Subversion Repositories openrisc_2011-10-31

/* setjmp.S. Implementation of setjmp.

   Copyright (C) 2010, Embecosm Limited <info@embecosm.com>

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Newlib.

   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; either version 3 of the License, or (at your option)
   any later version.

   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, see <http://www.gnu.org/licenses/>.            */
/* -------------------------------------------------------------------------- */
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen.                                                              */
/* -------------------------------------------------------------------------- */

        
/* -------------------------------------------------------------------------- */
/*!setjmp

   All processor state is saved in the buffer provided. We need not save r0
   (it will always be zero) and we need not save r11 (it will always be
   overridden here, and in longjmp).

   @todo We should prefer to save and restore the status register, but this is
         not directly possible in user code. There is some merit in code to
         set the flag, since in compiled C code, that might be expected to hold
         a value. We leave a space for this information for future enhancement.

   @param[out] env(r3)  A buffer to save all the current processor state.

   @return  zero.
/* -------------------------------------------------------------------------- */
        .align  4
        .global setjmp
        .type   setjmp,@function
setjmp:
        l.sw    4(r3),r1                /* Slot 0 saved for flag in future */
        l.sw    8(r3),r2
        l.sw    12(r3),r3
        l.sw    16(r3),r4
        l.sw    20(r3),r5
        l.sw    24(r3),r6
        l.sw    28(r3),r7
        l.sw    32(r3),r8
        l.sw    36(r3),r9
        l.sw    40(r3),r10              /* Skip r11 */
        l.sw    44(r3),r12
        l.sw    48(r3),r13
        l.sw    52(r3),r14
        l.sw    56(r3),r15
        l.sw    60(r3),r16
        l.sw    64(r3),r17
        l.sw    68(r3),r18
        l.sw    72(r3),r19
        l.sw    76(r3),r20
        l.sw    80(r3),r21
        l.sw    84(r3),r22
        l.sw    88(r3),r23
        l.sw    92(r3),r24
        l.sw    96(r3),r25
        l.sw    100(r3),r26
        l.sw    104(r3),r27
        l.sw    108(r3),r28
        l.sw    112(r3),r29
        l.sw    116(r3),r30
        l.sw    120(r3),r31

        l.jr    r9
        l.addi  r11,r0,0                /* Zero result */

        .size   setjmp, .-setjmp