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Linux/arch/x86/lib/cmpxchg8b_emu.S

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 
  3 #include <linux/export.h>
  4 #include <linux/linkage.h>
  5 #include <asm/percpu.h>
  6 #include <asm/processor-flags.h>
  7 
  8 .text
  9 
 10 #ifndef CONFIG_X86_CMPXCHG64
 11 
 12 /*
 13  * Emulate 'cmpxchg8b (%esi)' on UP
 14  *
 15  * Inputs:
 16  * %esi : memory location to compare
 17  * %eax : low 32 bits of old value
 18  * %edx : high 32 bits of old value
 19  * %ebx : low 32 bits of new value
 20  * %ecx : high 32 bits of new value
 21  */
 22 SYM_FUNC_START(cmpxchg8b_emu)
 23 
 24         pushfl
 25         cli
 26 
 27         cmpl    (%esi), %eax
 28         jne     .Lnot_same
 29         cmpl    4(%esi), %edx
 30         jne     .Lnot_same
 31 
 32         movl    %ebx, (%esi)
 33         movl    %ecx, 4(%esi)
 34 
 35         orl     $X86_EFLAGS_ZF, (%esp)
 36 
 37         popfl
 38         RET
 39 
 40 .Lnot_same:
 41         movl    (%esi), %eax
 42         movl    4(%esi), %edx
 43 
 44         andl    $(~X86_EFLAGS_ZF), (%esp)
 45 
 46         popfl
 47         RET
 48 
 49 SYM_FUNC_END(cmpxchg8b_emu)
 50 EXPORT_SYMBOL(cmpxchg8b_emu)
 51 
 52 #endif
 53 
 54 #ifndef CONFIG_UML
 55 
 56 /*
 57  * Emulate 'cmpxchg8b %fs:(%rsi)'
 58  *
 59  * Inputs:
 60  * %esi : memory location to compare
 61  * %eax : low 32 bits of old value
 62  * %edx : high 32 bits of old value
 63  * %ebx : low 32 bits of new value
 64  * %ecx : high 32 bits of new value
 65  *
 66  * Notably this is not LOCK prefixed and is not safe against NMIs
 67  */
 68 SYM_FUNC_START(this_cpu_cmpxchg8b_emu)
 69 
 70         pushfl
 71         cli
 72 
 73         cmpl    __percpu (%esi), %eax
 74         jne     .Lnot_same2
 75         cmpl    __percpu 4(%esi), %edx
 76         jne     .Lnot_same2
 77 
 78         movl    %ebx, __percpu (%esi)
 79         movl    %ecx, __percpu 4(%esi)
 80 
 81         orl     $X86_EFLAGS_ZF, (%esp)
 82 
 83         popfl
 84         RET
 85 
 86 .Lnot_same2:
 87         movl    __percpu (%esi), %eax
 88         movl    __percpu 4(%esi), %edx
 89 
 90         andl    $(~X86_EFLAGS_ZF), (%esp)
 91 
 92         popfl
 93         RET
 94 
 95 SYM_FUNC_END(this_cpu_cmpxchg8b_emu)
 96 
 97 #endif

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