Commit ae6aa2ea authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Linus Torvalds
Browse files

[PATCH] s390: machine check handler bugs 



The new machine check handler still has a few bugs.

1) The system entry time has to be stored in the machine check handler,

2) the machine check return psw may not be stored at the usual place
   because it might overwrite the return psw of the interrupted context,

3) the return address for the call to s390_handle_mcck in the i/o interrupt
   handler is not correct,

4) the system call cleanup has to take the different save area of the
   machine check handler into account,

5) the machine check handler may not call UPDATE_VTIME before
   CREATE_STACK_FRAME, and

6) the io leave path needs a critical section cleanup to make sure that the
   TIF_MCCK_PENDING bit is really checked before switching back to user space.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 4c139862

arch/s390/kernel/entry.S

+88 −28
Original line number Diff line number Diff line
@@ -138,14 +138,14 @@ STACK_SIZE = 1 << STACK_SHIFT 
	st	%r12,__SF_BACKCHAIN(%r15)	# clear back chain

	.endm



	.macro  RESTORE_ALL sync

	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore

	.macro  RESTORE_ALL psworg,sync

	mvc	\psworg(8),SP_PSW(%r15) # move user PSW to lowcore

	.if !\sync

	ni	__LC_RETURN_PSW+1,0xfd	# clear wait state bit

	ni	\psworg+1,0xfd		# clear wait state bit

	.endif

	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user

	STORE_TIMER __LC_EXIT_TIMER

	lpsw	__LC_RETURN_PSW		# back to caller

	lpsw	\psworg			# back to caller

	.endm



/*
@@ -235,7 +235,7 @@ sysc_return: 
	tm	__TI_flags+3(%r9),_TIF_WORK_SVC

	bnz	BASED(sysc_work)  # there is work to do (signals etc.)

sysc_leave:

        RESTORE_ALL 1

        RESTORE_ALL __LC_RETURN_PSW,1



#

# recheck if there is more work to do
@@ -312,8 +312,6 @@ sysc_singlestep: 
	la	%r14,BASED(sysc_return)	# load adr. of system return

	br	%r1			# branch to do_single_step



__critical_end:



#

# call trace before and after sys_call

#
@@ -571,7 +569,8 @@ io_return: 
	tm	__TI_flags+3(%r9),_TIF_WORK_INT

	bnz	BASED(io_work)         # there is work to do (signals etc.)

io_leave:

        RESTORE_ALL 0

        RESTORE_ALL __LC_RETURN_PSW,0

io_done:



#ifdef CONFIG_PREEMPT

io_preempt:
@@ -621,7 +620,7 @@ io_work_loop: 
#

io_mcck_pending:

	l	%r1,BASED(.Ls390_handle_mcck)

	l	%r14,BASED(io_work_loop)

	la	%r14,BASED(io_work_loop)

	br	%r1		       # TIF bit will be cleared by handler



#
@@ -674,6 +673,8 @@ ext_no_vtime: 
	basr	%r14,%r1

	b	BASED(io_return)



__critical_end:



/*

 * Machine check handler routines

 */
@@ -681,6 +682,7 @@ ext_no_vtime: 
        .globl mcck_int_handler

mcck_int_handler:

	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer

	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA

	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs

	SAVE_ALL_BASE __LC_SAVE_AREA+32

	la	%r12,__LC_MCK_OLD_PSW
@@ -693,17 +695,8 @@ mcck_int_handler: 
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER

	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER

	mvc	__LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER

0:	tm	__LC_MCCK_CODE+2,0x08   # mwp of old psw valid?

	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical

	tm	__LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?

	bz	BASED(mcck_no_vtime)

	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER

	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER

	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER

mcck_no_vtime:

#endif

0:

	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?

0:	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?

	bno	BASED(mcck_int_main)	# no -> skip cleanup critical

	tm	__LC_MCK_OLD_PSW+1,0x01	# test problem state bit

	bnz	BASED(mcck_int_main)	# from user -> load async stack
@@ -720,6 +713,16 @@ mcck_int_main: 
	be	BASED(0f)

	l	%r15,__LC_PANIC_STACK	# load panic stack

0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	tm	__LC_MCCK_CODE+2,0x08   # mwp of old psw valid?

	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical

	tm	__LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?

	bz	BASED(mcck_no_vtime)

	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER

	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER

	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER

mcck_no_vtime:

#endif

	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct

	la	%r2,SP_PTREGS(%r15)	# load pt_regs

	l       %r1,BASED(.Ls390_mcck)
@@ -737,7 +740,7 @@ mcck_int_main: 
	l	%r1,BASED(.Ls390_handle_mcck)

	basr	%r14,%r1		# call machine check handler

mcck_return:

        RESTORE_ALL 0

        RESTORE_ALL __LC_RETURN_MCCK_PSW,0



#ifdef CONFIG_SMP

/*
@@ -803,6 +806,10 @@ cleanup_table_sysc_leave: 
	.long	sysc_leave + 0x80000000, sysc_work_loop + 0x80000000

cleanup_table_sysc_work_loop:

	.long	sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000

cleanup_table_io_leave:

	.long	io_leave + 0x80000000, io_done + 0x80000000

cleanup_table_io_work_loop:

	.long	io_work_loop + 0x80000000, io_mcck_pending + 0x80000000



cleanup_critical:

	clc	4(4,%r12),BASED(cleanup_table_system_call)
@@ -824,11 +831,27 @@ cleanup_critical: 
	bl	BASED(0f)

	clc	4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)

	bl	BASED(cleanup_sysc_return)

0:

	clc	4(4,%r12),BASED(cleanup_table_io_leave)

	bl	BASED(0f)

	clc	4(4,%r12),BASED(cleanup_table_io_leave+4)

	bl	BASED(cleanup_io_leave)

0:

	clc	4(4,%r12),BASED(cleanup_table_io_work_loop)

	bl	BASED(0f)

	clc	4(4,%r12),BASED(cleanup_table_io_work_loop+4)

	bl	BASED(cleanup_io_return)

0:

	br	%r14



cleanup_system_call:

	mvc	__LC_RETURN_PSW(8),0(%r12)

	c	%r12,BASED(.Lmck_old_psw)

	be	BASED(0f)

	la	%r12,__LC_SAVE_AREA+16

	b	BASED(1f)

0:	la	%r12,__LC_SAVE_AREA+32

1:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)

	bh	BASED(0f)
@@ -838,11 +861,13 @@ cleanup_system_call: 
#endif

	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)

	bh	BASED(0f)

	mvc	__LC_SAVE_AREA(16),__LC_SAVE_AREA+16

0:	st	%r13,__LC_SAVE_AREA+20

	mvc	__LC_SAVE_AREA(16),0(%r12)

0:	st	%r13,4(%r12)

	st	%r12,__LC_SAVE_AREA+48	# argh

	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1

	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA

	st	%r15,__LC_SAVE_AREA+28

	l	%r12,__LC_SAVE_AREA+48	# argh

	st	%r15,12(%r12)

	lh	%r7,0x8a

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

cleanup_vtime:
@@ -879,17 +904,21 @@ cleanup_sysc_return: 


cleanup_sysc_leave:

	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn)

	be	BASED(0f)

	be	BASED(2f)

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER

	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn+4)

	be	BASED(0f)

	be	BASED(2f)

#endif

	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)

	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)

	lm	%r0,%r11,SP_R0(%r15)

	c	%r12,BASED(.Lmck_old_psw)

	bne	BASED(0f)

	mvc	__LC_SAVE_AREA+32(16),SP_R12(%r15)

	b	BASED(1f)

0:	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)

1:	lm	%r0,%r11,SP_R0(%r15)

	l	%r15,SP_R15(%r15)

0:	la	%r12,__LC_RETURN_PSW

2:	la	%r12,__LC_RETURN_PSW

	br	%r14

cleanup_sysc_leave_insn:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
@@ -897,6 +926,36 @@ cleanup_sysc_leave_insn: 
#endif

	.long	sysc_leave + 10 + 0x80000000



cleanup_io_return:

	mvc	__LC_RETURN_PSW(4),0(%r12)

	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)

	la	%r12,__LC_RETURN_PSW

	br	%r14



cleanup_io_leave:

	clc	4(4,%r12),BASED(cleanup_io_leave_insn)

	be	BASED(2f)

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER

	clc	4(4,%r12),BASED(cleanup_io_leave_insn+4)

	be	BASED(2f)

#endif

	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)

	c	%r12,BASED(.Lmck_old_psw)

	bne	BASED(0f)

	mvc	__LC_SAVE_AREA+32(16),SP_R12(%r15)

	b	BASED(1f)

0:	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)

1:	lm	%r0,%r11,SP_R0(%r15)

	l	%r15,SP_R15(%r15)

2:	la	%r12,__LC_RETURN_PSW

	br	%r14

cleanup_io_leave_insn:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	.long	io_leave + 18 + 0x80000000

#endif

	.long	io_leave + 14 + 0x80000000



/*

 * Integer constants

 */
@@ -918,6 +977,7 @@ cleanup_sysc_leave_insn: 
.Ls390_mcck:   .long  s390_do_machine_check

.Ls390_handle_mcck:

	       .long  s390_handle_mcck

.Lmck_old_psw: .long  __LC_MCK_OLD_PSW

.Ldo_IRQ:      .long  do_IRQ

.Ldo_extint:   .long  do_extint

.Ldo_signal:   .long  do_signal

arch/s390/kernel/entry64.S

+86 −27
Original line number Diff line number Diff line
@@ -131,14 +131,14 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) 
	stg	%r12,__SF_BACKCHAIN(%r15)

        .endm



	.macro	RESTORE_ALL sync

	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore

	.macro	RESTORE_ALL psworg,sync

	mvc	\psworg(16),SP_PSW(%r15) # move user PSW to lowcore

	.if !\sync

	ni	__LC_RETURN_PSW+1,0xfd	# clear wait state bit

	ni	\psworg+1,0xfd		# clear wait state bit

	.endif

	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user

	STORE_TIMER __LC_EXIT_TIMER

	lpswe	__LC_RETURN_PSW		# back to caller

	lpswe	\psworg			# back to caller

	.endm



/*
@@ -233,7 +233,7 @@ sysc_return: 
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC

	jnz	sysc_work         # there is work to do (signals etc.)

sysc_leave:

        RESTORE_ALL 1

        RESTORE_ALL __LC_RETURN_PSW,1



#

# recheck if there is more work to do
@@ -308,8 +308,6 @@ sysc_singlestep: 
	jg	do_single_step		# branch to do_sigtrap





__critical_end:



#

# call syscall_trace before and after system call

# special linkage: %r12 contains the return address for trace_svc
@@ -612,7 +610,8 @@ io_return: 
	tm	__TI_flags+7(%r9),_TIF_WORK_INT

	jnz	io_work                # there is work to do (signals etc.)

io_leave:

        RESTORE_ALL 0

        RESTORE_ALL __LC_RETURN_PSW,0

io_done:



#ifdef CONFIG_PREEMPT

io_preempt:
@@ -711,6 +710,8 @@ ext_no_vtime: 
	brasl   %r14,do_extint

	j	io_return



__critical_end:



/*

 * Machine check handler routines

 */
@@ -718,6 +719,7 @@ ext_no_vtime: 
mcck_int_handler:

	la	%r1,4095		# revalidate r1

	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer

	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r1)

  	lmg     %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs

	SAVE_ALL_BASE __LC_SAVE_AREA+64

	la	%r12,__LC_MCK_OLD_PSW
@@ -730,17 +732,8 @@ mcck_int_handler: 
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER

	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER

	mvc	__LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER

0:	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?

	jno	mcck_no_vtime		# no -> no timer update

	tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?

	jz	mcck_no_vtime

	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER

	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER

	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER

mcck_no_vtime:

#endif

0:

	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?

0:	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?

	jno	mcck_int_main		# no -> skip cleanup critical

	tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit

	jnz	mcck_int_main		# from user -> load kernel stack
@@ -756,6 +749,16 @@ mcck_int_main: 
	jz	0f

	lg      %r15,__LC_PANIC_STACK   # load panic stack

0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?

	jno	mcck_no_vtime		# no -> no timer update

	tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?

	jz	mcck_no_vtime

	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER

	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER

	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER

mcck_no_vtime:

#endif

	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct

	la	%r2,SP_PTREGS(%r15)	# load pt_regs

	brasl	%r14,s390_do_machine_check
@@ -771,7 +774,7 @@ mcck_int_main: 
	jno	mcck_return

	brasl	%r14,s390_handle_mcck

mcck_return:

        RESTORE_ALL 0

        RESTORE_ALL __LC_RETURN_MCCK_PSW,0



#ifdef CONFIG_SMP

/*
@@ -833,6 +836,10 @@ cleanup_table_sysc_leave: 
	.quad	sysc_leave, sysc_work_loop

cleanup_table_sysc_work_loop:

	.quad	sysc_work_loop, sysc_reschedule

cleanup_table_io_leave:

	.quad	io_leave, io_done

cleanup_table_io_work_loop:

	.quad	io_work_loop, io_mcck_pending



cleanup_critical:

	clc	8(8,%r12),BASED(cleanup_table_system_call)
@@ -854,11 +861,27 @@ cleanup_critical: 
	jl	0f

	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)

	jl	cleanup_sysc_return

0:

	clc	8(8,%r12),BASED(cleanup_table_io_leave)

	jl	0f

	clc	8(8,%r12),BASED(cleanup_table_io_leave+8)

	jl	cleanup_io_leave

0:

	clc	8(8,%r12),BASED(cleanup_table_io_work_loop)

	jl	0f

	clc	8(8,%r12),BASED(cleanup_table_io_work_loop+8)

	jl	cleanup_io_return

0:

	br	%r14



cleanup_system_call:

	mvc	__LC_RETURN_PSW(16),0(%r12)

	cghi	%r12,__LC_MCK_OLD_PSW

	je	0f

	la	%r12,__LC_SAVE_AREA+32

	j	1f

0:	la	%r12,__LC_SAVE_AREA+64

1:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)

	jh	0f
@@ -868,11 +891,13 @@ cleanup_system_call: 
#endif

	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)

	jh	0f

	mvc	__LC_SAVE_AREA(32),__LC_SAVE_AREA+32

0:	stg	%r13,__LC_SAVE_AREA+40

	mvc	__LC_SAVE_AREA(32),0(%r12)

0:	stg	%r13,8(%r12)

	stg	%r12,__LC_SAVE_AREA+96	# argh

	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1

	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA

	stg	%r15,__LC_SAVE_AREA+56

	lg	%r12,__LC_SAVE_AREA+96	# argh

	stg	%r15,24(%r12)

	llgh	%r7,__LC_SVC_INT_CODE

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

cleanup_vtime:
@@ -909,17 +934,21 @@ cleanup_sysc_return: 


cleanup_sysc_leave:

	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn)

	je	0f

	je	2f

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER

	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn+8)

	je	0f

	je	2f

#endif

	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)

	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)

	lmg	%r0,%r11,SP_R0(%r15)

	cghi	%r12,__LC_MCK_OLD_PSW

	jne	0f

	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)

	j	1f

0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)

1:	lmg	%r0,%r11,SP_R0(%r15)

	lg	%r15,SP_R15(%r15)

0:	la	%r12,__LC_RETURN_PSW

2:	la	%r12,__LC_RETURN_PSW

	br	%r14

cleanup_sysc_leave_insn:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
@@ -927,6 +956,36 @@ cleanup_sysc_leave_insn: 
#endif

	.quad	sysc_leave + 12



cleanup_io_return:

	mvc	__LC_RETURN_PSW(8),0(%r12)

	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)

	la	%r12,__LC_RETURN_PSW

	br	%r14



cleanup_io_leave:

	clc	8(8,%r12),BASED(cleanup_io_leave_insn)

	je	2f

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER

	clc	8(8,%r12),BASED(cleanup_io_leave_insn+8)

	je	2f

#endif

	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)

	cghi	%r12,__LC_MCK_OLD_PSW

	jne	0f

	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)

	j	1f

0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)

1:	lmg	%r0,%r11,SP_R0(%r15)

	lg	%r15,SP_R15(%r15)

2:	la	%r12,__LC_RETURN_PSW

	br	%r14

cleanup_io_leave_insn:

#ifdef CONFIG_VIRT_CPU_ACCOUNTING

	.quad	io_leave + 20

#endif

	.quad	io_leave + 16



/*

 * Integer constants

 */

drivers/s390/s390mach.c

+1 −1
Original line number Diff line number Diff line
@@ -240,7 +240,7 @@ s390_revalidate_registers(struct mci *mci) 
			 * Floating point control register can't be restored.

			 * Task will be terminated.

			 */

			asm volatile ("lfpc 0(%0)" : : "a" (&zero));

			asm volatile ("lfpc 0(%0)" : : "a" (&zero), "m" (zero));

			kill_task = 1;



		}

include/asm-s390/lowcore.h

+6 −2
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ 
#define __LC_SYSTEM_TIMER		0x270

#define __LC_LAST_UPDATE_CLOCK		0x278

#define __LC_STEAL_CLOCK		0x280

#define __LC_RETURN_MCCK_PSW            0x288

#define __LC_KERNEL_STACK               0xC40

#define __LC_THREAD_INFO		0xC44

#define __LC_ASYNC_STACK                0xC48
@@ -90,6 +91,7 @@ 
#define __LC_SYSTEM_TIMER		0x278

#define __LC_LAST_UPDATE_CLOCK		0x280

#define __LC_STEAL_CLOCK		0x288

#define __LC_RETURN_MCCK_PSW            0x290

#define __LC_KERNEL_STACK               0xD40

#define __LC_THREAD_INFO		0xD48

#define __LC_ASYNC_STACK                0xD50
@@ -196,7 +198,8 @@ struct _lowcore 
	__u64        system_timer;             /* 0x270 */

	__u64        last_update_clock;        /* 0x278 */

	__u64        steal_clock;              /* 0x280 */

	__u8         pad8[0xc00-0x288];        /* 0x288 */

        psw_t        return_mcck_psw;          /* 0x288 */

	__u8         pad8[0xc00-0x290];        /* 0x290 */



        /* System info area */

	__u32        save_area[16];            /* 0xc00 */
@@ -285,7 +288,8 @@ struct _lowcore 
	__u64        system_timer;             /* 0x278 */

	__u64        last_update_clock;        /* 0x280 */

	__u64        steal_clock;              /* 0x288 */

        __u8         pad8[0xc00-0x290];        /* 0x290 */

        psw_t        return_mcck_psw;          /* 0x290 */

        __u8         pad8[0xc00-0x2a0];        /* 0x2a0 */

        /* System info area */

	__u64        save_area[16];            /* 0xc00 */

        __u8         pad9[0xd40-0xc80];        /* 0xc80 */

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