arch/s390/kernel/entry.S

   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  */
  28 SP_PTREGS    =  STACK_FRAME_OVERHEAD
  29 SP_ARGS      =  STACK_FRAME_OVERHEAD + __PT_ARGS
  30 SP_PSW       =  STACK_FRAME_OVERHEAD + __PT_PSW
  31 SP_R0        =  STACK_FRAME_OVERHEAD + __PT_GPRS
  32 SP_R1        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 4
  33 SP_R2        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 8
  34 SP_R3        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 12
  35 SP_R4        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 16
  36 SP_R5        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 20
  37 SP_R6        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 24
  38 SP_R7        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 28
  39 SP_R8        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 32
  40 SP_R9        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 36
  41 SP_R10       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 40
  42 SP_R11       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 44
  43 SP_R12       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 48
  44 SP_R13       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 52
  45 SP_R14       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 56
  46 SP_R15       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 60
  47 SP_ORIG_R2   =  STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
  48 SP_ILC       =  STACK_FRAME_OVERHEAD + __PT_ILC
  49 SP_TRAP      =  STACK_FRAME_OVERHEAD + __PT_TRAP
  50 SP_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
  57 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
  58 STACK_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
  82 0:      l       %r1,BASED(.Ltrace_irq_off_caller)
  83         basr    %r14,%r1
  84 1:
  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
  98 0:
  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)
 125 0:      al      %r10,\lc_sum
 126         al      %r11,\lc_sum+4
 127         bc      12,BASED(1f)
 128         al      %r10,BASED(.Lc_1)
 129 1:      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)
 150 2:      tml     %r15,STACK_SIZE - CONFIG_STACK_GUARD
 151         bz      BASED(stack_overflow)
 152 3:
 153 #endif
 154 2:
 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)
 169 0:      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)
 173 1:      l       %r15,__LC_ASYNC_STACK
 174 #ifdef CONFIG_CHECK_STACK
 175         b       BASED(3f)
 176 2:      tml     %r15,STACK_SIZE - CONFIG_STACK_GUARD
 177         bz      BASED(stack_overflow)
 178 3:
 179 #endif
 180 2:
 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         la      %r12,\psworg
 187         st      %r2,SP_ORIG_R2(%r15)    # store original content of gpr 2
 188         icm     %r12,12,__LC_SVC_ILC
 189         stm     %r0,%r11,SP_R0(%r15)    # store gprs %r0-%r11 to kernel stack
 190         st      %r12,SP_ILC(%r15)
 191         mvc     SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
 192         la      %r12,0
 193         st      %r12,__SF_BACKCHAIN(%r15)       # clear back chain
 194         .endm
 195
 196         .macro  RESTORE_ALL psworg,sync
 197         mvc     \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
 198         .if !\sync
 199         ni      \psworg+1,0xfd          # clear wait state bit
 200         .endif
 201         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15 of user
 202         STORE_TIMER __LC_EXIT_TIMER
 203         lpsw    \psworg                 # back to caller
 204         .endm
 205
 206 /*
 207  * Scheduler resume function, called by switch_to
 208  *  gpr2 = (task_struct *) prev
 209  *  gpr3 = (task_struct *) next
 210  * Returns:
 211  *  gpr2 = prev
 212  */
 213         .globl  __switch_to
 214 __switch_to:
 215         basr    %r1,0
 216 __switch_to_base:
 217         tm      __THREAD_per(%r3),0xe8          # new process is using per ?
 218         bz      __switch_to_noper-__switch_to_base(%r1) # if not we're fine
 219         stctl   %c9,%c11,__SF_EMPTY(%r15)       # We are using per stuff
 220         clc     __THREAD_per(12,%r3),__SF_EMPTY(%r15)
 221         be      __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
 222         lctl    %c9,%c11,__THREAD_per(%r3)      # Nope we didn't
 223 __switch_to_noper:
 224         l       %r4,__THREAD_info(%r2)          # get thread_info of prev
 225         tm      __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
 226         bz      __switch_to_no_mcck-__switch_to_base(%r1)
 227         ni      __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
 228         l       %r4,__THREAD_info(%r3)          # get thread_info of next
 229         oi      __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
 230 __switch_to_no_mcck:
 231         stm     %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
 232         st      %r15,__THREAD_ksp(%r2)  # store kernel stack to prev->tss.ksp
 233         l       %r15,__THREAD_ksp(%r3)  # load kernel stack from next->tss.ksp
 234         lm      %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
 235         st      %r3,__LC_CURRENT        # __LC_CURRENT = current task struct
 236         lctl    %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
 237         l       %r3,__THREAD_info(%r3)  # load thread_info from task struct
 238         st      %r3,__LC_THREAD_INFO
 239         ahi     %r3,STACK_SIZE
 240         st      %r3,__LC_KERNEL_STACK   # __LC_KERNEL_STACK = new kernel stack
 241         br      %r14
 242
 243 __critical_start:
 244 /*
 245  * SVC interrupt handler routine. System calls are synchronous events and
 246  * are executed with interrupts enabled.
 247  */
 248
 249         .globl  system_call
 250 system_call:
 251         STORE_TIMER __LC_SYNC_ENTER_TIMER
 252 sysc_saveall:
 253         SAVE_ALL_BASE __LC_SAVE_AREA
 254         SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 255         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 256         lh      %r7,0x8a          # get svc number from lowcore
 257 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 258 sysc_vtime:
 259         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 260 sysc_stime:
 261         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 262 sysc_update:
 263         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
 264 #endif
 265 sysc_do_svc:
 266         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 267         sla     %r7,2                   # *4 and test for svc 0
 268         bnz     BASED(sysc_nr_ok)       # svc number > 0
 269         # svc 0: system call number in %r1
 270         cl      %r1,BASED(.Lnr_syscalls)
 271         bnl     BASED(sysc_nr_ok)
 272         lr      %r7,%r1           # copy svc number to %r7
 273         sla     %r7,2             # *4
 274 sysc_nr_ok:
 275         mvc     SP_ARGS(4,%r15),SP_R7(%r15)
 276 sysc_do_restart:
 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
 284 sysc_return:
 285         tm      __TI_flags+3(%r9),_TIF_WORK_SVC
 286         bnz     BASED(sysc_work)  # there is work to do (signals etc.)
 287 sysc_restore:
 288 #ifdef CONFIG_TRACE_IRQFLAGS
 289         la      %r1,BASED(sysc_restore_trace_psw)
 290         lpsw    0(%r1)
 291 sysc_restore_trace:
 292         TRACE_IRQS_CHECK
 293         LOCKDEP_SYS_EXIT
 294 #endif
 295 sysc_leave:
 296         RESTORE_ALL __LC_RETURN_PSW,1
 297 sysc_done:
 298
 299 #ifdef CONFIG_TRACE_IRQFLAGS
 300         .align  8
 301         .globl  sysc_restore_trace_psw
 302 sysc_restore_trace_psw:
 303         .long   0, sysc_restore_trace + 0x80000000
 304 #endif
 305
 306 #
 307 # recheck if there is more work to do
 308 #
 309 sysc_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 #
 315 sysc_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)
 331 sysc_work_done:
 332
 333 #
 334 # _TIF_NEED_RESCHED is set, call schedule
 335 #
 336 sysc_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 #
 344 sysc_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 #
 352 sysc_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 #
 366 sysc_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 #
 376 sysc_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         sla     %r7,2
 380         mvc     SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
 381         lm      %r2,%r6,SP_R2(%r15)     # load svc arguments
 382         b       BASED(sysc_do_restart)  # restart svc
 383
 384 #
 385 # _TIF_SINGLE_STEP is set, call do_single_step
 386 #
 387 sysc_singlestep:
 388         ni      __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
 389         mvi     SP_TRAP+1(%r15),0x28    # set trap indication to pgm check
 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 #
 399 sysc_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                   # *4
 411         l       %r8,0(%r7,%r8)
 412 sysc_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
 417 sysc_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
 429 ret_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
 435 0:      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
 446 kernel_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.
 463 0:      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
 479 pgm_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
 505 pgm_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
 512 pgm_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 #
 523 pgm_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 #
 536 pgm_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
 545 pgm_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 #
 565 pgm_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 #
 588 kernel_per:
 589         mvi     SP_TRAP+1(%r15),0x28    # set trap indication to pgm check
 590         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 591         l       %r1,BASED(.Lhandle_per) # load adr. of per handler
 592         la      %r14,BASED(sysc_restore)# load adr. of system return
 593         br      %r1                     # branch to do_single_step
 594
 595 /*
 596  * IO interrupt handler routine
 597  */
 598
 599         .globl io_int_handler
 600 io_int_handler:
 601         STORE_TIMER __LC_ASYNC_ENTER_TIMER
 602         stck    __LC_INT_CLOCK
 603         SAVE_ALL_BASE __LC_SAVE_AREA+16
 604         SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
 605         CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
 606 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 607         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 608         bz      BASED(io_no_vtime)
 609         UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
 610         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 611         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
 612 io_no_vtime:
 613 #endif
 614         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 615         TRACE_IRQS_OFF
 616         l       %r1,BASED(.Ldo_IRQ)     # load address of do_IRQ
 617         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 618         basr    %r14,%r1                # branch to standard irq handler
 619 io_return:
 620         tm      __TI_flags+3(%r9),_TIF_WORK_INT
 621         bnz     BASED(io_work)          # there is work to do (signals etc.)
 622 io_restore:
 623 #ifdef CONFIG_TRACE_IRQFLAGS
 624         la      %r1,BASED(io_restore_trace_psw)
 625         lpsw    0(%r1)
 626 io_restore_trace:
 627         TRACE_IRQS_CHECK
 628         LOCKDEP_SYS_EXIT
 629 #endif
 630 io_leave:
 631         RESTORE_ALL __LC_RETURN_PSW,0
 632 io_done:
 633
 634 #ifdef CONFIG_TRACE_IRQFLAGS
 635         .align  8
 636         .globl  io_restore_trace_psw
 637 io_restore_trace_psw:
 638         .long   0, io_restore_trace + 0x80000000
 639 #endif
 640
 641 #
 642 # switch to kernel stack, then check the TIF bits
 643 #
 644 io_work:
 645         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 646 #ifndef CONFIG_PREEMPT
 647         bno     BASED(io_restore)       # no-> skip resched & signal
 648 #else
 649         bnz     BASED(io_work_user)     # no -> check for preemptive scheduling
 650         # check for preemptive scheduling
 651         icm     %r0,15,__TI_precount(%r9)
 652         bnz     BASED(io_restore)       # preemption disabled
 653         l       %r1,SP_R15(%r15)
 654         s       %r1,BASED(.Lc_spsize)
 655         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 656         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 657         lr      %r15,%r1
 658 io_resume_loop:
 659         tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
 660         bno     BASED(io_restore)
 661         l       %r1,BASED(.Lpreempt_schedule_irq)
 662         la      %r14,BASED(io_resume_loop)
 663         br      %r1                     # call schedule
 664 #endif
 665
 666 io_work_user:
 667         l       %r1,__LC_KERNEL_STACK
 668         s       %r1,BASED(.Lc_spsize)
 669         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 670         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 671         lr      %r15,%r1
 672 #
 673 # One of the work bits is on. Find out which one.
 674 # Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED
 675 #               and _TIF_MCCK_PENDING
 676 #
 677 io_work_loop:
 678         tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
 679         bo      BASED(io_mcck_pending)
 680         tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
 681         bo      BASED(io_reschedule)
 682         tm      __TI_flags+3(%r9),_TIF_SIGPENDING
 683         bnz     BASED(io_sigpending)
 684         tm      __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
 685         bnz     BASED(io_notify_resume)
 686         b       BASED(io_restore)
 687 io_work_done:
 688
 689 #
 690 # _TIF_MCCK_PENDING is set, call handler
 691 #
 692 io_mcck_pending:
 693         l       %r1,BASED(.Ls390_handle_mcck)
 694         basr    %r14,%r1                # TIF bit will be cleared by handler
 695         b       BASED(io_work_loop)
 696
 697 #
 698 # _TIF_NEED_RESCHED is set, call schedule
 699 #
 700 io_reschedule:
 701         TRACE_IRQS_ON
 702         l       %r1,BASED(.Lschedule)
 703         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 704         basr    %r14,%r1                # call scheduler
 705         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 706         TRACE_IRQS_OFF
 707         tm      __TI_flags+3(%r9),_TIF_WORK_INT
 708         bz      BASED(io_restore)       # there is no work to do
 709         b       BASED(io_work_loop)
 710
 711 #
 712 # _TIF_SIGPENDING is set, call do_signal
 713 #
 714 io_sigpending:
 715         TRACE_IRQS_ON
 716         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 717         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 718         l       %r1,BASED(.Ldo_signal)
 719         basr    %r14,%r1                # call do_signal
 720         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 721         TRACE_IRQS_OFF
 722         b       BASED(io_work_loop)
 723
 724 #
 725 # _TIF_SIGPENDING is set, call do_signal
 726 #
 727 io_notify_resume:
 728         TRACE_IRQS_ON
 729         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 730         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 731         l       %r1,BASED(.Ldo_notify_resume)
 732         basr    %r14,%r1                # call do_signal
 733         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 734         TRACE_IRQS_OFF
 735         b       BASED(io_work_loop)
 736
 737 /*
 738  * External interrupt handler routine
 739  */
 740
 741         .globl  ext_int_handler
 742 ext_int_handler:
 743         STORE_TIMER __LC_ASYNC_ENTER_TIMER
 744         stck    __LC_INT_CLOCK
 745         SAVE_ALL_BASE __LC_SAVE_AREA+16
 746         SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
 747         CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
 748 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 749         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 750         bz      BASED(ext_no_vtime)
 751         UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
 752         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 753         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
 754 ext_no_vtime:
 755 #endif
 756         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 757         TRACE_IRQS_OFF
 758         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 759         lh      %r3,__LC_EXT_INT_CODE   # get interruption code
 760         l       %r1,BASED(.Ldo_extint)
 761         basr    %r14,%r1
 762         b       BASED(io_return)
 763
 764 __critical_end:
 765
 766 /*
 767  * Machine check handler routines
 768  */
 769
 770         .globl mcck_int_handler
 771 mcck_int_handler:
 772         spt     __LC_CPU_TIMER_SAVE_AREA        # revalidate cpu timer
 773         lm      %r0,%r15,__LC_GPREGS_SAVE_AREA  # revalidate gprs
 774         SAVE_ALL_BASE __LC_SAVE_AREA+32
 775         la      %r12,__LC_MCK_OLD_PSW
 776         tm      __LC_MCCK_CODE,0x80     # system damage?
 777         bo      BASED(mcck_int_main)    # yes -> rest of mcck code invalid
 778 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 779         mvc     __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
 780         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
 781         tm      __LC_MCCK_CODE+5,0x02   # stored cpu timer value valid?
 782         bo      BASED(1f)
 783         la      %r14,__LC_SYNC_ENTER_TIMER
 784         clc     0(8,%r14),__LC_ASYNC_ENTER_TIMER
 785         bl      BASED(0f)
 786         la      %r14,__LC_ASYNC_ENTER_TIMER
 787 0:      clc     0(8,%r14),__LC_EXIT_TIMER
 788         bl      BASED(0f)
 789         la      %r14,__LC_EXIT_TIMER
 790 0:      clc     0(8,%r14),__LC_LAST_UPDATE_TIMER
 791         bl      BASED(0f)
 792         la      %r14,__LC_LAST_UPDATE_TIMER
 793 0:      spt     0(%r14)
 794         mvc     __LC_ASYNC_ENTER_TIMER(8),0(%r14)
 795 1:
 796 #endif
 797         tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
 798         bno     BASED(mcck_int_main)    # no -> skip cleanup critical
 799         tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
 800         bnz     BASED(mcck_int_main)    # from user -> load async stack
 801         clc     __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
 802         bhe     BASED(mcck_int_main)
 803         clc     __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
 804         bl      BASED(mcck_int_main)
 805         l       %r14,BASED(.Lcleanup_critical)
 806         basr    %r14,%r14
 807 mcck_int_main:
 808         l       %r14,__LC_PANIC_STACK   # are we already on the panic stack?
 809         slr     %r14,%r15
 810         sra     %r14,PAGE_SHIFT
 811         be      BASED(0f)
 812         l       %r15,__LC_PANIC_STACK   # load panic stack
 813 0:      CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
 814 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 815         tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
 816         bno     BASED(mcck_no_vtime)    # no -> skip cleanup critical
 817         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 818         bz      BASED(mcck_no_vtime)
 819         UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
 820         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 821         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
 822 mcck_no_vtime:
 823 #endif
 824         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 825         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 826         l       %r1,BASED(.Ls390_mcck)
 827         basr    %r14,%r1                # call machine check handler
 828         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 829         bno     BASED(mcck_return)
 830         l       %r1,__LC_KERNEL_STACK   # switch to kernel stack
 831         s       %r1,BASED(.Lc_spsize)
 832         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 833         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 834         lr      %r15,%r1
 835         stosm   __SF_EMPTY(%r15),0x04   # turn dat on
 836         tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
 837         bno     BASED(mcck_return)
 838         TRACE_IRQS_OFF
 839         l       %r1,BASED(.Ls390_handle_mcck)
 840         basr    %r14,%r1                # call machine check handler
 841         TRACE_IRQS_ON
 842 mcck_return:
 843         mvc     __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
 844         ni      __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
 845 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 846         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
 847         tm      __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
 848         bno     BASED(0f)
 849         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15
 850         stpt    __LC_EXIT_TIMER
 851         lpsw    __LC_RETURN_MCCK_PSW    # back to caller
 852 0:
 853 #endif
 854         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15
 855         lpsw    __LC_RETURN_MCCK_PSW    # back to caller
 856
 857         RESTORE_ALL __LC_RETURN_MCCK_PSW,0
 858
 859 /*
 860  * Restart interruption handler, kick starter for additional CPUs
 861  */
 862 #ifdef CONFIG_SMP
 863         __CPUINIT
 864         .globl restart_int_handler
 865 restart_int_handler:
 866         l       %r15,__LC_SAVE_AREA+60  # load ksp
 867         lctl    %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
 868         lam     %a0,%a15,__LC_AREGS_SAVE_AREA
 869         lm      %r6,%r15,__SF_GPRS(%r15) # load registers from clone
 870         stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
 871         basr    %r14,0
 872         l       %r14,restart_addr-.(%r14)
 873         br      %r14                    # branch to start_secondary
 874 restart_addr:
 875         .long   start_secondary
 876         .previous
 877 #else
 878 /*
 879  * If we do not run with SMP enabled, let the new CPU crash ...
 880  */
 881         .globl restart_int_handler
 882 restart_int_handler:
 883         basr    %r1,0
 884 restart_base:
 885         lpsw    restart_crash-restart_base(%r1)
 886         .align  8
 887 restart_crash:
 888         .long   0x000a0000,0x00000000
 889 restart_go:
 890 #endif
 891
 892 #ifdef CONFIG_CHECK_STACK
 893 /*
 894  * The synchronous or the asynchronous stack overflowed. We are dead.
 895  * No need to properly save the registers, we are going to panic anyway.
 896  * Setup a pt_regs so that show_trace can provide a good call trace.
 897  */
 898 stack_overflow:
 899         l       %r15,__LC_PANIC_STACK   # change to panic stack
 900         sl      %r15,BASED(.Lc_spsize)
 901         mvc     SP_PSW(8,%r15),0(%r12)  # move user PSW to stack
 902         stm     %r0,%r11,SP_R0(%r15)    # store gprs %r0-%r11 to kernel stack
 903         la      %r1,__LC_SAVE_AREA
 904         ch      %r12,BASED(.L0x020)     # old psw addr == __LC_SVC_OLD_PSW ?
 905         be      BASED(0f)
 906         ch      %r12,BASED(.L0x028)     # old psw addr == __LC_PGM_OLD_PSW ?
 907         be      BASED(0f)
 908         la      %r1,__LC_SAVE_AREA+16
 909 0:      mvc     SP_R12(16,%r15),0(%r1)  # move %r12-%r15 to stack
 910         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
 911         l       %r1,BASED(1f)           # branch to kernel_stack_overflow
 912         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 913         br      %r1
 914 1:      .long   kernel_stack_overflow
 915 #endif
 916
 917 cleanup_table_system_call:
 918         .long   system_call + 0x80000000, sysc_do_svc + 0x80000000
 919 cleanup_table_sysc_return:
 920         .long   sysc_return + 0x80000000, sysc_leave + 0x80000000
 921 cleanup_table_sysc_leave:
 922         .long   sysc_leave + 0x80000000, sysc_done + 0x80000000
 923 cleanup_table_sysc_work_loop:
 924         .long   sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000
 925 cleanup_table_io_return:
 926         .long   io_return + 0x80000000, io_leave + 0x80000000
 927 cleanup_table_io_leave:
 928         .long   io_leave + 0x80000000, io_done + 0x80000000
 929 cleanup_table_io_work_loop:
 930         .long   io_work_loop + 0x80000000, io_work_done + 0x80000000
 931
 932 cleanup_critical:
 933         clc     4(4,%r12),BASED(cleanup_table_system_call)
 934         bl      BASED(0f)
 935         clc     4(4,%r12),BASED(cleanup_table_system_call+4)
 936         bl      BASED(cleanup_system_call)
 937 0:
 938         clc     4(4,%r12),BASED(cleanup_table_sysc_return)
 939         bl      BASED(0f)
 940         clc     4(4,%r12),BASED(cleanup_table_sysc_return+4)
 941         bl      BASED(cleanup_sysc_return)
 942 0:
 943         clc     4(4,%r12),BASED(cleanup_table_sysc_leave)
 944         bl      BASED(0f)
 945         clc     4(4,%r12),BASED(cleanup_table_sysc_leave+4)
 946         bl      BASED(cleanup_sysc_leave)
 947 0:
 948         clc     4(4,%r12),BASED(cleanup_table_sysc_work_loop)
 949         bl      BASED(0f)
 950         clc     4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
 951         bl      BASED(cleanup_sysc_return)
 952 0:
 953         clc     4(4,%r12),BASED(cleanup_table_io_return)
 954         bl      BASED(0f)
 955         clc     4(4,%r12),BASED(cleanup_table_io_return+4)
 956         bl      BASED(cleanup_io_return)
 957 0:
 958         clc     4(4,%r12),BASED(cleanup_table_io_leave)
 959         bl      BASED(0f)
 960         clc     4(4,%r12),BASED(cleanup_table_io_leave+4)
 961         bl      BASED(cleanup_io_leave)
 962 0:
 963         clc     4(4,%r12),BASED(cleanup_table_io_work_loop)
 964         bl      BASED(0f)
 965         clc     4(4,%r12),BASED(cleanup_table_io_work_loop+4)
 966         bl      BASED(cleanup_io_return)
 967 0:
 968         br      %r14
 969
 970 cleanup_system_call:
 971         mvc     __LC_RETURN_PSW(8),0(%r12)
 972         c       %r12,BASED(.Lmck_old_psw)
 973         be      BASED(0f)
 974         la      %r12,__LC_SAVE_AREA+16
 975         b       BASED(1f)
 976 0:      la      %r12,__LC_SAVE_AREA+32
 977 1:
 978 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 979         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
 980         bh      BASED(0f)
 981         mvc     __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
 982 0:      clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
 983         bhe     BASED(cleanup_vtime)
 984 #endif
 985         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
 986         bh      BASED(0f)
 987         mvc     __LC_SAVE_AREA(16),0(%r12)
 988 0:      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
 995 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 996 cleanup_vtime:
 997         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
 998         bhe     BASED(cleanup_stime)
 999         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
1000 cleanup_stime:
1001         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
1002         bh      BASED(cleanup_update)
1003         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
1004 cleanup_update:
1005         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
1006 #endif
1007         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
1008         la      %r12,__LC_RETURN_PSW
1009         br      %r14
1010 cleanup_system_call_insn:
1011         .long   sysc_saveall + 0x80000000
1012 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1013         .long   system_call + 0x80000000
1014         .long   sysc_vtime + 0x80000000
1015         .long   sysc_stime + 0x80000000
1016         .long   sysc_update + 0x80000000
1017 #endif
1018
1019 cleanup_sysc_return:
1020         mvc     __LC_RETURN_PSW(4),0(%r12)
1021         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
1022         la      %r12,__LC_RETURN_PSW
1023         br      %r14
1024
1025 cleanup_sysc_leave:
1026         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn)
1027         be      BASED(2f)
1028 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1029         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1030         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
1031         be      BASED(2f)
1032 #endif
1033         mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
1034         c       %r12,BASED(.Lmck_old_psw)
1035         bne     BASED(0f)
1036         mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
1037         b       BASED(1f)
1038 0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
1039 1:      lm      %r0,%r11,SP_R0(%r15)
1040         l       %r15,SP_R15(%r15)
1041 2:      la      %r12,__LC_RETURN_PSW
1042         br      %r14
1043 cleanup_sysc_leave_insn:
1044         .long   sysc_done - 4 + 0x80000000
1045 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1046         .long   sysc_done - 8 + 0x80000000
1047 #endif
1048
1049 cleanup_io_return:
1050         mvc     __LC_RETURN_PSW(4),0(%r12)
1051         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
1052         la      %r12,__LC_RETURN_PSW
1053         br      %r14
1054
1055 cleanup_io_leave:
1056         clc     4(4,%r12),BASED(cleanup_io_leave_insn)
1057         be      BASED(2f)
1058 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1059         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1060         clc     4(4,%r12),BASED(cleanup_io_leave_insn+4)
1061         be      BASED(2f)
1062 #endif
1063         mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
1064         c       %r12,BASED(.Lmck_old_psw)
1065         bne     BASED(0f)
1066         mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
1067         b       BASED(1f)
1068 0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
1069 1:      lm      %r0,%r11,SP_R0(%r15)
1070         l       %r15,SP_R15(%r15)
1071 2:      la      %r12,__LC_RETURN_PSW
1072         br      %r14
1073 cleanup_io_leave_insn:
1074         .long   io_done - 4 + 0x80000000
1075 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1076         .long   io_done - 8 + 0x80000000
1077 #endif
1078
1079 /*
1080  * Integer constants
1081  */
1082                 .align  4
1083 .Lc_spsize:     .long   SP_SIZE
1084 .Lc_overhead:   .long   STACK_FRAME_OVERHEAD
1085 .Lnr_syscalls:  .long   NR_syscalls
1086 .L0x018:        .short  0x018
1087 .L0x020:        .short  0x020
1088 .L0x028:        .short  0x028
1089 .L0x030:        .short  0x030
1090 .L0x038:        .short  0x038
1091 .Lc_1:          .long   1
1092
1093 /*
1094  * Symbol constants
1095  */
1096 .Ls390_mcck:    .long   s390_do_machine_check
1097 .Ls390_handle_mcck:
1098                 .long   s390_handle_mcck
1099 .Lmck_old_psw:  .long   __LC_MCK_OLD_PSW
1100 .Ldo_IRQ:       .long   do_IRQ
1101 .Ldo_extint:    .long   do_extint
1102 .Ldo_signal:    .long   do_signal
1103 .Ldo_notify_resume:
1104                 .long   do_notify_resume
1105 .Lhandle_per:   .long   do_single_step
1106 .Ldo_execve:    .long   do_execve
1107 .Lexecve_tail:  .long   execve_tail
1108 .Ljump_table:   .long   pgm_check_table
1109 .Lschedule:     .long   schedule
1110 #ifdef CONFIG_PREEMPT
1111 .Lpreempt_schedule_irq:
1112                 .long   preempt_schedule_irq
1113 #endif
1114 .Ltrace_entry:  .long   do_syscall_trace_enter
1115 .Ltrace_exit:   .long   do_syscall_trace_exit
1116 .Lschedtail:    .long   schedule_tail
1117 .Lsysc_table:   .long   sys_call_table
1118 #ifdef CONFIG_TRACE_IRQFLAGS
1119 .Ltrace_irq_on_caller:
1120                 .long   trace_hardirqs_on_caller
1121 .Ltrace_irq_off_caller:
1122                 .long   trace_hardirqs_off_caller
1123 #endif
1124 #ifdef CONFIG_LOCKDEP
1125 .Llockdep_sys_exit:
1126                 .long   lockdep_sys_exit
1127 #endif
1128 .Lcritical_start:
1129                 .long   __critical_start + 0x80000000
1130 .Lcritical_end:
1131                 .long   __critical_end + 0x80000000
1132 .Lcleanup_critical:
1133                 .long   cleanup_critical
1134
1135                 .section .rodata, "a"
1136 #define SYSCALL(esa,esame,emu)  .long esa
1137 sys_call_table:
1138 #include "syscalls.S"
1139 #undef SYSCALL