Subversion Repositories openrisc_me

/*

Copyright (c) 2005,2008 Red Hat Incorporated.
All rights reserved.

Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions are met: 

    Redistributions of source code must retain the above copyright 
    notice, this list of conditions and the following disclaimer.

    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

    The name of Red Hat Incorporated may not be used to endorse 
    or promote products derived from this software without specific 
    prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED.  IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

*/

#if defined(__r8c_cpu__) || defined(__m16c_cpu__)
#define A16
#define A(n,w) n
#define W w
#define ALIGN 1
#else
#define A24
#define A(n,w) w
#define W l
#define ALIGN 2
#endif

        .section ".resetvec","ax",@progbits
        .long   _start

        .text

        .global _start
_start:
.LFB2:
        fclr    U       /* One stack for user and interrupts */
        ldc     #__stack,sp

#ifdef A16
        mov.b   #%hi8(__romdatastart),r1h
        mov.w   #%lo16(__romdatastart),a0
        mov.w   #__datastart,a1
#else
        mov.l   #__romdatastart,a0
        mov.l   #__datastart,a1
#endif
        mov.w   #__romdatacopysize,r3
        shl.w   #-1,r3
        smovf.w

#ifdef A16
        mov.w   #__bssstart,a1
#else
        mov.l   #__bssstart,a1
#endif
        mov.w   #__bsssize,r3
        shl.w   #-1,r3
        mov.w   #0,r0
        sstr.w

#ifdef A16
        ldc     #%lo16(__var_vects),intbl
        ldc     #%hi16(__var_vects),intbh
#else
        ldc     #__var_vects,intb
#endif

        fset    I
        jsr.a   __m32c_init

        jsr.a   _main
.LFE2:

#ifdef A24
        /* rv in r0, ok for arg0 */
#else
        mov.w   r0,r1
#endif

        jsr.a   _exit

        .text

        .global _m32c_run_preinit_array
        .type   _m32c_run_preinit_array,@function
_m32c_run_preinit_array:
        mov.W   #__preinit_array_start,a0
        mov.W   #__preinit_array_end,a1
        jmp.w   _m32c_run_inilist

        .global _m32c_run_init_array
        .type   _m32c_run_init_array,@function
_m32c_run_init_array:
        mov.W   #__init_array_start,a0
        mov.W   #__init_array_end,a1
        jmp.w   _m32c_run_inilist

        .global _m32c_run_fini_array
        .type   _m32c_run_fini_array,@function
_m32c_run_fini_array:
        mov.W   #__fini_array_start,a0
        mov.W   #__fini_array_end,a1
        /* fall through */

_m32c_run_inilist:
next_inilist:
        cmp.W   a0,a1
        jeq     done_inilist
        pushm   a0,a1
        mov.W   [a0],a0
#ifdef A16
        mov.b:s #0,a1   /* zero extends */
        jsri.a  a1a0
#else
        jsri.a  a0
#endif
        popm    a0,a1
        add.W   A(#2,#4),a0
        jmp.b   next_inilist
done_inilist:
        rts

        .section        .init,"ax",@progbits

        .global __m32c_init
__m32c_init:
        enter   #0

        .section        .fini,"ax",@progbits

        .global __m32c_fini
__m32c_fini:
        enter   #0
        jsr.a   _m32c_run_fini_array


;;; Provide Dwarf unwinding information that will help GDB stop
;;; backtraces at the right place.  This is stolen from assembly
;;; code generated by GCC with -dA.
        .section        .debug_frame,"",@progbits
.Lframe0:
        .4byte  .LECIE0-.LSCIE0 ; Length of Common Information Entry
.LSCIE0:
        .4byte  0xffffffff      ; CIE Identifier Tag
        .byte   0x1     ; CIE Version
        .ascii "\0"     ; CIE Augmentation
        .uleb128 0x1    ; CIE Code Alignment Factor
        .sleb128 -1     ; CIE Data Alignment Factor
        .byte   0xd     ; CIE RA Column
        .byte   0xc     ; DW_CFA_def_cfa
        .uleb128 0xc
        .uleb128 0x3
        .byte   0x8d    ; DW_CFA_offset, column 0xd
        .uleb128 0x3
        .p2align ALIGN
.LECIE0:
.LSFDE0:
        .4byte  .LEFDE0-.LASFDE0        ; FDE Length
.LASFDE0:
        .4byte  .Lframe0        ; FDE CIE offset
        .4byte  .LFB2           ; FDE initial location
        .4byte  .LFE2-.LFB2     ; FDE address range
        .byte   0xf             ; DW_CFA_def_cfa_expression
        .uleb128 1              ; length of expression
        .byte   0x30            ; DW_OP_lit0
        .p2align ALIGN
.LEFDE0:

        .text