/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
+
+#define __APPLE_API_PRIVATE
+#include <machine/cpu_capabilities.h>
+#undef __APPLE_API_PRIVATE
+
+// Bzero has migrated to the comm page.
+
+ .text
+ .globl _bzero
+ .globl _memset
+
+ .align 5
+_bzero: // void bzero(void *b, size_t len);
+ ba _COMM_PAGE_BZERO
+
+ .align 5
+_memset: // void * memset(void *b, int c, size_t len);
+ andi. r9,r4,0xFF // copy "c" and test for 0
+ mr r4,r5 // move length down to where bzero() expects it
+ beqa++ _COMM_PAGE_BZERO // c==0, so treat like bzero()
+
+// The nonzero memset() case is uncommon.
+
+ cmplwi r5,8 // too short to align?
+ rlwimi r9,r9,8,16,23 // replicate c to all 4 bytes
+ neg r7,r3 // start to compute #bytes to word align
+ mr r8,r3 // copy ptr so we can preserve r3
+ rlwimi r9,r9,16,0,15
+ blt 4f // fewer than 8 bytes
+ andi. r0,r7,3 // get #bytes to word align
+ mtcrf 0x01,r7 // set up #bytes to word align
+ sub r5,r5,r0 // adjust length for word alignment
+ srwi r6,r5,3 // get #8-byte chunks to memset()
+ cmplwi cr1,r6,0 // any chunks?
+ mtctr r6
+ beq 3f // already word aligned (r6!=0)
+
+ bf 31,1f // odd byte?
+ stb r9,0(r8)
+ addi r8,r8,1
+1:
+ bf 30,2f // halfword?
+ sth r9,0(r8)
+ addi r8,r8,2
+2:
+ bne cr1,3f // handle 8-byte chunks
+ b 4f // no chunks
+
+ .align 5
+3:
+ stw r9,0(r8)
+ stw r9,4(r8)
+ addi r8,r8,8
+ bdnz 3b
+
+// Store up to 8 leftover bytes.
+// r9 = value in all 4 bytes
+// r8 = ptr
+// r5 = length
+
+4:
+ mtcrf 0x01,r5 // move remaining length to cr7
+ bf 29,6f
+ stw r9,0(r8)
+ addi r8,r8,4
+6:
+ bf 30,7f
+ sth r9,0(r8)
+ addi r8,r8,2
+7:
+ bflr 31
+ stb r9,0(r8)
+ blr
+
+
+#if 0
//
// =============================
// BZERO and MEMSET FOR Mac OS X
bflr 31
stb rv,0(rp)
blr
+#endif /* 0 */
\ No newline at end of file
projects / apple / libc.git / blobdiff