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_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ 57 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) 58 59STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 60STACK_SIZE = 1 << STACK_SHIFT 61 62#define BASED(name) name-system_call(%r13) 63 64#ifdef CONFIG_TRACE_IRQFLAGS 65 .macro TRACE_IRQS_ON 66 basr %r2,%r0 67 l %r1,BASED(.Ltrace_irq_on_caller) 68 basr %r14,%r1 69 .endm 70 71 .macro TRACE_IRQS_OFF 72 basr %r2,%r0 73 l %r1,BASED(.Ltrace_irq_off_caller) 74 basr %r14,%r1 75 .endm 76 77 .macro TRACE_IRQS_CHECK 78 basr %r2,%r0 79 tm SP_PSW(%r15),0x03 # irqs enabled? 80 jz 0f 81 l %r1,BASED(.Ltrace_irq_on_caller) 82 basr %r14,%r1 83 j 1f 840: l %r1,BASED(.Ltrace_irq_off_caller) 85 basr %r14,%r1 861: 87 .endm 88#else 89#define TRACE_IRQS_ON 90#define TRACE_IRQS_OFF 91#define TRACE_IRQS_CHECK 92#endif 93 94#ifdef CONFIG_LOCKDEP 95 .macro LOCKDEP_SYS_EXIT 96 tm SP_PSW+1(%r15),0x01 # returning to user ? 97 jz 0f 98 l %r1,BASED(.Llockdep_sys_exit) 99 basr %r14,%r1 1000: 101 .endm 102#else 103#define LOCKDEP_SYS_EXIT 104#endif 105 106/* 107 * Register usage in interrupt handlers: 108 * R9 - pointer to current task structure 109 * R13 - pointer to literal pool 110 * R14 - return register for function calls 111 * R15 - kernel stack pointer 112 */ 113 114 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 115 lm %r10,%r11,\lc_from 116 sl %r10,\lc_to 117 sl %r11,\lc_to+4 118 bc 3,BASED(0f) 119 sl %r10,BASED(.Lc_1) 1200: al %r10,\lc_sum 121 al %r11,\lc_sum+4 122 bc 12,BASED(1f) 123 al %r10,BASED(.Lc_1) 1241: stm %r10,%r11,\lc_sum 125 .endm 126 127 .macro SAVE_ALL_BASE savearea 128 stm %r12,%r15,\savearea 129 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 130 .endm 131 132 .macro SAVE_ALL_SVC psworg,savearea 133 la %r12,\psworg 134 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 135 .endm 136 137 .macro SAVE_ALL_SYNC psworg,savearea 138 la %r12,\psworg 139 tm \psworg+1,0x01 # test problem state bit 140 bz BASED(2f) # skip stack setup save 141 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 142#ifdef CONFIG_CHECK_STACK 143 b BASED(3f) 1442: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 145 bz BASED(stack_overflow) 1463: 147#endif 1482: 149 .endm 150 151 .macro SAVE_ALL_ASYNC psworg,savearea 152 la %r12,\psworg 153 tm \psworg+1,0x01 # test problem state bit 154 bnz BASED(1f) # from user -> load async stack 155 clc \psworg+4(4),BASED(.Lcritical_end) 156 bhe BASED(0f) 157 clc \psworg+4(4),BASED(.Lcritical_start) 158 bl BASED(0f) 159 l %r14,BASED(.Lcleanup_critical) 160 basr %r14,%r14 161 tm 1(%r12),0x01 # retest problem state after cleanup 162 bnz BASED(1f) 1630: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 164 slr %r14,%r15 165 sra %r14,STACK_SHIFT 166 be BASED(2f) 1671: l %r15,__LC_ASYNC_STACK 168#ifdef CONFIG_CHECK_STACK 169 b BASED(3f) 1702: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 171 bz BASED(stack_overflow) 1723: 173#endif 1742: 175 .endm 176 177 .macro CREATE_STACK_FRAME psworg,savearea 178 s %r15,BASED(.Lc_spsize) # make room for registers & psw 179 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 180 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 181 icm %r12,3,__LC_SVC_ILC 182 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 183 st %r12,SP_SVCNR(%r15) 184 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 185 la %r12,0 186 st %r12,__SF_BACKCHAIN(%r15) # clear back chain 187 .endm 188 189 .macro RESTORE_ALL psworg,sync 190 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 191 .if !\sync 192 ni \psworg+1,0xfd # clear wait state bit 193 .endif 194 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 195 stpt __LC_EXIT_TIMER 196 lpsw \psworg # back to caller 197 .endm 198 199/* 200 * Scheduler resume function, called by switch_to 201 * gpr2 = (task_struct *) prev 202 * gpr3 = (task_struct *) next 203 * Returns: 204 * gpr2 = prev 205 */ 206 .globl __switch_to 207__switch_to: 208 basr %r1,0 209__switch_to_base: 210 tm __THREAD_per(%r3),0xe8 # new process is using per ? 211 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine 212 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff 213 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) 214 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's 215 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't 216__switch_to_noper: 217 l %r4,__THREAD_info(%r2) # get thread_info of prev 218 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 219 bz __switch_to_no_mcck-__switch_to_base(%r1) 220 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 221 l %r4,__THREAD_info(%r3) # get thread_info of next 222 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next 223__switch_to_no_mcck: 224 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task 225 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp 226 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp 227 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task 228 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct 229 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 230 l %r3,__THREAD_info(%r3) # load thread_info from task struct 231 st %r3,__LC_THREAD_INFO 232 ahi %r3,STACK_SIZE 233 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack 234 br %r14 235 236__critical_start: 237/* 238 * SVC interrupt handler routine. System calls are synchronous events and 239 * are executed with interrupts enabled. 240 */ 241 242 .globl system_call 243system_call: 244 stpt __LC_SYNC_ENTER_TIMER 245sysc_saveall: 246 SAVE_ALL_BASE __LC_SAVE_AREA 247 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 248 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 249 lh %r7,0x8a # get svc number from lowcore 250sysc_vtime: 251 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 252sysc_stime: 253 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 254sysc_update: 255 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 256sysc_do_svc: 257 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 258 ltr %r7,%r7 # test for svc 0 259 bnz BASED(sysc_nr_ok) # svc number > 0 260 # svc 0: system call number in %r1 261 cl %r1,BASED(.Lnr_syscalls) 262 bnl BASED(sysc_nr_ok) 263 lr %r7,%r1 # copy svc number to %r7 264sysc_nr_ok: 265 mvc SP_ARGS(4,%r15),SP_R7(%r15) 266sysc_do_restart: 267 sth %r7,SP_SVCNR(%r15) 268 sll %r7,2 # svc number *4 269 l %r8,BASED(.Lsysc_table) 270 tm __TI_flags+2(%r9),_TIF_SYSCALL 271 l %r8,0(%r7,%r8) # get system call addr. 272 bnz BASED(sysc_tracesys) 273 basr %r14,%r8 # call sys_xxxx 274 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 275 276sysc_return: 277 tm __TI_flags+3(%r9),_TIF_WORK_SVC 278 bnz BASED(sysc_work) # there is work to do (signals etc.) 279sysc_restore: 280#ifdef CONFIG_TRACE_IRQFLAGS 281 la %r1,BASED(sysc_restore_trace_psw_addr) 282 l %r1,0(%r1) 283 lpsw 0(%r1) 284sysc_restore_trace: 285 TRACE_IRQS_CHECK 286 LOCKDEP_SYS_EXIT 287#endif 288sysc_leave: 289 RESTORE_ALL __LC_RETURN_PSW,1 290sysc_done: 291 292#ifdef CONFIG_TRACE_IRQFLAGS 293sysc_restore_trace_psw_addr: 294 .long sysc_restore_trace_psw 295 296 .section .data,"aw",@progbits 297 .align 8 298 .globl sysc_restore_trace_psw 299sysc_restore_trace_psw: 300 .long 0, sysc_restore_trace + 0x80000000 301 .previous 302#endif 303 304# 305# recheck if there is more work to do 306# 307sysc_work_loop: 308 tm __TI_flags+3(%r9),_TIF_WORK_SVC 309 bz BASED(sysc_restore) # there is no work to do 310# 311# One of the work bits is on. Find out which one. 312# 313sysc_work: 314 tm SP_PSW+1(%r15),0x01 # returning to user ? 315 bno BASED(sysc_restore) 316 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 317 bo BASED(sysc_mcck_pending) 318 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 319 bo BASED(sysc_reschedule) 320 tm __TI_flags+3(%r9),_TIF_SIGPENDING 321 bnz BASED(sysc_sigpending) 322 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 323 bnz BASED(sysc_notify_resume) 324 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 325 bo BASED(sysc_restart) 326 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 327 bo BASED(sysc_singlestep) 328 b BASED(sysc_restore) 329sysc_work_done: 330 331# 332# _TIF_NEED_RESCHED is set, call schedule 333# 334sysc_reschedule: 335 l %r1,BASED(.Lschedule) 336 la %r14,BASED(sysc_work_loop) 337 br %r1 # call scheduler 338 339# 340# _TIF_MCCK_PENDING is set, call handler 341# 342sysc_mcck_pending: 343 l %r1,BASED(.Ls390_handle_mcck) 344 la %r14,BASED(sysc_work_loop) 345 br %r1 # TIF bit will be cleared by handler 346 347# 348# _TIF_SIGPENDING is set, call do_signal 349# 350sysc_sigpending: 351 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 352 la %r2,SP_PTREGS(%r15) # load pt_regs 353 l %r1,BASED(.Ldo_signal) 354 basr %r14,%r1 # call do_signal 355 tm __TI_flags+3(%r9),_TIF_RESTART_SVC 356 bo BASED(sysc_restart) 357 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP 358 bo BASED(sysc_singlestep) 359 b BASED(sysc_work_loop) 360 361# 362# _TIF_NOTIFY_RESUME is set, call do_notify_resume 363# 364sysc_notify_resume: 365 la %r2,SP_PTREGS(%r15) # load pt_regs 366 l %r1,BASED(.Ldo_notify_resume) 367 la %r14,BASED(sysc_work_loop) 368 br %r1 # call do_notify_resume 369 370 371# 372# _TIF_RESTART_SVC is set, set up registers and restart svc 373# 374sysc_restart: 375 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC 376 l %r7,SP_R2(%r15) # load new svc number 377 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument 378 lm %r2,%r6,SP_R2(%r15) # load svc arguments 379 b BASED(sysc_do_restart) # restart svc 380 381# 382# _TIF_SINGLE_STEP is set, call do_single_step 383# 384sysc_singlestep: 385 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP 386 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 387 mvi SP_SVCNR+1(%r15),0xff 388 la %r2,SP_PTREGS(%r15) # address of register-save area 389 l %r1,BASED(.Lhandle_per) # load adr. of per handler 390 la %r14,BASED(sysc_return) # load adr. of system return 391 br %r1 # branch to do_single_step 392 393# 394# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 395# and after the system call 396# 397sysc_tracesys: 398 l %r1,BASED(.Ltrace_entry) 399 la %r2,SP_PTREGS(%r15) # load pt_regs 400 la %r3,0 401 srl %r7,2 402 st %r7,SP_R2(%r15) 403 basr %r14,%r1 404 cl %r2,BASED(.Lnr_syscalls) 405 bnl BASED(sysc_tracenogo) 406 l %r8,BASED(.Lsysc_table) 407 lr %r7,%r2 408 sll %r7,2 # svc number *4 409 l %r8,0(%r7,%r8) 410sysc_tracego: 411 lm %r3,%r6,SP_R3(%r15) 412 l %r2,SP_ORIG_R2(%r15) 413 basr %r14,%r8 # call sys_xxx 414 st %r2,SP_R2(%r15) # store return value 415sysc_tracenogo: 416 tm __TI_flags+2(%r9),_TIF_SYSCALL 417 bz BASED(sysc_return) 418 l %r1,BASED(.Ltrace_exit) 419 la %r2,SP_PTREGS(%r15) # load pt_regs 420 la %r14,BASED(sysc_return) 421 br %r1 422 423# 424# a new process exits the kernel with ret_from_fork 425# 426 .globl ret_from_fork 427ret_from_fork: 428 l %r13,__LC_SVC_NEW_PSW+4 429 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 430 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 431 bo BASED(0f) 432 st %r15,SP_R15(%r15) # store stack pointer for new kthread 4330: l %r1,BASED(.Lschedtail) 434 basr %r14,%r1 435 TRACE_IRQS_ON 436 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 437 b BASED(sysc_tracenogo) 438 439# 440# kernel_execve function needs to deal with pt_regs that is not 441# at the usual place 442# 443 .globl kernel_execve 444kernel_execve: 445 stm %r12,%r15,48(%r15) 446 lr %r14,%r15 447 l %r13,__LC_SVC_NEW_PSW+4 448 s %r15,BASED(.Lc_spsize) 449 st %r14,__SF_BACKCHAIN(%r15) 450 la %r12,SP_PTREGS(%r15) 451 xc 0(__PT_SIZE,%r12),0(%r12) 452 l %r1,BASED(.Ldo_execve) 453 lr %r5,%r12 454 basr %r14,%r1 455 ltr %r2,%r2 456 be BASED(0f) 457 a %r15,BASED(.Lc_spsize) 458 lm %r12,%r15,48(%r15) 459 br %r14 460 # execve succeeded. 4610: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 462 l %r15,__LC_KERNEL_STACK # load ksp 463 s %r15,BASED(.Lc_spsize) # make room for registers & psw 464 l %r9,__LC_THREAD_INFO 465 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 466 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 467 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 468 l %r1,BASED(.Lexecve_tail) 469 basr %r14,%r1 470 b BASED(sysc_return) 471 472/* 473 * Program check handler routine 474 */ 475 476 .globl pgm_check_handler 477pgm_check_handler: 478/* 479 * First we need to check for a special case: 480 * Single stepping an instruction that disables the PER event mask will 481 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 482 * For a single stepped SVC the program check handler gets control after 483 * the SVC new PSW has been loaded. But we want to execute the SVC first and 484 * then handle the PER event. Therefore we update the SVC old PSW to point 485 * to the pgm_check_handler and branch to the SVC handler after we checked 486 * if we have to load the kernel stack register. 487 * For every other possible cause for PER event without the PER mask set 488 * we just ignore the PER event (FIXME: is there anything we have to do 489 * for LPSW?). 490 */ 491 stpt __LC_SYNC_ENTER_TIMER 492 SAVE_ALL_BASE __LC_SAVE_AREA 493 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 494 bnz BASED(pgm_per) # got per exception -> special case 495 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 496 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 497 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 498 bz BASED(pgm_no_vtime) 499 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 500 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 501 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 502pgm_no_vtime: 503 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 504 TRACE_IRQS_OFF 505 l %r3,__LC_PGM_ILC # load program interruption code 506 la %r8,0x7f 507 nr %r8,%r3 508pgm_do_call: 509 l %r7,BASED(.Ljump_table) 510 sll %r8,2 511 l %r7,0(%r8,%r7) # load address of handler routine 512 la %r2,SP_PTREGS(%r15) # address of register-save area 513 la %r14,BASED(sysc_return) 514 br %r7 # branch to interrupt-handler 515 516# 517# handle per exception 518# 519pgm_per: 520 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 521 bnz BASED(pgm_per_std) # ok, normal per event from user space 522# ok its one of the special cases, now we need to find out which one 523 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 524 be BASED(pgm_svcper) 525# no interesting special case, ignore PER event 526 lm %r12,%r15,__LC_SAVE_AREA 527 lpsw 0x28 528 529# 530# Normal per exception 531# 532pgm_per_std: 533 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA 534 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA 535 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 536 bz BASED(pgm_no_vtime2) 537 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 538 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 539 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 540pgm_no_vtime2: 541 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 542 TRACE_IRQS_OFF 543 l %r1,__TI_task(%r9) 544 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID 545 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS 546 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID 547 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 548 tm SP_PSW+1(%r15),0x01 # kernel per event ? 549 bz BASED(kernel_per) 550 l %r3,__LC_PGM_ILC # load program interruption code 551 la %r8,0x7f 552 nr %r8,%r3 # clear per-event-bit and ilc 553 be BASED(sysc_return) # only per or per+check ? 554 b BASED(pgm_do_call) 555 556# 557# it was a single stepped SVC that is causing all the trouble 558# 559pgm_svcper: 560 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 561 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 562 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 563 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 564 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 565 lh %r7,0x8a # get svc number from lowcore 566 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 567 TRACE_IRQS_OFF 568 l %r8,__TI_task(%r9) 569 mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID 570 mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS 571 mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID 572 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP 573 TRACE_IRQS_ON 574 lm %r2,%r6,SP_R2(%r15) # load svc arguments 575 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 576 b BASED(sysc_do_svc) 577 578# 579# per was called from kernel, must be kprobes 580# 581kernel_per: 582 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check 583 mvi SP_SVCNR+1(%r15),0xff 584 la %r2,SP_PTREGS(%r15) # address of register-save area 585 l %r1,BASED(.Lhandle_per) # load adr. of per handler 586 la %r14,BASED(sysc_restore)# load adr. of system return 587 br %r1 # branch to do_single_step 588 589/* 590 * IO interrupt handler routine 591 */ 592 593 .globl io_int_handler 594io_int_handler: 595 stck __LC_INT_CLOCK 596 stpt __LC_ASYNC_ENTER_TIMER 597 SAVE_ALL_BASE __LC_SAVE_AREA+16 598 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 599 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 600 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 601 bz BASED(io_no_vtime) 602 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 603 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 604 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 605io_no_vtime: 606 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 607 TRACE_IRQS_OFF 608 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 609 la %r2,SP_PTREGS(%r15) # address of register-save area 610 basr %r14,%r1 # branch to standard irq handler 611io_return: 612 tm __TI_flags+3(%r9),_TIF_WORK_INT 613 bnz BASED(io_work) # there is work to do (signals etc.) 614io_restore: 615#ifdef CONFIG_TRACE_IRQFLAGS 616 la %r1,BASED(io_restore_trace_psw_addr) 617 l %r1,0(%r1) 618 lpsw 0(%r1) 619io_restore_trace: 620 TRACE_IRQS_CHECK 621 LOCKDEP_SYS_EXIT 622#endif 623io_leave: 624 RESTORE_ALL __LC_RETURN_PSW,0 625io_done: 626 627#ifdef CONFIG_TRACE_IRQFLAGS 628io_restore_trace_psw_addr: 629 .long io_restore_trace_psw 630 631 .section .data,"aw",@progbits 632 .align 8 633 .globl io_restore_trace_psw 634io_restore_trace_psw: 635 .long 0, io_restore_trace + 0x80000000 636 .previous 637#endif 638 639# 640# switch to kernel stack, then check the TIF bits 641# 642io_work: 643 tm SP_PSW+1(%r15),0x01 # returning to user ? 644#ifndef CONFIG_PREEMPT 645 bno BASED(io_restore) # no-> skip resched & signal 646#else 647 bnz BASED(io_work_user) # no -> check for preemptive scheduling 648 # check for preemptive scheduling 649 icm %r0,15,__TI_precount(%r9) 650 bnz BASED(io_restore) # preemption disabled 651 l %r1,SP_R15(%r15) 652 s %r1,BASED(.Lc_spsize) 653 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 654 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 655 lr %r15,%r1 656io_resume_loop: 657 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 658 bno BASED(io_restore) 659 l %r1,BASED(.Lpreempt_schedule_irq) 660 la %r14,BASED(io_resume_loop) 661 br %r1 # call schedule 662#endif 663 664io_work_user: 665 l %r1,__LC_KERNEL_STACK 666 s %r1,BASED(.Lc_spsize) 667 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 668 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 669 lr %r15,%r1 670# 671# One of the work bits is on. Find out which one. 672# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED 673# and _TIF_MCCK_PENDING 674# 675io_work_loop: 676 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 677 bo BASED(io_mcck_pending) 678 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED 679 bo BASED(io_reschedule) 680 tm __TI_flags+3(%r9),_TIF_SIGPENDING 681 bnz BASED(io_sigpending) 682 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME 683 bnz BASED(io_notify_resume) 684 b BASED(io_restore) 685io_work_done: 686 687# 688# _TIF_MCCK_PENDING is set, call handler 689# 690io_mcck_pending: 691 l %r1,BASED(.Ls390_handle_mcck) 692 basr %r14,%r1 # TIF bit will be cleared by handler 693 b BASED(io_work_loop) 694 695# 696# _TIF_NEED_RESCHED is set, call schedule 697# 698io_reschedule: 699 TRACE_IRQS_ON 700 l %r1,BASED(.Lschedule) 701 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 702 basr %r14,%r1 # call scheduler 703 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 704 TRACE_IRQS_OFF 705 tm __TI_flags+3(%r9),_TIF_WORK_INT 706 bz BASED(io_restore) # there is no work to do 707 b BASED(io_work_loop) 708 709# 710# _TIF_SIGPENDING is set, call do_signal 711# 712io_sigpending: 713 TRACE_IRQS_ON 714 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 715 la %r2,SP_PTREGS(%r15) # load pt_regs 716 l %r1,BASED(.Ldo_signal) 717 basr %r14,%r1 # call do_signal 718 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 719 TRACE_IRQS_OFF 720 b BASED(io_work_loop) 721 722# 723# _TIF_SIGPENDING is set, call do_signal 724# 725io_notify_resume: 726 TRACE_IRQS_ON 727 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 728 la %r2,SP_PTREGS(%r15) # load pt_regs 729 l %r1,BASED(.Ldo_notify_resume) 730 basr %r14,%r1 # call do_signal 731 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 732 TRACE_IRQS_OFF 733 b BASED(io_work_loop) 734 735/* 736 * External interrupt handler routine 737 */ 738 739 .globl ext_int_handler 740ext_int_handler: 741 stck __LC_INT_CLOCK 742 stpt __LC_ASYNC_ENTER_TIMER 743 SAVE_ALL_BASE __LC_SAVE_AREA+16 744 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 745 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 746 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 747 bz BASED(ext_no_vtime) 748 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 749 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 750 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 751ext_no_vtime: 752 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 753 TRACE_IRQS_OFF 754 la %r2,SP_PTREGS(%r15) # address of register-save area 755 lh %r3,__LC_EXT_INT_CODE # get interruption code 756 l %r1,BASED(.Ldo_extint) 757 basr %r14,%r1 758 b BASED(io_return) 759 760__critical_end: 761 762/* 763 * Machine check handler routines 764 */ 765 766 .globl mcck_int_handler 767mcck_int_handler: 768 stck __LC_INT_CLOCK 769 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 770 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 771 SAVE_ALL_BASE __LC_SAVE_AREA+32 772 la %r12,__LC_MCK_OLD_PSW 773 tm __LC_MCCK_CODE,0x80 # system damage? 774 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 775 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER 776 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 777 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 778 bo BASED(1f) 779 la %r14,__LC_SYNC_ENTER_TIMER 780 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 781 bl BASED(0f) 782 la %r14,__LC_ASYNC_ENTER_TIMER 7830: clc 0(8,%r14),__LC_EXIT_TIMER 784 bl BASED(0f) 785 la %r14,__LC_EXIT_TIMER 7860: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 787 bl BASED(0f) 788 la %r14,__LC_LAST_UPDATE_TIMER 7890: spt 0(%r14) 790 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) 7911: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 792 bno BASED(mcck_int_main) # no -> skip cleanup critical 793 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 794 bnz BASED(mcck_int_main) # from user -> load async stack 795 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 796 bhe BASED(mcck_int_main) 797 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 798 bl BASED(mcck_int_main) 799 l %r14,BASED(.Lcleanup_critical) 800 basr %r14,%r14 801mcck_int_main: 802 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 803 slr %r14,%r15 804 sra %r14,PAGE_SHIFT 805 be BASED(0f) 806 l %r15,__LC_PANIC_STACK # load panic stack 8070: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 808 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 809 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 810 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 811 bz BASED(mcck_no_vtime) 812 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 813 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 814 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 815mcck_no_vtime: 816 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct 817 la %r2,SP_PTREGS(%r15) # load pt_regs 818 l %r1,BASED(.Ls390_mcck) 819 basr %r14,%r1 # call machine check handler 820 tm SP_PSW+1(%r15),0x01 # returning to user ? 821 bno BASED(mcck_return) 822 l %r1,__LC_KERNEL_STACK # switch to kernel stack 823 s %r1,BASED(.Lc_spsize) 824 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 825 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 826 lr %r15,%r1 827 stosm __SF_EMPTY(%r15),0x04 # turn dat on 828 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING 829 bno BASED(mcck_return) 830 TRACE_IRQS_OFF 831 l %r1,BASED(.Ls390_handle_mcck) 832 basr %r14,%r1 # call machine check handler 833 TRACE_IRQS_ON 834mcck_return: 835 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 836 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 837 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 838 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 839 bno BASED(0f) 840 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 841 stpt __LC_EXIT_TIMER 842 lpsw __LC_RETURN_MCCK_PSW # back to caller 8430: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 844 lpsw __LC_RETURN_MCCK_PSW # back to caller 845 846 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 847 848/* 849 * Restart interruption handler, kick starter for additional CPUs 850 */ 851#ifdef CONFIG_SMP 852 __CPUINIT 853 .globl restart_int_handler 854restart_int_handler: 855 basr %r1,0 856restart_base: 857 spt restart_vtime-restart_base(%r1) 858 stck __LC_LAST_UPDATE_CLOCK 859 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 860 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 861 l %r15,__LC_SAVE_AREA+60 # load ksp 862 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 863 lam %a0,%a15,__LC_AREGS_SAVE_AREA 864 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 865 l %r1,__LC_THREAD_INFO 866 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 867 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 868 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 869 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 870 basr %r14,0 871 l %r14,restart_addr-.(%r14) 872 br %r14 # branch to start_secondary 873restart_addr: 874 .long start_secondary 875 .align 8 876restart_vtime: 877 .long 0x7fffffff,0xffffffff 878 .previous 879#else 880/* 881 * If we do not run with SMP enabled, let the new CPU crash ... 882 */ 883 .globl restart_int_handler 884restart_int_handler: 885 basr %r1,0 886restart_base: 887 lpsw restart_crash-restart_base(%r1) 888 .align 8 889restart_crash: 890 .long 0x000a0000,0x00000000 891restart_go: 892#endif 893 894#ifdef CONFIG_CHECK_STACK 895/* 896 * The synchronous or the asynchronous stack overflowed. We are dead. 897 * No need to properly save the registers, we are going to panic anyway. 898 * Setup a pt_regs so that show_trace can provide a good call trace. 899 */ 900stack_overflow: 901 l %r15,__LC_PANIC_STACK # change to panic stack 902 sl %r15,BASED(.Lc_spsize) 903 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 904 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 905 la %r1,__LC_SAVE_AREA 906 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 907 be BASED(0f) 908 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 909 be BASED(0f) 910 la %r1,__LC_SAVE_AREA+16 9110: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 912 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 913 l %r1,BASED(1f) # branch to kernel_stack_overflow 914 la %r2,SP_PTREGS(%r15) # load pt_regs 915 br %r1 9161: .long kernel_stack_overflow 917#endif 918 919cleanup_table_system_call: 920 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 921cleanup_table_sysc_return: 922 .long sysc_return + 0x80000000, sysc_leave + 0x80000000 923cleanup_table_sysc_leave: 924 .long sysc_leave + 0x80000000, sysc_done + 0x80000000 925cleanup_table_sysc_work_loop: 926 .long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000 927cleanup_table_io_return: 928 .long io_return + 0x80000000, io_leave + 0x80000000 929cleanup_table_io_leave: 930 .long io_leave + 0x80000000, io_done + 0x80000000 931cleanup_table_io_work_loop: 932 .long io_work_loop + 0x80000000, io_work_done + 0x80000000 933 934cleanup_critical: 935 clc 4(4,%r12),BASED(cleanup_table_system_call) 936 bl BASED(0f) 937 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 938 bl BASED(cleanup_system_call) 9390: 940 clc 4(4,%r12),BASED(cleanup_table_sysc_return) 941 bl BASED(0f) 942 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) 943 bl BASED(cleanup_sysc_return) 9440: 945 clc 4(4,%r12),BASED(cleanup_table_sysc_leave) 946 bl BASED(0f) 947 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) 948 bl BASED(cleanup_sysc_leave) 9490: 950 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) 951 bl BASED(0f) 952 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) 953 bl BASED(cleanup_sysc_return) 9540: 955 clc 4(4,%r12),BASED(cleanup_table_io_return) 956 bl BASED(0f) 957 clc 4(4,%r12),BASED(cleanup_table_io_return+4) 958 bl BASED(cleanup_io_return) 9590: 960 clc 4(4,%r12),BASED(cleanup_table_io_leave) 961 bl BASED(0f) 962 clc 4(4,%r12),BASED(cleanup_table_io_leave+4) 963 bl BASED(cleanup_io_leave) 9640: 965 clc 4(4,%r12),BASED(cleanup_table_io_work_loop) 966 bl BASED(0f) 967 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) 968 bl BASED(cleanup_io_return) 9690: 970 br %r14 971 972cleanup_system_call: 973 mvc __LC_RETURN_PSW(8),0(%r12) 974 c %r12,BASED(.Lmck_old_psw) 975 be BASED(0f) 976 la %r12,__LC_SAVE_AREA+16 977 b BASED(1f) 9780: la %r12,__LC_SAVE_AREA+32 9791: 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 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 986 bh BASED(0f) 987 mvc __LC_SAVE_AREA(16),0(%r12) 9880: st %r13,4(%r12) 989 st %r12,__LC_SAVE_AREA+48 # argh 990 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 991 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 992 l %r12,__LC_SAVE_AREA+48 # argh 993 st %r15,12(%r12) 994 lh %r7,0x8a 995cleanup_vtime: 996 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 997 bhe BASED(cleanup_stime) 998 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 999cleanup_stime: 1000 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 1001 bh BASED(cleanup_update) 1002 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 1003cleanup_update: 1004 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 1005 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 1006 la %r12,__LC_RETURN_PSW 1007 br %r14 1008cleanup_system_call_insn: 1009 .long sysc_saveall + 0x80000000 1010 .long system_call + 0x80000000 1011 .long sysc_vtime + 0x80000000 1012 .long sysc_stime + 0x80000000 1013 .long sysc_update + 0x80000000 1014 1015cleanup_sysc_return: 1016 mvc __LC_RETURN_PSW(4),0(%r12) 1017 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) 1018 la %r12,__LC_RETURN_PSW 1019 br %r14 1020 1021cleanup_sysc_leave: 1022 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) 1023 be BASED(2f) 1024 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1025 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) 1026 be BASED(2f) 1027 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1028 c %r12,BASED(.Lmck_old_psw) 1029 bne BASED(0f) 1030 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1031 b BASED(1f) 10320: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10331: lm %r0,%r11,SP_R0(%r15) 1034 l %r15,SP_R15(%r15) 10352: la %r12,__LC_RETURN_PSW 1036 br %r14 1037cleanup_sysc_leave_insn: 1038 .long sysc_done - 4 + 0x80000000 1039 .long sysc_done - 8 + 0x80000000 1040 1041cleanup_io_return: 1042 mvc __LC_RETURN_PSW(4),0(%r12) 1043 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) 1044 la %r12,__LC_RETURN_PSW 1045 br %r14 1046 1047cleanup_io_leave: 1048 clc 4(4,%r12),BASED(cleanup_io_leave_insn) 1049 be BASED(2f) 1050 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 1051 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) 1052 be BASED(2f) 1053 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1054 c %r12,BASED(.Lmck_old_psw) 1055 bne BASED(0f) 1056 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1057 b BASED(1f) 10580: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) 10591: lm %r0,%r11,SP_R0(%r15) 1060 l %r15,SP_R15(%r15) 10612: la %r12,__LC_RETURN_PSW 1062 br %r14 1063cleanup_io_leave_insn: 1064 .long io_done - 4 + 0x80000000 1065 .long io_done - 8 + 0x80000000 1066 1067/* 1068 * Integer constants 1069 */ 1070 .align 4 1071.Lc_spsize: .long SP_SIZE 1072.Lc_overhead: .long STACK_FRAME_OVERHEAD 1073.Lnr_syscalls: .long NR_syscalls 1074.L0x018: .short 0x018 1075.L0x020: .short 0x020 1076.L0x028: .short 0x028 1077.L0x030: .short 0x030 1078.L0x038: .short 0x038 1079.Lc_1: .long 1 1080 1081/* 1082 * Symbol constants 1083 */ 1084.Ls390_mcck: .long s390_do_machine_check 1085.Ls390_handle_mcck: 1086 .long s390_handle_mcck 1087.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1088.Ldo_IRQ: .long do_IRQ 1089.Ldo_extint: .long do_extint 1090.Ldo_signal: .long do_signal 1091.Ldo_notify_resume: 1092 .long do_notify_resume 1093.Lhandle_per: .long do_single_step 1094.Ldo_execve: .long do_execve 1095.Lexecve_tail: .long execve_tail 1096.Ljump_table: .long pgm_check_table 1097.Lschedule: .long schedule 1098#ifdef CONFIG_PREEMPT 1099.Lpreempt_schedule_irq: 1100 .long preempt_schedule_irq 1101#endif 1102.Ltrace_entry: .long do_syscall_trace_enter 1103.Ltrace_exit: .long do_syscall_trace_exit 1104.Lschedtail: .long schedule_tail 1105.Lsysc_table: .long sys_call_table 1106#ifdef CONFIG_TRACE_IRQFLAGS 1107.Ltrace_irq_on_caller: 1108 .long trace_hardirqs_on_caller 1109.Ltrace_irq_off_caller: 1110 .long trace_hardirqs_off_caller 1111#endif 1112#ifdef CONFIG_LOCKDEP 1113.Llockdep_sys_exit: 1114 .long lockdep_sys_exit 1115#endif 1116.Lcritical_start: 1117 .long __critical_start + 0x80000000 1118.Lcritical_end: 1119 .long __critical_end + 0x80000000 1120.Lcleanup_critical: 1121 .long cleanup_critical 1122 1123 .section .rodata, "a" 1124#define SYSCALL(esa,esame,emu) .long esa 1125 .globl sys_call_table 1126sys_call_table: 1127#include "syscalls.S" 1128#undef SYSCALL 1129