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         l       %r1,BASED(.Ltrace_irq_on)
  65         basr    %r14,%r1
  66         .endm
  67
  68         .macro  TRACE_IRQS_OFF
  69         l       %r1,BASED(.Ltrace_irq_off)
  70         basr    %r14,%r1
  71         .endm
  72
  73         .macro  TRACE_IRQS_CHECK
  74         tm      SP_PSW(%r15),0x03       # irqs enabled?
  75         jz      0f
  76         l       %r1,BASED(.Ltrace_irq_on)
  77         basr    %r14,%r1
  78         j       1f
  79 0:      l       %r1,BASED(.Ltrace_irq_off)
  80         basr    %r14,%r1
  81 1:
  82         .endm
  83 #else
  84 #define TRACE_IRQS_ON
  85 #define TRACE_IRQS_OFF
  86 #define TRACE_IRQS_CHECK
  87 #endif
  88
  89 #ifdef CONFIG_LOCKDEP
  90         .macro  LOCKDEP_SYS_EXIT
  91         tm      SP_PSW+1(%r15),0x01     # returning to user ?
  92         jz      0f
  93         l       %r1,BASED(.Llockdep_sys_exit)
  94         basr    %r14,%r1
  95 0:
  96         .endm
  97 #else
  98 #define LOCKDEP_SYS_EXIT
  99 #endif
 100
 101 /*
 102  * Register usage in interrupt handlers:
 103  *    R9  - pointer to current task structure
 104  *    R13 - pointer to literal pool
 105  *    R14 - return register for function calls
 106  *    R15 - kernel stack pointer
 107  */
 108
 109         .macro  STORE_TIMER lc_offset
 110 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 111         stpt    \lc_offset
 112 #endif
 113         .endm
 114
 115 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 116         .macro  UPDATE_VTIME lc_from,lc_to,lc_sum
 117         lm      %r10,%r11,\lc_from
 118         sl      %r10,\lc_to
 119         sl      %r11,\lc_to+4
 120         bc      3,BASED(0f)
 121         sl      %r10,BASED(.Lc_1)
 122 0:      al      %r10,\lc_sum
 123         al      %r11,\lc_sum+4
 124         bc      12,BASED(1f)
 125         al      %r10,BASED(.Lc_1)
 126 1:      stm     %r10,%r11,\lc_sum
 127         .endm
 128 #endif
 129
 130         .macro  SAVE_ALL_BASE savearea
 131         stm     %r12,%r15,\savearea
 132         l       %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
 133         .endm
 134
 135         .macro  SAVE_ALL_SVC psworg,savearea
 136         la      %r12,\psworg
 137         l       %r15,__LC_KERNEL_STACK  # problem state -> load ksp
 138         .endm
 139
 140         .macro  SAVE_ALL_SYNC psworg,savearea
 141         la      %r12,\psworg
 142         tm      \psworg+1,0x01          # test problem state bit
 143         bz      BASED(2f)               # skip stack setup save
 144         l       %r15,__LC_KERNEL_STACK  # problem state -> load ksp
 145 #ifdef CONFIG_CHECK_STACK
 146         b       BASED(3f)
 147 2:      tml     %r15,STACK_SIZE - CONFIG_STACK_GUARD
 148         bz      BASED(stack_overflow)
 149 3:
 150 #endif
 151 2:
 152         .endm
 153
 154         .macro  SAVE_ALL_ASYNC psworg,savearea
 155         la      %r12,\psworg
 156         tm      \psworg+1,0x01          # test problem state bit
 157         bnz     BASED(1f)               # from user -> load async stack
 158         clc     \psworg+4(4),BASED(.Lcritical_end)
 159         bhe     BASED(0f)
 160         clc     \psworg+4(4),BASED(.Lcritical_start)
 161         bl      BASED(0f)
 162         l       %r14,BASED(.Lcleanup_critical)
 163         basr    %r14,%r14
 164         tm      1(%r12),0x01            # retest problem state after cleanup
 165         bnz     BASED(1f)
 166 0:      l       %r14,__LC_ASYNC_STACK   # are we already on the async stack ?
 167         slr     %r14,%r15
 168         sra     %r14,STACK_SHIFT
 169         be      BASED(2f)
 170 1:      l       %r15,__LC_ASYNC_STACK
 171 #ifdef CONFIG_CHECK_STACK
 172         b       BASED(3f)
 173 2:      tml     %r15,STACK_SIZE - CONFIG_STACK_GUARD
 174         bz      BASED(stack_overflow)
 175 3:
 176 #endif
 177 2:
 178         .endm
 179
 180         .macro  CREATE_STACK_FRAME psworg,savearea
 181         s       %r15,BASED(.Lc_spsize)  # make room for registers & psw
 182         mvc     SP_PSW(8,%r15),0(%r12)  # move user PSW to stack
 183         la      %r12,\psworg
 184         st      %r2,SP_ORIG_R2(%r15)    # store original content of gpr 2
 185         icm     %r12,12,__LC_SVC_ILC
 186         stm     %r0,%r11,SP_R0(%r15)    # store gprs %r0-%r11 to kernel stack
 187         st      %r12,SP_ILC(%r15)
 188         mvc     SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
 189         la      %r12,0
 190         st      %r12,__SF_BACKCHAIN(%r15)       # clear back chain
 191         .endm
 192
 193         .macro  RESTORE_ALL psworg,sync
 194         mvc     \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
 195         .if !\sync
 196         ni      \psworg+1,0xfd          # clear wait state bit
 197         .endif
 198         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15 of user
 199         STORE_TIMER __LC_EXIT_TIMER
 200         lpsw    \psworg                 # back to caller
 201         .endm
 202
 203 /*
 204  * Scheduler resume function, called by switch_to
 205  *  gpr2 = (task_struct *) prev
 206  *  gpr3 = (task_struct *) next
 207  * Returns:
 208  *  gpr2 = prev
 209  */
 210         .globl  __switch_to
 211 __switch_to:
 212         basr    %r1,0
 213 __switch_to_base:
 214         tm      __THREAD_per(%r3),0xe8          # new process is using per ?
 215         bz      __switch_to_noper-__switch_to_base(%r1) # if not we're fine
 216         stctl   %c9,%c11,__SF_EMPTY(%r15)       # We are using per stuff
 217         clc     __THREAD_per(12,%r3),__SF_EMPTY(%r15)
 218         be      __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
 219         lctl    %c9,%c11,__THREAD_per(%r3)      # Nope we didn't
 220 __switch_to_noper:
 221         l       %r4,__THREAD_info(%r2)          # get thread_info of prev
 222         tm      __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
 223         bz      __switch_to_no_mcck-__switch_to_base(%r1)
 224         ni      __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
 225         l       %r4,__THREAD_info(%r3)          # get thread_info of next
 226         oi      __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
 227 __switch_to_no_mcck:
 228         stm     %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
 229         st      %r15,__THREAD_ksp(%r2)  # store kernel stack to prev->tss.ksp
 230         l       %r15,__THREAD_ksp(%r3)  # load kernel stack from next->tss.ksp
 231         lm      %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
 232         st      %r3,__LC_CURRENT        # __LC_CURRENT = current task struct
 233         lctl    %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
 234         l       %r3,__THREAD_info(%r3)  # load thread_info from task struct
 235         st      %r3,__LC_THREAD_INFO
 236         ahi     %r3,STACK_SIZE
 237         st      %r3,__LC_KERNEL_STACK   # __LC_KERNEL_STACK = new kernel stack
 238         br      %r14
 239
 240 __critical_start:
 241 /*
 242  * SVC interrupt handler routine. System calls are synchronous events and
 243  * are executed with interrupts enabled.
 244  */
 245
 246         .globl  system_call
 247 system_call:
 248         STORE_TIMER __LC_SYNC_ENTER_TIMER
 249 sysc_saveall:
 250         SAVE_ALL_BASE __LC_SAVE_AREA
 251         SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 252         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 253         lh      %r7,0x8a          # get svc number from lowcore
 254 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 255 sysc_vtime:
 256         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 257 sysc_stime:
 258         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 259 sysc_update:
 260         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
 261 #endif
 262 sysc_do_svc:
 263         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 264         sla     %r7,2                   # *4 and test for svc 0
 265         bnz     BASED(sysc_nr_ok)       # svc number > 0
 266         # svc 0: system call number in %r1
 267         cl      %r1,BASED(.Lnr_syscalls)
 268         bnl     BASED(sysc_nr_ok)
 269         lr      %r7,%r1           # copy svc number to %r7
 270         sla     %r7,2             # *4
 271 sysc_nr_ok:
 272         mvc     SP_ARGS(4,%r15),SP_R7(%r15)
 273 sysc_do_restart:
 274         l       %r8,BASED(.Lsysc_table)
 275         tm      __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
 276         l       %r8,0(%r7,%r8)    # get system call addr.
 277         bnz     BASED(sysc_tracesys)
 278         basr    %r14,%r8          # call sys_xxxx
 279         st      %r2,SP_R2(%r15)   # store return value (change R2 on stack)
 280
 281 sysc_return:
 282         tm      __TI_flags+3(%r9),_TIF_WORK_SVC
 283         bnz     BASED(sysc_work)  # there is work to do (signals etc.)
 284 sysc_restore:
 285 #ifdef CONFIG_TRACE_IRQFLAGS
 286         la      %r1,BASED(sysc_restore_trace_psw)
 287         lpsw    0(%r1)
 288 sysc_restore_trace:
 289         TRACE_IRQS_CHECK
 290         LOCKDEP_SYS_EXIT
 291 #endif
 292 sysc_leave:
 293         RESTORE_ALL __LC_RETURN_PSW,1
 294 sysc_done:
 295
 296 #ifdef CONFIG_TRACE_IRQFLAGS
 297         .align  8
 298         .globl  sysc_restore_trace_psw
 299 sysc_restore_trace_psw:
 300         .long   0, sysc_restore_trace + 0x80000000
 301 #endif
 302
 303 #
 304 # recheck if there is more work to do
 305 #
 306 sysc_work_loop:
 307         tm      __TI_flags+3(%r9),_TIF_WORK_SVC
 308         bz      BASED(sysc_restore)     # there is no work to do
 309 #
 310 # One of the work bits is on. Find out which one.
 311 #
 312 sysc_work:
 313         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 314         bno     BASED(sysc_restore)
 315         tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
 316         bo      BASED(sysc_mcck_pending)
 317         tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
 318         bo      BASED(sysc_reschedule)
 319         tm      __TI_flags+3(%r9),_TIF_SIGPENDING
 320         bnz     BASED(sysc_sigpending)
 321         tm      __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
 322         bnz     BASED(sysc_notify_resume)
 323         tm      __TI_flags+3(%r9),_TIF_RESTART_SVC
 324         bo      BASED(sysc_restart)
 325         tm      __TI_flags+3(%r9),_TIF_SINGLE_STEP
 326         bo      BASED(sysc_singlestep)
 327         b       BASED(sysc_restore)
 328 sysc_work_done:
 329
 330 #
 331 # _TIF_NEED_RESCHED is set, call schedule
 332 #
 333 sysc_reschedule:
 334         l       %r1,BASED(.Lschedule)
 335         la      %r14,BASED(sysc_work_loop)
 336         br      %r1                     # call scheduler
 337
 338 #
 339 # _TIF_MCCK_PENDING is set, call handler
 340 #
 341 sysc_mcck_pending:
 342         l       %r1,BASED(.Ls390_handle_mcck)
 343         la      %r14,BASED(sysc_work_loop)
 344         br      %r1                     # TIF bit will be cleared by handler
 345
 346 #
 347 # _TIF_SIGPENDING is set, call do_signal
 348 #
 349 sysc_sigpending:
 350         ni      __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
 351         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 352         l       %r1,BASED(.Ldo_signal)
 353         basr    %r14,%r1                # call do_signal
 354         tm      __TI_flags+3(%r9),_TIF_RESTART_SVC
 355         bo      BASED(sysc_restart)
 356         tm      __TI_flags+3(%r9),_TIF_SINGLE_STEP
 357         bo      BASED(sysc_singlestep)
 358         b       BASED(sysc_work_loop)
 359
 360 #
 361 # _TIF_NOTIFY_RESUME is set, call do_notify_resume
 362 #
 363 sysc_notify_resume:
 364         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 365         l       %r1,BASED(.Ldo_notify_resume)
 366         la      %r14,BASED(sysc_work_loop)
 367         br      %r1                     # call do_notify_resume
 368
 369
 370 #
 371 # _TIF_RESTART_SVC is set, set up registers and restart svc
 372 #
 373 sysc_restart:
 374         ni      __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
 375         l       %r7,SP_R2(%r15)         # load new svc number
 376         sla     %r7,2
 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 #
 384 sysc_singlestep:
 385         ni      __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
 386         mvi     SP_TRAP+1(%r15),0x28    # set trap indication to pgm check
 387         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 388         l       %r1,BASED(.Lhandle_per) # load adr. of per handler
 389         la      %r14,BASED(sysc_return) # load adr. of system return
 390         br      %r1                     # branch to do_single_step
 391
 392 #
 393 # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
 394 # and after the system call
 395 #
 396 sysc_tracesys:
 397         l       %r1,BASED(.Ltrace_entry)
 398         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 399         la      %r3,0
 400         srl     %r7,2
 401         st      %r7,SP_R2(%r15)
 402         basr    %r14,%r1
 403         cl      %r2,BASED(.Lnr_syscalls)
 404         bnl     BASED(sysc_tracenogo)
 405         l       %r8,BASED(.Lsysc_table)
 406         lr      %r7,%r2
 407         sll     %r7,2                   # *4
 408         l       %r8,0(%r7,%r8)
 409 sysc_tracego:
 410         lm      %r3,%r6,SP_R3(%r15)
 411         l       %r2,SP_ORIG_R2(%r15)
 412         basr    %r14,%r8                # call sys_xxx
 413         st      %r2,SP_R2(%r15)         # store return value
 414 sysc_tracenogo:
 415         tm      __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
 416         bz      BASED(sysc_return)
 417         l       %r1,BASED(.Ltrace_exit)
 418         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 419         la      %r14,BASED(sysc_return)
 420         br      %r1
 421
 422 #
 423 # a new process exits the kernel with ret_from_fork
 424 #
 425         .globl  ret_from_fork
 426 ret_from_fork:
 427         l       %r13,__LC_SVC_NEW_PSW+4
 428         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 429         tm      SP_PSW+1(%r15),0x01     # forking a kernel thread ?
 430         bo      BASED(0f)
 431         st      %r15,SP_R15(%r15)       # store stack pointer for new kthread
 432 0:      l       %r1,BASED(.Lschedtail)
 433         basr    %r14,%r1
 434         TRACE_IRQS_ON
 435         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 436         b       BASED(sysc_return)
 437
 438 #
 439 # kernel_execve function needs to deal with pt_regs that is not
 440 # at the usual place
 441 #
 442         .globl  kernel_execve
 443 kernel_execve:
 444         stm     %r12,%r15,48(%r15)
 445         lr      %r14,%r15
 446         l       %r13,__LC_SVC_NEW_PSW+4
 447         s       %r15,BASED(.Lc_spsize)
 448         st      %r14,__SF_BACKCHAIN(%r15)
 449         la      %r12,SP_PTREGS(%r15)
 450         xc      0(__PT_SIZE,%r12),0(%r12)
 451         l       %r1,BASED(.Ldo_execve)
 452         lr      %r5,%r12
 453         basr    %r14,%r1
 454         ltr     %r2,%r2
 455         be      BASED(0f)
 456         a       %r15,BASED(.Lc_spsize)
 457         lm      %r12,%r15,48(%r15)
 458         br      %r14
 459         # execve succeeded.
 460 0:      stnsm   __SF_EMPTY(%r15),0xfc   # disable interrupts
 461         l       %r15,__LC_KERNEL_STACK  # load ksp
 462         s       %r15,BASED(.Lc_spsize)  # make room for registers & psw
 463         l       %r9,__LC_THREAD_INFO
 464         mvc     SP_PTREGS(__PT_SIZE,%r15),0(%r12)       # copy pt_regs
 465         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
 466         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 467         l       %r1,BASED(.Lexecve_tail)
 468         basr    %r14,%r1
 469         b       BASED(sysc_return)
 470
 471 /*
 472  * Program check handler routine
 473  */
 474
 475         .globl  pgm_check_handler
 476 pgm_check_handler:
 477 /*
 478  * First we need to check for a special case:
 479  * Single stepping an instruction that disables the PER event mask will
 480  * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
 481  * For a single stepped SVC the program check handler gets control after
 482  * the SVC new PSW has been loaded. But we want to execute the SVC first and
 483  * then handle the PER event. Therefore we update the SVC old PSW to point
 484  * to the pgm_check_handler and branch to the SVC handler after we checked
 485  * if we have to load the kernel stack register.
 486  * For every other possible cause for PER event without the PER mask set
 487  * we just ignore the PER event (FIXME: is there anything we have to do
 488  * for LPSW?).
 489  */
 490         STORE_TIMER __LC_SYNC_ENTER_TIMER
 491         SAVE_ALL_BASE __LC_SAVE_AREA
 492         tm      __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
 493         bnz     BASED(pgm_per)          # got per exception -> special case
 494         SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
 495         CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
 496 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 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
 502 pgm_no_vtime:
 503 #endif
 504         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 505         TRACE_IRQS_OFF
 506         l       %r3,__LC_PGM_ILC        # load program interruption code
 507         la      %r8,0x7f
 508         nr      %r8,%r3
 509 pgm_do_call:
 510         l       %r7,BASED(.Ljump_table)
 511         sll     %r8,2
 512         l       %r7,0(%r8,%r7)          # load address of handler routine
 513         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 514         la      %r14,BASED(sysc_return)
 515         br      %r7                     # branch to interrupt-handler
 516
 517 #
 518 # handle per exception
 519 #
 520 pgm_per:
 521         tm      __LC_PGM_OLD_PSW,0x40   # test if per event recording is on
 522         bnz     BASED(pgm_per_std)      # ok, normal per event from user space
 523 # ok its one of the special cases, now we need to find out which one
 524         clc     __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
 525         be      BASED(pgm_svcper)
 526 # no interesting special case, ignore PER event
 527         lm      %r12,%r15,__LC_SAVE_AREA
 528         lpsw    0x28
 529
 530 #
 531 # Normal per exception
 532 #
 533 pgm_per_std:
 534         SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
 535         CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
 536 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 537         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 538         bz      BASED(pgm_no_vtime2)
 539         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 540         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 541         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
 542 pgm_no_vtime2:
 543 #endif
 544         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 545         TRACE_IRQS_OFF
 546         l       %r1,__TI_task(%r9)
 547         mvc     __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
 548         mvc     __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
 549         mvc     __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
 550         oi      __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
 551         tm      SP_PSW+1(%r15),0x01     # kernel per event ?
 552         bz      BASED(kernel_per)
 553         l       %r3,__LC_PGM_ILC        # load program interruption code
 554         la      %r8,0x7f
 555         nr      %r8,%r3                 # clear per-event-bit and ilc
 556         be      BASED(sysc_return)      # only per or per+check ?
 557         b       BASED(pgm_do_call)
 558
 559 #
 560 # it was a single stepped SVC that is causing all the trouble
 561 #
 562 pgm_svcper:
 563         SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 564         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 565 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 566         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 567         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 568         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
 569 #endif
 570         lh      %r7,0x8a                # get svc number from lowcore
 571         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 572         TRACE_IRQS_OFF
 573         l       %r1,__TI_task(%r9)
 574         mvc     __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
 575         mvc     __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
 576         mvc     __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
 577         oi      __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
 578         TRACE_IRQS_ON
 579         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 580         b       BASED(sysc_do_svc)
 581
 582 #
 583 # per was called from kernel, must be kprobes
 584 #
 585 kernel_per:
 586         mvi     SP_TRAP+1(%r15),0x28    # set trap indication to pgm check
 587         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 588         l       %r1,BASED(.Lhandle_per) # load adr. of per handler
 589         la      %r14,BASED(sysc_restore)# load adr. of system return
 590         br      %r1                     # branch to do_single_step
 591
 592 /*
 593  * IO interrupt handler routine
 594  */
 595
 596         .globl io_int_handler
 597 io_int_handler:
 598         STORE_TIMER __LC_ASYNC_ENTER_TIMER
 599         stck    __LC_INT_CLOCK
 600         SAVE_ALL_BASE __LC_SAVE_AREA+16
 601         SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
 602         CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
 603 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 604         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 605         bz      BASED(io_no_vtime)
 606         UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
 607         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 608         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
 609 io_no_vtime:
 610 #endif
 611         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 612         TRACE_IRQS_OFF
 613         l       %r1,BASED(.Ldo_IRQ)     # load address of do_IRQ
 614         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 615         basr    %r14,%r1                # branch to standard irq handler
 616 io_return:
 617         tm      __TI_flags+3(%r9),_TIF_WORK_INT
 618         bnz     BASED(io_work)          # there is work to do (signals etc.)
 619 io_restore:
 620 #ifdef CONFIG_TRACE_IRQFLAGS
 621         la      %r1,BASED(io_restore_trace_psw)
 622         lpsw    0(%r1)
 623 io_restore_trace:
 624         TRACE_IRQS_CHECK
 625         LOCKDEP_SYS_EXIT
 626 #endif
 627 io_leave:
 628         RESTORE_ALL __LC_RETURN_PSW,0
 629 io_done:
 630
 631 #ifdef CONFIG_TRACE_IRQFLAGS
 632         .align  8
 633         .globl  io_restore_trace_psw
 634 io_restore_trace_psw:
 635         .long   0, io_restore_trace + 0x80000000
 636 #endif
 637
 638 #
 639 # switch to kernel stack, then check the TIF bits
 640 #
 641 io_work:
 642         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 643 #ifndef CONFIG_PREEMPT
 644         bno     BASED(io_restore)       # no-> skip resched & signal
 645 #else
 646         bnz     BASED(io_work_user)     # no -> check for preemptive scheduling
 647         # check for preemptive scheduling
 648         icm     %r0,15,__TI_precount(%r9)
 649         bnz     BASED(io_restore)       # preemption disabled
 650         l       %r1,SP_R15(%r15)
 651         s       %r1,BASED(.Lc_spsize)
 652         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 653         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 654         lr      %r15,%r1
 655 io_resume_loop:
 656         tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
 657         bno     BASED(io_restore)
 658         l       %r1,BASED(.Lpreempt_schedule_irq)
 659         la      %r14,BASED(io_resume_loop)
 660         br      %r1                     # call schedule
 661 #endif
 662
 663 io_work_user:
 664         l       %r1,__LC_KERNEL_STACK
 665         s       %r1,BASED(.Lc_spsize)
 666         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 667         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 668         lr      %r15,%r1
 669 #
 670 # One of the work bits is on. Find out which one.
 671 # Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED
 672 #               and _TIF_MCCK_PENDING
 673 #
 674 io_work_loop:
 675         tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
 676         bo      BASED(io_mcck_pending)
 677         tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
 678         bo      BASED(io_reschedule)
 679         tm      __TI_flags+3(%r9),_TIF_SIGPENDING
 680         bnz     BASED(io_sigpending)
 681         tm      __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
 682         bnz     BASED(io_notify_resume)
 683         b       BASED(io_restore)
 684 io_work_done:
 685
 686 #
 687 # _TIF_MCCK_PENDING is set, call handler
 688 #
 689 io_mcck_pending:
 690         l       %r1,BASED(.Ls390_handle_mcck)
 691         basr    %r14,%r1                # TIF bit will be cleared by handler
 692         b       BASED(io_work_loop)
 693
 694 #
 695 # _TIF_NEED_RESCHED is set, call schedule
 696 #
 697 io_reschedule:
 698         TRACE_IRQS_ON
 699         l       %r1,BASED(.Lschedule)
 700         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 701         basr    %r14,%r1                # call scheduler
 702         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 703         TRACE_IRQS_OFF
 704         tm      __TI_flags+3(%r9),_TIF_WORK_INT
 705         bz      BASED(io_restore)       # there is no work to do
 706         b       BASED(io_work_loop)
 707
 708 #
 709 # _TIF_SIGPENDING is set, call do_signal
 710 #
 711 io_sigpending:
 712         TRACE_IRQS_ON
 713         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 714         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 715         l       %r1,BASED(.Ldo_signal)
 716         basr    %r14,%r1                # call do_signal
 717         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 718         TRACE_IRQS_OFF
 719         b       BASED(io_work_loop)
 720
 721 #
 722 # _TIF_SIGPENDING is set, call do_signal
 723 #
 724 io_notify_resume:
 725         TRACE_IRQS_ON
 726         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
 727         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 728         l       %r1,BASED(.Ldo_notify_resume)
 729         basr    %r14,%r1                # call do_signal
 730         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
 731         TRACE_IRQS_OFF
 732         b       BASED(io_work_loop)
 733
 734 /*
 735  * External interrupt handler routine
 736  */
 737
 738         .globl  ext_int_handler
 739 ext_int_handler:
 740         STORE_TIMER __LC_ASYNC_ENTER_TIMER
 741         stck    __LC_INT_CLOCK
 742         SAVE_ALL_BASE __LC_SAVE_AREA+16
 743         SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
 744         CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
 745 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 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
 751 ext_no_vtime:
 752 #endif
 753         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 754         TRACE_IRQS_OFF
 755         la      %r2,SP_PTREGS(%r15)     # address of register-save area
 756         lh      %r3,__LC_EXT_INT_CODE   # get interruption code
 757         l       %r1,BASED(.Ldo_extint)
 758         basr    %r14,%r1
 759         b       BASED(io_return)
 760
 761 __critical_end:
 762
 763 /*
 764  * Machine check handler routines
 765  */
 766
 767         .globl mcck_int_handler
 768 mcck_int_handler:
 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 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 776         mvc     __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
 777         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
 778         tm      __LC_MCCK_CODE+5,0x02   # stored cpu timer value valid?
 779         bo      BASED(1f)
 780         la      %r14,__LC_SYNC_ENTER_TIMER
 781         clc     0(8,%r14),__LC_ASYNC_ENTER_TIMER
 782         bl      BASED(0f)
 783         la      %r14,__LC_ASYNC_ENTER_TIMER
 784 0:      clc     0(8,%r14),__LC_EXIT_TIMER
 785         bl      BASED(0f)
 786         la      %r14,__LC_EXIT_TIMER
 787 0:      clc     0(8,%r14),__LC_LAST_UPDATE_TIMER
 788         bl      BASED(0f)
 789         la      %r14,__LC_LAST_UPDATE_TIMER
 790 0:      spt     0(%r14)
 791         mvc     __LC_ASYNC_ENTER_TIMER(8),0(%r14)
 792 1:
 793 #endif
 794         tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
 795         bno     BASED(mcck_int_main)    # no -> skip cleanup critical
 796         tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
 797         bnz     BASED(mcck_int_main)    # from user -> load async stack
 798         clc     __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
 799         bhe     BASED(mcck_int_main)
 800         clc     __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
 801         bl      BASED(mcck_int_main)
 802         l       %r14,BASED(.Lcleanup_critical)
 803         basr    %r14,%r14
 804 mcck_int_main:
 805         l       %r14,__LC_PANIC_STACK   # are we already on the panic stack?
 806         slr     %r14,%r15
 807         sra     %r14,PAGE_SHIFT
 808         be      BASED(0f)
 809         l       %r15,__LC_PANIC_STACK   # load panic stack
 810 0:      CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
 811 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 812         tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
 813         bno     BASED(mcck_no_vtime)    # no -> skip cleanup critical
 814         tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
 815         bz      BASED(mcck_no_vtime)
 816         UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
 817         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 818         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
 819 mcck_no_vtime:
 820 #endif
 821         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
 822         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 823         l       %r1,BASED(.Ls390_mcck)
 824         basr    %r14,%r1                # call machine check handler
 825         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 826         bno     BASED(mcck_return)
 827         l       %r1,__LC_KERNEL_STACK   # switch to kernel stack
 828         s       %r1,BASED(.Lc_spsize)
 829         mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
 830         xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
 831         lr      %r15,%r1
 832         stosm   __SF_EMPTY(%r15),0x04   # turn dat on
 833         tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
 834         bno     BASED(mcck_return)
 835         TRACE_IRQS_OFF
 836         l       %r1,BASED(.Ls390_handle_mcck)
 837         basr    %r14,%r1                # call machine check handler
 838         TRACE_IRQS_ON
 839 mcck_return:
 840         mvc     __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
 841         ni      __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
 842 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 843         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
 844         tm      __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
 845         bno     BASED(0f)
 846         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15
 847         stpt    __LC_EXIT_TIMER
 848         lpsw    __LC_RETURN_MCCK_PSW    # back to caller
 849 0:
 850 #endif
 851         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15
 852         lpsw    __LC_RETURN_MCCK_PSW    # back to caller
 853
 854         RESTORE_ALL __LC_RETURN_MCCK_PSW,0
 855
 856 /*
 857  * Restart interruption handler, kick starter for additional CPUs
 858  */
 859 #ifdef CONFIG_SMP
 860         __CPUINIT
 861         .globl restart_int_handler
 862 restart_int_handler:
 863         l       %r15,__LC_SAVE_AREA+60  # load ksp
 864         lctl    %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
 865         lam     %a0,%a15,__LC_AREGS_SAVE_AREA
 866         lm      %r6,%r15,__SF_GPRS(%r15) # load registers from clone
 867         stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
 868         basr    %r14,0
 869         l       %r14,restart_addr-.(%r14)
 870         br      %r14                    # branch to start_secondary
 871 restart_addr:
 872         .long   start_secondary
 873         .previous
 874 #else
 875 /*
 876  * If we do not run with SMP enabled, let the new CPU crash ...
 877  */
 878         .globl restart_int_handler
 879 restart_int_handler:
 880         basr    %r1,0
 881 restart_base:
 882         lpsw    restart_crash-restart_base(%r1)
 883         .align  8
 884 restart_crash:
 885         .long   0x000a0000,0x00000000
 886 restart_go:
 887 #endif
 888
 889 #ifdef CONFIG_CHECK_STACK
 890 /*
 891  * The synchronous or the asynchronous stack overflowed. We are dead.
 892  * No need to properly save the registers, we are going to panic anyway.
 893  * Setup a pt_regs so that show_trace can provide a good call trace.
 894  */
 895 stack_overflow:
 896         l       %r15,__LC_PANIC_STACK   # change to panic stack
 897         sl      %r15,BASED(.Lc_spsize)
 898         mvc     SP_PSW(8,%r15),0(%r12)  # move user PSW to stack
 899         stm     %r0,%r11,SP_R0(%r15)    # store gprs %r0-%r11 to kernel stack
 900         la      %r1,__LC_SAVE_AREA
 901         ch      %r12,BASED(.L0x020)     # old psw addr == __LC_SVC_OLD_PSW ?
 902         be      BASED(0f)
 903         ch      %r12,BASED(.L0x028)     # old psw addr == __LC_PGM_OLD_PSW ?
 904         be      BASED(0f)
 905         la      %r1,__LC_SAVE_AREA+16
 906 0:      mvc     SP_R12(16,%r15),0(%r1)  # move %r12-%r15 to stack
 907         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
 908         l       %r1,BASED(1f)           # branch to kernel_stack_overflow
 909         la      %r2,SP_PTREGS(%r15)     # load pt_regs
 910         br      %r1
 911 1:      .long   kernel_stack_overflow
 912 #endif
 913
 914 cleanup_table_system_call:
 915         .long   system_call + 0x80000000, sysc_do_svc + 0x80000000
 916 cleanup_table_sysc_return:
 917         .long   sysc_return + 0x80000000, sysc_leave + 0x80000000
 918 cleanup_table_sysc_leave:
 919         .long   sysc_leave + 0x80000000, sysc_done + 0x80000000
 920 cleanup_table_sysc_work_loop:
 921         .long   sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000
 922 cleanup_table_io_return:
 923         .long   io_return + 0x80000000, io_leave + 0x80000000
 924 cleanup_table_io_leave:
 925         .long   io_leave + 0x80000000, io_done + 0x80000000
 926 cleanup_table_io_work_loop:
 927         .long   io_work_loop + 0x80000000, io_work_done + 0x80000000
 928
 929 cleanup_critical:
 930         clc     4(4,%r12),BASED(cleanup_table_system_call)
 931         bl      BASED(0f)
 932         clc     4(4,%r12),BASED(cleanup_table_system_call+4)
 933         bl      BASED(cleanup_system_call)
 934 0:
 935         clc     4(4,%r12),BASED(cleanup_table_sysc_return)
 936         bl      BASED(0f)
 937         clc     4(4,%r12),BASED(cleanup_table_sysc_return+4)
 938         bl      BASED(cleanup_sysc_return)
 939 0:
 940         clc     4(4,%r12),BASED(cleanup_table_sysc_leave)
 941         bl      BASED(0f)
 942         clc     4(4,%r12),BASED(cleanup_table_sysc_leave+4)
 943         bl      BASED(cleanup_sysc_leave)
 944 0:
 945         clc     4(4,%r12),BASED(cleanup_table_sysc_work_loop)
 946         bl      BASED(0f)
 947         clc     4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
 948         bl      BASED(cleanup_sysc_return)
 949 0:
 950         clc     4(4,%r12),BASED(cleanup_table_io_return)
 951         bl      BASED(0f)
 952         clc     4(4,%r12),BASED(cleanup_table_io_return+4)
 953         bl      BASED(cleanup_io_return)
 954 0:
 955         clc     4(4,%r12),BASED(cleanup_table_io_leave)
 956         bl      BASED(0f)
 957         clc     4(4,%r12),BASED(cleanup_table_io_leave+4)
 958         bl      BASED(cleanup_io_leave)
 959 0:
 960         clc     4(4,%r12),BASED(cleanup_table_io_work_loop)
 961         bl      BASED(0f)
 962         clc     4(4,%r12),BASED(cleanup_table_io_work_loop+4)
 963         bl      BASED(cleanup_io_return)
 964 0:
 965         br      %r14
 966
 967 cleanup_system_call:
 968         mvc     __LC_RETURN_PSW(8),0(%r12)
 969         c       %r12,BASED(.Lmck_old_psw)
 970         be      BASED(0f)
 971         la      %r12,__LC_SAVE_AREA+16
 972         b       BASED(1f)
 973 0:      la      %r12,__LC_SAVE_AREA+32
 974 1:
 975 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 976         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
 977         bh      BASED(0f)
 978         mvc     __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
 979 0:      clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
 980         bhe     BASED(cleanup_vtime)
 981 #endif
 982         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
 983         bh      BASED(0f)
 984         mvc     __LC_SAVE_AREA(16),0(%r12)
 985 0:      st      %r13,4(%r12)
 986         st      %r12,__LC_SAVE_AREA+48  # argh
 987         SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 988         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 989         l       %r12,__LC_SAVE_AREA+48  # argh
 990         st      %r15,12(%r12)
 991         lh      %r7,0x8a
 992 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 993 cleanup_vtime:
 994         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
 995         bhe     BASED(cleanup_stime)
 996         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 997 cleanup_stime:
 998         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
 999         bh      BASED(cleanup_update)
1000         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
1001 cleanup_update:
1002         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
1003 #endif
1004         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
1005         la      %r12,__LC_RETURN_PSW
1006         br      %r14
1007 cleanup_system_call_insn:
1008         .long   sysc_saveall + 0x80000000
1009 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1010         .long   system_call + 0x80000000
1011         .long   sysc_vtime + 0x80000000
1012         .long   sysc_stime + 0x80000000
1013         .long   sysc_update + 0x80000000
1014 #endif
1015
1016 cleanup_sysc_return:
1017         mvc     __LC_RETURN_PSW(4),0(%r12)
1018         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
1019         la      %r12,__LC_RETURN_PSW
1020         br      %r14
1021
1022 cleanup_sysc_leave:
1023         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn)
1024         be      BASED(2f)
1025 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1026         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1027         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
1028         be      BASED(2f)
1029 #endif
1030         mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
1031         c       %r12,BASED(.Lmck_old_psw)
1032         bne     BASED(0f)
1033         mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
1034         b       BASED(1f)
1035 0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
1036 1:      lm      %r0,%r11,SP_R0(%r15)
1037         l       %r15,SP_R15(%r15)
1038 2:      la      %r12,__LC_RETURN_PSW
1039         br      %r14
1040 cleanup_sysc_leave_insn:
1041         .long   sysc_done - 4 + 0x80000000
1042 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1043         .long   sysc_done - 8 + 0x80000000
1044 #endif
1045
1046 cleanup_io_return:
1047         mvc     __LC_RETURN_PSW(4),0(%r12)
1048         mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
1049         la      %r12,__LC_RETURN_PSW
1050         br      %r14
1051
1052 cleanup_io_leave:
1053         clc     4(4,%r12),BASED(cleanup_io_leave_insn)
1054         be      BASED(2f)
1055 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1056         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1057         clc     4(4,%r12),BASED(cleanup_io_leave_insn+4)
1058         be      BASED(2f)
1059 #endif
1060         mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
1061         c       %r12,BASED(.Lmck_old_psw)
1062         bne     BASED(0f)
1063         mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
1064         b       BASED(1f)
1065 0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
1066 1:      lm      %r0,%r11,SP_R0(%r15)
1067         l       %r15,SP_R15(%r15)
1068 2:      la      %r12,__LC_RETURN_PSW
1069         br      %r14
1070 cleanup_io_leave_insn:
1071         .long   io_done - 4 + 0x80000000
1072 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1073         .long   io_done - 8 + 0x80000000
1074 #endif
1075
1076 /*
1077  * Integer constants
1078  */
1079                 .align  4
1080 .Lc_spsize:     .long   SP_SIZE
1081 .Lc_overhead:   .long   STACK_FRAME_OVERHEAD
1082 .Lnr_syscalls:  .long   NR_syscalls
1083 .L0x018:        .short  0x018
1084 .L0x020:        .short  0x020
1085 .L0x028:        .short  0x028
1086 .L0x030:        .short  0x030
1087 .L0x038:        .short  0x038
1088 .Lc_1:          .long   1
1089
1090 /*
1091  * Symbol constants
1092  */
1093 .Ls390_mcck:    .long   s390_do_machine_check
1094 .Ls390_handle_mcck:
1095                 .long   s390_handle_mcck
1096 .Lmck_old_psw:  .long   __LC_MCK_OLD_PSW
1097 .Ldo_IRQ:       .long   do_IRQ
1098 .Ldo_extint:    .long   do_extint
1099 .Ldo_signal:    .long   do_signal
1100 .Ldo_notify_resume:
1101                 .long   do_notify_resume
1102 .Lhandle_per:   .long   do_single_step
1103 .Ldo_execve:    .long   do_execve
1104 .Lexecve_tail:  .long   execve_tail
1105 .Ljump_table:   .long   pgm_check_table
1106 .Lschedule:     .long   schedule
1107 #ifdef CONFIG_PREEMPT
1108 .Lpreempt_schedule_irq:
1109                 .long   preempt_schedule_irq
1110 #endif
1111 .Ltrace_entry:  .long   do_syscall_trace_enter
1112 .Ltrace_exit:   .long   do_syscall_trace_exit
1113 .Lschedtail:    .long   schedule_tail
1114 .Lsysc_table:   .long   sys_call_table
1115 #ifdef CONFIG_TRACE_IRQFLAGS
1116 .Ltrace_irq_on: .long   trace_hardirqs_on
1117 .Ltrace_irq_off:
1118                 .long   trace_hardirqs_off
1119 .Llockdep_sys_exit:
1120                 .long   lockdep_sys_exit
1121 #endif
1122 .Lcritical_start:
1123                 .long   __critical_start + 0x80000000
1124 .Lcritical_end:
1125                 .long   __critical_end + 0x80000000
1126 .Lcleanup_critical:
1127                 .long   cleanup_critical
1128
1129                 .section .rodata, "a"
1130 #define SYSCALL(esa,esame,emu)  .long esa
1131 sys_call_table:
1132 #include "syscalls.S"
1133 #undef SYSCALL