diff options
Diffstat (limited to 'bsps/m32c/m32cbsp/start/start.S')
| -rw-r--r-- | bsps/m32c/m32cbsp/start/start.S | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/bsps/m32c/m32cbsp/start/start.S b/bsps/m32c/m32cbsp/start/start.S new file mode 100644 index 0000000000..e8268a7bec --- /dev/null +++ b/bsps/m32c/m32cbsp/start/start.S @@ -0,0 +1,183 @@ +/* + +Copyright (c) 2005 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 + + .text + + .global _start +_start: +.LFB2: + fset U /* User stack */ + 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 + + /* jsr.a __m32c_init */ + + jsr.a _boot_card +.LFE2: + +#ifdef A24 + /* rv in r0, ok for arg0 */ +#else + mov.w r0,r1 +#endif + + .global _bsp_reset +_bsp_reset: + jsr.a _sys_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 __init + .global __m32c_init +__init: +__m32c_init: + enter #0 + exitd + + .section .fini,"ax",@progbits + + .global __fini + .global __m32c_fini +__fini: +__m32c_fini: + enter #0 + jsr.a _m32c_run_fini_array + exitd + + +;;; 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 |