Changeset 60657 in vbox for trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemChr.asm

Timestamp:

Apr 22, 2016 3:57:22 PM (9 years ago)

Author:

vboxsync

Message:

bs3kit: updates

File:

• trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemChr.asm (copied) (copied from trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm ) (2 diffs)

trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemChr.asm

@@ -1 +1 @@
 ; $Id$
 ;; @file
-; BS3Kit - Bs3MemZero.
+; BS3Kit - Bs3MemChr.
 ;
 
 ;
-; Copyright (C) 2007-2015 Oracle Corporation
+; Copyright (C) 2007-2016 Oracle Corporation
 ;
 ; This file is part of VirtualBox Open Source Edition (OSE), as
@@ -28 +28 @@
 
 ;;
-; @cproto   BS3_DECL(void) Bs3MemZero_c16(void BS3_FAR *pvDst, size_t cbDst);
+; @cproto   BS3_CMN_PROTO_NOSB(void BS3_FAR *, Bs3MemChr,(void BS3_FAR const *pvHaystack, uint8_t bNeedle, size_t cbHaystack));
 ;
-BS3_PROC_BEGIN_CMN Bs3MemZero, BS3_PBC_HYBRID
-%ifdef RT_ARCH_AMD64
-        push    rdi
+BS3_PROC_BEGIN_CMN Bs3MemChr, BS3_PBC_HYBRID
+        push    xBP
+        mov     xBP, xSP
+        push    xDI
+TONLY16 push    es
 
-        mov     rdi, rcx                ; rdi = pvDst
-        mov     rcx, rdx                ; rcx = cbDst
-        shr     rcx, 3                  ; calc qword count.
-        xor     eax, eax                ; rax = 0 (filler qword)
+%if TMPL_BITS == 64
+
+        mov     rdi, rcx                ; rdi = pvHaystack
+        mov     rcx, r8                 ; rcx = cbHaystack
+        mov     al, dl                  ; bNeedle
+        mov     rcx, r8
+
+%elif TMPL_BITS == 16
+        mov     di, [bp + 2 + cbCurRetAddr]     ; pvHaystack.off
+        mov     es, [bp + 2 + cbCurRetAddr + 2] ; pvHaystack.sel
+        mov     al, [bp + 2 + cbCurRetAddr + 4] ; bNeedle
+        mov     cx, [bp + 2 + cbCurRetAddr + 6] ; cbHaystack
+
+%elif TMPL_BITS == 32
+        mov     edi, [ebp + 8]                          ; pvHaystack
+        mov     al, byte [ebp + 4 + cbCurRetAddr + 4]   ; bNeedle
+        mov     ecx, [ebp + 4 + cbCurRetAddr + 8]       ; cbHaystack
+%else
+ %error "TMPL_BITS!"
+%endif
+
         cld
-        rep stosq
+        repne scasb
+        je      .found
 
-        mov     rcx, rdx                ; cbDst
-        and     rcx, 7                  ; calc trailing byte count.
-        rep stosb
+        xor     xAX, xAX
+TONLY16 xor     dx, dx
 
-        pop     rdi
+.return:
+TONLY16 pop     es
+        pop     xDI
+        pop     xBP
         BS3_HYBRID_RET
 
-%elif ARCH_BITS == 16
-        push    bp
-        mov     bp, sp
-        push    di
-        push    es
+.found:
+        lea     xAX, [xDI - 1]
+TONLY16 mov     dx, es
+        jmp     .return
 
-        mov     di, [bp + 2 + cbCurRetAddr]     ; pvDst.off
-        mov     dx, [bp + 2 + cbCurRetAddr + 2] ; pvDst.sel
-        mov     es, dx
-        mov     cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst
-        shr     cx, 1                           ; calc dword count.
-        xor     ax, ax
-        rep stosw
+BS3_PROC_END_CMN   Bs3MemChr
 
-        mov     cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst
-        and     cx, 1                           ; calc tailing byte count.
-        rep stosb
-
-        pop     es
-        pop     di
-        pop     bp
-        BS3_HYBRID_RET
-
-%elif ARCH_BITS == 32
-        push    edi
-
-        mov     edi, [esp + 8]          ; pvDst
-        mov     ecx, [esp + 8 + 4]      ; cbDst
-        shr     cx, 2                   ; calc dword count.
-        xor     eax, eax
-        rep stosd
-
-        mov     ecx, [esp + 8 + 4]      ; cbDst
-        and     ecx, 3                  ; calc tailing byte count.
-        rep stosb
-
-        pop     edi
-        BS3_HYBRID_RET
-
-%else
- %error "Unknown bitness."
-%endif
-BS3_PROC_END_CMN   Bs3MemZero
-