1/* 2 * arch/s390/kernel/entry.S 3 * S390 low-level entry points. 4 * 5 * Copyright (C) IBM Corp. 1999,2006 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Hartmut Penner (hp@de.ibm.com), 8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 9 * Heiko Carstens <heiko.carstens@de.ibm.com> 10 */ 11 12#include <linux/sys.h> 13#include <linux/linkage.h> 14#include <linux/init.h> 15#include <asm/cache.h> 16#include <asm/lowcore.h> 17#include <asm/errno.h> 18#include <asm/ptrace.h> 19#include <asm/thread_info.h> 20#include <asm/asm-offsets.h> 21#include <asm/unistd.h> 22#include <asm/page.h> 23 24/* 25 * Stack layout for the system_call stack entry. 26 * The first few entries are identical to the user_regs_struct. 27 */ 28SP_PTREGS = STACK_FRAME_OVERHEAD 29SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 30SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 31SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 32SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 33SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 34SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 35SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 36SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 37SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 38SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 39SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 40SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 41SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 42SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 43SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 44SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 45SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 46SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 47SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 48SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC 49SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR 50SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 51 52_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 53 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) 54_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 55 _TIF_MCCK_PENDING) 56 57STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 58STACK_SIZE = 1 << STACK_SHIFT 59 60#define BASED(name) name-system_call(%r13) 61 62#ifdef CONFIG_TRACE_IRQFLAGS 63 .macro TRACE_IRQS_ON 64 basr %r2,%r0 65 l %r1,BASED(.Ltrace_irq_on_caller) 66 basr %r14,%r1 67 .endm 68 69 .macro TRACE_IRQS_OFF 70 basr %r2,%r0 71 l %r1,BASED(.Ltrace_irq_off_caller) 72 basr %r14,%r1 73 .endm 74 75 .macro TRACE_IRQS_CHECK 76 basr %r2,%r0 77 tm SP_PSW(%r15),0x03 # irqs enabled? 78 jz 0f 79 l %r1,BASED(.Ltrace_irq_on_caller) 80 basr %r14,%r1 81 j 1f 820: l %r1,BASED(.Ltrace_irq_off_caller) 83 basr %r14,%r1 841: 85 .endm 86#else 87#define TRACE_IRQS_ON 88#define TRACE_IRQS_OFF 89#define TRACE_IRQS_CHECK 90#endif 91 92#ifdef CONFIG_LOCKDEP 93 .macro LOCKDEP_SYS_EXIT 94 tm SP_PSW+1(%r15),0x01 # returning to user ? 95 jz 0f 96 l %r1,BASED(.Llockdep_sys_exit) 97 basr %r14,%r1 980: 99 .endm 100#else 101#define LOCKDEP_SYS_EXIT 102#endif 103 104/* 105 * Register usage in interrupt handlers: 106 * R9 - pointer to current task structure 107 * R13 - pointer to literal pool 108 * R14 - return register for function calls 109 * R15 - kernel stack pointer 110 */ 111 112 .macro STORE_TIMER lc_offset 113#ifdef CONFIG_VIRT_CPU_ACCOUNTING 114 stpt \lc_offset 115#endif 116 .endm 117 118#ifdef CONFIG_VIRT_CPU_ACCOUNTING 119 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 120 lm %r10,%r11,\lc_from 121 sl %r10,\lc_to 122 sl %r11,\lc_to+4 123 bc 3,BASED(0f) 124 sl %r10,BASED(.Lc_1) 1250: al %r10,\lc_sum 126 al %r11,\lc_sum+4 127 bc 12,BASED(1f) 128 al %r10,BASED(.Lc_1) 1291: stm %r10,%r11,\lc_sum 130 .endm 131#endif 132 133 .macro SAVE_ALL_BASE savearea 134 stm %r12,%r15,\savearea 135 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 136 .endm 137 138 .macro SAVE_ALL_SVC psworg,savearea 139 la %r12,\psworg 140 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 141 .endm 142 143 .macro SAVE_ALL_SYNC psworg,savearea 144 la %r12,\psworg 145 tm \psworg+1,0x01 # test problem state bit 146 bz BASED(2f) # skip stack setup save 147 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 148#ifdef CONFIG_CHECK_STACK 149 b BASED(3f) 1502: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 151 bz BASED(stack_overflow) 1523: 153#endif 1542: 155 .endm 156 157 .macro SAVE_ALL_ASYNC psworg,savearea 158 la %r12,\psworg 159 tm \psworg+1,0x01 # test problem state bit 160 bnz BASED(1f) # from user -> load async stack 161 clc \psworg+4(4),BASED(.Lcritical_end) 162 bhe BASED(0f) 163 clc \psworg+4(4),BASED(.Lcritical_start) 164 bl BASED(0f) 165 l %r14,BASED(.Lcleanup_critical) 166 basr %r14,%r14 167 tm 1(%r12),0x01 # retest problem state after cleanup 168 bnz BASED(1f) 1690: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 170 slr %r14,%r15 171 sra %r14,STACK_SHIFT 172 be BASED(2f) 1731: l %r15,__LC_ASYNC_STACK 174#ifdef CONFIG_CHECK_STACK 175 b BASED(3f) 1762: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 177 bz BASED(stack_overflow) 1783: 179#endif 1802: 181 .endm 182 183 .macro CREATE_STACK_FRAME psworg,savearea 184 s %r15,BASED(.Lc_spsize) # make room for registers & psw 185 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 186 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 187 icm %r12,3,__LC_SVC_ILC 188 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 189 st %r12,SP_SVCNR(%r15) 190 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 191 la %r12,0 192 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 193 .endm 194 195 .macro RESTORE_ALL psworg,sync 196 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 197 .if !\sync 198 ni \psworg+1,0xfd # clear wait state bit 199 .endif 200 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 201 STORE_TIMER __LC_EXIT_TIMER 202 lpsw \psworg # back to caller 203 .endm 204 205/* 206 * Scheduler resume function, called by switch_to 207 * gpr2 = (task_struct *) prev 208 * gpr3 = (task_struct *) next 209 * Returns: 210 * gpr2 = prev 211 */ 212 .globl __switch_to 213__switch_to: 214 basr %r1,0 215__switch_to_base: 216 tm __THREAD_per(%r3),0xe8 # new process is using per ? 217 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 218 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 219 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 220 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 221 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 222__switch_to_noper: 223 l %r4,__THREAD_info(%r2) # get thread_info of prev 224 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 225 bz __switch_to_no_mcck-__switch_to_base(%r1) 226 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 227 l %r4,__THREAD_info(%r3) # get thread_info of next 228 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 229__switch_to_no_mcck: 230 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 231 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 232 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 233 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 234 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 235 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 236 l %r3,__THREAD_info(%r3) # load thread_info from task struct 237 st %r3,__LC_THREAD_INFO 238 ahi %r3,STACK_SIZE 239 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 240 br %r14 241 242__critical_start: 243/* 244 * SVC interrupt handler routine. System calls are synchronous events and 245 * are executed with interrupts enabled. 246 */ 247 248 .globl system_call 249system_call: 250 STORE_TIMER __LC_SYNC_ENTER_TIMER 251sysc_saveall: 252 SAVE_ALL_BASE __LC_SAVE_AREA 253 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 254 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 255 lh %r7,0x8a # get svc number from lowcore 256#ifdef CONFIG_VIRT_CPU_ACCOUNTING 257sysc_vtime: 258 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 259sysc_stime: 260 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 261sysc_update: 262 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 263#endif 264sysc_do_svc: 265 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 266 ltr %r7,%r7 # test for svc 0 267 bnz BASED(sysc_nr_ok) # svc number > 0 268 # svc 0: system call number in %r1 269 cl %r1,BASED(.Lnr_syscalls) 270 bnl BASED(sysc_nr_ok) 271 lr %r7,%r1 # copy svc number to %r7 272sysc_nr_ok: 273 mvc SP_ARGS(4,%r15),SP_R7(%r15) 274sysc_do_restart: 275 sth %r7,SP_SVCNR(%r15) 276 sll %r7,2 # svc number *4 277 l %r8,BASED(.Lsysc_table) 278 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 279 l %r8,0(%r7,%r8) # get system call addr. 280 bnz BASED(sysc_tracesys) 281 basr %r14,%r8 # call sys_xxxx 282 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 283 284sysc_return: 285 tm __TI_flags+3(%r9),_TIF_WORK_SVC 286 bnz BASED(sysc_work) # there is work to do (signals etc.) 287sysc_restore: 288#ifdef CONFIG_TRACE_IRQFLAGS 289 la %r1,BASED(sysc_restore_trace_psw) 290 lpsw 0(%r1) 291sysc_restore_trace: 292 TRACE_IRQS_CHECK 293 LOCKDEP_SYS_EXIT 294#endif 295sysc_leave: 296 RESTORE_ALL __LC_RETURN_PSW,1 297sysc_done: 298 299#ifdef CONFIG_TRACE_IRQFLAGS 300 .align 8 301 .globl sysc_restore_trace_psw 302sysc_restore_trace_psw: 303 .long 0, sysc_restore_trace + 0x80000000 304#endif 305 306# 307# recheck if there is more work to do 308# 309sysc_work_loop: 310 tm __TI_flags+3(%r9),_TIF_WORK_SVC 311 bz BASED(sysc_restore) # there is no work to do 312# 313# One of the work bits is on. Find out which one. 314# 315sysc_work: 316 tm SP_PSW+1(%r15),0x01 # returning to user ? 317 bno BASED(sysc_restore) 318 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 319 bo BASED(sysc_mcck_pending) 320 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 321 bo BASED(sysc_reschedule) 322 tm __TI_flags+3(%r9),_TIF_SIGPENDING 323 bnz BASED(sysc_sigpending) 324 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 325 bnz BASED(sysc_notify_resume) 326 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 327 bo BASED(sysc_restart) 328 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 329 bo BASED(sysc_singlestep) 330 b BASED(sysc_restore) 331sysc_work_done: 332 333# 334# _TIF_NEED_RESCHED is set, call schedule 335# 336sysc_reschedule: 337 l %r1,BASED(.Lschedule) 338 la %r14,BASED(sysc_work_loop) 339 br %r1 # call scheduler 340 341# 342# _TIF_MCCK_PENDING is set, call handler 343# 344sysc_mcck_pending: 345 l %r1,BASED(.Ls390_handle_mcck) 346 la %r14,BASED(sysc_work_loop) 347 br %r1 # TIF bit will be cleared by handler 348 349# 350# _TIF_SIGPENDING is set, call do_signal 351# 352sysc_sigpending: 353 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 354 la %r2,SP_PTREGS(%r15) # load pt_regs 355 l %r1,BASED(.Ldo_signal) 356 basr %r14,%r1 # call do_signal 357 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 358 bo BASED(sysc_restart) 359 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 360 bo BASED(sysc_singlestep) 361 b BASED(sysc_work_loop) 362 363# 364# _TIF_NOTIFY_RESUME is set, call do_notify_resume 365# 366sysc_notify_resume: 367 la %r2,SP_PTREGS(%r15) # load pt_regs 368 l %r1,BASED(.Ldo_notify_resume) 369 la %r14,BASED(sysc_work_loop) 370 br %r1 # call do_notify_resume 371 372 373# 374# _TIF_RESTART_SVC is set, set up registers and restart svc 375# 376sysc_restart: 377 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 378 l %r7,SP_R2(%r15) # load new svc number 379 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 380 lm %r2,%r6,SP_R2(%r15) # load svc arguments 381 b BASED(sysc_do_restart) # restart svc 382 383# 384# _TIF_SINGLE_STEP is set, call do_single_step 385# 386sysc_singlestep: 387 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 388 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 389 mvi SP_SVCNR+1(%r15),0xff 390 la %r2,SP_PTREGS(%r15) # address of register-save area 391 l %r1,BASED(.Lhandle_per) # load adr. of per handler 392 la %r14,BASED(sysc_return) # load adr. of system return 393 br %r1 # branch to do_single_step 394 395# 396# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 397# and after the system call 398# 399sysc_tracesys: 400 l %r1,BASED(.Ltrace_entry) 401 la %r2,SP_PTREGS(%r15) # load pt_regs 402 la %r3,0 403 srl %r7,2 404 st %r7,SP_R2(%r15) 405 basr %r14,%r1 406 cl %r2,BASED(.Lnr_syscalls) 407 bnl BASED(sysc_tracenogo) 408 l %r8,BASED(.Lsysc_table) 409 lr %r7,%r2 410 sll %r7,2 # svc number *4 411 l %r8,0(%r7,%r8) 412sysc_tracego: 413 lm %r3,%r6,SP_R3(%r15) 414 l %r2,SP_ORIG_R2(%r15) 415 basr %r14,%r8 # call sys_xxx 416 st %r2,SP_R2(%r15) # store return value 417sysc_tracenogo: 418 tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 419 bz BASED(sysc_return) 420 l %r1,BASED(.Ltrace_exit) 421 la %r2,SP_PTREGS(%r15) # load pt_regs 422 la %r14,BASED(sysc_return) 423 br %r1 424 425# 426# a new process exits the kernel with ret_from_fork 427# 428 .globl ret_from_fork 429ret_from_fork: 430 l %r13,__LC_SVC_NEW_PSW+4 431 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 432 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 433 bo BASED(0f) 434 st %r15,SP_R15(%r15) # store stack pointer for new kthread 4350: l %r1,BASED(.Lschedtail) 436 basr %r14,%r1 437 TRACE_IRQS_ON 438 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 439 b BASED(sysc_return) 440 441# 442# kernel_execve function needs to deal with pt_regs that is not 443# at the usual place 444# 445 .globl kernel_execve 446kernel_execve: 447 stm %r12,%r15,48(%r15) 448 lr %r14,%r15 449 l %r13,__LC_SVC_NEW_PSW+4 450 s %r15,BASED(.Lc_spsize) 451 st %r14,__SF_BACKCHAIN(%r15) 452 la %r12,SP_PTREGS(%r15) 453 xc 0(__PT_SIZE,%r12),0(%r12) 454 l %r1,BASED(.Ldo_execve) 455 lr %r5,%r12 456 basr %r14,%r1 457 ltr %r2,%r2 458 be BASED(0f) 459 a %r15,BASED(.Lc_spsize) 460 lm %r12,%r15,48(%r15) 461 br %r14 462 # execve succeeded. 4630: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 464 l %r15,__LC_KERNEL_STACK # load ksp 465 s %r15,BASED(.Lc_spsize) # make room for registers & psw 466 l %r9,__LC_THREAD_INFO 467 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 468 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 469 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 470 l %r1,BASED(.Lexecve_tail) 471 basr %r14,%r1 472 b BASED(sysc_return) 473 474/* 475 * Program check handler routine 476 */ 477 478 .globl pgm_check_handler 479pgm_check_handler: 480/* 481 * First we need to check for a special case: 482 * Single stepping an instruction that disables the PER event mask will 483 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 484 * For a single stepped SVC the program check handler gets control after 485 * the SVC new PSW has been loaded. But we want to execute the SVC first and 486 * then handle the PER event. Therefore we update the SVC old PSW to point 487 * to the pgm_check_handler and branch to the SVC handler after we checked 488 * if we have to load the kernel stack register. 489 * For every other possible cause for PER event without the PER mask set 490 * we just ignore the PER event (FIXME: is there anything we have to do 491 * for LPSW?). 492 */ 493 STORE_TIMER __LC_SYNC_ENTER_TIMER 494 SAVE_ALL_BASE __LC_SAVE_AREA 495 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 496 bnz BASED(pgm_per) # got per exception -> special case 497 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 498 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 499#ifdef CONFIG_VIRT_CPU_ACCOUNTING 500 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 501 bz BASED(pgm_no_vtime) 502 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 503 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 504 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 505pgm_no_vtime: 506#endif 507 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 508 TRACE_IRQS_OFF 509 l %r3,__LC_PGM_ILC # load program interruption code 510 la %r8,0x7f 511 nr %r8,%r3 512pgm_do_call: 513 l %r7,BASED(.Ljump_table) 514 sll %r8,2 515 l %r7,0(%r8,%r7) # load address of handler routine 516 la %r2,SP_PTREGS(%r15) # address of register-save area 517 la %r14,BASED(sysc_return) 518 br %r7 # branch to interrupt-handler 519 520# 521# handle per exception 522# 523pgm_per: 524 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 525 bnz BASED(pgm_per_std) # ok, normal per event from user space 526# ok its one of the special cases, now we need to find out which one 527 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 528 be BASED(pgm_svcper) 529# no interesting special case, ignore PER event 530 lm %r12,%r15,__LC_SAVE_AREA 531 lpsw 0x28 532 533# 534# Normal per exception 535# 536pgm_per_std: 537 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 538 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 539#ifdef CONFIG_VIRT_CPU_ACCOUNTING 540 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 541 bz BASED(pgm_no_vtime2) 542 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 543 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 544 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 545pgm_no_vtime2: 546#endif 547 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 548 TRACE_IRQS_OFF 549 l %r1,__TI_task(%r9) 550 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 551 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 552 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 553 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 554 tm SP_PSW+1(%r15),0x01 # kernel per event ? 555 bz BASED(kernel_per) 556 l %r3,__LC_PGM_ILC # load program interruption code 557 la %r8,0x7f 558 nr %r8,%r3 # clear per-event-bit and ilc 559 be BASED(sysc_return) # only per or per+check ? 560 b BASED(pgm_do_call) 561 562# 563# it was a single stepped SVC that is causing all the trouble 564# 565pgm_svcper: 566 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 567 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 568#ifdef CONFIG_VIRT_CPU_ACCOUNTING 569 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 570 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 571 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 572#endif 573 lh %r7,0x8a # get svc number from lowcore 574 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 575 TRACE_IRQS_OFF 576 l %r1,__TI_task(%r9) 577 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 578 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 579 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 580 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 581 TRACE_IRQS_ON 582 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 583 b BASED(sysc_do_svc) 584 585# 586# per was called from kernel, must be kprobes 587# 588kernel_per: 589 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 590 mvi SP_SVCNR+1(%r15),0xff 591 la %r2,SP_PTREGS(%r15) # address of register-save area 592 l %r1,BASED(.Lhandle_per) # load adr. of per handler 593 la %r14,BASED(sysc_restore)# load adr. of system return 594 br %r1 # branch to do_single_step 595 596/* 597 * IO interrupt handler routine 598 */ 599 600 .globl io_int_handler 601io_int_handler: 602 STORE_TIMER __LC_ASYNC_ENTER_TIMER 603 stck __LC_INT_CLOCK 604 SAVE_ALL_BASE __LC_SAVE_AREA+16 605 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 606 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 607#ifdef CONFIG_VIRT_CPU_ACCOUNTING 608 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 609 bz BASED(io_no_vtime) 610 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 611 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 612 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 613io_no_vtime: 614#endif 615 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 616 TRACE_IRQS_OFF 617 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 618 la %r2,SP_PTREGS(%r15) # address of register-save area 619 basr %r14,%r1 # branch to standard irq handler 620io_return: 621 tm __TI_flags+3(%r9),_TIF_WORK_INT 622 bnz BASED(io_work) # there is work to do (signals etc.) 623io_restore: 624#ifdef CONFIG_TRACE_IRQFLAGS 625 la %r1,BASED(io_restore_trace_psw) 626 lpsw 0(%r1) 627io_restore_trace: 628 TRACE_IRQS_CHECK 629 LOCKDEP_SYS_EXIT 630#endif 631io_leave: 632 RESTORE_ALL __LC_RETURN_PSW,0 633io_done: 634 635#ifdef CONFIG_TRACE_IRQFLAGS 636 .align 8 637 .globl io_restore_trace_psw 638io_restore_trace_psw: 639 .long 0, io_restore_trace + 0x80000000 640#endif 641 642# 643# switch to kernel stack, then check the TIF bits 644# 645io_work: 646 tm SP_PSW+1(%r15),0x01 # returning to user ? 647#ifndef CONFIG_PREEMPT 648 bno BASED(io_restore) # no-> skip resched & signal 649#else 650 bnz BASED(io_work_user) # no -> check for preemptive scheduling 651 # check for preemptive scheduling 652 icm %r0,15,__TI_precount(%r9) 653 bnz BASED(io_restore) # preemption disabled 654 l %r1,SP_R15(%r15) 655 s %r1,BASED(.Lc_spsize) 656 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 657 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 658 lr %r15,%r1 659io_resume_loop: 660 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 661 bno BASED(io_restore) 662 l %r1,BASED(.Lpreempt_schedule_irq) 663 la %r14,BASED(io_resume_loop) 664 br %r1 # call schedule 665#endif 666 667io_work_user: 668 l %r1,__LC_KERNEL_STACK 669 s %r1,BASED(.Lc_spsize) 670 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 671 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 672 lr %r15,%r1 673# 674# One of the work bits is on. Find out which one. 675# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED 676# and _TIF_MCCK_PENDING 677# 678io_work_loop: 679 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 680 bo BASED(io_mcck_pending) 681 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 682 bo BASED(io_reschedule) 683 tm __TI_flags+3(%r9),_TIF_SIGPENDING 684 bnz BASED(io_sigpending) 685 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 686 bnz BASED(io_notify_resume) 687 b BASED(io_restore) 688io_work_done: 689 690# 691# _TIF_MCCK_PENDING is set, call handler 692# 693io_mcck_pending: 694 l %r1,BASED(.Ls390_handle_mcck) 695 basr %r14,%r1 # TIF bit will be cleared by handler 696 b BASED(io_work_loop) 697 698# 699# _TIF_NEED_RESCHED is set, call schedule 700# 701io_reschedule: 702 TRACE_IRQS_ON 703 l %r1,BASED(.Lschedule) 704 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 705 basr %r14,%r1 # call scheduler 706 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 707 TRACE_IRQS_OFF 708 tm __TI_flags+3(%r9),_TIF_WORK_INT 709 bz BASED(io_restore) # there is no work to do 710 b BASED(io_work_loop) 711 712# 713# _TIF_SIGPENDING is set, call do_signal 714# 715io_sigpending: 716 TRACE_IRQS_ON 717 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 718 la %r2,SP_PTREGS(%r15) # load pt_regs 719 l %r1,BASED(.Ldo_signal) 720 basr %r14,%r1 # call do_signal 721 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 722 TRACE_IRQS_OFF 723 b BASED(io_work_loop) 724 725# 726# _TIF_SIGPENDING is set, call do_signal 727# 728io_notify_resume: 729 TRACE_IRQS_ON 730 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 731 la %r2,SP_PTREGS(%r15) # load pt_regs 732 l %r1,BASED(.Ldo_notify_resume) 733 basr %r14,%r1 # call do_signal 734 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 735 TRACE_IRQS_OFF 736 b BASED(io_work_loop) 737 738/* 739 * External interrupt handler routine 740 */ 741 742 .globl ext_int_handler 743ext_int_handler: 744 STORE_TIMER __LC_ASYNC_ENTER_TIMER 745 stck __LC_INT_CLOCK 746 SAVE_ALL_BASE __LC_SAVE_AREA+16 747 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 748 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 749#ifdef CONFIG_VIRT_CPU_ACCOUNTING 750 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 751 bz BASED(ext_no_vtime) 752 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 753 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 754 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 755ext_no_vtime: 756#endif 757 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 758 TRACE_IRQS_OFF 759 la %r2,SP_PTREGS(%r15) # address of register-save area 760 lh %r3,__LC_EXT_INT_CODE # get interruption code 761 l %r1,BASED(.Ldo_extint) 762 basr %r14,%r1 763 b BASED(io_return) 764 765__critical_end: 766 767/* 768 * Machine check handler routines 769 */ 770 771 .globl mcck_int_handler 772mcck_int_handler: 773 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 774 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 775 SAVE_ALL_BASE __LC_SAVE_AREA+32 776 la %r12,__LC_MCK_OLD_PSW 777 tm __LC_MCCK_CODE,0x80 # system damage? 778 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 779#ifdef CONFIG_VIRT_CPU_ACCOUNTING 780 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 781 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 782 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 783 bo BASED(1f) 784 la %r14,__LC_SYNC_ENTER_TIMER 785 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 786 bl BASED(0f) 787 la %r14,__LC_ASYNC_ENTER_TIMER 7880: clc 0(8,%r14),__LC_EXIT_TIMER 789 bl BASED(0f) 790 la %r14,__LC_EXIT_TIMER 7910: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 792 bl BASED(0f) 793 la %r14,__LC_LAST_UPDATE_TIMER 7940: spt 0(%r14) 795 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7961: 797#endif 798 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 799 bno BASED(mcck_int_main) # no -> skip cleanup critical 800 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 801 bnz BASED(mcck_int_main) # from user -> load async stack 802 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 803 bhe BASED(mcck_int_main) 804 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 805 bl BASED(mcck_int_main) 806 l %r14,BASED(.Lcleanup_critical) 807 basr %r14,%r14 808mcck_int_main: 809 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 810 slr %r14,%r15 811 sra %r14,PAGE_SHIFT 812 be BASED(0f) 813 l %r15,__LC_PANIC_STACK # load panic stack 8140: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 815#ifdef CONFIG_VIRT_CPU_ACCOUNTING 816 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 817 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 818 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 819 bz BASED(mcck_no_vtime) 820 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 821 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 822 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 823mcck_no_vtime: 824#endif 825 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 826 la %r2,SP_PTREGS(%r15) # load pt_regs 827 l %r1,BASED(.Ls390_mcck) 828 basr %r14,%r1 # call machine check handler 829 tm SP_PSW+1(%r15),0x01 # returning to user ? 830 bno BASED(mcck_return) 831 l %r1,__LC_KERNEL_STACK # switch to kernel stack 832 s %r1,BASED(.Lc_spsize) 833 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 834 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 835 lr %r15,%r1 836 stosm __SF_EMPTY(%r15),0x04 # turn dat on 837 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 838 bno BASED(mcck_return) 839 TRACE_IRQS_OFF 840 l %r1,BASED(.Ls390_handle_mcck) 841 basr %r14,%r1 # call machine check handler 842 TRACE_IRQS_ON 843mcck_return: 844 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 845 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 846#ifdef CONFIG_VIRT_CPU_ACCOUNTING 847 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 848 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 849 bno BASED(0f) 850 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 851 stpt __LC_EXIT_TIMER 852 lpsw __LC_RETURN_MCCK_PSW # back to caller 8530: 854#endif 855 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 856 lpsw __LC_RETURN_MCCK_PSW # back to caller 857 858 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 859 860/* 861 * Restart interruption handler, kick starter for additional CPUs 862 */ 863#ifdef CONFIG_SMP 864 __CPUINIT 865 .globl restart_int_handler 866restart_int_handler: 867 l %r15,__LC_SAVE_AREA+60 # load ksp 868 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 869 lam %a0,%a15,__LC_AREGS_SAVE_AREA 870 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 871 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 872 basr %r14,0 873 l %r14,restart_addr-.(%r14) 874 br %r14 # branch to start_secondary 875restart_addr: 876 .long start_secondary 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#ifdef CONFIG_VIRT_CPU_ACCOUNTING 980 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 981 bh BASED(0f) 982 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9830: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 984 bhe BASED(cleanup_vtime) 985#endif 986 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 987 bh BASED(0f) 988 mvc __LC_SAVE_AREA(16),0(%r12) 9890: st %r13,4(%r12) 990 st %r12,__LC_SAVE_AREA+48 # argh 991 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 992 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 993 l %r12,__LC_SAVE_AREA+48 # argh 994 st %r15,12(%r12) 995 lh %r7,0x8a 996#ifdef CONFIG_VIRT_CPU_ACCOUNTING 997cleanup_vtime: 998 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 999 bhe BASED(cleanup_stime) 1000 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 1001cleanup_stime: 1002 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 1003 bh BASED(cleanup_update) 1004 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 1005cleanup_update: 1006 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 1007#endif 1008 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 1009 la %r12,__LC_RETURN_PSW 1010 br %r14 1011cleanup_system_call_insn: 1012 .long sysc_saveall + 0x80000000 1013#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1014 .long system_call + 0x80000000 1015 .long sysc_vtime + 0x80000000 1016 .long sysc_stime + 0x80000000 1017 .long sysc_update + 0x80000000 1018#endif 1019 1020cleanup_sysc_return: 1021 mvc __LC_RETURN_PSW(4),0(%r12) 1022 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 1023 la %r12,__LC_RETURN_PSW 1024 br %r14 1025 1026cleanup_sysc_leave: 1027 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 1028 be BASED(2f) 1029#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1030 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1031 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 1032 be BASED(2f) 1033#endif 1034 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1035 c %r12,BASED(.Lmck_old_psw) 1036 bne BASED(0f) 1037 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1038 b BASED(1f) 10390: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10401: lm %r0,%r11,SP_R0(%r15) 1041 l %r15,SP_R15(%r15) 10422: la %r12,__LC_RETURN_PSW 1043 br %r14 1044cleanup_sysc_leave_insn: 1045 .long sysc_done - 4 + 0x80000000 1046#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1047 .long sysc_done - 8 + 0x80000000 1048#endif 1049 1050cleanup_io_return: 1051 mvc __LC_RETURN_PSW(4),0(%r12) 1052 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 1053 la %r12,__LC_RETURN_PSW 1054 br %r14 1055 1056cleanup_io_leave: 1057 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 1058 be BASED(2f) 1059#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1060 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1061 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 1062 be BASED(2f) 1063#endif 1064 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1065 c %r12,BASED(.Lmck_old_psw) 1066 bne BASED(0f) 1067 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1068 b BASED(1f) 10690: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10701: lm %r0,%r11,SP_R0(%r15) 1071 l %r15,SP_R15(%r15) 10722: la %r12,__LC_RETURN_PSW 1073 br %r14 1074cleanup_io_leave_insn: 1075 .long io_done - 4 + 0x80000000 1076#ifdef CONFIG_VIRT_CPU_ACCOUNTING 1077 .long io_done - 8 + 0x80000000 1078#endif 1079 1080/* 1081 * Integer constants 1082 */ 1083 .align 4 1084.Lc_spsize: .long SP_SIZE 1085.Lc_overhead: .long STACK_FRAME_OVERHEAD 1086.Lnr_syscalls: .long NR_syscalls 1087.L0x018: .short 0x018 1088.L0x020: .short 0x020 1089.L0x028: .short 0x028 1090.L0x030: .short 0x030 1091.L0x038: .short 0x038 1092.Lc_1: .long 1 1093 1094/* 1095 * Symbol constants 1096 */ 1097.Ls390_mcck: .long s390_do_machine_check 1098.Ls390_handle_mcck: 1099 .long s390_handle_mcck 1100.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1101.Ldo_IRQ: .long do_IRQ 1102.Ldo_extint: .long do_extint 1103.Ldo_signal: .long do_signal 1104.Ldo_notify_resume: 1105 .long do_notify_resume 1106.Lhandle_per: .long do_single_step 1107.Ldo_execve: .long do_execve 1108.Lexecve_tail: .long execve_tail 1109.Ljump_table: .long pgm_check_table 1110.Lschedule: .long schedule 1111#ifdef CONFIG_PREEMPT 1112.Lpreempt_schedule_irq: 1113 .long preempt_schedule_irq 1114#endif 1115.Ltrace_entry: .long do_syscall_trace_enter 1116.Ltrace_exit: .long do_syscall_trace_exit 1117.Lschedtail: .long schedule_tail 1118.Lsysc_table: .long sys_call_table 1119#ifdef CONFIG_TRACE_IRQFLAGS 1120.Ltrace_irq_on_caller: 1121 .long trace_hardirqs_on_caller 1122.Ltrace_irq_off_caller: 1123 .long trace_hardirqs_off_caller 1124#endif 1125#ifdef CONFIG_LOCKDEP 1126.Llockdep_sys_exit: 1127 .long lockdep_sys_exit 1128#endif 1129.Lcritical_start: 1130 .long __critical_start + 0x80000000 1131.Lcritical_end: 1132 .long __critical_end + 0x80000000 1133.Lcleanup_critical: 1134 .long cleanup_critical 1135 1136 .section .rodata, "a" 1137#define SYSCALL(esa,esame,emu) .long esa 1138sys_call_table: 1139#include "syscalls.S" 1140#undef SYSCALL 1141