forked from Qortal/Brooklyn
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46 lines
751 B
46 lines
751 B
/* SPDX-License-Identifier: GPL-2.0-only */ |
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#include <linux/linkage.h> |
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#include <asm/export.h> |
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.text |
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/* |
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* Inputs: |
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* %esi : memory location to compare |
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* %eax : low 32 bits of old value |
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* %edx : high 32 bits of old value |
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* %ebx : low 32 bits of new value |
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* %ecx : high 32 bits of new value |
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*/ |
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SYM_FUNC_START(cmpxchg8b_emu) |
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# |
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# Emulate 'cmpxchg8b (%esi)' on UP except we don't |
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# set the whole ZF thing (caller will just compare |
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# eax:edx with the expected value) |
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# |
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pushfl |
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cli |
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cmpl (%esi), %eax |
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jne .Lnot_same |
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cmpl 4(%esi), %edx |
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jne .Lhalf_same |
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movl %ebx, (%esi) |
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movl %ecx, 4(%esi) |
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popfl |
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ret |
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.Lnot_same: |
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movl (%esi), %eax |
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.Lhalf_same: |
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movl 4(%esi), %edx |
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popfl |
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ret |
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SYM_FUNC_END(cmpxchg8b_emu) |
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EXPORT_SYMBOL(cmpxchg8b_emu)
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