181 lines
2.5 KiB
ArmAsm
181 lines
2.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* atomic64_t for 586+
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*
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* Copyright © 2010 Luca Barbieri
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*/
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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.macro read64 reg
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movl %ebx, %eax
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movl %ecx, %edx
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/* we need LOCK_PREFIX since otherwise cmpxchg8b always does the write */
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LOCK_PREFIX
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cmpxchg8b (\reg)
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.endm
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ENTRY(atomic64_read_cx8)
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read64 %ecx
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ret
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ENDPROC(atomic64_read_cx8)
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ENTRY(atomic64_set_cx8)
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1:
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/* we don't need LOCK_PREFIX since aligned 64-bit writes
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* are atomic on 586 and newer */
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cmpxchg8b (%esi)
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jne 1b
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ret
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ENDPROC(atomic64_set_cx8)
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ENTRY(atomic64_xchg_cx8)
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1:
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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ret
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ENDPROC(atomic64_xchg_cx8)
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.macro addsub_return func ins insc
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ENTRY(atomic64_\func\()_return_cx8)
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movl %eax, %esi
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movl %edx, %edi
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movl %ecx, %ebp
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read64 %ecx
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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\ins\()l %esi, %ebx
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\insc\()l %edi, %ecx
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LOCK_PREFIX
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cmpxchg8b (%ebp)
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jne 1b
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10:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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ENDPROC(atomic64_\func\()_return_cx8)
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.endm
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addsub_return add add adc
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addsub_return sub sub sbb
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.macro incdec_return func ins insc
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ENTRY(atomic64_\func\()_return_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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\ins\()l $1, %ebx
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\insc\()l $0, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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10:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %ebx
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ret
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ENDPROC(atomic64_\func\()_return_cx8)
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.endm
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incdec_return inc add adc
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incdec_return dec sub sbb
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ENTRY(atomic64_dec_if_positive_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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subl $1, %ebx
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sbb $0, %ecx
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js 2f
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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2:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %ebx
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ret
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ENDPROC(atomic64_dec_if_positive_cx8)
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ENTRY(atomic64_add_unless_cx8)
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pushl %ebp
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pushl %ebx
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/* these just push these two parameters on the stack */
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pushl %edi
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pushl %ecx
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movl %eax, %ebp
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movl %edx, %edi
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read64 %esi
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1:
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cmpl %eax, 0(%esp)
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je 4f
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2:
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movl %eax, %ebx
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movl %edx, %ecx
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addl %ebp, %ebx
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adcl %edi, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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movl $1, %eax
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3:
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addl $8, %esp
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popl %ebx
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popl %ebp
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ret
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4:
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cmpl %edx, 4(%esp)
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jne 2b
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xorl %eax, %eax
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jmp 3b
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ENDPROC(atomic64_add_unless_cx8)
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ENTRY(atomic64_inc_not_zero_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ecx
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orl %edx, %ecx
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jz 3f
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movl %eax, %ebx
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xorl %ecx, %ecx
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addl $1, %ebx
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adcl %edx, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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movl $1, %eax
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3:
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popl %ebx
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ret
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ENDPROC(atomic64_inc_not_zero_cx8)
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