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Last change
on this file since 686 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.1 KB
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| 1 | /* |
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| 2 | * cf-hosted.S -- |
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| 3 | * |
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| 4 | * Copyright (c) 2006 CodeSourcery Inc |
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| 5 | * |
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| 6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 7 | * and license this software and its documentation for any purpose, provided |
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| 8 | * that existing copyright notices are retained in all copies and that this |
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| 9 | * notice is included verbatim in any distributions. No written agreement, |
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| 10 | * license, or royalty fee is required for any of the authorized uses. |
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| 11 | * Modifications to this software may be copyrighted by their authors |
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| 12 | * and need not follow the licensing terms described here, provided that |
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| 13 | * the new terms are clearly indicated on the first page of each file where |
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| 14 | * they apply. |
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| 15 | */ |
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| 16 | |
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| 17 | /* Semihosting function. The debugger intercepts the halt, and |
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| 18 | determines that it is followed by the sentinel pattern. */ |
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| 19 | |
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| 20 | .globl __hosted |
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| 21 | __hosted: |
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| 22 | linkw %fp,#0 |
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| 23 | movel %fp@(8),%d0 |
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| 24 | movel %fp@(12),%d1 |
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| 25 | |
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| 26 | /* The semihosting sequence is 'nop; halt;sentinel' aligned to |
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| 27 | a 4 byte boundary. The sentinel is an ill formed instruction |
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| 28 | (movec %sp,0). The debugger will adjust the pc, so it is never |
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| 29 | executed. */ |
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| 30 | .balignw 4,0x4e71 |
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| 31 | nop |
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| 32 | halt |
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| 33 | .long 0x4e7bf000 |
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| 34 | |
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| 35 | unlk %fp |
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| 36 | rts |
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