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/init.h> 13#include <linux/linkage.h> 14#include <asm/cache.h> 15#include <asm/errno.h> 16#include <asm/ptrace.h> 17#include <asm/thread_info.h> 18#include <asm/asm-offsets.h> 19#include <asm/unistd.h> 20#include <asm/page.h> 21 22/* 23 * Stack layout for the system_call stack entry. 24 * The first few entries are identical to the user_regs_struct. 25 */ 26SP_PTREGS = STACK_FRAME_OVERHEAD 27SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS 28SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW 29SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS 30SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 31SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 32SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 33SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 34SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 35SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 36SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 37SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 38SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 39SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 40SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 41SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 42SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 43SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 44SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 45SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 46SP_SVC_CODE = STACK_FRAME_OVERHEAD + __PT_SVC_CODE 47SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE 48 49_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 50 _TIF_MCCK_PENDING | _TIF_PER_TRAP ) 51_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 52 _TIF_MCCK_PENDING) 53_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 54 _TIF_SYSCALL_TRACEPOINT) 55 56STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 57STACK_SIZE = 1 << STACK_SHIFT 58 59#define BASED(name) name-system_call(%r13) 60 61#ifdef CONFIG_TRACE_IRQFLAGS 62 .macro TRACE_IRQS_ON 63 basr %r2,%r0 64 l %r1,BASED(.Ltrace_irq_on_caller) 65 basr %r14,%r1 66 .endm 67 68 .macro TRACE_IRQS_OFF 69 basr %r2,%r0 70 l %r1,BASED(.Ltrace_irq_off_caller) 71 basr %r14,%r1 72 .endm 73#else 74#define TRACE_IRQS_ON 75#define TRACE_IRQS_OFF 76#endif 77 78#ifdef CONFIG_LOCKDEP 79 .macro LOCKDEP_SYS_EXIT 80 tm SP_PSW+1(%r15),0x01 # returning to user ? 81 jz 0f 82 l %r1,BASED(.Llockdep_sys_exit) 83 basr %r14,%r1 840: 85 .endm 86#else 87#define LOCKDEP_SYS_EXIT 88#endif 89 90/* 91 * Register usage in interrupt handlers: 92 * R9 - pointer to current task structure 93 * R13 - pointer to literal pool 94 * R14 - return register for function calls 95 * R15 - kernel stack pointer 96 */ 97 98 .macro UPDATE_VTIME lc_from,lc_to,lc_sum 99 lm %r10,%r11,\lc_from 100 sl %r10,\lc_to 101 sl %r11,\lc_to+4 102 bc 3,BASED(0f) 103 sl %r10,BASED(.Lc_1) 1040: al %r10,\lc_sum 105 al %r11,\lc_sum+4 106 bc 12,BASED(1f) 107 al %r10,BASED(.Lc_1) 1081: stm %r10,%r11,\lc_sum 109 .endm 110 111 .macro SAVE_ALL_SVC psworg,savearea 112 stm %r12,%r15,\savearea 113 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 114 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 115 s %r15,BASED(.Lc_spsize) # make room for registers & psw 116 .endm 117 118 .macro SAVE_ALL_BASE savearea 119 stm %r12,%r15,\savearea 120 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 121 .endm 122 123 .macro SAVE_ALL_PGM psworg,savearea 124 tm \psworg+1,0x01 # test problem state bit 125#ifdef CONFIG_CHECK_STACK 126 bnz BASED(1f) 127 tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 128 bnz BASED(2f) 129 la %r12,\psworg 130 b BASED(stack_overflow) 131#else 132 bz BASED(2f) 133#endif 1341: l %r15,__LC_KERNEL_STACK # problem state -> load ksp 1352: s %r15,BASED(.Lc_spsize) # make room for registers & psw 136 .endm 137 138 .macro SAVE_ALL_ASYNC psworg,savearea 139 stm %r12,%r15,\savearea 140 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 141 la %r12,\psworg 142 tm \psworg+1,0x01 # test problem state bit 143 bnz BASED(1f) # from user -> load async stack 144 clc \psworg+4(4),BASED(.Lcritical_end) 145 bhe BASED(0f) 146 clc \psworg+4(4),BASED(.Lcritical_start) 147 bl BASED(0f) 148 l %r14,BASED(.Lcleanup_critical) 149 basr %r14,%r14 150 tm 1(%r12),0x01 # retest problem state after cleanup 151 bnz BASED(1f) 1520: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? 153 slr %r14,%r15 154 sra %r14,STACK_SHIFT 155#ifdef CONFIG_CHECK_STACK 156 bnz BASED(1f) 157 tml %r15,STACK_SIZE - CONFIG_STACK_GUARD 158 bnz BASED(2f) 159 b BASED(stack_overflow) 160#else 161 bz BASED(2f) 162#endif 1631: l %r15,__LC_ASYNC_STACK 1642: s %r15,BASED(.Lc_spsize) # make room for registers & psw 165 .endm 166 167 .macro CREATE_STACK_FRAME savearea 168 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 169 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 170 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack 171 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 172 .endm 173 174 .macro RESTORE_ALL psworg,sync 175 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore 176 .if !\sync 177 ni \psworg+1,0xfd # clear wait state bit 178 .endif 179 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user 180 stpt __LC_EXIT_TIMER 181 lpsw \psworg # back to caller 182 .endm 183 184 .macro REENABLE_IRQS 185 mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) 186 ni __SF_EMPTY(%r15),0xbf 187 ssm __SF_EMPTY(%r15) 188 .endm 189 190 .section .kprobes.text, "ax" 191 192/* 193 * Scheduler resume function, called by switch_to 194 * gpr2 = (task_struct *) prev 195 * gpr3 = (task_struct *) next 196 * Returns: 197 * gpr2 = prev 198 */ 199ENTRY(__switch_to) 200 basr %r1,0 2010: l %r4,__THREAD_info(%r2) # get thread_info of prev 202 l %r5,__THREAD_info(%r3) # get thread_info of next 203 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? 204 bz 1f-0b(%r1) 205 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev 206 oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next 2071: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 208 st %r15,__THREAD_ksp(%r2) # store kernel stack of prev 209 l %r15,__THREAD_ksp(%r3) # load kernel stack of next 210 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 211 lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 212 st %r3,__LC_CURRENT # store task struct of next 213 mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next 214 st %r5,__LC_THREAD_INFO # store thread info of next 215 ahi %r5,STACK_SIZE # end of kernel stack of next 216 st %r5,__LC_KERNEL_STACK # store end of kernel stack 217 br %r14 218 219__critical_start: 220/* 221 * SVC interrupt handler routine. System calls are synchronous events and 222 * are executed with interrupts enabled. 223 */ 224 225ENTRY(system_call) 226 stpt __LC_SYNC_ENTER_TIMER 227sysc_saveall: 228 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 229 CREATE_STACK_FRAME __LC_SAVE_AREA 230 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 231 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 232 mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC 233 oi __TI_flags+3(%r12),_TIF_SYSCALL 234sysc_vtime: 235 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 236sysc_stime: 237 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 238sysc_update: 239 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 240sysc_do_svc: 241 xr %r7,%r7 242 icm %r7,3,SP_SVC_CODE+2(%r15)# load svc number and test for svc 0 243 bnz BASED(sysc_nr_ok) # svc number > 0 244 # svc 0: system call number in %r1 245 cl %r1,BASED(.Lnr_syscalls) 246 bnl BASED(sysc_nr_ok) 247 sth %r1,SP_SVC_CODE+2(%r15) 248 lr %r7,%r1 # copy svc number to %r7 249sysc_nr_ok: 250 sll %r7,2 # svc number *4 251 l %r10,BASED(.Lsysc_table) 252 tm __TI_flags+2(%r12),_TIF_TRACE >> 8 253 mvc SP_ARGS(4,%r15),SP_R7(%r15) 254 l %r8,0(%r7,%r10) # get system call addr. 255 bnz BASED(sysc_tracesys) 256 basr %r14,%r8 # call sys_xxxx 257 st %r2,SP_R2(%r15) # store return value (change R2 on stack) 258 259sysc_return: 260 LOCKDEP_SYS_EXIT 261sysc_tif: 262 tm SP_PSW+1(%r15),0x01 # returning to user ? 263 bno BASED(sysc_restore) 264 tm __TI_flags+3(%r12),_TIF_WORK_SVC 265 bnz BASED(sysc_work) # there is work to do (signals etc.) 266 ni __TI_flags+3(%r12),255-_TIF_SYSCALL 267sysc_restore: 268 RESTORE_ALL __LC_RETURN_PSW,1 269sysc_done: 270 271# 272# One of the work bits is on. Find out which one. 273# 274sysc_work: 275 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 276 bo BASED(sysc_mcck_pending) 277 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 278 bo BASED(sysc_reschedule) 279 tm __TI_flags+3(%r12),_TIF_SIGPENDING 280 bo BASED(sysc_sigpending) 281 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 282 bo BASED(sysc_notify_resume) 283 tm __TI_flags+3(%r12),_TIF_PER_TRAP 284 bo BASED(sysc_singlestep) 285 b BASED(sysc_return) # beware of critical section cleanup 286 287# 288# _TIF_NEED_RESCHED is set, call schedule 289# 290sysc_reschedule: 291 l %r1,BASED(.Lschedule) 292 la %r14,BASED(sysc_return) 293 br %r1 # call scheduler 294 295# 296# _TIF_MCCK_PENDING is set, call handler 297# 298sysc_mcck_pending: 299 l %r1,BASED(.Ls390_handle_mcck) 300 la %r14,BASED(sysc_return) 301 br %r1 # TIF bit will be cleared by handler 302 303# 304# _TIF_SIGPENDING is set, call do_signal 305# 306sysc_sigpending: 307 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP 308 la %r2,SP_PTREGS(%r15) # load pt_regs 309 l %r1,BASED(.Ldo_signal) 310 basr %r14,%r1 # call do_signal 311 tm __TI_flags+3(%r12),_TIF_SYSCALL 312 bno BASED(sysc_return) 313 lm %r2,%r6,SP_R2(%r15) # load svc arguments 314 xr %r7,%r7 # svc 0 returns -ENOSYS 315 clc SP_SVC_CODE+2(2,%r15),BASED(.Lnr_syscalls+2) 316 bnl BASED(sysc_nr_ok) # invalid svc number -> do svc 0 317 icm %r7,3,SP_SVC_CODE+2(%r15)# load new svc number 318 b BASED(sysc_nr_ok) # restart svc 319 320# 321# _TIF_NOTIFY_RESUME is set, call do_notify_resume 322# 323sysc_notify_resume: 324 la %r2,SP_PTREGS(%r15) # load pt_regs 325 l %r1,BASED(.Ldo_notify_resume) 326 la %r14,BASED(sysc_return) 327 br %r1 # call do_notify_resume 328 329# 330# _TIF_PER_TRAP is set, call do_per_trap 331# 332sysc_singlestep: 333 ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) 334 la %r2,SP_PTREGS(%r15) # address of register-save area 335 l %r1,BASED(.Lhandle_per) # load adr. of per handler 336 la %r14,BASED(sysc_return) # load adr. of system return 337 br %r1 # branch to do_per_trap 338 339# 340# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 341# and after the system call 342# 343sysc_tracesys: 344 l %r1,BASED(.Ltrace_entry) 345 la %r2,SP_PTREGS(%r15) # load pt_regs 346 la %r3,0 347 xr %r0,%r0 348 icm %r0,3,SP_SVC_CODE(%r15) 349 st %r0,SP_R2(%r15) 350 basr %r14,%r1 351 cl %r2,BASED(.Lnr_syscalls) 352 bnl BASED(sysc_tracenogo) 353 lr %r7,%r2 354 sll %r7,2 # svc number *4 355 l %r8,0(%r7,%r10) 356sysc_tracego: 357 lm %r3,%r6,SP_R3(%r15) 358 mvc SP_ARGS(4,%r15),SP_R7(%r15) 359 l %r2,SP_ORIG_R2(%r15) 360 basr %r14,%r8 # call sys_xxx 361 st %r2,SP_R2(%r15) # store return value 362sysc_tracenogo: 363 tm __TI_flags+2(%r12),_TIF_TRACE >> 8 364 bz BASED(sysc_return) 365 l %r1,BASED(.Ltrace_exit) 366 la %r2,SP_PTREGS(%r15) # load pt_regs 367 la %r14,BASED(sysc_return) 368 br %r1 369 370# 371# a new process exits the kernel with ret_from_fork 372# 373ENTRY(ret_from_fork) 374 l %r13,__LC_SVC_NEW_PSW+4 375 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 376 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? 377 bo BASED(0f) 378 st %r15,SP_R15(%r15) # store stack pointer for new kthread 3790: l %r1,BASED(.Lschedtail) 380 basr %r14,%r1 381 TRACE_IRQS_ON 382 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 383 b BASED(sysc_tracenogo) 384 385# 386# kernel_execve function needs to deal with pt_regs that is not 387# at the usual place 388# 389ENTRY(kernel_execve) 390 stm %r12,%r15,48(%r15) 391 lr %r14,%r15 392 l %r13,__LC_SVC_NEW_PSW+4 393 s %r15,BASED(.Lc_spsize) 394 st %r14,__SF_BACKCHAIN(%r15) 395 la %r12,SP_PTREGS(%r15) 396 xc 0(__PT_SIZE,%r12),0(%r12) 397 l %r1,BASED(.Ldo_execve) 398 lr %r5,%r12 399 basr %r14,%r1 400 ltr %r2,%r2 401 be BASED(0f) 402 a %r15,BASED(.Lc_spsize) 403 lm %r12,%r15,48(%r15) 404 br %r14 405 # execve succeeded. 4060: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts 407 l %r15,__LC_KERNEL_STACK # load ksp 408 s %r15,BASED(.Lc_spsize) # make room for registers & psw 409 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs 410 l %r12,__LC_THREAD_INFO 411 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) 412 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 413 l %r1,BASED(.Lexecve_tail) 414 basr %r14,%r1 415 b BASED(sysc_return) 416 417/* 418 * Program check handler routine 419 */ 420 421ENTRY(pgm_check_handler) 422/* 423 * First we need to check for a special case: 424 * Single stepping an instruction that disables the PER event mask will 425 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. 426 * For a single stepped SVC the program check handler gets control after 427 * the SVC new PSW has been loaded. But we want to execute the SVC first and 428 * then handle the PER event. Therefore we update the SVC old PSW to point 429 * to the pgm_check_handler and branch to the SVC handler after we checked 430 * if we have to load the kernel stack register. 431 * For every other possible cause for PER event without the PER mask set 432 * we just ignore the PER event (FIXME: is there anything we have to do 433 * for LPSW?). 434 */ 435 stpt __LC_SYNC_ENTER_TIMER 436 SAVE_ALL_BASE __LC_SAVE_AREA 437 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception 438 bnz BASED(pgm_per) # got per exception -> special case 439 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 440 CREATE_STACK_FRAME __LC_SAVE_AREA 441 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 442 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 443 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 444 bz BASED(pgm_no_vtime) 445 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 446 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 447 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 448pgm_no_vtime: 449 l %r3,__LC_PGM_ILC # load program interruption code 450 l %r4,__LC_TRANS_EXC_CODE 451 REENABLE_IRQS 452 la %r8,0x7f 453 nr %r8,%r3 454 sll %r8,2 455 l %r1,BASED(.Ljump_table) 456 l %r1,0(%r8,%r1) # load address of handler routine 457 la %r2,SP_PTREGS(%r15) # address of register-save area 458 basr %r14,%r1 # branch to interrupt-handler 459pgm_exit: 460 b BASED(sysc_return) 461 462# 463# handle per exception 464# 465pgm_per: 466 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on 467 bnz BASED(pgm_per_std) # ok, normal per event from user space 468# ok its one of the special cases, now we need to find out which one 469 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW 470 be BASED(pgm_svcper) 471# no interesting special case, ignore PER event 472 lm %r12,%r15,__LC_SAVE_AREA 473 lpsw 0x28 474 475# 476# Normal per exception 477# 478pgm_per_std: 479 SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA 480 CREATE_STACK_FRAME __LC_SAVE_AREA 481 mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW 482 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 483 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 484 bz BASED(pgm_no_vtime2) 485 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 486 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 487 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 488pgm_no_vtime2: 489 l %r1,__TI_task(%r12) 490 tm SP_PSW+1(%r15),0x01 # kernel per event ? 491 bz BASED(kernel_per) 492 mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE 493 mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS 494 mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID 495 oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP 496 l %r3,__LC_PGM_ILC # load program interruption code 497 l %r4,__LC_TRANS_EXC_CODE 498 REENABLE_IRQS 499 la %r8,0x7f 500 nr %r8,%r3 # clear per-event-bit and ilc 501 be BASED(pgm_exit2) # only per or per+check ? 502 sll %r8,2 503 l %r1,BASED(.Ljump_table) 504 l %r1,0(%r8,%r1) # load address of handler routine 505 la %r2,SP_PTREGS(%r15) # address of register-save area 506 basr %r14,%r1 # branch to interrupt-handler 507pgm_exit2: 508 b BASED(sysc_return) 509 510# 511# it was a single stepped SVC that is causing all the trouble 512# 513pgm_svcper: 514 SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA 515 CREATE_STACK_FRAME __LC_SAVE_AREA 516 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 517 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 518 mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC 519 oi __TI_flags+3(%r12),(_TIF_SYSCALL | _TIF_PER_TRAP) 520 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 521 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 522 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 523 l %r8,__TI_task(%r12) 524 mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE 525 mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS 526 mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID 527 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 528 lm %r2,%r6,SP_R2(%r15) # load svc arguments 529 b BASED(sysc_do_svc) 530 531# 532# per was called from kernel, must be kprobes 533# 534kernel_per: 535 REENABLE_IRQS 536 la %r2,SP_PTREGS(%r15) # address of register-save area 537 l %r1,BASED(.Lhandle_per) # load adr. of per handler 538 basr %r14,%r1 # branch to do_single_step 539 b BASED(pgm_exit) 540 541/* 542 * IO interrupt handler routine 543 */ 544 545ENTRY(io_int_handler) 546 stck __LC_INT_CLOCK 547 stpt __LC_ASYNC_ENTER_TIMER 548 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 549 CREATE_STACK_FRAME __LC_SAVE_AREA+16 550 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 551 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 552 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 553 bz BASED(io_no_vtime) 554 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 555 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 556 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 557io_no_vtime: 558 TRACE_IRQS_OFF 559 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ 560 la %r2,SP_PTREGS(%r15) # address of register-save area 561 basr %r14,%r1 # branch to standard irq handler 562io_return: 563 LOCKDEP_SYS_EXIT 564 TRACE_IRQS_ON 565io_tif: 566 tm __TI_flags+3(%r12),_TIF_WORK_INT 567 bnz BASED(io_work) # there is work to do (signals etc.) 568io_restore: 569 RESTORE_ALL __LC_RETURN_PSW,0 570io_done: 571 572# 573# There is work todo, find out in which context we have been interrupted: 574# 1) if we return to user space we can do all _TIF_WORK_INT work 575# 2) if we return to kernel code and preemptive scheduling is enabled check 576# the preemption counter and if it is zero call preempt_schedule_irq 577# Before any work can be done, a switch to the kernel stack is required. 578# 579io_work: 580 tm SP_PSW+1(%r15),0x01 # returning to user ? 581 bo BASED(io_work_user) # yes -> do resched & signal 582#ifdef CONFIG_PREEMPT 583 # check for preemptive scheduling 584 icm %r0,15,__TI_precount(%r12) 585 bnz BASED(io_restore) # preemption disabled 586 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 587 bno BASED(io_restore) 588 # switch to kernel stack 589 l %r1,SP_R15(%r15) 590 s %r1,BASED(.Lc_spsize) 591 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 592 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 593 lr %r15,%r1 594 # TRACE_IRQS_ON already done at io_return, call 595 # TRACE_IRQS_OFF to keep things symmetrical 596 TRACE_IRQS_OFF 597 l %r1,BASED(.Lpreempt_schedule_irq) 598 basr %r14,%r1 # call preempt_schedule_irq 599 b BASED(io_return) 600#else 601 b BASED(io_restore) 602#endif 603 604# 605# Need to do work before returning to userspace, switch to kernel stack 606# 607io_work_user: 608 l %r1,__LC_KERNEL_STACK 609 s %r1,BASED(.Lc_spsize) 610 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 611 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 612 lr %r15,%r1 613 614# 615# One of the work bits is on. Find out which one. 616# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED 617# and _TIF_MCCK_PENDING 618# 619io_work_tif: 620 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 621 bo BASED(io_mcck_pending) 622 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED 623 bo BASED(io_reschedule) 624 tm __TI_flags+3(%r12),_TIF_SIGPENDING 625 bo BASED(io_sigpending) 626 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME 627 bo BASED(io_notify_resume) 628 b BASED(io_return) # beware of critical section cleanup 629 630# 631# _TIF_MCCK_PENDING is set, call handler 632# 633io_mcck_pending: 634 # TRACE_IRQS_ON already done at io_return 635 l %r1,BASED(.Ls390_handle_mcck) 636 basr %r14,%r1 # TIF bit will be cleared by handler 637 TRACE_IRQS_OFF 638 b BASED(io_return) 639 640# 641# _TIF_NEED_RESCHED is set, call schedule 642# 643io_reschedule: 644 # TRACE_IRQS_ON already done at io_return 645 l %r1,BASED(.Lschedule) 646 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 647 basr %r14,%r1 # call scheduler 648 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 649 TRACE_IRQS_OFF 650 b BASED(io_return) 651 652# 653# _TIF_SIGPENDING is set, call do_signal 654# 655io_sigpending: 656 # TRACE_IRQS_ON already done at io_return 657 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 658 la %r2,SP_PTREGS(%r15) # load pt_regs 659 l %r1,BASED(.Ldo_signal) 660 basr %r14,%r1 # call do_signal 661 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 662 TRACE_IRQS_OFF 663 b BASED(io_return) 664 665# 666# _TIF_SIGPENDING is set, call do_signal 667# 668io_notify_resume: 669 # TRACE_IRQS_ON already done at io_return 670 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts 671 la %r2,SP_PTREGS(%r15) # load pt_regs 672 l %r1,BASED(.Ldo_notify_resume) 673 basr %r14,%r1 # call do_signal 674 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts 675 TRACE_IRQS_OFF 676 b BASED(io_return) 677 678/* 679 * External interrupt handler routine 680 */ 681 682ENTRY(ext_int_handler) 683 stck __LC_INT_CLOCK 684 stpt __LC_ASYNC_ENTER_TIMER 685 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 686 CREATE_STACK_FRAME __LC_SAVE_AREA+16 687 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 688 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 689 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 690 bz BASED(ext_no_vtime) 691 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER 692 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 693 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER 694ext_no_vtime: 695 TRACE_IRQS_OFF 696 la %r2,SP_PTREGS(%r15) # address of register-save area 697 l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code 698 l %r4,__LC_EXT_PARAMS # get external parameters 699 l %r1,BASED(.Ldo_extint) 700 basr %r14,%r1 701 b BASED(io_return) 702 703__critical_end: 704 705/* 706 * Machine check handler routines 707 */ 708 709ENTRY(mcck_int_handler) 710 stck __LC_MCCK_CLOCK 711 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer 712 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs 713 SAVE_ALL_BASE __LC_SAVE_AREA+32 714 la %r12,__LC_MCK_OLD_PSW 715 tm __LC_MCCK_CODE,0x80 # system damage? 716 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid 717 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA 718 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 719 bo BASED(1f) 720 la %r14,__LC_SYNC_ENTER_TIMER 721 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 722 bl BASED(0f) 723 la %r14,__LC_ASYNC_ENTER_TIMER 7240: clc 0(8,%r14),__LC_EXIT_TIMER 725 bl BASED(0f) 726 la %r14,__LC_EXIT_TIMER 7270: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 728 bl BASED(0f) 729 la %r14,__LC_LAST_UPDATE_TIMER 7300: spt 0(%r14) 731 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7321: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 733 bno BASED(mcck_int_main) # no -> skip cleanup critical 734 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit 735 bnz BASED(mcck_int_main) # from user -> load async stack 736 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) 737 bhe BASED(mcck_int_main) 738 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) 739 bl BASED(mcck_int_main) 740 l %r14,BASED(.Lcleanup_critical) 741 basr %r14,%r14 742mcck_int_main: 743 l %r14,__LC_PANIC_STACK # are we already on the panic stack? 744 slr %r14,%r15 745 sra %r14,PAGE_SHIFT 746 be BASED(0f) 747 l %r15,__LC_PANIC_STACK # load panic stack 7480: s %r15,BASED(.Lc_spsize) # make room for registers & psw 749 CREATE_STACK_FRAME __LC_SAVE_AREA+32 750 mvc SP_PSW(8,%r15),0(%r12) 751 l %r12,__LC_THREAD_INFO # load pointer to thread_info struct 752 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? 753 bno BASED(mcck_no_vtime) # no -> skip cleanup critical 754 tm SP_PSW+1(%r15),0x01 # interrupting from user ? 755 bz BASED(mcck_no_vtime) 756 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER 757 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 758 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER 759mcck_no_vtime: 760 la %r2,SP_PTREGS(%r15) # load pt_regs 761 l %r1,BASED(.Ls390_mcck) 762 basr %r14,%r1 # call machine check handler 763 tm SP_PSW+1(%r15),0x01 # returning to user ? 764 bno BASED(mcck_return) 765 l %r1,__LC_KERNEL_STACK # switch to kernel stack 766 s %r1,BASED(.Lc_spsize) 767 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) 768 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain 769 lr %r15,%r1 770 stosm __SF_EMPTY(%r15),0x04 # turn dat on 771 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING 772 bno BASED(mcck_return) 773 TRACE_IRQS_OFF 774 l %r1,BASED(.Ls390_handle_mcck) 775 basr %r14,%r1 # call machine check handler 776 TRACE_IRQS_ON 777mcck_return: 778 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW 779 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit 780 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 781 bno BASED(0f) 782 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 783 stpt __LC_EXIT_TIMER 784 lpsw __LC_RETURN_MCCK_PSW # back to caller 7850: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 786 lpsw __LC_RETURN_MCCK_PSW # back to caller 787 788 RESTORE_ALL __LC_RETURN_MCCK_PSW,0 789 790/* 791 * Restart interruption handler, kick starter for additional CPUs 792 */ 793#ifdef CONFIG_SMP 794 __CPUINIT 795ENTRY(restart_int_handler) 796 basr %r1,0 797restart_base: 798 spt restart_vtime-restart_base(%r1) 799 stck __LC_LAST_UPDATE_CLOCK 800 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) 801 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) 802 l %r15,__LC_SAVE_AREA+60 # load ksp 803 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs 804 lam %a0,%a15,__LC_AREGS_SAVE_AREA 805 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone 806 l %r1,__LC_THREAD_INFO 807 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) 808 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) 809 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER 810 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on 811 basr %r14,0 812 l %r14,restart_addr-.(%r14) 813 basr %r14,%r14 # branch to start_secondary 814restart_addr: 815 .long start_secondary 816 .align 8 817restart_vtime: 818 .long 0x7fffffff,0xffffffff 819 .previous 820#else 821/* 822 * If we do not run with SMP enabled, let the new CPU crash ... 823 */ 824ENTRY(restart_int_handler) 825 basr %r1,0 826restart_base: 827 lpsw restart_crash-restart_base(%r1) 828 .align 8 829restart_crash: 830 .long 0x000a0000,0x00000000 831restart_go: 832#endif 833 834# 835# PSW restart interrupt handler 836# 837ENTRY(psw_restart_int_handler) 838 st %r15,__LC_SAVE_AREA+48(%r0) # save r15 839 basr %r15,0 8400: l %r15,.Lrestart_stack-0b(%r15) # load restart stack 841 l %r15,0(%r15) 842 ahi %r15,-SP_SIZE # make room for pt_regs 843 stm %r0,%r14,SP_R0(%r15) # store gprs %r0-%r14 to stack 844 mvc SP_R15(4,%r15),__LC_SAVE_AREA+48(%r0)# store saved %r15 to stack 845 mvc SP_PSW(8,%r15),__LC_RST_OLD_PSW(%r0) # store restart old psw 846 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0 847 basr %r14,0 8481: l %r14,.Ldo_restart-1b(%r14) 849 basr %r14,%r14 850 851 basr %r14,0 # load disabled wait PSW if 8522: lpsw restart_psw_crash-2b(%r14) # do_restart returns 853 .align 4 854.Ldo_restart: 855 .long do_restart 856.Lrestart_stack: 857 .long restart_stack 858 .align 8 859restart_psw_crash: 860 .long 0x000a0000,0x00000000 + restart_psw_crash 861 862 .section .kprobes.text, "ax" 863 864#ifdef CONFIG_CHECK_STACK 865/* 866 * The synchronous or the asynchronous stack overflowed. We are dead. 867 * No need to properly save the registers, we are going to panic anyway. 868 * Setup a pt_regs so that show_trace can provide a good call trace. 869 */ 870stack_overflow: 871 l %r15,__LC_PANIC_STACK # change to panic stack 872 sl %r15,BASED(.Lc_spsize) 873 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack 874 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack 875 la %r1,__LC_SAVE_AREA 876 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? 877 be BASED(0f) 878 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? 879 be BASED(0f) 880 la %r1,__LC_SAVE_AREA+16 8810: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack 882 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain 883 l %r1,BASED(1f) # branch to kernel_stack_overflow 884 la %r2,SP_PTREGS(%r15) # load pt_regs 885 br %r1 8861: .long kernel_stack_overflow 887#endif 888 889cleanup_table_system_call: 890 .long system_call + 0x80000000, sysc_do_svc + 0x80000000 891cleanup_table_sysc_tif: 892 .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 893cleanup_table_sysc_restore: 894 .long sysc_restore + 0x80000000, sysc_done + 0x80000000 895cleanup_table_io_tif: 896 .long io_tif + 0x80000000, io_restore + 0x80000000 897cleanup_table_io_restore: 898 .long io_restore + 0x80000000, io_done + 0x80000000 899 900cleanup_critical: 901 clc 4(4,%r12),BASED(cleanup_table_system_call) 902 bl BASED(0f) 903 clc 4(4,%r12),BASED(cleanup_table_system_call+4) 904 bl BASED(cleanup_system_call) 9050: 906 clc 4(4,%r12),BASED(cleanup_table_sysc_tif) 907 bl BASED(0f) 908 clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) 909 bl BASED(cleanup_sysc_tif) 9100: 911 clc 4(4,%r12),BASED(cleanup_table_sysc_restore) 912 bl BASED(0f) 913 clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) 914 bl BASED(cleanup_sysc_restore) 9150: 916 clc 4(4,%r12),BASED(cleanup_table_io_tif) 917 bl BASED(0f) 918 clc 4(4,%r12),BASED(cleanup_table_io_tif+4) 919 bl BASED(cleanup_io_tif) 9200: 921 clc 4(4,%r12),BASED(cleanup_table_io_restore) 922 bl BASED(0f) 923 clc 4(4,%r12),BASED(cleanup_table_io_restore+4) 924 bl BASED(cleanup_io_restore) 9250: 926 br %r14 927 928cleanup_system_call: 929 mvc __LC_RETURN_PSW(8),0(%r12) 930 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) 931 bh BASED(0f) 932 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 933 c %r12,BASED(.Lmck_old_psw) 934 be BASED(0f) 935 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 9360: c %r12,BASED(.Lmck_old_psw) 937 la %r12,__LC_SAVE_AREA+32 938 be BASED(0f) 939 la %r12,__LC_SAVE_AREA+16 9400: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) 941 bhe BASED(cleanup_vtime) 942 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) 943 bh BASED(0f) 944 mvc __LC_SAVE_AREA(16),0(%r12) 9450: st %r13,4(%r12) 946 l %r15,__LC_KERNEL_STACK # problem state -> load ksp 947 s %r15,BASED(.Lc_spsize) # make room for registers & psw 948 st %r15,12(%r12) 949 CREATE_STACK_FRAME __LC_SAVE_AREA 950 mvc 0(4,%r12),__LC_THREAD_INFO 951 l %r12,__LC_THREAD_INFO 952 mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW 953 mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC 954 oi __TI_flags+3(%r12),_TIF_SYSCALL 955cleanup_vtime: 956 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) 957 bhe BASED(cleanup_stime) 958 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER 959cleanup_stime: 960 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) 961 bh BASED(cleanup_update) 962 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER 963cleanup_update: 964 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 965 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) 966 la %r12,__LC_RETURN_PSW 967 br %r14 968cleanup_system_call_insn: 969 .long sysc_saveall + 0x80000000 970 .long system_call + 0x80000000 971 .long sysc_vtime + 0x80000000 972 .long sysc_stime + 0x80000000 973 .long sysc_update + 0x80000000 974 975cleanup_sysc_tif: 976 mvc __LC_RETURN_PSW(4),0(%r12) 977 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) 978 la %r12,__LC_RETURN_PSW 979 br %r14 980 981cleanup_sysc_restore: 982 clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) 983 be BASED(2f) 984 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 985 c %r12,BASED(.Lmck_old_psw) 986 be BASED(0f) 987 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 9880: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) 989 be BASED(2f) 990 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 991 c %r12,BASED(.Lmck_old_psw) 992 la %r12,__LC_SAVE_AREA+32 993 be BASED(1f) 994 la %r12,__LC_SAVE_AREA+16 9951: mvc 0(16,%r12),SP_R12(%r15) 996 lm %r0,%r11,SP_R0(%r15) 997 l %r15,SP_R15(%r15) 9982: la %r12,__LC_RETURN_PSW 999 br %r14 1000cleanup_sysc_restore_insn: 1001 .long sysc_done - 4 + 0x80000000 1002 .long sysc_done - 8 + 0x80000000 1003 1004cleanup_io_tif: 1005 mvc __LC_RETURN_PSW(4),0(%r12) 1006 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) 1007 la %r12,__LC_RETURN_PSW 1008 br %r14 1009 1010cleanup_io_restore: 1011 clc 4(4,%r12),BASED(cleanup_io_restore_insn) 1012 be BASED(1f) 1013 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 1014 clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) 1015 be BASED(1f) 1016 mvc __LC_RETURN_PSW(8),SP_PSW(%r15) 1017 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) 1018 lm %r0,%r11,SP_R0(%r15) 1019 l %r15,SP_R15(%r15) 10201: la %r12,__LC_RETURN_PSW 1021 br %r14 1022cleanup_io_restore_insn: 1023 .long io_done - 4 + 0x80000000 1024 .long io_done - 8 + 0x80000000 1025 1026/* 1027 * Integer constants 1028 */ 1029 .align 4 1030.Lc_spsize: .long SP_SIZE 1031.Lc_overhead: .long STACK_FRAME_OVERHEAD 1032.Lnr_syscalls: .long NR_syscalls 1033.L0x018: .short 0x018 1034.L0x020: .short 0x020 1035.L0x028: .short 0x028 1036.L0x030: .short 0x030 1037.L0x038: .short 0x038 1038.Lc_1: .long 1 1039 1040/* 1041 * Symbol constants 1042 */ 1043.Ls390_mcck: .long s390_do_machine_check 1044.Ls390_handle_mcck: 1045 .long s390_handle_mcck 1046.Lmck_old_psw: .long __LC_MCK_OLD_PSW 1047.Ldo_IRQ: .long do_IRQ 1048.Ldo_extint: .long do_extint 1049.Ldo_signal: .long do_signal 1050.Ldo_notify_resume: 1051 .long do_notify_resume 1052.Lhandle_per: .long do_per_trap 1053.Ldo_execve: .long do_execve 1054.Lexecve_tail: .long execve_tail 1055.Ljump_table: .long pgm_check_table 1056.Lschedule: .long schedule 1057#ifdef CONFIG_PREEMPT 1058.Lpreempt_schedule_irq: 1059 .long preempt_schedule_irq 1060#endif 1061.Ltrace_entry: .long do_syscall_trace_enter 1062.Ltrace_exit: .long do_syscall_trace_exit 1063.Lschedtail: .long schedule_tail 1064.Lsysc_table: .long sys_call_table 1065#ifdef CONFIG_TRACE_IRQFLAGS 1066.Ltrace_irq_on_caller: 1067 .long trace_hardirqs_on_caller 1068.Ltrace_irq_off_caller: 1069 .long trace_hardirqs_off_caller 1070#endif 1071#ifdef CONFIG_LOCKDEP 1072.Llockdep_sys_exit: 1073 .long lockdep_sys_exit 1074#endif 1075.Lcritical_start: 1076 .long __critical_start + 0x80000000 1077.Lcritical_end: 1078 .long __critical_end + 0x80000000 1079.Lcleanup_critical: 1080 .long cleanup_critical 1081 1082 .section .rodata, "a" 1083#define SYSCALL(esa,esame,emu) .long esa 1084 .globl sys_call_table 1085sys_call_table: 1086#include "syscalls.S" 1087#undef SYSCALL 1088