patch-2.3.43 linux/arch/ia64/lib/strncpy_from_user.S

• Lines: 54
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/arch/ia64/lib/strncpy_from_user.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/arch/ia64/lib/strncpy_from_user.S linux/arch/ia64/lib/strncpy_from_user.S
@@ -0,0 +1,53 @@
+/*
+ * Just like strncpy() except for the return value.  If no fault occurs during
+ * the copying, the number of bytes copied is returned.  If a fault occurs,
+ * -EFAULT is returned.
+ *
+ * Inputs:
+ *	in0:	address of destination buffer
+ *	in1:	address of string to be copied
+ *	in2:	length of buffer in bytes
+ * Outputs:
+ *	r8:	-EFAULT in case of fault or number of bytes copied if no fault
+ * 
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#define EX(x...)				\
+99:	x;					\
+	.section __ex_table,"a";		\
+	data4 @gprel(99b);			\
+	data4 .Lexit-99b;			\
+	.previous
+
+	.text
+	.psr abi64
+	.psr lsb
+	.lsb
+
+	.align 32
+	.global __strncpy_from_user
+	.proc __strncpy_from_user
+__strncpy_from_user:
+	alloc r11=ar.pfs,3,0,0,0
+	mov r9=in1
+	add r10=in1,in2
+
+	// XXX braindead copy loop---this needs to be optimized
+.Loop1:
+	EX(ld1 r8=[in1],1)
+	;;
+	st1 [in0]=r8,1
+	cmp.ltu p6,p0=in1,r10
+	;;
+(p6)	cmp.ne.and p6,p0=r8,r0
+	;;
+(p6)	br.cond.dpnt.few .Loop1
+
+1:	sub r8=in1,r9		// length of string (including NUL character)
+.Lexit:
+	mov ar.pfs=r11
+	br.ret.sptk.few rp
+
+	.endp __strncpy_from_user