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 st %r5,__LC_THREAD_INFO # store thread info of next 216 ahi %r5,STACK_SIZE # end of kernel stack of next 217 st %r5,__LC_KERNEL_STACK # store end of kernel stack 218 br %r14 219 220__critical_start: 221/* 222 * SVC interrupt handler routine. System calls are synchronous events and 223 * are executed with interrupts enabled. 224 */ 225 226 .globl system_call 227system_call: 228 stpt __LC_SYNC_ENTER_TIMER 229sysc_saveall: 230 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 231 CREATE_STACK_FRAME __LC_SAVE_AREA 232 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 233 mvc SP_ILC(4,%r15),__LC_SVC_ILC 234 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 235sysc_vtime: 236 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 237sysc_stime: 238 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 239sysc_update: 240 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 241sysc_do_svc: 242 xr %r7,%r7 243 icm %r7,3,SP_SVCNR(%r15) # load svc number and test for svc 0 244 bnz BASED(sysc_nr_ok) # svc number > 0 245 # svc 0: system call number in %r1 246 cl %r1,BASED(.Lnr_syscalls) 247 bnl BASED(sysc_nr_ok) 248 sth %r1,SP_SVCNR(%r15) 249 lr %r7,%r1 # copy svc number to %r7 250sysc_nr_ok: 251 sll %r7,2 # svc number *4 252 l %r10,BASED(.Lsysc_table) 253 tm __TI_flags+2(%r12),_TIF_SYSCALL 254 mvc SP_ARGS(4,%r15),SP_R7(%r15) 255 l %r8,0(%r7,%r10) # get system call addr. 256 bnz BASED(sysc_tracesys) 257 basr %r14,%r8 # call sys_xxxx 258 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 259 260sysc_return: 261 LOCKDEP_SYS_EXIT 262sysc_tif: 263 tm __TI_flags+3(%r12),_TIF_WORK_SVC 264 bnz BASED(sysc_work) # there is work to do (signals etc.) 265sysc_restore: 266 RESTORE_ALL __LC_RETURN_PSW,1 267sysc_done: 268 269# 270# There is work to do, but first we need to check if we return to userspace. 271# 272sysc_work: 273 tm SP_PSW+1(%r15),0x01 # returning to user ? 274 bno BASED(sysc_restore) 275 276# 277# One of the work bits is on. Find out which one. 278# 279sysc_work_tif: 280 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 281 bo BASED(sysc_mcck_pending) 282 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 283 bo BASED(sysc_reschedule) 284 tm __TI_flags+3(%r12),_TIF_SIGPENDING 285 bo BASED(sysc_sigpending) 286 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 287 bo BASED(sysc_notify_resume) 288 tm __TI_flags+3(%r12),_TIF_RESTART_SVC 289 bo BASED(sysc_restart) 290 tm __TI_flags+3(%r12),_TIF_PER_TRAP 291 bo BASED(sysc_singlestep) 292 b BASED(sysc_return) # beware of critical section cleanup 293 294# 295# _TIF_NEED_RESCHED is set, call schedule 296# 297sysc_reschedule: 298 l %r1,BASED(.Lschedule) 299 la %r14,BASED(sysc_return) 300 br %r1 # call scheduler 301 302# 303# _TIF_MCCK_PENDING is set, call handler 304# 305sysc_mcck_pending: 306 l %r1,BASED(.Ls390_handle_mcck) 307 la %r14,BASED(sysc_return) 308 br %r1 # TIF bit will be cleared by handler 309 310# 311# _TIF_SIGPENDING is set, call do_signal 312# 313sysc_sigpending: 314 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP 315 la %r2,SP_PTREGS(%r15) # load pt_regs 316 l %r1,BASED(.Ldo_signal) 317 basr %r14,%r1 # call do_signal 318 tm __TI_flags+3(%r12),_TIF_RESTART_SVC 319 bo BASED(sysc_restart) 320 tm __TI_flags+3(%r12),_TIF_PER_TRAP 321 bo BASED(sysc_singlestep) 322 b BASED(sysc_return) 323 324# 325# _TIF_NOTIFY_RESUME is set, call do_notify_resume 326# 327sysc_notify_resume: 328 la %r2,SP_PTREGS(%r15) # load pt_regs 329 l %r1,BASED(.Ldo_notify_resume) 330 la %r14,BASED(sysc_return) 331 br %r1 # call do_notify_resume 332 333 334# 335# _TIF_RESTART_SVC is set, set up registers and restart svc 336# 337sysc_restart: 338 ni __TI_flags+3(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 339 l %r7,SP_R2(%r15) # load new svc number 340 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 341 lm %r2,%r6,SP_R2(%r15) # load svc arguments 342 sth %r7,SP_SVCNR(%r15) 343 b BASED(sysc_nr_ok) # restart svc 344 345# 346# _TIF_PER_TRAP is set, call do_per_trap 347# 348sysc_singlestep: 349 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP 350 xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number 351 la %r2,SP_PTREGS(%r15) # address of register-save area 352 l %r1,BASED(.Lhandle_per) # load adr. of per handler 353 la %r14,BASED(sysc_return) # load adr. of system return 354 br %r1 # branch to do_per_trap 355 356# 357# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 358# and after the system call 359# 360sysc_tracesys: 361 l %r1,BASED(.Ltrace_entry) 362 la %r2,SP_PTREGS(%r15) # load pt_regs 363 la %r3,0 364 xr %r0,%r0 365 icm %r0,3,SP_SVCNR(%r15) 366 st %r0,SP_R2(%r15) 367 basr %r14,%r1 368 cl %r2,BASED(.Lnr_syscalls) 369 bnl BASED(sysc_tracenogo) 370 lr %r7,%r2 371 sll %r7,2 # svc number *4 372 l %r8,0(%r7,%r10) 373sysc_tracego: 374 lm %r3,%r6,SP_R3(%r15) 375 mvc SP_ARGS(4,%r15),SP_R7(%r15) 376 l %r2,SP_ORIG_R2(%r15) 377 basr %r14,%r8 # call sys_xxx 378 st %r2,SP_R2(%r15) # store return value 379sysc_tracenogo: 380 tm __TI_flags+2(%r12),_TIF_SYSCALL 381 bz BASED(sysc_return) 382 l %r1,BASED(.Ltrace_exit) 383 la %r2,SP_PTREGS(%r15) # load pt_regs 384 la %r14,BASED(sysc_return) 385 br %r1 386 387# 388# a new process exits the kernel with ret_from_fork 389# 390 .globl ret_from_fork 391ret_from_fork: 392 l %r13,__LC_SVC_NEW_PSW+4 393 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 394 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 395 bo BASED(0f) 396 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3970: l %r1,BASED(.Lschedtail) 398 basr %r14,%r1 399 TRACE_IRQS_ON 400 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 401 b BASED(sysc_tracenogo) 402 403# 404# kernel_execve function needs to deal with pt_regs that is not 405# at the usual place 406# 407 .globl kernel_execve 408kernel_execve: 409 stm %r12,%r15,48(%r15) 410 lr %r14,%r15 411 l %r13,__LC_SVC_NEW_PSW+4 412 s %r15,BASED(.Lc_spsize) 413 st %r14,__SF_BACKCHAIN(%r15) 414 la %r12,SP_PTREGS(%r15) 415 xc 0(__PT_SIZE,%r12),0(%r12) 416 l %r1,BASED(.Ldo_execve) 417 lr %r5,%r12 418 basr %r14,%r1 419 ltr %r2,%r2 420 be BASED(0f) 421 a %r15,BASED(.Lc_spsize) 422 lm %r12,%r15,48(%r15) 423 br %r14 424 # execve succeeded. 4250: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 426 l %r15,__LC_KERNEL_STACK # load ksp 427 s %r15,BASED(.Lc_spsize) # make room for registers & psw 428 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 429 l %r12,__LC_THREAD_INFO 430 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 431 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 432 l %r1,BASED(.Lexecve_tail) 433 basr %r14,%r1 434 b BASED(sysc_return) 435 436/* 437 * Program check handler routine 438 */ 439 440 .globl pgm_check_handler 441pgm_check_handler: 442/* 443 * First we need to check for a special case: 444 * Single stepping an instruction that disables the PER event mask will 445 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 446 * For a single stepped SVC the program check handler gets control after 447 * the SVC new PSW has been loaded. But we want to execute the SVC first and 448 * then handle the PER event. Therefore we update the SVC old PSW to point 449 * to the pgm_check_handler and branch to the SVC handler after we checked 450 * if we have to load the kernel stack register. 451 * For every other possible cause for PER event without the PER mask set 452 * we just ignore the PER event (FIXME: is there anything we have to do 453 * for LPSW?). 454 */ 455 stpt __LC_SYNC_ENTER_TIMER 456 SAVE_ALL_BASE __LC_SAVE_AREA 457 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 458 bnz BASED(pgm_per) # got per exception -> special case 459 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 460 CREATE_STACK_FRAME __LC_SAVE_AREA 461 xc SP_ILC(4,%r15),SP_ILC(%r15) 462 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 463 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 464 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 465 bz BASED(pgm_no_vtime) 466 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 467 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 468 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 469pgm_no_vtime: 470 l %r3,__LC_PGM_ILC # load program interruption code 471 l %r4,__LC_TRANS_EXC_CODE 472 REENABLE_IRQS 473 la %r8,0x7f 474 nr %r8,%r3 475 sll %r8,2 476 l %r1,BASED(.Ljump_table) 477 l %r1,0(%r8,%r1) # load address of handler routine 478 la %r2,SP_PTREGS(%r15) # address of register-save area 479 basr %r14,%r1 # branch to interrupt-handler 480pgm_exit: 481 b BASED(sysc_return) 482 483# 484# handle per exception 485# 486pgm_per: 487 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 488 bnz BASED(pgm_per_std) # ok, normal per event from user space 489# ok its one of the special cases, now we need to find out which one 490 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 491 be BASED(pgm_svcper) 492# no interesting special case, ignore PER event 493 lm %r12,%r15,__LC_SAVE_AREA 494 lpsw 0x28 495 496# 497# Normal per exception 498# 499pgm_per_std: 500 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 501 CREATE_STACK_FRAME __LC_SAVE_AREA 502 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 503 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 504 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 505 bz BASED(pgm_no_vtime2) 506 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 507 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 508 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 509pgm_no_vtime2: 510 l %r1,__TI_task(%r12) 511 tm SP_PSW+1(%r15),0x01 # kernel per event ? 512 bz BASED(kernel_per) 513 mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE 514 mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS 515 mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID 516 oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP 517 l %r3,__LC_PGM_ILC # load program interruption code 518 l %r4,__LC_TRANS_EXC_CODE 519 REENABLE_IRQS 520 la %r8,0x7f 521 nr %r8,%r3 # clear per-event-bit and ilc 522 be BASED(pgm_exit2) # only per or per+check ? 523 sll %r8,2 524 l %r1,BASED(.Ljump_table) 525 l %r1,0(%r8,%r1) # load address of handler routine 526 la %r2,SP_PTREGS(%r15) # address of register-save area 527 basr %r14,%r1 # branch to interrupt-handler 528pgm_exit2: 529 b BASED(sysc_return) 530 531# 532# it was a single stepped SVC that is causing all the trouble 533# 534pgm_svcper: 535 SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA 536 CREATE_STACK_FRAME __LC_SAVE_AREA 537 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 538 mvc SP_ILC(4,%r15),__LC_SVC_ILC 539 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 540 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 541 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 542 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 543 l %r8,__TI_task(%r12) 544 mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE 545 mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS 546 mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID 547 oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP 548 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 549 lm %r2,%r6,SP_R2(%r15) # load svc arguments 550 b BASED(sysc_do_svc) 551 552# 553# per was called from kernel, must be kprobes 554# 555kernel_per: 556 REENABLE_IRQS 557 xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) 558 la %r2,SP_PTREGS(%r15) # address of register-save area 559 l %r1,BASED(.Lhandle_per) # load adr. of per handler 560 basr %r14,%r1 # branch to do_single_step 561 b BASED(pgm_exit) 562 563/* 564 * IO interrupt handler routine 565 */ 566 567 .globl io_int_handler 568io_int_handler: 569 stck __LC_INT_CLOCK 570 stpt __LC_ASYNC_ENTER_TIMER 571 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 572 CREATE_STACK_FRAME __LC_SAVE_AREA+16 573 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 574 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 575 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 576 bz BASED(io_no_vtime) 577 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 578 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 579 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 580io_no_vtime: 581 TRACE_IRQS_OFF 582 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 583 la %r2,SP_PTREGS(%r15) # address of register-save area 584 basr %r14,%r1 # branch to standard irq handler 585io_return: 586 LOCKDEP_SYS_EXIT 587 TRACE_IRQS_ON 588io_tif: 589 tm __TI_flags+3(%r12),_TIF_WORK_INT 590 bnz BASED(io_work) # there is work to do (signals etc.) 591io_restore: 592 RESTORE_ALL __LC_RETURN_PSW,0 593io_done: 594 595# 596# There is work todo, find out in which context we have been interrupted: 597# 1) if we return to user space we can do all _TIF_WORK_INT work 598# 2) if we return to kernel code and preemptive scheduling is enabled check 599# the preemption counter and if it is zero call preempt_schedule_irq 600# Before any work can be done, a switch to the kernel stack is required. 601# 602io_work: 603 tm SP_PSW+1(%r15),0x01 # returning to user ? 604 bo BASED(io_work_user) # yes -> do resched & signal 605#ifdef CONFIG_PREEMPT 606 # check for preemptive scheduling 607 icm %r0,15,__TI_precount(%r12) 608 bnz BASED(io_restore) # preemption disabled 609 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 610 bno BASED(io_restore) 611 # switch to kernel stack 612 l %r1,SP_R15(%r15) 613 s %r1,BASED(.Lc_spsize) 614 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 615 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 616 lr %r15,%r1 617 # TRACE_IRQS_ON already done at io_return, call 618 # TRACE_IRQS_OFF to keep things symmetrical 619 TRACE_IRQS_OFF 620 l %r1,BASED(.Lpreempt_schedule_irq) 621 basr %r14,%r1 # call preempt_schedule_irq 622 b BASED(io_return) 623#else 624 b BASED(io_restore) 625#endif 626 627# 628# Need to do work before returning to userspace, switch to kernel stack 629# 630io_work_user: 631 l %r1,__LC_KERNEL_STACK 632 s %r1,BASED(.Lc_spsize) 633 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 634 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 635 lr %r15,%r1 636 637# 638# One of the work bits is on. Find out which one. 639# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED 640# and _TIF_MCCK_PENDING 641# 642io_work_tif: 643 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 644 bo BASED(io_mcck_pending) 645 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 646 bo BASED(io_reschedule) 647 tm __TI_flags+3(%r12),_TIF_SIGPENDING 648 bo BASED(io_sigpending) 649 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 650 bo BASED(io_notify_resume) 651 b BASED(io_return) # beware of critical section cleanup 652 653# 654# _TIF_MCCK_PENDING is set, call handler 655# 656io_mcck_pending: 657 # TRACE_IRQS_ON already done at io_return 658 l %r1,BASED(.Ls390_handle_mcck) 659 basr %r14,%r1 # TIF bit will be cleared by handler 660 TRACE_IRQS_OFF 661 b BASED(io_return) 662 663# 664# _TIF_NEED_RESCHED is set, call schedule 665# 666io_reschedule: 667 # TRACE_IRQS_ON already done at io_return 668 l %r1,BASED(.Lschedule) 669 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 670 basr %r14,%r1 # call scheduler 671 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 672 TRACE_IRQS_OFF 673 b BASED(io_return) 674 675# 676# _TIF_SIGPENDING is set, call do_signal 677# 678io_sigpending: 679 # TRACE_IRQS_ON already done at io_return 680 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 681 la %r2,SP_PTREGS(%r15) # load pt_regs 682 l %r1,BASED(.Ldo_signal) 683 basr %r14,%r1 # call do_signal 684 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 685 TRACE_IRQS_OFF 686 b BASED(io_return) 687 688# 689# _TIF_SIGPENDING is set, call do_signal 690# 691io_notify_resume: 692 # TRACE_IRQS_ON already done at io_return 693 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 694 la %r2,SP_PTREGS(%r15) # load pt_regs 695 l %r1,BASED(.Ldo_notify_resume) 696 basr %r14,%r1 # call do_signal 697 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 698 TRACE_IRQS_OFF 699 b BASED(io_return) 700 701/* 702 * External interrupt handler routine 703 */ 704 705 .globl ext_int_handler 706ext_int_handler: 707 stck __LC_INT_CLOCK 708 stpt __LC_ASYNC_ENTER_TIMER 709 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 710 CREATE_STACK_FRAME __LC_SAVE_AREA+16 711 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 712 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 713 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 714 bz BASED(ext_no_vtime) 715 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 716 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 717 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 718ext_no_vtime: 719 TRACE_IRQS_OFF 720 la %r2,SP_PTREGS(%r15) # address of register-save area 721 l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code 722 l %r4,__LC_EXT_PARAMS # get external parameters 723 l %r1,BASED(.Ldo_extint) 724 basr %r14,%r1 725 b BASED(io_return) 726 727__critical_end: 728 729/* 730 * Machine check handler routines 731 */ 732 733 .globl mcck_int_handler 734mcck_int_handler: 735 stck __LC_MCCK_CLOCK 736 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 737 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 738 SAVE_ALL_BASE __LC_SAVE_AREA+32 739 la %r12,__LC_MCK_OLD_PSW 740 tm __LC_MCCK_CODE,0x80 # system damage? 741 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 742 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 743 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 744 bo BASED(1f) 745 la %r14,__LC_SYNC_ENTER_TIMER 746 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 747 bl BASED(0f) 748 la %r14,__LC_ASYNC_ENTER_TIMER 7490: clc 0(8,%r14),__LC_EXIT_TIMER 750 bl BASED(0f) 751 la %r14,__LC_EXIT_TIMER 7520: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 753 bl BASED(0f) 754 la %r14,__LC_LAST_UPDATE_TIMER 7550: spt 0(%r14) 756 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7571: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 758 bno BASED(mcck_int_main) # no -> skip cleanup critical 759 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 760 bnz BASED(mcck_int_main) # from user -> load async stack 761 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 762 bhe BASED(mcck_int_main) 763 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 764 bl BASED(mcck_int_main) 765 l %r14,BASED(.Lcleanup_critical) 766 basr %r14,%r14 767mcck_int_main: 768 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 769 slr %r14,%r15 770 sra %r14,PAGE_SHIFT 771 be BASED(0f) 772 l %r15,__LC_PANIC_STACK # load panic stack 7730: s %r15,BASED(.Lc_spsize) # make room for registers & psw 774 CREATE_STACK_FRAME __LC_SAVE_AREA+32 775 mvc SP_PSW(8,%r15),0(%r12) 776 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 777 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 778 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 779 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 780 bz BASED(mcck_no_vtime) 781 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER 782 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 783 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER 784mcck_no_vtime: 785 la %r2,SP_PTREGS(%r15) # load pt_regs 786 l %r1,BASED(.Ls390_mcck) 787 basr %r14,%r1 # call machine check handler 788 tm SP_PSW+1(%r15),0x01 # returning to user ? 789 bno BASED(mcck_return) 790 l %r1,__LC_KERNEL_STACK # switch to kernel stack 791 s %r1,BASED(.Lc_spsize) 792 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 793 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 794 lr %r15,%r1 795 stosm __SF_EMPTY(%r15),0x04 # turn dat on 796 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 797 bno BASED(mcck_return) 798 TRACE_IRQS_OFF 799 l %r1,BASED(.Ls390_handle_mcck) 800 basr %r14,%r1 # call machine check handler 801 TRACE_IRQS_ON 802mcck_return: 803 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 804 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 805 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 806 bno BASED(0f) 807 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 808 stpt __LC_EXIT_TIMER 809 lpsw __LC_RETURN_MCCK_PSW # back to caller 8100: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 811 lpsw __LC_RETURN_MCCK_PSW # back to caller 812 813 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 814 815/* 816 * Restart interruption handler, kick starter for additional CPUs 817 */ 818#ifdef CONFIG_SMP 819 __CPUINIT 820 .globl restart_int_handler 821restart_int_handler: 822 basr %r1,0 823restart_base: 824 spt restart_vtime-restart_base(%r1) 825 stck __LC_LAST_UPDATE_CLOCK 826 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 827 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 828 l %r15,__LC_SAVE_AREA+60 # load ksp 829 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 830 lam %a0,%a15,__LC_AREGS_SAVE_AREA 831 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 832 l %r1,__LC_THREAD_INFO 833 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 834 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 835 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 836 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 837 basr %r14,0 838 l %r14,restart_addr-.(%r14) 839 br %r14 # branch to start_secondary 840restart_addr: 841 .long start_secondary 842 .align 8 843restart_vtime: 844 .long 0x7fffffff,0xffffffff 845 .previous 846#else 847/* 848 * If we do not run with SMP enabled, let the new CPU crash ... 849 */ 850 .globl restart_int_handler 851restart_int_handler: 852 basr %r1,0 853restart_base: 854 lpsw restart_crash-restart_base(%r1) 855 .align 8 856restart_crash: 857 .long 0x000a0000,0x00000000 858restart_go: 859#endif 860 861 .section .kprobes.text, "ax" 862 863#ifdef CONFIG_CHECK_STACK 864/* 865 * The synchronous or the asynchronous stack overflowed. We are dead. 866 * No need to properly save the registers, we are going to panic anyway. 867 * Setup a pt_regs so that show_trace can provide a good call trace. 868 */ 869stack_overflow: 870 l %r15,__LC_PANIC_STACK # change to panic stack 871 sl %r15,BASED(.Lc_spsize) 872 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 873 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 874 la %r1,__LC_SAVE_AREA 875 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 876 be BASED(0f) 877 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 878 be BASED(0f) 879 la %r1,__LC_SAVE_AREA+16 8800: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 881 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 882 l %r1,BASED(1f) # branch to kernel_stack_overflow 883 la %r2,SP_PTREGS(%r15) # load pt_regs 884 br %r1 8851: .long kernel_stack_overflow 886#endif 887 888cleanup_table_system_call: 889 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 890cleanup_table_sysc_tif: 891 .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 892cleanup_table_sysc_restore: 893 .long sysc_restore + 0x80000000, sysc_done + 0x80000000 894cleanup_table_io_tif: 895 .long io_tif + 0x80000000, io_restore + 0x80000000 896cleanup_table_io_restore: 897 .long io_restore + 0x80000000, io_done + 0x80000000 898 899cleanup_critical: 900 clc 4(4,%r12),BASED(cleanup_table_system_call) 901 bl BASED(0f) 902 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 903 bl BASED(cleanup_system_call) 9040: 905 clc 4(4,%r12),BASED(cleanup_table_sysc_tif) 906 bl BASED(0f) 907 clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) 908 bl BASED(cleanup_sysc_tif) 9090: 910 clc 4(4,%r12),BASED(cleanup_table_sysc_restore) 911 bl BASED(0f) 912 clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) 913 bl BASED(cleanup_sysc_restore) 9140: 915 clc 4(4,%r12),BASED(cleanup_table_io_tif) 916 bl BASED(0f) 917 clc 4(4,%r12),BASED(cleanup_table_io_tif+4) 918 bl BASED(cleanup_io_tif) 9190: 920 clc 4(4,%r12),BASED(cleanup_table_io_restore) 921 bl BASED(0f) 922 clc 4(4,%r12),BASED(cleanup_table_io_restore+4) 923 bl BASED(cleanup_io_restore) 9240: 925 br %r14 926 927cleanup_system_call: 928 mvc __LC_RETURN_PSW(8),0(%r12) 929 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 930 bh BASED(0f) 931 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 932 c %r12,BASED(.Lmck_old_psw) 933 be BASED(0f) 934 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9350: c %r12,BASED(.Lmck_old_psw) 936 la %r12,__LC_SAVE_AREA+32 937 be BASED(0f) 938 la %r12,__LC_SAVE_AREA+16 9390: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 940 bhe BASED(cleanup_vtime) 941 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 942 bh BASED(0f) 943 mvc __LC_SAVE_AREA(16),0(%r12) 9440: st %r13,4(%r12) 945 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 946 s %r15,BASED(.Lc_spsize) # make room for registers & psw 947 st %r15,12(%r12) 948 CREATE_STACK_FRAME __LC_SAVE_AREA 949 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 950 mvc SP_ILC(4,%r15),__LC_SVC_ILC 951 mvc 0(4,%r12),__LC_THREAD_INFO 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_per_trap 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