1/* 2 * S390 low-level entry points. 3 * 4 * Copyright IBM Corp. 1999, 2012 5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 6 * Hartmut Penner (hp@de.ibm.com), 7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 8 * Heiko Carstens <heiko.carstens@de.ibm.com> 9 */ 10 11#include <linux/init.h> 12#include <linux/linkage.h> 13#include <asm/processor.h> 14#include <asm/cache.h> 15#include <asm/errno.h> 16#include <asm/ptrace.h> 17#include <asm/thread_info.h> 18#include <asm/asm-offsets.h> 19#include <asm/unistd.h> 20#include <asm/page.h> 21#include <asm/sigp.h> 22#include <asm/irq.h> 23#include <asm/vx-insn.h> 24#include <asm/setup.h> 25#include <asm/nmi.h> 26 27__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 43 44STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 45STACK_SIZE = 1 << STACK_SHIFT 46STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE 47 48_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 49 _TIF_UPROBE) 50_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 51 _TIF_SYSCALL_TRACEPOINT) 52_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE | _CIF_FPU) 53_PIF_WORK = (_PIF_PER_TRAP) 54 55#define BASED(name) name-cleanup_critical(%r13) 56 57 .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 79 .macro CHECK_STACK stacksize,savearea 80#ifdef CONFIG_CHECK_STACK 81 tml %r15,\stacksize - CONFIG_STACK_GUARD 82 lghi %r14,\savearea 83 jz stack_overflow 84#endif 85 .endm 86 87 .macro SWITCH_ASYNC savearea,timer 88 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) 93 jhe 0f 94 lghi %r11,\savearea # inside critical section, do cleanup 95 brasl %r14,cleanup_critical 96 tmhh %r8,0x0001 # retest problem state after cleanup 97 jnz 1f 980: lg %r14,__LC_ASYNC_STACK # are we already on the async stack? 99 slgr %r14,%r15 100 srag %r14,%r14,STACK_SHIFT 101 jnz 2f 102 CHECK_STACK 1<<STACK_SHIFT,\savearea 103 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 104 j 3f 1051: LAST_BREAK %r14 106 UPDATE_VTIME %r14,%r15,\timer 1072: lg %r15,__LC_ASYNC_STACK # load async stack 1083: la %r11,STACK_FRAME_OVERHEAD(%r15) 109 .endm 110 111 .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 120 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer 121 .endm 122 123 .macro LAST_BREAK scratch 124 srag \scratch,%r10,23 125 jz .+10 126 stg %r10,__TI_last_break(%r12) 127 .endm 128 129 .macro REENABLE_IRQS 130 stg %r8,__LC_RETURN_PSW 131 ni __LC_RETURN_PSW,0xbf 132 ssm __LC_RETURN_PSW 133 .endm 134 135 .macro STCK savearea 136#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 137 .insn s,0xb27c0000,\savearea # store clock fast 138#else 139 .insn s,0xb2050000,\savearea # store clock 140#endif 141 .endm 142 143 /* 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 164 165 .section .kprobes.text, "ax" 166 167/* 168 * Scheduler resume function, called by switch_to 169 * gpr2 = (task_struct *) prev 170 * gpr3 = (task_struct *) next 171 * Returns: 172 * gpr2 = prev 173 */ 174ENTRY(__switch_to) 175 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 176 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 183 lgr %r15,%r5 184 aghi %r15,STACK_INIT # end of kernel stack of next 185 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 188 lg %r15,__THREAD_ksp(%r1) # load kernel stack of next 189 /* c4 is used in guest detection: arch/s390/kernel/perf_cpum_sf.c */ 190 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 191 mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next 192 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 193 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP 194 bzr %r14 195 .insn s,0xb2800000,__LC_LPP # set program parameter 196 br %r14 197 198.L__critical_start: 199 200#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 210 xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0 211 TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ? 212 jno .Lsie_load_guest_gprs 213 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 225 TSTMSK __LC_CPU_FLAGS,_CIF_FPU 226 jo .Lsie_skip # exit if fp/vx regs changed 227 sie 0(%r14) 228.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 244 lg %r2,__SF_EMPTY+16(%r15) # return exit reason code 245 br %r14 246.Lsie_fault: 247 lghi %r14,-EFAULT 248 stg %r14,__SF_EMPTY+16(%r15) # set exit reason code 249 j sie_exit 250 251 EX_TABLE(.Lrewind_pad,.Lsie_fault) 252 EX_TABLE(sie_exit,.Lsie_fault) 253#endif 254 255/* 256 * SVC interrupt handler routine. System calls are synchronous events and 257 * are executed with interrupts enabled. 258 */ 259 260ENTRY(system_call) 261 stpt __LC_SYNC_ENTER_TIMER 262.Lsysc_stmg: 263 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 264 lg %r10,__LC_LAST_BREAK 265 lg %r12,__LC_THREAD_INFO 266 lghi %r14,_PIF_SYSCALL 267.Lsysc_per: 268 lg %r15,__LC_KERNEL_STACK 269 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs 270 LAST_BREAK %r13 271.Lsysc_vtime: 272 UPDATE_VTIME %r10,%r13,__LC_SYNC_ENTER_TIMER 273 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 276 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC 277 stg %r14,__PT_FLAGS(%r11) 278.Lsysc_do_svc: 279 lg %r10,__TI_sysc_table(%r12) # address of system call table 280 llgh %r8,__PT_INT_CODE+2(%r11) 281 slag %r8,%r8,2 # shift and test for svc 0 282 jnz .Lsysc_nr_ok 283 # svc 0: system call number in %r1 284 llgfr %r1,%r1 # clear high word in r1 285 cghi %r1,NR_syscalls 286 jnl .Lsysc_nr_ok 287 sth %r1,__PT_INT_CODE+2(%r11) 288 slag %r8,%r1,2 289.Lsysc_nr_ok: 290 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. 294 TSTMSK __TI_flags(%r12),_TIF_TRACE 295 jnz .Lsysc_tracesys 296 basr %r14,%r9 # call sys_xxxx 297 stg %r2,__PT_R2(%r11) # store return value 298 299.Lsysc_return: 300 LOCKDEP_SYS_EXIT 301.Lsysc_tif: 302 TSTMSK __PT_FLAGS(%r11),_PIF_WORK 303 jnz .Lsysc_work 304 TSTMSK __TI_flags(%r12),_TIF_WORK 305 jnz .Lsysc_work # check for work 306 TSTMSK __LC_CPU_FLAGS,_CIF_WORK 307 jnz .Lsysc_work 308.Lsysc_restore: 309 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 316.Lsysc_done: 317 318# 319# One of the work bits is on. Find out which one. 320# 321.Lsysc_work: 322 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 323 jo .Lsysc_mcck_pending 324 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 325 jo .Lsysc_reschedule 326#ifdef CONFIG_UPROBES 327 TSTMSK __TI_flags(%r12),_TIF_UPROBE 328 jo .Lsysc_uprobe_notify 329#endif 330 TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP 331 jo .Lsysc_singlestep 332 TSTMSK __TI_flags(%r12),_TIF_SIGPENDING 333 jo .Lsysc_sigpending 334 TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME 335 jo .Lsysc_notify_resume 336 TSTMSK __LC_CPU_FLAGS,_CIF_FPU 337 jo .Lsysc_vxrs 338 TSTMSK __LC_CPU_FLAGS,_CIF_ASCE 339 jo .Lsysc_uaccess 340 j .Lsysc_return # beware of critical section cleanup 341 342# 343# _TIF_NEED_RESCHED is set, call schedule 344# 345.Lsysc_reschedule: 346 larl %r14,.Lsysc_return 347 jg schedule 348 349# 350# _CIF_MCCK_PENDING is set, call handler 351# 352.Lsysc_mcck_pending: 353 larl %r14,.Lsysc_return 354 jg s390_handle_mcck # TIF bit will be cleared by handler 355 356# 357# _CIF_ASCE is set, load user space asce 358# 359.Lsysc_uaccess: 360 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 361 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 362 j .Lsysc_return 363 364# 365# 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# 372# _TIF_SIGPENDING is set, call do_signal 373# 374.Lsysc_sigpending: 375 lgr %r2,%r11 # pass pointer to pt_regs 376 brasl %r14,do_signal 377 TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL 378 jno .Lsysc_return 379 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments 380 lg %r10,__TI_sysc_table(%r12) # address of system call table 381 lghi %r8,0 # svc 0 returns -ENOSYS 382 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number 383 cghi %r1,NR_syscalls 384 jnl .Lsysc_nr_ok # invalid svc number -> do svc 0 385 slag %r8,%r1,2 386 j .Lsysc_nr_ok # restart svc 387 388# 389# _TIF_NOTIFY_RESUME is set, call do_notify_resume 390# 391.Lsysc_notify_resume: 392 lgr %r2,%r11 # pass pointer to pt_regs 393 larl %r14,.Lsysc_return 394 jg do_notify_resume 395 396# 397# _TIF_UPROBE is set, call uprobe_notify_resume 398# 399#ifdef CONFIG_UPROBES 400.Lsysc_uprobe_notify: 401 lgr %r2,%r11 # pass pointer to pt_regs 402 larl %r14,.Lsysc_return 403 jg uprobe_notify_resume 404#endif 405 406# 407# _PIF_PER_TRAP is set, call do_per_trap 408# 409.Lsysc_singlestep: 410 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP 411 lgr %r2,%r11 # pass pointer to pt_regs 412 larl %r14,.Lsysc_return 413 jg do_per_trap 414 415# 416# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 417# and after the system call 418# 419.Lsysc_tracesys: 420 lgr %r2,%r11 # pass pointer to pt_regs 421 la %r3,0 422 llgh %r0,__PT_INT_CODE+2(%r11) 423 stg %r0,__PT_R2(%r11) 424 brasl %r14,do_syscall_trace_enter 425 lghi %r0,NR_syscalls 426 clgr %r0,%r2 427 jnh .Lsysc_tracenogo 428 sllg %r8,%r2,2 429 lgf %r9,0(%r8,%r10) 430.Lsysc_tracego: 431 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 436.Lsysc_tracenogo: 437 TSTMSK __TI_flags(%r12),_TIF_TRACE 438 jz .Lsysc_return 439 lgr %r2,%r11 # pass pointer to pt_regs 440 larl %r14,.Lsysc_return 441 jg do_syscall_trace_exit 442 443# 444# a new process exits the kernel with ret_from_fork 445# 446ENTRY(ret_from_fork) 447 la %r11,STACK_FRAME_OVERHEAD(%r15) 448 lg %r12,__LC_THREAD_INFO 449 brasl %r14,schedule_tail 450 TRACE_IRQS_ON 451 ssm __LC_SVC_NEW_PSW # reenable interrupts 452 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? 453 jne .Lsysc_tracenogo 454 # it's a kernel thread 455 lmg %r9,%r10,__PT_R9(%r11) # load gprs 456ENTRY(kernel_thread_starter) 457 la %r2,0(%r10) 458 basr %r14,%r9 459 j .Lsysc_tracenogo 460 461/* 462 * Program check handler routine 463 */ 464 465ENTRY(pgm_check_handler) 466 stpt __LC_SYNC_ENTER_TIMER 467 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 468 lg %r10,__LC_LAST_BREAK 469 lg %r12,__LC_THREAD_INFO 470 larl %r13,cleanup_critical 471 lmg %r8,%r9,__LC_PGM_OLD_PSW 472 tmhh %r8,0x0001 # test problem state bit 473 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 484 tm __LC_PGM_ILC+3,0x80 # check for per exception 485 jnz .Lpgm_svcper # -> single stepped svc 4861: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC 487 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 488 j 3f 4892: LAST_BREAK %r14 490 UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER 491 lg %r15,__LC_KERNEL_STACK 492 lg %r14,__TI_task(%r12) 493 aghi %r14,__TASK_thread # pointer to thread_struct 494 lghi %r13,__LC_PGM_TDB 495 tm __LC_PGM_ILC+2,0x02 # check for transaction abort 496 jz 3f 497 mvc __THREAD_trap_tdb(256,%r14),0(%r13) 4983: la %r11,STACK_FRAME_OVERHEAD(%r15) 499 stmg %r0,%r7,__PT_R0(%r11) 500 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 501 stmg %r8,%r9,__PT_PSW(%r11) 502 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC 503 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE 504 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 505 stg %r10,__PT_ARGS(%r11) 506 tm __LC_PGM_ILC+3,0x80 # check for per exception 507 jz 4f 508 tmhh %r8,0x0001 # kernel per event ? 509 jz .Lpgm_kprobe 510 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP 511 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS 512 mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE 513 mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID 5144: REENABLE_IRQS 515 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 516 larl %r1,pgm_check_table 517 llgh %r10,__PT_INT_CODE+2(%r11) 518 nill %r10,0x007f 519 sll %r10,2 520 je .Lpgm_return 521 lgf %r1,0(%r10,%r1) # load address of handler routine 522 lgr %r2,%r11 # pass pointer to pt_regs 523 basr %r14,%r1 # branch to interrupt-handler 524.Lpgm_return: 525 LOCKDEP_SYS_EXIT 526 tm __PT_PSW+1(%r11),0x01 # returning to user ? 527 jno .Lsysc_restore 528 j .Lsysc_tif 529 530# 531# PER event in supervisor state, must be kprobes 532# 533.Lpgm_kprobe: 534 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 538 j .Lpgm_return 539 540# 541# single stepped system call 542# 543.Lpgm_svcper: 544 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW 545 larl %r14,.Lsysc_per 546 stg %r14,__LC_RETURN_PSW+8 547 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP 548 lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs 549 550/* 551 * IO interrupt handler routine 552 */ 553ENTRY(io_int_handler) 554 STCK __LC_INT_CLOCK 555 stpt __LC_ASYNC_ENTER_TIMER 556 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 557 lg %r10,__LC_LAST_BREAK 558 lg %r12,__LC_THREAD_INFO 559 larl %r13,cleanup_critical 560 lmg %r8,%r9,__LC_IO_OLD_PSW 561 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER 562 stmg %r0,%r7,__PT_R0(%r11) 563 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 564 stmg %r8,%r9,__PT_PSW(%r11) 565 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 566 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 567 TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ 568 jo .Lio_restore 569 TRACE_IRQS_OFF 570 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 571.Lio_loop: 572 lgr %r2,%r11 # pass pointer to pt_regs 573 lghi %r3,IO_INTERRUPT 574 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? 575 jz .Lio_call 576 lghi %r3,THIN_INTERRUPT 577.Lio_call: 578 brasl %r14,do_IRQ 579 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR 580 jz .Lio_return 581 tpi 0 582 jz .Lio_return 583 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 584 j .Lio_loop 585.Lio_return: 586 LOCKDEP_SYS_EXIT 587 TRACE_IRQS_ON 588.Lio_tif: 589 TSTMSK __TI_flags(%r12),_TIF_WORK 590 jnz .Lio_work # there is work to do (signals etc.) 591 TSTMSK __LC_CPU_FLAGS,_CIF_WORK 592 jnz .Lio_work 593.Lio_restore: 594 lg %r14,__LC_VDSO_PER_CPU 595 lmg %r0,%r10,__PT_R0(%r11) 596 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 597 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 601.Lio_done: 602 603# 604# There is work todo, find out in which context we have been interrupted: 605# 1) if we return to user space we can do all _TIF_WORK work 606# 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. 611# 612.Lio_work: 613 tm __PT_PSW+1(%r11),0x01 # returning to user ? 614 jo .Lio_work_user # yes -> do resched & signal 615#ifdef CONFIG_PREEMPT 616 # check for preemptive scheduling 617 icm %r0,15,__TI_precount(%r12) 618 jnz .Lio_restore # preemption is disabled 619 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 620 jno .Lio_restore 621 # switch to kernel stack 622 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) 627 lgr %r15,%r1 628 # TRACE_IRQS_ON already done at .Lio_return, call 629 # TRACE_IRQS_OFF to keep things symmetrical 630 TRACE_IRQS_OFF 631 brasl %r14,preempt_schedule_irq 632 j .Lio_return 633#else 634 j .Lio_restore 635#endif 636 637# 638# Need to do work before returning to userspace, switch to kernel stack 639# 640.Lio_work_user: 641 lg %r1,__LC_KERNEL_STACK 642 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) 645 lgr %r15,%r1 646 647# 648# One of the work bits is on. Find out which one. 649# 650.Lio_work_tif: 651 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 652 jo .Lio_mcck_pending 653 TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 654 jo .Lio_reschedule 655 TSTMSK __TI_flags(%r12),_TIF_SIGPENDING 656 jo .Lio_sigpending 657 TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME 658 jo .Lio_notify_resume 659 TSTMSK __LC_CPU_FLAGS,_CIF_FPU 660 jo .Lio_vxrs 661 TSTMSK __LC_CPU_FLAGS,_CIF_ASCE 662 jo .Lio_uaccess 663 j .Lio_return # beware of critical section cleanup 664 665# 666# _CIF_MCCK_PENDING is set, call handler 667# 668.Lio_mcck_pending: 669 # TRACE_IRQS_ON already done at .Lio_return 670 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler 671 TRACE_IRQS_OFF 672 j .Lio_return 673 674# 675# _CIF_ASCE is set, load user space asce 676# 677.Lio_uaccess: 678 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 679 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 680 j .Lio_return 681 682# 683# 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# 690# _TIF_NEED_RESCHED is set, call schedule 691# 692.Lio_reschedule: 693 # TRACE_IRQS_ON already done at .Lio_return 694 ssm __LC_SVC_NEW_PSW # reenable interrupts 695 brasl %r14,schedule # call scheduler 696 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 697 TRACE_IRQS_OFF 698 j .Lio_return 699 700# 701# _TIF_SIGPENDING or is set, call do_signal 702# 703.Lio_sigpending: 704 # TRACE_IRQS_ON already done at .Lio_return 705 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 709 TRACE_IRQS_OFF 710 j .Lio_return 711 712# 713# _TIF_NOTIFY_RESUME or is set, call do_notify_resume 714# 715.Lio_notify_resume: 716 # TRACE_IRQS_ON already done at .Lio_return 717 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 721 TRACE_IRQS_OFF 722 j .Lio_return 723 724/* 725 * External interrupt handler routine 726 */ 727ENTRY(ext_int_handler) 728 STCK __LC_INT_CLOCK 729 stpt __LC_ASYNC_ENTER_TIMER 730 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 731 lg %r10,__LC_LAST_BREAK 732 lg %r12,__LC_THREAD_INFO 733 larl %r13,cleanup_critical 734 lmg %r8,%r9,__LC_EXT_OLD_PSW 735 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER 736 stmg %r0,%r7,__PT_R0(%r11) 737 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 738 stmg %r8,%r9,__PT_PSW(%r11) 739 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) 743 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 744 TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ 745 jo .Lio_restore 746 TRACE_IRQS_OFF 747 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 748 lgr %r2,%r11 # pass pointer to pt_regs 749 lghi %r3,EXT_INTERRUPT 750 brasl %r14,do_IRQ 751 j .Lio_return 752 753/* 754 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. 755 */ 756ENTRY(psw_idle) 757 stg %r3,__SF_EMPTY(%r15) 758 larl %r1,.Lpsw_idle_lpsw+4 759 stg %r1,__SF_EMPTY+8(%r15) 760#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 768 oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT 769 STCK __CLOCK_IDLE_ENTER(%r2) 770 stpt __TIMER_IDLE_ENTER(%r2) 771.Lpsw_idle_lpsw: 772 lpswe __SF_EMPTY(%r15) 773 br %r14 774.Lpsw_idle_end: 775 776/* 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. 782 */ 783ENTRY(save_fpu_regs) 784 lg %r2,__LC_CURRENT 785 aghi %r2,__TASK_thread 786 TSTMSK __LC_CPU_FLAGS,_CIF_FPU 787 bor %r14 788 stfpc __THREAD_FPU_fpc(%r2) 789.Lsave_fpu_regs_fpc_end: 790 lg %r3,__THREAD_FPU_regs(%r2) 791 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX 792 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: 819 820/* 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. 824 * 825 * There are special calling conventions to fit into sysc and io return work: 826 * %r15: <kernel stack> 827 * The function requires: 828 * %r4 829 */ 830load_fpu_regs: 831 lg %r4,__LC_CURRENT 832 aghi %r4,__TASK_thread 833 TSTMSK __LC_CPU_FLAGS,_CIF_FPU 834 bnor %r14 835 lfpc __THREAD_FPU_fpc(%r4) 836 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX 837 lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area 838 jz .Lload_fpu_regs_fp # -> no VX, load FP regs 839.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 844.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: 865 866.L__critical_end: 867 868/* 869 * Machine check handler routines 870 */ 871ENTRY(mcck_int_handler) 872 STCK __LC_MCCK_CLOCK 873 la %r1,4095 # revalidate r1 874 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer 875 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs 876 lg %r10,__LC_LAST_BREAK 877 lg %r12,__LC_THREAD_INFO 878 larl %r13,cleanup_critical 879 lmg %r8,%r9,__LC_MCK_OLD_PSW 880 TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE 881 jo .Lmcck_panic # yes -> rest of mcck code invalid 882 lghi %r14,__LC_CPU_TIMER_SAVE_AREA 883 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 884 TSTMSK __LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID 885 jo 3f 886 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 891 jl 1f 892 la %r14,__LC_EXIT_TIMER 8931: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 894 jl 2f 895 la %r14,__LC_LAST_UPDATE_TIMER 8962: spt 0(%r14) 897 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 8983: TSTMSK __LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID) 899 jno .Lmcck_panic # no -> skip cleanup critical 900 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER 901.Lmcck_skip: 902 lghi %r14,__LC_GPREGS_SAVE_AREA+64 903 stmg %r0,%r7,__PT_R0(%r11) 904 mvc __PT_R8(64,%r11),0(%r14) 905 stmg %r8,%r9,__PT_PSW(%r11) 906 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 907 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 908 lgr %r2,%r11 # pass pointer to pt_regs 909 brasl %r14,s390_do_machine_check 910 tm __PT_PSW+1(%r11),0x01 # returning to user ? 911 jno .Lmcck_return 912 lg %r1,__LC_KERNEL_STACK # switch to kernel stack 913 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) 916 lgr %r15,%r1 917 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off 918 TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 919 jno .Lmcck_return 920 TRACE_IRQS_OFF 921 brasl %r14,s390_handle_mcck 922 TRACE_IRQS_ON 923.Lmcck_return: 924 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 927 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 928 jno 0f 929 stpt __LC_EXIT_TIMER 930 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 9310: lmg %r11,%r15,__PT_R11(%r11) 932 lpswe __LC_RETURN_MCCK_PSW 933 934.Lmcck_panic: 935 lg %r15,__LC_PANIC_STACK 936 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 937 j .Lmcck_skip 938 939# 940# PSW restart interrupt handler 941# 942ENTRY(restart_int_handler) 943 TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP 944 jz 0f 945 .insn s,0xb2800000,__LC_LPP 9460: stg %r15,__LC_SAVE_AREA_RESTART 947 lg %r15,__LC_RESTART_STACK 948 aghi %r15,-__PT_SIZE # create pt_regs on stack 949 xc 0(__PT_SIZE,%r15),0(%r15) 950 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 953 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack 954 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) 955 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu 956 lg %r2,__LC_RESTART_DATA 957 lg %r3,__LC_RESTART_SOURCE 958 ltgr %r3,%r3 # test source cpu address 959 jm 1f # negative -> skip source stop 9600: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu 961 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) 9652: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu 966 brc 2,2b 9673: j 3b 968 969 .section .kprobes.text, "ax" 970 971#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: 978 lg %r15,__LC_PANIC_STACK # change to panic stack 979 la %r11,STACK_FRAME_OVERHEAD(%r15) 980 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 984 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 985 lgr %r2,%r11 # pass pointer to pt_regs 986 jg kernel_stack_overflow 987#endif 988 989cleanup_critical: 990#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 996 clg %r9,BASED(.Lcleanup_table) # system_call 997 jl 0f 998 clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc 999 jl .Lcleanup_system_call 1000 clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif 1001 jl 0f 1002 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 1007 jl 0f 1008 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 1013 jl 0f 1014 clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end 1015 jl .Lcleanup_idle 1016 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 10240: br %r14 1025 1026 .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 1042 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 1050 ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE 1051 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 1052 larl %r9,sie_exit # skip forward to sie_exit 1053 br %r14 1054#endif 1055 1056.Lcleanup_system_call: 1057 # check if stpt has been executed 1058 clg %r9,BASED(.Lcleanup_system_call_insn) 1059 jh 0f 1060 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 1061 cghi %r11,__LC_SAVE_AREA_ASYNC 1062 je 0f 1063 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 10640: # check if stmg has been executed 1065 clg %r9,BASED(.Lcleanup_system_call_insn+8) 1066 jh 0f 1067 mvc __LC_SAVE_AREA_SYNC(64),0(%r11) 10680: # check if base register setup + TIF bit load has been done 1069 clg %r9,BASED(.Lcleanup_system_call_insn+16) 1070 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 1075 clg %r9,BASED(.Lcleanup_system_call_insn+24) 1076 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 1082 clg %r9,BASED(.Lcleanup_system_call_insn+32) 1083 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 1089 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 1090 # do LAST_BREAK 1091 lg %r9,16(%r11) 1092 srag %r9,%r9,23 1093 jz 0f 1094 mvc __TI_last_break(8,%r12),16(%r11) 10950: # set up saved register r11 1096 lg %r15,__LC_KERNEL_STACK 1097 la %r9,STACK_FRAME_OVERHEAD(%r15) 1098 stg %r9,24(%r11) # r11 pt_regs pointer 1099 # fill pt_regs 1100 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 1104 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) 1105 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL 1106 # setup saved register r15 1107 stg %r15,56(%r11) # r15 stack pointer 1108 # set new psw address and exit 1109 larl %r9,.Lsysc_do_svc 1110 br %r14 1111.Lcleanup_system_call_insn: 1112 .quad system_call 1113 .quad .Lsysc_stmg 1114 .quad .Lsysc_per 1115 .quad .Lsysc_vtime+36 1116 .quad .Lsysc_vtime+42 1117 1118.Lcleanup_sysc_tif: 1119 larl %r9,.Lsysc_tif 1120 br %r14 1121 1122.Lcleanup_sysc_restore: 1123 clg %r9,BASED(.Lcleanup_sysc_restore_insn) 1124 je 0f 1125 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 1130 br %r14 1131.Lcleanup_sysc_restore_insn: 1132 .quad .Lsysc_done - 4 1133 1134.Lcleanup_io_tif: 1135 larl %r9,.Lio_tif 1136 br %r14 1137 1138.Lcleanup_io_restore: 1139 clg %r9,BASED(.Lcleanup_io_restore_insn) 1140 je 0f 1141 lg %r9,24(%r11) # get saved r11 pointer to pt_regs 1142 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 1143 mvc 0(64,%r11),__PT_R8(%r9) 1144 lmg %r0,%r7,__PT_R0(%r9) 11450: lmg %r8,%r9,__LC_RETURN_PSW 1146 br %r14 1147.Lcleanup_io_restore_insn: 1148 .quad .Lio_done - 4 1149 1150.Lcleanup_idle: 1151 ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT 1152 # copy interrupt clock & cpu timer 1153 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK 1154 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER 1155 cghi %r11,__LC_SAVE_AREA_ASYNC 1156 je 0f 1157 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK 1158 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER 11590: # check if stck & stpt have been executed 1160 clg %r9,BASED(.Lcleanup_idle_insn) 1161 jhe 1f 1162 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) 1163 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) 11641: # 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 1185 lg %r9,__LC_STEAL_TIMER 1186 alg %r9,__CLOCK_IDLE_ENTER(%r2) 1187 slg %r9,__LC_LAST_UPDATE_CLOCK 1188 stg %r9,__LC_STEAL_TIMER 1189 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) 1190 lg %r9,__LC_SYSTEM_TIMER 1191 alg %r9,__LC_LAST_UPDATE_TIMER 1192 slg %r9,__TIMER_IDLE_ENTER(%r2) 1193 stg %r9,__LC_SYSTEM_TIMER 1194 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) 1195 # prepare return psw 1196 nihh %r8,0xfcfd # clear irq & wait state bits 1197 lg %r9,48(%r11) # return from psw_idle 1198 br %r14 1199.Lcleanup_idle_insn: 1200 .quad .Lpsw_idle_lpsw 1201 1202.Lcleanup_save_fpu_regs: 1203 larl %r9,save_fpu_regs 1204 br %r14 1205 1206.Lcleanup_load_fpu_regs: 1207 larl %r9,load_fpu_regs 1208 br %r14 1209 1210/* 1211 * Integer constants 1212 */ 1213 .align 8 1214.Lcritical_start: 1215 .quad .L__critical_start 1216.Lcritical_length: 1217 .quad .L__critical_end - .L__critical_start 1218#if IS_ENABLED(CONFIG_KVM) 1219.Lsie_critical_start: 1220 .quad .Lsie_gmap 1221.Lsie_critical_length: 1222 .quad .Lsie_done - .Lsie_gmap 1223#endif 1224 1225 .section .rodata, "a" 1226#define SYSCALL(esame,emu) .long esame 1227 .globl sys_call_table 1228sys_call_table: 1229#include "syscalls.S" 1230#undef SYSCALL 1231 1232#ifdef CONFIG_COMPAT 1233 1234#define SYSCALL(esame,emu) .long emu 1235 .globl sys_call_table_emu 1236sys_call_table_emu: 1237#include "syscalls.S" 1238#undef SYSCALL 1239#endif 1240