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Diffstat (limited to 'arch/s390/kvm/sie64a.S')
| -rw-r--r-- | arch/s390/kvm/sie64a.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/s390/kvm/sie64a.S b/arch/s390/kvm/sie64a.S new file mode 100644 index 00000000..5faa1b1b --- /dev/null +++ b/arch/s390/kvm/sie64a.S @@ -0,0 +1,98 @@ +/* + * sie64a.S - low level sie call + * + * Copyright IBM Corp. 2008,2010 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (version 2 only) + * as published by the Free Software Foundation. + * + * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> + * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> + */ + +#include <linux/errno.h> +#include <asm/asm-offsets.h> +#include <asm/setup.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/thread_info.h> + +_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) + +/* + * offsets into stackframe + * SP_ = offsets into stack sie64 is called with + * SPI_ = offsets into irq stack + */ +SP_GREGS = __SF_EMPTY +SP_HOOK = __SF_EMPTY+8 +SP_GPP = __SF_EMPTY+16 +SPI_PSW = STACK_FRAME_OVERHEAD + __PT_PSW + + + .macro SPP newpp + tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP + jz 0f + .insn s,0xb2800000,\newpp +0: + .endm + +sie_irq_handler: + SPP __LC_CMF_HPP # set host id + larl %r2,sie_inst + clg %r2,SPI_PSW+8(0,%r15) # intercepted sie + jne 1f + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + lg %r2,__LC_THREAD_INFO # pointer thread_info struct + tm __TI_flags+7(%r2),_TIF_EXIT_SIE + jz 0f + larl %r2,sie_exit # work pending, leave sie + stg %r2,SPI_PSW+8(0,%r15) + br %r14 +0: larl %r2,sie_reenter # re-enter with guest id + stg %r2,SPI_PSW+8(0,%r15) +1: br %r14 + +/* + * sie64a calling convention: + * %r2 pointer to sie control block + * %r3 guest register save area + */ + .globl sie64a +sie64a: + stg %r3,SP_GREGS(%r15) # save guest register save area + stmg %r6,%r14,__SF_GPRS(%r15) # save registers on entry + lgr %r14,%r2 # pointer to sie control block + larl %r5,sie_irq_handler + stg %r2,SP_GPP(%r15) + stg %r5,SP_HOOK(%r15) # save hook target + lmg %r0,%r13,0(%r3) # load guest gprs 0-13 +sie_reenter: + mvc __LC_SIE_HOOK(8),SP_HOOK(%r15) + SPP SP_GPP(%r15) # set guest id +sie_inst: + sie 0(%r14) + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + SPP __LC_CMF_HPP # set host id +sie_exit: + lg %r14,SP_GREGS(%r15) + stmg %r0,%r13,0(%r14) # save guest gprs 0-13 + lghi %r2,0 + lmg %r6,%r14,__SF_GPRS(%r15) + br %r14 + +sie_err: + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + SPP __LC_CMF_HPP # set host id + lg %r14,SP_GREGS(%r15) + stmg %r0,%r13,0(%r14) # save guest gprs 0-13 + lghi %r2,-EFAULT + lmg %r6,%r14,__SF_GPRS(%r15) + br %r14 + + .section __ex_table,"a" + .quad sie_inst,sie_err + .quad sie_exit,sie_err + .quad sie_reenter,sie_err + .previous |