36 lines
1.1 KiB
ArmAsm
36 lines
1.1 KiB
ArmAsm
|
/*
|
||
|
|
* fido-hosted.S --
|
||
|
|
*
|
||
|
|
* Copyright (c) 2006 CodeSourcery Inc
|
||
|
|
*
|
||
|
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
||
|
|
* and license this software and its documentation for any purpose, provided
|
||
|
|
* that existing copyright notices are retained in all copies and that this
|
||
|
|
* notice is included verbatim in any distributions. No written agreement,
|
||
|
|
* license, or royalty fee is required for any of the authorized uses.
|
||
|
|
* Modifications to this software may be copyrighted by their authors
|
||
|
|
* and need not follow the licensing terms described here, provided that
|
||
|
|
* the new terms are clearly indicated on the first page of each file where
|
||
|
|
* they apply.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Semihosting function. The debugger intercepts the halt, and
|
||
|
|
determines that it is followed by the sentinel pattern. */
|
||
|
|
|
||
|
|
.globl __hosted
|
||
|
|
__hosted:
|
||
|
|
linkw %fp,#0
|
||
|
|
movel %fp@(8),%d0
|
||
|
|
movel %fp@(12),%d1
|
||
|
|
.align 4
|
||
|
|
nop
|
||
|
|
bkpt #0
|
||
|
|
|
||
|
|
/* This sentinel instruction value must be immediately after
|
||
|
|
the bkpt instruction. The debugger will adjust the pc, so
|
||
|
|
that it is never executed. This instruction is
|
||
|
|
'movec %sp,0'. */
|
||
|
|
.long 0x4e7bf000
|
||
|
|
unlk %fp
|
||
|
|
rts
|