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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kvm/sie64a.S
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/*

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 * sie64a.S - low level sie call

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 *

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 * Copyright IBM Corp. 2008,2010

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License (version 2 only)

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 * as published by the Free Software Foundation.

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 *

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 *    Author(s): Heiko Carstens <[email protected]>

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 *		 Christian Ehrhardt <[email protected]>

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 */

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#include <linux/errno.h>

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#include <asm/asm-offsets.h>

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#include <asm/setup.h>

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#include <asm/asm-offsets.h>

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#include <asm/ptrace.h>

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#include <asm/thread_info.h>

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_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)

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/*

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 * offsets into stackframe

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 * SP_	= offsets into stack sie64 is called with

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 * SPI_ = offsets into irq stack

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 */

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SP_GREGS = __SF_EMPTY

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SP_HOOK  = __SF_EMPTY+8

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SP_GPP	 = __SF_EMPTY+16

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SPI_PSW  = STACK_FRAME_OVERHEAD + __PT_PSW

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	.macro SPP newpp

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	tm	__LC_MACHINE_FLAGS+6,0x20	# MACHINE_FLAG_SPP

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	jz	0f

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	.insn	s,0xb2800000,\newpp

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0:

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	.endm

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sie_irq_handler:

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	SPP	__LC_CMF_HPP			# set host id

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	larl	%r2,sie_inst

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	clg	%r2,SPI_PSW+8(0,%r15)		# intercepted sie

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	jne	1f

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	xc	__LC_SIE_HOOK(8),__LC_SIE_HOOK

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	lg	%r2,__LC_THREAD_INFO		# pointer thread_info struct

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	tm	__TI_flags+7(%r2),_TIF_EXIT_SIE

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	jz	0f

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	larl	%r2,sie_exit			# work pending, leave sie

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	stg	%r2,SPI_PSW+8(0,%r15)

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	br	%r14

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0:	larl	%r2,sie_reenter			# re-enter with guest id

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	stg	%r2,SPI_PSW+8(0,%r15)

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1:	br	%r14

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/*

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 * sie64a calling convention:

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 * %r2 pointer to sie control block

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 * %r3 guest register save area

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 */

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	.globl	sie64a

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sie64a:

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	stg	%r3,SP_GREGS(%r15)		# save guest register save area

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	stmg	%r6,%r14,__SF_GPRS(%r15)	# save registers on entry

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	lgr	%r14,%r2			# pointer to sie control block

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	larl	%r5,sie_irq_handler

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	stg	%r2,SP_GPP(%r15)

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	stg	%r5,SP_HOOK(%r15)		# save hook target

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	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13

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sie_reenter:

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	mvc	__LC_SIE_HOOK(8),SP_HOOK(%r15)

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	SPP	SP_GPP(%r15)			# set guest id

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sie_inst:

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	sie	0(%r14)

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	xc	__LC_SIE_HOOK(8),__LC_SIE_HOOK

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	SPP	__LC_CMF_HPP			# set host id

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sie_exit:

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	lg	%r14,SP_GREGS(%r15)

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	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13

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	lghi	%r2,0

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	lmg	%r6,%r14,__SF_GPRS(%r15)

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	br	%r14

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sie_err:

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	xc	__LC_SIE_HOOK(8),__LC_SIE_HOOK

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	SPP	__LC_CMF_HPP			# set host id

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	lg	%r14,SP_GREGS(%r15)

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	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13

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	lghi	%r2,-EFAULT

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	lmg	%r6,%r14,__SF_GPRS(%r15)

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	br	%r14

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	.section __ex_table,"a"

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	.quad	sie_inst,sie_err

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	.quad	sie_exit,sie_err

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	.quad	sie_reenter,sie_err

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	.previous

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