42 lines
911 B
ArmAsm
42 lines
911 B
ArmAsm
/*
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* Copyright (C) 2009 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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.text
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.global _cortex_hang_start, _cortex_hang_ffe, _cortex_hang_end
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.thumb
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.syntax unified
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// Believe it or not, without this, it does not fail
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#define NOP mov r8,r8
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// R0 holds the number of iterations we should run
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// start this routine at a page boundary
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_cortex_hang_start:
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// save some registers and set aside a word
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push {r4,r5,r6,r7,lr}
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sub sp, #4
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1:
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cmp r0, #0
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beq 1f
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NOP // 0xff0
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NOP // 0xff2
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NOP // 0xff4
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NOP // 0xff6
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subs r0, #1 // 0xff8
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str.w ip, [sp] // 0xffa
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_cortex_hang_ffe:
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bl 1b // 0xffe
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1:
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add sp, #4
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pop {r4,r5,r6,r7,pc}
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bx lr
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_cortex_hang_end:
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