verif/diag/assembly/include/syscall_handler.s

/*
* ========== Copyright Header Begin ==========================================
*
* OpenSPARC T2 Processor File: syscall_handler.s
* Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
* 4150 Network Circle, Santa Clara, California 95054, U.S.A.
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
* For the avoidance of doubt, and except that if any non-GPL license
* choice is available it will apply instead, Sun elects to use only
* the General Public License version 2 (GPLv2) at this time for any
* software where a choice of GPL license versions is made
* available with the language indicating that GPLv2 or any later version
* may be used, or where a choice of which version of the GPL is applied is
* otherwise unspecified.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*
* ========== Copyright Header End ============================================
*/
syscall_handler:
        ! get tpc/tnpc/tstate and save them
        rdpr    %tpc, %g1
        rdpr    %tnpc, %g2
        rdpr    %tstate, %g3
        stx     %g1, [%g4]      ! save tpc
        stx     %g2, [%g4+8]    ! save tnpc
        stx     %g3, [%g4+16]   ! save tstate
        setx    kernel_syscall, %g1, %g2
        wrpr    %g2, %g0, %tnpc
        sllx    %g3, 59, %g3    ! extract cwp from tstate
        srlx    %g3, 59, %g3
        setx    cregs_tstate_r64, %g1, %g2
        srlx    %g2, 5, %g2     ! remove cwp from cregs_tstate_r64
        sllx    %g2, 5, %g2
        or      %g3, %g2, %g3
        wrpr    %g3, %g0, %tstate

        ! get primary/secondary context and save them
        mov     0x8, %g1
        ldxa    [%g1] 0x21, %g2
        stx     %g2, [%g4+24]   ! save p context
        stxa    %g0, [%g1] 0x21 ! set p context to zero

        mov     0x10, %g1
        ldxa    [%g1] 0x21, %g3
        stx     %g3, [%g4+32]   ! save s context
        stxa    %g0, [%g1] 0x21 ! set s context to zero

        ! go to kernel
        done
        nop


sysret_handler:
        ! restore tpc/tnpc/tstate
        ldx     [%g4], %g1      ! get tpc
        ldx     [%g4+8], %g2    ! get tnpc
        ldx     [%g4+16], %g3   ! get tstate
        wrpr    %g1, %g0, %tpc
        wrpr    %g2, %g0, %tnpc
        wrpr    %g3, %g0, %tstate

        ! restore primary/secondary context
        mov     0x8, %g1
        ldx     [%g4+24], %g2   ! get p context
        stxa    %g2, [%g1] 0x21

        mov     0x10, %g1
        ldx     [%g4+32], %g3   ! get s context
        stxa    %g3, [%g1] 0x21

        ! return to user
        done
        nop