1/* 2 * arch/s390/kernel/entry.S 3 * S390 low-level entry points. 4 * 5 * Copyright (C) IBM Corp. 1999,2006 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Hartmut Penner (hp@de.ibm.com), 8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 9 * Heiko Carstens <heiko.carstens@de.ibm.com> 10 */ 11 12#include <linux/sys.h> 13#include <linux/linkage.h> 14#include <linux/init.h> 15#include <asm/cache.h> 16#include <asm/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_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR 49SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 50 51_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 52 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) 53_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 54 _TIF_MCCK_PENDING) 55_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ 56 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) 57 58STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 59STACK_SIZE = 1 << STACK_SHIFT 60 61#define BASED(name) name-system_call(%r13) 62 63#ifdef CONFIG_TRACE_IRQFLAGS 64 .macro TRACE_IRQS_ON 65 basr %r2,%r0 66 l %r1,BASED(.Ltrace_irq_on_caller) 67 basr %r14,%r1 68 .endm 69 70 .macro TRACE_IRQS_OFF 71 basr %r2,%r0 72 l %r1,BASED(.Ltrace_irq_off_caller) 73 basr %r14,%r1 74 .endm 75 76 .macro TRACE_IRQS_CHECK 77 basr %r2,%r0 78 tm SP_PSW(%r15),0x03 # irqs enabled? 79 jz 0f 80 l %r1,BASED(.Ltrace_irq_on_caller) 81 basr %r14,%r1 82 j 1f 830: l %r1,BASED(.Ltrace_irq_off_caller) 84 basr %r14,%r1 851: 86 .endm 87#else 88#define TRACE_IRQS_ON 89#define TRACE_IRQS_OFF 90#define TRACE_IRQS_CHECK 91#endif 92 93#ifdef CONFIG_LOCKDEP 94 .macro LOCKDEP_SYS_EXIT 95 tm SP_PSW+1(%r15),0x01 # returning to user ? 96 jz 0f 97 l %r1,BASED(.Llockdep_sys_exit) 98 basr %r14,%r1 990: 100 .endm 101#else 102#define LOCKDEP_SYS_EXIT 103#endif 104 105/* 106 * Register usage in interrupt handlers: 107 * R9 - pointer to current task structure 108 * R13 - pointer to literal pool 109 * R14 - return register for function calls 110 * R15 - kernel stack pointer 111 */ 112 113 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 114 lm %r10,%r11,\lc_from 115 sl %r10,\lc_to 116 sl %r11,\lc_to+4 117 bc 3,BASED(0f) 118 sl %r10,BASED(.Lc_1) 1190: al %r10,\lc_sum 120 al %r11,\lc_sum+4 121 bc 12,BASED(1f) 122 al %r10,BASED(.Lc_1) 1231: stm %r10,%r11,\lc_sum 124 .endm 125 126 .macro SAVE_ALL_BASE savearea 127 stm %r12,%r15,\savearea 128 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 129 .endm 130 131 .macro SAVE_ALL_SVC psworg,savearea 132 la %r12,\psworg 133 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 134 .endm 135 136 .macro SAVE_ALL_SYNC psworg,savearea 137 la %r12,\psworg 138 tm \psworg+1,0x01 # test problem state bit 139 bz BASED(2f) # skip stack setup save 140 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 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 SAVE_ALL_ASYNC psworg,savearea 151 la %r12,\psworg 152 tm \psworg+1,0x01 # test problem state bit 153 bnz BASED(1f) # from user -> load async stack 154 clc \psworg+4(4),BASED(.Lcritical_end) 155 bhe BASED(0f) 156 clc \psworg+4(4),BASED(.Lcritical_start) 157 bl BASED(0f) 158 l %r14,BASED(.Lcleanup_critical) 159 basr %r14,%r14 160 tm 1(%r12),0x01 # retest problem state after cleanup 161 bnz BASED(1f) 1620: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 163 slr %r14,%r15 164 sra %r14,STACK_SHIFT 165 be BASED(2f) 1661: l %r15,__LC_ASYNC_STACK 167#ifdef CONFIG_CHECK_STACK 168 b BASED(3f) 1692: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 170 bz BASED(stack_overflow) 1713: 172#endif 1732: 174 .endm 175 176 .macro CREATE_STACK_FRAME psworg,savearea 177 s %r15,BASED(.Lc_spsize) # make room for registers & psw 178 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 179 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 180 icm %r12,3,__LC_SVC_ILC 181 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 182 st %r12,SP_SVCNR(%r15) 183 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 184 la %r12,0 185 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 186 .endm 187 188 .macro RESTORE_ALL psworg,sync 189 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 190 .if !\sync 191 ni \psworg+1,0xfd # clear wait state bit 192 .endif 193 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 194 stpt __LC_EXIT_TIMER 195 lpsw \psworg # back to caller 196 .endm 197 198/* 199 * Scheduler resume function, called by switch_to 200 * gpr2 = (task_struct *) prev 201 * gpr3 = (task_struct *) next 202 * Returns: 203 * gpr2 = prev 204 */ 205 .globl __switch_to 206__switch_to: 207 basr %r1,0 208__switch_to_base: 209 tm __THREAD_per(%r3),0xe8 # new process is using per ? 210 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 211 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 212 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 213 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 214 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 215__switch_to_noper: 216 l %r4,__THREAD_info(%r2) # get thread_info of prev 217 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 218 bz __switch_to_no_mcck-__switch_to_base(%r1) 219 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 220 l %r4,__THREAD_info(%r3) # get thread_info of next 221 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 222__switch_to_no_mcck: 223 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 224 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 225 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 226 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 227 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 228 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 229 l %r3,__THREAD_info(%r3) # load thread_info from task struct 230 st %r3,__LC_THREAD_INFO 231 ahi %r3,STACK_SIZE 232 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 233 br %r14 234 235__critical_start: 236/* 237 * SVC interrupt handler routine. System calls are synchronous events and 238 * are executed with interrupts enabled. 239 */ 240 241 .globl system_call 242system_call: 243 stpt __LC_SYNC_ENTER_TIMER 244sysc_saveall: 245 SAVE_ALL_BASE __LC_SAVE_AREA 246 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 247 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 248 lh %r7,0x8a # get svc number from lowcore 249sysc_vtime: 250 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 251sysc_stime: 252 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 253sysc_update: 254 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 255sysc_do_svc: 256 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 257 ltr %r7,%r7 # test for svc 0 258 bnz BASED(sysc_nr_ok) # svc number > 0 259 # svc 0: system call number in %r1 260 cl %r1,BASED(.Lnr_syscalls) 261 bnl BASED(sysc_nr_ok) 262 lr %r7,%r1 # copy svc number to %r7 263sysc_nr_ok: 264 mvc SP_ARGS(4,%r15),SP_R7(%r15) 265sysc_do_restart: 266 sth %r7,SP_SVCNR(%r15) 267 sll %r7,2 # svc number *4 268 l %r8,BASED(.Lsysc_table) 269 tm __TI_flags+2(%r9),_TIF_SYSCALL 270 l %r8,0(%r7,%r8) # get system call addr. 271 bnz BASED(sysc_tracesys) 272 basr %r14,%r8 # call sys_xxxx 273 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 274 275sysc_return: 276 tm __TI_flags+3(%r9),_TIF_WORK_SVC 277 bnz BASED(sysc_work) # there is work to do (signals etc.) 278sysc_restore: 279#ifdef CONFIG_TRACE_IRQFLAGS 280 la %r1,BASED(sysc_restore_trace_psw_addr) 281 l %r1,0(%r1) 282 lpsw 0(%r1) 283sysc_restore_trace: 284 TRACE_IRQS_CHECK 285 LOCKDEP_SYS_EXIT 286#endif 287sysc_leave: 288 RESTORE_ALL __LC_RETURN_PSW,1 289sysc_done: 290 291#ifdef CONFIG_TRACE_IRQFLAGS 292sysc_restore_trace_psw_addr: 293 .long sysc_restore_trace_psw 294 295 .section .data,"aw",@progbits 296 .align 8 297 .globl sysc_restore_trace_psw 298sysc_restore_trace_psw: 299 .long 0, sysc_restore_trace + 0x80000000 300 .previous 301#endif 302 303# 304# recheck if there is more work to do 305# 306sysc_work_loop: 307 tm __TI_flags+3(%r9),_TIF_WORK_SVC 308 bz BASED(sysc_restore) # there is no work to do 309# 310# One of the work bits is on. Find out which one. 311# 312sysc_work: 313 tm SP_PSW+1(%r15),0x01 # returning to user ? 314 bno BASED(sysc_restore) 315 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 316 bo BASED(sysc_mcck_pending) 317 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 318 bo BASED(sysc_reschedule) 319 tm __TI_flags+3(%r9),_TIF_SIGPENDING 320 bnz BASED(sysc_sigpending) 321 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 322 bnz BASED(sysc_notify_resume) 323 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 324 bo BASED(sysc_restart) 325 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 326 bo BASED(sysc_singlestep) 327 b BASED(sysc_restore) 328sysc_work_done: 329 330# 331# _TIF_NEED_RESCHED is set, call schedule 332# 333sysc_reschedule: 334 l %r1,BASED(.Lschedule) 335 la %r14,BASED(sysc_work_loop) 336 br %r1 # call scheduler 337 338# 339# _TIF_MCCK_PENDING is set, call handler 340# 341sysc_mcck_pending: 342 l %r1,BASED(.Ls390_handle_mcck) 343 la %r14,BASED(sysc_work_loop) 344 br %r1 # TIF bit will be cleared by handler 345 346# 347# _TIF_SIGPENDING is set, call do_signal 348# 349sysc_sigpending: 350 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 351 la %r2,SP_PTREGS(%r15) # load pt_regs 352 l %r1,BASED(.Ldo_signal) 353 basr %r14,%r1 # call do_signal 354 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 355 bo BASED(sysc_restart) 356 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 357 bo BASED(sysc_singlestep) 358 b BASED(sysc_work_loop) 359 360# 361# _TIF_NOTIFY_RESUME is set, call do_notify_resume 362# 363sysc_notify_resume: 364 la %r2,SP_PTREGS(%r15) # load pt_regs 365 l %r1,BASED(.Ldo_notify_resume) 366 la %r14,BASED(sysc_work_loop) 367 br %r1 # call do_notify_resume 368 369 370# 371# _TIF_RESTART_SVC is set, set up registers and restart svc 372# 373sysc_restart: 374 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 375 l %r7,SP_R2(%r15) # load new svc number 376 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 377 lm %r2,%r6,SP_R2(%r15) # load svc arguments 378 b BASED(sysc_do_restart) # restart svc 379 380# 381# _TIF_SINGLE_STEP is set, call do_single_step 382# 383sysc_singlestep: 384 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 385 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 386 mvi SP_SVCNR+1(%r15),0xff 387 la %r2,SP_PTREGS(%r15) # address of register-save area 388 l %r1,BASED(.Lhandle_per) # load adr. of per handler 389 la %r14,BASED(sysc_return) # load adr. of system return 390 br %r1 # branch to do_single_step 391 392# 393# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 394# and after the system call 395# 396sysc_tracesys: 397 l %r1,BASED(.Ltrace_entry) 398 la %r2,SP_PTREGS(%r15) # load pt_regs 399 la %r3,0 400 srl %r7,2 401 st %r7,SP_R2(%r15) 402 basr %r14,%r1 403 cl %r2,BASED(.Lnr_syscalls) 404 bnl BASED(sysc_tracenogo) 405 l %r8,BASED(.Lsysc_table) 406 lr %r7,%r2 407 sll %r7,2 # svc number *4 408 l %r8,0(%r7,%r8) 409sysc_tracego: 410 lm %r3,%r6,SP_R3(%r15) 411 l %r2,SP_ORIG_R2(%r15) 412 basr %r14,%r8 # call sys_xxx 413 st %r2,SP_R2(%r15) # store return value 414sysc_tracenogo: 415 tm __TI_flags+2(%r9),_TIF_SYSCALL 416 bz BASED(sysc_return) 417 l %r1,BASED(.Ltrace_exit) 418 la %r2,SP_PTREGS(%r15) # load pt_regs 419 la %r14,BASED(sysc_return) 420 br %r1 421 422# 423# a new process exits the kernel with ret_from_fork 424# 425 .globl ret_from_fork 426ret_from_fork: 427 l %r13,__LC_SVC_NEW_PSW+4 428 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 429 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 430 bo BASED(0f) 431 st %r15,SP_R15(%r15) # store stack pointer for new kthread 4320: l %r1,BASED(.Lschedtail) 433 basr %r14,%r1 434 TRACE_IRQS_ON 435 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 436 b BASED(sysc_tracenogo) 437 438# 439# kernel_execve function needs to deal with pt_regs that is not 440# at the usual place 441# 442 .globl kernel_execve 443kernel_execve: 444 stm %r12,%r15,48(%r15) 445 lr %r14,%r15 446 l %r13,__LC_SVC_NEW_PSW+4 447 s %r15,BASED(.Lc_spsize) 448 st %r14,__SF_BACKCHAIN(%r15) 449 la %r12,SP_PTREGS(%r15) 450 xc 0(__PT_SIZE,%r12),0(%r12) 451 l %r1,BASED(.Ldo_execve) 452 lr %r5,%r12 453 basr %r14,%r1 454 ltr %r2,%r2 455 be BASED(0f) 456 a %r15,BASED(.Lc_spsize) 457 lm %r12,%r15,48(%r15) 458 br %r14 459 # execve succeeded. 4600: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 461 l %r15,__LC_KERNEL_STACK # load ksp 462 s %r15,BASED(.Lc_spsize) # make room for registers & psw 463 l %r9,__LC_THREAD_INFO 464 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 465 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 466 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 467 l %r1,BASED(.Lexecve_tail) 468 basr %r14,%r1 469 b BASED(sysc_return) 470 471/* 472 * Program check handler routine 473 */ 474 475 .globl pgm_check_handler 476pgm_check_handler: 477/* 478 * First we need to check for a special case: 479 * Single stepping an instruction that disables the PER event mask will 480 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 481 * For a single stepped SVC the program check handler gets control after 482 * the SVC new PSW has been loaded. But we want to execute the SVC first and 483 * then handle the PER event. Therefore we update the SVC old PSW to point 484 * to the pgm_check_handler and branch to the SVC handler after we checked 485 * if we have to load the kernel stack register. 486 * For every other possible cause for PER event without the PER mask set 487 * we just ignore the PER event (FIXME: is there anything we have to do 488 * for LPSW?). 489 */ 490 stpt __LC_SYNC_ENTER_TIMER 491 SAVE_ALL_BASE __LC_SAVE_AREA 492 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 493 bnz BASED(pgm_per) # got per exception -> special case 494 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 495 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 496 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 497 bz BASED(pgm_no_vtime) 498 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 499 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 500 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 501pgm_no_vtime: 502 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 503 TRACE_IRQS_OFF 504 l %r3,__LC_PGM_ILC # load program interruption code 505 la %r8,0x7f 506 nr %r8,%r3 507pgm_do_call: 508 l %r7,BASED(.Ljump_table) 509 sll %r8,2 510 l %r7,0(%r8,%r7) # load address of handler routine 511 la %r2,SP_PTREGS(%r15) # address of register-save area 512 la %r14,BASED(sysc_return) 513 br %r7 # branch to interrupt-handler 514 515# 516# handle per exception 517# 518pgm_per: 519 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 520 bnz BASED(pgm_per_std) # ok, normal per event from user space 521# ok its one of the special cases, now we need to find out which one 522 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 523 be BASED(pgm_svcper) 524# no interesting special case, ignore PER event 525 lm %r12,%r15,__LC_SAVE_AREA 526 lpsw 0x28 527 528# 529# Normal per exception 530# 531pgm_per_std: 532 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 533 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 534 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 535 bz BASED(pgm_no_vtime2) 536 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_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_SYNC_ENTER_TIMER 539pgm_no_vtime2: 540 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 541 TRACE_IRQS_OFF 542 l %r1,__TI_task(%r9) 543 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 544 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 545 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 546 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 547 tm SP_PSW+1(%r15),0x01 # kernel per event ? 548 bz BASED(kernel_per) 549 l %r3,__LC_PGM_ILC # load program interruption code 550 la %r8,0x7f 551 nr %r8,%r3 # clear per-event-bit and ilc 552 be BASED(sysc_return) # only per or per+check ? 553 b BASED(pgm_do_call) 554 555# 556# it was a single stepped SVC that is causing all the trouble 557# 558pgm_svcper: 559 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 560 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 561 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 562 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 563 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 564 lh %r7,0x8a # get svc number from lowcore 565 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 566 TRACE_IRQS_OFF 567 l %r8,__TI_task(%r9) 568 mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID 569 mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS 570 mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID 571 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 572 TRACE_IRQS_ON 573 lm %r2,%r6,SP_R2(%r15) # load svc arguments 574 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 575 b BASED(sysc_do_svc) 576 577# 578# per was called from kernel, must be kprobes 579# 580kernel_per: 581 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 582 mvi SP_SVCNR+1(%r15),0xff 583 la %r2,SP_PTREGS(%r15) # address of register-save area 584 l %r1,BASED(.Lhandle_per) # load adr. of per handler 585 la %r14,BASED(sysc_restore)# load adr. of system return 586 br %r1 # branch to do_single_step 587 588/* 589 * IO interrupt handler routine 590 */ 591 592 .globl io_int_handler 593io_int_handler: 594 stck __LC_INT_CLOCK 595 stpt __LC_ASYNC_ENTER_TIMER 596 SAVE_ALL_BASE __LC_SAVE_AREA+16 597 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 598 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 599 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 600 bz BASED(io_no_vtime) 601 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 602 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 603 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 604io_no_vtime: 605 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 606 TRACE_IRQS_OFF 607 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 608 la %r2,SP_PTREGS(%r15) # address of register-save area 609 basr %r14,%r1 # branch to standard irq handler 610io_return: 611 tm __TI_flags+3(%r9),_TIF_WORK_INT 612 bnz BASED(io_work) # there is work to do (signals etc.) 613io_restore: 614#ifdef CONFIG_TRACE_IRQFLAGS 615 la %r1,BASED(io_restore_trace_psw_addr) 616 l %r1,0(%r1) 617 lpsw 0(%r1) 618io_restore_trace: 619 TRACE_IRQS_CHECK 620 LOCKDEP_SYS_EXIT 621#endif 622io_leave: 623 RESTORE_ALL __LC_RETURN_PSW,0 624io_done: 625 626#ifdef CONFIG_TRACE_IRQFLAGS 627io_restore_trace_psw_addr: 628 .long io_restore_trace_psw 629 630 .section .data,"aw",@progbits 631 .align 8 632 .globl io_restore_trace_psw 633io_restore_trace_psw: 634 .long 0, io_restore_trace + 0x80000000 635 .previous 636#endif 637 638# 639# switch to kernel stack, then check the TIF bits 640# 641io_work: 642 tm SP_PSW+1(%r15),0x01 # returning to user ? 643#ifndef CONFIG_PREEMPT 644 bno BASED(io_restore) # no-> skip resched & signal 645#else 646 bnz BASED(io_work_user) # no -> check for preemptive scheduling 647 # check for preemptive scheduling 648 icm %r0,15,__TI_precount(%r9) 649 bnz BASED(io_restore) # preemption disabled 650 l %r1,SP_R15(%r15) 651 s %r1,BASED(.Lc_spsize) 652 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 653 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 654 lr %r15,%r1 655io_resume_loop: 656 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 657 bno BASED(io_restore) 658 l %r1,BASED(.Lpreempt_schedule_irq) 659 la %r14,BASED(io_resume_loop) 660 br %r1 # call schedule 661#endif 662 663io_work_user: 664 l %r1,__LC_KERNEL_STACK 665 s %r1,BASED(.Lc_spsize) 666 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 667 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 668 lr %r15,%r1 669# 670# One of the work bits is on. Find out which one. 671# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED 672# and _TIF_MCCK_PENDING 673# 674io_work_loop: 675 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 676 bo BASED(io_mcck_pending) 677 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 678 bo BASED(io_reschedule) 679 tm __TI_flags+3(%r9),_TIF_SIGPENDING 680 bnz BASED(io_sigpending) 681 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 682 bnz BASED(io_notify_resume) 683 b BASED(io_restore) 684io_work_done: 685 686# 687# _TIF_MCCK_PENDING is set, call handler 688# 689io_mcck_pending: 690 l %r1,BASED(.Ls390_handle_mcck) 691 basr %r14,%r1 # TIF bit will be cleared by handler 692 b BASED(io_work_loop) 693 694# 695# _TIF_NEED_RESCHED is set, call schedule 696# 697io_reschedule: 698 TRACE_IRQS_ON 699 l %r1,BASED(.Lschedule) 700 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 701 basr %r14,%r1 # call scheduler 702 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 703 TRACE_IRQS_OFF 704 tm __TI_flags+3(%r9),_TIF_WORK_INT 705 bz BASED(io_restore) # there is no work to do 706 b BASED(io_work_loop) 707 708# 709# _TIF_SIGPENDING is set, call do_signal 710# 711io_sigpending: 712 TRACE_IRQS_ON 713 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 714 la %r2,SP_PTREGS(%r15) # load pt_regs 715 l %r1,BASED(.Ldo_signal) 716 basr %r14,%r1 # call do_signal 717 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 718 TRACE_IRQS_OFF 719 b BASED(io_work_loop) 720 721# 722# _TIF_SIGPENDING is set, call do_signal 723# 724io_notify_resume: 725 TRACE_IRQS_ON 726 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 727 la %r2,SP_PTREGS(%r15) # load pt_regs 728 l %r1,BASED(.Ldo_notify_resume) 729 basr %r14,%r1 # call do_signal 730 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 731 TRACE_IRQS_OFF 732 b BASED(io_work_loop) 733 734/* 735 * External interrupt handler routine 736 */ 737 738 .globl ext_int_handler 739ext_int_handler: 740 stck __LC_INT_CLOCK 741 stpt __LC_ASYNC_ENTER_TIMER 742 SAVE_ALL_BASE __LC_SAVE_AREA+16 743 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 744 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 745 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 746 bz BASED(ext_no_vtime) 747 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 748 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 749 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 750ext_no_vtime: 751 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 752 TRACE_IRQS_OFF 753 la %r2,SP_PTREGS(%r15) # address of register-save area 754 lh %r3,__LC_EXT_INT_CODE # get interruption code 755 l %r1,BASED(.Ldo_extint) 756 basr %r14,%r1 757 b BASED(io_return) 758 759__critical_end: 760 761/* 762 * Machine check handler routines 763 */ 764 765 .globl mcck_int_handler 766mcck_int_handler: 767 stck __LC_INT_CLOCK 768 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 769 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 770 SAVE_ALL_BASE __LC_SAVE_AREA+32 771 la %r12,__LC_MCK_OLD_PSW 772 tm __LC_MCCK_CODE,0x80 # system damage? 773 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 774 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 775 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 776 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 777 bo BASED(1f) 778 la %r14,__LC_SYNC_ENTER_TIMER 779 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 780 bl BASED(0f) 781 la %r14,__LC_ASYNC_ENTER_TIMER 7820: clc 0(8,%r14),__LC_EXIT_TIMER 783 bl BASED(0f) 784 la %r14,__LC_EXIT_TIMER 7850: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 786 bl BASED(0f) 787 la %r14,__LC_LAST_UPDATE_TIMER 7880: spt 0(%r14) 789 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7901: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 791 bno BASED(mcck_int_main) # no -> skip cleanup critical 792 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 793 bnz BASED(mcck_int_main) # from user -> load async stack 794 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 795 bhe BASED(mcck_int_main) 796 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 797 bl BASED(mcck_int_main) 798 l %r14,BASED(.Lcleanup_critical) 799 basr %r14,%r14 800mcck_int_main: 801 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 802 slr %r14,%r15 803 sra %r14,PAGE_SHIFT 804 be BASED(0f) 805 l %r15,__LC_PANIC_STACK # load panic stack 8060: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 807 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 808 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 809 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 810 bz BASED(mcck_no_vtime) 811 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 812 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 813 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 814mcck_no_vtime: 815 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 816 la %r2,SP_PTREGS(%r15) # load pt_regs 817 l %r1,BASED(.Ls390_mcck) 818 basr %r14,%r1 # call machine check handler 819 tm SP_PSW+1(%r15),0x01 # returning to user ? 820 bno BASED(mcck_return) 821 l %r1,__LC_KERNEL_STACK # switch to kernel stack 822 s %r1,BASED(.Lc_spsize) 823 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 824 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 825 lr %r15,%r1 826 stosm __SF_EMPTY(%r15),0x04 # turn dat on 827 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 828 bno BASED(mcck_return) 829 TRACE_IRQS_OFF 830 l %r1,BASED(.Ls390_handle_mcck) 831 basr %r14,%r1 # call machine check handler 832 TRACE_IRQS_ON 833mcck_return: 834 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 835 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 836 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 837 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 838 bno BASED(0f) 839 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 840 stpt __LC_EXIT_TIMER 841 lpsw __LC_RETURN_MCCK_PSW # back to caller 8420: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 843 lpsw __LC_RETURN_MCCK_PSW # back to caller 844 845 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 846 847/* 848 * Restart interruption handler, kick starter for additional CPUs 849 */ 850#ifdef CONFIG_SMP 851 __CPUINIT 852 .globl restart_int_handler 853restart_int_handler: 854 basr %r1,0 855restart_base: 856 spt restart_vtime-restart_base(%r1) 857 stck __LC_LAST_UPDATE_CLOCK 858 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 859 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 860 l %r15,__LC_SAVE_AREA+60 # load ksp 861 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 862 lam %a0,%a15,__LC_AREGS_SAVE_AREA 863 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 864 l %r1,__LC_THREAD_INFO 865 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 866 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 867 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 868 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 869 basr %r14,0 870 l %r14,restart_addr-.(%r14) 871 br %r14 # branch to start_secondary 872restart_addr: 873 .long start_secondary 874 .align 8 875restart_vtime: 876 .long 0x7fffffff,0xffffffff 877 .previous 878#else 879/* 880 * If we do not run with SMP enabled, let the new CPU crash ... 881 */ 882 .globl restart_int_handler 883restart_int_handler: 884 basr %r1,0 885restart_base: 886 lpsw restart_crash-restart_base(%r1) 887 .align 8 888restart_crash: 889 .long 0x000a0000,0x00000000 890restart_go: 891#endif 892 893#ifdef CONFIG_CHECK_STACK 894/* 895 * The synchronous or the asynchronous stack overflowed. We are dead. 896 * No need to properly save the registers, we are going to panic anyway. 897 * Setup a pt_regs so that show_trace can provide a good call trace. 898 */ 899stack_overflow: 900 l %r15,__LC_PANIC_STACK # change to panic stack 901 sl %r15,BASED(.Lc_spsize) 902 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 903 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 904 la %r1,__LC_SAVE_AREA 905 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 906 be BASED(0f) 907 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 908 be BASED(0f) 909 la %r1,__LC_SAVE_AREA+16 9100: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 911 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 912 l %r1,BASED(1f) # branch to kernel_stack_overflow 913 la %r2,SP_PTREGS(%r15) # load pt_regs 914 br %r1 9151: .long kernel_stack_overflow 916#endif 917 918cleanup_table_system_call: 919 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 920cleanup_table_sysc_return: 921 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 922cleanup_table_sysc_leave: 923 .long sysc_leave + 0x80000000, sysc_done + 0x80000000 924cleanup_table_sysc_work_loop: 925 .long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000 926cleanup_table_io_return: 927 .long io_return + 0x80000000, io_leave + 0x80000000 928cleanup_table_io_leave: 929 .long io_leave + 0x80000000, io_done + 0x80000000 930cleanup_table_io_work_loop: 931 .long io_work_loop + 0x80000000, io_work_done + 0x80000000 932 933cleanup_critical: 934 clc 4(4,%r12),BASED(cleanup_table_system_call) 935 bl BASED(0f) 936 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 937 bl BASED(cleanup_system_call) 9380: 939 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 940 bl BASED(0f) 941 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 942 bl BASED(cleanup_sysc_return) 9430: 944 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 945 bl BASED(0f) 946 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 947 bl BASED(cleanup_sysc_leave) 9480: 949 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 950 bl BASED(0f) 951 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 952 bl BASED(cleanup_sysc_return) 9530: 954 clc 4(4,%r12),BASED(cleanup_table_io_return) 955 bl BASED(0f) 956 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 957 bl BASED(cleanup_io_return) 9580: 959 clc 4(4,%r12),BASED(cleanup_table_io_leave) 960 bl BASED(0f) 961 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 962 bl BASED(cleanup_io_leave) 9630: 964 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 965 bl BASED(0f) 966 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 967 bl BASED(cleanup_io_return) 9680: 969 br %r14 970 971cleanup_system_call: 972 mvc __LC_RETURN_PSW(8),0(%r12) 973 c %r12,BASED(.Lmck_old_psw) 974 be BASED(0f) 975 la %r12,__LC_SAVE_AREA+16 976 b BASED(1f) 9770: la %r12,__LC_SAVE_AREA+32 9781: 979 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 980 bh BASED(0f) 981 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9820: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 983 bhe BASED(cleanup_vtime) 984 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 985 bh BASED(0f) 986 mvc __LC_SAVE_AREA(16),0(%r12) 9870: st %r13,4(%r12) 988 st %r12,__LC_SAVE_AREA+48 # argh 989 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 990 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 991 l %r12,__LC_SAVE_AREA+48 # argh 992 st %r15,12(%r12) 993 lh %r7,0x8a 994cleanup_vtime: 995 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 996 bhe BASED(cleanup_stime) 997 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 998cleanup_stime: 999 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 1000 bh BASED(cleanup_update) 1001 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 1002cleanup_update: 1003 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 1004 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 1005 la %r12,__LC_RETURN_PSW 1006 br %r14 1007cleanup_system_call_insn: 1008 .long sysc_saveall + 0x80000000 1009 .long system_call + 0x80000000 1010 .long sysc_vtime + 0x80000000 1011 .long sysc_stime + 0x80000000 1012 .long sysc_update + 0x80000000 1013 1014cleanup_sysc_return: 1015 mvc __LC_RETURN_PSW(4),0(%r12) 1016 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 1017 la %r12,__LC_RETURN_PSW 1018 br %r14 1019 1020cleanup_sysc_leave: 1021 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 1022 be BASED(2f) 1023 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1024 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 1025 be BASED(2f) 1026 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1027 c %r12,BASED(.Lmck_old_psw) 1028 bne BASED(0f) 1029 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1030 b BASED(1f) 10310: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10321: lm %r0,%r11,SP_R0(%r15) 1033 l %r15,SP_R15(%r15) 10342: la %r12,__LC_RETURN_PSW 1035 br %r14 1036cleanup_sysc_leave_insn: 1037 .long sysc_done - 4 + 0x80000000 1038 .long sysc_done - 8 + 0x80000000 1039 1040cleanup_io_return: 1041 mvc __LC_RETURN_PSW(4),0(%r12) 1042 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 1043 la %r12,__LC_RETURN_PSW 1044 br %r14 1045 1046cleanup_io_leave: 1047 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 1048 be BASED(2f) 1049 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1050 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 1051 be BASED(2f) 1052 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1053 c %r12,BASED(.Lmck_old_psw) 1054 bne BASED(0f) 1055 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1056 b BASED(1f) 10570: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10581: lm %r0,%r11,SP_R0(%r15) 1059 l %r15,SP_R15(%r15) 10602: la %r12,__LC_RETURN_PSW 1061 br %r14 1062cleanup_io_leave_insn: 1063 .long io_done - 4 + 0x80000000 1064 .long io_done - 8 + 0x80000000 1065 1066/* 1067 * Integer constants 1068 */ 1069 .align 4 1070.Lc_spsize: .long SP_SIZE 1071.Lc_overhead: .long STACK_FRAME_OVERHEAD 1072.Lnr_syscalls: .long NR_syscalls 1073.L0x018: .short 0x018 1074.L0x020: .short 0x020 1075.L0x028: .short 0x028 1076.L0x030: .short 0x030 1077.L0x038: .short 0x038 1078.Lc_1: .long 1 1079 1080/* 1081 * Symbol constants 1082 */ 1083.Ls390_mcck: .long s390_do_machine_check 1084.Ls390_handle_mcck: 1085 .long s390_handle_mcck 1086.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1087.Ldo_IRQ: .long do_IRQ 1088.Ldo_extint: .long do_extint 1089.Ldo_signal: .long do_signal 1090.Ldo_notify_resume: 1091 .long do_notify_resume 1092.Lhandle_per: .long do_single_step 1093.Ldo_execve: .long do_execve 1094.Lexecve_tail: .long execve_tail 1095.Ljump_table: .long pgm_check_table 1096.Lschedule: .long schedule 1097#ifdef CONFIG_PREEMPT 1098.Lpreempt_schedule_irq: 1099 .long preempt_schedule_irq 1100#endif 1101.Ltrace_entry: .long do_syscall_trace_enter 1102.Ltrace_exit: .long do_syscall_trace_exit 1103.Lschedtail: .long schedule_tail 1104.Lsysc_table: .long sys_call_table 1105#ifdef CONFIG_TRACE_IRQFLAGS 1106.Ltrace_irq_on_caller: 1107 .long trace_hardirqs_on_caller 1108.Ltrace_irq_off_caller: 1109 .long trace_hardirqs_off_caller 1110#endif 1111#ifdef CONFIG_LOCKDEP 1112.Llockdep_sys_exit: 1113 .long lockdep_sys_exit 1114#endif 1115.Lcritical_start: 1116 .long __critical_start + 0x80000000 1117.Lcritical_end: 1118 .long __critical_end + 0x80000000 1119.Lcleanup_critical: 1120 .long cleanup_critical 1121 1122 .section .rodata, "a" 1123#define SYSCALL(esa,esame,emu) .long esa 1124 .globl sys_call_table 1125sys_call_table: 1126#include "syscalls.S" 1127#undef SYSCALL 1128