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- /*
- * 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
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