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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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#include <asm/vx-insn.h>
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#include <asm/setup.h>
#include <asm/nmi.h>
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#include <asm/export.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_SIZE_ORDER
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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 | \
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		   _TIF_UPROBE | _TIF_GUARDED_STORAGE)
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_TIF_TRACE	= (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
		   _TIF_SYSCALL_TRACEPOINT)
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_CIF_WORK	= (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \
		   _CIF_ASCE_SECONDARY | _CIF_FPU)
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_PIF_WORK	= (_PIF_PER_TRAP)
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#define BASED(name) name-cleanup_critical(%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	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,timer
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	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,__LC_ASYNC_STACK	# are we already on the async stack?
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	slgr	%r14,%r15
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	srag	%r14,%r14,STACK_SHIFT
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	jnz	2f
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	CHECK_STACK 1<<STACK_SHIFT,\savearea
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	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
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	j	3f
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1:	UPDATE_VTIME %r14,%r15,\timer
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2:	lg	%r15,__LC_ASYNC_STACK	# load async stack
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3:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
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	.endm
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	.macro UPDATE_VTIME w1,w2,enter_timer
	lg	\w1,__LC_EXIT_TIMER
	lg	\w2,__LC_LAST_UPDATE_TIMER
	slg	\w1,\enter_timer
	slg	\w2,__LC_EXIT_TIMER
	alg	\w1,__LC_USER_TIMER
	alg	\w2,__LC_SYSTEM_TIMER
	stg	\w1,__LC_USER_TIMER
	stg	\w2,__LC_SYSTEM_TIMER
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	mvc	__LC_LAST_UPDATE_TIMER(8),\enter_timer
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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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	/*
	 * The TSTMSK macro generates a test-under-mask instruction by
	 * calculating the memory offset for the specified mask value.
	 * Mask value can be any constant.  The macro shifts the mask
	 * value to calculate the memory offset for the test-under-mask
	 * instruction.
	 */
	.macro TSTMSK addr, mask, size=8, bytepos=0
		.if (\bytepos < \size) && (\mask >> 8)
			.if (\mask & 0xff)
				.error "Mask exceeds byte boundary"
			.endif
			TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)"
			.exitm
		.endif
		.ifeq \mask
			.error "Mask must not be zero"
		.endif
		off = \size - \bytepos - 1
		tm	off+\addr, \mask
	.endm

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	.section .kprobes.text, "ax"
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.Ldummy:
	/*
	 * This nop exists only in order to avoid that __switch_to starts at
	 * the beginning of the kprobes text section. In that case we would
	 * have several symbols at the same address. E.g. objdump would take
	 * an arbitrary symbol name when disassembling this code.
	 * With the added nop in between the __switch_to symbol is unique
	 * again.
	 */
	nop	0
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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
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	lg	%r5,__TASK_stack(%r3)		# start of kernel stack of next
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	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	%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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	mvc	__LC_CURRENT_PID(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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	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
	bzr	%r14
	.insn	s,0xb2800000,__LC_LPP		# set program parameter
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	br	%r14

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.L__critical_start:
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#if IS_ENABLED(CONFIG_KVM)
/*
 * sie64a calling convention:
 * %r2 pointer to sie control block
 * %r3 guest register save area
 */
ENTRY(sie64a)
	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
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	xc	__SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0
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	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU		# load guest fp/vx registers ?
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	jno	.Lsie_load_guest_gprs
	brasl	%r14,load_fpu_regs		# load guest fp/vx regs
.Lsie_load_guest_gprs:
	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
	lg	%r14,__LC_GMAP			# get gmap pointer
	ltgr	%r14,%r14
	jz	.Lsie_gmap
	lctlg	%c1,%c1,__GMAP_ASCE(%r14)	# load primary asce
.Lsie_gmap:
	lg	%r14,__SF_EMPTY(%r15)		# get control block pointer
	oi	__SIE_PROG0C+3(%r14),1		# we are going into SIE now
	tm	__SIE_PROG20+3(%r14),3		# last exit...
	jnz	.Lsie_skip
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	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
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	jo	.Lsie_skip			# exit if fp/vx regs changed
	sie	0(%r14)
.Lsie_skip:
	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
.Lsie_done:
# 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
# instructions between sie64a and .Lsie_done should not cause program
# interrupts. So lets use a nop (47 00 00 00) as a landing pad.
# See also .Lcleanup_sie
.Lrewind_pad:
	nop	0
	.globl sie_exit
sie_exit:
	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
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	lg	%r2,__SF_EMPTY+16(%r15)		# return exit reason code
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	br	%r14
.Lsie_fault:
	lghi	%r14,-EFAULT
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	stg	%r14,__SF_EMPTY+16(%r15)	# set exit reason code
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	j	sie_exit

	EX_TABLE(.Lrewind_pad,.Lsie_fault)
	EX_TABLE(sie_exit,.Lsie_fault)
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EXPORT_SYMBOL(sie64a)
EXPORT_SYMBOL(sie_exit)
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#endif

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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
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	lg	%r12,__LC_CURRENT
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	lghi	%r13,__TASK_thread
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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 %r8,%r9,__LC_SYNC_ENTER_TIMER
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	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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	# load address of system call table
	lg	%r10,__THREAD_sysc_table(%r13,%r12)
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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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	TSTMSK	__TI_flags(%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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	TSTMSK	__PT_FLAGS(%r11),_PIF_WORK
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	jnz	.Lsysc_work
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	TSTMSK	__TI_flags(%r12),_TIF_WORK
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	jnz	.Lsysc_work			# check for work
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	TSTMSK	__LC_CPU_FLAGS,_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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	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
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	jo	.Lsysc_mcck_pending
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	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
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	jo	.Lsysc_reschedule
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#ifdef CONFIG_UPROBES
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	TSTMSK	__TI_flags(%r12),_TIF_UPROBE
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	jo	.Lsysc_uprobe_notify
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#endif
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	TSTMSK	__TI_flags(%r12),_TIF_GUARDED_STORAGE
	jo	.Lsysc_guarded_storage
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	TSTMSK	__PT_FLAGS(%r11),_PIF_PER_TRAP
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	jo	.Lsysc_singlestep
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	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
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	jo	.Lsysc_sigpending
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	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
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	jo	.Lsysc_notify_resume
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	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
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	jo	.Lsysc_vxrs
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	TSTMSK	__LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
	jnz	.Lsysc_asce
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	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_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
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#
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.Lsysc_asce:
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	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
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	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
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	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_SECONDARY
	jz	.Lsysc_return
	larl	%r14,.Lsysc_return
	jg	set_fs_fixup
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#
# CIF_FPU is set, restore floating-point controls and floating-point registers.
#
.Lsysc_vxrs:
	larl	%r14,.Lsysc_return
	jg	load_fpu_regs

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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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	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
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	jno	.Lsysc_return
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.Lsysc_do_syscall:
	lghi	%r13,__TASK_thread
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	lmg	%r2,%r7,__PT_R2(%r11)	# load svc arguments
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	lghi	%r1,0			# svc 0 returns -ENOSYS
	j	.Lsysc_do_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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#
# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
#
.Lsysc_guarded_storage:
	lgr	%r2,%r11		# pass pointer to pt_regs
	larl	%r14,.Lsysc_return
	jg	gs_load_bc_cb

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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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	TSTMSK	__TI_flags(%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)
460
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
461
	lg	%r12,__LC_CURRENT
462 463 464
	brasl	%r14,schedule_tail
	TRACE_IRQS_ON
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
465
	tm	__PT_PSW+1(%r11),0x01	# forking a kernel thread ?
466
	jne	.Lsysc_tracenogo
467 468
	# it's a kernel thread
	lmg	%r9,%r10,__PT_R9(%r11)	# load gprs
469 470 471
ENTRY(kernel_thread_starter)
	la	%r2,0(%r10)
	basr	%r14,%r9
472
	j	.Lsysc_tracenogo
L
Linus Torvalds 已提交
473 474 475 476 477

/*
 * Program check handler routine
 */

478
ENTRY(pgm_check_handler)
M
Martin Schwidefsky 已提交
479
	stpt	__LC_SYNC_ENTER_TIMER
480 481
	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
	lg	%r10,__LC_LAST_BREAK
482
	lg	%r12,__LC_CURRENT
483
	larl	%r13,cleanup_critical
484 485
	lmg	%r8,%r9,__LC_PGM_OLD_PSW
	tmhh	%r8,0x0001		# test problem state bit
486 487 488 489 490 491 492 493 494 495 496
	jnz	2f			# -> fault in user space
#if IS_ENABLED(CONFIG_KVM)
	# cleanup critical section for sie64a
	lgr	%r14,%r9
	slg	%r14,BASED(.Lsie_critical_start)
	clg	%r14,BASED(.Lsie_critical_length)
	jhe	0f
	brasl	%r14,.Lcleanup_sie
#endif
0:	tmhh	%r8,0x4000		# PER bit set in old PSW ?
	jnz	1f			# -> enabled, can't be a double fault
497
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
498
	jnz	.Lpgm_svcper		# -> single stepped svc
499
1:	CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
500
	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
501
	j	4f
502
2:	UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
503
	lg	%r15,__LC_KERNEL_STACK
504
	lgr	%r14,%r12
505
	aghi	%r14,__TASK_thread	# pointer to thread_struct
506 507
	lghi	%r13,__LC_PGM_TDB
	tm	__LC_PGM_ILC+2,0x02	# check for transaction abort
508
	jz	3f
509
	mvc	__THREAD_trap_tdb(256,%r14),0(%r13)
510 511
3:	stg	%r10,__THREAD_last_break(%r14)
4:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
512 513 514
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
M
Martin Schwidefsky 已提交
515 516
	mvc	__PT_INT_CODE(4,%r11),__LC_PGM_ILC
	mvc	__PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
517
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
518 519
	stg	%r10,__PT_ARGS(%r11)
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
520
	jz	5f
521
	tmhh	%r8,0x0001		# kernel per event ?
522
	jz	.Lpgm_kprobe
523
	oi	__PT_FLAGS+7(%r11),_PIF_PER_TRAP
524
	mvc	__THREAD_per_address(8,%r14),__LC_PER_ADDRESS
525 526
	mvc	__THREAD_per_cause(2,%r14),__LC_PER_CODE
	mvc	__THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
527
5:	REENABLE_IRQS
528
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
529
	larl	%r1,pgm_check_table
M
Martin Schwidefsky 已提交
530 531
	llgh	%r10,__PT_INT_CODE+2(%r11)
	nill	%r10,0x007f
532
	sll	%r10,2
533
	je	.Lpgm_return
534
	lgf	%r1,0(%r10,%r1)		# load address of handler routine
535
	lgr	%r2,%r11		# pass pointer to pt_regs
536
	basr	%r14,%r1		# branch to interrupt-handler
537 538 539 540
.Lpgm_return:
	LOCKDEP_SYS_EXIT
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
	jno	.Lsysc_restore
541 542
	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
	jo	.Lsysc_do_syscall
543
	j	.Lsysc_tif
L
Linus Torvalds 已提交
544 545

#
546
# PER event in supervisor state, must be kprobes
L
Linus Torvalds 已提交
547
#
548
.Lpgm_kprobe:
549 550 551 552
	REENABLE_IRQS
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,do_per_trap
553
	j	.Lpgm_return
L
Linus Torvalds 已提交
554

M
Michael Grundy 已提交
555
#
556
# single stepped system call
M
Michael Grundy 已提交
557
#
558
.Lpgm_svcper:
559
	mvc	__LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
560
	lghi	%r13,__TASK_thread
561
	larl	%r14,.Lsysc_per
562
	stg	%r14,__LC_RETURN_PSW+8
563
	lghi	%r14,_PIF_SYSCALL | _PIF_PER_TRAP
564
	lpswe	__LC_RETURN_PSW		# branch to .Lsysc_per and enable irqs
M
Michael Grundy 已提交
565

L
Linus Torvalds 已提交
566 567 568
/*
 * IO interrupt handler routine
 */
569
ENTRY(io_int_handler)
570
	STCK	__LC_INT_CLOCK
571
	stpt	__LC_ASYNC_ENTER_TIMER
572
	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
573
	lg	%r12,__LC_CURRENT
574
	larl	%r13,cleanup_critical
575
	lmg	%r8,%r9,__LC_IO_OLD_PSW
576
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
577 578 579
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
580
	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
581
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
582 583
	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
	jo	.Lio_restore
584
	TRACE_IRQS_OFF
585
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
586
.Lio_loop:
587
	lgr	%r2,%r11		# pass pointer to pt_regs
588 589
	lghi	%r3,IO_INTERRUPT
	tm	__PT_INT_CODE+8(%r11),0x80	# adapter interrupt ?
590
	jz	.Lio_call
591
	lghi	%r3,THIN_INTERRUPT
592
.Lio_call:
593
	brasl	%r14,do_IRQ
594
	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR
595
	jz	.Lio_return
596
	tpi	0
597
	jz	.Lio_return
598
	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
599 600
	j	.Lio_loop
.Lio_return:
601 602
	LOCKDEP_SYS_EXIT
	TRACE_IRQS_ON
603
.Lio_tif:
604
	TSTMSK	__TI_flags(%r12),_TIF_WORK
605
	jnz	.Lio_work		# there is work to do (signals etc.)
606
	TSTMSK	__LC_CPU_FLAGS,_CIF_WORK
607 608
	jnz	.Lio_work
.Lio_restore:
609 610 611 612 613 614 615
	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
616
.Lio_done:
L
Linus Torvalds 已提交
617

618
#
619
# There is work todo, find out in which context we have been interrupted:
620
# 1) if we return to user space we can do all _TIF_WORK work
621 622 623 624 625
# 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.
626
#
627
.Lio_work:
628
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
629
	jo	.Lio_work_user		# yes -> do resched & signal
630
#ifdef CONFIG_PREEMPT
631
	# check for preemptive scheduling
632
	icm	%r0,15,__LC_PREEMPT_COUNT
633
	jnz	.Lio_restore		# preemption is disabled
634
	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
635
	jno	.Lio_restore
L
Linus Torvalds 已提交
636
	# switch to kernel stack
637 638 639 640 641
	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
642
	lgr	%r15,%r1
643
	# TRACE_IRQS_ON already done at .Lio_return, call
644 645 646
	# TRACE_IRQS_OFF to keep things symmetrical
	TRACE_IRQS_OFF
	brasl	%r14,preempt_schedule_irq
647
	j	.Lio_return
648
#else
649
	j	.Lio_restore
650
#endif
L
Linus Torvalds 已提交
651

652 653 654
#
# Need to do work before returning to userspace, switch to kernel stack
#
655
.Lio_work_user:
L
Linus Torvalds 已提交
656
	lg	%r1,__LC_KERNEL_STACK
657 658 659
	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
660
	lgr	%r15,%r1
661

L
Linus Torvalds 已提交
662 663 664
#
# One of the work bits is on. Find out which one.
#
665
.Lio_work_tif:
666
	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
667
	jo	.Lio_mcck_pending
668
	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
669
	jo	.Lio_reschedule
670
	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
671
	jo	.Lio_sigpending
672
	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
673
	jo	.Lio_notify_resume
674 675
	TSTMSK	__TI_flags(%r12),_TIF_GUARDED_STORAGE
	jo	.Lio_guarded_storage
676
	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
677
	jo	.Lio_vxrs
678 679
	TSTMSK	__LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
	jnz	.Lio_asce
680
	j	.Lio_return		# beware of critical section cleanup
681

682
#
683
# _CIF_MCCK_PENDING is set, call handler
684
#
685 686
.Lio_mcck_pending:
	# TRACE_IRQS_ON already done at .Lio_return
H
Heiko Carstens 已提交
687
	brasl	%r14,s390_handle_mcck	# TIF bit will be cleared by handler
688
	TRACE_IRQS_OFF
689
	j	.Lio_return
690

691
#
692
# _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
693
#
694
.Lio_asce:
695
	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
696
	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
697 698 699 700
	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_SECONDARY
	jz	.Lio_return
	larl	%r14,.Lio_return
	jg	set_fs_fixup
701

702 703 704 705 706 707 708
#
# CIF_FPU is set, restore floating-point controls and floating-point registers.
#
.Lio_vxrs:
	larl	%r14,.Lio_return
	jg	load_fpu_regs

709 710 711 712 713 714 715 716 717 718 719 720
#
# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
#
.Lio_guarded_storage:
	# TRACE_IRQS_ON already done at .Lio_return
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lgr	%r2,%r11		# pass pointer to pt_regs
	brasl	%r14,gs_load_bc_cb
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
	TRACE_IRQS_OFF
	j	.Lio_return

L
Linus Torvalds 已提交
721 722
#
# _TIF_NEED_RESCHED is set, call schedule
H
Heiko Carstens 已提交
723
#
724 725
.Lio_reschedule:
	# TRACE_IRQS_ON already done at .Lio_return
726
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
H
Heiko Carstens 已提交
727
	brasl	%r14,schedule		# call scheduler
728
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
729
	TRACE_IRQS_OFF
730
	j	.Lio_return
L
Linus Torvalds 已提交
731 732

#
733
# _TIF_SIGPENDING or is set, call do_signal
L
Linus Torvalds 已提交
734
#
735 736
.Lio_sigpending:
	# TRACE_IRQS_ON already done at .Lio_return
737 738 739 740
	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
741
	TRACE_IRQS_OFF
742
	j	.Lio_return
L
Linus Torvalds 已提交
743

M
Martin Schwidefsky 已提交
744 745 746
#
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
#
747 748
.Lio_notify_resume:
	# TRACE_IRQS_ON already done at .Lio_return
749 750 751 752
	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
753
	TRACE_IRQS_OFF
754
	j	.Lio_return
M
Martin Schwidefsky 已提交
755

L
Linus Torvalds 已提交
756 757 758
/*
 * External interrupt handler routine
 */
759
ENTRY(ext_int_handler)
760
	STCK	__LC_INT_CLOCK
761
	stpt	__LC_ASYNC_ENTER_TIMER
762
	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
763
	lg	%r12,__LC_CURRENT
764
	larl	%r13,cleanup_critical
765
	lmg	%r8,%r9,__LC_EXT_OLD_PSW
766
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
767 768 769
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
	stmg	%r8,%r9,__PT_PSW(%r11)
770 771 772 773
	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)
774
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
775 776
	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
	jo	.Lio_restore
777
	TRACE_IRQS_OFF
778
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
779
	lgr	%r2,%r11		# pass pointer to pt_regs
780 781
	lghi	%r3,EXT_INTERRUPT
	brasl	%r14,do_IRQ
782
	j	.Lio_return
L
Linus Torvalds 已提交
783

M
Martin Schwidefsky 已提交
784
/*
785
 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
M
Martin Schwidefsky 已提交
786 787
 */
ENTRY(psw_idle)
788
	stg	%r3,__SF_EMPTY(%r15)
789
	larl	%r1,.Lpsw_idle_lpsw+4
M
Martin Schwidefsky 已提交
790
	stg	%r1,__SF_EMPTY+8(%r15)
791 792 793 794 795 796 797 798
#ifdef CONFIG_SMP
	larl	%r1,smp_cpu_mtid
	llgf	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	.Lpsw_idle_stcctm
	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15)
.Lpsw_idle_stcctm:
#endif
799
	oi	__LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
800 801
	STCK	__CLOCK_IDLE_ENTER(%r2)
	stpt	__TIMER_IDLE_ENTER(%r2)
802
.Lpsw_idle_lpsw:
M
Martin Schwidefsky 已提交
803 804
	lpswe	__SF_EMPTY(%r15)
	br	%r14
805
.Lpsw_idle_end:
M
Martin Schwidefsky 已提交
806

807 808 809 810 811 812
/*
 * Store floating-point controls and floating-point or vector register
 * depending whether the vector facility is available.	A critical section
 * cleanup assures that the registers are stored even if interrupted for
 * some other work.  The CIF_FPU flag is set to trigger a lazy restore
 * of the register contents at return from io or a system call.
813 814
 */
ENTRY(save_fpu_regs)
815 816
	lg	%r2,__LC_CURRENT
	aghi	%r2,__TASK_thread
817
	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
818
	bor	%r14
819 820
	stfpc	__THREAD_FPU_fpc(%r2)
	lg	%r3,__THREAD_FPU_regs(%r2)
821
	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	jz	.Lsave_fpu_regs_fp	  # no -> store FP regs
	VSTM	%v0,%v15,0,%r3		  # vstm 0,15,0(3)
	VSTM	%v16,%v31,256,%r3	  # vstm 16,31,256(3)
	j	.Lsave_fpu_regs_done	  # -> set CIF_FPU flag
.Lsave_fpu_regs_fp:
	std	0,0(%r3)
	std	1,8(%r3)
	std	2,16(%r3)
	std	3,24(%r3)
	std	4,32(%r3)
	std	5,40(%r3)
	std	6,48(%r3)
	std	7,56(%r3)
	std	8,64(%r3)
	std	9,72(%r3)
	std	10,80(%r3)
	std	11,88(%r3)
	std	12,96(%r3)
	std	13,104(%r3)
	std	14,112(%r3)
	std	15,120(%r3)
.Lsave_fpu_regs_done:
	oi	__LC_CPU_FLAGS+7,_CIF_FPU
	br	%r14
.Lsave_fpu_regs_end:
A
Al Viro 已提交
847 848 849
#if IS_ENABLED(CONFIG_KVM)
EXPORT_SYMBOL(save_fpu_regs)
#endif
850

851 852 853 854
/*
 * Load floating-point controls and floating-point or vector registers.
 * A critical section cleanup assures that the register contents are
 * loaded even if interrupted for some other work.
855 856 857 858
 *
 * There are special calling conventions to fit into sysc and io return work:
 *	%r15:	<kernel stack>
 * The function requires:
859
 *	%r4
860 861
 */
load_fpu_regs:
862 863
	lg	%r4,__LC_CURRENT
	aghi	%r4,__TASK_thread
864
	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
865
	bnor	%r14
866
	lfpc	__THREAD_FPU_fpc(%r4)
867
	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
868
	lg	%r4,__THREAD_FPU_regs(%r4)	# %r4 <- reg save area
869
	jz	.Lload_fpu_regs_fp		# -> no VX, load FP regs
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
	VLM	%v0,%v15,0,%r4
	VLM	%v16,%v31,256,%r4
	j	.Lload_fpu_regs_done
.Lload_fpu_regs_fp:
	ld	0,0(%r4)
	ld	1,8(%r4)
	ld	2,16(%r4)
	ld	3,24(%r4)
	ld	4,32(%r4)
	ld	5,40(%r4)
	ld	6,48(%r4)
	ld	7,56(%r4)
	ld	8,64(%r4)
	ld	9,72(%r4)
	ld	10,80(%r4)
	ld	11,88(%r4)
	ld	12,96(%r4)
	ld	13,104(%r4)
	ld	14,112(%r4)
	ld	15,120(%r4)
.Lload_fpu_regs_done:
	ni	__LC_CPU_FLAGS+7,255-_CIF_FPU
	br	%r14
.Lload_fpu_regs_end:

895
.L__critical_end:
896

L
Linus Torvalds 已提交
897 898 899
/*
 * Machine check handler routines
 */
900
ENTRY(mcck_int_handler)
901
	STCK	__LC_MCCK_CLOCK
902 903
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
H
Heiko Carstens 已提交
904
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
905
	lg	%r12,__LC_CURRENT
906
	larl	%r13,cleanup_critical
907
	lmg	%r8,%r9,__LC_MCK_OLD_PSW
908
	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE
909
	jo	.Lmcck_panic		# yes -> rest of mcck code invalid
910 911
	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
912
	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID
913
	jo	3f
914 915 916 917 918
	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
919
	jl	1f
920
	la	%r14,__LC_EXIT_TIMER
921 922
1:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	jl	2f
923
	la	%r14,__LC_LAST_UPDATE_TIMER
924
2:	spt	0(%r14)
925
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
926
3:	TSTMSK	__LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID)
927
	jno	.Lmcck_panic		# no -> skip cleanup critical
928
	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
929
.Lmcck_skip:
930 931 932
	lghi	%r14,__LC_GPREGS_SAVE_AREA+64
	stmg	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(64,%r11),0(%r14)
933
	stmg	%r8,%r9,__PT_PSW(%r11)
934
	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
935 936
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	lgr	%r2,%r11		# pass pointer to pt_regs
937
	brasl	%r14,s390_do_machine_check
938
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
939
	jno	.Lmcck_return
940
	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
941 942 943
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
944
	lgr	%r15,%r1
945
	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
946
	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
947
	jno	.Lmcck_return
948
	TRACE_IRQS_OFF
949
	brasl	%r14,s390_handle_mcck
950
	TRACE_IRQS_ON
951
.Lmcck_return:
952 953 954
	lg	%r14,__LC_VDSO_PER_CPU
	lmg	%r0,%r10,__PT_R0(%r11)
	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
955 956 957
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
	jno	0f
	stpt	__LC_EXIT_TIMER
958 959 960 961
	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
0:	lmg	%r11,%r15,__PT_R11(%r11)
	lpswe	__LC_RETURN_MCCK_PSW

962
.Lmcck_panic:
963
	lg	%r15,__LC_PANIC_STACK
964
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
965
	j	.Lmcck_skip
L
Linus Torvalds 已提交
966

967 968 969
#
# PSW restart interrupt handler
#
M
Martin Schwidefsky 已提交
970
ENTRY(restart_int_handler)
971 972 973 974
	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
	jz	0f
	.insn	s,0xb2800000,__LC_LPP
0:	stg	%r15,__LC_SAVE_AREA_RESTART
M
Martin Schwidefsky 已提交
975
	lg	%r15,__LC_RESTART_STACK
976
	aghi	%r15,-__PT_SIZE			# create pt_regs on stack
M
Martin Schwidefsky 已提交
977
	xc	0(__PT_SIZE,%r15),0(%r15)
978 979 980
	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
981 982
	aghi	%r15,-STACK_FRAME_OVERHEAD	# create stack frame on stack
	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
983 984 985
	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
986 987
	ltgr	%r3,%r3				# test source cpu address
	jm	1f				# negative -> skip source stop
988
0:	sigp	%r4,%r3,SIGP_SENSE		# sigp sense to source cpu
M
Martin Schwidefsky 已提交
989 990 991 992
	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)
993
2:	sigp	%r4,%r3,SIGP_STOP		# sigp stop to current cpu
M
Martin Schwidefsky 已提交
994 995
	brc	2,2b
3:	j	3b
996

997 998
	.section .kprobes.text, "ax"

L
Linus Torvalds 已提交
999 1000 1001 1002 1003 1004 1005
#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:
1006 1007
	lg	%r15,__LC_PANIC_STACK	# change to panic stack
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
1008 1009 1010 1011 1012 1013
	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
1014 1015 1016 1017
	jg	kernel_stack_overflow
#endif

cleanup_critical:
1018 1019 1020 1021 1022 1023
#if IS_ENABLED(CONFIG_KVM)
	clg	%r9,BASED(.Lcleanup_table_sie)	# .Lsie_gmap
	jl	0f
	clg	%r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done
	jl	.Lcleanup_sie
#endif
1024
	clg	%r9,BASED(.Lcleanup_table)	# system_call
L
Linus Torvalds 已提交
1025
	jl	0f
1026 1027 1028
	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
1029
	jl	0f
1030 1031 1032 1033 1034
	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
1035
	jl	0f
1036 1037 1038 1039 1040
	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
1041
	jl	0f
1042 1043
	clg	%r9,BASED(.Lcleanup_table+72)	# .Lpsw_idle_end
	jl	.Lcleanup_idle
1044 1045 1046 1047 1048 1049 1050 1051
	clg	%r9,BASED(.Lcleanup_table+80)	# save_fpu_regs
	jl	0f
	clg	%r9,BASED(.Lcleanup_table+88)	# .Lsave_fpu_regs_end
	jl	.Lcleanup_save_fpu_regs
	clg	%r9,BASED(.Lcleanup_table+96)	# load_fpu_regs
	jl	0f
	clg	%r9,BASED(.Lcleanup_table+104)	# .Lload_fpu_regs_end
	jl	.Lcleanup_load_fpu_regs
1052 1053
0:	br	%r14

1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	.align	8
.Lcleanup_table:
	.quad	system_call
	.quad	.Lsysc_do_svc
	.quad	.Lsysc_tif
	.quad	.Lsysc_restore
	.quad	.Lsysc_done
	.quad	.Lio_tif
	.quad	.Lio_restore
	.quad	.Lio_done
	.quad	psw_idle
	.quad	.Lpsw_idle_end
	.quad	save_fpu_regs
	.quad	.Lsave_fpu_regs_end
	.quad	load_fpu_regs
	.quad	.Lload_fpu_regs_end

#if IS_ENABLED(CONFIG_KVM)
.Lcleanup_table_sie:
	.quad	.Lsie_gmap
	.quad	.Lsie_done

.Lcleanup_sie:
	lg	%r9,__SF_EMPTY(%r15)		# get control block pointer
1078
	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
1079 1080 1081 1082
	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
	larl	%r9,sie_exit			# skip forward to sie_exit
	br	%r14
#endif
L
Linus Torvalds 已提交
1083

1084
.Lcleanup_system_call:
1085
	# check if stpt has been executed
1086
	clg	%r9,BASED(.Lcleanup_system_call_insn)
L
Linus Torvalds 已提交
1087 1088
	jh	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
1089
	cghi	%r11,__LC_SAVE_AREA_ASYNC
1090
	je	0f
1091 1092
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
0:	# check if stmg has been executed
1093
	clg	%r9,BASED(.Lcleanup_system_call_insn+8)
L
Linus Torvalds 已提交
1094
	jh	0f
1095 1096
	mvc	__LC_SAVE_AREA_SYNC(64),0(%r11)
0:	# check if base register setup + TIF bit load has been done
1097
	clg	%r9,BASED(.Lcleanup_system_call_insn+16)
1098
	jhe	0f
1099 1100 1101 1102
	# set up saved register r12 task struct pointer
	stg	%r12,32(%r11)
	# set up saved register r13 __TASK_thread offset
	mvc	40(8,%r11),BASED(.Lcleanup_system_call_const)
1103
0:	# check if the user time update has been done
1104
	clg	%r9,BASED(.Lcleanup_system_call_insn+24)
1105 1106 1107 1108 1109 1110
	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
1111
	clg	%r9,BASED(.Lcleanup_system_call_insn+32)
1112 1113 1114 1115 1116 1117
	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
1118
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
1119
	# set up saved register r11
1120
	lg	%r15,__LC_KERNEL_STACK
1121 1122
	la	%r9,STACK_FRAME_OVERHEAD(%r15)
	stg	%r9,24(%r11)		# r11 pt_regs pointer
1123
	# fill pt_regs
1124 1125 1126 1127
	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
1128 1129
	xc	__PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
	mvi	__PT_FLAGS+7(%r9),_PIF_SYSCALL
1130 1131 1132
	# setup saved register r15
	stg	%r15,56(%r11)		# r15 stack pointer
	# set new psw address and exit
1133
	larl	%r9,.Lsysc_do_svc
L
Linus Torvalds 已提交
1134
	br	%r14
1135
.Lcleanup_system_call_insn:
H
Heiko Carstens 已提交
1136
	.quad	system_call
1137 1138
	.quad	.Lsysc_stmg
	.quad	.Lsysc_per
1139
	.quad	.Lsysc_vtime+36
1140
	.quad	.Lsysc_vtime+42
1141 1142
.Lcleanup_system_call_const:
	.quad	__TASK_thread
L
Linus Torvalds 已提交
1143

1144 1145
.Lcleanup_sysc_tif:
	larl	%r9,.Lsysc_tif
L
Linus Torvalds 已提交
1146 1147
	br	%r14

1148 1149
.Lcleanup_sysc_restore:
	clg	%r9,BASED(.Lcleanup_sysc_restore_insn)
1150
	je	0f
1151 1152 1153 1154 1155
	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
1156
	br	%r14
1157 1158
.Lcleanup_sysc_restore_insn:
	.quad	.Lsysc_done - 4
L
Linus Torvalds 已提交
1159

1160 1161
.Lcleanup_io_tif:
	larl	%r9,.Lio_tif
1162 1163
	br	%r14

1164 1165
.Lcleanup_io_restore:
	clg	%r9,BASED(.Lcleanup_io_restore_insn)
1166 1167 1168 1169 1170 1171
	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
1172
	br	%r14
1173 1174
.Lcleanup_io_restore_insn:
	.quad	.Lio_done - 4
1175

1176
.Lcleanup_idle:
1177
	ni	__LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT
M
Martin Schwidefsky 已提交
1178
	# copy interrupt clock & cpu timer
1179 1180
	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
1181 1182
	cghi	%r11,__LC_SAVE_AREA_ASYNC
	je	0f
1183 1184
	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
1185
0:	# check if stck & stpt have been executed
1186
	clg	%r9,BASED(.Lcleanup_idle_insn)
M
Martin Schwidefsky 已提交
1187
	jhe	1f
1188 1189
	mvc	__CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
	mvc	__TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
1:	# calculate idle cycles
#ifdef CONFIG_SMP
	clg	%r9,BASED(.Lcleanup_idle_insn)
	jl	3f
	larl	%r1,smp_cpu_mtid
	llgf	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	3f
	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15)
	larl	%r3,mt_cycles
	ag	%r3,__LC_PERCPU_OFFSET
	la	%r4,__SF_EMPTY+16(%r15)
2:	lg	%r0,0(%r3)
	slg	%r0,0(%r4)
	alg	%r0,64(%r4)
	stg	%r0,0(%r3)
	la	%r3,8(%r3)
	la	%r4,8(%r4)
	brct	%r1,2b
#endif
3:	# account system time going idle
M
Martin Schwidefsky 已提交
1211
	lg	%r9,__LC_STEAL_TIMER
1212
	alg	%r9,__CLOCK_IDLE_ENTER(%r2)
M
Martin Schwidefsky 已提交
1213 1214
	slg	%r9,__LC_LAST_UPDATE_CLOCK
	stg	%r9,__LC_STEAL_TIMER
1215
	mvc	__LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
M
Martin Schwidefsky 已提交
1216 1217
	lg	%r9,__LC_SYSTEM_TIMER
	alg	%r9,__LC_LAST_UPDATE_TIMER
1218
	slg	%r9,__TIMER_IDLE_ENTER(%r2)
M
Martin Schwidefsky 已提交
1219
	stg	%r9,__LC_SYSTEM_TIMER
1220
	mvc	__LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
M
Martin Schwidefsky 已提交
1221
	# prepare return psw
1222
	nihh	%r8,0xfcfd		# clear irq & wait state bits
M
Martin Schwidefsky 已提交
1223 1224
	lg	%r9,48(%r11)		# return from psw_idle
	br	%r14
1225 1226
.Lcleanup_idle_insn:
	.quad	.Lpsw_idle_lpsw
M
Martin Schwidefsky 已提交
1227

1228
.Lcleanup_save_fpu_regs:
1229
	larl	%r9,save_fpu_regs
1230 1231 1232
	br	%r14

.Lcleanup_load_fpu_regs:
1233
	larl	%r9,load_fpu_regs
1234 1235
	br	%r14

L
Linus Torvalds 已提交
1236 1237 1238
/*
 * Integer constants
 */
1239
	.align	8
L
Linus Torvalds 已提交
1240
.Lcritical_start:
1241
	.quad	.L__critical_start
1242
.Lcritical_length:
1243
	.quad	.L__critical_end - .L__critical_start
1244
#if IS_ENABLED(CONFIG_KVM)
1245
.Lsie_critical_start:
1246
	.quad	.Lsie_gmap
1247
.Lsie_critical_length:
1248
	.quad	.Lsie_done - .Lsie_gmap
1249 1250
#endif

H
Heiko Carstens 已提交
1251 1252
	.section .rodata, "a"
#define SYSCALL(esame,emu)	.long esame
1253
	.globl	sys_call_table
L
Linus Torvalds 已提交
1254 1255 1256 1257
sys_call_table:
#include "syscalls.S"
#undef SYSCALL

1258
#ifdef CONFIG_COMPAT
L
Linus Torvalds 已提交
1259

H
Heiko Carstens 已提交
1260
#define SYSCALL(esame,emu)	.long emu
1261
	.globl	sys_call_table_emu
L
Linus Torvalds 已提交
1262 1263 1264 1265
sys_call_table_emu:
#include "syscalls.S"
#undef SYSCALL
#endif