Subversion Repositories openrisc

/* Copyright (c) 2008, 2009 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.  */

        .text

        .global _start

_start:

.LFB2:

        mvtc    #0, psw

        /* Enable the DN bit - this should have been done for us by

           the CPU reset, but it is best to make sure for ourselves.  */

        mvtc    #0x100, fpsw

        mov     #__stack, r0

        mvtc    #__vectors, intb

        mov     #__datastart, r1

        mov     #__romdatastart, r2

        mov     #__romdatacopysize, r3

        smovf

        mov     #__bssstart, r1

        mov     #0, r2

        mov     #__bsssize, r3

        sstr.l

        /* Initialise the small data area pointer.

           The register used here must agree with the definition of

           GP_BASE_REGNUM in gcc/config/rx/rx.h.  */

        mov     #__gp, r13

        bsr.a   __rx_init

#ifdef PROFILE_SUPPORT  /* Defined in gcrt0.S.  */

        mov     # _start, r1

        mov     # _etext, r2

        bsr.a   __monstartup

#endif

        mov     #0, r1 /* argc */

        mov     #0, r2 /* argv */

        mov     #0, r3 /* envv */

        bsr.a   _main

.LFE2:

#ifdef PROFILE_SUPPORT

        mov      r1, r13       ; Save return code.

        bsr.a   __mcleanup

        mov     r13, r1

#endif

        bsr.a   _exit

        .global _rx_run_preinit_array

        .type   _rx_run_preinit_array,@function

_rx_run_preinit_array:

        mov     #__preinit_array_start,r1

        mov     #__preinit_array_end,r2

        bra.a   _rx_run_inilist

        .global _rx_run_init_array

        .type   _rx_run_init_array,@function

_rx_run_init_array:

        mov     #__init_array_start,r1

        mov     #__init_array_end,r2

        mov     #4, r3

        bra.a   _rx_run_inilist

        .global _rx_run_fini_array

        .type   _rx_run_fini_array,@function

_rx_run_fini_array:

        mov     #__fini_array_start,r2

        mov     #__fini_array_end,r1

        mov     #-4, r3

        /* fall through */

_rx_run_inilist:

next_inilist:

        cmp     r1,r2

        beq.b   done_inilist

        mov.l   [r1],r4

        cmp     #-1, r4

        beq.b   skip_inilist

        cmp     #0, r4

        beq.b   skip_inilist

        pushm   r1-r3

        jsr     r4

        popm    r1-r3

skip_inilist:

        add     r3,r1

        bra.b   next_inilist

done_inilist:

        rts

        .section        .init,"ax"

        .global __rx_init

__rx_init:

        .section        .fini,"ax"

        .global __rx_fini

__rx_fini:

        bsr.a   _rx_run_fini_array

        .section .sdata

        .balign 4

        .global __gp

        .weak   __gp

__gp:

        .section .data

        .global ___dso_handle

        .weak   ___dso_handle

___dso_handle:

        .long   0

;;; 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 2

.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 2

.LEFDE0:

        .text