source: trunk/libs/newlib/src/libgloss/sparc_leon/regwin_slow.S @ 610

/*
 * Copyright (c) 2011 Aeroflex Gaisler
 *
 * BSD license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


#include <asm-leon/leon.h>
#include <asm-leon/leonstack.h>
#include <asm-leon/asmmacro.h>
        
  .seg    "text"

        
/* Number of register windows */
        .global _nwindows_min1, _nwindows
        
        ! Window overflow trap handler on save.
        ! Touches %g1
        /* ------- */
        .weak   _window_overflow
        .set    _window_overflow,__window_overflow
        .weak   _window_overflow_svt
        .set    _window_overflow_svt,__window_overflow_svt
        /* ------- */
        !.global _window_overflow,_window_overflow_svt
        .global __window_overflow_rettseq,__window_overflow_rettseq_ret,__window_overflow_slow1

__window_overflow_svt:          
__window_overflow:
#ifndef _FLAT
__window_overflow_rettseq:              
        mov  %wim, %l3                  ! Calculate next WIM
        mov  %g1, %l7           
        srl  %l3, 1, %g1        
        
__window_overflow_rettseq_ret:          
        sethi %hi(_nwindows_min1), %l4  ! NWINDOWS-1
        ld [%l4+%lo(_nwindows_min1)], %l4
        
        sll  %l3, %l4 , %l4
        or   %l4, %g1, %g1

        save                              ! Get into window to be saved.
        mov  %g1, %wim
        nop; nop; nop
        std   %l0, [%sp + 0];
        std   %l2, [%sp + 8];
        std   %l4, [%sp + 16]; 
        std   %l6, [%sp + 24]; 
        std   %i0, [%sp + 32]; 
        std   %i2, [%sp + 40]; 
        std   %i4, [%sp + 48]; 
        std   %i6, [%sp + 56]; 
        restore                         ! Go back to trap window.
        mov  %l7, %g1
        
        jmp  %l1                        ! Re-execute save.
        rett %l2
        nop
        
__window_overflow_slow1:                ! space for possible stackcheck patch
        nop
        nop
#else   
        ta      0                       ! halt 
__window_overflow_rettseq:              
__window_overflow_rettseq_ret:          
__window_overflow_slow1:                
        nop
        nop
        nop
#endif
        
  /* Window underflow trap handler on restore.  */

        ! Touches %g1
        /* ------- */
        .weak   _window_underflow
        .set    _window_underflow,__window_underflow
        .weak   _window_underflow_svt
        .set    _window_underflow_svt,__window_underflow_svt
        /* ------- */
        !.global  _window_underflow,_window_underflow_svt

__window_underflow_svt:
__window_underflow:
#ifndef _FLAT
        mov  %wim, %l3                  ! Calculate next WIM
        sll  %l3, 1, %l4

        sethi %hi(_nwindows_min1), %l5  ! NWINDOWS-1
        ld [%l5+%lo(_nwindows_min1)], %l5
        
        srl  %l3, %l5, %l5
        or   %l5, %l4, %l5
        mov  %l5, %wim
        nop; nop; nop
        restore                         ! Two restores to get into the
        restore                         ! window to restore
        ldd   [%sp + 0], %l0;           ! Restore window from the stack
        ldd   [%sp + 8], %l2; 
        ldd   [%sp + 16], %l4; 
        ldd   [%sp + 24], %l6; 
        ldd   [%sp + 32], %i0; 
        ldd   [%sp + 40], %i2; 
        ldd   [%sp + 48], %i4; 
        ldd   [%sp + 56], %i6; 
        save                            ! Get back to the trap window.
        save
        jmp  %l1                        ! Re-execute restore.
        rett  %l2
#else   
        ta      0                       ! halt 
#endif