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 <asm/cache.h> 15#include <asm/lowcore.h> 16#include <asm/errno.h> 17#include <asm/ptrace.h> 18#include <asm/thread_info.h> 19#include <asm/asm-offsets.h> 20#include <asm/unistd.h> 21#include <asm/page.h> 22 23/* 24 * Stack layout for the system_call stack entry. 25 * The first few entries are identical to the user_regs_struct. 26 */ 27SP_PTREGS = STACK_FRAME_OVERHEAD 28SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 29SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 30SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 31SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 32SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 33SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 34SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 35SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 36SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 37SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 38SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 39SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 40SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 41SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 42SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 43SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 44SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 45SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 46SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 47SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC 48SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP 49SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 50 51_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \ 52 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) 53_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \ 54 _TIF_MCCK_PENDING) 55 56STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 57STACK_SIZE = 1 << STACK_SHIFT 58 59#define BASED(name) name-system_call(%r13) 60 61#ifdef CONFIG_TRACE_IRQFLAGS 62 .macro TRACE_IRQS_ON 63 l %r1,BASED(.Ltrace_irq_on) 64 basr %r14,%r1 65 .endm 66 67 .macro TRACE_IRQS_OFF 68 l %r1,BASED(.Ltrace_irq_off) 69 basr %r14,%r1 70 .endm 71#else 72#define TRACE_IRQS_ON 73#define TRACE_IRQS_OFF 74#endif 75 76/* 77 * Register usage in interrupt handlers: 78 * R9 - pointer to current task structure 79 * R13 - pointer to literal pool 80 * R14 - return register for function calls 81 * R15 - kernel stack pointer 82 */ 83 84 .macro STORE_TIMER lc_offset 85#ifdef CONFIG_VIRT_CPU_ACCOUNTING 86 stpt \lc_offset 87#endif 88 .endm 89 90#ifdef CONFIG_VIRT_CPU_ACCOUNTING 91 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 92 lm %r10,%r11,\lc_from 93 sl %r10,\lc_to 94 sl %r11,\lc_to+4 95 bc 3,BASED(0f) 96 sl %r10,BASED(.Lc_1) 970: al %r10,\lc_sum 98 al %r11,\lc_sum+4 99 bc 12,BASED(1f) 100 al %r10,BASED(.Lc_1) 1011: stm %r10,%r11,\lc_sum 102 .endm 103#endif 104 105 .macro SAVE_ALL_BASE savearea 106 stm %r12,%r15,\savearea 107 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 108 .endm 109 110 .macro SAVE_ALL_SYNC psworg,savearea 111 la %r12,\psworg 112 tm \psworg+1,0x01 # test problem state bit 113 bz BASED(2f) # skip stack setup save 114 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 115#ifdef CONFIG_CHECK_STACK 116 b BASED(3f) 1172: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 118 bz BASED(stack_overflow) 1193: 120#endif 1212: 122 .endm 123 124 .macro SAVE_ALL_ASYNC psworg,savearea 125 la %r12,\psworg 126 tm \psworg+1,0x01 # test problem state bit 127 bnz BASED(1f) # from user -> load async stack 128 clc \psworg+4(4),BASED(.Lcritical_end) 129 bhe BASED(0f) 130 clc \psworg+4(4),BASED(.Lcritical_start) 131 bl BASED(0f) 132 l %r14,BASED(.Lcleanup_critical) 133 basr %r14,%r14 134 tm 1(%r12),0x01 # retest problem state after cleanup 135 bnz BASED(1f) 1360: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 137 slr %r14,%r15 138 sra %r14,STACK_SHIFT 139 be BASED(2f) 1401: l %r15,__LC_ASYNC_STACK 141#ifdef CONFIG_CHECK_STACK 142 b BASED(3f) 1432: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 144 bz BASED(stack_overflow) 1453: 146#endif 1472: 148 .endm 149 150 .macro CREATE_STACK_FRAME psworg,savearea 151 s %r15,BASED(.Lc_spsize) # make room for registers & psw 152 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 153 la %r12,\psworg 154 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 155 icm %r12,12,__LC_SVC_ILC 156 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 157 st %r12,SP_ILC(%r15) 158 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 159 la %r12,0 160 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 161 .endm 162 163 .macro RESTORE_ALL psworg,sync 164 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 165 .if !\sync 166 ni \psworg+1,0xfd # clear wait state bit 167 .endif 168 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 169 STORE_TIMER __LC_EXIT_TIMER 170 lpsw \psworg # back to caller 171 .endm 172 173/* 174 * Scheduler resume function, called by switch_to 175 * gpr2 = (task_struct *) prev 176 * gpr3 = (task_struct *) next 177 * Returns: 178 * gpr2 = prev 179 */ 180 .globl __switch_to 181__switch_to: 182 basr %r1,0 183__switch_to_base: 184 tm __THREAD_per(%r3),0xe8 # new process is using per ? 185 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 186 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 187 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 188 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 189 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 190__switch_to_noper: 191 l %r4,__THREAD_info(%r2) # get thread_info of prev 192 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 193 bz __switch_to_no_mcck-__switch_to_base(%r1) 194 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 195 l %r4,__THREAD_info(%r3) # get thread_info of next 196 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 197__switch_to_no_mcck: 198 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 199 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 200 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 201 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 202 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 203 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 204 l %r3,__THREAD_info(%r3) # load thread_info from task struct 205 st %r3,__LC_THREAD_INFO 206 ahi %r3,STACK_SIZE 207 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 208 br %r14 209 210__critical_start: 211/* 212 * SVC interrupt handler routine. System calls are synchronous events and 213 * are executed with interrupts enabled. 214 */ 215 216 .globl system_call 217system_call: 218 STORE_TIMER __LC_SYNC_ENTER_TIMER 219sysc_saveall: 220 SAVE_ALL_BASE __LC_SAVE_AREA 221 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 222 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 223 lh %r7,0x8a # get svc number from lowcore 224#ifdef CONFIG_VIRT_CPU_ACCOUNTING 225sysc_vtime: 226 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 227 bz BASED(sysc_do_svc) 228 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 229sysc_stime: 230 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 231sysc_update: 232 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 233#endif 234sysc_do_svc: 235 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 236 sla %r7,2 # *4 and test for svc 0 237 bnz BASED(sysc_nr_ok) # svc number > 0 238 # svc 0: system call number in %r1 239 cl %r1,BASED(.Lnr_syscalls) 240 bnl BASED(sysc_nr_ok) 241 lr %r7,%r1 # copy svc number to %r7 242 sla %r7,2 # *4 243sysc_nr_ok: 244 mvc SP_ARGS(4,%r15),SP_R7(%r15) 245sysc_do_restart: 246 l %r8,BASED(.Lsysc_table) 247 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 248 l %r8,0(%r7,%r8) # get system call addr. 249 bnz BASED(sysc_tracesys) 250 basr %r14,%r8 # call sys_xxxx 251 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 252 # ATTENTION: check sys_execve_glue before 253 # changing anything here !! 254 255sysc_return: 256 tm SP_PSW+1(%r15),0x01 # returning to user ? 257 bno BASED(sysc_leave) 258 tm __TI_flags+3(%r9),_TIF_WORK_SVC 259 bnz BASED(sysc_work) # there is work to do (signals etc.) 260sysc_leave: 261 RESTORE_ALL __LC_RETURN_PSW,1 262 263# 264# recheck if there is more work to do 265# 266sysc_work_loop: 267 tm __TI_flags+3(%r9),_TIF_WORK_SVC 268 bz BASED(sysc_leave) # there is no work to do 269# 270# One of the work bits is on. Find out which one. 271# 272sysc_work: 273 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 274 bo BASED(sysc_mcck_pending) 275 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 276 bo BASED(sysc_reschedule) 277 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 278 bnz BASED(sysc_sigpending) 279 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 280 bo BASED(sysc_restart) 281 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 282 bo BASED(sysc_singlestep) 283 b BASED(sysc_leave) 284 285# 286# _TIF_NEED_RESCHED is set, call schedule 287# 288sysc_reschedule: 289 l %r1,BASED(.Lschedule) 290 la %r14,BASED(sysc_work_loop) 291 br %r1 # call scheduler 292 293# 294# _TIF_MCCK_PENDING is set, call handler 295# 296sysc_mcck_pending: 297 l %r1,BASED(.Ls390_handle_mcck) 298 la %r14,BASED(sysc_work_loop) 299 br %r1 # TIF bit will be cleared by handler 300 301# 302# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 303# 304sysc_sigpending: 305 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 306 la %r2,SP_PTREGS(%r15) # load pt_regs 307 l %r1,BASED(.Ldo_signal) 308 basr %r14,%r1 # call do_signal 309 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 310 bo BASED(sysc_restart) 311 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 312 bo BASED(sysc_singlestep) 313 b BASED(sysc_work_loop) 314 315# 316# _TIF_RESTART_SVC is set, set up registers and restart svc 317# 318sysc_restart: 319 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 320 l %r7,SP_R2(%r15) # load new svc number 321 sla %r7,2 322 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 323 lm %r2,%r6,SP_R2(%r15) # load svc arguments 324 b BASED(sysc_do_restart) # restart svc 325 326# 327# _TIF_SINGLE_STEP is set, call do_single_step 328# 329sysc_singlestep: 330 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 331 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 332 la %r2,SP_PTREGS(%r15) # address of register-save area 333 l %r1,BASED(.Lhandle_per) # load adr. of per handler 334 la %r14,BASED(sysc_return) # load adr. of system return 335 br %r1 # branch to do_single_step 336 337# 338# call trace before and after sys_call 339# 340sysc_tracesys: 341 l %r1,BASED(.Ltrace) 342 la %r2,SP_PTREGS(%r15) # load pt_regs 343 la %r3,0 344 srl %r7,2 345 st %r7,SP_R2(%r15) 346 basr %r14,%r1 347 clc SP_R2(4,%r15),BASED(.Lnr_syscalls) 348 bnl BASED(sysc_tracenogo) 349 l %r8,BASED(.Lsysc_table) 350 l %r7,SP_R2(%r15) # strace might have changed the 351 sll %r7,2 # system call 352 l %r8,0(%r7,%r8) 353sysc_tracego: 354 lm %r3,%r6,SP_R3(%r15) 355 l %r2,SP_ORIG_R2(%r15) 356 basr %r14,%r8 # call sys_xxx 357 st %r2,SP_R2(%r15) # store return value 358sysc_tracenogo: 359 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 360 bz BASED(sysc_return) 361 l %r1,BASED(.Ltrace) 362 la %r2,SP_PTREGS(%r15) # load pt_regs 363 la %r3,1 364 la %r14,BASED(sysc_return) 365 br %r1 366 367# 368# a new process exits the kernel with ret_from_fork 369# 370 .globl ret_from_fork 371ret_from_fork: 372 l %r13,__LC_SVC_NEW_PSW+4 373 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 374 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 375 bo BASED(0f) 376 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3770: l %r1,BASED(.Lschedtail) 378 basr %r14,%r1 379 TRACE_IRQS_ON 380 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 381 b BASED(sysc_return) 382 383# 384# clone, fork, vfork, exec and sigreturn need glue, 385# because they all expect pt_regs as parameter, 386# but are called with different parameter. 387# return-address is set up above 388# 389sys_clone_glue: 390 la %r2,SP_PTREGS(%r15) # load pt_regs 391 l %r1,BASED(.Lclone) 392 br %r1 # branch to sys_clone 393 394sys_fork_glue: 395 la %r2,SP_PTREGS(%r15) # load pt_regs 396 l %r1,BASED(.Lfork) 397 br %r1 # branch to sys_fork 398 399sys_vfork_glue: 400 la %r2,SP_PTREGS(%r15) # load pt_regs 401 l %r1,BASED(.Lvfork) 402 br %r1 # branch to sys_vfork 403 404sys_execve_glue: 405 la %r2,SP_PTREGS(%r15) # load pt_regs 406 l %r1,BASED(.Lexecve) 407 lr %r12,%r14 # save return address 408 basr %r14,%r1 # call sys_execve 409 ltr %r2,%r2 # check if execve failed 410 bnz 0(%r12) # it did fail -> store result in gpr2 411 b 4(%r12) # SKIP ST 2,SP_R2(15) after BASR 14,8 412 # in system_call/sysc_tracesys 413 414sys_sigreturn_glue: 415 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter 416 l %r1,BASED(.Lsigreturn) 417 br %r1 # branch to sys_sigreturn 418 419sys_rt_sigreturn_glue: 420 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter 421 l %r1,BASED(.Lrt_sigreturn) 422 br %r1 # branch to sys_sigreturn 423 424sys_sigaltstack_glue: 425 la %r4,SP_PTREGS(%r15) # load pt_regs as parameter 426 l %r1,BASED(.Lsigaltstack) 427 br %r1 # branch to sys_sigreturn 428 429 430/* 431 * Program check handler routine 432 */ 433 434 .globl pgm_check_handler 435pgm_check_handler: 436/* 437 * First we need to check for a special case: 438 * Single stepping an instruction that disables the PER event mask will 439 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 440 * For a single stepped SVC the program check handler gets control after 441 * the SVC new PSW has been loaded. But we want to execute the SVC first and 442 * then handle the PER event. Therefore we update the SVC old PSW to point 443 * to the pgm_check_handler and branch to the SVC handler after we checked 444 * if we have to load the kernel stack register. 445 * For every other possible cause for PER event without the PER mask set 446 * we just ignore the PER event (FIXME: is there anything we have to do 447 * for LPSW?). 448 */ 449 STORE_TIMER __LC_SYNC_ENTER_TIMER 450 SAVE_ALL_BASE __LC_SAVE_AREA 451 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 452 bnz BASED(pgm_per) # got per exception -> special case 453 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 454 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 455#ifdef CONFIG_VIRT_CPU_ACCOUNTING 456 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 457 bz BASED(pgm_no_vtime) 458 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 459 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 460 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 461pgm_no_vtime: 462#endif 463 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 464 l %r3,__LC_PGM_ILC # load program interruption code 465 la %r8,0x7f 466 nr %r8,%r3 467pgm_do_call: 468 l %r7,BASED(.Ljump_table) 469 sll %r8,2 470 l %r7,0(%r8,%r7) # load address of handler routine 471 la %r2,SP_PTREGS(%r15) # address of register-save area 472 la %r14,BASED(sysc_return) 473 br %r7 # branch to interrupt-handler 474 475# 476# handle per exception 477# 478pgm_per: 479 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 480 bnz BASED(pgm_per_std) # ok, normal per event from user space 481# ok its one of the special cases, now we need to find out which one 482 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 483 be BASED(pgm_svcper) 484# no interesting special case, ignore PER event 485 lm %r12,%r15,__LC_SAVE_AREA 486 lpsw 0x28 487 488# 489# Normal per exception 490# 491pgm_per_std: 492 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 493 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 494#ifdef CONFIG_VIRT_CPU_ACCOUNTING 495 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 496 bz BASED(pgm_no_vtime2) 497 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 498 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 499 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 500pgm_no_vtime2: 501#endif 502 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 503 l %r1,__TI_task(%r9) 504 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 505 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 506 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 507 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 508 tm SP_PSW+1(%r15),0x01 # kernel per event ? 509 bz BASED(kernel_per) 510 l %r3,__LC_PGM_ILC # load program interruption code 511 la %r8,0x7f 512 nr %r8,%r3 # clear per-event-bit and ilc 513 be BASED(sysc_return) # only per or per+check ? 514 b BASED(pgm_do_call) 515 516# 517# it was a single stepped SVC that is causing all the trouble 518# 519pgm_svcper: 520 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 521 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 522#ifdef CONFIG_VIRT_CPU_ACCOUNTING 523 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 524 bz BASED(pgm_no_vtime3) 525 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 526 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 527 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 528pgm_no_vtime3: 529#endif 530 lh %r7,0x8a # get svc number from lowcore 531 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 532 l %r1,__TI_task(%r9) 533 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 534 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 535 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 536 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 537 TRACE_IRQS_ON 538 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 539 b BASED(sysc_do_svc) 540 541# 542# per was called from kernel, must be kprobes 543# 544kernel_per: 545 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 546 la %r2,SP_PTREGS(%r15) # address of register-save area 547 l %r1,BASED(.Lhandle_per) # load adr. of per handler 548 la %r14,BASED(sysc_leave) # load adr. of system return 549 br %r1 # branch to do_single_step 550 551/* 552 * IO interrupt handler routine 553 */ 554 555 .globl io_int_handler 556io_int_handler: 557 STORE_TIMER __LC_ASYNC_ENTER_TIMER 558 stck __LC_INT_CLOCK 559 SAVE_ALL_BASE __LC_SAVE_AREA+16 560 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 561 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 562#ifdef CONFIG_VIRT_CPU_ACCOUNTING 563 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 564 bz BASED(io_no_vtime) 565 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 566 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 567 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 568io_no_vtime: 569#endif 570 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 571 TRACE_IRQS_OFF 572 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 573 la %r2,SP_PTREGS(%r15) # address of register-save area 574 basr %r14,%r1 # branch to standard irq handler 575 TRACE_IRQS_ON 576 577io_return: 578 tm SP_PSW+1(%r15),0x01 # returning to user ? 579#ifdef CONFIG_PREEMPT 580 bno BASED(io_preempt) # no -> check for preemptive scheduling 581#else 582 bno BASED(io_leave) # no-> skip resched & signal 583#endif 584 tm __TI_flags+3(%r9),_TIF_WORK_INT 585 bnz BASED(io_work) # there is work to do (signals etc.) 586io_leave: 587 RESTORE_ALL __LC_RETURN_PSW,0 588io_done: 589 590#ifdef CONFIG_PREEMPT 591io_preempt: 592 icm %r0,15,__TI_precount(%r9) 593 bnz BASED(io_leave) 594 l %r1,SP_R15(%r15) 595 s %r1,BASED(.Lc_spsize) 596 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 597 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 598 lr %r15,%r1 599io_resume_loop: 600 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 601 bno BASED(io_leave) 602 mvc __TI_precount(4,%r9),BASED(.Lc_pactive) 603 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 604 l %r1,BASED(.Lschedule) 605 basr %r14,%r1 # call schedule 606 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 607 xc __TI_precount(4,%r9),__TI_precount(%r9) 608 b BASED(io_resume_loop) 609#endif 610 611# 612# switch to kernel stack, then check the TIF bits 613# 614io_work: 615 l %r1,__LC_KERNEL_STACK 616 s %r1,BASED(.Lc_spsize) 617 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 618 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 619 lr %r15,%r1 620# 621# One of the work bits is on. Find out which one. 622# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED 623# and _TIF_MCCK_PENDING 624# 625io_work_loop: 626 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 627 bo BASED(io_mcck_pending) 628 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 629 bo BASED(io_reschedule) 630 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 631 bnz BASED(io_sigpending) 632 b BASED(io_leave) 633 634# 635# _TIF_MCCK_PENDING is set, call handler 636# 637io_mcck_pending: 638 l %r1,BASED(.Ls390_handle_mcck) 639 la %r14,BASED(io_work_loop) 640 br %r1 # TIF bit will be cleared by handler 641 642# 643# _TIF_NEED_RESCHED is set, call schedule 644# 645io_reschedule: 646 l %r1,BASED(.Lschedule) 647 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 648 basr %r14,%r1 # call scheduler 649 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 650 tm __TI_flags+3(%r9),_TIF_WORK_INT 651 bz BASED(io_leave) # there is no work to do 652 b BASED(io_work_loop) 653 654# 655# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 656# 657io_sigpending: 658 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 659 la %r2,SP_PTREGS(%r15) # load pt_regs 660 l %r1,BASED(.Ldo_signal) 661 basr %r14,%r1 # call do_signal 662 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 663 b BASED(io_work_loop) 664 665/* 666 * External interrupt handler routine 667 */ 668 669 .globl ext_int_handler 670ext_int_handler: 671 STORE_TIMER __LC_ASYNC_ENTER_TIMER 672 stck __LC_INT_CLOCK 673 SAVE_ALL_BASE __LC_SAVE_AREA+16 674 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 675 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 676#ifdef CONFIG_VIRT_CPU_ACCOUNTING 677 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 678 bz BASED(ext_no_vtime) 679 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 680 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 681 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 682ext_no_vtime: 683#endif 684 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 685 TRACE_IRQS_OFF 686 la %r2,SP_PTREGS(%r15) # address of register-save area 687 lh %r3,__LC_EXT_INT_CODE # get interruption code 688 l %r1,BASED(.Ldo_extint) 689 basr %r14,%r1 690 TRACE_IRQS_ON 691 b BASED(io_return) 692 693__critical_end: 694 695/* 696 * Machine check handler routines 697 */ 698 699 .globl mcck_int_handler 700mcck_int_handler: 701 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 702 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 703 SAVE_ALL_BASE __LC_SAVE_AREA+32 704 la %r12,__LC_MCK_OLD_PSW 705 tm __LC_MCCK_CODE,0x80 # system damage? 706 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 707#ifdef CONFIG_VIRT_CPU_ACCOUNTING 708 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 709 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 710 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 711 bo BASED(1f) 712 la %r14,__LC_SYNC_ENTER_TIMER 713 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 714 bl BASED(0f) 715 la %r14,__LC_ASYNC_ENTER_TIMER 7160: clc 0(8,%r14),__LC_EXIT_TIMER 717 bl BASED(0f) 718 la %r14,__LC_EXIT_TIMER 7190: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 720 bl BASED(0f) 721 la %r14,__LC_LAST_UPDATE_TIMER 7220: spt 0(%r14) 723 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7241: 725#endif 726 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 727 bno BASED(mcck_int_main) # no -> skip cleanup critical 728 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 729 bnz BASED(mcck_int_main) # from user -> load async stack 730 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 731 bhe BASED(mcck_int_main) 732 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 733 bl BASED(mcck_int_main) 734 l %r14,BASED(.Lcleanup_critical) 735 basr %r14,%r14 736mcck_int_main: 737 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 738 slr %r14,%r15 739 sra %r14,PAGE_SHIFT 740 be BASED(0f) 741 l %r15,__LC_PANIC_STACK # load panic stack 7420: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 743#ifdef CONFIG_VIRT_CPU_ACCOUNTING 744 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 745 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 746 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 747 bz BASED(mcck_no_vtime) 748 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 749 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 750 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 751mcck_no_vtime: 752#endif 753 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 754 la %r2,SP_PTREGS(%r15) # load pt_regs 755 l %r1,BASED(.Ls390_mcck) 756 basr %r14,%r1 # call machine check handler 757 tm SP_PSW+1(%r15),0x01 # returning to user ? 758 bno BASED(mcck_return) 759 l %r1,__LC_KERNEL_STACK # switch to kernel stack 760 s %r1,BASED(.Lc_spsize) 761 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 762 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 763 lr %r15,%r1 764 stosm __SF_EMPTY(%r15),0x04 # turn dat on 765 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 766 bno BASED(mcck_return) 767 TRACE_IRQS_OFF 768 l %r1,BASED(.Ls390_handle_mcck) 769 basr %r14,%r1 # call machine check handler 770 TRACE_IRQS_ON 771mcck_return: 772 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 773 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 774#ifdef CONFIG_VIRT_CPU_ACCOUNTING 775 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 776 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 777 bno BASED(0f) 778 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 779 stpt __LC_EXIT_TIMER 780 lpsw __LC_RETURN_MCCK_PSW # back to caller 7810: 782#endif 783 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 784 lpsw __LC_RETURN_MCCK_PSW # back to caller 785 786 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 787 788#ifdef CONFIG_SMP 789/* 790 * Restart interruption handler, kick starter for additional CPUs 791 */ 792 .globl restart_int_handler 793restart_int_handler: 794 l %r15,__LC_SAVE_AREA+60 # load ksp 795 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 796 lam %a0,%a15,__LC_AREGS_SAVE_AREA 797 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 798 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 799 basr %r14,0 800 l %r14,restart_addr-.(%r14) 801 br %r14 # branch to start_secondary 802restart_addr: 803 .long start_secondary 804#else 805/* 806 * If we do not run with SMP enabled, let the new CPU crash ... 807 */ 808 .globl restart_int_handler 809restart_int_handler: 810 basr %r1,0 811restart_base: 812 lpsw restart_crash-restart_base(%r1) 813 .align 8 814restart_crash: 815 .long 0x000a0000,0x00000000 816restart_go: 817#endif 818 819#ifdef CONFIG_CHECK_STACK 820/* 821 * The synchronous or the asynchronous stack overflowed. We are dead. 822 * No need to properly save the registers, we are going to panic anyway. 823 * Setup a pt_regs so that show_trace can provide a good call trace. 824 */ 825stack_overflow: 826 l %r15,__LC_PANIC_STACK # change to panic stack 827 sl %r15,BASED(.Lc_spsize) 828 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 829 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 830 la %r1,__LC_SAVE_AREA 831 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 832 be BASED(0f) 833 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 834 be BASED(0f) 835 la %r1,__LC_SAVE_AREA+16 8360: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 837 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 838 l %r1,BASED(1f) # branch to kernel_stack_overflow 839 la %r2,SP_PTREGS(%r15) # load pt_regs 840 br %r1 8411: .long kernel_stack_overflow 842#endif 843 844cleanup_table_system_call: 845 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 846cleanup_table_sysc_return: 847 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 848cleanup_table_sysc_leave: 849 .long sysc_leave + 0x80000000, sysc_work_loop + 0x80000000 850cleanup_table_sysc_work_loop: 851 .long sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000 852cleanup_table_io_return: 853 .long io_return + 0x80000000, io_leave + 0x80000000 854cleanup_table_io_leave: 855 .long io_leave + 0x80000000, io_done + 0x80000000 856cleanup_table_io_work_loop: 857 .long io_work_loop + 0x80000000, io_mcck_pending + 0x80000000 858 859cleanup_critical: 860 clc 4(4,%r12),BASED(cleanup_table_system_call) 861 bl BASED(0f) 862 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 863 bl BASED(cleanup_system_call) 8640: 865 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 866 bl BASED(0f) 867 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 868 bl BASED(cleanup_sysc_return) 8690: 870 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 871 bl BASED(0f) 872 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 873 bl BASED(cleanup_sysc_leave) 8740: 875 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 876 bl BASED(0f) 877 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 878 bl BASED(cleanup_sysc_return) 8790: 880 clc 4(4,%r12),BASED(cleanup_table_io_return) 881 bl BASED(0f) 882 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 883 bl BASED(cleanup_io_return) 8840: 885 clc 4(4,%r12),BASED(cleanup_table_io_leave) 886 bl BASED(0f) 887 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 888 bl BASED(cleanup_io_leave) 8890: 890 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 891 bl BASED(0f) 892 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 893 bl BASED(cleanup_io_return) 8940: 895 br %r14 896 897cleanup_system_call: 898 mvc __LC_RETURN_PSW(8),0(%r12) 899 c %r12,BASED(.Lmck_old_psw) 900 be BASED(0f) 901 la %r12,__LC_SAVE_AREA+16 902 b BASED(1f) 9030: la %r12,__LC_SAVE_AREA+32 9041: 905#ifdef CONFIG_VIRT_CPU_ACCOUNTING 906 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 907 bh BASED(0f) 908 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9090: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 910 bhe BASED(cleanup_vtime) 911#endif 912 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 913 bh BASED(0f) 914 mvc __LC_SAVE_AREA(16),0(%r12) 9150: st %r13,4(%r12) 916 st %r12,__LC_SAVE_AREA+48 # argh 917 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 918 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 919 l %r12,__LC_SAVE_AREA+48 # argh 920 st %r15,12(%r12) 921 lh %r7,0x8a 922#ifdef CONFIG_VIRT_CPU_ACCOUNTING 923cleanup_vtime: 924 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 925 bhe BASED(cleanup_stime) 926 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 927 bz BASED(cleanup_novtime) 928 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 929cleanup_stime: 930 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 931 bh BASED(cleanup_update) 932 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 933cleanup_update: 934 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 935cleanup_novtime: 936#endif 937 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 938 la %r12,__LC_RETURN_PSW 939 br %r14 940cleanup_system_call_insn: 941 .long sysc_saveall + 0x80000000 942#ifdef CONFIG_VIRT_CPU_ACCOUNTING 943 .long system_call + 0x80000000 944 .long sysc_vtime + 0x80000000 945 .long sysc_stime + 0x80000000 946 .long sysc_update + 0x80000000 947#endif 948 949cleanup_sysc_return: 950 mvc __LC_RETURN_PSW(4),0(%r12) 951 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 952 la %r12,__LC_RETURN_PSW 953 br %r14 954 955cleanup_sysc_leave: 956 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 957 be BASED(2f) 958#ifdef CONFIG_VIRT_CPU_ACCOUNTING 959 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 960 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 961 be BASED(2f) 962#endif 963 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 964 c %r12,BASED(.Lmck_old_psw) 965 bne BASED(0f) 966 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 967 b BASED(1f) 9680: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9691: lm %r0,%r11,SP_R0(%r15) 970 l %r15,SP_R15(%r15) 9712: la %r12,__LC_RETURN_PSW 972 br %r14 973cleanup_sysc_leave_insn: 974#ifdef CONFIG_VIRT_CPU_ACCOUNTING 975 .long sysc_leave + 14 + 0x80000000 976#endif 977 .long sysc_leave + 10 + 0x80000000 978 979cleanup_io_return: 980 mvc __LC_RETURN_PSW(4),0(%r12) 981 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 982 la %r12,__LC_RETURN_PSW 983 br %r14 984 985cleanup_io_leave: 986 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 987 be BASED(2f) 988#ifdef CONFIG_VIRT_CPU_ACCOUNTING 989 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 990 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 991 be BASED(2f) 992#endif 993 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 994 c %r12,BASED(.Lmck_old_psw) 995 bne BASED(0f) 996 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 997 b BASED(1f) 9980: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9991: lm %r0,%r11,SP_R0(%r15) 1000 l %r15,SP_R15(%r15) 10012: la %r12,__LC_RETURN_PSW 1002 br %r14 1003cleanup_io_leave_insn: 1004#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1005 .long io_leave + 18 + 0x80000000 1006#endif 1007 .long io_leave + 14 + 0x80000000 1008 1009/* 1010 * Integer constants 1011 */ 1012 .align 4 1013.Lc_spsize: .long SP_SIZE 1014.Lc_overhead: .long STACK_FRAME_OVERHEAD 1015.Lc_pactive: .long PREEMPT_ACTIVE 1016.Lnr_syscalls: .long NR_syscalls 1017.L0x018: .short 0x018 1018.L0x020: .short 0x020 1019.L0x028: .short 0x028 1020.L0x030: .short 0x030 1021.L0x038: .short 0x038 1022.Lc_1: .long 1 1023 1024/* 1025 * Symbol constants 1026 */ 1027.Ls390_mcck: .long s390_do_machine_check 1028.Ls390_handle_mcck: 1029 .long s390_handle_mcck 1030.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1031.Ldo_IRQ: .long do_IRQ 1032.Ldo_extint: .long do_extint 1033.Ldo_signal: .long do_signal 1034.Lhandle_per: .long do_single_step 1035.Ljump_table: .long pgm_check_table 1036.Lschedule: .long schedule 1037.Lclone: .long sys_clone 1038.Lexecve: .long sys_execve 1039.Lfork: .long sys_fork 1040.Lrt_sigreturn:.long sys_rt_sigreturn 1041.Lrt_sigsuspend: 1042 .long sys_rt_sigsuspend 1043.Lsigreturn: .long sys_sigreturn 1044.Lsigsuspend: .long sys_sigsuspend 1045.Lsigaltstack: .long sys_sigaltstack 1046.Ltrace: .long syscall_trace 1047.Lvfork: .long sys_vfork 1048.Lschedtail: .long schedule_tail 1049.Lsysc_table: .long sys_call_table 1050#ifdef CONFIG_TRACE_IRQFLAGS 1051.Ltrace_irq_on:.long trace_hardirqs_on 1052.Ltrace_irq_off: 1053 .long trace_hardirqs_off 1054#endif 1055.Lcritical_start: 1056 .long __critical_start + 0x80000000 1057.Lcritical_end: 1058 .long __critical_end + 0x80000000 1059.Lcleanup_critical: 1060 .long cleanup_critical 1061 1062 .section .rodata, "a" 1063#define SYSCALL(esa,esame,emu) .long esa 1064sys_call_table: 1065#include "syscalls.S" 1066#undef SYSCALL 1067