patch-2.1.4 linux/arch/alpha/lib/put_user.S

• Lines: 131
• Date: Mon Oct 14 17:02:45 1996
• Orig file: v2.1.3/linux/arch/alpha/lib/put_user.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.3/linux/arch/alpha/lib/put_user.S linux/arch/alpha/lib/put_user.S
@@ -0,0 +1,130 @@
+/*
+ * arch/alpha/lib/put_user.S
+ *
+ * (C) Copyright 1996 Linus Torvalds
+ */
+
+/*
+ * This does simple writes to user mode, returning zero for
+ * success and -EINVAL for a fault. Note that we may NOT do
+ * unaligned accesses, because the unaligned fault handler
+ * must not take the exception..
+ *
+ * NOTE! These are NOT normal function calls callable from C.
+ * As we have two return values (the actual value gotten from
+ * user space, and the error return value) the calling sequence
+ * is different.
+ *
+ * Input:
+ *	value to be written in $6
+ *	user address in $7
+ *	exception pointer in $8
+ *	return address in $28 (exceptions expect it there)
+ * Output:
+ *	return value in $0
+ * Clobbers:
+ *	$1,$2,$3,$4,$5,$6
+ */
+	.set noat
+	.align 3
+	.globl __put_user_8
+	.ent __put_user_8
+__put_user_8:
+	ldq $2,0($8)
+	lda $0,-14
+	addq $2,1,$1
+	stq $1,0($8)
+	ldq_u $1,0($7)
+	insbl $6,$7,$6
+	mskbl $1,$7,$1
+	bis $6,$1,$6
+	stq_u $6,0($7)
+	stq $2,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.end __put_user_8
+
+	.align 3
+	.globl __put_user_16
+	.ent __put_user_16
+__put_user_16:
+	ldq $2,0($8)
+	lda $0,-14
+	addq $2,1,$1
+	stq $1,0($8)
+	ldq_u $4,1($7)
+	ldq_u $5,0($7)
+	inswh $6,$7,$1
+	inswl $6,$7,$3
+	mskwh $4,$7,$4
+	mskwl $5,$7,$5
+	bis $4,$1,$4
+	bis $5,$3,$5
+	stq_u $4,1($7)
+	stq_u $5,0($7)
+	stq $2,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.end __put_user_16
+
+	.align 3
+	.globl __put_user_32
+	.ent __put_user_32
+__put_user_32:
+	ldq $5,0($8)
+	lda $0,-14
+	and $7,3,$2
+	addq $5,1,$1
+	stq $1,0($8)
+	bne $2,__una32
+	stl $6,0($7)
+	stq $5,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.align 4
+__una32:
+	ldq_u $3,3($7)
+	ldq_u $4,0($7)
+	insll $6,$7,$2
+	inslh $6,$7,$1
+	msklh $3,$7,$3
+	mskll $4,$7,$4
+	bis $3,$1,$3
+	bis $4,$2,$4
+	stq_u $3,3($7)
+	stq_u $4,0($7)
+	stq $5,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.end __put_user_32
+
+	.align 3
+	.globl __put_user_64
+	.ent __put_user_64
+__put_user_64:
+	ldq $5,0($8)
+	lda $0,-14
+	and $7,7,$2
+	addq $5,1,$1
+	stq $1,0($8)
+	bne $2,__una64
+	stq $6,0($7)
+	stq $5,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.align 4
+__una64:
+	ldq_u $4,0($7)
+	ldq_u $3,8($7)
+	insql $6,$7,$2
+	insqh $6,$7,$1
+	mskql $4,$7,$4
+	mskqh $3,$7,$3
+	bis $4,$2,$4
+	bis $3,$1,$3
+	stq_u $4,0($7)
+	stq_u $3,8($7)
+	stq $5,0($8)
+	bis $31,$31,$0
+	ret $31,($28),1
+	.end __put_user_64