[mirror_ubuntu-bionic-kernel.git] / arch / s390 / kernel / base.S

/*
 *  arch/s390/kernel/base.S
 *
 *    Copyright IBM Corp. 2006,2007
 *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 *		 Michael Holzheu <holzheu@de.ibm.com>
 */

#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>

#ifdef CONFIG_64BIT

ENTRY(s390_base_mcck_handler)
	basr	%r13,0
0:	lg	%r15,__LC_PANIC_STACK	# load panic stack
	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_mcck_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	la	%r1,4095
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
	lpswe	__LC_MCK_OLD_PSW

	.section .bss
	.align 8
	.globl	s390_base_mcck_handler_fn
s390_base_mcck_handler_fn:
	.quad	0
	.previous

ENTRY(s390_base_ext_handler)
	stmg	%r0,%r15,__LC_SAVE_AREA
	basr	%r13,0
0:	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_ext_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lmg	%r0,%r15,__LC_SAVE_AREA
	ni	__LC_EXT_OLD_PSW+1,0xfd	# clear wait state bit
	lpswe	__LC_EXT_OLD_PSW

	.section .bss
	.align 8
	.globl s390_base_ext_handler_fn
s390_base_ext_handler_fn:
	.quad	0
	.previous

ENTRY(s390_base_pgm_handler)
	stmg	%r0,%r15,__LC_SAVE_AREA
	basr	%r13,0
0:	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_pgm_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
	lmg	%r0,%r15,__LC_SAVE_AREA
	lpswe	__LC_PGM_OLD_PSW
1:	lpswe	disabled_wait_psw-0b(%r13)

	.align	8
disabled_wait_psw:
	.quad	0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler

	.section .bss
	.align 8
	.globl s390_base_pgm_handler_fn
s390_base_pgm_handler_fn:
	.quad	0
	.previous

#
# Calls diag 308 subcode 1 and continues execution
#
# The following conditions must be ensured before calling this function:
# * Prefix register = 0
# * Lowcore protection is disabled
#
ENTRY(diag308_reset)
	larl	%r4,.Lctlregs		# Save control registers
	stctg	%c0,%c15,0(%r4)
	larl	%r4,.Lfpctl		# Floating point control register
	stfpc	0(%r4)
	larl	%r4,.Lrestart_psw	# Setup restart PSW at absolute 0
	lghi	%r3,0
	lg	%r4,0(%r4)		# Save PSW
	sturg	%r4,%r3			# Use sturg, because of large pages
	lghi	%r1,1
	diag	%r1,%r1,0x308
.Lrestart_part2:
	lhi	%r0,0			# Load r0 with zero
	lhi	%r1,2			# Use mode 2 = ESAME (dump)
	sigp	%r1,%r0,0x12		# Switch to ESAME mode
	sam64				# Switch to 64 bit addressing mode
	larl	%r4,.Lctlregs		# Restore control registers
	lctlg	%c0,%c15,0(%r4)
	larl	%r4,.Lfpctl		# Restore floating point ctl register
	lfpc	0(%r4)
	br	%r14
.align 16
.Lrestart_psw:
	.long	0x00080000,0x80000000 + .Lrestart_part2

	.section .bss
.align 8
.Lctlregs:
	.rept	16
	.quad	0
	.endr
.Lfpctl:
	.long	0
	.previous

#else /* CONFIG_64BIT */

ENTRY(s390_base_mcck_handler)
	basr	%r13,0
0:	l	%r15,__LC_PANIC_STACK	# load panic stack
	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA
	lpsw	__LC_MCK_OLD_PSW

2:	.long	s390_base_mcck_handler_fn

	.section .bss
	.align 4
	.globl	s390_base_mcck_handler_fn
s390_base_mcck_handler_fn:
	.long	0
	.previous

ENTRY(s390_base_ext_handler)
	stm	%r0,%r15,__LC_SAVE_AREA
	basr	%r13,0
0:	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lm	%r0,%r15,__LC_SAVE_AREA
	ni	__LC_EXT_OLD_PSW+1,0xfd	# clear wait state bit
	lpsw	__LC_EXT_OLD_PSW

2:	.long	s390_base_ext_handler_fn

	.section .bss
	.align 4
	.globl	s390_base_ext_handler_fn
s390_base_ext_handler_fn:
	.long	0
	.previous

ENTRY(s390_base_pgm_handler)
	stm	%r0,%r15,__LC_SAVE_AREA
	basr	%r13,0
0:	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
	lm	%r0,%r15,__LC_SAVE_AREA
	lpsw	__LC_PGM_OLD_PSW

1:	lpsw	disabled_wait_psw-0b(%r13)

2:	.long	s390_base_pgm_handler_fn

disabled_wait_psw:
	.align	8
	.long	0x000a0000,0x00000000 + s390_base_pgm_handler

	.section .bss
	.align 4
	.globl	s390_base_pgm_handler_fn
s390_base_pgm_handler_fn:
	.long	0
	.previous

#endif /* CONFIG_64BIT */
Commit	Line	Data
ab14de6c HC	1	/*
	2	* arch/s390/kernel/base.S
	3	*
	4	* Copyright IBM Corp. 2006,2007
	5	* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
	6	* Michael Holzheu <holzheu@de.ibm.com>
	7	*/
	8
144d634a	9	#include <linux/linkage.h>
cbb870c8	10	#include <asm/asm-offsets.h>
ab14de6c	11	#include <asm/ptrace.h>
ab14de6c HC	12
	13	#ifdef CONFIG_64BIT
	14
144d634a	15	ENTRY(s390_base_mcck_handler)
ab14de6c HC	16	basr %r13,0
	17	0: lg %r15,__LC_PANIC_STACK # load panic stack
	18	aghi %r15,-STACK_FRAME_OVERHEAD
	19	larl %r1,s390_base_mcck_handler_fn
	20	lg %r1,0(%r1)
	21	ltgr %r1,%r1
	22	jz 1f
	23	basr %r14,%r1
	24	1: la %r1,4095
	25	lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
	26	lpswe __LC_MCK_OLD_PSW
	27
	28	.section .bss
144d634a	29	.align 8
ab14de6c HC	30	.globl s390_base_mcck_handler_fn
	31	s390_base_mcck_handler_fn:
	32	.quad 0
	33	.previous
	34
144d634a	35	ENTRY(s390_base_ext_handler)
ab14de6c HC	36	stmg %r0,%r15,__LC_SAVE_AREA
	37	basr %r13,0
	38	0: aghi %r15,-STACK_FRAME_OVERHEAD
	39	larl %r1,s390_base_ext_handler_fn
	40	lg %r1,0(%r1)
	41	ltgr %r1,%r1
	42	jz 1f
	43	basr %r14,%r1
	44	1: lmg %r0,%r15,__LC_SAVE_AREA
	45	ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
	46	lpswe __LC_EXT_OLD_PSW
	47
	48	.section .bss
144d634a	49	.align 8
ab14de6c HC	50	.globl s390_base_ext_handler_fn
	51	s390_base_ext_handler_fn:
	52	.quad 0
	53	.previous
	54
144d634a	55	ENTRY(s390_base_pgm_handler)
ab14de6c HC	56	stmg %r0,%r15,__LC_SAVE_AREA
	57	basr %r13,0
	58	0: aghi %r15,-STACK_FRAME_OVERHEAD
	59	larl %r1,s390_base_pgm_handler_fn
	60	lg %r1,0(%r1)
	61	ltgr %r1,%r1
	62	jz 1f
	63	basr %r14,%r1
	64	lmg %r0,%r15,__LC_SAVE_AREA
	65	lpswe __LC_PGM_OLD_PSW
	66	1: lpswe disabled_wait_psw-0b(%r13)
	67
	68	.align 8
	69	disabled_wait_psw:
	70	.quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
	71
	72	.section .bss
144d634a	73	.align 8
ab14de6c HC	74	.globl s390_base_pgm_handler_fn
	75	s390_base_pgm_handler_fn:
	76	.quad 0
	77	.previous
	78
9dc7356e MH	79	#
	80	# Calls diag 308 subcode 1 and continues execution
	81	#
	82	# The following conditions must be ensured before calling this function:
	83	# * Prefix register = 0
	84	# * Lowcore protection is disabled
	85	#
	86	ENTRY(diag308_reset)
	87	larl %r4,.Lctlregs # Save control registers
	88	stctg %c0,%c15,0(%r4)
60a0c68d MH	89	larl %r4,.Lfpctl # Floating point control register
60a0c68d MH	90	stfpc 0(%r4)
9dc7356e MH	91	larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
	92	lghi %r3,0
	93	lg %r4,0(%r4) # Save PSW
	94	sturg %r4,%r3 # Use sturg, because of large pages
	95	lghi %r1,1
	96	diag %r1,%r1,0x308
	97	.Lrestart_part2:
	98	lhi %r0,0 # Load r0 with zero
	99	lhi %r1,2 # Use mode 2 = ESAME (dump)
	100	sigp %r1,%r0,0x12 # Switch to ESAME mode
	101	sam64 # Switch to 64 bit addressing mode
	102	larl %r4,.Lctlregs # Restore control registers
	103	lctlg %c0,%c15,0(%r4)
60a0c68d MH	104	larl %r4,.Lfpctl # Restore floating point ctl register
60a0c68d MH	105	lfpc 0(%r4)
9dc7356e MH	106	br %r14
	107	.align 16
	108	.Lrestart_psw:
	109	.long 0x00080000,0x80000000 + .Lrestart_part2
	110
	111	.section .bss
	112	.align 8
	113	.Lctlregs:
	114	.rept 16
	115	.quad 0
	116	.endr
60a0c68d MH	117	.Lfpctl:
60a0c68d MH	118	.long 0
9dc7356e MH	119	.previous
9dc7356e MH	120
ab14de6c HC	121	#else /* CONFIG_64BIT */
ab14de6c HC	122
144d634a	123	ENTRY(s390_base_mcck_handler)
ab14de6c HC	124	basr %r13,0
	125	0: l %r15,__LC_PANIC_STACK # load panic stack
	126	ahi %r15,-STACK_FRAME_OVERHEAD
	127	l %r1,2f-0b(%r13)
	128	l %r1,0(%r1)
	129	ltr %r1,%r1
	130	jz 1f
	131	basr %r14,%r1
	132	1: lm %r0,%r15,__LC_GPREGS_SAVE_AREA
	133	lpsw __LC_MCK_OLD_PSW
	134
	135	2: .long s390_base_mcck_handler_fn
	136
	137	.section .bss
144d634a	138	.align 4
ab14de6c HC	139	.globl s390_base_mcck_handler_fn
	140	s390_base_mcck_handler_fn:
	141	.long 0
	142	.previous
	143
144d634a	144	ENTRY(s390_base_ext_handler)
ab14de6c HC	145	stm %r0,%r15,__LC_SAVE_AREA
	146	basr %r13,0
	147	0: ahi %r15,-STACK_FRAME_OVERHEAD
	148	l %r1,2f-0b(%r13)
	149	l %r1,0(%r1)
	150	ltr %r1,%r1
	151	jz 1f
	152	basr %r14,%r1
	153	1: lm %r0,%r15,__LC_SAVE_AREA
	154	ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
	155	lpsw __LC_EXT_OLD_PSW
	156
	157	2: .long s390_base_ext_handler_fn
	158
	159	.section .bss
144d634a	160	.align 4
ab14de6c HC	161	.globl s390_base_ext_handler_fn
	162	s390_base_ext_handler_fn:
	163	.long 0
	164	.previous
	165
144d634a	166	ENTRY(s390_base_pgm_handler)
ab14de6c HC	167	stm %r0,%r15,__LC_SAVE_AREA
	168	basr %r13,0
	169	0: ahi %r15,-STACK_FRAME_OVERHEAD
	170	l %r1,2f-0b(%r13)
	171	l %r1,0(%r1)
	172	ltr %r1,%r1
	173	jz 1f
	174	basr %r14,%r1
	175	lm %r0,%r15,__LC_SAVE_AREA
	176	lpsw __LC_PGM_OLD_PSW
	177
	178	1: lpsw disabled_wait_psw-0b(%r13)
	179
	180	2: .long s390_base_pgm_handler_fn
	181
	182	disabled_wait_psw:
	183	.align 8
	184	.long 0x000a0000,0x00000000 + s390_base_pgm_handler
	185
	186	.section .bss
144d634a	187	.align 4
ab14de6c HC	188	.globl s390_base_pgm_handler_fn
	189	s390_base_pgm_handler_fn:
	190	.long 0
	191	.previous
	192
	193	#endif /* CONFIG_64BIT */