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- /*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- *
- */
- #include <linux/linkage.h>
- #include <asm/alternative-asm.h>
- #include <asm/frame.h>
- #include <asm/dwarf2.h>
- .text
- /*
- * Inputs:
- * %esi : memory location to compare
- * %eax : low 32 bits of old value
- * %edx : high 32 bits of old value
- * %ebx : low 32 bits of new value
- * %ecx : high 32 bits of new value
- */
- ENTRY(cmpxchg8b_emu)
- CFI_STARTPROC
- #
- # Emulate 'cmpxchg8b (%esi)' on UP except we don't
- # set the whole ZF thing (caller will just compare
- # eax:edx with the expected value)
- #
- cmpxchg8b_emu:
- pushfl
- cli
- cmpl (%esi), %eax
- jne not_same
- cmpl 4(%esi), %edx
- jne half_same
- movl %ebx, (%esi)
- movl %ecx, 4(%esi)
- popfl
- ret
- not_same:
- movl (%esi), %eax
- half_same:
- movl 4(%esi), %edx
- popfl
- ret
- CFI_ENDPROC
- ENDPROC(cmpxchg8b_emu)
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