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 253sysc_return: 254 tm SP_PSW+1(%r15),0x01 # returning to user ? 255 bno BASED(sysc_leave) 256 tm __TI_flags+3(%r9),_TIF_WORK_SVC 257 bnz BASED(sysc_work) # there is work to do (signals etc.) 258sysc_leave: 259 RESTORE_ALL __LC_RETURN_PSW,1 260 261# 262# recheck if there is more work to do 263# 264sysc_work_loop: 265 tm __TI_flags+3(%r9),_TIF_WORK_SVC 266 bz BASED(sysc_leave) # there is no work to do 267# 268# One of the work bits is on. Find out which one. 269# 270sysc_work: 271 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 272 bo BASED(sysc_mcck_pending) 273 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 274 bo BASED(sysc_reschedule) 275 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 276 bnz BASED(sysc_sigpending) 277 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 278 bo BASED(sysc_restart) 279 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 280 bo BASED(sysc_singlestep) 281 b BASED(sysc_leave) 282 283# 284# _TIF_NEED_RESCHED is set, call schedule 285# 286sysc_reschedule: 287 l %r1,BASED(.Lschedule) 288 la %r14,BASED(sysc_work_loop) 289 br %r1 # call scheduler 290 291# 292# _TIF_MCCK_PENDING is set, call handler 293# 294sysc_mcck_pending: 295 l %r1,BASED(.Ls390_handle_mcck) 296 la %r14,BASED(sysc_work_loop) 297 br %r1 # TIF bit will be cleared by handler 298 299# 300# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 301# 302sysc_sigpending: 303 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 304 la %r2,SP_PTREGS(%r15) # load pt_regs 305 l %r1,BASED(.Ldo_signal) 306 basr %r14,%r1 # call do_signal 307 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 308 bo BASED(sysc_restart) 309 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 310 bo BASED(sysc_singlestep) 311 b BASED(sysc_work_loop) 312 313# 314# _TIF_RESTART_SVC is set, set up registers and restart svc 315# 316sysc_restart: 317 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 318 l %r7,SP_R2(%r15) # load new svc number 319 sla %r7,2 320 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 321 lm %r2,%r6,SP_R2(%r15) # load svc arguments 322 b BASED(sysc_do_restart) # restart svc 323 324# 325# _TIF_SINGLE_STEP is set, call do_single_step 326# 327sysc_singlestep: 328 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 329 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 330 la %r2,SP_PTREGS(%r15) # address of register-save area 331 l %r1,BASED(.Lhandle_per) # load adr. of per handler 332 la %r14,BASED(sysc_return) # load adr. of system return 333 br %r1 # branch to do_single_step 334 335# 336# call trace before and after sys_call 337# 338sysc_tracesys: 339 l %r1,BASED(.Ltrace) 340 la %r2,SP_PTREGS(%r15) # load pt_regs 341 la %r3,0 342 srl %r7,2 343 st %r7,SP_R2(%r15) 344 basr %r14,%r1 345 clc SP_R2(4,%r15),BASED(.Lnr_syscalls) 346 bnl BASED(sysc_tracenogo) 347 l %r8,BASED(.Lsysc_table) 348 l %r7,SP_R2(%r15) # strace might have changed the 349 sll %r7,2 # system call 350 l %r8,0(%r7,%r8) 351sysc_tracego: 352 lm %r3,%r6,SP_R3(%r15) 353 l %r2,SP_ORIG_R2(%r15) 354 basr %r14,%r8 # call sys_xxx 355 st %r2,SP_R2(%r15) # store return value 356sysc_tracenogo: 357 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 358 bz BASED(sysc_return) 359 l %r1,BASED(.Ltrace) 360 la %r2,SP_PTREGS(%r15) # load pt_regs 361 la %r3,1 362 la %r14,BASED(sysc_return) 363 br %r1 364 365# 366# a new process exits the kernel with ret_from_fork 367# 368 .globl ret_from_fork 369ret_from_fork: 370 l %r13,__LC_SVC_NEW_PSW+4 371 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 372 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 373 bo BASED(0f) 374 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3750: l %r1,BASED(.Lschedtail) 376 basr %r14,%r1 377 TRACE_IRQS_ON 378 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 379 b BASED(sysc_return) 380 381# 382# kernel_execve function needs to deal with pt_regs that is not 383# at the usual place 384# 385 .globl kernel_execve 386kernel_execve: 387 stm %r12,%r15,48(%r15) 388 lr %r14,%r15 389 l %r13,__LC_SVC_NEW_PSW+4 390 s %r15,BASED(.Lc_spsize) 391 st %r14,__SF_BACKCHAIN(%r15) 392 la %r12,SP_PTREGS(%r15) 393 xc 0(__PT_SIZE,%r12),0(%r12) 394 l %r1,BASED(.Ldo_execve) 395 lr %r5,%r12 396 basr %r14,%r1 397 ltr %r2,%r2 398 be BASED(0f) 399 a %r15,BASED(.Lc_spsize) 400 lm %r12,%r15,48(%r15) 401 br %r14 402 # execve succeeded. 4030: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 404 l %r15,__LC_KERNEL_STACK # load ksp 405 s %r15,BASED(.Lc_spsize) # make room for registers & psw 406 l %r9,__LC_THREAD_INFO 407 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 408 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 409 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 410 l %r1,BASED(.Lexecve_tail) 411 basr %r14,%r1 412 b BASED(sysc_return) 413 414/* 415 * Program check handler routine 416 */ 417 418 .globl pgm_check_handler 419pgm_check_handler: 420 STORE_TIMER __LC_SYNC_ENTER_TIMER 421 SAVE_ALL_BASE __LC_SAVE_AREA 422 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 423 bnz BASED(pgm_per) # got per exception -> special case 424 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 425 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 426#ifdef CONFIG_VIRT_CPU_ACCOUNTING 427 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 428 bz BASED(pgm_no_vtime) 429 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 430 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 431 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 432pgm_no_vtime: 433#endif 434 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 435 l %r3,__LC_PGM_ILC # load program interruption code 436 la %r8,0x7f 437 nr %r8,%r3 438pgm_do_call: 439 l %r7,BASED(.Ljump_table) 440 sll %r8,2 441 l %r7,0(%r8,%r7) # load address of handler routine 442 la %r2,SP_PTREGS(%r15) # address of register-save area 443 la %r14,BASED(sysc_return) 444 br %r7 # branch to interrupt-handler 445 446# 447# handle per exception 448# 449pgm_per: 450 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 451 bnz BASED(pgm_per_std) # ok, normal per event from user space 452# ok its one of the special cases, now we need to find out which one 453 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 454 be BASED(pgm_svcper) 455# no interesting special case, ignore PER event 456 lm %r12,%r15,__LC_SAVE_AREA 457 lpsw 0x28 458 459# 460# Normal per exception 461# 462pgm_per_std: 463 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 464 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 465#ifdef CONFIG_VIRT_CPU_ACCOUNTING 466 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 467 bz BASED(pgm_no_vtime2) 468 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 469 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 470 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 471pgm_no_vtime2: 472#endif 473 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 474 l %r1,__TI_task(%r9) 475 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 476 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 477 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 478 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 479 tm SP_PSW+1(%r15),0x01 # kernel per event ? 480 bz BASED(kernel_per) 481 l %r3,__LC_PGM_ILC # load program interruption code 482 la %r8,0x7f 483 nr %r8,%r3 # clear per-event-bit and ilc 484 be BASED(sysc_return) # only per or per+check ? 485 b BASED(pgm_do_call) 486 487# 488# it was a single stepped SVC that is causing all the trouble 489# 490pgm_svcper: 491 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 492 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 493#ifdef CONFIG_VIRT_CPU_ACCOUNTING 494 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 495 bz BASED(pgm_no_vtime3) 496 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 497 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 498 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 499pgm_no_vtime3: 500#endif 501 lh %r7,0x8a # get svc number from lowcore 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 TRACE_IRQS_ON 509 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 510 b BASED(sysc_do_svc) 511 512# 513# per was called from kernel, must be kprobes 514# 515kernel_per: 516 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 517 la %r2,SP_PTREGS(%r15) # address of register-save area 518 l %r1,BASED(.Lhandle_per) # load adr. of per handler 519 la %r14,BASED(sysc_leave) # load adr. of system return 520 br %r1 # branch to do_single_step 521 522/* 523 * IO interrupt handler routine 524 */ 525 526 .globl io_int_handler 527io_int_handler: 528 STORE_TIMER __LC_ASYNC_ENTER_TIMER 529 stck __LC_INT_CLOCK 530 SAVE_ALL_BASE __LC_SAVE_AREA+16 531 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 532 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 533#ifdef CONFIG_VIRT_CPU_ACCOUNTING 534 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 535 bz BASED(io_no_vtime) 536 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 537 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 538 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 539io_no_vtime: 540#endif 541 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 542 TRACE_IRQS_OFF 543 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 544 la %r2,SP_PTREGS(%r15) # address of register-save area 545 basr %r14,%r1 # branch to standard irq handler 546 TRACE_IRQS_ON 547 548io_return: 549 tm SP_PSW+1(%r15),0x01 # returning to user ? 550#ifdef CONFIG_PREEMPT 551 bno BASED(io_preempt) # no -> check for preemptive scheduling 552#else 553 bno BASED(io_leave) # no-> skip resched & signal 554#endif 555 tm __TI_flags+3(%r9),_TIF_WORK_INT 556 bnz BASED(io_work) # there is work to do (signals etc.) 557io_leave: 558 RESTORE_ALL __LC_RETURN_PSW,0 559io_done: 560 561#ifdef CONFIG_PREEMPT 562io_preempt: 563 icm %r0,15,__TI_precount(%r9) 564 bnz BASED(io_leave) 565 l %r1,SP_R15(%r15) 566 s %r1,BASED(.Lc_spsize) 567 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 568 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 569 lr %r15,%r1 570io_resume_loop: 571 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 572 bno BASED(io_leave) 573 mvc __TI_precount(4,%r9),BASED(.Lc_pactive) 574 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 575 l %r1,BASED(.Lschedule) 576 basr %r14,%r1 # call schedule 577 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 578 xc __TI_precount(4,%r9),__TI_precount(%r9) 579 b BASED(io_resume_loop) 580#endif 581 582# 583# switch to kernel stack, then check the TIF bits 584# 585io_work: 586 l %r1,__LC_KERNEL_STACK 587 s %r1,BASED(.Lc_spsize) 588 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 589 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 590 lr %r15,%r1 591# 592# One of the work bits is on. Find out which one. 593# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED 594# and _TIF_MCCK_PENDING 595# 596io_work_loop: 597 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 598 bo BASED(io_mcck_pending) 599 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 600 bo BASED(io_reschedule) 601 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 602 bnz BASED(io_sigpending) 603 b BASED(io_leave) 604 605# 606# _TIF_MCCK_PENDING is set, call handler 607# 608io_mcck_pending: 609 l %r1,BASED(.Ls390_handle_mcck) 610 la %r14,BASED(io_work_loop) 611 br %r1 # TIF bit will be cleared by handler 612 613# 614# _TIF_NEED_RESCHED is set, call schedule 615# 616io_reschedule: 617 l %r1,BASED(.Lschedule) 618 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 619 basr %r14,%r1 # call scheduler 620 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 621 tm __TI_flags+3(%r9),_TIF_WORK_INT 622 bz BASED(io_leave) # there is no work to do 623 b BASED(io_work_loop) 624 625# 626# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 627# 628io_sigpending: 629 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 630 la %r2,SP_PTREGS(%r15) # load pt_regs 631 l %r1,BASED(.Ldo_signal) 632 basr %r14,%r1 # call do_signal 633 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 634 b BASED(io_work_loop) 635 636/* 637 * External interrupt handler routine 638 */ 639 640 .globl ext_int_handler 641ext_int_handler: 642 STORE_TIMER __LC_ASYNC_ENTER_TIMER 643 stck __LC_INT_CLOCK 644 SAVE_ALL_BASE __LC_SAVE_AREA+16 645 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 646 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 647#ifdef CONFIG_VIRT_CPU_ACCOUNTING 648 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 649 bz BASED(ext_no_vtime) 650 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 651 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 652 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 653ext_no_vtime: 654#endif 655 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 656 TRACE_IRQS_OFF 657 la %r2,SP_PTREGS(%r15) # address of register-save area 658 lh %r3,__LC_EXT_INT_CODE # get interruption code 659 l %r1,BASED(.Ldo_extint) 660 basr %r14,%r1 661 TRACE_IRQS_ON 662 b BASED(io_return) 663 664__critical_end: 665 666/* 667 * Machine check handler routines 668 */ 669 670 .globl mcck_int_handler 671mcck_int_handler: 672 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 673 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 674 SAVE_ALL_BASE __LC_SAVE_AREA+32 675 la %r12,__LC_MCK_OLD_PSW 676 tm __LC_MCCK_CODE,0x80 # system damage? 677 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 678#ifdef CONFIG_VIRT_CPU_ACCOUNTING 679 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 680 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 681 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 682 bo BASED(1f) 683 la %r14,__LC_SYNC_ENTER_TIMER 684 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 685 bl BASED(0f) 686 la %r14,__LC_ASYNC_ENTER_TIMER 6870: clc 0(8,%r14),__LC_EXIT_TIMER 688 bl BASED(0f) 689 la %r14,__LC_EXIT_TIMER 6900: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 691 bl BASED(0f) 692 la %r14,__LC_LAST_UPDATE_TIMER 6930: spt 0(%r14) 694 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 6951: 696#endif 697 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 698 bno BASED(mcck_int_main) # no -> skip cleanup critical 699 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 700 bnz BASED(mcck_int_main) # from user -> load async stack 701 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 702 bhe BASED(mcck_int_main) 703 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 704 bl BASED(mcck_int_main) 705 l %r14,BASED(.Lcleanup_critical) 706 basr %r14,%r14 707mcck_int_main: 708 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 709 slr %r14,%r15 710 sra %r14,PAGE_SHIFT 711 be BASED(0f) 712 l %r15,__LC_PANIC_STACK # load panic stack 7130: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 714#ifdef CONFIG_VIRT_CPU_ACCOUNTING 715 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 716 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 717 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 718 bz BASED(mcck_no_vtime) 719 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 720 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 721 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 722mcck_no_vtime: 723#endif 724 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 725 la %r2,SP_PTREGS(%r15) # load pt_regs 726 l %r1,BASED(.Ls390_mcck) 727 basr %r14,%r1 # call machine check handler 728 tm SP_PSW+1(%r15),0x01 # returning to user ? 729 bno BASED(mcck_return) 730 l %r1,__LC_KERNEL_STACK # switch to kernel stack 731 s %r1,BASED(.Lc_spsize) 732 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 733 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 734 lr %r15,%r1 735 stosm __SF_EMPTY(%r15),0x04 # turn dat on 736 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 737 bno BASED(mcck_return) 738 TRACE_IRQS_OFF 739 l %r1,BASED(.Ls390_handle_mcck) 740 basr %r14,%r1 # call machine check handler 741 TRACE_IRQS_ON 742mcck_return: 743 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 744 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 745#ifdef CONFIG_VIRT_CPU_ACCOUNTING 746 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 747 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 748 bno BASED(0f) 749 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 750 stpt __LC_EXIT_TIMER 751 lpsw __LC_RETURN_MCCK_PSW # back to caller 7520: 753#endif 754 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 755 lpsw __LC_RETURN_MCCK_PSW # back to caller 756 757 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 758 759/* 760 * Restart interruption handler, kick starter for additional CPUs 761 */ 762#ifdef CONFIG_SMP 763#ifndef CONFIG_HOTPLUG_CPU 764 .section .init.text,"ax" 765#endif 766 .globl restart_int_handler 767restart_int_handler: 768 l %r15,__LC_SAVE_AREA+60 # load ksp 769 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 770 lam %a0,%a15,__LC_AREGS_SAVE_AREA 771 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 772 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 773 basr %r14,0 774 l %r14,restart_addr-.(%r14) 775 br %r14 # branch to start_secondary 776restart_addr: 777 .long start_secondary 778#ifndef CONFIG_HOTPLUG_CPU 779 .previous 780#endif 781#else 782/* 783 * If we do not run with SMP enabled, let the new CPU crash ... 784 */ 785 .globl restart_int_handler 786restart_int_handler: 787 basr %r1,0 788restart_base: 789 lpsw restart_crash-restart_base(%r1) 790 .align 8 791restart_crash: 792 .long 0x000a0000,0x00000000 793restart_go: 794#endif 795 796#ifdef CONFIG_CHECK_STACK 797/* 798 * The synchronous or the asynchronous stack overflowed. We are dead. 799 * No need to properly save the registers, we are going to panic anyway. 800 * Setup a pt_regs so that show_trace can provide a good call trace. 801 */ 802stack_overflow: 803 l %r15,__LC_PANIC_STACK # change to panic stack 804 sl %r15,BASED(.Lc_spsize) 805 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 806 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 807 la %r1,__LC_SAVE_AREA 808 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 809 be BASED(0f) 810 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 811 be BASED(0f) 812 la %r1,__LC_SAVE_AREA+16 8130: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 814 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 815 l %r1,BASED(1f) # branch to kernel_stack_overflow 816 la %r2,SP_PTREGS(%r15) # load pt_regs 817 br %r1 8181: .long kernel_stack_overflow 819#endif 820 821cleanup_table_system_call: 822 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 823cleanup_table_sysc_return: 824 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 825cleanup_table_sysc_leave: 826 .long sysc_leave + 0x80000000, sysc_work_loop + 0x80000000 827cleanup_table_sysc_work_loop: 828 .long sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000 829cleanup_table_io_return: 830 .long io_return + 0x80000000, io_leave + 0x80000000 831cleanup_table_io_leave: 832 .long io_leave + 0x80000000, io_done + 0x80000000 833cleanup_table_io_work_loop: 834 .long io_work_loop + 0x80000000, io_mcck_pending + 0x80000000 835 836cleanup_critical: 837 clc 4(4,%r12),BASED(cleanup_table_system_call) 838 bl BASED(0f) 839 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 840 bl BASED(cleanup_system_call) 8410: 842 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 843 bl BASED(0f) 844 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 845 bl BASED(cleanup_sysc_return) 8460: 847 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 848 bl BASED(0f) 849 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 850 bl BASED(cleanup_sysc_leave) 8510: 852 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 853 bl BASED(0f) 854 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 855 bl BASED(cleanup_sysc_return) 8560: 857 clc 4(4,%r12),BASED(cleanup_table_io_return) 858 bl BASED(0f) 859 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 860 bl BASED(cleanup_io_return) 8610: 862 clc 4(4,%r12),BASED(cleanup_table_io_leave) 863 bl BASED(0f) 864 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 865 bl BASED(cleanup_io_leave) 8660: 867 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 868 bl BASED(0f) 869 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 870 bl BASED(cleanup_io_return) 8710: 872 br %r14 873 874cleanup_system_call: 875 mvc __LC_RETURN_PSW(8),0(%r12) 876 c %r12,BASED(.Lmck_old_psw) 877 be BASED(0f) 878 la %r12,__LC_SAVE_AREA+16 879 b BASED(1f) 8800: la %r12,__LC_SAVE_AREA+32 8811: 882#ifdef CONFIG_VIRT_CPU_ACCOUNTING 883 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 884 bh BASED(0f) 885 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 8860: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 887 bhe BASED(cleanup_vtime) 888#endif 889 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 890 bh BASED(0f) 891 mvc __LC_SAVE_AREA(16),0(%r12) 8920: st %r13,4(%r12) 893 st %r12,__LC_SAVE_AREA+48 # argh 894 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 895 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 896 l %r12,__LC_SAVE_AREA+48 # argh 897 st %r15,12(%r12) 898 lh %r7,0x8a 899#ifdef CONFIG_VIRT_CPU_ACCOUNTING 900cleanup_vtime: 901 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 902 bhe BASED(cleanup_stime) 903 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 904 bz BASED(cleanup_novtime) 905 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 906cleanup_stime: 907 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 908 bh BASED(cleanup_update) 909 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 910cleanup_update: 911 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 912cleanup_novtime: 913#endif 914 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 915 la %r12,__LC_RETURN_PSW 916 br %r14 917cleanup_system_call_insn: 918 .long sysc_saveall + 0x80000000 919#ifdef CONFIG_VIRT_CPU_ACCOUNTING 920 .long system_call + 0x80000000 921 .long sysc_vtime + 0x80000000 922 .long sysc_stime + 0x80000000 923 .long sysc_update + 0x80000000 924#endif 925 926cleanup_sysc_return: 927 mvc __LC_RETURN_PSW(4),0(%r12) 928 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 929 la %r12,__LC_RETURN_PSW 930 br %r14 931 932cleanup_sysc_leave: 933 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 934 be BASED(2f) 935#ifdef CONFIG_VIRT_CPU_ACCOUNTING 936 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 937 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 938 be BASED(2f) 939#endif 940 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 941 c %r12,BASED(.Lmck_old_psw) 942 bne BASED(0f) 943 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 944 b BASED(1f) 9450: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9461: lm %r0,%r11,SP_R0(%r15) 947 l %r15,SP_R15(%r15) 9482: la %r12,__LC_RETURN_PSW 949 br %r14 950cleanup_sysc_leave_insn: 951#ifdef CONFIG_VIRT_CPU_ACCOUNTING 952 .long sysc_leave + 14 + 0x80000000 953#endif 954 .long sysc_leave + 10 + 0x80000000 955 956cleanup_io_return: 957 mvc __LC_RETURN_PSW(4),0(%r12) 958 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 959 la %r12,__LC_RETURN_PSW 960 br %r14 961 962cleanup_io_leave: 963 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 964 be BASED(2f) 965#ifdef CONFIG_VIRT_CPU_ACCOUNTING 966 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 967 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 968 be BASED(2f) 969#endif 970 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 971 c %r12,BASED(.Lmck_old_psw) 972 bne BASED(0f) 973 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 974 b BASED(1f) 9750: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9761: lm %r0,%r11,SP_R0(%r15) 977 l %r15,SP_R15(%r15) 9782: la %r12,__LC_RETURN_PSW 979 br %r14 980cleanup_io_leave_insn: 981#ifdef CONFIG_VIRT_CPU_ACCOUNTING 982 .long io_leave + 18 + 0x80000000 983#endif 984 .long io_leave + 14 + 0x80000000 985 986/* 987 * Integer constants 988 */ 989 .align 4 990.Lc_spsize: .long SP_SIZE 991.Lc_overhead: .long STACK_FRAME_OVERHEAD 992.Lc_pactive: .long PREEMPT_ACTIVE 993.Lnr_syscalls: .long NR_syscalls 994.L0x018: .short 0x018 995.L0x020: .short 0x020 996.L0x028: .short 0x028 997.L0x030: .short 0x030 998.L0x038: .short 0x038 999.Lc_1: .long 1 1000 1001/* 1002 * Symbol constants 1003 */ 1004.Ls390_mcck: .long s390_do_machine_check 1005.Ls390_handle_mcck: 1006 .long s390_handle_mcck 1007.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1008.Ldo_IRQ: .long do_IRQ 1009.Ldo_extint: .long do_extint 1010.Ldo_signal: .long do_signal 1011.Lhandle_per: .long do_single_step 1012.Ldo_execve: .long do_execve 1013.Lexecve_tail: .long execve_tail 1014.Ljump_table: .long pgm_check_table 1015.Lschedule: .long schedule 1016.Ltrace: .long syscall_trace 1017.Lschedtail: .long schedule_tail 1018.Lsysc_table: .long sys_call_table 1019#ifdef CONFIG_TRACE_IRQFLAGS 1020.Ltrace_irq_on: .long trace_hardirqs_on 1021.Ltrace_irq_off: 1022 .long trace_hardirqs_off 1023#endif 1024.Lcritical_start: 1025 .long __critical_start + 0x80000000 1026.Lcritical_end: 1027 .long __critical_end + 0x80000000 1028.Lcleanup_critical: 1029 .long cleanup_critical 1030 1031 .section .rodata, "a" 1032#define SYSCALL(esa,esame,emu) .long esa 1033sys_call_table: 1034#include "syscalls.S" 1035#undef SYSCALL 1036