arch/ia64/kernel/paravirtentry.S

   1 /******************************************************************************
   2  * linux/arch/ia64/xen/paravirtentry.S
   3  *
   4  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #include <asm/asmmacro.h>
  24 #include <asm/asm-offsets.h>
  25 #include "entry.h"
  26
  27 #define DATA8(sym, init_value)                  \
  28         .pushsection .data.read_mostly ;        \
  29         .align 8 ;                              \
  30         .global sym ;                           \
  31         sym: ;                                  \
  32         data8 init_value ;                      \
  33         .popsection
  34
  35 #define BRANCH(targ, reg, breg)         \
  36         movl reg=targ ;                 \
  37         ;;                              \
  38         ld8 reg=[reg] ;                 \
  39         ;;                              \
  40         mov breg=reg ;                  \
  41         br.cond.sptk.many breg
  42
  43 #define BRANCH_PROC(sym, reg, breg)                             \
  44         DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
  45         GLOBAL_ENTRY(paravirt_ ## sym) ;                        \
  46                 BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;  \
  47         END(paravirt_ ## sym)
  48
  49 #define BRANCH_PROC_UNWINFO(sym, reg, breg)                     \
  50         DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
  51         GLOBAL_ENTRY(paravirt_ ## sym) ;                        \
  52                 PT_REGS_UNWIND_INFO(0) ;                        \
  53                 BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;  \
  54         END(paravirt_ ## sym)
  55
  56
  57 BRANCH_PROC(switch_to, r22, b7)
  58 BRANCH_PROC_UNWINFO(leave_syscall, r22, b7)
  59 BRANCH_PROC(work_processed_syscall, r2, b7)
  60 BRANCH_PROC_UNWINFO(leave_kernel, r22, b7)