arch/s390/kernel/entry64.S

/*
 *  arch/s390/kernel/entry64.S
 *    S390 low-level entry points.
 *
 *    Copyright (C) IBM Corp. 1999,2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Hartmut Penner (hp@de.ibm.com),
 *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#include <linux/sys.h>
#include <linux/linkage.h>
#include <linux/config.h>
#include <asm/cache.h>
#include <asm/lowcore.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/page.h>

/*
 * Stack layout for the system_call stack entry.
 * The first few entries are identical to the user_regs_struct.
 */
SP_PTREGS    =  STACK_FRAME_OVERHEAD
SP_ARGS      =  STACK_FRAME_OVERHEAD + __PT_ARGS
SP_PSW       =  STACK_FRAME_OVERHEAD + __PT_PSW
SP_R0        =  STACK_FRAME_OVERHEAD + __PT_GPRS
SP_R1        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 8
SP_R2        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 16
SP_R3        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 24
SP_R4        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 32
SP_R5        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 40
SP_R6        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 48
SP_R7        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 56
SP_R8        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 64
SP_R9        =  STACK_FRAME_OVERHEAD + __PT_GPRS + 72
SP_R10       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 80
SP_R11       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 88
SP_R12       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 96
SP_R13       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 104
SP_R14       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 112
SP_R15       =  STACK_FRAME_OVERHEAD + __PT_GPRS + 120
SP_ORIG_R2   =  STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
SP_ILC       =  STACK_FRAME_OVERHEAD + __PT_ILC
SP_TRAP      =  STACK_FRAME_OVERHEAD + __PT_TRAP
SP_SIZE      =  STACK_FRAME_OVERHEAD + __PT_SIZE

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING)

#define BASED(name) name-system_call(%r13)

	.macro  STORE_TIMER lc_offset
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	stpt	\lc_offset
#endif
	.endm

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.macro  UPDATE_VTIME lc_from,lc_to,lc_sum
	lg	%r10,\lc_from
	slg	%r10,\lc_to
	alg	%r10,\lc_sum
	stg	%r10,\lc_sum
	.endm
#endif

/*
 * Register usage in interrupt handlers:
 *    R9  - pointer to current task structure
 *    R13 - pointer to literal pool
 *    R14 - return register for function calls
 *    R15 - kernel stack pointer
 */

        .macro  SAVE_ALL_BASE savearea
	stmg	%r12,%r15,\savearea
	larl	%r13,system_call
	.endm

        .macro  SAVE_ALL psworg,savearea,sync
	la	%r12,\psworg
	.if	\sync
	tm	\psworg+1,0x01		# test problem state bit
	jz	2f			# skip stack setup save
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.else
	tm	\psworg+1,0x01		# test problem state bit
	jnz	1f			# from user -> load kernel stack
	clc	\psworg+8(8),BASED(.Lcritical_end)
	jhe	0f
	clc	\psworg+8(8),BASED(.Lcritical_start)
	jl	0f
	brasl	%r14,cleanup_critical
	tm	1(%r12),0x01		# retest problem state after cleanup
	jnz	1f
0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the async. stack ?
	slgr	%r14,%r15
	srag	%r14,%r14,STACK_SHIFT
	jz	2f
1:	lg	%r15,__LC_ASYNC_STACK	# load async stack
	.endif
#ifdef CONFIG_CHECK_STACK
	j	3f
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	jz	stack_overflow
3:
#endif
2:
	.endm

	.macro	CREATE_STACK_FRAME psworg,savearea
	aghi    %r15,-SP_SIZE		# make room for registers & psw
	mvc     SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
	la	%r12,\psworg
	stg	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
	icm	%r12,12,__LC_SVC_ILC
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	st	%r12,SP_ILC(%r15)
	mvc	SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
	la	%r12,0
	stg	%r12,__SF_BACKCHAIN(%r15)
        .endm

	.macro	RESTORE_ALL psworg,sync
	mvc	\psworg(16),SP_PSW(%r15) # move user PSW to lowcore
	.if !\sync
	ni	\psworg+1,0xfd		# clear wait state bit
	.endif
	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
	lpswe	\psworg			# back to caller
	.endm

/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
        .globl  __switch_to
__switch_to:
	tm	__THREAD_per+4(%r3),0xe8 # is the new process using per ?
	jz	__switch_to_noper		# if not we're fine
        stctg   %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
        clc     __THREAD_per(24,%r3),__SF_EMPTY(%r15)
        je      __switch_to_noper            # we got away without bashing TLB's
        lctlg   %c9,%c11,__THREAD_per(%r3)	# Nope we didn't
__switch_to_noper:
	lg	%r4,__THREAD_info(%r2)              # get thread_info of prev
	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
	jz	__switch_to_no_mcck
	ni	__TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
	lg	%r4,__THREAD_info(%r3)		    # get thread_info of next
	oi	__TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
__switch_to_no_mcck:
        stmg    %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
	stg	%r15,__THREAD_ksp(%r2)	# store kernel stack to prev->tss.ksp
	lg	%r15,__THREAD_ksp(%r3)	# load kernel stack from next->tss.ksp
        lmg     %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
	stg	%r3,__LC_CURRENT	# __LC_CURRENT = current task struct
	lctl	%c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
	lg	%r3,__THREAD_info(%r3)  # load thread_info from task struct
	stg	%r3,__LC_THREAD_INFO
	aghi	%r3,STACK_SIZE
	stg	%r3,__LC_KERNEL_STACK	# __LC_KERNEL_STACK = new kernel stack
	br	%r14

__critical_start:
/*
 * SVC interrupt handler routine. System calls are synchronous events and
 * are executed with interrupts enabled.
 */

	.globl  system_call
system_call:
	STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
        SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
        CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	llgh    %r7,__LC_SVC_INT_CODE # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	sysc_do_svc
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
sysc_stime:
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
sysc_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
#endif
sysc_do_svc:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
        slag    %r7,%r7,2         # *4 and test for svc 0
	jnz	sysc_nr_ok
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	jnl	sysc_nr_ok
	lgfr	%r7,%r1           # clear high word in r1
	slag    %r7,%r7,2         # svc 0: system call number in %r1
sysc_nr_ok:
	mvc	SP_ARGS(8,%r15),SP_R7(%r15)
sysc_do_restart:
	larl    %r10,sys_call_table
#ifdef CONFIG_COMPAT
	tm	__TI_flags+5(%r9),(_TIF_31BIT>>16)  # running in 31 bit mode ?
	jno	sysc_noemu
	larl    %r10,sys_call_table_emu  # use 31 bit emulation system calls
sysc_noemu:
#endif
	tm	__TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        lgf     %r8,0(%r7,%r10)   # load address of system call routine
        jnz     sysc_tracesys
        basr    %r14,%r8          # call sys_xxxx
        stg     %r2,SP_R2(%r15)   # store return value (change R2 on stack)
                                  # ATTENTION: check sys_execve_glue before
                                  # changing anything here !!

sysc_return:
        tm      SP_PSW+1(%r15),0x01    # returning to user ?
        jno     sysc_leave
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jnz	sysc_work         # there is work to do (signals etc.)
sysc_leave:
        RESTORE_ALL __LC_RETURN_PSW,1

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jz	sysc_leave        # there is no work to do
#
# One of the work bits is on. Find out which one.
#
sysc_work:
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	sysc_mcck_pending
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	sysc_reschedule
	tm	__TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	jnz	sysc_sigpending
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_leave

#
# _TIF_NEED_RESCHED is set, call schedule
#	
sysc_reschedule:        
	larl    %r14,sysc_work_loop
        jg      schedule            # return point is sysc_return

#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
	larl	%r14,sysc_work_loop
	jg	s390_handle_mcck    # TIF bit will be cleared by handler

#
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
#
sysc_sigpending:     
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
        la      %r2,SP_PTREGS(%r15) # load pt_regs
	brasl	%r14,do_signal    # call do_signal
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_work_loop

#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
sysc_restart:
	ni	__TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
	lg	%r7,SP_R2(%r15)        # load new svc number
        slag    %r7,%r7,2              # *4
	mvc	SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
	lmg	%r2,%r6,SP_R2(%r15)    # load svc arguments
	j	sysc_do_restart        # restart svc

#
# _TIF_SINGLE_STEP is set, call do_single_step
#
sysc_singlestep:
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
	lhi	%r0,__LC_PGM_OLD_PSW
	sth	%r0,SP_TRAP(%r15)	# set trap indication to pgm check
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_return	# load adr. of system return
	jg	do_single_step		# branch to do_sigtrap


#
# call syscall_trace before and after system call
# special linkage: %r12 contains the return address for trace_svc
#
sysc_tracesys:
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	la	%r3,0
	srl	%r7,2
	stg     %r7,SP_R2(%r15)
        brasl   %r14,syscall_trace
	lghi	%r0,NR_syscalls
	clg	%r0,SP_R2(%r15)
	jnh	sysc_tracenogo
	lg	%r7,SP_R2(%r15)   # strace might have changed the
	sll     %r7,2             #  system call
	lgf	%r8,0(%r7,%r10)
sysc_tracego:
	lmg     %r3,%r6,SP_R3(%r15)
	lg      %r2,SP_ORIG_R2(%r15)
        basr    %r14,%r8            # call sys_xxx
        stg     %r2,SP_R2(%r15)     # store return value
sysc_tracenogo:
	tm	__TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        jz      sysc_return
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	la	%r3,1
	larl	%r14,sysc_return    # return point is sysc_return
	jg	syscall_trace

#
# a new process exits the kernel with ret_from_fork
#
        .globl  ret_from_fork
ret_from_fork:
	lg	%r13,__LC_SVC_NEW_PSW+8
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
	jo	0f
	stg	%r15,SP_R15(%r15)	# store stack pointer for new kthread
0:	brasl   %r14,schedule_tail
        stosm   24(%r15),0x03     # reenable interrupts
	j	sysc_return

#
# clone, fork, vfork, exec and sigreturn need glue,
# because they all expect pt_regs as parameter,
# but are called with different parameter.
# return-address is set up above
#
sys_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_clone              # branch to sys_clone

#ifdef CONFIG_COMPAT
sys32_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys32_clone            # branch to sys32_clone
#endif

sys_fork_glue:  
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_fork               # branch to sys_fork

sys_vfork_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_vfork              # branch to sys_vfork

sys_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
	lgr     %r12,%r14             # save return address
        brasl   %r14,sys_execve       # call sys_execve
        ltgr    %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       6(%r12)               # SKIP STG 2,SP_R2(15) in
                                      # system_call/sysc_tracesys
#ifdef CONFIG_COMPAT
sys32_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
	lgr     %r12,%r14             # save return address
        brasl   %r14,sys32_execve     # call sys32_execve
        ltgr    %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       6(%r12)               # SKIP STG 2,SP_R2(15) in
                                      # system_call/sysc_tracesys
#endif

sys_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_sigreturn         # branch to sys_sigreturn

#ifdef CONFIG_COMPAT
sys32_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_sigreturn       # branch to sys32_sigreturn
#endif

sys_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_rt_sigreturn      # branch to sys_sigreturn

#ifdef CONFIG_COMPAT
sys32_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_rt_sigreturn    # branch to sys32_sigreturn
#endif

sys_sigaltstack_glue:
        la      %r4,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_sigaltstack       # branch to sys_sigreturn

#ifdef CONFIG_COMPAT
sys32_sigaltstack_glue:
        la      %r4,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_sigaltstack_wrapper # branch to sys_sigreturn
#endif

/*
 * Program check handler routine
 */

        .globl  pgm_check_handler
pgm_check_handler:
/*
 * First we need to check for a special case:
 * Single stepping an instruction that disables the PER event mask will
 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
 * For a single stepped SVC the program check handler gets control after
 * the SVC new PSW has been loaded. But we want to execute the SVC first and
 * then handle the PER event. Therefore we update the SVC old PSW to point
 * to the pgm_check_handler and branch to the SVC handler after we checked
 * if we have to load the kernel stack register.
 * For every other possible cause for PER event without the PER mask set
 * we just ignore the PER event (FIXME: is there anything we have to do
 * for LPSW?).
 */
	STORE_TIMER __LC_SYNC_ENTER_TIMER
	SAVE_ALL_BASE __LC_SAVE_AREA
        tm      __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
        jnz     pgm_per                  # got per exception -> special case
	SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lgf     %r3,__LC_PGM_ILC	 # load program interruption code
	lghi	%r8,0x7f
	ngr	%r8,%r3
pgm_do_call:
        sll     %r8,3
        larl    %r1,pgm_check_table
        lg      %r1,0(%r8,%r1)		 # load address of handler routine
        la      %r2,SP_PTREGS(%r15)	 # address of register-save area
	larl	%r14,sysc_return
        br      %r1			 # branch to interrupt-handler

#
# handle per exception
#
pgm_per:
        tm      __LC_PGM_OLD_PSW,0x40    # test if per event recording is on
        jnz     pgm_per_std              # ok, normal per event from user space
# ok its one of the special cases, now we need to find out which one
        clc     __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
        je      pgm_svcper
# no interesting special case, ignore PER event
	lmg	%r12,%r15,__LC_SAVE_AREA
	lpswe   __LC_PGM_OLD_PSW

#
# Normal per exception
#
pgm_per_std:
	SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime2
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime2:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
	lgf     %r3,__LC_PGM_ILC	 # load program interruption code
	lghi	%r8,0x7f
	ngr	%r8,%r3			 # clear per-event-bit and ilc
	je	sysc_return
	j	pgm_do_call

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime3
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime3:
#endif
	llgh    %r7,__LC_SVC_INT_CODE	# get svc number from lowcore
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	j	sysc_do_svc

/*
 * IO interrupt handler routine
 */
        .globl io_int_handler
io_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
        SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	io_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
io_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
        la      %r2,SP_PTREGS(%r15)    # address of register-save area
	brasl   %r14,do_IRQ            # call standard irq handler

io_return:
        tm      SP_PSW+1(%r15),0x01    # returning to user ?
#ifdef CONFIG_PREEMPT
	jno     io_preempt             # no -> check for preemptive scheduling
#else
        jno     io_leave               # no-> skip resched & signal
#endif
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jnz	io_work                # there is work to do (signals etc.)
io_leave:
        RESTORE_ALL __LC_RETURN_PSW,0
io_done:

#ifdef CONFIG_PREEMPT
io_preempt:
	icm	%r0,15,__TI_precount(%r9)	
	jnz     io_leave
	# switch to kernel stack
	lg	%r1,SP_R15(%r15)
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
        xc      __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
io_resume_loop:
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jno	io_leave
	larl    %r1,.Lc_pactive
	mvc     __TI_precount(4,%r9),0(%r1)
        stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
	brasl   %r14,schedule          # call schedule
        stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
	xc      __TI_precount(4,%r9),__TI_precount(%r9)
	j	io_resume_loop
#endif

#
# switch to kernel stack, then check TIF bits
#
io_work:
	lg	%r1,__LC_KERNEL_STACK
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
        xc      __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
#
# One of the work bits is on. Find out which one.
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
#	       and _TIF_MCCK_PENDING
#
io_work_loop:
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	io_mcck_pending
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	io_reschedule
	tm	__TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	jnz	io_sigpending
	j	io_leave

#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	larl	%r14,io_work_loop
	jg	s390_handle_mcck	# TIF bit will be cleared by handler

#
# _TIF_NEED_RESCHED is set, call schedule
#	
io_reschedule:        
	stosm   __SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl   %r14,schedule		# call scheduler
	stnsm   __SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jz	io_leave		# there is no work to do
	j	io_work_loop

#
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
#
io_sigpending:     
	stosm   __SF_EMPTY(%r15),0x03	# reenable interrupts
	la      %r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,do_signal		# call do_signal
	stnsm   __SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	j	io_work_loop

/*
 * External interrupt handler routine
 */
        .globl  ext_int_handler
ext_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
        SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	ext_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
ext_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)    # address of register-save area
	llgh	%r3,__LC_EXT_INT_CODE  # get interruption code
	brasl   %r14,do_extint
	j	io_return

__critical_end:

/*
 * Machine check handler routines
 */
        .globl mcck_int_handler
mcck_int_handler:
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r1)
  	lmg     %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
	SAVE_ALL_BASE __LC_SAVE_AREA+64
	la	%r12,__LC_MCK_OLD_PSW
	tm	__LC_MCCK_CODE,0x80     # system damage?
	jo	mcck_int_main		# yes -> rest of mcck code invalid
	tm	__LC_MCCK_CODE+5,0x02   # stored cpu timer value valid?
	jo	0f
	spt	__LC_LAST_UPDATE_TIMER
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER
#endif
0:	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
	jno	mcck_int_main		# no -> skip cleanup critical
	tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
	jnz	mcck_int_main		# from user -> load kernel stack
	clc	__LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
	jhe	mcck_int_main
	clc     __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
	jl	mcck_int_main
	brasl   %r14,cleanup_critical
mcck_int_main:
	lg      %r14,__LC_PANIC_STACK   # are we already on the panic stack?
	slgr	%r14,%r15
	srag	%r14,%r14,PAGE_SHIFT
	jz	0f
	lg      %r15,__LC_PANIC_STACK   # load panic stack
0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
	jno	mcck_no_vtime		# no -> no timer update
	tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
	jz	mcck_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
mcck_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,s390_do_machine_check
	tm	SP_PSW+1(%r15),0x01     # returning to user ?
	jno	mcck_return
	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jno	mcck_return
	brasl	%r14,s390_handle_mcck
mcck_return:
        RESTORE_ALL __LC_RETURN_MCCK_PSW,0

#ifdef CONFIG_SMP
/*
 * Restart interruption handler, kick starter for additional CPUs
 */
        .globl restart_int_handler
restart_int_handler:
        lg      %r15,__LC_SAVE_AREA+120 # load ksp
        lghi    %r10,__LC_CREGS_SAVE_AREA
        lctlg   %c0,%c15,0(%r10) # get new ctl regs
        lghi    %r10,__LC_AREGS_SAVE_AREA
        lam     %a0,%a15,0(%r10)
        lmg     %r6,%r15,__SF_GPRS(%r15) # load registers from clone
        stosm   __SF_EMPTY(%r15),0x04    # now we can turn dat on
	jg      start_secondary
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
        .globl restart_int_handler
restart_int_handler:
        basr    %r1,0
restart_base:
        lpswe   restart_crash-restart_base(%r1)
        .align 8
restart_crash:
        .long  0x000a0000,0x00000000,0x00000000,0x00000000
restart_go:
#endif

#ifdef CONFIG_CHECK_STACK
/*
 * The synchronous or the asynchronous stack overflowed. We are dead.
 * No need to properly save the registers, we are going to panic anyway.
 * Setup a pt_regs so that show_trace can provide a good call trace.
 */
stack_overflow:
	lg	%r15,__LC_PANIC_STACK	# change to panic stack
	aghi	%r1,-SP_SIZE
	mvc	SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	la	%r1,__LC_SAVE_AREA
	chi	%r12,__LC_SVC_OLD_PSW
	je	0f
	chi	%r12,__LC_PGM_OLD_PSW
	je	0f
	la	%r1,__LC_SAVE_AREA+16
0:	mvc	SP_R12(32,%r15),0(%r1)  # move %r12-%r15 to stack
        xc      __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
        la      %r2,SP_PTREGS(%r15)	# load pt_regs
	jg	kernel_stack_overflow
#endif

cleanup_table_system_call:
	.quad	system_call, sysc_do_svc
cleanup_table_sysc_return:
	.quad	sysc_return, sysc_leave
cleanup_table_sysc_leave:
	.quad	sysc_leave, sysc_work_loop
cleanup_table_sysc_work_loop:
	.quad	sysc_work_loop, sysc_reschedule
cleanup_table_io_leave:
	.quad	io_leave, io_done
cleanup_table_io_work_loop:
	.quad	io_work_loop, io_mcck_pending

cleanup_critical:
	clc	8(8,%r12),BASED(cleanup_table_system_call)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_system_call+8)
	jl	cleanup_system_call
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_return)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_return+8)
	jl	cleanup_sysc_return
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave+8)
	jl	cleanup_sysc_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
	jl	cleanup_sysc_return
0:
	clc	8(8,%r12),BASED(cleanup_table_io_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_leave+8)
	jl	cleanup_io_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop+8)
	jl	cleanup_io_return
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(16),0(%r12)
	cghi	%r12,__LC_MCK_OLD_PSW
	je	0f
	la	%r12,__LC_SAVE_AREA+32
	j	1f
0:	la	%r12,__LC_SAVE_AREA+64
1:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
	jh	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
	jhe	cleanup_vtime
#endif
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
	jh	0f
	mvc	__LC_SAVE_AREA(32),0(%r12)
0:	stg	%r13,8(%r12)
	stg	%r12,__LC_SAVE_AREA+96	# argh
	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	lg	%r12,__LC_SAVE_AREA+96	# argh
	stg	%r15,24(%r12)
	llgh	%r7,__LC_SVC_INT_CODE
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
cleanup_vtime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
	jhe	cleanup_stime
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	cleanup_novtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
cleanup_stime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
	jh	cleanup_update
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
cleanup_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
cleanup_novtime:
#endif
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_system_call_insn:
	.quad	sysc_saveall
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad   system_call
	.quad   sysc_vtime
	.quad   sysc_stime
	.quad   sysc_update
#endif

cleanup_sysc_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_sysc_leave:
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn)
	je	2f
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
	je	2f
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	sysc_leave + 16
#endif
	.quad	sysc_leave + 12

cleanup_io_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_io_leave:
	clc	8(8,%r12),BASED(cleanup_io_leave_insn)
	je	2f
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_io_leave_insn+8)
	je	2f
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_io_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	io_leave + 20
#endif
	.quad	io_leave + 16

/*
 * Integer constants
 */
               .align 4
.Lconst:
.Lc_pactive:   .long  PREEMPT_ACTIVE
.Lnr_syscalls: .long  NR_syscalls
.L0x0130:      .short 0x130
.L0x0140:      .short 0x140
.L0x0150:      .short 0x150
.L0x0160:      .short 0x160
.L0x0170:      .short 0x170
.Lcritical_start:
               .quad  __critical_start
.Lcritical_end:
               .quad  __critical_end

#define SYSCALL(esa,esame,emu)	.long esame
	.globl  sys_call_table
sys_call_table:
#include "syscalls.S"
#undef SYSCALL

#ifdef CONFIG_COMPAT

#define SYSCALL(esa,esame,emu)	.long emu
	.globl  sys_call_table_emu
sys_call_table_emu:
#include "syscalls.S"
#undef SYSCALL
#endif