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_SVC psworg,savearea 111 la %r12,\psworg 112 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 113 .endm 114 115 .macro SAVE_ALL_SYNC psworg,savearea 116 la %r12,\psworg 117 tm \psworg+1,0x01 # test problem state bit 118 bz BASED(2f) # skip stack setup save 119 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 120#ifdef CONFIG_CHECK_STACK 121 b BASED(3f) 1222: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 123 bz BASED(stack_overflow) 1243: 125#endif 1262: 127 .endm 128 129 .macro SAVE_ALL_ASYNC psworg,savearea 130 la %r12,\psworg 131 tm \psworg+1,0x01 # test problem state bit 132 bnz BASED(1f) # from user -> load async stack 133 clc \psworg+4(4),BASED(.Lcritical_end) 134 bhe BASED(0f) 135 clc \psworg+4(4),BASED(.Lcritical_start) 136 bl BASED(0f) 137 l %r14,BASED(.Lcleanup_critical) 138 basr %r14,%r14 139 tm 1(%r12),0x01 # retest problem state after cleanup 140 bnz BASED(1f) 1410: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 142 slr %r14,%r15 143 sra %r14,STACK_SHIFT 144 be BASED(2f) 1451: l %r15,__LC_ASYNC_STACK 146#ifdef CONFIG_CHECK_STACK 147 b BASED(3f) 1482: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 149 bz BASED(stack_overflow) 1503: 151#endif 1522: 153 .endm 154 155 .macro CREATE_STACK_FRAME psworg,savearea 156 s %r15,BASED(.Lc_spsize) # make room for registers & psw 157 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 158 la %r12,\psworg 159 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 160 icm %r12,12,__LC_SVC_ILC 161 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 162 st %r12,SP_ILC(%r15) 163 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 164 la %r12,0 165 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 166 .endm 167 168 .macro RESTORE_ALL psworg,sync 169 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 170 .if !\sync 171 ni \psworg+1,0xfd # clear wait state bit 172 .endif 173 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 174 STORE_TIMER __LC_EXIT_TIMER 175 lpsw \psworg # back to caller 176 .endm 177 178/* 179 * Scheduler resume function, called by switch_to 180 * gpr2 = (task_struct *) prev 181 * gpr3 = (task_struct *) next 182 * Returns: 183 * gpr2 = prev 184 */ 185 .globl __switch_to 186__switch_to: 187 basr %r1,0 188__switch_to_base: 189 tm __THREAD_per(%r3),0xe8 # new process is using per ? 190 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 191 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 192 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 193 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 194 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 195__switch_to_noper: 196 l %r4,__THREAD_info(%r2) # get thread_info of prev 197 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 198 bz __switch_to_no_mcck-__switch_to_base(%r1) 199 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 200 l %r4,__THREAD_info(%r3) # get thread_info of next 201 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 202__switch_to_no_mcck: 203 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 204 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 205 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 206 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 207 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 208 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 209 l %r3,__THREAD_info(%r3) # load thread_info from task struct 210 st %r3,__LC_THREAD_INFO 211 ahi %r3,STACK_SIZE 212 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 213 br %r14 214 215__critical_start: 216/* 217 * SVC interrupt handler routine. System calls are synchronous events and 218 * are executed with interrupts enabled. 219 */ 220 221 .globl system_call 222system_call: 223 STORE_TIMER __LC_SYNC_ENTER_TIMER 224sysc_saveall: 225 SAVE_ALL_BASE __LC_SAVE_AREA 226 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 227 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 228 lh %r7,0x8a # get svc number from lowcore 229#ifdef CONFIG_VIRT_CPU_ACCOUNTING 230sysc_vtime: 231 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 232 bz BASED(sysc_do_svc) 233 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 234sysc_stime: 235 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 236sysc_update: 237 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 238#endif 239sysc_do_svc: 240 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 241 sla %r7,2 # *4 and test for svc 0 242 bnz BASED(sysc_nr_ok) # svc number > 0 243 # svc 0: system call number in %r1 244 cl %r1,BASED(.Lnr_syscalls) 245 bnl BASED(sysc_nr_ok) 246 lr %r7,%r1 # copy svc number to %r7 247 sla %r7,2 # *4 248sysc_nr_ok: 249 mvc SP_ARGS(4,%r15),SP_R7(%r15) 250sysc_do_restart: 251 l %r8,BASED(.Lsysc_table) 252 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 253 l %r8,0(%r7,%r8) # get system call addr. 254 bnz BASED(sysc_tracesys) 255 basr %r14,%r8 # call sys_xxxx 256 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 257 258sysc_return: 259 tm SP_PSW+1(%r15),0x01 # returning to user ? 260 bno BASED(sysc_leave) 261 tm __TI_flags+3(%r9),_TIF_WORK_SVC 262 bnz BASED(sysc_work) # there is work to do (signals etc.) 263sysc_leave: 264 RESTORE_ALL __LC_RETURN_PSW,1 265 266# 267# recheck if there is more work to do 268# 269sysc_work_loop: 270 tm __TI_flags+3(%r9),_TIF_WORK_SVC 271 bz BASED(sysc_leave) # there is no work to do 272# 273# One of the work bits is on. Find out which one. 274# 275sysc_work: 276 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 277 bo BASED(sysc_mcck_pending) 278 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 279 bo BASED(sysc_reschedule) 280 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 281 bnz BASED(sysc_sigpending) 282 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 283 bo BASED(sysc_restart) 284 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 285 bo BASED(sysc_singlestep) 286 b BASED(sysc_leave) 287 288# 289# _TIF_NEED_RESCHED is set, call schedule 290# 291sysc_reschedule: 292 l %r1,BASED(.Lschedule) 293 la %r14,BASED(sysc_work_loop) 294 br %r1 # call scheduler 295 296# 297# _TIF_MCCK_PENDING is set, call handler 298# 299sysc_mcck_pending: 300 l %r1,BASED(.Ls390_handle_mcck) 301 la %r14,BASED(sysc_work_loop) 302 br %r1 # TIF bit will be cleared by handler 303 304# 305# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 306# 307sysc_sigpending: 308 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 309 la %r2,SP_PTREGS(%r15) # load pt_regs 310 l %r1,BASED(.Ldo_signal) 311 basr %r14,%r1 # call do_signal 312 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 313 bo BASED(sysc_restart) 314 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 315 bo BASED(sysc_singlestep) 316 b BASED(sysc_work_loop) 317 318# 319# _TIF_RESTART_SVC is set, set up registers and restart svc 320# 321sysc_restart: 322 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 323 l %r7,SP_R2(%r15) # load new svc number 324 sla %r7,2 325 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 326 lm %r2,%r6,SP_R2(%r15) # load svc arguments 327 b BASED(sysc_do_restart) # restart svc 328 329# 330# _TIF_SINGLE_STEP is set, call do_single_step 331# 332sysc_singlestep: 333 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 334 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 335 la %r2,SP_PTREGS(%r15) # address of register-save area 336 l %r1,BASED(.Lhandle_per) # load adr. of per handler 337 la %r14,BASED(sysc_return) # load adr. of system return 338 br %r1 # branch to do_single_step 339 340# 341# call trace before and after sys_call 342# 343sysc_tracesys: 344 l %r1,BASED(.Ltrace) 345 la %r2,SP_PTREGS(%r15) # load pt_regs 346 la %r3,0 347 srl %r7,2 348 st %r7,SP_R2(%r15) 349 basr %r14,%r1 350 clc SP_R2(4,%r15),BASED(.Lnr_syscalls) 351 bnl BASED(sysc_tracenogo) 352 l %r8,BASED(.Lsysc_table) 353 l %r7,SP_R2(%r15) # strace might have changed the 354 sll %r7,2 # system call 355 l %r8,0(%r7,%r8) 356sysc_tracego: 357 lm %r3,%r6,SP_R3(%r15) 358 l %r2,SP_ORIG_R2(%r15) 359 basr %r14,%r8 # call sys_xxx 360 st %r2,SP_R2(%r15) # store return value 361sysc_tracenogo: 362 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 363 bz BASED(sysc_return) 364 l %r1,BASED(.Ltrace) 365 la %r2,SP_PTREGS(%r15) # load pt_regs 366 la %r3,1 367 la %r14,BASED(sysc_return) 368 br %r1 369 370# 371# a new process exits the kernel with ret_from_fork 372# 373 .globl ret_from_fork 374ret_from_fork: 375 l %r13,__LC_SVC_NEW_PSW+4 376 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 377 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 378 bo BASED(0f) 379 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3800: l %r1,BASED(.Lschedtail) 381 basr %r14,%r1 382 TRACE_IRQS_ON 383 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 384 b BASED(sysc_return) 385 386# 387# kernel_execve function needs to deal with pt_regs that is not 388# at the usual place 389# 390 .globl kernel_execve 391kernel_execve: 392 stm %r12,%r15,48(%r15) 393 lr %r14,%r15 394 l %r13,__LC_SVC_NEW_PSW+4 395 s %r15,BASED(.Lc_spsize) 396 st %r14,__SF_BACKCHAIN(%r15) 397 la %r12,SP_PTREGS(%r15) 398 xc 0(__PT_SIZE,%r12),0(%r12) 399 l %r1,BASED(.Ldo_execve) 400 lr %r5,%r12 401 basr %r14,%r1 402 ltr %r2,%r2 403 be BASED(0f) 404 a %r15,BASED(.Lc_spsize) 405 lm %r12,%r15,48(%r15) 406 br %r14 407 # execve succeeded. 4080: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 409 l %r15,__LC_KERNEL_STACK # load ksp 410 s %r15,BASED(.Lc_spsize) # make room for registers & psw 411 l %r9,__LC_THREAD_INFO 412 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 413 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 414 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 415 l %r1,BASED(.Lexecve_tail) 416 basr %r14,%r1 417 b BASED(sysc_return) 418 419/* 420 * Program check handler routine 421 */ 422 423 .globl pgm_check_handler 424pgm_check_handler: 425/* 426 * First we need to check for a special case: 427 * Single stepping an instruction that disables the PER event mask will 428 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 429 * For a single stepped SVC the program check handler gets control after 430 * the SVC new PSW has been loaded. But we want to execute the SVC first and 431 * then handle the PER event. Therefore we update the SVC old PSW to point 432 * to the pgm_check_handler and branch to the SVC handler after we checked 433 * if we have to load the kernel stack register. 434 * For every other possible cause for PER event without the PER mask set 435 * we just ignore the PER event (FIXME: is there anything we have to do 436 * for LPSW?). 437 */ 438 STORE_TIMER __LC_SYNC_ENTER_TIMER 439 SAVE_ALL_BASE __LC_SAVE_AREA 440 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 441 bnz BASED(pgm_per) # got per exception -> special case 442 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 443 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 444#ifdef CONFIG_VIRT_CPU_ACCOUNTING 445 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 446 bz BASED(pgm_no_vtime) 447 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 448 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 449 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 450pgm_no_vtime: 451#endif 452 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 453 l %r3,__LC_PGM_ILC # load program interruption code 454 la %r8,0x7f 455 nr %r8,%r3 456pgm_do_call: 457 l %r7,BASED(.Ljump_table) 458 sll %r8,2 459 l %r7,0(%r8,%r7) # load address of handler routine 460 la %r2,SP_PTREGS(%r15) # address of register-save area 461 la %r14,BASED(sysc_return) 462 br %r7 # branch to interrupt-handler 463 464# 465# handle per exception 466# 467pgm_per: 468 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 469 bnz BASED(pgm_per_std) # ok, normal per event from user space 470# ok its one of the special cases, now we need to find out which one 471 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 472 be BASED(pgm_svcper) 473# no interesting special case, ignore PER event 474 lm %r12,%r15,__LC_SAVE_AREA 475 lpsw 0x28 476 477# 478# Normal per exception 479# 480pgm_per_std: 481 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 482 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 483#ifdef CONFIG_VIRT_CPU_ACCOUNTING 484 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 485 bz BASED(pgm_no_vtime2) 486 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 487 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 488 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 489pgm_no_vtime2: 490#endif 491 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 492 l %r1,__TI_task(%r9) 493 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 494 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 495 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 496 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 497 tm SP_PSW+1(%r15),0x01 # kernel per event ? 498 bz BASED(kernel_per) 499 l %r3,__LC_PGM_ILC # load program interruption code 500 la %r8,0x7f 501 nr %r8,%r3 # clear per-event-bit and ilc 502 be BASED(sysc_return) # only per or per+check ? 503 b BASED(pgm_do_call) 504 505# 506# it was a single stepped SVC that is causing all the trouble 507# 508pgm_svcper: 509 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 510 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 511#ifdef CONFIG_VIRT_CPU_ACCOUNTING 512 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 513 bz BASED(pgm_no_vtime3) 514 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 515 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 516 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 517pgm_no_vtime3: 518#endif 519 lh %r7,0x8a # get svc number from lowcore 520 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 521 l %r1,__TI_task(%r9) 522 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 523 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 524 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 525 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 526 TRACE_IRQS_ON 527 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 528 b BASED(sysc_do_svc) 529 530# 531# per was called from kernel, must be kprobes 532# 533kernel_per: 534 mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check 535 la %r2,SP_PTREGS(%r15) # address of register-save area 536 l %r1,BASED(.Lhandle_per) # load adr. of per handler 537 la %r14,BASED(sysc_leave) # load adr. of system return 538 br %r1 # branch to do_single_step 539 540/* 541 * IO interrupt handler routine 542 */ 543 544 .globl io_int_handler 545io_int_handler: 546 STORE_TIMER __LC_ASYNC_ENTER_TIMER 547 stck __LC_INT_CLOCK 548 SAVE_ALL_BASE __LC_SAVE_AREA+16 549 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 550 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 551#ifdef CONFIG_VIRT_CPU_ACCOUNTING 552 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 553 bz BASED(io_no_vtime) 554 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 555 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 556 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 557io_no_vtime: 558#endif 559 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 560 TRACE_IRQS_OFF 561 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 562 la %r2,SP_PTREGS(%r15) # address of register-save area 563 basr %r14,%r1 # branch to standard irq handler 564 TRACE_IRQS_ON 565 566io_return: 567 tm SP_PSW+1(%r15),0x01 # returning to user ? 568#ifdef CONFIG_PREEMPT 569 bno BASED(io_preempt) # no -> check for preemptive scheduling 570#else 571 bno BASED(io_leave) # no-> skip resched & signal 572#endif 573 tm __TI_flags+3(%r9),_TIF_WORK_INT 574 bnz BASED(io_work) # there is work to do (signals etc.) 575io_leave: 576 RESTORE_ALL __LC_RETURN_PSW,0 577io_done: 578 579#ifdef CONFIG_PREEMPT 580io_preempt: 581 icm %r0,15,__TI_precount(%r9) 582 bnz BASED(io_leave) 583 l %r1,SP_R15(%r15) 584 s %r1,BASED(.Lc_spsize) 585 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 586 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 587 lr %r15,%r1 588io_resume_loop: 589 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 590 bno BASED(io_leave) 591 mvc __TI_precount(4,%r9),BASED(.Lc_pactive) 592 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 593 l %r1,BASED(.Lschedule) 594 basr %r14,%r1 # call schedule 595 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 596 xc __TI_precount(4,%r9),__TI_precount(%r9) 597 b BASED(io_resume_loop) 598#endif 599 600# 601# switch to kernel stack, then check the TIF bits 602# 603io_work: 604 l %r1,__LC_KERNEL_STACK 605 s %r1,BASED(.Lc_spsize) 606 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 607 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 608 lr %r15,%r1 609# 610# One of the work bits is on. Find out which one. 611# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED 612# and _TIF_MCCK_PENDING 613# 614io_work_loop: 615 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 616 bo BASED(io_mcck_pending) 617 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 618 bo BASED(io_reschedule) 619 tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) 620 bnz BASED(io_sigpending) 621 b BASED(io_leave) 622 623# 624# _TIF_MCCK_PENDING is set, call handler 625# 626io_mcck_pending: 627 l %r1,BASED(.Ls390_handle_mcck) 628 la %r14,BASED(io_work_loop) 629 br %r1 # TIF bit will be cleared by handler 630 631# 632# _TIF_NEED_RESCHED is set, call schedule 633# 634io_reschedule: 635 l %r1,BASED(.Lschedule) 636 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 637 basr %r14,%r1 # call scheduler 638 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 639 tm __TI_flags+3(%r9),_TIF_WORK_INT 640 bz BASED(io_leave) # there is no work to do 641 b BASED(io_work_loop) 642 643# 644# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal 645# 646io_sigpending: 647 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 648 la %r2,SP_PTREGS(%r15) # load pt_regs 649 l %r1,BASED(.Ldo_signal) 650 basr %r14,%r1 # call do_signal 651 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 652 b BASED(io_work_loop) 653 654/* 655 * External interrupt handler routine 656 */ 657 658 .globl ext_int_handler 659ext_int_handler: 660 STORE_TIMER __LC_ASYNC_ENTER_TIMER 661 stck __LC_INT_CLOCK 662 SAVE_ALL_BASE __LC_SAVE_AREA+16 663 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 664 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 665#ifdef CONFIG_VIRT_CPU_ACCOUNTING 666 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 667 bz BASED(ext_no_vtime) 668 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 669 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 670 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 671ext_no_vtime: 672#endif 673 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 674 TRACE_IRQS_OFF 675 la %r2,SP_PTREGS(%r15) # address of register-save area 676 lh %r3,__LC_EXT_INT_CODE # get interruption code 677 l %r1,BASED(.Ldo_extint) 678 basr %r14,%r1 679 TRACE_IRQS_ON 680 b BASED(io_return) 681 682__critical_end: 683 684/* 685 * Machine check handler routines 686 */ 687 688 .globl mcck_int_handler 689mcck_int_handler: 690 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 691 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 692 SAVE_ALL_BASE __LC_SAVE_AREA+32 693 la %r12,__LC_MCK_OLD_PSW 694 tm __LC_MCCK_CODE,0x80 # system damage? 695 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 696#ifdef CONFIG_VIRT_CPU_ACCOUNTING 697 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 698 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 699 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 700 bo BASED(1f) 701 la %r14,__LC_SYNC_ENTER_TIMER 702 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 703 bl BASED(0f) 704 la %r14,__LC_ASYNC_ENTER_TIMER 7050: clc 0(8,%r14),__LC_EXIT_TIMER 706 bl BASED(0f) 707 la %r14,__LC_EXIT_TIMER 7080: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 709 bl BASED(0f) 710 la %r14,__LC_LAST_UPDATE_TIMER 7110: spt 0(%r14) 712 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7131: 714#endif 715 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 716 bno BASED(mcck_int_main) # no -> skip cleanup critical 717 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 718 bnz BASED(mcck_int_main) # from user -> load async stack 719 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 720 bhe BASED(mcck_int_main) 721 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 722 bl BASED(mcck_int_main) 723 l %r14,BASED(.Lcleanup_critical) 724 basr %r14,%r14 725mcck_int_main: 726 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 727 slr %r14,%r15 728 sra %r14,PAGE_SHIFT 729 be BASED(0f) 730 l %r15,__LC_PANIC_STACK # load panic stack 7310: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 732#ifdef CONFIG_VIRT_CPU_ACCOUNTING 733 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 734 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 735 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 736 bz BASED(mcck_no_vtime) 737 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 738 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 739 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 740mcck_no_vtime: 741#endif 742 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 743 la %r2,SP_PTREGS(%r15) # load pt_regs 744 l %r1,BASED(.Ls390_mcck) 745 basr %r14,%r1 # call machine check handler 746 tm SP_PSW+1(%r15),0x01 # returning to user ? 747 bno BASED(mcck_return) 748 l %r1,__LC_KERNEL_STACK # switch to kernel stack 749 s %r1,BASED(.Lc_spsize) 750 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 751 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 752 lr %r15,%r1 753 stosm __SF_EMPTY(%r15),0x04 # turn dat on 754 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 755 bno BASED(mcck_return) 756 TRACE_IRQS_OFF 757 l %r1,BASED(.Ls390_handle_mcck) 758 basr %r14,%r1 # call machine check handler 759 TRACE_IRQS_ON 760mcck_return: 761 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 762 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 763#ifdef CONFIG_VIRT_CPU_ACCOUNTING 764 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 765 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 766 bno BASED(0f) 767 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 768 stpt __LC_EXIT_TIMER 769 lpsw __LC_RETURN_MCCK_PSW # back to caller 7700: 771#endif 772 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 773 lpsw __LC_RETURN_MCCK_PSW # back to caller 774 775 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 776 777/* 778 * Restart interruption handler, kick starter for additional CPUs 779 */ 780#ifdef CONFIG_SMP 781#ifndef CONFIG_HOTPLUG_CPU 782 .section .init.text,"ax" 783#endif 784 .globl restart_int_handler 785restart_int_handler: 786 l %r15,__LC_SAVE_AREA+60 # load ksp 787 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 788 lam %a0,%a15,__LC_AREGS_SAVE_AREA 789 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 790 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 791 basr %r14,0 792 l %r14,restart_addr-.(%r14) 793 br %r14 # branch to start_secondary 794restart_addr: 795 .long start_secondary 796#ifndef CONFIG_HOTPLUG_CPU 797 .previous 798#endif 799#else 800/* 801 * If we do not run with SMP enabled, let the new CPU crash ... 802 */ 803 .globl restart_int_handler 804restart_int_handler: 805 basr %r1,0 806restart_base: 807 lpsw restart_crash-restart_base(%r1) 808 .align 8 809restart_crash: 810 .long 0x000a0000,0x00000000 811restart_go: 812#endif 813 814#ifdef CONFIG_CHECK_STACK 815/* 816 * The synchronous or the asynchronous stack overflowed. We are dead. 817 * No need to properly save the registers, we are going to panic anyway. 818 * Setup a pt_regs so that show_trace can provide a good call trace. 819 */ 820stack_overflow: 821 l %r15,__LC_PANIC_STACK # change to panic stack 822 sl %r15,BASED(.Lc_spsize) 823 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 824 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 825 la %r1,__LC_SAVE_AREA 826 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 827 be BASED(0f) 828 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 829 be BASED(0f) 830 la %r1,__LC_SAVE_AREA+16 8310: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 832 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 833 l %r1,BASED(1f) # branch to kernel_stack_overflow 834 la %r2,SP_PTREGS(%r15) # load pt_regs 835 br %r1 8361: .long kernel_stack_overflow 837#endif 838 839cleanup_table_system_call: 840 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 841cleanup_table_sysc_return: 842 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 843cleanup_table_sysc_leave: 844 .long sysc_leave + 0x80000000, sysc_work_loop + 0x80000000 845cleanup_table_sysc_work_loop: 846 .long sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000 847cleanup_table_io_return: 848 .long io_return + 0x80000000, io_leave + 0x80000000 849cleanup_table_io_leave: 850 .long io_leave + 0x80000000, io_done + 0x80000000 851cleanup_table_io_work_loop: 852 .long io_work_loop + 0x80000000, io_mcck_pending + 0x80000000 853 854cleanup_critical: 855 clc 4(4,%r12),BASED(cleanup_table_system_call) 856 bl BASED(0f) 857 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 858 bl BASED(cleanup_system_call) 8590: 860 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 861 bl BASED(0f) 862 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 863 bl BASED(cleanup_sysc_return) 8640: 865 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 866 bl BASED(0f) 867 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 868 bl BASED(cleanup_sysc_leave) 8690: 870 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 871 bl BASED(0f) 872 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 873 bl BASED(cleanup_sysc_return) 8740: 875 clc 4(4,%r12),BASED(cleanup_table_io_return) 876 bl BASED(0f) 877 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 878 bl BASED(cleanup_io_return) 8790: 880 clc 4(4,%r12),BASED(cleanup_table_io_leave) 881 bl BASED(0f) 882 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 883 bl BASED(cleanup_io_leave) 8840: 885 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 886 bl BASED(0f) 887 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 888 bl BASED(cleanup_io_return) 8890: 890 br %r14 891 892cleanup_system_call: 893 mvc __LC_RETURN_PSW(8),0(%r12) 894 c %r12,BASED(.Lmck_old_psw) 895 be BASED(0f) 896 la %r12,__LC_SAVE_AREA+16 897 b BASED(1f) 8980: la %r12,__LC_SAVE_AREA+32 8991: 900#ifdef CONFIG_VIRT_CPU_ACCOUNTING 901 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 902 bh BASED(0f) 903 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9040: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 905 bhe BASED(cleanup_vtime) 906#endif 907 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 908 bh BASED(0f) 909 mvc __LC_SAVE_AREA(16),0(%r12) 9100: st %r13,4(%r12) 911 st %r12,__LC_SAVE_AREA+48 # argh 912 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 913 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 914 l %r12,__LC_SAVE_AREA+48 # argh 915 st %r15,12(%r12) 916 lh %r7,0x8a 917#ifdef CONFIG_VIRT_CPU_ACCOUNTING 918cleanup_vtime: 919 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 920 bhe BASED(cleanup_stime) 921 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 922 bz BASED(cleanup_novtime) 923 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 924cleanup_stime: 925 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 926 bh BASED(cleanup_update) 927 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 928cleanup_update: 929 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 930cleanup_novtime: 931#endif 932 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 933 la %r12,__LC_RETURN_PSW 934 br %r14 935cleanup_system_call_insn: 936 .long sysc_saveall + 0x80000000 937#ifdef CONFIG_VIRT_CPU_ACCOUNTING 938 .long system_call + 0x80000000 939 .long sysc_vtime + 0x80000000 940 .long sysc_stime + 0x80000000 941 .long sysc_update + 0x80000000 942#endif 943 944cleanup_sysc_return: 945 mvc __LC_RETURN_PSW(4),0(%r12) 946 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 947 la %r12,__LC_RETURN_PSW 948 br %r14 949 950cleanup_sysc_leave: 951 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 952 be BASED(2f) 953#ifdef CONFIG_VIRT_CPU_ACCOUNTING 954 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 955 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 956 be BASED(2f) 957#endif 958 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 959 c %r12,BASED(.Lmck_old_psw) 960 bne BASED(0f) 961 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 962 b BASED(1f) 9630: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9641: lm %r0,%r11,SP_R0(%r15) 965 l %r15,SP_R15(%r15) 9662: la %r12,__LC_RETURN_PSW 967 br %r14 968cleanup_sysc_leave_insn: 969#ifdef CONFIG_VIRT_CPU_ACCOUNTING 970 .long sysc_leave + 14 + 0x80000000 971#endif 972 .long sysc_leave + 10 + 0x80000000 973 974cleanup_io_return: 975 mvc __LC_RETURN_PSW(4),0(%r12) 976 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 977 la %r12,__LC_RETURN_PSW 978 br %r14 979 980cleanup_io_leave: 981 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 982 be BASED(2f) 983#ifdef CONFIG_VIRT_CPU_ACCOUNTING 984 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 985 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 986 be BASED(2f) 987#endif 988 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 989 c %r12,BASED(.Lmck_old_psw) 990 bne BASED(0f) 991 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 992 b BASED(1f) 9930: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 9941: lm %r0,%r11,SP_R0(%r15) 995 l %r15,SP_R15(%r15) 9962: la %r12,__LC_RETURN_PSW 997 br %r14 998cleanup_io_leave_insn: 999#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1000 .long io_leave + 18 + 0x80000000 1001#endif 1002 .long io_leave + 14 + 0x80000000 1003 1004/* 1005 * Integer constants 1006 */ 1007 .align 4 1008.Lc_spsize: .long SP_SIZE 1009.Lc_overhead: .long STACK_FRAME_OVERHEAD 1010.Lc_pactive: .long PREEMPT_ACTIVE 1011.Lnr_syscalls: .long NR_syscalls 1012.L0x018: .short 0x018 1013.L0x020: .short 0x020 1014.L0x028: .short 0x028 1015.L0x030: .short 0x030 1016.L0x038: .short 0x038 1017.Lc_1: .long 1 1018 1019/* 1020 * Symbol constants 1021 */ 1022.Ls390_mcck: .long s390_do_machine_check 1023.Ls390_handle_mcck: 1024 .long s390_handle_mcck 1025.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1026.Ldo_IRQ: .long do_IRQ 1027.Ldo_extint: .long do_extint 1028.Ldo_signal: .long do_signal 1029.Lhandle_per: .long do_single_step 1030.Ldo_execve: .long do_execve 1031.Lexecve_tail: .long execve_tail 1032.Ljump_table: .long pgm_check_table 1033.Lschedule: .long schedule 1034.Ltrace: .long syscall_trace 1035.Lschedtail: .long schedule_tail 1036.Lsysc_table: .long sys_call_table 1037#ifdef CONFIG_TRACE_IRQFLAGS 1038.Ltrace_irq_on: .long trace_hardirqs_on 1039.Ltrace_irq_off: 1040 .long trace_hardirqs_off 1041#endif 1042.Lcritical_start: 1043 .long __critical_start + 0x80000000 1044.Lcritical_end: 1045 .long __critical_end + 0x80000000 1046.Lcleanup_critical: 1047 .long cleanup_critical 1048 1049 .section .rodata, "a" 1050#define SYSCALL(esa,esame,emu) .long esa 1051sys_call_table: 1052#include "syscalls.S" 1053#undef SYSCALL 1054