| /* |
| * 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,__LC_RETURN_PSW+8 |
| br %r14 |
| 0: larl %r2,sie_reenter # re-enter with guest id |
| stg %r2,__LC_RETURN_PSW+8 |
| 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 |
| .previous |