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/linkage.h> 13#include <linux/init.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 22/* 23 * Stack layout for the system_call stack entry. 24 * The first few entries are identical to the user_regs_struct. 25 */ 26SP_PTREGS = STACK_FRAME_OVERHEAD 27SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 28SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 29SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 30SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 31SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 32SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 33SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 34SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 35SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 36SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 37SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 38SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 39SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 40SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 41SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 42SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 43SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 44SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 45SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 46SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC 47SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR 48SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 49 50_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 51 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP ) 52_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 53 _TIF_MCCK_PENDING) 54_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ 55 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) 56 57STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 58STACK_SIZE = 1 << STACK_SHIFT 59 60#define BASED(name) name-system_call(%r13) 61 62#ifdef CONFIG_TRACE_IRQFLAGS 63 .macro TRACE_IRQS_ON 64 basr %r2,%r0 65 l %r1,BASED(.Ltrace_irq_on_caller) 66 basr %r14,%r1 67 .endm 68 69 .macro TRACE_IRQS_OFF 70 basr %r2,%r0 71 l %r1,BASED(.Ltrace_irq_off_caller) 72 basr %r14,%r1 73 .endm 74#else 75#define TRACE_IRQS_ON 76#define TRACE_IRQS_OFF 77#endif 78 79#ifdef CONFIG_LOCKDEP 80 .macro LOCKDEP_SYS_EXIT 81 tm SP_PSW+1(%r15),0x01 # returning to user ? 82 jz 0f 83 l %r1,BASED(.Llockdep_sys_exit) 84 basr %r14,%r1 850: 86 .endm 87#else 88#define LOCKDEP_SYS_EXIT 89#endif 90 91/* 92 * Register usage in interrupt handlers: 93 * R9 - pointer to current task structure 94 * R13 - pointer to literal pool 95 * R14 - return register for function calls 96 * R15 - kernel stack pointer 97 */ 98 99 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 100 lm %r10,%r11,\lc_from 101 sl %r10,\lc_to 102 sl %r11,\lc_to+4 103 bc 3,BASED(0f) 104 sl %r10,BASED(.Lc_1) 1050: al %r10,\lc_sum 106 al %r11,\lc_sum+4 107 bc 12,BASED(1f) 108 al %r10,BASED(.Lc_1) 1091: stm %r10,%r11,\lc_sum 110 .endm 111 112 .macro SAVE_ALL_SVC psworg,savearea 113 stm %r12,%r15,\savearea 114 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 115 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 116 s %r15,BASED(.Lc_spsize) # make room for registers & psw 117 .endm 118 119 .macro SAVE_ALL_BASE savearea 120 stm %r12,%r15,\savearea 121 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 122 .endm 123 124 .macro SAVE_ALL_PGM psworg,savearea 125 tm \psworg+1,0x01 # test problem state bit 126#ifdef CONFIG_CHECK_STACK 127 bnz BASED(1f) 128 tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 129 bnz BASED(2f) 130 la %r12,\psworg 131 b BASED(stack_overflow) 132#else 133 bz BASED(2f) 134#endif 1351: l %r15,__LC_KERNEL_STACK # problem state -> load ksp 1362: s %r15,BASED(.Lc_spsize) # make room for registers & psw 137 .endm 138 139 .macro SAVE_ALL_ASYNC psworg,savearea 140 stm %r12,%r15,\savearea 141 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 142 la %r12,\psworg 143 tm \psworg+1,0x01 # test problem state bit 144 bnz BASED(1f) # from user -> load async stack 145 clc \psworg+4(4),BASED(.Lcritical_end) 146 bhe BASED(0f) 147 clc \psworg+4(4),BASED(.Lcritical_start) 148 bl BASED(0f) 149 l %r14,BASED(.Lcleanup_critical) 150 basr %r14,%r14 151 tm 1(%r12),0x01 # retest problem state after cleanup 152 bnz BASED(1f) 1530: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 154 slr %r14,%r15 155 sra %r14,STACK_SHIFT 156#ifdef CONFIG_CHECK_STACK 157 bnz BASED(1f) 158 tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 159 bnz BASED(2f) 160 b BASED(stack_overflow) 161#else 162 bz BASED(2f) 163#endif 1641: l %r15,__LC_ASYNC_STACK 1652: s %r15,BASED(.Lc_spsize) # make room for registers & psw 166 .endm 167 168 .macro CREATE_STACK_FRAME savearea 169 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 170 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 171 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 172 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 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 .section .kprobes.text, "ax" 192 193/* 194 * Scheduler resume function, called by switch_to 195 * gpr2 = (task_struct *) prev 196 * gpr3 = (task_struct *) next 197 * Returns: 198 * gpr2 = prev 199 */ 200 .globl __switch_to 201__switch_to: 202 basr %r1,0 2030: l %r4,__THREAD_info(%r2) # get thread_info of prev 204 l %r5,__THREAD_info(%r3) # get thread_info of next 205 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 206 bz 1f-0b(%r1) 207 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 208 oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next 2091: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 210 st %r15,__THREAD_ksp(%r2) # store kernel stack of prev 211 l %r15,__THREAD_ksp(%r3) # load kernel stack of next 212 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 213 lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 214 st %r3,__LC_CURRENT # store task struct of next 215 mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next 216 st %r5,__LC_THREAD_INFO # store thread info of next 217 ahi %r5,STACK_SIZE # end of kernel stack of next 218 st %r5,__LC_KERNEL_STACK # store end of kernel stack 219 br %r14 220 221__critical_start: 222/* 223 * SVC interrupt handler routine. System calls are synchronous events and 224 * are executed with interrupts enabled. 225 */ 226 227 .globl system_call 228system_call: 229 stpt __LC_SYNC_ENTER_TIMER 230sysc_saveall: 231 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 232 CREATE_STACK_FRAME __LC_SAVE_AREA 233 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 234 mvc SP_ILC(4,%r15),__LC_SVC_ILC 235 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 236sysc_vtime: 237 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 238sysc_stime: 239 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 240sysc_update: 241 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 242sysc_do_svc: 243 xr %r7,%r7 244 icm %r7,3,SP_SVCNR(%r15) # load svc number and test for svc 0 245 bnz BASED(sysc_nr_ok) # svc number > 0 246 # svc 0: system call number in %r1 247 cl %r1,BASED(.Lnr_syscalls) 248 bnl BASED(sysc_nr_ok) 249 sth %r1,SP_SVCNR(%r15) 250 lr %r7,%r1 # copy svc number to %r7 251sysc_nr_ok: 252 sll %r7,2 # svc number *4 253 l %r10,BASED(.Lsysc_table) 254 tm __TI_flags+2(%r12),_TIF_SYSCALL 255 mvc SP_ARGS(4,%r15),SP_R7(%r15) 256 l %r8,0(%r7,%r10) # get system call addr. 257 bnz BASED(sysc_tracesys) 258 basr %r14,%r8 # call sys_xxxx 259 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 260 261sysc_return: 262 LOCKDEP_SYS_EXIT 263sysc_tif: 264 tm __TI_flags+3(%r12),_TIF_WORK_SVC 265 bnz BASED(sysc_work) # there is work to do (signals etc.) 266sysc_restore: 267 RESTORE_ALL __LC_RETURN_PSW,1 268sysc_done: 269 270# 271# There is work to do, but first we need to check if we return to userspace. 272# 273sysc_work: 274 tm SP_PSW+1(%r15),0x01 # returning to user ? 275 bno BASED(sysc_restore) 276 277# 278# One of the work bits is on. Find out which one. 279# 280sysc_work_tif: 281 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 282 bo BASED(sysc_mcck_pending) 283 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 284 bo BASED(sysc_reschedule) 285 tm __TI_flags+3(%r12),_TIF_SIGPENDING 286 bo BASED(sysc_sigpending) 287 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 288 bo BASED(sysc_notify_resume) 289 tm __TI_flags+3(%r12),_TIF_RESTART_SVC 290 bo BASED(sysc_restart) 291 tm __TI_flags+3(%r12),_TIF_PER_TRAP 292 bo BASED(sysc_singlestep) 293 b BASED(sysc_return) # beware of critical section cleanup 294 295# 296# _TIF_NEED_RESCHED is set, call schedule 297# 298sysc_reschedule: 299 l %r1,BASED(.Lschedule) 300 la %r14,BASED(sysc_return) 301 br %r1 # call scheduler 302 303# 304# _TIF_MCCK_PENDING is set, call handler 305# 306sysc_mcck_pending: 307 l %r1,BASED(.Ls390_handle_mcck) 308 la %r14,BASED(sysc_return) 309 br %r1 # TIF bit will be cleared by handler 310 311# 312# _TIF_SIGPENDING is set, call do_signal 313# 314sysc_sigpending: 315 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP 316 la %r2,SP_PTREGS(%r15) # load pt_regs 317 l %r1,BASED(.Ldo_signal) 318 basr %r14,%r1 # call do_signal 319 tm __TI_flags+3(%r12),_TIF_RESTART_SVC 320 bo BASED(sysc_restart) 321 tm __TI_flags+3(%r12),_TIF_PER_TRAP 322 bo BASED(sysc_singlestep) 323 b BASED(sysc_return) 324 325# 326# _TIF_NOTIFY_RESUME is set, call do_notify_resume 327# 328sysc_notify_resume: 329 la %r2,SP_PTREGS(%r15) # load pt_regs 330 l %r1,BASED(.Ldo_notify_resume) 331 la %r14,BASED(sysc_return) 332 br %r1 # call do_notify_resume 333 334 335# 336# _TIF_RESTART_SVC is set, set up registers and restart svc 337# 338sysc_restart: 339 ni __TI_flags+3(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 340 l %r7,SP_R2(%r15) # load new svc number 341 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 342 lm %r2,%r6,SP_R2(%r15) # load svc arguments 343 sth %r7,SP_SVCNR(%r15) 344 b BASED(sysc_nr_ok) # restart svc 345 346# 347# _TIF_PER_TRAP is set, call do_per_trap 348# 349sysc_singlestep: 350 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP 351 xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number 352 la %r2,SP_PTREGS(%r15) # address of register-save area 353 l %r1,BASED(.Lhandle_per) # load adr. of per handler 354 la %r14,BASED(sysc_return) # load adr. of system return 355 br %r1 # branch to do_per_trap 356 357# 358# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 359# and after the system call 360# 361sysc_tracesys: 362 l %r1,BASED(.Ltrace_entry) 363 la %r2,SP_PTREGS(%r15) # load pt_regs 364 la %r3,0 365 xr %r0,%r0 366 icm %r0,3,SP_SVCNR(%r15) 367 st %r0,SP_R2(%r15) 368 basr %r14,%r1 369 cl %r2,BASED(.Lnr_syscalls) 370 bnl BASED(sysc_tracenogo) 371 lr %r7,%r2 372 sll %r7,2 # svc number *4 373 l %r8,0(%r7,%r10) 374sysc_tracego: 375 lm %r3,%r6,SP_R3(%r15) 376 mvc SP_ARGS(4,%r15),SP_R7(%r15) 377 l %r2,SP_ORIG_R2(%r15) 378 basr %r14,%r8 # call sys_xxx 379 st %r2,SP_R2(%r15) # store return value 380sysc_tracenogo: 381 tm __TI_flags+2(%r12),_TIF_SYSCALL 382 bz BASED(sysc_return) 383 l %r1,BASED(.Ltrace_exit) 384 la %r2,SP_PTREGS(%r15) # load pt_regs 385 la %r14,BASED(sysc_return) 386 br %r1 387 388# 389# a new process exits the kernel with ret_from_fork 390# 391 .globl ret_from_fork 392ret_from_fork: 393 l %r13,__LC_SVC_NEW_PSW+4 394 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 395 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 396 bo BASED(0f) 397 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3980: l %r1,BASED(.Lschedtail) 399 basr %r14,%r1 400 TRACE_IRQS_ON 401 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 402 b BASED(sysc_tracenogo) 403 404# 405# kernel_execve function needs to deal with pt_regs that is not 406# at the usual place 407# 408 .globl kernel_execve 409kernel_execve: 410 stm %r12,%r15,48(%r15) 411 lr %r14,%r15 412 l %r13,__LC_SVC_NEW_PSW+4 413 s %r15,BASED(.Lc_spsize) 414 st %r14,__SF_BACKCHAIN(%r15) 415 la %r12,SP_PTREGS(%r15) 416 xc 0(__PT_SIZE,%r12),0(%r12) 417 l %r1,BASED(.Ldo_execve) 418 lr %r5,%r12 419 basr %r14,%r1 420 ltr %r2,%r2 421 be BASED(0f) 422 a %r15,BASED(.Lc_spsize) 423 lm %r12,%r15,48(%r15) 424 br %r14 425 # execve succeeded. 4260: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 427 l %r15,__LC_KERNEL_STACK # load ksp 428 s %r15,BASED(.Lc_spsize) # make room for registers & psw 429 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 430 l %r12,__LC_THREAD_INFO 431 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 432 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 433 l %r1,BASED(.Lexecve_tail) 434 basr %r14,%r1 435 b BASED(sysc_return) 436 437/* 438 * Program check handler routine 439 */ 440 441 .globl pgm_check_handler 442pgm_check_handler: 443/* 444 * First we need to check for a special case: 445 * Single stepping an instruction that disables the PER event mask will 446 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 447 * For a single stepped SVC the program check handler gets control after 448 * the SVC new PSW has been loaded. But we want to execute the SVC first and 449 * then handle the PER event. Therefore we update the SVC old PSW to point 450 * to the pgm_check_handler and branch to the SVC handler after we checked 451 * if we have to load the kernel stack register. 452 * For every other possible cause for PER event without the PER mask set 453 * we just ignore the PER event (FIXME: is there anything we have to do 454 * for LPSW?). 455 */ 456 stpt __LC_SYNC_ENTER_TIMER 457 SAVE_ALL_BASE __LC_SAVE_AREA 458 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 459 bnz BASED(pgm_per) # got per exception -> special case 460 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 461 CREATE_STACK_FRAME __LC_SAVE_AREA 462 xc SP_ILC(4,%r15),SP_ILC(%r15) 463 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 464 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 465 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 466 bz BASED(pgm_no_vtime) 467 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 468 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 469 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 470pgm_no_vtime: 471 l %r3,__LC_PGM_ILC # load program interruption code 472 l %r4,__LC_TRANS_EXC_CODE 473 REENABLE_IRQS 474 la %r8,0x7f 475 nr %r8,%r3 476 sll %r8,2 477 l %r1,BASED(.Ljump_table) 478 l %r1,0(%r8,%r1) # load address of handler routine 479 la %r2,SP_PTREGS(%r15) # address of register-save area 480 basr %r14,%r1 # branch to interrupt-handler 481pgm_exit: 482 b BASED(sysc_return) 483 484# 485# handle per exception 486# 487pgm_per: 488 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 489 bnz BASED(pgm_per_std) # ok, normal per event from user space 490# ok its one of the special cases, now we need to find out which one 491 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 492 be BASED(pgm_svcper) 493# no interesting special case, ignore PER event 494 lm %r12,%r15,__LC_SAVE_AREA 495 lpsw 0x28 496 497# 498# Normal per exception 499# 500pgm_per_std: 501 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 502 CREATE_STACK_FRAME __LC_SAVE_AREA 503 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 504 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 505 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 506 bz BASED(pgm_no_vtime2) 507 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 508 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 509 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 510pgm_no_vtime2: 511 l %r1,__TI_task(%r12) 512 tm SP_PSW+1(%r15),0x01 # kernel per event ? 513 bz BASED(kernel_per) 514 mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE 515 mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS 516 mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID 517 oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP 518 l %r3,__LC_PGM_ILC # load program interruption code 519 l %r4,__LC_TRANS_EXC_CODE 520 REENABLE_IRQS 521 la %r8,0x7f 522 nr %r8,%r3 # clear per-event-bit and ilc 523 be BASED(pgm_exit2) # only per or per+check ? 524 sll %r8,2 525 l %r1,BASED(.Ljump_table) 526 l %r1,0(%r8,%r1) # load address of handler routine 527 la %r2,SP_PTREGS(%r15) # address of register-save area 528 basr %r14,%r1 # branch to interrupt-handler 529pgm_exit2: 530 b BASED(sysc_return) 531 532# 533# it was a single stepped SVC that is causing all the trouble 534# 535pgm_svcper: 536 SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA 537 CREATE_STACK_FRAME __LC_SAVE_AREA 538 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 539 mvc SP_ILC(4,%r15),__LC_SVC_ILC 540 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 541 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 542 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 543 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 544 l %r8,__TI_task(%r12) 545 mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE 546 mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS 547 mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID 548 oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP 549 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 550 lm %r2,%r6,SP_R2(%r15) # load svc arguments 551 b BASED(sysc_do_svc) 552 553# 554# per was called from kernel, must be kprobes 555# 556kernel_per: 557 REENABLE_IRQS 558 xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) 559 la %r2,SP_PTREGS(%r15) # address of register-save area 560 l %r1,BASED(.Lhandle_per) # load adr. of per handler 561 basr %r14,%r1 # branch to do_single_step 562 b BASED(pgm_exit) 563 564/* 565 * IO interrupt handler routine 566 */ 567 568 .globl io_int_handler 569io_int_handler: 570 stck __LC_INT_CLOCK 571 stpt __LC_ASYNC_ENTER_TIMER 572 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 573 CREATE_STACK_FRAME __LC_SAVE_AREA+16 574 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 575 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 576 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 577 bz BASED(io_no_vtime) 578 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 579 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 580 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 581io_no_vtime: 582 TRACE_IRQS_OFF 583 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 584 la %r2,SP_PTREGS(%r15) # address of register-save area 585 basr %r14,%r1 # branch to standard irq handler 586io_return: 587 LOCKDEP_SYS_EXIT 588 TRACE_IRQS_ON 589io_tif: 590 tm __TI_flags+3(%r12),_TIF_WORK_INT 591 bnz BASED(io_work) # there is work to do (signals etc.) 592io_restore: 593 RESTORE_ALL __LC_RETURN_PSW,0 594io_done: 595 596# 597# There is work todo, find out in which context we have been interrupted: 598# 1) if we return to user space we can do all _TIF_WORK_INT work 599# 2) if we return to kernel code and preemptive scheduling is enabled check 600# the preemption counter and if it is zero call preempt_schedule_irq 601# Before any work can be done, a switch to the kernel stack is required. 602# 603io_work: 604 tm SP_PSW+1(%r15),0x01 # returning to user ? 605 bo BASED(io_work_user) # yes -> do resched & signal 606#ifdef CONFIG_PREEMPT 607 # check for preemptive scheduling 608 icm %r0,15,__TI_precount(%r12) 609 bnz BASED(io_restore) # preemption disabled 610 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 611 bno BASED(io_restore) 612 # switch to kernel stack 613 l %r1,SP_R15(%r15) 614 s %r1,BASED(.Lc_spsize) 615 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 616 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 617 lr %r15,%r1 618 # TRACE_IRQS_ON already done at io_return, call 619 # TRACE_IRQS_OFF to keep things symmetrical 620 TRACE_IRQS_OFF 621 l %r1,BASED(.Lpreempt_schedule_irq) 622 basr %r14,%r1 # call preempt_schedule_irq 623 b BASED(io_return) 624#else 625 b BASED(io_restore) 626#endif 627 628# 629# Need to do work before returning to userspace, switch to kernel stack 630# 631io_work_user: 632 l %r1,__LC_KERNEL_STACK 633 s %r1,BASED(.Lc_spsize) 634 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 635 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 636 lr %r15,%r1 637 638# 639# One of the work bits is on. Find out which one. 640# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED 641# and _TIF_MCCK_PENDING 642# 643io_work_tif: 644 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 645 bo BASED(io_mcck_pending) 646 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 647 bo BASED(io_reschedule) 648 tm __TI_flags+3(%r12),_TIF_SIGPENDING 649 bo BASED(io_sigpending) 650 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 651 bo BASED(io_notify_resume) 652 b BASED(io_return) # beware of critical section cleanup 653 654# 655# _TIF_MCCK_PENDING is set, call handler 656# 657io_mcck_pending: 658 # TRACE_IRQS_ON already done at io_return 659 l %r1,BASED(.Ls390_handle_mcck) 660 basr %r14,%r1 # TIF bit will be cleared by handler 661 TRACE_IRQS_OFF 662 b BASED(io_return) 663 664# 665# _TIF_NEED_RESCHED is set, call schedule 666# 667io_reschedule: 668 # TRACE_IRQS_ON already done at io_return 669 l %r1,BASED(.Lschedule) 670 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 671 basr %r14,%r1 # call scheduler 672 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 673 TRACE_IRQS_OFF 674 b BASED(io_return) 675 676# 677# _TIF_SIGPENDING is set, call do_signal 678# 679io_sigpending: 680 # TRACE_IRQS_ON already done at io_return 681 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 682 la %r2,SP_PTREGS(%r15) # load pt_regs 683 l %r1,BASED(.Ldo_signal) 684 basr %r14,%r1 # call do_signal 685 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 686 TRACE_IRQS_OFF 687 b BASED(io_return) 688 689# 690# _TIF_SIGPENDING is set, call do_signal 691# 692io_notify_resume: 693 # TRACE_IRQS_ON already done at io_return 694 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 695 la %r2,SP_PTREGS(%r15) # load pt_regs 696 l %r1,BASED(.Ldo_notify_resume) 697 basr %r14,%r1 # call do_signal 698 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 699 TRACE_IRQS_OFF 700 b BASED(io_return) 701 702/* 703 * External interrupt handler routine 704 */ 705 706 .globl ext_int_handler 707ext_int_handler: 708 stck __LC_INT_CLOCK 709 stpt __LC_ASYNC_ENTER_TIMER 710 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 711 CREATE_STACK_FRAME __LC_SAVE_AREA+16 712 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 713 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 714 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 715 bz BASED(ext_no_vtime) 716 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 717 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 718 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 719ext_no_vtime: 720 TRACE_IRQS_OFF 721 la %r2,SP_PTREGS(%r15) # address of register-save area 722 l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code 723 l %r4,__LC_EXT_PARAMS # get external parameters 724 l %r1,BASED(.Ldo_extint) 725 basr %r14,%r1 726 b BASED(io_return) 727 728__critical_end: 729 730/* 731 * Machine check handler routines 732 */ 733 734 .globl mcck_int_handler 735mcck_int_handler: 736 stck __LC_MCCK_CLOCK 737 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 738 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 739 SAVE_ALL_BASE __LC_SAVE_AREA+32 740 la %r12,__LC_MCK_OLD_PSW 741 tm __LC_MCCK_CODE,0x80 # system damage? 742 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 743 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 744 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 745 bo BASED(1f) 746 la %r14,__LC_SYNC_ENTER_TIMER 747 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 748 bl BASED(0f) 749 la %r14,__LC_ASYNC_ENTER_TIMER 7500: clc 0(8,%r14),__LC_EXIT_TIMER 751 bl BASED(0f) 752 la %r14,__LC_EXIT_TIMER 7530: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 754 bl BASED(0f) 755 la %r14,__LC_LAST_UPDATE_TIMER 7560: spt 0(%r14) 757 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7581: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 759 bno BASED(mcck_int_main) # no -> skip cleanup critical 760 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 761 bnz BASED(mcck_int_main) # from user -> load async stack 762 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 763 bhe BASED(mcck_int_main) 764 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 765 bl BASED(mcck_int_main) 766 l %r14,BASED(.Lcleanup_critical) 767 basr %r14,%r14 768mcck_int_main: 769 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 770 slr %r14,%r15 771 sra %r14,PAGE_SHIFT 772 be BASED(0f) 773 l %r15,__LC_PANIC_STACK # load panic stack 7740: s %r15,BASED(.Lc_spsize) # make room for registers & psw 775 CREATE_STACK_FRAME __LC_SAVE_AREA+32 776 mvc SP_PSW(8,%r15),0(%r12) 777 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 778 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 779 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 780 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 781 bz BASED(mcck_no_vtime) 782 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER 783 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 784 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER 785mcck_no_vtime: 786 la %r2,SP_PTREGS(%r15) # load pt_regs 787 l %r1,BASED(.Ls390_mcck) 788 basr %r14,%r1 # call machine check handler 789 tm SP_PSW+1(%r15),0x01 # returning to user ? 790 bno BASED(mcck_return) 791 l %r1,__LC_KERNEL_STACK # switch to kernel stack 792 s %r1,BASED(.Lc_spsize) 793 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 794 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 795 lr %r15,%r1 796 stosm __SF_EMPTY(%r15),0x04 # turn dat on 797 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 798 bno BASED(mcck_return) 799 TRACE_IRQS_OFF 800 l %r1,BASED(.Ls390_handle_mcck) 801 basr %r14,%r1 # call machine check handler 802 TRACE_IRQS_ON 803mcck_return: 804 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 805 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 806 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 807 bno BASED(0f) 808 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 809 stpt __LC_EXIT_TIMER 810 lpsw __LC_RETURN_MCCK_PSW # back to caller 8110: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 812 lpsw __LC_RETURN_MCCK_PSW # back to caller 813 814 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 815 816/* 817 * Restart interruption handler, kick starter for additional CPUs 818 */ 819#ifdef CONFIG_SMP 820 __CPUINIT 821 .globl restart_int_handler 822restart_int_handler: 823 basr %r1,0 824restart_base: 825 spt restart_vtime-restart_base(%r1) 826 stck __LC_LAST_UPDATE_CLOCK 827 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 828 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 829 l %r15,__LC_SAVE_AREA+60 # load ksp 830 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 831 lam %a0,%a15,__LC_AREGS_SAVE_AREA 832 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 833 l %r1,__LC_THREAD_INFO 834 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 835 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 836 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 837 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 838 basr %r14,0 839 l %r14,restart_addr-.(%r14) 840 basr %r14,%r14 # branch to start_secondary 841restart_addr: 842 .long start_secondary 843 .align 8 844restart_vtime: 845 .long 0x7fffffff,0xffffffff 846 .previous 847#else 848/* 849 * If we do not run with SMP enabled, let the new CPU crash ... 850 */ 851 .globl restart_int_handler 852restart_int_handler: 853 basr %r1,0 854restart_base: 855 lpsw restart_crash-restart_base(%r1) 856 .align 8 857restart_crash: 858 .long 0x000a0000,0x00000000 859restart_go: 860#endif 861 862 .section .kprobes.text, "ax" 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 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 947 s %r15,BASED(.Lc_spsize) # make room for registers & psw 948 st %r15,12(%r12) 949 CREATE_STACK_FRAME __LC_SAVE_AREA 950 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 951 mvc SP_ILC(4,%r15),__LC_SVC_ILC 952 mvc 0(4,%r12),__LC_THREAD_INFO 953cleanup_vtime: 954 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 955 bhe BASED(cleanup_stime) 956 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 957cleanup_stime: 958 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 959 bh BASED(cleanup_update) 960 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 961cleanup_update: 962 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 963 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 964 la %r12,__LC_RETURN_PSW 965 br %r14 966cleanup_system_call_insn: 967 .long sysc_saveall + 0x80000000 968 .long system_call + 0x80000000 969 .long sysc_vtime + 0x80000000 970 .long sysc_stime + 0x80000000 971 .long sysc_update + 0x80000000 972 973cleanup_sysc_tif: 974 mvc __LC_RETURN_PSW(4),0(%r12) 975 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) 976 la %r12,__LC_RETURN_PSW 977 br %r14 978 979cleanup_sysc_restore: 980 clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) 981 be BASED(2f) 982 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 983 c %r12,BASED(.Lmck_old_psw) 984 be BASED(0f) 985 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 9860: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) 987 be BASED(2f) 988 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 989 c %r12,BASED(.Lmck_old_psw) 990 la %r12,__LC_SAVE_AREA+32 991 be BASED(1f) 992 la %r12,__LC_SAVE_AREA+16 9931: mvc 0(16,%r12),SP_R12(%r15) 994 lm %r0,%r11,SP_R0(%r15) 995 l %r15,SP_R15(%r15) 9962: la %r12,__LC_RETURN_PSW 997 br %r14 998cleanup_sysc_restore_insn: 999 .long sysc_done - 4 + 0x80000000 1000 .long sysc_done - 8 + 0x80000000 1001 1002cleanup_io_tif: 1003 mvc __LC_RETURN_PSW(4),0(%r12) 1004 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) 1005 la %r12,__LC_RETURN_PSW 1006 br %r14 1007 1008cleanup_io_restore: 1009 clc 4(4,%r12),BASED(cleanup_io_restore_insn) 1010 be BASED(1f) 1011 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 1012 clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) 1013 be BASED(1f) 1014 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1015 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1016 lm %r0,%r11,SP_R0(%r15) 1017 l %r15,SP_R15(%r15) 10181: la %r12,__LC_RETURN_PSW 1019 br %r14 1020cleanup_io_restore_insn: 1021 .long io_done - 4 + 0x80000000 1022 .long io_done - 8 + 0x80000000 1023 1024/* 1025 * Integer constants 1026 */ 1027 .align 4 1028.Lc_spsize: .long SP_SIZE 1029.Lc_overhead: .long STACK_FRAME_OVERHEAD 1030.Lnr_syscalls: .long NR_syscalls 1031.L0x018: .short 0x018 1032.L0x020: .short 0x020 1033.L0x028: .short 0x028 1034.L0x030: .short 0x030 1035.L0x038: .short 0x038 1036.Lc_1: .long 1 1037 1038/* 1039 * Symbol constants 1040 */ 1041.Ls390_mcck: .long s390_do_machine_check 1042.Ls390_handle_mcck: 1043 .long s390_handle_mcck 1044.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1045.Ldo_IRQ: .long do_IRQ 1046.Ldo_extint: .long do_extint 1047.Ldo_signal: .long do_signal 1048.Ldo_notify_resume: 1049 .long do_notify_resume 1050.Lhandle_per: .long do_per_trap 1051.Ldo_execve: .long do_execve 1052.Lexecve_tail: .long execve_tail 1053.Ljump_table: .long pgm_check_table 1054.Lschedule: .long schedule 1055#ifdef CONFIG_PREEMPT 1056.Lpreempt_schedule_irq: 1057 .long preempt_schedule_irq 1058#endif 1059.Ltrace_entry: .long do_syscall_trace_enter 1060.Ltrace_exit: .long do_syscall_trace_exit 1061.Lschedtail: .long schedule_tail 1062.Lsysc_table: .long sys_call_table 1063#ifdef CONFIG_TRACE_IRQFLAGS 1064.Ltrace_irq_on_caller: 1065 .long trace_hardirqs_on_caller 1066.Ltrace_irq_off_caller: 1067 .long trace_hardirqs_off_caller 1068#endif 1069#ifdef CONFIG_LOCKDEP 1070.Llockdep_sys_exit: 1071 .long lockdep_sys_exit 1072#endif 1073.Lcritical_start: 1074 .long __critical_start + 0x80000000 1075.Lcritical_end: 1076 .long __critical_end + 0x80000000 1077.Lcleanup_critical: 1078 .long cleanup_critical 1079 1080 .section .rodata, "a" 1081#define SYSCALL(esa,esame,emu) .long esa 1082 .globl sys_call_table 1083sys_call_table: 1084#include "syscalls.S" 1085#undef SYSCALL 1086