Changeset 25490 in vbox for trunk/src/VBox/Runtime/common/asm

Timestamp:

Dec 18, 2009 3:19:41 PM (15 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

56161

Message:

iprt/asm.h: Adding ASMAtomicCmpXchgU8, ASMAtomicCmpXchgS8 and ASMAtomicCmpXchgBool.

File:

• trunk/src/VBox/Runtime/common/asm/ASMAtomicCmpXchgU8.asm (copied) (copied from trunk/src/VBox/Runtime/common/asm/ASMAtomicCmpXchgU64.asm ) (2 diffs)

trunk/src/VBox/Runtime/common/asm/ASMAtomicCmpXchgU8.asm

@@ -1 +1 @@
 ; $Id$
 ;; @file
-; IPRT - ASMAtomicCmpXchgU64().
+; IPRT - ASMAtomicCmpXchgU8().
 ;
 
@@ -37 +37 @@
 
 ;;
-; Atomically compares and exchanges an unsigned 64-bit int.
+; Atomically compares and exchanges an unsigned 8-bit int.
 ;
-; @param    pu64     x86:ebp+8
-; @param    u64New   x86:ebp+c
-; @param    u64Old   x86:ebp+14
+; @param    pu8     x86:esp+4  msc:rcx  gcc:rdi
+; @param    u8New   x86:esp+8  msc:dl   gcc:sil
+; @param    u8Old   x86:esp+c  msc:r8l  gcc:dl
 ;
 ; @returns  bool result: true if succesfully exchanged, false if not.
 ;           x86:al
 ;
-BEGINPROC_EXPORTED ASMAtomicCmpXchgU64
-%ifndef RT_ARCH_X86
- %error port me
+BEGINPROC_EXPORTED ASMAtomicCmpXchgU8
+%ifdef RT_ARCH_AMD64
+ %ifdef ASM_CALL64_MSC
+        mov     al, r8l
+        lock cmpxchg [rcx], dl
+ %else
+        mov     al, dl
+        lock cmpxchg [rdi], sil
+ %endif
+%else
+        mov     ecx, [esp + 04h]
+        mov     dl,  [esp + 08h]
+        mov     al,  [esp + 0ch]
+        lock cmpxchg [ecx], dl
 %endif
-        push    ebp
-        mov     ebp, esp
-        push    ebx
-        push    edi
-
-        mov     ebx, dword [ebp+0ch]
-        mov     ecx, dword [ebp+0ch + 4]
-        mov     edi, [ebp+08h]
-        mov     eax, dword [ebp+14h]
-        mov     edx, dword [ebp+14h + 4]
-        lock cmpxchg8b [edi]
         setz    al
         movzx   eax, al
+        ret
+ENDPROC ASMAtomicCmpXchgU8
 
-        pop     edi
-        pop     ebx
-        leave
-        ret
-ENDPROC ASMAtomicCmpXchgU64
-