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/lowcore.h> 17#include <asm/errno.h> 18#include <asm/ptrace.h> 19#include <asm/thread_info.h> 20#include <asm/asm-offsets.h> 21#include <asm/unistd.h> 22#include <asm/page.h> 23 24/* 25 * Stack layout for the system_call stack entry. 26 * The first few entries are identical to the user_regs_struct. 27 */ 28SP_PTREGS = STACK_FRAME_OVERHEAD 29SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 30SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 31SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 32SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 33SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 34SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 35SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 36SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 37SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 38SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 39SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 40SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 41SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 42SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 43SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 44SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 45SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 46SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 47SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 48SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC 49SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR 50SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 51 52_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 53 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) 54_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 55 _TIF_MCCK_PENDING) 56_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ 57 _TIF_SECCOMP>>8 | _TIF_SYSCALL_FTRACE>>8) 58 59STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 60STACK_SIZE = 1 << STACK_SHIFT 61 62#define BASED(name) name-system_call(%r13) 63 64#ifdef CONFIG_TRACE_IRQFLAGS 65 .macro TRACE_IRQS_ON 66 basr %r2,%r0 67 l %r1,BASED(.Ltrace_irq_on_caller) 68 basr %r14,%r1 69 .endm 70 71 .macro TRACE_IRQS_OFF 72 basr %r2,%r0 73 l %r1,BASED(.Ltrace_irq_off_caller) 74 basr %r14,%r1 75 .endm 76 77 .macro TRACE_IRQS_CHECK 78 basr %r2,%r0 79 tm SP_PSW(%r15),0x03 # irqs enabled? 80 jz 0f 81 l %r1,BASED(.Ltrace_irq_on_caller) 82 basr %r14,%r1 83 j 1f 840: l %r1,BASED(.Ltrace_irq_off_caller) 85 basr %r14,%r1 861: 87 .endm 88#else 89#define TRACE_IRQS_ON 90#define TRACE_IRQS_OFF 91#define TRACE_IRQS_CHECK 92#endif 93 94#ifdef CONFIG_LOCKDEP 95 .macro LOCKDEP_SYS_EXIT 96 tm SP_PSW+1(%r15),0x01 # returning to user ? 97 jz 0f 98 l %r1,BASED(.Llockdep_sys_exit) 99 basr %r14,%r1 1000: 101 .endm 102#else 103#define LOCKDEP_SYS_EXIT 104#endif 105 106/* 107 * Register usage in interrupt handlers: 108 * R9 - pointer to current task structure 109 * R13 - pointer to literal pool 110 * R14 - return register for function calls 111 * R15 - kernel stack pointer 112 */ 113 114 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 115 lm %r10,%r11,\lc_from 116 sl %r10,\lc_to 117 sl %r11,\lc_to+4 118 bc 3,BASED(0f) 119 sl %r10,BASED(.Lc_1) 1200: al %r10,\lc_sum 121 al %r11,\lc_sum+4 122 bc 12,BASED(1f) 123 al %r10,BASED(.Lc_1) 1241: stm %r10,%r11,\lc_sum 125 .endm 126 127 .macro SAVE_ALL_BASE savearea 128 stm %r12,%r15,\savearea 129 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 130 .endm 131 132 .macro SAVE_ALL_SVC psworg,savearea 133 la %r12,\psworg 134 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 135 .endm 136 137 .macro SAVE_ALL_SYNC psworg,savearea 138 la %r12,\psworg 139 tm \psworg+1,0x01 # test problem state bit 140 bz BASED(2f) # skip stack setup save 141 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 142#ifdef CONFIG_CHECK_STACK 143 b BASED(3f) 1442: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 145 bz BASED(stack_overflow) 1463: 147#endif 1482: 149 .endm 150 151 .macro SAVE_ALL_ASYNC psworg,savearea 152 la %r12,\psworg 153 tm \psworg+1,0x01 # test problem state bit 154 bnz BASED(1f) # from user -> load async stack 155 clc \psworg+4(4),BASED(.Lcritical_end) 156 bhe BASED(0f) 157 clc \psworg+4(4),BASED(.Lcritical_start) 158 bl BASED(0f) 159 l %r14,BASED(.Lcleanup_critical) 160 basr %r14,%r14 161 tm 1(%r12),0x01 # retest problem state after cleanup 162 bnz BASED(1f) 1630: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 164 slr %r14,%r15 165 sra %r14,STACK_SHIFT 166 be BASED(2f) 1671: l %r15,__LC_ASYNC_STACK 168#ifdef CONFIG_CHECK_STACK 169 b BASED(3f) 1702: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 171 bz BASED(stack_overflow) 1723: 173#endif 1742: 175 .endm 176 177 .macro CREATE_STACK_FRAME psworg,savearea 178 s %r15,BASED(.Lc_spsize) # make room for registers & psw 179 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 180 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 181 icm %r12,3,__LC_SVC_ILC 182 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 183 st %r12,SP_SVCNR(%r15) 184 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 185 la %r12,0 186 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 187 .endm 188 189 .macro RESTORE_ALL psworg,sync 190 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 191 .if !\sync 192 ni \psworg+1,0xfd # clear wait state bit 193 .endif 194 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 195 stpt __LC_EXIT_TIMER 196 lpsw \psworg # back to caller 197 .endm 198 199/* 200 * Scheduler resume function, called by switch_to 201 * gpr2 = (task_struct *) prev 202 * gpr3 = (task_struct *) next 203 * Returns: 204 * gpr2 = prev 205 */ 206 .globl __switch_to 207__switch_to: 208 basr %r1,0 209__switch_to_base: 210 tm __THREAD_per(%r3),0xe8 # new process is using per ? 211 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 212 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 213 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 214 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 215 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 216__switch_to_noper: 217 l %r4,__THREAD_info(%r2) # get thread_info of prev 218 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 219 bz __switch_to_no_mcck-__switch_to_base(%r1) 220 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 221 l %r4,__THREAD_info(%r3) # get thread_info of next 222 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 223__switch_to_no_mcck: 224 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 225 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 226 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 227 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 228 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 229 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 230 l %r3,__THREAD_info(%r3) # load thread_info from task struct 231 st %r3,__LC_THREAD_INFO 232 ahi %r3,STACK_SIZE 233 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 234 br %r14 235 236__critical_start: 237/* 238 * SVC interrupt handler routine. System calls are synchronous events and 239 * are executed with interrupts enabled. 240 */ 241 242 .globl system_call 243system_call: 244 stpt __LC_SYNC_ENTER_TIMER 245sysc_saveall: 246 SAVE_ALL_BASE __LC_SAVE_AREA 247 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 248 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 249 lh %r7,0x8a # get svc number from lowcore 250sysc_vtime: 251 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 252sysc_stime: 253 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 254sysc_update: 255 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 256sysc_do_svc: 257 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 258 ltr %r7,%r7 # test for svc 0 259 bnz BASED(sysc_nr_ok) # svc number > 0 260 # svc 0: system call number in %r1 261 cl %r1,BASED(.Lnr_syscalls) 262 bnl BASED(sysc_nr_ok) 263 lr %r7,%r1 # copy svc number to %r7 264sysc_nr_ok: 265 mvc SP_ARGS(4,%r15),SP_R7(%r15) 266sysc_do_restart: 267 sth %r7,SP_SVCNR(%r15) 268 sll %r7,2 # svc number *4 269 l %r8,BASED(.Lsysc_table) 270 tm __TI_flags+2(%r9),_TIF_SYSCALL 271 l %r8,0(%r7,%r8) # get system call addr. 272 bnz BASED(sysc_tracesys) 273 basr %r14,%r8 # call sys_xxxx 274 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 275 276sysc_return: 277 tm __TI_flags+3(%r9),_TIF_WORK_SVC 278 bnz BASED(sysc_work) # there is work to do (signals etc.) 279sysc_restore: 280#ifdef CONFIG_TRACE_IRQFLAGS 281 la %r1,BASED(sysc_restore_trace_psw) 282 lpsw 0(%r1) 283sysc_restore_trace: 284 TRACE_IRQS_CHECK 285 LOCKDEP_SYS_EXIT 286#endif 287sysc_leave: 288 RESTORE_ALL __LC_RETURN_PSW,1 289sysc_done: 290 291#ifdef CONFIG_TRACE_IRQFLAGS 292 .align 8 293 .globl sysc_restore_trace_psw 294sysc_restore_trace_psw: 295 .long 0, sysc_restore_trace + 0x80000000 296#endif 297 298# 299# recheck if there is more work to do 300# 301sysc_work_loop: 302 tm __TI_flags+3(%r9),_TIF_WORK_SVC 303 bz BASED(sysc_restore) # there is no work to do 304# 305# One of the work bits is on. Find out which one. 306# 307sysc_work: 308 tm SP_PSW+1(%r15),0x01 # returning to user ? 309 bno BASED(sysc_restore) 310 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 311 bo BASED(sysc_mcck_pending) 312 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 313 bo BASED(sysc_reschedule) 314 tm __TI_flags+3(%r9),_TIF_SIGPENDING 315 bnz BASED(sysc_sigpending) 316 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 317 bnz BASED(sysc_notify_resume) 318 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 319 bo BASED(sysc_restart) 320 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 321 bo BASED(sysc_singlestep) 322 b BASED(sysc_restore) 323sysc_work_done: 324 325# 326# _TIF_NEED_RESCHED is set, call schedule 327# 328sysc_reschedule: 329 l %r1,BASED(.Lschedule) 330 la %r14,BASED(sysc_work_loop) 331 br %r1 # call scheduler 332 333# 334# _TIF_MCCK_PENDING is set, call handler 335# 336sysc_mcck_pending: 337 l %r1,BASED(.Ls390_handle_mcck) 338 la %r14,BASED(sysc_work_loop) 339 br %r1 # TIF bit will be cleared by handler 340 341# 342# _TIF_SIGPENDING is set, call do_signal 343# 344sysc_sigpending: 345 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 346 la %r2,SP_PTREGS(%r15) # load pt_regs 347 l %r1,BASED(.Ldo_signal) 348 basr %r14,%r1 # call do_signal 349 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 350 bo BASED(sysc_restart) 351 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 352 bo BASED(sysc_singlestep) 353 b BASED(sysc_work_loop) 354 355# 356# _TIF_NOTIFY_RESUME is set, call do_notify_resume 357# 358sysc_notify_resume: 359 la %r2,SP_PTREGS(%r15) # load pt_regs 360 l %r1,BASED(.Ldo_notify_resume) 361 la %r14,BASED(sysc_work_loop) 362 br %r1 # call do_notify_resume 363 364 365# 366# _TIF_RESTART_SVC is set, set up registers and restart svc 367# 368sysc_restart: 369 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 370 l %r7,SP_R2(%r15) # load new svc number 371 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 372 lm %r2,%r6,SP_R2(%r15) # load svc arguments 373 b BASED(sysc_do_restart) # restart svc 374 375# 376# _TIF_SINGLE_STEP is set, call do_single_step 377# 378sysc_singlestep: 379 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 380 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 381 mvi SP_SVCNR+1(%r15),0xff 382 la %r2,SP_PTREGS(%r15) # address of register-save area 383 l %r1,BASED(.Lhandle_per) # load adr. of per handler 384 la %r14,BASED(sysc_return) # load adr. of system return 385 br %r1 # branch to do_single_step 386 387# 388# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 389# and after the system call 390# 391sysc_tracesys: 392 l %r1,BASED(.Ltrace_entry) 393 la %r2,SP_PTREGS(%r15) # load pt_regs 394 la %r3,0 395 srl %r7,2 396 st %r7,SP_R2(%r15) 397 basr %r14,%r1 398 cl %r2,BASED(.Lnr_syscalls) 399 bnl BASED(sysc_tracenogo) 400 l %r8,BASED(.Lsysc_table) 401 lr %r7,%r2 402 sll %r7,2 # svc number *4 403 l %r8,0(%r7,%r8) 404sysc_tracego: 405 lm %r3,%r6,SP_R3(%r15) 406 l %r2,SP_ORIG_R2(%r15) 407 basr %r14,%r8 # call sys_xxx 408 st %r2,SP_R2(%r15) # store return value 409sysc_tracenogo: 410 tm __TI_flags+2(%r9),_TIF_SYSCALL 411 bz BASED(sysc_return) 412 l %r1,BASED(.Ltrace_exit) 413 la %r2,SP_PTREGS(%r15) # load pt_regs 414 la %r14,BASED(sysc_return) 415 br %r1 416 417# 418# a new process exits the kernel with ret_from_fork 419# 420 .globl ret_from_fork 421ret_from_fork: 422 l %r13,__LC_SVC_NEW_PSW+4 423 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 424 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 425 bo BASED(0f) 426 st %r15,SP_R15(%r15) # store stack pointer for new kthread 4270: l %r1,BASED(.Lschedtail) 428 basr %r14,%r1 429 TRACE_IRQS_ON 430 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 431 b BASED(sysc_tracenogo) 432 433# 434# kernel_execve function needs to deal with pt_regs that is not 435# at the usual place 436# 437 .globl kernel_execve 438kernel_execve: 439 stm %r12,%r15,48(%r15) 440 lr %r14,%r15 441 l %r13,__LC_SVC_NEW_PSW+4 442 s %r15,BASED(.Lc_spsize) 443 st %r14,__SF_BACKCHAIN(%r15) 444 la %r12,SP_PTREGS(%r15) 445 xc 0(__PT_SIZE,%r12),0(%r12) 446 l %r1,BASED(.Ldo_execve) 447 lr %r5,%r12 448 basr %r14,%r1 449 ltr %r2,%r2 450 be BASED(0f) 451 a %r15,BASED(.Lc_spsize) 452 lm %r12,%r15,48(%r15) 453 br %r14 454 # execve succeeded. 4550: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 456 l %r15,__LC_KERNEL_STACK # load ksp 457 s %r15,BASED(.Lc_spsize) # make room for registers & psw 458 l %r9,__LC_THREAD_INFO 459 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 460 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 461 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 462 l %r1,BASED(.Lexecve_tail) 463 basr %r14,%r1 464 b BASED(sysc_return) 465 466/* 467 * Program check handler routine 468 */ 469 470 .globl pgm_check_handler 471pgm_check_handler: 472/* 473 * First we need to check for a special case: 474 * Single stepping an instruction that disables the PER event mask will 475 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 476 * For a single stepped SVC the program check handler gets control after 477 * the SVC new PSW has been loaded. But we want to execute the SVC first and 478 * then handle the PER event. Therefore we update the SVC old PSW to point 479 * to the pgm_check_handler and branch to the SVC handler after we checked 480 * if we have to load the kernel stack register. 481 * For every other possible cause for PER event without the PER mask set 482 * we just ignore the PER event (FIXME: is there anything we have to do 483 * for LPSW?). 484 */ 485 stpt __LC_SYNC_ENTER_TIMER 486 SAVE_ALL_BASE __LC_SAVE_AREA 487 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 488 bnz BASED(pgm_per) # got per exception -> special case 489 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 490 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 491 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 492 bz BASED(pgm_no_vtime) 493 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 494 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 495 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 496pgm_no_vtime: 497 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 498 TRACE_IRQS_OFF 499 l %r3,__LC_PGM_ILC # load program interruption code 500 la %r8,0x7f 501 nr %r8,%r3 502pgm_do_call: 503 l %r7,BASED(.Ljump_table) 504 sll %r8,2 505 l %r7,0(%r8,%r7) # load address of handler routine 506 la %r2,SP_PTREGS(%r15) # address of register-save area 507 la %r14,BASED(sysc_return) 508 br %r7 # branch to interrupt-handler 509 510# 511# handle per exception 512# 513pgm_per: 514 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 515 bnz BASED(pgm_per_std) # ok, normal per event from user space 516# ok its one of the special cases, now we need to find out which one 517 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 518 be BASED(pgm_svcper) 519# no interesting special case, ignore PER event 520 lm %r12,%r15,__LC_SAVE_AREA 521 lpsw 0x28 522 523# 524# Normal per exception 525# 526pgm_per_std: 527 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 528 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 529 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 530 bz BASED(pgm_no_vtime2) 531 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 532 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 533 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 534pgm_no_vtime2: 535 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 536 TRACE_IRQS_OFF 537 l %r1,__TI_task(%r9) 538 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 539 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 540 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 541 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 542 tm SP_PSW+1(%r15),0x01 # kernel per event ? 543 bz BASED(kernel_per) 544 l %r3,__LC_PGM_ILC # load program interruption code 545 la %r8,0x7f 546 nr %r8,%r3 # clear per-event-bit and ilc 547 be BASED(sysc_return) # only per or per+check ? 548 b BASED(pgm_do_call) 549 550# 551# it was a single stepped SVC that is causing all the trouble 552# 553pgm_svcper: 554 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 555 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 556 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 557 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 558 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 559 lh %r7,0x8a # get svc number from lowcore 560 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 561 TRACE_IRQS_OFF 562 l %r1,__TI_task(%r9) 563 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 564 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 565 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 566 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 567 TRACE_IRQS_ON 568 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 569 b BASED(sysc_do_svc) 570 571# 572# per was called from kernel, must be kprobes 573# 574kernel_per: 575 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 576 mvi SP_SVCNR+1(%r15),0xff 577 la %r2,SP_PTREGS(%r15) # address of register-save area 578 l %r1,BASED(.Lhandle_per) # load adr. of per handler 579 la %r14,BASED(sysc_restore)# load adr. of system return 580 br %r1 # branch to do_single_step 581 582/* 583 * IO interrupt handler routine 584 */ 585 586 .globl io_int_handler 587io_int_handler: 588 stck __LC_INT_CLOCK 589 stpt __LC_ASYNC_ENTER_TIMER 590 SAVE_ALL_BASE __LC_SAVE_AREA+16 591 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 592 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 593 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 594 bz BASED(io_no_vtime) 595 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 596 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 597 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 598io_no_vtime: 599 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 600 TRACE_IRQS_OFF 601 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 602 la %r2,SP_PTREGS(%r15) # address of register-save area 603 basr %r14,%r1 # branch to standard irq handler 604io_return: 605 tm __TI_flags+3(%r9),_TIF_WORK_INT 606 bnz BASED(io_work) # there is work to do (signals etc.) 607io_restore: 608#ifdef CONFIG_TRACE_IRQFLAGS 609 la %r1,BASED(io_restore_trace_psw) 610 lpsw 0(%r1) 611io_restore_trace: 612 TRACE_IRQS_CHECK 613 LOCKDEP_SYS_EXIT 614#endif 615io_leave: 616 RESTORE_ALL __LC_RETURN_PSW,0 617io_done: 618 619#ifdef CONFIG_TRACE_IRQFLAGS 620 .align 8 621 .globl io_restore_trace_psw 622io_restore_trace_psw: 623 .long 0, io_restore_trace + 0x80000000 624#endif 625 626# 627# switch to kernel stack, then check the TIF bits 628# 629io_work: 630 tm SP_PSW+1(%r15),0x01 # returning to user ? 631#ifndef CONFIG_PREEMPT 632 bno BASED(io_restore) # no-> skip resched & signal 633#else 634 bnz BASED(io_work_user) # no -> check for preemptive scheduling 635 # check for preemptive scheduling 636 icm %r0,15,__TI_precount(%r9) 637 bnz BASED(io_restore) # preemption disabled 638 l %r1,SP_R15(%r15) 639 s %r1,BASED(.Lc_spsize) 640 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 641 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 642 lr %r15,%r1 643io_resume_loop: 644 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 645 bno BASED(io_restore) 646 l %r1,BASED(.Lpreempt_schedule_irq) 647 la %r14,BASED(io_resume_loop) 648 br %r1 # call schedule 649#endif 650 651io_work_user: 652 l %r1,__LC_KERNEL_STACK 653 s %r1,BASED(.Lc_spsize) 654 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 655 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 656 lr %r15,%r1 657# 658# One of the work bits is on. Find out which one. 659# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED 660# and _TIF_MCCK_PENDING 661# 662io_work_loop: 663 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 664 bo BASED(io_mcck_pending) 665 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 666 bo BASED(io_reschedule) 667 tm __TI_flags+3(%r9),_TIF_SIGPENDING 668 bnz BASED(io_sigpending) 669 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 670 bnz BASED(io_notify_resume) 671 b BASED(io_restore) 672io_work_done: 673 674# 675# _TIF_MCCK_PENDING is set, call handler 676# 677io_mcck_pending: 678 l %r1,BASED(.Ls390_handle_mcck) 679 basr %r14,%r1 # TIF bit will be cleared by handler 680 b BASED(io_work_loop) 681 682# 683# _TIF_NEED_RESCHED is set, call schedule 684# 685io_reschedule: 686 TRACE_IRQS_ON 687 l %r1,BASED(.Lschedule) 688 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 689 basr %r14,%r1 # call scheduler 690 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 691 TRACE_IRQS_OFF 692 tm __TI_flags+3(%r9),_TIF_WORK_INT 693 bz BASED(io_restore) # there is no work to do 694 b BASED(io_work_loop) 695 696# 697# _TIF_SIGPENDING is set, call do_signal 698# 699io_sigpending: 700 TRACE_IRQS_ON 701 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 702 la %r2,SP_PTREGS(%r15) # load pt_regs 703 l %r1,BASED(.Ldo_signal) 704 basr %r14,%r1 # call do_signal 705 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 706 TRACE_IRQS_OFF 707 b BASED(io_work_loop) 708 709# 710# _TIF_SIGPENDING is set, call do_signal 711# 712io_notify_resume: 713 TRACE_IRQS_ON 714 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 715 la %r2,SP_PTREGS(%r15) # load pt_regs 716 l %r1,BASED(.Ldo_notify_resume) 717 basr %r14,%r1 # call do_signal 718 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 719 TRACE_IRQS_OFF 720 b BASED(io_work_loop) 721 722/* 723 * External interrupt handler routine 724 */ 725 726 .globl ext_int_handler 727ext_int_handler: 728 stck __LC_INT_CLOCK 729 stpt __LC_ASYNC_ENTER_TIMER 730 SAVE_ALL_BASE __LC_SAVE_AREA+16 731 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 732 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 733 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 734 bz BASED(ext_no_vtime) 735 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 736 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 737 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 738ext_no_vtime: 739 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 740 TRACE_IRQS_OFF 741 la %r2,SP_PTREGS(%r15) # address of register-save area 742 lh %r3,__LC_EXT_INT_CODE # get interruption code 743 l %r1,BASED(.Ldo_extint) 744 basr %r14,%r1 745 b BASED(io_return) 746 747__critical_end: 748 749/* 750 * Machine check handler routines 751 */ 752 753 .globl mcck_int_handler 754mcck_int_handler: 755 stck __LC_INT_CLOCK 756 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 757 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 758 SAVE_ALL_BASE __LC_SAVE_AREA+32 759 la %r12,__LC_MCK_OLD_PSW 760 tm __LC_MCCK_CODE,0x80 # system damage? 761 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 762 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 763 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 764 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 765 bo BASED(1f) 766 la %r14,__LC_SYNC_ENTER_TIMER 767 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 768 bl BASED(0f) 769 la %r14,__LC_ASYNC_ENTER_TIMER 7700: clc 0(8,%r14),__LC_EXIT_TIMER 771 bl BASED(0f) 772 la %r14,__LC_EXIT_TIMER 7730: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 774 bl BASED(0f) 775 la %r14,__LC_LAST_UPDATE_TIMER 7760: spt 0(%r14) 777 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7781: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 779 bno BASED(mcck_int_main) # no -> skip cleanup critical 780 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 781 bnz BASED(mcck_int_main) # from user -> load async stack 782 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 783 bhe BASED(mcck_int_main) 784 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 785 bl BASED(mcck_int_main) 786 l %r14,BASED(.Lcleanup_critical) 787 basr %r14,%r14 788mcck_int_main: 789 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 790 slr %r14,%r15 791 sra %r14,PAGE_SHIFT 792 be BASED(0f) 793 l %r15,__LC_PANIC_STACK # load panic stack 7940: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 795 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 796 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 797 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 798 bz BASED(mcck_no_vtime) 799 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 800 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 801 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 802mcck_no_vtime: 803 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 804 la %r2,SP_PTREGS(%r15) # load pt_regs 805 l %r1,BASED(.Ls390_mcck) 806 basr %r14,%r1 # call machine check handler 807 tm SP_PSW+1(%r15),0x01 # returning to user ? 808 bno BASED(mcck_return) 809 l %r1,__LC_KERNEL_STACK # switch to kernel stack 810 s %r1,BASED(.Lc_spsize) 811 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 812 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 813 lr %r15,%r1 814 stosm __SF_EMPTY(%r15),0x04 # turn dat on 815 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 816 bno BASED(mcck_return) 817 TRACE_IRQS_OFF 818 l %r1,BASED(.Ls390_handle_mcck) 819 basr %r14,%r1 # call machine check handler 820 TRACE_IRQS_ON 821mcck_return: 822 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 823 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 824 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 825 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 826 bno BASED(0f) 827 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 828 stpt __LC_EXIT_TIMER 829 lpsw __LC_RETURN_MCCK_PSW # back to caller 8300: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 831 lpsw __LC_RETURN_MCCK_PSW # back to caller 832 833 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 834 835/* 836 * Restart interruption handler, kick starter for additional CPUs 837 */ 838#ifdef CONFIG_SMP 839 __CPUINIT 840 .globl restart_int_handler 841restart_int_handler: 842 basr %r1,0 843restart_base: 844 spt restart_vtime-restart_base(%r1) 845 stck __LC_LAST_UPDATE_CLOCK 846 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 847 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 848 l %r15,__LC_SAVE_AREA+60 # load ksp 849 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 850 lam %a0,%a15,__LC_AREGS_SAVE_AREA 851 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 852 l %r1,__LC_THREAD_INFO 853 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 854 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 855 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 856 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 857 basr %r14,0 858 l %r14,restart_addr-.(%r14) 859 br %r14 # branch to start_secondary 860restart_addr: 861 .long start_secondary 862 .align 8 863restart_vtime: 864 .long 0x7fffffff,0xffffffff 865 .previous 866#else 867/* 868 * If we do not run with SMP enabled, let the new CPU crash ... 869 */ 870 .globl restart_int_handler 871restart_int_handler: 872 basr %r1,0 873restart_base: 874 lpsw restart_crash-restart_base(%r1) 875 .align 8 876restart_crash: 877 .long 0x000a0000,0x00000000 878restart_go: 879#endif 880 881#ifdef CONFIG_CHECK_STACK 882/* 883 * The synchronous or the asynchronous stack overflowed. We are dead. 884 * No need to properly save the registers, we are going to panic anyway. 885 * Setup a pt_regs so that show_trace can provide a good call trace. 886 */ 887stack_overflow: 888 l %r15,__LC_PANIC_STACK # change to panic stack 889 sl %r15,BASED(.Lc_spsize) 890 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 891 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 892 la %r1,__LC_SAVE_AREA 893 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 894 be BASED(0f) 895 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 896 be BASED(0f) 897 la %r1,__LC_SAVE_AREA+16 8980: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 899 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 900 l %r1,BASED(1f) # branch to kernel_stack_overflow 901 la %r2,SP_PTREGS(%r15) # load pt_regs 902 br %r1 9031: .long kernel_stack_overflow 904#endif 905 906cleanup_table_system_call: 907 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 908cleanup_table_sysc_return: 909 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 910cleanup_table_sysc_leave: 911 .long sysc_leave + 0x80000000, sysc_done + 0x80000000 912cleanup_table_sysc_work_loop: 913 .long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000 914cleanup_table_io_return: 915 .long io_return + 0x80000000, io_leave + 0x80000000 916cleanup_table_io_leave: 917 .long io_leave + 0x80000000, io_done + 0x80000000 918cleanup_table_io_work_loop: 919 .long io_work_loop + 0x80000000, io_work_done + 0x80000000 920 921cleanup_critical: 922 clc 4(4,%r12),BASED(cleanup_table_system_call) 923 bl BASED(0f) 924 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 925 bl BASED(cleanup_system_call) 9260: 927 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 928 bl BASED(0f) 929 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 930 bl BASED(cleanup_sysc_return) 9310: 932 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 933 bl BASED(0f) 934 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 935 bl BASED(cleanup_sysc_leave) 9360: 937 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 938 bl BASED(0f) 939 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 940 bl BASED(cleanup_sysc_return) 9410: 942 clc 4(4,%r12),BASED(cleanup_table_io_return) 943 bl BASED(0f) 944 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 945 bl BASED(cleanup_io_return) 9460: 947 clc 4(4,%r12),BASED(cleanup_table_io_leave) 948 bl BASED(0f) 949 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 950 bl BASED(cleanup_io_leave) 9510: 952 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 953 bl BASED(0f) 954 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 955 bl BASED(cleanup_io_return) 9560: 957 br %r14 958 959cleanup_system_call: 960 mvc __LC_RETURN_PSW(8),0(%r12) 961 c %r12,BASED(.Lmck_old_psw) 962 be BASED(0f) 963 la %r12,__LC_SAVE_AREA+16 964 b BASED(1f) 9650: la %r12,__LC_SAVE_AREA+32 9661: 967 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 968 bh BASED(0f) 969 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9700: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 971 bhe BASED(cleanup_vtime) 972 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 973 bh BASED(0f) 974 mvc __LC_SAVE_AREA(16),0(%r12) 9750: st %r13,4(%r12) 976 st %r12,__LC_SAVE_AREA+48 # argh 977 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 978 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 979 l %r12,__LC_SAVE_AREA+48 # argh 980 st %r15,12(%r12) 981 lh %r7,0x8a 982cleanup_vtime: 983 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 984 bhe BASED(cleanup_stime) 985 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 986cleanup_stime: 987 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 988 bh BASED(cleanup_update) 989 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 990cleanup_update: 991 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 992 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 993 la %r12,__LC_RETURN_PSW 994 br %r14 995cleanup_system_call_insn: 996 .long sysc_saveall + 0x80000000 997 .long system_call + 0x80000000 998 .long sysc_vtime + 0x80000000 999 .long sysc_stime + 0x80000000 1000 .long sysc_update + 0x80000000 1001 1002cleanup_sysc_return: 1003 mvc __LC_RETURN_PSW(4),0(%r12) 1004 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 1005 la %r12,__LC_RETURN_PSW 1006 br %r14 1007 1008cleanup_sysc_leave: 1009 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 1010 be BASED(2f) 1011 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1012 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 1013 be BASED(2f) 1014 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1015 c %r12,BASED(.Lmck_old_psw) 1016 bne BASED(0f) 1017 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1018 b BASED(1f) 10190: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10201: lm %r0,%r11,SP_R0(%r15) 1021 l %r15,SP_R15(%r15) 10222: la %r12,__LC_RETURN_PSW 1023 br %r14 1024cleanup_sysc_leave_insn: 1025 .long sysc_done - 4 + 0x80000000 1026 .long sysc_done - 8 + 0x80000000 1027 1028cleanup_io_return: 1029 mvc __LC_RETURN_PSW(4),0(%r12) 1030 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 1031 la %r12,__LC_RETURN_PSW 1032 br %r14 1033 1034cleanup_io_leave: 1035 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 1036 be BASED(2f) 1037 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1038 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 1039 be BASED(2f) 1040 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1041 c %r12,BASED(.Lmck_old_psw) 1042 bne BASED(0f) 1043 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1044 b BASED(1f) 10450: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10461: lm %r0,%r11,SP_R0(%r15) 1047 l %r15,SP_R15(%r15) 10482: la %r12,__LC_RETURN_PSW 1049 br %r14 1050cleanup_io_leave_insn: 1051 .long io_done - 4 + 0x80000000 1052 .long io_done - 8 + 0x80000000 1053 1054/* 1055 * Integer constants 1056 */ 1057 .align 4 1058.Lc_spsize: .long SP_SIZE 1059.Lc_overhead: .long STACK_FRAME_OVERHEAD 1060.Lnr_syscalls: .long NR_syscalls 1061.L0x018: .short 0x018 1062.L0x020: .short 0x020 1063.L0x028: .short 0x028 1064.L0x030: .short 0x030 1065.L0x038: .short 0x038 1066.Lc_1: .long 1 1067 1068/* 1069 * Symbol constants 1070 */ 1071.Ls390_mcck: .long s390_do_machine_check 1072.Ls390_handle_mcck: 1073 .long s390_handle_mcck 1074.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1075.Ldo_IRQ: .long do_IRQ 1076.Ldo_extint: .long do_extint 1077.Ldo_signal: .long do_signal 1078.Ldo_notify_resume: 1079 .long do_notify_resume 1080.Lhandle_per: .long do_single_step 1081.Ldo_execve: .long do_execve 1082.Lexecve_tail: .long execve_tail 1083.Ljump_table: .long pgm_check_table 1084.Lschedule: .long schedule 1085#ifdef CONFIG_PREEMPT 1086.Lpreempt_schedule_irq: 1087 .long preempt_schedule_irq 1088#endif 1089.Ltrace_entry: .long do_syscall_trace_enter 1090.Ltrace_exit: .long do_syscall_trace_exit 1091.Lschedtail: .long schedule_tail 1092.Lsysc_table: .long sys_call_table 1093#ifdef CONFIG_TRACE_IRQFLAGS 1094.Ltrace_irq_on_caller: 1095 .long trace_hardirqs_on_caller 1096.Ltrace_irq_off_caller: 1097 .long trace_hardirqs_off_caller 1098#endif 1099#ifdef CONFIG_LOCKDEP 1100.Llockdep_sys_exit: 1101 .long lockdep_sys_exit 1102#endif 1103.Lcritical_start: 1104 .long __critical_start + 0x80000000 1105.Lcritical_end: 1106 .long __critical_end + 0x80000000 1107.Lcleanup_critical: 1108 .long cleanup_critical 1109 1110 .section .rodata, "a" 1111#define SYSCALL(esa,esame,emu) .long esa 1112 .globl sys_call_table 1113sys_call_table: 1114#include "syscalls.S" 1115#undef SYSCALL 1116