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/*
 *    S390 low-level entry points.
 *
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 *    Copyright IBM Corp. 1999, 2012
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 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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 *		 Hartmut Penner (hp@de.ibm.com),
 *		 Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
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 */

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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
#include <asm/page.h>
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#include <asm/sigp.h>
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#include <asm/irq.h>
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__PT_R0      =	__PT_GPRS
__PT_R1      =	__PT_GPRS + 8
__PT_R2      =	__PT_GPRS + 16
__PT_R3      =	__PT_GPRS + 24
__PT_R4      =	__PT_GPRS + 32
__PT_R5      =	__PT_GPRS + 40
__PT_R6      =	__PT_GPRS + 48
__PT_R7      =	__PT_GPRS + 56
__PT_R8      =	__PT_GPRS + 64
__PT_R9      =	__PT_GPRS + 72
__PT_R10     =	__PT_GPRS + 80
__PT_R11     =	__PT_GPRS + 88
__PT_R12     =	__PT_GPRS + 96
__PT_R13     =	__PT_GPRS + 104
__PT_R14     =	__PT_GPRS + 112
__PT_R15     =	__PT_GPRS + 120
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STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT
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STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
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_TIF_WORK	= (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
		   _TIF_UPROBE)
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_TIF_TRACE	= (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
		   _TIF_SYSCALL_TRACEPOINT)
_CIF_WORK	= (_CIF_MCCK_PENDING | _CIF_ASCE)
_PIF_WORK	= (_PIF_PER_TRAP)
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#define BASED(name) name-system_call(%r13)

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	.macro	TRACE_IRQS_ON
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#ifdef CONFIG_TRACE_IRQFLAGS
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	basr	%r2,%r0
	brasl	%r14,trace_hardirqs_on_caller
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#endif
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	.endm

	.macro	TRACE_IRQS_OFF
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#ifdef CONFIG_TRACE_IRQFLAGS
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	basr	%r2,%r0
	brasl	%r14,trace_hardirqs_off_caller
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#endif
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	.endm
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	.macro	LOCKDEP_SYS_EXIT
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#ifdef CONFIG_LOCKDEP
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
	jz	.+10
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	brasl	%r14,lockdep_sys_exit
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#endif
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	.endm

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	.macro LPP newpp
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#if IS_ENABLED(CONFIG_KVM)
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	tm	__LC_MACHINE_FLAGS+6,0x20	# MACHINE_FLAG_LPP
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	jz	.+8
	.insn	s,0xb2800000,\newpp
#endif
	.endm
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	.macro	HANDLE_SIE_INTERCEPT scratch,reason
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#if IS_ENABLED(CONFIG_KVM)
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	tmhh	%r8,0x0001		# interrupting from user ?
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	jnz	.+62
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	lgr	\scratch,%r9
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	slg	\scratch,BASED(.Lsie_critical)
	clg	\scratch,BASED(.Lsie_critical_length)
	.if	\reason==1
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	# Some program interrupts are suppressing (e.g. protection).
	# We must also check the instruction after SIE in that case.
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	# do_protection_exception will rewind to .Lrewind_pad
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	jh	.+42
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	.else
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	jhe	.+42
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	.endif
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	lg	%r14,__SF_EMPTY(%r15)		# get control block pointer
	LPP	__SF_EMPTY+16(%r15)		# set host id
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	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
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	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
	larl	%r9,sie_exit			# skip forward to sie_exit
	mvi	__SF_EMPTY+31(%r15),\reason	# set exit reason
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#endif
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	.endm

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	.macro	CHECK_STACK stacksize,savearea
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#ifdef CONFIG_CHECK_STACK
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	tml	%r15,\stacksize - CONFIG_STACK_GUARD
	lghi	%r14,\savearea
	jz	stack_overflow
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#endif
	.endm

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	.macro	SWITCH_ASYNC savearea,stack,shift
	tmhh	%r8,0x0001		# interrupting from user ?
	jnz	1f
	lgr	%r14,%r9
	slg	%r14,BASED(.Lcritical_start)
	clg	%r14,BASED(.Lcritical_length)
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	jhe	0f
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	lghi	%r11,\savearea		# inside critical section, do cleanup
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	brasl	%r14,cleanup_critical
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	tmhh	%r8,0x0001		# retest problem state after cleanup
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	jnz	1f
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0:	lg	%r14,\stack		# are we already on the target stack?
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	slgr	%r14,%r15
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	srag	%r14,%r14,\shift
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	jnz	1f
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	CHECK_STACK 1<<\shift,\savearea
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	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
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	j	2f
1:	lg	%r15,\stack		# load target stack
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2:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
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	.endm
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	.macro UPDATE_VTIME scratch,enter_timer
	lg	\scratch,__LC_EXIT_TIMER
	slg	\scratch,\enter_timer
	alg	\scratch,__LC_USER_TIMER
	stg	\scratch,__LC_USER_TIMER
	lg	\scratch,__LC_LAST_UPDATE_TIMER
	slg	\scratch,__LC_EXIT_TIMER
	alg	\scratch,__LC_SYSTEM_TIMER
	stg	\scratch,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),\enter_timer
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	.endm

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	.macro	LAST_BREAK scratch
	srag	\scratch,%r10,23
	jz	.+10
	stg	%r10,__TI_last_break(%r12)
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	.endm

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	.macro REENABLE_IRQS
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	stg	%r8,__LC_RETURN_PSW
	ni	__LC_RETURN_PSW,0xbf
	ssm	__LC_RETURN_PSW
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	.endm

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	.macro STCK savearea
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#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
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	.insn	s,0xb27c0000,\savearea		# store clock fast
#else
	.insn	s,0xb2050000,\savearea		# store clock
#endif
	.endm

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	.section .kprobes.text, "ax"

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/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
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ENTRY(__switch_to)
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	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
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	lgr	%r1,%r2
	aghi	%r1,__TASK_thread		# thread_struct of prev task
	lg	%r4,__TASK_thread_info(%r2)	# get thread_info of prev
	lg	%r5,__TASK_thread_info(%r3)	# get thread_info of next
	stg	%r15,__THREAD_ksp(%r1)		# store kernel stack of prev
	lgr	%r1,%r3
	aghi	%r1,__TASK_thread		# thread_struct of next task
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	lgr	%r15,%r5
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	aghi	%r15,STACK_INIT			# end of kernel stack of next
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	stg	%r3,__LC_CURRENT		# store task struct of next
	stg	%r5,__LC_THREAD_INFO		# store thread info of next
	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack
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	lg	%r15,__THREAD_ksp(%r1)		# load kernel stack of next
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	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
	mvc	__LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
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	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
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	br	%r14

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

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ENTRY(system_call)
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	stpt	__LC_SYNC_ENTER_TIMER
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.Lsysc_stmg:
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	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
	lg	%r10,__LC_LAST_BREAK
	lg	%r12,__LC_THREAD_INFO
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	lghi	%r14,_PIF_SYSCALL
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.Lsysc_per:
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	lg	%r15,__LC_KERNEL_STACK
	la	%r11,STACK_FRAME_OVERHEAD(%r15)	# pointer to pt_regs
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.Lsysc_vtime:
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	UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
	LAST_BREAK %r13
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
	mvc	__PT_PSW(16,%r11),__LC_SVC_OLD_PSW
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	mvc	__PT_INT_CODE(4,%r11),__LC_SVC_ILC
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	stg	%r14,__PT_FLAGS(%r11)
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.Lsysc_do_svc:
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	lg	%r10,__TI_sysc_table(%r12)	# address of system call table
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	llgh	%r8,__PT_INT_CODE+2(%r11)
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	slag	%r8,%r8,2			# shift and test for svc 0
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	jnz	.Lsysc_nr_ok
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	# svc 0: system call number in %r1
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	llgfr	%r1,%r1				# clear high word in r1
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	cghi	%r1,NR_syscalls
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	jnl	.Lsysc_nr_ok
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	sth	%r1,__PT_INT_CODE+2(%r11)
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	slag	%r8,%r1,2
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.Lsysc_nr_ok:
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	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	stg	%r2,__PT_ORIG_GPR2(%r11)
	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
	lgf	%r9,0(%r8,%r10)			# get system call add.
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	tm	__TI_flags+7(%r12),_TIF_TRACE
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	jnz	.Lsysc_tracesys
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	basr	%r14,%r9			# call sys_xxxx
	stg	%r2,__PT_R2(%r11)		# store return value
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.Lsysc_return:
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	LOCKDEP_SYS_EXIT
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.Lsysc_tif:
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	tm	__PT_PSW+1(%r11),0x01		# returning to user ?
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	jno	.Lsysc_restore
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	tm	__PT_FLAGS+7(%r11),_PIF_WORK
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	jnz	.Lsysc_work
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	tm	__TI_flags+7(%r12),_TIF_WORK
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	jnz	.Lsysc_work			# check for work
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	tm	__LC_CPU_FLAGS+7,_CIF_WORK
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	jnz	.Lsysc_work
.Lsysc_restore:
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	lg	%r14,__LC_VDSO_PER_CPU
	lmg	%r0,%r10,__PT_R0(%r11)
	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
	stpt	__LC_EXIT_TIMER
	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
	lmg	%r11,%r15,__PT_R11(%r11)
	lpswe	__LC_RETURN_PSW
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.Lsysc_done:
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#
# One of the work bits is on. Find out which one.
#
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.Lsysc_work:
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	tm	__LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
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	jo	.Lsysc_mcck_pending
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	tm	__TI_flags+7(%r12),_TIF_NEED_RESCHED
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	jo	.Lsysc_reschedule
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#ifdef CONFIG_UPROBES
	tm	__TI_flags+7(%r12),_TIF_UPROBE
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	jo	.Lsysc_uprobe_notify
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#endif
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	tm	__PT_FLAGS+7(%r11),_PIF_PER_TRAP
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	jo	.Lsysc_singlestep
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	tm	__TI_flags+7(%r12),_TIF_SIGPENDING
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	jo	.Lsysc_sigpending
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	tm	__TI_flags+7(%r12),_TIF_NOTIFY_RESUME
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	jo	.Lsysc_notify_resume
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	tm	__LC_CPU_FLAGS+7,_CIF_ASCE
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	jo	.Lsysc_uaccess
	j	.Lsysc_return		# beware of critical section cleanup
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#
# _TIF_NEED_RESCHED is set, call schedule
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#
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.Lsysc_reschedule:
	larl	%r14,.Lsysc_return
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	jg	schedule
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#
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# _CIF_MCCK_PENDING is set, call handler
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#
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.Lsysc_mcck_pending:
	larl	%r14,.Lsysc_return
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	jg	s390_handle_mcck	# TIF bit will be cleared by handler
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#
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# _CIF_ASCE is set, load user space asce
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#
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.Lsysc_uaccess:
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	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE
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	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
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	j	.Lsysc_return
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#
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# _TIF_SIGPENDING is set, call do_signal
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#
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.Lsysc_sigpending:
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	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,do_signal
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	tm	__PT_FLAGS+7(%r11),_PIF_SYSCALL
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	jno	.Lsysc_return
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	lmg	%r2,%r7,__PT_R2(%r11)	# load svc arguments
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	lg	%r10,__TI_sysc_table(%r12)	# address of system call table
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	lghi	%r8,0			# svc 0 returns -ENOSYS
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	llgh	%r1,__PT_INT_CODE+2(%r11)	# load new svc number
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	cghi	%r1,NR_syscalls
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	jnl	.Lsysc_nr_ok		# invalid svc number -> do svc 0
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	slag	%r8,%r1,2
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	j	.Lsysc_nr_ok		# restart svc
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#
# _TIF_NOTIFY_RESUME is set, call do_notify_resume
#
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.Lsysc_notify_resume:
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	lgr	%r2,%r11		# pass pointer to pt_regs
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	larl	%r14,.Lsysc_return
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	jg	do_notify_resume
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#
# _TIF_UPROBE is set, call uprobe_notify_resume
#
#ifdef CONFIG_UPROBES
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.Lsysc_uprobe_notify:
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	lgr	%r2,%r11		# pass pointer to pt_regs
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	larl	%r14,.Lsysc_return
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	jg	uprobe_notify_resume
#endif

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#
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# _PIF_PER_TRAP is set, call do_per_trap
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#
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.Lsysc_singlestep:
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	ni	__PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
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	lgr	%r2,%r11		# pass pointer to pt_regs
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	larl	%r14,.Lsysc_return
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	jg	do_per_trap
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#
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# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
# and after the system call
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#
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.Lsysc_tracesys:
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	lgr	%r2,%r11		# pass pointer to pt_regs
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	la	%r3,0
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	llgh	%r0,__PT_INT_CODE+2(%r11)
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	stg	%r0,__PT_R2(%r11)
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	brasl	%r14,do_syscall_trace_enter
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	lghi	%r0,NR_syscalls
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	clgr	%r0,%r2
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	jnh	.Lsysc_tracenogo
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	sllg	%r8,%r2,2
	lgf	%r9,0(%r8,%r10)
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.Lsysc_tracego:
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	lmg	%r3,%r7,__PT_R3(%r11)
	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
	lg	%r2,__PT_ORIG_GPR2(%r11)
	basr	%r14,%r9		# call sys_xxx
	stg	%r2,__PT_R2(%r11)	# store return value
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.Lsysc_tracenogo:
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	tm	__TI_flags+7(%r12),_TIF_TRACE
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	jz	.Lsysc_return
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	lgr	%r2,%r11		# pass pointer to pt_regs
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	larl	%r14,.Lsysc_return
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	jg	do_syscall_trace_exit
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#
# a new process exits the kernel with ret_from_fork
#
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ENTRY(ret_from_fork)
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	la	%r11,STACK_FRAME_OVERHEAD(%r15)
	lg	%r12,__LC_THREAD_INFO
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	brasl	%r14,schedule_tail
	TRACE_IRQS_ON
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
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	tm	__PT_PSW+1(%r11),0x01	# forking a kernel thread ?
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	jne	.Lsysc_tracenogo
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	# it's a kernel thread
	lmg	%r9,%r10,__PT_R9(%r11)	# load gprs
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ENTRY(kernel_thread_starter)
	la	%r2,0(%r10)
	basr	%r14,%r9
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	j	.Lsysc_tracenogo
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/*
 * Program check handler routine
 */

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ENTRY(pgm_check_handler)
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	stpt	__LC_SYNC_ENTER_TIMER
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	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
	lg	%r10,__LC_LAST_BREAK
	lg	%r12,__LC_THREAD_INFO
	larl	%r13,system_call
	lmg	%r8,%r9,__LC_PGM_OLD_PSW
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	HANDLE_SIE_INTERCEPT %r14,1
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	tmhh	%r8,0x0001		# test problem state bit
	jnz	1f			# -> fault in user space
	tmhh	%r8,0x4000		# PER bit set in old PSW ?
	jnz	0f			# -> enabled, can't be a double fault
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
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	jnz	.Lpgm_svcper		# -> single stepped svc
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0:	CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
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	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
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	j	2f
1:	UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
	LAST_BREAK %r14
	lg	%r15,__LC_KERNEL_STACK
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	lg	%r14,__TI_task(%r12)
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	aghi	%r14,__TASK_thread	# pointer to thread_struct
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	lghi	%r13,__LC_PGM_TDB
	tm	__LC_PGM_ILC+2,0x02	# check for transaction abort
	jz	2f
	mvc	__THREAD_trap_tdb(256,%r14),0(%r13)
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2:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
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	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
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	mvc	__PT_INT_CODE(4,%r11),__LC_PGM_ILC
	mvc	__PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
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	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
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	stg	%r10,__PT_ARGS(%r11)
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
	jz	0f
	tmhh	%r8,0x0001		# kernel per event ?
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	jz	.Lpgm_kprobe
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	oi	__PT_FLAGS+7(%r11),_PIF_PER_TRAP
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	mvc	__THREAD_per_address(8,%r14),__LC_PER_ADDRESS
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	mvc	__THREAD_per_cause(2,%r14),__LC_PER_CODE
	mvc	__THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
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0:	REENABLE_IRQS
446
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
447
	larl	%r1,pgm_check_table
M
Martin Schwidefsky 已提交
448 449
	llgh	%r10,__PT_INT_CODE+2(%r11)
	nill	%r10,0x007f
450
	sll	%r10,2
451
	je	.Lsysc_return
452
	lgf	%r1,0(%r10,%r1)		# load address of handler routine
453
	lgr	%r2,%r11		# pass pointer to pt_regs
454
	basr	%r14,%r1		# branch to interrupt-handler
455
	j	.Lsysc_return
L
Linus Torvalds 已提交
456 457

#
458
# PER event in supervisor state, must be kprobes
L
Linus Torvalds 已提交
459
#
460
.Lpgm_kprobe:
461 462 463 464
	REENABLE_IRQS
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,do_per_trap
465
	j	.Lsysc_return
L
Linus Torvalds 已提交
466

M
Michael Grundy 已提交
467
#
468
# single stepped system call
M
Michael Grundy 已提交
469
#
470
.Lpgm_svcper:
471
	mvc	__LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
472
	larl	%r14,.Lsysc_per
473
	stg	%r14,__LC_RETURN_PSW+8
474
	lghi	%r14,_PIF_SYSCALL | _PIF_PER_TRAP
475
	lpswe	__LC_RETURN_PSW		# branch to .Lsysc_per and enable irqs
M
Michael Grundy 已提交
476

L
Linus Torvalds 已提交
477 478 479
/*
 * IO interrupt handler routine
 */
480
ENTRY(io_int_handler)
481
	STCK	__LC_INT_CLOCK
482
	stpt	__LC_ASYNC_ENTER_TIMER
483 484 485 486 487
	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
	lg	%r10,__LC_LAST_BREAK
	lg	%r12,__LC_THREAD_INFO
	larl	%r13,system_call
	lmg	%r8,%r9,__LC_IO_OLD_PSW
488
	HANDLE_SIE_INTERCEPT %r14,2
489 490
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
	tmhh	%r8,0x0001		# interrupting from user?
491
	jz	.Lio_skip
492 493
	UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
	LAST_BREAK %r14
494
.Lio_skip:
495 496 497
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
498
	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
499
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
500
	TRACE_IRQS_OFF
501
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
502
.Lio_loop:
503
	lgr	%r2,%r11		# pass pointer to pt_regs
504 505
	lghi	%r3,IO_INTERRUPT
	tm	__PT_INT_CODE+8(%r11),0x80	# adapter interrupt ?
506
	jz	.Lio_call
507
	lghi	%r3,THIN_INTERRUPT
508
.Lio_call:
509
	brasl	%r14,do_IRQ
510
	tm	__LC_MACHINE_FLAGS+6,0x10	# MACHINE_FLAG_LPAR
511
	jz	.Lio_return
512
	tpi	0
513
	jz	.Lio_return
514
	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
515 516
	j	.Lio_loop
.Lio_return:
517 518
	LOCKDEP_SYS_EXIT
	TRACE_IRQS_ON
519
.Lio_tif:
520
	tm	__TI_flags+7(%r12),_TIF_WORK
521
	jnz	.Lio_work		# there is work to do (signals etc.)
522
	tm	__LC_CPU_FLAGS+7,_CIF_WORK
523 524
	jnz	.Lio_work
.Lio_restore:
525 526 527 528 529 530 531
	lg	%r14,__LC_VDSO_PER_CPU
	lmg	%r0,%r10,__PT_R0(%r11)
	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
	stpt	__LC_EXIT_TIMER
	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
	lmg	%r11,%r15,__PT_R11(%r11)
	lpswe	__LC_RETURN_PSW
532
.Lio_done:
L
Linus Torvalds 已提交
533

534
#
535
# There is work todo, find out in which context we have been interrupted:
536
# 1) if we return to user space we can do all _TIF_WORK work
537 538 539 540 541
# 2) if we return to kernel code and kvm is enabled check if we need to
#    modify the psw to leave SIE
# 3) if we return to kernel code and preemptive scheduling is enabled check
#    the preemption counter and if it is zero call preempt_schedule_irq
# Before any work can be done, a switch to the kernel stack is required.
542
#
543
.Lio_work:
544
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
545
	jo	.Lio_work_user		# yes -> do resched & signal
546
#ifdef CONFIG_PREEMPT
547
	# check for preemptive scheduling
548
	icm	%r0,15,__TI_precount(%r12)
549
	jnz	.Lio_restore		# preemption is disabled
550
	tm	__TI_flags+7(%r12),_TIF_NEED_RESCHED
551
	jno	.Lio_restore
L
Linus Torvalds 已提交
552
	# switch to kernel stack
553 554 555 556 557
	lg	%r1,__PT_R15(%r11)
	aghi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
L
Linus Torvalds 已提交
558
	lgr	%r15,%r1
559
	# TRACE_IRQS_ON already done at .Lio_return, call
560 561 562
	# TRACE_IRQS_OFF to keep things symmetrical
	TRACE_IRQS_OFF
	brasl	%r14,preempt_schedule_irq
563
	j	.Lio_return
564
#else
565
	j	.Lio_restore
566
#endif
L
Linus Torvalds 已提交
567

568 569 570
#
# Need to do work before returning to userspace, switch to kernel stack
#
571
.Lio_work_user:
L
Linus Torvalds 已提交
572
	lg	%r1,__LC_KERNEL_STACK
573 574 575
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
L
Linus Torvalds 已提交
576
	lgr	%r15,%r1
577

L
Linus Torvalds 已提交
578 579 580
#
# One of the work bits is on. Find out which one.
#
581
.Lio_work_tif:
582
	tm	__LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
583
	jo	.Lio_mcck_pending
584
	tm	__TI_flags+7(%r12),_TIF_NEED_RESCHED
585
	jo	.Lio_reschedule
586
	tm	__TI_flags+7(%r12),_TIF_SIGPENDING
587
	jo	.Lio_sigpending
588
	tm	__TI_flags+7(%r12),_TIF_NOTIFY_RESUME
589
	jo	.Lio_notify_resume
590
	tm	__LC_CPU_FLAGS+7,_CIF_ASCE
591 592
	jo	.Lio_uaccess
	j	.Lio_return		# beware of critical section cleanup
593

594
#
595
# _CIF_MCCK_PENDING is set, call handler
596
#
597 598
.Lio_mcck_pending:
	# TRACE_IRQS_ON already done at .Lio_return
H
Heiko Carstens 已提交
599
	brasl	%r14,s390_handle_mcck	# TIF bit will be cleared by handler
600
	TRACE_IRQS_OFF
601
	j	.Lio_return
602

603
#
604
# _CIF_ASCE is set, load user space asce
605
#
606
.Lio_uaccess:
607
	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE
608
	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
609
	j	.Lio_return
610

L
Linus Torvalds 已提交
611 612
#
# _TIF_NEED_RESCHED is set, call schedule
H
Heiko Carstens 已提交
613
#
614 615
.Lio_reschedule:
	# TRACE_IRQS_ON already done at .Lio_return
616
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
H
Heiko Carstens 已提交
617
	brasl	%r14,schedule		# call scheduler
618
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
619
	TRACE_IRQS_OFF
620
	j	.Lio_return
L
Linus Torvalds 已提交
621 622

#
623
# _TIF_SIGPENDING or is set, call do_signal
L
Linus Torvalds 已提交
624
#
625 626
.Lio_sigpending:
	# TRACE_IRQS_ON already done at .Lio_return
627 628 629 630
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,do_signal
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
631
	TRACE_IRQS_OFF
632
	j	.Lio_return
L
Linus Torvalds 已提交
633

M
Martin Schwidefsky 已提交
634 635 636
#
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
#
637 638
.Lio_notify_resume:
	# TRACE_IRQS_ON already done at .Lio_return
639 640 641 642
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,do_notify_resume
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
M
Martin Schwidefsky 已提交
643
	TRACE_IRQS_OFF
644
	j	.Lio_return
M
Martin Schwidefsky 已提交
645

L
Linus Torvalds 已提交
646 647 648
/*
 * External interrupt handler routine
 */
649
ENTRY(ext_int_handler)
650
	STCK	__LC_INT_CLOCK
651
	stpt	__LC_ASYNC_ENTER_TIMER
652 653 654 655 656
	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
	lg	%r10,__LC_LAST_BREAK
	lg	%r12,__LC_THREAD_INFO
	larl	%r13,system_call
	lmg	%r8,%r9,__LC_EXT_OLD_PSW
657
	HANDLE_SIE_INTERCEPT %r14,3
658 659
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
	tmhh	%r8,0x0001		# interrupting from user ?
660
	jz	.Lext_skip
661 662
	UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
	LAST_BREAK %r14
663
.Lext_skip:
664 665 666
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
667 668 669 670
	lghi	%r1,__LC_EXT_PARAMS2
	mvc	__PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
	mvc	__PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
	mvc	__PT_INT_PARM_LONG(8,%r11),0(%r1)
671
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
672
	TRACE_IRQS_OFF
673
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
674
	lgr	%r2,%r11		# pass pointer to pt_regs
675 676
	lghi	%r3,EXT_INTERRUPT
	brasl	%r14,do_IRQ
677
	j	.Lio_return
L
Linus Torvalds 已提交
678

M
Martin Schwidefsky 已提交
679
/*
680
 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
M
Martin Schwidefsky 已提交
681 682
 */
ENTRY(psw_idle)
683
	stg	%r3,__SF_EMPTY(%r15)
684
	larl	%r1,.Lpsw_idle_lpsw+4
M
Martin Schwidefsky 已提交
685
	stg	%r1,__SF_EMPTY+8(%r15)
686 687
	STCK	__CLOCK_IDLE_ENTER(%r2)
	stpt	__TIMER_IDLE_ENTER(%r2)
688
.Lpsw_idle_lpsw:
M
Martin Schwidefsky 已提交
689 690
	lpswe	__SF_EMPTY(%r15)
	br	%r14
691
.Lpsw_idle_end:
M
Martin Schwidefsky 已提交
692

693
.L__critical_end:
694

L
Linus Torvalds 已提交
695 696 697
/*
 * Machine check handler routines
 */
698
ENTRY(mcck_int_handler)
699
	STCK	__LC_MCCK_CLOCK
700 701
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
H
Heiko Carstens 已提交
702
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
703 704
	lg	%r10,__LC_LAST_BREAK
	lg	%r12,__LC_THREAD_INFO
705
	larl	%r13,system_call
706
	lmg	%r8,%r9,__LC_MCK_OLD_PSW
707
	HANDLE_SIE_INTERCEPT %r14,4
H
Heiko Carstens 已提交
708
	tm	__LC_MCCK_CODE,0x80	# system damage?
709
	jo	.Lmcck_panic		# yes -> rest of mcck code invalid
710 711
	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
712
	tm	__LC_MCCK_CODE+5,0x02	# stored cpu timer value valid?
713
	jo	3f
714 715 716 717 718
	la	%r14,__LC_SYNC_ENTER_TIMER
	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
	jl	0f
	la	%r14,__LC_ASYNC_ENTER_TIMER
0:	clc	0(8,%r14),__LC_EXIT_TIMER
719
	jl	1f
720
	la	%r14,__LC_EXIT_TIMER
721 722
1:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	jl	2f
723
	la	%r14,__LC_LAST_UPDATE_TIMER
724
2:	spt	0(%r14)
725
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
726
3:	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
727
	jno	.Lmcck_panic		# no -> skip cleanup critical
728 729
	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
	tm	%r8,0x0001		# interrupting from user ?
730
	jz	.Lmcck_skip
731 732
	UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
	LAST_BREAK %r14
733
.Lmcck_skip:
734 735 736
	lghi	%r14,__LC_GPREGS_SAVE_AREA+64
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),0(%r14)
737
	stmg	%r8,%r9,__PT_PSW(%r11)
738
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
739 740
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	lgr	%r2,%r11		# pass pointer to pt_regs
741
	brasl	%r14,s390_do_machine_check
742
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
743
	jno	.Lmcck_return
744
	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
745 746 747
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
748
	lgr	%r15,%r1
749
	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
750
	tm	__LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
751
	jno	.Lmcck_return
752
	TRACE_IRQS_OFF
753
	brasl	%r14,s390_handle_mcck
754
	TRACE_IRQS_ON
755
.Lmcck_return:
756 757 758
	lg	%r14,__LC_VDSO_PER_CPU
	lmg	%r0,%r10,__PT_R0(%r11)
	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
759 760 761
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
	jno	0f
	stpt	__LC_EXIT_TIMER
762 763 764 765
	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
0:	lmg	%r11,%r15,__PT_R11(%r11)
	lpswe	__LC_RETURN_MCCK_PSW

766
.Lmcck_panic:
767 768 769 770 771 772
	lg	%r14,__LC_PANIC_STACK
	slgr	%r14,%r15
	srag	%r14,%r14,PAGE_SHIFT
	jz	0f
	lg	%r15,__LC_PANIC_STACK
0:	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
773
	j	.Lmcck_skip
L
Linus Torvalds 已提交
774

775 776 777
#
# PSW restart interrupt handler
#
M
Martin Schwidefsky 已提交
778
ENTRY(restart_int_handler)
779
	stg	%r15,__LC_SAVE_AREA_RESTART
M
Martin Schwidefsky 已提交
780
	lg	%r15,__LC_RESTART_STACK
781
	aghi	%r15,-__PT_SIZE			# create pt_regs on stack
M
Martin Schwidefsky 已提交
782
	xc	0(__PT_SIZE,%r15),0(%r15)
783 784 785
	stmg	%r0,%r14,__PT_R0(%r15)
	mvc	__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
	mvc	__PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
M
Martin Schwidefsky 已提交
786 787
	aghi	%r15,-STACK_FRAME_OVERHEAD	# create stack frame on stack
	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
788 789 790
	lg	%r1,__LC_RESTART_FN		# load fn, parm & source cpu
	lg	%r2,__LC_RESTART_DATA
	lg	%r3,__LC_RESTART_SOURCE
M
Martin Schwidefsky 已提交
791 792
	ltgr	%r3,%r3				# test source cpu address
	jm	1f				# negative -> skip source stop
793
0:	sigp	%r4,%r3,SIGP_SENSE		# sigp sense to source cpu
M
Martin Schwidefsky 已提交
794 795 796 797
	brc	10,0b				# wait for status stored
1:	basr	%r14,%r1			# call function
	stap	__SF_EMPTY(%r15)		# store cpu address
	llgh	%r3,__SF_EMPTY(%r15)
798
2:	sigp	%r4,%r3,SIGP_STOP		# sigp stop to current cpu
M
Martin Schwidefsky 已提交
799 800
	brc	2,2b
3:	j	3b
801

802 803
	.section .kprobes.text, "ax"

L
Linus Torvalds 已提交
804 805 806 807 808 809 810
#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:
811 812
	lg	%r15,__LC_PANIC_STACK	# change to panic stack
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
813 814 815 816 817 818
	stmg	%r0,%r7,__PT_R0(%r11)
	stmg	%r8,%r9,__PT_PSW(%r11)
	mvc	__PT_R8(64,%r11),0(%r14)
	stg	%r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	lgr	%r2,%r11		# pass pointer to pt_regs
L
Linus Torvalds 已提交
819 820 821
	jg	kernel_stack_overflow
#endif

822
	.align	8
823
.Lcleanup_table:
824
	.quad	system_call
825 826 827 828 829 830 831
	.quad	.Lsysc_do_svc
	.quad	.Lsysc_tif
	.quad	.Lsysc_restore
	.quad	.Lsysc_done
	.quad	.Lio_tif
	.quad	.Lio_restore
	.quad	.Lio_done
M
Martin Schwidefsky 已提交
832
	.quad	psw_idle
833
	.quad	.Lpsw_idle_end
L
Linus Torvalds 已提交
834 835

cleanup_critical:
836
	clg	%r9,BASED(.Lcleanup_table)	# system_call
L
Linus Torvalds 已提交
837
	jl	0f
838 839 840
	clg	%r9,BASED(.Lcleanup_table+8)	# .Lsysc_do_svc
	jl	.Lcleanup_system_call
	clg	%r9,BASED(.Lcleanup_table+16)	# .Lsysc_tif
L
Linus Torvalds 已提交
841
	jl	0f
842 843 844 845 846
	clg	%r9,BASED(.Lcleanup_table+24)	# .Lsysc_restore
	jl	.Lcleanup_sysc_tif
	clg	%r9,BASED(.Lcleanup_table+32)	# .Lsysc_done
	jl	.Lcleanup_sysc_restore
	clg	%r9,BASED(.Lcleanup_table+40)	# .Lio_tif
847
	jl	0f
848 849 850 851 852
	clg	%r9,BASED(.Lcleanup_table+48)	# .Lio_restore
	jl	.Lcleanup_io_tif
	clg	%r9,BASED(.Lcleanup_table+56)	# .Lio_done
	jl	.Lcleanup_io_restore
	clg	%r9,BASED(.Lcleanup_table+64)	# psw_idle
M
Martin Schwidefsky 已提交
853
	jl	0f
854 855
	clg	%r9,BASED(.Lcleanup_table+72)	# .Lpsw_idle_end
	jl	.Lcleanup_idle
856 857
0:	br	%r14

L
Linus Torvalds 已提交
858

859
.Lcleanup_system_call:
860
	# check if stpt has been executed
861
	clg	%r9,BASED(.Lcleanup_system_call_insn)
L
Linus Torvalds 已提交
862 863
	jh	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
864
	cghi	%r11,__LC_SAVE_AREA_ASYNC
865
	je	0f
866 867
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
0:	# check if stmg has been executed
868
	clg	%r9,BASED(.Lcleanup_system_call_insn+8)
L
Linus Torvalds 已提交
869
	jh	0f
870 871
	mvc	__LC_SAVE_AREA_SYNC(64),0(%r11)
0:	# check if base register setup + TIF bit load has been done
872
	clg	%r9,BASED(.Lcleanup_system_call_insn+16)
873 874 875 876 877
	jhe	0f
	# set up saved registers r10 and r12
	stg	%r10,16(%r11)		# r10 last break
	stg	%r12,32(%r11)		# r12 thread-info pointer
0:	# check if the user time update has been done
878
	clg	%r9,BASED(.Lcleanup_system_call_insn+24)
879 880 881 882 883 884
	jh	0f
	lg	%r15,__LC_EXIT_TIMER
	slg	%r15,__LC_SYNC_ENTER_TIMER
	alg	%r15,__LC_USER_TIMER
	stg	%r15,__LC_USER_TIMER
0:	# check if the system time update has been done
885
	clg	%r9,BASED(.Lcleanup_system_call_insn+32)
886 887 888 889 890 891
	jh	0f
	lg	%r15,__LC_LAST_UPDATE_TIMER
	slg	%r15,__LC_EXIT_TIMER
	alg	%r15,__LC_SYSTEM_TIMER
	stg	%r15,__LC_SYSTEM_TIMER
0:	# update accounting time stamp
L
Linus Torvalds 已提交
892
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
893 894 895
	# do LAST_BREAK
	lg	%r9,16(%r11)
	srag	%r9,%r9,23
896
	jz	0f
897 898 899
	mvc	__TI_last_break(8,%r12),16(%r11)
0:	# set up saved register r11
	lg	%r15,__LC_KERNEL_STACK
900 901
	la	%r9,STACK_FRAME_OVERHEAD(%r15)
	stg	%r9,24(%r11)		# r11 pt_regs pointer
902
	# fill pt_regs
903 904 905 906
	mvc	__PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
	stmg	%r0,%r7,__PT_R0(%r9)
	mvc	__PT_PSW(16,%r9),__LC_SVC_OLD_PSW
	mvc	__PT_INT_CODE(4,%r9),__LC_SVC_ILC
907 908
	xc	__PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
	mvi	__PT_FLAGS+7(%r9),_PIF_SYSCALL
909 910 911
	# setup saved register r15
	stg	%r15,56(%r11)		# r15 stack pointer
	# set new psw address and exit
912
	larl	%r9,.Lsysc_do_svc
L
Linus Torvalds 已提交
913
	br	%r14
914
.Lcleanup_system_call_insn:
H
Heiko Carstens 已提交
915
	.quad	system_call
916 917 918 919
	.quad	.Lsysc_stmg
	.quad	.Lsysc_per
	.quad	.Lsysc_vtime+18
	.quad	.Lsysc_vtime+42
L
Linus Torvalds 已提交
920

921 922
.Lcleanup_sysc_tif:
	larl	%r9,.Lsysc_tif
L
Linus Torvalds 已提交
923 924
	br	%r14

925 926
.Lcleanup_sysc_restore:
	clg	%r9,BASED(.Lcleanup_sysc_restore_insn)
927
	je	0f
928 929 930 931 932
	lg	%r9,24(%r11)		# get saved pointer to pt_regs
	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
	mvc	0(64,%r11),__PT_R8(%r9)
	lmg	%r0,%r7,__PT_R0(%r9)
0:	lmg	%r8,%r9,__LC_RETURN_PSW
L
Linus Torvalds 已提交
933
	br	%r14
934 935
.Lcleanup_sysc_restore_insn:
	.quad	.Lsysc_done - 4
L
Linus Torvalds 已提交
936

937 938
.Lcleanup_io_tif:
	larl	%r9,.Lio_tif
939 940
	br	%r14

941 942
.Lcleanup_io_restore:
	clg	%r9,BASED(.Lcleanup_io_restore_insn)
943 944 945 946 947 948
	je	0f
	lg	%r9,24(%r11)		# get saved r11 pointer to pt_regs
	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
	mvc	0(64,%r11),__PT_R8(%r9)
	lmg	%r0,%r7,__PT_R0(%r9)
0:	lmg	%r8,%r9,__LC_RETURN_PSW
949
	br	%r14
950 951
.Lcleanup_io_restore_insn:
	.quad	.Lio_done - 4
952

953
.Lcleanup_idle:
M
Martin Schwidefsky 已提交
954
	# copy interrupt clock & cpu timer
955 956
	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
M
Martin Schwidefsky 已提交
957 958
	cghi	%r11,__LC_SAVE_AREA_ASYNC
	je	0f
959 960
	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
M
Martin Schwidefsky 已提交
961
0:	# check if stck & stpt have been executed
962
	clg	%r9,BASED(.Lcleanup_idle_insn)
M
Martin Schwidefsky 已提交
963
	jhe	1f
964 965 966
	mvc	__CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
	mvc	__TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
1:	# account system time going idle
M
Martin Schwidefsky 已提交
967
	lg	%r9,__LC_STEAL_TIMER
968
	alg	%r9,__CLOCK_IDLE_ENTER(%r2)
M
Martin Schwidefsky 已提交
969 970
	slg	%r9,__LC_LAST_UPDATE_CLOCK
	stg	%r9,__LC_STEAL_TIMER
971
	mvc	__LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
M
Martin Schwidefsky 已提交
972 973
	lg	%r9,__LC_SYSTEM_TIMER
	alg	%r9,__LC_LAST_UPDATE_TIMER
974
	slg	%r9,__TIMER_IDLE_ENTER(%r2)
M
Martin Schwidefsky 已提交
975
	stg	%r9,__LC_SYSTEM_TIMER
976
	mvc	__LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
M
Martin Schwidefsky 已提交
977
	# prepare return psw
978
	nihh	%r8,0xfcfd		# clear irq & wait state bits
M
Martin Schwidefsky 已提交
979 980
	lg	%r9,48(%r11)		# return from psw_idle
	br	%r14
981 982
.Lcleanup_idle_insn:
	.quad	.Lpsw_idle_lpsw
M
Martin Schwidefsky 已提交
983

L
Linus Torvalds 已提交
984 985 986
/*
 * Integer constants
 */
987
	.align	8
L
Linus Torvalds 已提交
988
.Lcritical_start:
989
	.quad	.L__critical_start
990
.Lcritical_length:
991
	.quad	.L__critical_end - .L__critical_start
992

L
Linus Torvalds 已提交
993

994
#if IS_ENABLED(CONFIG_KVM)
995 996 997 998 999
/*
 * sie64a calling convention:
 * %r2 pointer to sie control block
 * %r3 guest register save area
 */
1000
ENTRY(sie64a)
1001 1002 1003
	stmg	%r6,%r14,__SF_GPRS(%r15)	# save kernel registers
	stg	%r2,__SF_EMPTY(%r15)		# save control block pointer
	stg	%r3,__SF_EMPTY+8(%r15)		# save guest register save area
1004
	xc	__SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason
1005
	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
1006 1007
	lg	%r14,__LC_GMAP			# get gmap pointer
	ltgr	%r14,%r14
1008
	jz	.Lsie_gmap
1009
	lctlg	%c1,%c1,__GMAP_ASCE(%r14)	# load primary asce
1010
.Lsie_gmap:
1011
	lg	%r14,__SF_EMPTY(%r15)		# get control block pointer
1012
	oi	__SIE_PROG0C+3(%r14),1		# we are going into SIE now
1013
	tm	__SIE_PROG20+3(%r14),3		# last exit...
1014
	jnz	.Lsie_done
1015
	LPP	__SF_EMPTY(%r15)		# set guest id
1016
	sie	0(%r14)
1017
.Lsie_done:
1018
	LPP	__SF_EMPTY+16(%r15)		# set host id
1019
	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
1020
	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
1021 1022
# some program checks are suppressing. C code (e.g. do_protection_exception)
# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
1023
# instructions between sie64a and .Lsie_done should not cause program
1024 1025
# interrupts. So lets use a nop (47 00 00 00) as a landing pad.
# See also HANDLE_SIE_INTERCEPT
1026
.Lrewind_pad:
1027
	nop	0
1028
	.globl sie_exit
1029
sie_exit:
1030 1031 1032
	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
1033
	lg	%r2,__SF_EMPTY+24(%r15)		# return exit reason code
1034
	br	%r14
1035
.Lsie_fault:
1036 1037 1038
	lghi	%r14,-EFAULT
	stg	%r14,__SF_EMPTY+24(%r15)	# set exit reason code
	j	sie_exit
1039 1040

	.align	8
1041
.Lsie_critical:
1042
	.quad	.Lsie_gmap
1043
.Lsie_critical_length:
1044
	.quad	.Lsie_done - .Lsie_gmap
1045

1046 1047
	EX_TABLE(.Lrewind_pad,.Lsie_fault)
	EX_TABLE(sie_exit,.Lsie_fault)
1048 1049
#endif

H
Heiko Carstens 已提交
1050 1051
	.section .rodata, "a"
#define SYSCALL(esame,emu)	.long esame
1052
	.globl	sys_call_table
L
Linus Torvalds 已提交
1053 1054 1055 1056
sys_call_table:
#include "syscalls.S"
#undef SYSCALL

1057
#ifdef CONFIG_COMPAT
L
Linus Torvalds 已提交
1058

H
Heiko Carstens 已提交
1059
#define SYSCALL(esame,emu)	.long emu
1060
	.globl	sys_call_table_emu
L
Linus Torvalds 已提交
1061 1062 1063 1064
sys_call_table_emu:
#include "syscalls.S"
#undef SYSCALL
#endif