diff options
Diffstat (limited to 'firmware/decompressor/startup.S')
| -rwxr-xr-x | firmware/decompressor/startup.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/firmware/decompressor/startup.S b/firmware/decompressor/startup.S new file mode 100755 index 0000000000..62efef9cc3 --- /dev/null +++ b/firmware/decompressor/startup.S @@ -0,0 +1,57 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2005 by Jens Arnold + * based on crt0.S by Linus Nielsen Feltzing + * + * All files in this archive are subject to the GNU General Public License. + * See the file COPYING in the source tree root for full license agreement. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + .section .start,"ax",@progbits + .global _start +_start: + /* copy the .iram section */ + mov.l .iramcopy_k,r0 + mov.l .iram_k,r1 + mov.l .iramend_k,r2 + /* Note: We cannot put a PC relative load into the delay slot of a 'bra' + instruction (the offset would be wrong), but there is nothing else to + do before the loop, so the delay slot would be 'nop'. The cmp / bf + sequence is the same length, but more efficient. */ + cmp/hi r1,r2 + bf .noiramcopy +.iramloop: + mov.l @r0+,r3 + mov.l r3,@r1 + add #4,r1 + cmp/hi r1,r2 + bt .iramloop +.noiramcopy: + + /* call the mainline */ + mov.l .main_k,r0 + mov.l .stackend_k,r15 + jmp @r0 + nop + + .align 2 +.iramcopy_k: + .long _iramcopy +.iram_k: + .long _iramstart +.iramend_k: + .long _iramend +.stackend_k: + .long _stackend +.main_k: + .long _main |