCCK_PENDING is set, call handler
Heiko Carstens77fa2242005-06-25 14:55:30 -0700351#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100352.Lsysc_mcck_pending:
353 larl %r14,.Lsysc_return
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200354 jg s390_handle_mcck # TIF bit will be cleared by handler
Heiko Carstens77fa2242005-06-25 14:55:30 -0700355
356#
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200357# _CIF_ASCE is set, load user space asce
Heiko Carstens457f2182014-03-21 10:42:25 +0100358#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100359.Lsysc_uaccess:
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200360 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
Heiko Carstens457f2182014-03-21 10:42:25 +0100361 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100362 j .Lsysc_return
Heiko Carstens457f2182014-03-21 10:42:25 +0100363
364#
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200365# CIF_FPU is set, restore floating-point controls and floating-point registers.
366#
367.Lsysc_vxrs:
368 larl %r14,.Lsysc_return
369 jg load_fpu_regs
370
371#
Roland McGrath02a029b2008-04-30 00:53:08 -0700372# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100374.Lsysc_sigpending:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100375 lgr %r2,%r11 # pass pointer to pt_regs
376 brasl %r14,do_signal
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200377 TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100378 jno .Lsysc_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100379 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
Martin Schwidefskydbbfe482013-09-27 15:24:38 +0200380 lg %r10,__TI_sysc_table(%r12) # address of system call table
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100381 lghi %r8,0 # svc 0 returns -ENOSYS
Martin Schwidefsky450e47d2012-10-09 13:33:53 +0200382 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number
Martin Schwidefskyb6ef5bb2011-10-30 15:16:49 +0100383 cghi %r1,NR_syscalls
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100384 jnl .Lsysc_nr_ok # invalid svc number -> do svc 0
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100385 slag %r8,%r1,2
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100386 j .Lsysc_nr_ok # restart svc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388#
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200389# _TIF_NOTIFY_RESUME is set, call do_notify_resume
390#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100391.Lsysc_notify_resume:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100392 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100393 larl %r14,.Lsysc_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100394 jg do_notify_resume
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200395
396#
Jan Willeke2a0a5b22014-09-22 16:39:06 +0200397# _TIF_UPROBE is set, call uprobe_notify_resume
398#
399#ifdef CONFIG_UPROBES
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100400.Lsysc_uprobe_notify:
Jan Willeke2a0a5b22014-09-22 16:39:06 +0200401 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100402 larl %r14,.Lsysc_return
Jan Willeke2a0a5b22014-09-22 16:39:06 +0200403 jg uprobe_notify_resume
404#endif
405
406#
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200407# _PIF_PER_TRAP is set, call do_per_trap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100409.Lsysc_singlestep:
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200410 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100411 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100412 larl %r14,.Lsysc_return
Martin Schwidefsky5e9a2692011-01-05 12:48:10 +0100413 jg do_per_trap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415#
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200416# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
417# and after the system call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100419.Lsysc_tracesys:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100420 lgr %r2,%r11 # pass pointer to pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 la %r3,0
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100422 llgh %r0,__PT_INT_CODE+2(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100423 stg %r0,__PT_R2(%r11)
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200424 brasl %r14,do_syscall_trace_enter
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 lghi %r0,NR_syscalls
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200426 clgr %r0,%r2
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100427 jnh .Lsysc_tracenogo
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100428 sllg %r8,%r2,2
429 lgf %r9,0(%r8,%r10)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100430.Lsysc_tracego:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100431 lmg %r3,%r7,__PT_R3(%r11)
432 stg %r7,STACK_FRAME_OVERHEAD(%r15)
433 lg %r2,__PT_ORIG_GPR2(%r11)
434 basr %r14,%r9 # call sys_xxx
435 stg %r2,__PT_R2(%r11) # store return value
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100436.Lsysc_tracenogo:
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200437 TSTMSK __TI_flags(%r12),_TIF_TRACE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100438 jz .Lsysc_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100439 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100440 larl %r14,.Lsysc_return
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200441 jg do_syscall_trace_exit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443#
444# a new process exits the kernel with ret_from_fork
445#
Jan Glauber144d6342011-07-24 10:48:19 +0200446ENTRY(ret_from_fork)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100447 la %r11,STACK_FRAME_OVERHEAD(%r15)
448 lg %r12,__LC_THREAD_INFO
Al Viro30dcb092012-10-11 15:30:14 -0400449 brasl %r14,schedule_tail
450 TRACE_IRQS_ON
451 ssm __LC_SVC_NEW_PSW # reenable interrupts
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100452 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100453 jne .Lsysc_tracenogo
Al Viro30dcb092012-10-11 15:30:14 -0400454 # it's a kernel thread
455 lmg %r9,%r10,__PT_R9(%r11) # load gprs
Al Viro37fe5d42012-09-10 18:03:41 -0400456ENTRY(kernel_thread_starter)
457 la %r2,0(%r10)
458 basr %r14,%r9
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100459 j .Lsysc_tracenogo
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461/*
462 * Program check handler routine
463 */
464
Jan Glauber144d6342011-07-24 10:48:19 +0200465ENTRY(pgm_check_handler)
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100466 stpt __LC_SYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100467 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
468 lg %r10,__LC_LAST_BREAK
469 lg %r12,__LC_THREAD_INFO
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200470 larl %r13,cleanup_critical
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100471 lmg %r8,%r9,__LC_PGM_OLD_PSW
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100472 tmhh %r8,0x0001 # test problem state bit
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200473 jnz 2f # -> fault in user space
474#if IS_ENABLED(CONFIG_KVM)
475 # cleanup critical section for sie64a
476 lgr %r14,%r9
477 slg %r14,BASED(.Lsie_critical_start)
478 clg %r14,BASED(.Lsie_critical_length)
479 jhe 0f
480 brasl %r14,.Lcleanup_sie
481#endif
4820: tmhh %r8,0x4000 # PER bit set in old PSW ?
483 jnz 1f # -> enabled, can't be a double fault
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100484 tm __LC_PGM_ILC+3,0x80 # check for per exception
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100485 jnz .Lpgm_svcper # -> single stepped svc
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02004861: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
Martin Schwidefskydc7ee002013-04-24 10:20:43 +0200487 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200488 j 3f
Martin Schwidefskya359bb12015-06-22 17:27:48 +02004892: LAST_BREAK %r14
490 UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100491 lg %r15,__LC_KERNEL_STACK
Martin Schwidefskyd35339a2012-07-31 11:03:04 +0200492 lg %r14,__TI_task(%r12)
Martin Schwidefsky3827ec32015-07-20 10:01:46 +0200493 aghi %r14,__TASK_thread # pointer to thread_struct
Martin Schwidefskyd35339a2012-07-31 11:03:04 +0200494 lghi %r13,__LC_PGM_TDB
495 tm __LC_PGM_ILC+2,0x02 # check for transaction abort
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200496 jz 3f
Martin Schwidefskyd35339a2012-07-31 11:03:04 +0200497 mvc __THREAD_trap_tdb(256,%r14),0(%r13)
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02004983: la %r11,STACK_FRAME_OVERHEAD(%r15)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100499 stmg %r0,%r7,__PT_R0(%r11)
500 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
501 stmg %r8,%r9,__PT_PSW(%r11)
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100502 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
503 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200504 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100505 stg %r10,__PT_ARGS(%r11)
506 tm __LC_PGM_ILC+3,0x80 # check for per exception
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200507 jz 4f
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100508 tmhh %r8,0x0001 # kernel per event ?
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100509 jz .Lpgm_kprobe
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200510 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP
Martin Schwidefskyd35339a2012-07-31 11:03:04 +0200511 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS
Jens Freimann21ee7ff2014-02-26 16:32:46 +0100512 mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE
513 mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02005144: REENABLE_IRQS
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100515 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
Heiko Carstensf5cdac22010-07-27 19:29:37 +0200516 larl %r1,pgm_check_table
Martin Schwidefskyaa33c8c2011-12-27 11:27:18 +0100517 llgh %r10,__PT_INT_CODE+2(%r11)
518 nill %r10,0x007f
Heiko Carstensb01a37a2012-10-18 18:10:06 +0200519 sll %r10,2
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200520 je .Lpgm_return
Heiko Carstensb01a37a2012-10-18 18:10:06 +0200521 lgf %r1,0(%r10,%r1) # load address of handler routine
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100522 lgr %r2,%r11 # pass pointer to pt_regs
Heiko Carstensf5cdac22010-07-27 19:29:37 +0200523 basr %r14,%r1 # branch to interrupt-handler
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200524.Lpgm_return:
525 LOCKDEP_SYS_EXIT
526 tm __PT_PSW+1(%r11),0x01 # returning to user ?
527 jno .Lsysc_restore
528 j .Lsysc_tif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530#
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100531# PER event in supervisor state, must be kprobes
532#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100533.Lpgm_kprobe:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100534 REENABLE_IRQS
535 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
536 lgr %r2,%r11 # pass pointer to pt_regs
537 brasl %r14,do_per_trap
Martin Schwidefskya359bb12015-06-22 17:27:48 +0200538 j .Lpgm_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100539
540#
541# single stepped system call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100543.Lpgm_svcper:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100544 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100545 larl %r14,.Lsysc_per
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100546 stg %r14,__LC_RETURN_PSW+8
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200547 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100548 lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs
Michael Grundy4ba069b2006-09-20 15:58:39 +0200549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550/*
551 * IO interrupt handler routine
552 */
Jan Glauber144d6342011-07-24 10:48:19 +0200553ENTRY(io_int_handler)
Heiko Carstens473e66b2012-05-09 16:27:39 +0200554 STCK __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100555 stpt __LC_ASYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100556 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
557 lg %r10,__LC_LAST_BREAK
558 lg %r12,__LC_THREAD_INFO
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200559 larl %r13,cleanup_critical
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100560 lmg %r8,%r9,__LC_IO_OLD_PSW
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200561 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100562 stmg %r0,%r7,__PT_R0(%r11)
563 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
564 stmg %r8,%r9,__PT_PSW(%r11)
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200565 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200566 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
Heiko Carstensdb7e0072015-08-15 11:42:21 +0200567 TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ
568 jo .Lio_restore
Heiko Carstens1f194a42006-07-03 00:24:46 -0700569 TRACE_IRQS_OFF
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100570 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100571.Lio_loop:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100572 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200573 lghi %r3,IO_INTERRUPT
574 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ?
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100575 jz .Lio_call
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200576 lghi %r3,THIN_INTERRUPT
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100577.Lio_call:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100578 brasl %r14,do_IRQ
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200579 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100580 jz .Lio_return
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200581 tpi 0
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100582 jz .Lio_return
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200583 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100584 j .Lio_loop
585.Lio_return:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200586 LOCKDEP_SYS_EXIT
587 TRACE_IRQS_ON
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100588.Lio_tif:
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200589 TSTMSK __TI_flags(%r12),_TIF_WORK
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100590 jnz .Lio_work # there is work to do (signals etc.)
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200591 TSTMSK __LC_CPU_FLAGS,_CIF_WORK
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100592 jnz .Lio_work
593.Lio_restore:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100594 lg %r14,__LC_VDSO_PER_CPU
595 lmg %r0,%r10,__PT_R0(%r11)
596 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100597 stpt __LC_EXIT_TIMER
598 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
599 lmg %r11,%r15,__PT_R11(%r11)
600 lpswe __LC_RETURN_PSW
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100601.Lio_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
Martin Schwidefsky26889052008-05-07 09:22:52 +0200603#
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200604# There is work todo, find out in which context we have been interrupted:
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200605# 1) if we return to user space we can do all _TIF_WORK work
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200606# 2) if we return to kernel code and kvm is enabled check if we need to
607# modify the psw to leave SIE
608# 3) if we return to kernel code and preemptive scheduling is enabled check
609# the preemption counter and if it is zero call preempt_schedule_irq
610# Before any work can be done, a switch to the kernel stack is required.
Martin Schwidefsky26889052008-05-07 09:22:52 +0200611#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100612.Lio_work:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100613 tm __PT_PSW+1(%r11),0x01 # returning to user ?
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100614 jo .Lio_work_user # yes -> do resched & signal
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200615#ifdef CONFIG_PREEMPT
Martin Schwidefsky26889052008-05-07 09:22:52 +0200616 # check for preemptive scheduling
Martin Schwidefsky86f25522010-05-17 10:00:05 +0200617 icm %r0,15,__TI_precount(%r12)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100618 jnz .Lio_restore # preemption is disabled
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200619 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100620 jno .Lio_restore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 # switch to kernel stack
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100622 lg %r1,__PT_R15(%r11)
623 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
624 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
625 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
626 la %r11,STACK_FRAME_OVERHEAD(%r1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 lgr %r15,%r1
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100628 # TRACE_IRQS_ON already done at .Lio_return, call
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200629 # TRACE_IRQS_OFF to keep things symmetrical
630 TRACE_IRQS_OFF
631 brasl %r14,preempt_schedule_irq
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100632 j .Lio_return
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200633#else
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100634 j .Lio_restore
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200635#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200637#
638# Need to do work before returning to userspace, switch to kernel stack
639#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100640.Lio_work_user:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 lg %r1,__LC_KERNEL_STACK
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100642 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
643 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
644 la %r11,STACK_FRAME_OVERHEAD(%r1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 lgr %r15,%r1
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647#
648# One of the work bits is on. Find out which one.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100650.Lio_work_tif:
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200651 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100652 jo .Lio_mcck_pending
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200653 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100654 jo .Lio_reschedule
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200655 TSTMSK __TI_flags(%r12),_TIF_SIGPENDING
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100656 jo .Lio_sigpending
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200657 TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100658 jo .Lio_notify_resume
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200659 TSTMSK __LC_CPU_FLAGS,_CIF_FPU
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200660 jo .Lio_vxrs
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200661 TSTMSK __LC_CPU_FLAGS,_CIF_ASCE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100662 jo .Lio_uaccess
663 j .Lio_return # beware of critical section cleanup
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200664
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665#
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200666# _CIF_MCCK_PENDING is set, call handler
Heiko Carstens77fa2242005-06-25 14:55:30 -0700667#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100668.Lio_mcck_pending:
669 # TRACE_IRQS_ON already done at .Lio_return
Heiko Carstensb771aea2007-07-27 12:29:18 +0200670 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200671 TRACE_IRQS_OFF
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100672 j .Lio_return
Heiko Carstens77fa2242005-06-25 14:55:30 -0700673
674#
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200675# _CIF_ASCE is set, load user space asce
Heiko Carstens457f2182014-03-21 10:42:25 +0100676#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100677.Lio_uaccess:
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200678 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
Heiko Carstens457f2182014-03-21 10:42:25 +0100679 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100680 j .Lio_return
Heiko Carstens457f2182014-03-21 10:42:25 +0100681
682#
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200683# CIF_FPU is set, restore floating-point controls and floating-point registers.
684#
685.Lio_vxrs:
686 larl %r14,.Lio_return
687 jg load_fpu_regs
688
689#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200691#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100692.Lio_reschedule:
693 # TRACE_IRQS_ON already done at .Lio_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100694 ssm __LC_SVC_NEW_PSW # reenable interrupts
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200695 brasl %r14,schedule # call scheduler
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100696 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100697 TRACE_IRQS_OFF
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100698 j .Lio_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700#
Roland McGrath02a029b2008-04-30 00:53:08 -0700701# _TIF_SIGPENDING or is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100703.Lio_sigpending:
704 # TRACE_IRQS_ON already done at .Lio_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100705 ssm __LC_SVC_NEW_PSW # reenable interrupts
706 lgr %r2,%r11 # pass pointer to pt_regs
707 brasl %r14,do_signal
708 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100709 TRACE_IRQS_OFF
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100710 j .Lio_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200712#
713# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
714#
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100715.Lio_notify_resume:
716 # TRACE_IRQS_ON already done at .Lio_return
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100717 ssm __LC_SVC_NEW_PSW # reenable interrupts
718 lgr %r2,%r11 # pass pointer to pt_regs
719 brasl %r14,do_notify_resume
720 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200721 TRACE_IRQS_OFF
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100722 j .Lio_return
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724/*
725 * External interrupt handler routine
726 */
Jan Glauber144d6342011-07-24 10:48:19 +0200727ENTRY(ext_int_handler)
Heiko Carstens473e66b2012-05-09 16:27:39 +0200728 STCK __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100729 stpt __LC_ASYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100730 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
731 lg %r10,__LC_LAST_BREAK
732 lg %r12,__LC_THREAD_INFO
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200733 larl %r13,cleanup_critical
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100734 lmg %r8,%r9,__LC_EXT_OLD_PSW
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200735 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100736 stmg %r0,%r7,__PT_R0(%r11)
737 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
738 stmg %r8,%r9,__PT_PSW(%r11)
Martin Schwidefsky48f6b002013-06-17 14:54:02 +0200739 lghi %r1,__LC_EXT_PARAMS2
740 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
741 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
742 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1)
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200743 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
Heiko Carstensdb7e0072015-08-15 11:42:21 +0200744 TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ
745 jo .Lio_restore
Heiko Carstens1f194a42006-07-03 00:24:46 -0700746 TRACE_IRQS_OFF
Michael Holzheu0de9db32012-05-09 16:27:35 +0200747 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100748 lgr %r2,%r11 # pass pointer to pt_regs
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200749 lghi %r3,EXT_INTERRUPT
750 brasl %r14,do_IRQ
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100751 j .Lio_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -0400753/*
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100754 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -0400755 */
756ENTRY(psw_idle)
Martin Schwidefsky27f6b412012-07-20 11:15:08 +0200757 stg %r3,__SF_EMPTY(%r15)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100758 larl %r1,.Lpsw_idle_lpsw+4
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -0400759 stg %r1,__SF_EMPTY+8(%r15)
Martin Schwidefsky72d38b12015-09-18 16:41:36 +0200760#ifdef CONFIG_SMP
761 larl %r1,smp_cpu_mtid
762 llgf %r1,0(%r1)
763 ltgr %r1,%r1
764 jz .Lpsw_idle_stcctm
765 .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15)
766.Lpsw_idle_stcctm:
767#endif
Martin Schwidefsky419123f2015-11-19 11:09:45 +0100768 oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
Martin Schwidefsky27f6b412012-07-20 11:15:08 +0200769 STCK __CLOCK_IDLE_ENTER(%r2)
770 stpt __TIMER_IDLE_ENTER(%r2)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100771.Lpsw_idle_lpsw:
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -0400772 lpswe __SF_EMPTY(%r15)
773 br %r14
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100774.Lpsw_idle_end:
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -0400775
Hendrik Bruecknerb5510d92015-09-29 10:04:41 +0200776/*
777 * Store floating-point controls and floating-point or vector register
778 * depending whether the vector facility is available. A critical section
779 * cleanup assures that the registers are stored even if interrupted for
780 * some other work. The CIF_FPU flag is set to trigger a lazy restore
781 * of the register contents at return from io or a system call.
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200782 */
783ENTRY(save_fpu_regs)
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200784 lg %r2,__LC_CURRENT
785 aghi %r2,__TASK_thread
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200786 TSTMSK __LC_CPU_FLAGS,_CIF_FPU
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200787 bor %r14
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200788 stfpc __THREAD_FPU_fpc(%r2)
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200789.Lsave_fpu_regs_fpc_end:
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200790 lg %r3,__THREAD_FPU_regs(%r2)
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200791 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200792 jz .Lsave_fpu_regs_fp # no -> store FP regs
793.Lsave_fpu_regs_vx_low:
794 VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3)
795.Lsave_fpu_regs_vx_high:
796 VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3)
797 j .Lsave_fpu_regs_done # -> set CIF_FPU flag
798.Lsave_fpu_regs_fp:
799 std 0,0(%r3)
800 std 1,8(%r3)
801 std 2,16(%r3)
802 std 3,24(%r3)
803 std 4,32(%r3)
804 std 5,40(%r3)
805 std 6,48(%r3)
806 std 7,56(%r3)
807 std 8,64(%r3)
808 std 9,72(%r3)
809 std 10,80(%r3)
810 std 11,88(%r3)
811 std 12,96(%r3)
812 std 13,104(%r3)
813 std 14,112(%r3)
814 std 15,120(%r3)
815.Lsave_fpu_regs_done:
816 oi __LC_CPU_FLAGS+7,_CIF_FPU
817 br %r14
818.Lsave_fpu_regs_end:
819
Hendrik Bruecknerb5510d92015-09-29 10:04:41 +0200820/*
821 * Load floating-point controls and floating-point or vector registers.
822 * A critical section cleanup assures that the register contents are
823 * loaded even if interrupted for some other work.
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200824 *
825 * There are special calling conventions to fit into sysc and io return work:
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200826 * %r15: <kernel stack>
827 * The function requires:
Hendrik Bruecknerb5510d92015-09-29 10:04:41 +0200828 * %r4
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200829 */
830load_fpu_regs:
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200831 lg %r4,__LC_CURRENT
832 aghi %r4,__TASK_thread
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200833 TSTMSK __LC_CPU_FLAGS,_CIF_FPU
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200834 bnor %r14
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200835 lfpc __THREAD_FPU_fpc(%r4)
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200836 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX
Hendrik Bruecknerd0164ee2015-06-29 16:43:06 +0200837 lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area
Hendrik Bruecknerb5510d92015-09-29 10:04:41 +0200838 jz .Lload_fpu_regs_fp # -> no VX, load FP regs
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200839.Lload_fpu_regs_vx:
840 VLM %v0,%v15,0,%r4
841.Lload_fpu_regs_vx_high:
842 VLM %v16,%v31,256,%r4
843 j .Lload_fpu_regs_done
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200844.Lload_fpu_regs_fp:
845 ld 0,0(%r4)
846 ld 1,8(%r4)
847 ld 2,16(%r4)
848 ld 3,24(%r4)
849 ld 4,32(%r4)
850 ld 5,40(%r4)
851 ld 6,48(%r4)
852 ld 7,56(%r4)
853 ld 8,64(%r4)
854 ld 9,72(%r4)
855 ld 10,80(%r4)
856 ld 11,88(%r4)
857 ld 12,96(%r4)
858 ld 13,104(%r4)
859 ld 14,112(%r4)
860 ld 15,120(%r4)
861.Lload_fpu_regs_done:
862 ni __LC_CPU_FLAGS+7,255-_CIF_FPU
863 br %r14
864.Lload_fpu_regs_end:
865
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100866.L__critical_end:
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700867
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868/*
869 * Machine check handler routines
870 */
Jan Glauber144d6342011-07-24 10:48:19 +0200871ENTRY(mcck_int_handler)
Heiko Carstens473e66b2012-05-09 16:27:39 +0200872 STCK __LC_MCCK_CLOCK
Heiko Carstens77fa2242005-06-25 14:55:30 -0700873 la %r1,4095 # revalidate r1
874 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200875 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100876 lg %r10,__LC_LAST_BREAK
877 lg %r12,__LC_THREAD_INFO
Hendrik Brueckner9977e882015-06-10 12:53:42 +0200878 larl %r13,cleanup_critical
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100879 lmg %r8,%r9,__LC_MCK_OLD_PSW
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200880 TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100881 jo .Lmcck_panic # yes -> rest of mcck code invalid
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100882 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
883 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200884 TSTMSK __LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100885 jo 3f
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200886 la %r14,__LC_SYNC_ENTER_TIMER
887 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
888 jl 0f
889 la %r14,__LC_ASYNC_ENTER_TIMER
8900: clc 0(8,%r14),__LC_EXIT_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100891 jl 1f
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200892 la %r14,__LC_EXIT_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +01008931: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
894 jl 2f
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200895 la %r14,__LC_LAST_UPDATE_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +01008962: spt 0(%r14)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200897 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
Hendrik Brueckner83abeff2015-10-01 17:02:48 +02008983: TSTMSK __LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100899 jno .Lmcck_panic # no -> skip cleanup critical
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200900 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100901.Lmcck_skip:
Martin Schwidefsky6551fbd2013-02-28 16:28:41 +0100902 lghi %r14,__LC_GPREGS_SAVE_AREA+64
903 stmg %r0,%r7,__PT_R0(%r11)
904 mvc __PT_R8(64,%r11),0(%r14)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100905 stmg %r8,%r9,__PT_PSW(%r11)
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +0200906 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100907 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
908 lgr %r2,%r11 # pass pointer to pt_regs
Heiko Carstens77fa2242005-06-25 14:55:30 -0700909 brasl %r14,s390_do_machine_check
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100910 tm __PT_PSW+1(%r11),0x01 # returning to user ?
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100911 jno .Lmcck_return
Heiko Carstens77fa2242005-06-25 14:55:30 -0700912 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100913 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
914 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
915 la %r11,STACK_FRAME_OVERHEAD(%r1)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700916 lgr %r15,%r1
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100917 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
Hendrik Brueckner83abeff2015-10-01 17:02:48 +0200918 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100919 jno .Lmcck_return
Heiko Carstens1f194a42006-07-03 00:24:46 -0700920 TRACE_IRQS_OFF
Heiko Carstens77fa2242005-06-25 14:55:30 -0700921 brasl %r14,s390_handle_mcck
Heiko Carstens1f194a42006-07-03 00:24:46 -0700922 TRACE_IRQS_ON
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100923.Lmcck_return:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100924 lg %r14,__LC_VDSO_PER_CPU
925 lmg %r0,%r10,__PT_R0(%r11)
926 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200927 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
928 jno 0f
929 stpt __LC_EXIT_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100930 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
9310: lmg %r11,%r15,__PT_R11(%r11)
932 lpswe __LC_RETURN_MCCK_PSW
933
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100934.Lmcck_panic:
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100935 lg %r15,__LC_PANIC_STACK
Martin Schwidefsky2acb94f2015-06-22 17:28:14 +0200936 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100937 j .Lmcck_skip
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Michael Holzheu7dd6b332011-08-03 16:44:19 +0200939#
940# PSW restart interrupt handler
941#
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400942ENTRY(restart_int_handler)
Christian Borntraegere22cf8c2015-10-06 18:06:15 +0200943 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
944 jz 0f
945 .insn s,0xb2800000,__LC_LPP
9460: stg %r15,__LC_SAVE_AREA_RESTART
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400947 lg %r15,__LC_RESTART_STACK
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100948 aghi %r15,-__PT_SIZE # create pt_regs on stack
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400949 xc 0(__PT_SIZE,%r15),0(%r15)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100950 stmg %r0,%r14,__PT_R0(%r15)
951 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
952 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400953 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
954 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
Heiko Carstensfbe76562012-06-05 09:59:52 +0200955 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu
956 lg %r2,__LC_RESTART_DATA
957 lg %r3,__LC_RESTART_SOURCE
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400958 ltgr %r3,%r3 # test source cpu address
959 jm 1f # negative -> skip source stop
Heiko Carstenseb546192012-06-04 15:05:43 +02009600: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400961 brc 10,0b # wait for status stored
9621: basr %r14,%r1 # call function
963 stap __SF_EMPTY(%r15) # store cpu address
964 llgh %r3,__SF_EMPTY(%r15)
Heiko Carstenseb546192012-06-04 15:05:43 +02009652: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -0400966 brc 2,2b
9673: j 3b
Michael Holzheu7dd6b332011-08-03 16:44:19 +0200968
Martin Schwidefsky860dba42011-01-05 12:47:25 +0100969 .section .kprobes.text, "ax"
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971#ifdef CONFIG_CHECK_STACK
972/*
973 * The synchronous or the asynchronous stack overflowed. We are dead.
974 * No need to properly save the registers, we are going to panic anyway.
975 * Setup a pt_regs so that show_trace can provide a good call trace.
976 */
977stack_overflow:
Martin Schwidefskydc7ee002013-04-24 10:20:43 +0200978 lg %r15,__LC_PANIC_STACK # change to panic stack
979 la %r11,STACK_FRAME_OVERHEAD(%r15)
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100980 stmg %r0,%r7,__PT_R0(%r11)
981 stmg %r8,%r9,__PT_PSW(%r11)
982 mvc __PT_R8(64,%r11),0(%r14)
983 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
Martin Schwidefskyc5328902011-12-27 11:27:15 +0100984 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
985 lgr %r2,%r11 # pass pointer to pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 jg kernel_stack_overflow
987#endif
988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989cleanup_critical:
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +0200990#if IS_ENABLED(CONFIG_KVM)
991 clg %r9,BASED(.Lcleanup_table_sie) # .Lsie_gmap
992 jl 0f
993 clg %r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done
994 jl .Lcleanup_sie
995#endif
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100996 clg %r9,BASED(.Lcleanup_table) # system_call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 jl 0f
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +0100998 clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc
999 jl .Lcleanup_system_call
1000 clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 jl 0f
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001002 clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore
1003 jl .Lcleanup_sysc_tif
1004 clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done
1005 jl .Lcleanup_sysc_restore
1006 clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif
Martin Schwidefsky63b12242006-06-29 14:58:05 +02001007 jl 0f
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001008 clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore
1009 jl .Lcleanup_io_tif
1010 clg %r9,BASED(.Lcleanup_table+56) # .Lio_done
1011 jl .Lcleanup_io_restore
1012 clg %r9,BASED(.Lcleanup_table+64) # psw_idle
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001013 jl 0f
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001014 clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end
1015 jl .Lcleanup_idle
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001016 clg %r9,BASED(.Lcleanup_table+80) # save_fpu_regs
1017 jl 0f
1018 clg %r9,BASED(.Lcleanup_table+88) # .Lsave_fpu_regs_end
1019 jl .Lcleanup_save_fpu_regs
1020 clg %r9,BASED(.Lcleanup_table+96) # load_fpu_regs
1021 jl 0f
1022 clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end
1023 jl .Lcleanup_load_fpu_regs
Martin Schwidefskyc5328902011-12-27 11:27:15 +010010240: br %r14
1025
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02001026 .align 8
1027.Lcleanup_table:
1028 .quad system_call
1029 .quad .Lsysc_do_svc
1030 .quad .Lsysc_tif
1031 .quad .Lsysc_restore
1032 .quad .Lsysc_done
1033 .quad .Lio_tif
1034 .quad .Lio_restore
1035 .quad .Lio_done
1036 .quad psw_idle
1037 .quad .Lpsw_idle_end
1038 .quad save_fpu_regs
1039 .quad .Lsave_fpu_regs_end
1040 .quad load_fpu_regs
1041 .quad .Lload_fpu_regs_end
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02001042
1043#if IS_ENABLED(CONFIG_KVM)
1044.Lcleanup_table_sie:
1045 .quad .Lsie_gmap
1046 .quad .Lsie_done
1047
1048.Lcleanup_sie:
1049 lg %r9,__SF_EMPTY(%r15) # get control block pointer
Christian Borntraegere22cf8c2015-10-06 18:06:15 +02001050 ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02001051 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
1052 larl %r9,sie_exit # skip forward to sie_exit
1053 br %r14
1054#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001056.Lcleanup_system_call:
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001057 # check if stpt has been executed
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001058 clg %r9,BASED(.Lcleanup_system_call_insn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 jh 0f
1060 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001061 cghi %r11,__LC_SAVE_AREA_ASYNC
Martin Schwidefsky63779812010-05-17 10:00:03 +02001062 je 0f
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001063 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
10640: # check if stmg has been executed
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001065 clg %r9,BASED(.Lcleanup_system_call_insn+8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 jh 0f
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001067 mvc __LC_SAVE_AREA_SYNC(64),0(%r11)
10680: # check if base register setup + TIF bit load has been done
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001069 clg %r9,BASED(.Lcleanup_system_call_insn+16)
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001070 jhe 0f
1071 # set up saved registers r10 and r12
1072 stg %r10,16(%r11) # r10 last break
1073 stg %r12,32(%r11) # r12 thread-info pointer
10740: # check if the user time update has been done
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001075 clg %r9,BASED(.Lcleanup_system_call_insn+24)
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001076 jh 0f
1077 lg %r15,__LC_EXIT_TIMER
1078 slg %r15,__LC_SYNC_ENTER_TIMER
1079 alg %r15,__LC_USER_TIMER
1080 stg %r15,__LC_USER_TIMER
10810: # check if the system time update has been done
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001082 clg %r9,BASED(.Lcleanup_system_call_insn+32)
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001083 jh 0f
1084 lg %r15,__LC_LAST_UPDATE_TIMER
1085 slg %r15,__LC_EXIT_TIMER
1086 alg %r15,__LC_SYSTEM_TIMER
1087 stg %r15,__LC_SYSTEM_TIMER
10880: # update accounting time stamp
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001090 # do LAST_BREAK
1091 lg %r9,16(%r11)
1092 srag %r9,%r9,23
Martin Schwidefsky86f25522010-05-17 10:00:05 +02001093 jz 0f
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001094 mvc __TI_last_break(8,%r12),16(%r11)
10950: # set up saved register r11
1096 lg %r15,__LC_KERNEL_STACK
Martin Schwidefskydc7ee002013-04-24 10:20:43 +02001097 la %r9,STACK_FRAME_OVERHEAD(%r15)
1098 stg %r9,24(%r11) # r11 pt_regs pointer
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001099 # fill pt_regs
Martin Schwidefskydc7ee002013-04-24 10:20:43 +02001100 mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
1101 stmg %r0,%r7,__PT_R0(%r9)
1102 mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW
1103 mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC
Martin Schwidefskyd3a73ac2014-04-15 12:55:07 +02001104 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
1105 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001106 # setup saved register r15
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001107 stg %r15,56(%r11) # r15 stack pointer
1108 # set new psw address and exit
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001109 larl %r9,.Lsysc_do_svc
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 br %r14
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001111.Lcleanup_system_call_insn:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001112 .quad system_call
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001113 .quad .Lsysc_stmg
1114 .quad .Lsysc_per
Martin Schwidefskya359bb12015-06-22 17:27:48 +02001115 .quad .Lsysc_vtime+36
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001116 .quad .Lsysc_vtime+42
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001118.Lcleanup_sysc_tif:
1119 larl %r9,.Lsysc_tif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 br %r14
1121
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001122.Lcleanup_sysc_restore:
1123 clg %r9,BASED(.Lcleanup_sysc_restore_insn)
Martin Schwidefsky63779812010-05-17 10:00:03 +02001124 je 0f
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001125 lg %r9,24(%r11) # get saved pointer to pt_regs
1126 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
1127 mvc 0(64,%r11),__PT_R8(%r9)
1128 lmg %r0,%r7,__PT_R0(%r9)
11290: lmg %r8,%r9,__LC_RETURN_PSW
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 br %r14
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001131.Lcleanup_sysc_restore_insn:
1132 .quad .Lsysc_done - 4
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001134.Lcleanup_io_tif:
1135 larl %r9,.Lio_tif
Martin Schwidefsky176b1802010-04-09 13:43:00 +02001136 br %r14
1137
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001138.Lcleanup_io_restore:
1139 clg %r9,BASED(.Lcleanup_io_restore_insn)
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001140 je 0f
1141 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
1142 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001143 mvc 0(64,%r11),__PT_R8(%r9)
1144 lmg %r0,%r7,__PT_R0(%r9)
11450: lmg %r8,%r9,__LC_RETURN_PSW
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001146 br %r14
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001147.Lcleanup_io_restore_insn:
1148 .quad .Lio_done - 4
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001149
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001150.Lcleanup_idle:
Martin Schwidefsky419123f2015-11-19 11:09:45 +01001151 ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001152 # copy interrupt clock & cpu timer
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001153 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
1154 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001155 cghi %r11,__LC_SAVE_AREA_ASYNC
1156 je 0f
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001157 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
1158 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -040011590: # check if stck & stpt have been executed
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001160 clg %r9,BASED(.Lcleanup_idle_insn)
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001161 jhe 1f
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001162 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
1163 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
Martin Schwidefsky72d38b12015-09-18 16:41:36 +020011641: # calculate idle cycles
1165#ifdef CONFIG_SMP
1166 clg %r9,BASED(.Lcleanup_idle_insn)
1167 jl 3f
1168 larl %r1,smp_cpu_mtid
1169 llgf %r1,0(%r1)
1170 ltgr %r1,%r1
1171 jz 3f
1172 .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15)
1173 larl %r3,mt_cycles
1174 ag %r3,__LC_PERCPU_OFFSET
1175 la %r4,__SF_EMPTY+16(%r15)
11762: lg %r0,0(%r3)
1177 slg %r0,0(%r4)
1178 alg %r0,64(%r4)
1179 stg %r0,0(%r3)
1180 la %r3,8(%r3)
1181 la %r4,8(%r4)
1182 brct %r1,2b
1183#endif
11843: # account system time going idle
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001185 lg %r9,__LC_STEAL_TIMER
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001186 alg %r9,__CLOCK_IDLE_ENTER(%r2)
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001187 slg %r9,__LC_LAST_UPDATE_CLOCK
1188 stg %r9,__LC_STEAL_TIMER
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001189 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001190 lg %r9,__LC_SYSTEM_TIMER
1191 alg %r9,__LC_LAST_UPDATE_TIMER
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001192 slg %r9,__TIMER_IDLE_ENTER(%r2)
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001193 stg %r9,__LC_SYSTEM_TIMER
Martin Schwidefsky27f6b412012-07-20 11:15:08 +02001194 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001195 # prepare return psw
Martin Schwidefsky0587d402013-08-23 14:45:58 +02001196 nihh %r8,0xfcfd # clear irq & wait state bits
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001197 lg %r9,48(%r11) # return from psw_idle
1198 br %r14
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001199.Lcleanup_idle_insn:
1200 .quad .Lpsw_idle_lpsw
Martin Schwidefsky4c1051e2012-03-11 11:59:27 -04001201
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001202.Lcleanup_save_fpu_regs:
Martin Schwidefskye370e472016-03-10 09:52:55 +01001203 larl %r9,save_fpu_regs
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001204 br %r14
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001205
1206.Lcleanup_load_fpu_regs:
Martin Schwidefskye370e472016-03-10 09:52:55 +01001207 larl %r9,load_fpu_regs
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001208 br %r14
Hendrik Brueckner9977e882015-06-10 12:53:42 +02001209
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210/*
1211 * Integer constants
1212 */
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001213 .align 8
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214.Lcritical_start:
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001215 .quad .L__critical_start
Martin Schwidefskyc5328902011-12-27 11:27:15 +01001216.Lcritical_length:
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001217 .quad .L__critical_end - .L__critical_start
Heiko Carstens61aa4882013-11-01 10:08:20 +01001218#if IS_ENABLED(CONFIG_KVM)
Martin Schwidefskyd0fc4102015-06-22 17:26:40 +02001219.Lsie_critical_start:
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001220 .quad .Lsie_gmap
Martin Schwidefsky7c470532013-05-17 14:41:37 +02001221.Lsie_critical_length:
Martin Schwidefsky86ed42f2014-12-03 17:00:08 +01001222 .quad .Lsie_done - .Lsie_gmap
Martin Schwidefsky603d1a52011-07-24 10:48:18 +02001223#endif
1224
Heiko Carstensa876cb32015-02-13 14:44:29 +01001225 .section .rodata, "a"
1226#define SYSCALL(esame,emu) .long esame
Heiko Carstens9bf12262009-06-12 10:26:47 +02001227 .globl sys_call_table
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228sys_call_table:
1229#include "syscalls.S"
1230#undef SYSCALL
1231
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -08001232#ifdef CONFIG_COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
Heiko Carstensa876cb32015-02-13 14:44:29 +01001234#define SYSCALL(esame,emu) .long emu
Martin Schwidefsky61649882013-04-24 12:58:39 +02001235 .globl sys_call_table_emu
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236sys_call_table_emu:
1237#include "syscalls.S"
1238#undef SYSCALL
1239#endif