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-rw-r--r--arch/openrisc/lib/string.S101
1 files changed, 101 insertions, 0 deletions
diff --git a/arch/openrisc/lib/string.S b/arch/openrisc/lib/string.S
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * OpenRISC string.S
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ */
+
+#include <linux/linkage.h>
+#include <asm/errno.h>
+
+ /*
+ * this can be optimized by doing gcc inline assemlby with
+ * proper constraints (no need to save args registers...)
+ *
+ */
+
+
+/*
+ *
+ * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
+ *
+ * NOTE: it returns number of bytes NOT copied !!!
+ *
+ */
+ .global __copy_tofrom_user
+__copy_tofrom_user:
+ l.addi r1,r1,-12
+ l.sw 0(r1),r6
+ l.sw 4(r1),r4
+ l.sw 8(r1),r3
+
+ l.addi r11,r5,0
+2: l.sfeq r11,r0
+ l.bf 1f
+ l.addi r11,r11,-1
+8: l.lbz r6,0(r4)
+9: l.sb 0(r3),r6
+ l.addi r3,r3,1
+ l.j 2b
+ l.addi r4,r4,1
+1:
+ l.addi r11,r11,1 // r11 holds the return value
+
+ l.lwz r6,0(r1)
+ l.lwz r4,4(r1)
+ l.lwz r3,8(r1)
+ l.jr r9
+ l.addi r1,r1,12
+
+ .section .fixup, "ax"
+99:
+ l.j 1b
+ l.nop
+ .previous
+
+ .section __ex_table, "a"
+ .long 8b, 99b // read fault
+ .long 9b, 99b // write fault
+ .previous
+
+/*
+ * unsigned long clear_user(void *addr, unsigned long size) ;
+ *
+ * NOTE: it returns number of bytes NOT cleared !!!
+ */
+ .global __clear_user
+__clear_user:
+ l.addi r1,r1,-8
+ l.sw 0(r1),r4
+ l.sw 4(r1),r3
+
+2: l.sfeq r4,r0
+ l.bf 1f
+ l.addi r4,r4,-1
+9: l.sb 0(r3),r0
+ l.j 2b
+ l.addi r3,r3,1
+
+1:
+ l.addi r11,r4,1
+
+ l.lwz r4,0(r1)
+ l.lwz r3,4(r1)
+ l.jr r9
+ l.addi r1,r1,8
+
+ .section .fixup, "ax"
+99:
+ l.j 1b
+ l.nop
+ .previous
+
+ .section __ex_table, "a"
+ .long 9b, 99b // write fault
+ .previous