1/* 2 * arch/s390/kernel/entry.S 3 * S390 low-level entry points. 4 * 5 * Copyright (C) IBM Corp. 1999,2006 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Hartmut Penner (hp@de.ibm.com), 8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 9 * Heiko Carstens <heiko.carstens@de.ibm.com> 10 */ 11 12#include <linux/sys.h> 13#include <linux/linkage.h> 14#include <linux/init.h> 15#include <asm/cache.h> 16#include <asm/errno.h> 17#include <asm/ptrace.h> 18#include <asm/thread_info.h> 19#include <asm/asm-offsets.h> 20#include <asm/unistd.h> 21#include <asm/page.h> 22 23/* 24 * Stack layout for the system_call stack entry. 25 * The first few entries are identical to the user_regs_struct. 26 */ 27SP_PTREGS = STACK_FRAME_OVERHEAD 28SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 29SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 30SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 31SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 32SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 33SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 34SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 35SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 36SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 37SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 38SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 39SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 40SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 41SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 42SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 43SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 44SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 45SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 46SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 47SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC 48SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR 49SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 50 51_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 52 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) 53_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 54 _TIF_MCCK_PENDING) 55_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ 56 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) 57 58STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 59STACK_SIZE = 1 << STACK_SHIFT 60 61#define BASED(name) name-system_call(%r13) 62 63#ifdef CONFIG_TRACE_IRQFLAGS 64 .macro TRACE_IRQS_ON 65 basr %r2,%r0 66 l %r1,BASED(.Ltrace_irq_on_caller) 67 basr %r14,%r1 68 .endm 69 70 .macro TRACE_IRQS_OFF 71 basr %r2,%r0 72 l %r1,BASED(.Ltrace_irq_off_caller) 73 basr %r14,%r1 74 .endm 75#else 76#define TRACE_IRQS_ON 77#define TRACE_IRQS_OFF 78#endif 79 80#ifdef CONFIG_LOCKDEP 81 .macro LOCKDEP_SYS_EXIT 82 tm SP_PSW+1(%r15),0x01 # returning to user ? 83 jz 0f 84 l %r1,BASED(.Llockdep_sys_exit) 85 basr %r14,%r1 860: 87 .endm 88#else 89#define LOCKDEP_SYS_EXIT 90#endif 91 92/* 93 * Register usage in interrupt handlers: 94 * R9 - pointer to current task structure 95 * R13 - pointer to literal pool 96 * R14 - return register for function calls 97 * R15 - kernel stack pointer 98 */ 99 100 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 101 lm %r10,%r11,\lc_from 102 sl %r10,\lc_to 103 sl %r11,\lc_to+4 104 bc 3,BASED(0f) 105 sl %r10,BASED(.Lc_1) 1060: al %r10,\lc_sum 107 al %r11,\lc_sum+4 108 bc 12,BASED(1f) 109 al %r10,BASED(.Lc_1) 1101: stm %r10,%r11,\lc_sum 111 .endm 112 113 .macro SAVE_ALL_BASE savearea 114 stm %r12,%r15,\savearea 115 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 116 .endm 117 118 .macro SAVE_ALL_SVC psworg,savearea 119 la %r12,\psworg 120 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 121 .endm 122 123 .macro SAVE_ALL_SYNC psworg,savearea 124 la %r12,\psworg 125 tm \psworg+1,0x01 # test problem state bit 126 bz BASED(2f) # skip stack setup save 127 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 128#ifdef CONFIG_CHECK_STACK 129 b BASED(3f) 1302: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 131 bz BASED(stack_overflow) 1323: 133#endif 1342: 135 .endm 136 137 .macro SAVE_ALL_ASYNC psworg,savearea 138 la %r12,\psworg 139 tm \psworg+1,0x01 # test problem state bit 140 bnz BASED(1f) # from user -> load async stack 141 clc \psworg+4(4),BASED(.Lcritical_end) 142 bhe BASED(0f) 143 clc \psworg+4(4),BASED(.Lcritical_start) 144 bl BASED(0f) 145 l %r14,BASED(.Lcleanup_critical) 146 basr %r14,%r14 147 tm 1(%r12),0x01 # retest problem state after cleanup 148 bnz BASED(1f) 1490: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 150 slr %r14,%r15 151 sra %r14,STACK_SHIFT 152 be BASED(2f) 1531: l %r15,__LC_ASYNC_STACK 154#ifdef CONFIG_CHECK_STACK 155 b BASED(3f) 1562: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 157 bz BASED(stack_overflow) 1583: 159#endif 1602: 161 .endm 162 163 .macro CREATE_STACK_FRAME psworg,savearea 164 s %r15,BASED(.Lc_spsize) # make room for registers & psw 165 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 166 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 167 icm %r12,12,__LC_SVC_ILC 168 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 169 st %r12,SP_ILC(%r15) 170 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 171 la %r12,0 172 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 173 .endm 174 175 .macro RESTORE_ALL psworg,sync 176 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 177 .if !\sync 178 ni \psworg+1,0xfd # clear wait state bit 179 .endif 180 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 181 stpt __LC_EXIT_TIMER 182 lpsw \psworg # back to caller 183 .endm 184 185 .macro REENABLE_IRQS 186 mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) 187 ni __SF_EMPTY(%r15),0xbf 188 ssm __SF_EMPTY(%r15) 189 .endm 190 191/* 192 * Scheduler resume function, called by switch_to 193 * gpr2 = (task_struct *) prev 194 * gpr3 = (task_struct *) next 195 * Returns: 196 * gpr2 = prev 197 */ 198 .globl __switch_to 199__switch_to: 200 basr %r1,0 201__switch_to_base: 202 tm __THREAD_per(%r3),0xe8 # new process is using per ? 203 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 204 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 205 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 206 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 207 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 208__switch_to_noper: 209 l %r4,__THREAD_info(%r2) # get thread_info of prev 210 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 211 bz __switch_to_no_mcck-__switch_to_base(%r1) 212 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 213 l %r4,__THREAD_info(%r3) # get thread_info of next 214 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 215__switch_to_no_mcck: 216 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 217 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 218 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 219 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 220 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 221 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 222 l %r3,__THREAD_info(%r3) # load thread_info from task struct 223 st %r3,__LC_THREAD_INFO 224 ahi %r3,STACK_SIZE 225 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 226 br %r14 227 228__critical_start: 229/* 230 * SVC interrupt handler routine. System calls are synchronous events and 231 * are executed with interrupts enabled. 232 */ 233 234 .globl system_call 235system_call: 236 stpt __LC_SYNC_ENTER_TIMER 237sysc_saveall: 238 SAVE_ALL_BASE __LC_SAVE_AREA 239 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 240 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 241 lh %r7,0x8a # get svc number from lowcore 242sysc_vtime: 243 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 244sysc_stime: 245 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 246sysc_update: 247 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 248sysc_do_svc: 249 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 250 ltr %r7,%r7 # test for svc 0 251 bnz BASED(sysc_nr_ok) # svc number > 0 252 # svc 0: system call number in %r1 253 cl %r1,BASED(.Lnr_syscalls) 254 bnl BASED(sysc_nr_ok) 255 lr %r7,%r1 # copy svc number to %r7 256sysc_nr_ok: 257 sth %r7,SP_SVCNR(%r15) 258 sll %r7,2 # svc number *4 259 l %r8,BASED(.Lsysc_table) 260 tm __TI_flags+2(%r9),_TIF_SYSCALL 261 mvc SP_ARGS(4,%r15),SP_R7(%r15) 262 l %r8,0(%r7,%r8) # get system call addr. 263 bnz BASED(sysc_tracesys) 264 basr %r14,%r8 # call sys_xxxx 265 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 266 267sysc_return: 268 LOCKDEP_SYS_EXIT 269sysc_tif: 270 tm __TI_flags+3(%r9),_TIF_WORK_SVC 271 bnz BASED(sysc_work) # there is work to do (signals etc.) 272sysc_restore: 273 RESTORE_ALL __LC_RETURN_PSW,1 274sysc_done: 275 276# 277# There is work to do, but first we need to check if we return to userspace. 278# 279sysc_work: 280 tm SP_PSW+1(%r15),0x01 # returning to user ? 281 bno BASED(sysc_restore) 282 283# 284# One of the work bits is on. Find out which one. 285# 286sysc_work_tif: 287 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 288 bo BASED(sysc_mcck_pending) 289 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 290 bo BASED(sysc_reschedule) 291 tm __TI_flags+3(%r9),_TIF_SIGPENDING 292 bo BASED(sysc_sigpending) 293 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 294 bo BASED(sysc_notify_resume) 295 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 296 bo BASED(sysc_restart) 297 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 298 bo BASED(sysc_singlestep) 299 b BASED(sysc_return) # beware of critical section cleanup 300 301# 302# _TIF_NEED_RESCHED is set, call schedule 303# 304sysc_reschedule: 305 l %r1,BASED(.Lschedule) 306 la %r14,BASED(sysc_return) 307 br %r1 # call scheduler 308 309# 310# _TIF_MCCK_PENDING is set, call handler 311# 312sysc_mcck_pending: 313 l %r1,BASED(.Ls390_handle_mcck) 314 la %r14,BASED(sysc_return) 315 br %r1 # TIF bit will be cleared by handler 316 317# 318# _TIF_SIGPENDING is set, call do_signal 319# 320sysc_sigpending: 321 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 322 la %r2,SP_PTREGS(%r15) # load pt_regs 323 l %r1,BASED(.Ldo_signal) 324 basr %r14,%r1 # call do_signal 325 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 326 bo BASED(sysc_restart) 327 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 328 bo BASED(sysc_singlestep) 329 b BASED(sysc_return) 330 331# 332# _TIF_NOTIFY_RESUME is set, call do_notify_resume 333# 334sysc_notify_resume: 335 la %r2,SP_PTREGS(%r15) # load pt_regs 336 l %r1,BASED(.Ldo_notify_resume) 337 la %r14,BASED(sysc_return) 338 br %r1 # call do_notify_resume 339 340 341# 342# _TIF_RESTART_SVC is set, set up registers and restart svc 343# 344sysc_restart: 345 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 346 l %r7,SP_R2(%r15) # load new svc number 347 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 348 lm %r2,%r6,SP_R2(%r15) # load svc arguments 349 b BASED(sysc_nr_ok) # restart svc 350 351# 352# _TIF_SINGLE_STEP is set, call do_single_step 353# 354sysc_singlestep: 355 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 356 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 357 mvi SP_SVCNR+1(%r15),0xff 358 la %r2,SP_PTREGS(%r15) # address of register-save area 359 l %r1,BASED(.Lhandle_per) # load adr. of per handler 360 la %r14,BASED(sysc_return) # load adr. of system return 361 br %r1 # branch to do_single_step 362 363# 364# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 365# and after the system call 366# 367sysc_tracesys: 368 l %r1,BASED(.Ltrace_entry) 369 la %r2,SP_PTREGS(%r15) # load pt_regs 370 la %r3,0 371 srl %r7,2 372 st %r7,SP_R2(%r15) 373 basr %r14,%r1 374 cl %r2,BASED(.Lnr_syscalls) 375 bnl BASED(sysc_tracenogo) 376 l %r8,BASED(.Lsysc_table) 377 lr %r7,%r2 378 sll %r7,2 # svc number *4 379 l %r8,0(%r7,%r8) 380sysc_tracego: 381 lm %r3,%r6,SP_R3(%r15) 382 mvc SP_ARGS(4,%r15),SP_R7(%r15) 383 l %r2,SP_ORIG_R2(%r15) 384 basr %r14,%r8 # call sys_xxx 385 st %r2,SP_R2(%r15) # store return value 386sysc_tracenogo: 387 tm __TI_flags+2(%r9),_TIF_SYSCALL 388 bz BASED(sysc_return) 389 l %r1,BASED(.Ltrace_exit) 390 la %r2,SP_PTREGS(%r15) # load pt_regs 391 la %r14,BASED(sysc_return) 392 br %r1 393 394# 395# a new process exits the kernel with ret_from_fork 396# 397 .globl ret_from_fork 398ret_from_fork: 399 l %r13,__LC_SVC_NEW_PSW+4 400 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 401 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 402 bo BASED(0f) 403 st %r15,SP_R15(%r15) # store stack pointer for new kthread 4040: l %r1,BASED(.Lschedtail) 405 basr %r14,%r1 406 TRACE_IRQS_ON 407 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 408 b BASED(sysc_tracenogo) 409 410# 411# kernel_execve function needs to deal with pt_regs that is not 412# at the usual place 413# 414 .globl kernel_execve 415kernel_execve: 416 stm %r12,%r15,48(%r15) 417 lr %r14,%r15 418 l %r13,__LC_SVC_NEW_PSW+4 419 s %r15,BASED(.Lc_spsize) 420 st %r14,__SF_BACKCHAIN(%r15) 421 la %r12,SP_PTREGS(%r15) 422 xc 0(__PT_SIZE,%r12),0(%r12) 423 l %r1,BASED(.Ldo_execve) 424 lr %r5,%r12 425 basr %r14,%r1 426 ltr %r2,%r2 427 be BASED(0f) 428 a %r15,BASED(.Lc_spsize) 429 lm %r12,%r15,48(%r15) 430 br %r14 431 # execve succeeded. 4320: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 433 l %r15,__LC_KERNEL_STACK # load ksp 434 s %r15,BASED(.Lc_spsize) # make room for registers & psw 435 l %r9,__LC_THREAD_INFO 436 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 437 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 438 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 439 l %r1,BASED(.Lexecve_tail) 440 basr %r14,%r1 441 b BASED(sysc_return) 442 443/* 444 * Program check handler routine 445 */ 446 447 .globl pgm_check_handler 448pgm_check_handler: 449/* 450 * First we need to check for a special case: 451 * Single stepping an instruction that disables the PER event mask will 452 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 453 * For a single stepped SVC the program check handler gets control after 454 * the SVC new PSW has been loaded. But we want to execute the SVC first and 455 * then handle the PER event. Therefore we update the SVC old PSW to point 456 * to the pgm_check_handler and branch to the SVC handler after we checked 457 * if we have to load the kernel stack register. 458 * For every other possible cause for PER event without the PER mask set 459 * we just ignore the PER event (FIXME: is there anything we have to do 460 * for LPSW?). 461 */ 462 stpt __LC_SYNC_ENTER_TIMER 463 SAVE_ALL_BASE __LC_SAVE_AREA 464 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 465 bnz BASED(pgm_per) # got per exception -> special case 466 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 467 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 468 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 469 bz BASED(pgm_no_vtime) 470 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 471 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 472 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 473pgm_no_vtime: 474 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 475 l %r3,__LC_PGM_ILC # load program interruption code 476 l %r4,__LC_TRANS_EXC_CODE 477 REENABLE_IRQS 478 la %r8,0x7f 479 nr %r8,%r3 480pgm_do_call: 481 l %r7,BASED(.Ljump_table) 482 sll %r8,2 483 l %r7,0(%r8,%r7) # load address of handler routine 484 la %r2,SP_PTREGS(%r15) # address of register-save area 485 basr %r14,%r7 # branch to interrupt-handler 486pgm_exit: 487 b BASED(sysc_return) 488 489# 490# handle per exception 491# 492pgm_per: 493 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 494 bnz BASED(pgm_per_std) # ok, normal per event from user space 495# ok its one of the special cases, now we need to find out which one 496 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 497 be BASED(pgm_svcper) 498# no interesting special case, ignore PER event 499 lm %r12,%r15,__LC_SAVE_AREA 500 lpsw 0x28 501 502# 503# Normal per exception 504# 505pgm_per_std: 506 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 507 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 508 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 509 bz BASED(pgm_no_vtime2) 510 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 511 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 512 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 513pgm_no_vtime2: 514 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 515 l %r1,__TI_task(%r9) 516 tm SP_PSW+1(%r15),0x01 # kernel per event ? 517 bz BASED(kernel_per) 518 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 519 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 520 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 521 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 522 l %r3,__LC_PGM_ILC # load program interruption code 523 l %r4,__LC_TRANS_EXC_CODE 524 REENABLE_IRQS 525 la %r8,0x7f 526 nr %r8,%r3 # clear per-event-bit and ilc 527 be BASED(pgm_exit2) # only per or per+check ? 528 l %r7,BASED(.Ljump_table) 529 sll %r8,2 530 l %r7,0(%r8,%r7) # load address of handler routine 531 la %r2,SP_PTREGS(%r15) # address of register-save area 532 basr %r14,%r7 # branch to interrupt-handler 533pgm_exit2: 534 b BASED(sysc_return) 535 536# 537# it was a single stepped SVC that is causing all the trouble 538# 539pgm_svcper: 540 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 541 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 542 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 543 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 544 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 545 lh %r7,0x8a # get svc number from lowcore 546 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 547 l %r8,__TI_task(%r9) 548 mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID 549 mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS 550 mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID 551 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 552 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 553 lm %r2,%r6,SP_R2(%r15) # load svc arguments 554 b BASED(sysc_do_svc) 555 556# 557# per was called from kernel, must be kprobes 558# 559kernel_per: 560 REENABLE_IRQS 561 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 562 mvi SP_SVCNR+1(%r15),0xff 563 la %r2,SP_PTREGS(%r15) # address of register-save area 564 l %r1,BASED(.Lhandle_per) # load adr. of per handler 565 basr %r14,%r1 # branch to do_single_step 566 b BASED(pgm_exit) 567 568/* 569 * IO interrupt handler routine 570 */ 571 572 .globl io_int_handler 573io_int_handler: 574 stck __LC_INT_CLOCK 575 stpt __LC_ASYNC_ENTER_TIMER 576 SAVE_ALL_BASE __LC_SAVE_AREA+16 577 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 578 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 579 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 580 bz BASED(io_no_vtime) 581 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 582 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 583 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 584io_no_vtime: 585 TRACE_IRQS_OFF 586 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 587 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 588 la %r2,SP_PTREGS(%r15) # address of register-save area 589 basr %r14,%r1 # branch to standard irq handler 590io_return: 591 LOCKDEP_SYS_EXIT 592 TRACE_IRQS_ON 593io_tif: 594 tm __TI_flags+3(%r9),_TIF_WORK_INT 595 bnz BASED(io_work) # there is work to do (signals etc.) 596io_restore: 597 RESTORE_ALL __LC_RETURN_PSW,0 598io_done: 599 600# 601# There is work todo, find out in which context we have been interrupted: 602# 1) if we return to user space we can do all _TIF_WORK_INT work 603# 2) if we return to kernel code and preemptive scheduling is enabled check 604# the preemption counter and if it is zero call preempt_schedule_irq 605# Before any work can be done, a switch to the kernel stack is required. 606# 607io_work: 608 tm SP_PSW+1(%r15),0x01 # returning to user ? 609 bo BASED(io_work_user) # yes -> do resched & signal 610#ifdef CONFIG_PREEMPT 611 # check for preemptive scheduling 612 icm %r0,15,__TI_precount(%r9) 613 bnz BASED(io_restore) # preemption disabled 614 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 615 bno BASED(io_restore) 616 # switch to kernel stack 617 l %r1,SP_R15(%r15) 618 s %r1,BASED(.Lc_spsize) 619 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 620 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 621 lr %r15,%r1 622 # TRACE_IRQS_ON already done at io_return, call 623 # TRACE_IRQS_OFF to keep things symmetrical 624 TRACE_IRQS_OFF 625 l %r1,BASED(.Lpreempt_schedule_irq) 626 basr %r14,%r1 # call preempt_schedule_irq 627 b BASED(io_return) 628#else 629 b BASED(io_restore) 630#endif 631 632# 633# Need to do work before returning to userspace, switch to kernel stack 634# 635io_work_user: 636 l %r1,__LC_KERNEL_STACK 637 s %r1,BASED(.Lc_spsize) 638 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 639 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 640 lr %r15,%r1 641 642# 643# One of the work bits is on. Find out which one. 644# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED 645# and _TIF_MCCK_PENDING 646# 647io_work_tif: 648 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 649 bo BASED(io_mcck_pending) 650 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 651 bo BASED(io_reschedule) 652 tm __TI_flags+3(%r9),_TIF_SIGPENDING 653 bo BASED(io_sigpending) 654 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 655 bo BASED(io_notify_resume) 656 b BASED(io_return) # beware of critical section cleanup 657 658# 659# _TIF_MCCK_PENDING is set, call handler 660# 661io_mcck_pending: 662 # TRACE_IRQS_ON already done at io_return 663 l %r1,BASED(.Ls390_handle_mcck) 664 basr %r14,%r1 # TIF bit will be cleared by handler 665 TRACE_IRQS_OFF 666 b BASED(io_return) 667 668# 669# _TIF_NEED_RESCHED is set, call schedule 670# 671io_reschedule: 672 # TRACE_IRQS_ON already done at io_return 673 l %r1,BASED(.Lschedule) 674 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 675 basr %r14,%r1 # call scheduler 676 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 677 TRACE_IRQS_OFF 678 b BASED(io_return) 679 680# 681# _TIF_SIGPENDING is set, call do_signal 682# 683io_sigpending: 684 # TRACE_IRQS_ON already done at io_return 685 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 686 la %r2,SP_PTREGS(%r15) # load pt_regs 687 l %r1,BASED(.Ldo_signal) 688 basr %r14,%r1 # call do_signal 689 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 690 TRACE_IRQS_OFF 691 b BASED(io_return) 692 693# 694# _TIF_SIGPENDING is set, call do_signal 695# 696io_notify_resume: 697 # TRACE_IRQS_ON already done at io_return 698 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 699 la %r2,SP_PTREGS(%r15) # load pt_regs 700 l %r1,BASED(.Ldo_notify_resume) 701 basr %r14,%r1 # call do_signal 702 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 703 TRACE_IRQS_OFF 704 b BASED(io_return) 705 706/* 707 * External interrupt handler routine 708 */ 709 710 .globl ext_int_handler 711ext_int_handler: 712 stck __LC_INT_CLOCK 713 stpt __LC_ASYNC_ENTER_TIMER 714 SAVE_ALL_BASE __LC_SAVE_AREA+16 715 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 716 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 717 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 718 bz BASED(ext_no_vtime) 719 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 720 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 721 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 722ext_no_vtime: 723 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 724 TRACE_IRQS_OFF 725 la %r2,SP_PTREGS(%r15) # address of register-save area 726 l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code 727 l %r4,__LC_EXT_PARAMS # get external parameters 728 l %r1,BASED(.Ldo_extint) 729 basr %r14,%r1 730 b BASED(io_return) 731 732__critical_end: 733 734/* 735 * Machine check handler routines 736 */ 737 738 .globl mcck_int_handler 739mcck_int_handler: 740 stck __LC_MCCK_CLOCK 741 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 742 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 743 SAVE_ALL_BASE __LC_SAVE_AREA+32 744 la %r12,__LC_MCK_OLD_PSW 745 tm __LC_MCCK_CODE,0x80 # system damage? 746 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 747 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 748 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 749 bo BASED(1f) 750 la %r14,__LC_SYNC_ENTER_TIMER 751 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 752 bl BASED(0f) 753 la %r14,__LC_ASYNC_ENTER_TIMER 7540: clc 0(8,%r14),__LC_EXIT_TIMER 755 bl BASED(0f) 756 la %r14,__LC_EXIT_TIMER 7570: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 758 bl BASED(0f) 759 la %r14,__LC_LAST_UPDATE_TIMER 7600: spt 0(%r14) 761 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7621: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 763 bno BASED(mcck_int_main) # no -> skip cleanup critical 764 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 765 bnz BASED(mcck_int_main) # from user -> load async stack 766 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 767 bhe BASED(mcck_int_main) 768 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 769 bl BASED(mcck_int_main) 770 l %r14,BASED(.Lcleanup_critical) 771 basr %r14,%r14 772mcck_int_main: 773 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 774 slr %r14,%r15 775 sra %r14,PAGE_SHIFT 776 be BASED(0f) 777 l %r15,__LC_PANIC_STACK # load panic stack 7780: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 779 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 780 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 781 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 782 bz BASED(mcck_no_vtime) 783 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER 784 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 785 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER 786mcck_no_vtime: 787 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 788 la %r2,SP_PTREGS(%r15) # load pt_regs 789 l %r1,BASED(.Ls390_mcck) 790 basr %r14,%r1 # call machine check handler 791 tm SP_PSW+1(%r15),0x01 # returning to user ? 792 bno BASED(mcck_return) 793 l %r1,__LC_KERNEL_STACK # switch to kernel stack 794 s %r1,BASED(.Lc_spsize) 795 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 796 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 797 lr %r15,%r1 798 stosm __SF_EMPTY(%r15),0x04 # turn dat on 799 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 800 bno BASED(mcck_return) 801 TRACE_IRQS_OFF 802 l %r1,BASED(.Ls390_handle_mcck) 803 basr %r14,%r1 # call machine check handler 804 TRACE_IRQS_ON 805mcck_return: 806 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 807 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 808 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 809 bno BASED(0f) 810 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 811 stpt __LC_EXIT_TIMER 812 lpsw __LC_RETURN_MCCK_PSW # back to caller 8130: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 814 lpsw __LC_RETURN_MCCK_PSW # back to caller 815 816 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 817 818/* 819 * Restart interruption handler, kick starter for additional CPUs 820 */ 821#ifdef CONFIG_SMP 822 __CPUINIT 823 .globl restart_int_handler 824restart_int_handler: 825 basr %r1,0 826restart_base: 827 spt restart_vtime-restart_base(%r1) 828 stck __LC_LAST_UPDATE_CLOCK 829 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 830 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 831 l %r15,__LC_SAVE_AREA+60 # load ksp 832 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 833 lam %a0,%a15,__LC_AREGS_SAVE_AREA 834 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 835 l %r1,__LC_THREAD_INFO 836 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 837 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 838 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 839 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 840 basr %r14,0 841 l %r14,restart_addr-.(%r14) 842 br %r14 # branch to start_secondary 843restart_addr: 844 .long start_secondary 845 .align 8 846restart_vtime: 847 .long 0x7fffffff,0xffffffff 848 .previous 849#else 850/* 851 * If we do not run with SMP enabled, let the new CPU crash ... 852 */ 853 .globl restart_int_handler 854restart_int_handler: 855 basr %r1,0 856restart_base: 857 lpsw restart_crash-restart_base(%r1) 858 .align 8 859restart_crash: 860 .long 0x000a0000,0x00000000 861restart_go: 862#endif 863 864#ifdef CONFIG_CHECK_STACK 865/* 866 * The synchronous or the asynchronous stack overflowed. We are dead. 867 * No need to properly save the registers, we are going to panic anyway. 868 * Setup a pt_regs so that show_trace can provide a good call trace. 869 */ 870stack_overflow: 871 l %r15,__LC_PANIC_STACK # change to panic stack 872 sl %r15,BASED(.Lc_spsize) 873 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 874 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 875 la %r1,__LC_SAVE_AREA 876 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 877 be BASED(0f) 878 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 879 be BASED(0f) 880 la %r1,__LC_SAVE_AREA+16 8810: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 882 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 883 l %r1,BASED(1f) # branch to kernel_stack_overflow 884 la %r2,SP_PTREGS(%r15) # load pt_regs 885 br %r1 8861: .long kernel_stack_overflow 887#endif 888 889cleanup_table_system_call: 890 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 891cleanup_table_sysc_tif: 892 .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 893cleanup_table_sysc_restore: 894 .long sysc_restore + 0x80000000, sysc_done + 0x80000000 895cleanup_table_io_tif: 896 .long io_tif + 0x80000000, io_restore + 0x80000000 897cleanup_table_io_restore: 898 .long io_restore + 0x80000000, io_done + 0x80000000 899 900cleanup_critical: 901 clc 4(4,%r12),BASED(cleanup_table_system_call) 902 bl BASED(0f) 903 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 904 bl BASED(cleanup_system_call) 9050: 906 clc 4(4,%r12),BASED(cleanup_table_sysc_tif) 907 bl BASED(0f) 908 clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) 909 bl BASED(cleanup_sysc_tif) 9100: 911 clc 4(4,%r12),BASED(cleanup_table_sysc_restore) 912 bl BASED(0f) 913 clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) 914 bl BASED(cleanup_sysc_restore) 9150: 916 clc 4(4,%r12),BASED(cleanup_table_io_tif) 917 bl BASED(0f) 918 clc 4(4,%r12),BASED(cleanup_table_io_tif+4) 919 bl BASED(cleanup_io_tif) 9200: 921 clc 4(4,%r12),BASED(cleanup_table_io_restore) 922 bl BASED(0f) 923 clc 4(4,%r12),BASED(cleanup_table_io_restore+4) 924 bl BASED(cleanup_io_restore) 9250: 926 br %r14 927 928cleanup_system_call: 929 mvc __LC_RETURN_PSW(8),0(%r12) 930 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 931 bh BASED(0f) 932 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 933 c %r12,BASED(.Lmck_old_psw) 934 be BASED(0f) 935 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9360: c %r12,BASED(.Lmck_old_psw) 937 la %r12,__LC_SAVE_AREA+32 938 be BASED(0f) 939 la %r12,__LC_SAVE_AREA+16 9400: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 941 bhe BASED(cleanup_vtime) 942 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 943 bh BASED(0f) 944 mvc __LC_SAVE_AREA(16),0(%r12) 9450: st %r13,4(%r12) 946 st %r12,__LC_SAVE_AREA+48 # argh 947 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 948 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 949 l %r12,__LC_SAVE_AREA+48 # argh 950 st %r15,12(%r12) 951 lh %r7,0x8a 952cleanup_vtime: 953 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 954 bhe BASED(cleanup_stime) 955 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 956cleanup_stime: 957 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 958 bh BASED(cleanup_update) 959 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 960cleanup_update: 961 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 962 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 963 la %r12,__LC_RETURN_PSW 964 br %r14 965cleanup_system_call_insn: 966 .long sysc_saveall + 0x80000000 967 .long system_call + 0x80000000 968 .long sysc_vtime + 0x80000000 969 .long sysc_stime + 0x80000000 970 .long sysc_update + 0x80000000 971 972cleanup_sysc_tif: 973 mvc __LC_RETURN_PSW(4),0(%r12) 974 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) 975 la %r12,__LC_RETURN_PSW 976 br %r14 977 978cleanup_sysc_restore: 979 clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) 980 be BASED(2f) 981 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 982 c %r12,BASED(.Lmck_old_psw) 983 be BASED(0f) 984 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 9850: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) 986 be BASED(2f) 987 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 988 c %r12,BASED(.Lmck_old_psw) 989 la %r12,__LC_SAVE_AREA+32 990 be BASED(1f) 991 la %r12,__LC_SAVE_AREA+16 9921: mvc 0(16,%r12),SP_R12(%r15) 993 lm %r0,%r11,SP_R0(%r15) 994 l %r15,SP_R15(%r15) 9952: la %r12,__LC_RETURN_PSW 996 br %r14 997cleanup_sysc_restore_insn: 998 .long sysc_done - 4 + 0x80000000 999 .long sysc_done - 8 + 0x80000000 1000 1001cleanup_io_tif: 1002 mvc __LC_RETURN_PSW(4),0(%r12) 1003 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) 1004 la %r12,__LC_RETURN_PSW 1005 br %r14 1006 1007cleanup_io_restore: 1008 clc 4(4,%r12),BASED(cleanup_io_restore_insn) 1009 be BASED(1f) 1010 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 1011 clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) 1012 be BASED(1f) 1013 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1014 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1015 lm %r0,%r11,SP_R0(%r15) 1016 l %r15,SP_R15(%r15) 10171: la %r12,__LC_RETURN_PSW 1018 br %r14 1019cleanup_io_restore_insn: 1020 .long io_done - 4 + 0x80000000 1021 .long io_done - 8 + 0x80000000 1022 1023/* 1024 * Integer constants 1025 */ 1026 .align 4 1027.Lc_spsize: .long SP_SIZE 1028.Lc_overhead: .long STACK_FRAME_OVERHEAD 1029.Lnr_syscalls: .long NR_syscalls 1030.L0x018: .short 0x018 1031.L0x020: .short 0x020 1032.L0x028: .short 0x028 1033.L0x030: .short 0x030 1034.L0x038: .short 0x038 1035.Lc_1: .long 1 1036 1037/* 1038 * Symbol constants 1039 */ 1040.Ls390_mcck: .long s390_do_machine_check 1041.Ls390_handle_mcck: 1042 .long s390_handle_mcck 1043.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1044.Ldo_IRQ: .long do_IRQ 1045.Ldo_extint: .long do_extint 1046.Ldo_signal: .long do_signal 1047.Ldo_notify_resume: 1048 .long do_notify_resume 1049.Lhandle_per: .long do_single_step 1050.Ldo_execve: .long do_execve 1051.Lexecve_tail: .long execve_tail 1052.Ljump_table: .long pgm_check_table 1053.Lschedule: .long schedule 1054#ifdef CONFIG_PREEMPT 1055.Lpreempt_schedule_irq: 1056 .long preempt_schedule_irq 1057#endif 1058.Ltrace_entry: .long do_syscall_trace_enter 1059.Ltrace_exit: .long do_syscall_trace_exit 1060.Lschedtail: .long schedule_tail 1061.Lsysc_table: .long sys_call_table 1062#ifdef CONFIG_TRACE_IRQFLAGS 1063.Ltrace_irq_on_caller: 1064 .long trace_hardirqs_on_caller 1065.Ltrace_irq_off_caller: 1066 .long trace_hardirqs_off_caller 1067#endif 1068#ifdef CONFIG_LOCKDEP 1069.Llockdep_sys_exit: 1070 .long lockdep_sys_exit 1071#endif 1072.Lcritical_start: 1073 .long __critical_start + 0x80000000 1074.Lcritical_end: 1075 .long __critical_end + 0x80000000 1076.Lcleanup_critical: 1077 .long cleanup_critical 1078 1079 .section .rodata, "a" 1080#define SYSCALL(esa,esame,emu) .long esa 1081 .globl sys_call_table 1082sys_call_table: 1083#include "syscalls.S" 1084#undef SYSCALL 1085