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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/csky/lib/usercopy.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--arch/csky/lib/usercopy.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/arch/csky/lib/usercopy.c b/arch/csky/lib/usercopy.c
new file mode 100644
index 000000000..3c01c5442
--- /dev/null
+++ b/arch/csky/lib/usercopy.c
@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/uaccess.h>
+#include <linux/types.h>
+
+unsigned long raw_copy_from_user(void *to, const void *from,
+ unsigned long n)
+{
+ int tmp, nsave;
+
+ __asm__ __volatile__(
+ "0: cmpnei %1, 0 \n"
+ " bf 7f \n"
+ " mov %3, %1 \n"
+ " or %3, %2 \n"
+ " andi %3, 3 \n"
+ " cmpnei %3, 0 \n"
+ " bf 1f \n"
+ " br 5f \n"
+ "1: cmplti %0, 16 \n"
+ " bt 3f \n"
+ "2: ldw %3, (%2, 0) \n"
+ "10: ldw %4, (%2, 4) \n"
+ " stw %3, (%1, 0) \n"
+ " stw %4, (%1, 4) \n"
+ "11: ldw %3, (%2, 8) \n"
+ "12: ldw %4, (%2, 12) \n"
+ " stw %3, (%1, 8) \n"
+ " stw %4, (%1, 12) \n"
+ " addi %2, 16 \n"
+ " addi %1, 16 \n"
+ " subi %0, 16 \n"
+ " br 1b \n"
+ "3: cmplti %0, 4 \n"
+ " bt 5f \n"
+ "4: ldw %3, (%2, 0) \n"
+ " stw %3, (%1, 0) \n"
+ " addi %2, 4 \n"
+ " addi %1, 4 \n"
+ " subi %0, 4 \n"
+ " br 3b \n"
+ "5: cmpnei %0, 0 \n"
+ " bf 7f \n"
+ "6: ldb %3, (%2, 0) \n"
+ " stb %3, (%1, 0) \n"
+ " addi %2, 1 \n"
+ " addi %1, 1 \n"
+ " subi %0, 1 \n"
+ " br 5b \n"
+ "8: stw %3, (%1, 0) \n"
+ " subi %0, 4 \n"
+ " bf 7f \n"
+ "9: subi %0, 8 \n"
+ " bf 7f \n"
+ "13: stw %3, (%1, 8) \n"
+ " subi %0, 12 \n"
+ " bf 7f \n"
+ ".section __ex_table, \"a\" \n"
+ ".align 2 \n"
+ ".long 2b, 7f \n"
+ ".long 4b, 7f \n"
+ ".long 6b, 7f \n"
+ ".long 10b, 8b \n"
+ ".long 11b, 9b \n"
+ ".long 12b,13b \n"
+ ".previous \n"
+ "7: \n"
+ : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave),
+ "=r"(tmp)
+ : "0"(n), "1"(to), "2"(from)
+ : "memory");
+
+ return n;
+}
+EXPORT_SYMBOL(raw_copy_from_user);
+
+unsigned long raw_copy_to_user(void *to, const void *from,
+ unsigned long n)
+{
+ int w0, w1, w2, w3;
+
+ __asm__ __volatile__(
+ "0: cmpnei %1, 0 \n"
+ " bf 8f \n"
+ " mov %3, %1 \n"
+ " or %3, %2 \n"
+ " andi %3, 3 \n"
+ " cmpnei %3, 0 \n"
+ " bf 1f \n"
+ " br 5f \n"
+ "1: cmplti %0, 16 \n" /* 4W */
+ " bt 3f \n"
+ " ldw %3, (%2, 0) \n"
+ " ldw %4, (%2, 4) \n"
+ " ldw %5, (%2, 8) \n"
+ " ldw %6, (%2, 12) \n"
+ "2: stw %3, (%1, 0) \n"
+ "9: stw %4, (%1, 4) \n"
+ "10: stw %5, (%1, 8) \n"
+ "11: stw %6, (%1, 12) \n"
+ " addi %2, 16 \n"
+ " addi %1, 16 \n"
+ " subi %0, 16 \n"
+ " br 1b \n"
+ "3: cmplti %0, 4 \n" /* 1W */
+ " bt 5f \n"
+ " ldw %3, (%2, 0) \n"
+ "4: stw %3, (%1, 0) \n"
+ " addi %2, 4 \n"
+ " addi %1, 4 \n"
+ " subi %0, 4 \n"
+ " br 3b \n"
+ "5: cmpnei %0, 0 \n" /* 1B */
+ " bf 13f \n"
+ " ldb %3, (%2, 0) \n"
+ "6: stb %3, (%1, 0) \n"
+ " addi %2, 1 \n"
+ " addi %1, 1 \n"
+ " subi %0, 1 \n"
+ " br 5b \n"
+ "7: subi %0, 4 \n"
+ "8: subi %0, 4 \n"
+ "12: subi %0, 4 \n"
+ " br 13f \n"
+ ".section __ex_table, \"a\" \n"
+ ".align 2 \n"
+ ".long 2b, 13f \n"
+ ".long 4b, 13f \n"
+ ".long 6b, 13f \n"
+ ".long 9b, 12b \n"
+ ".long 10b, 8b \n"
+ ".long 11b, 7b \n"
+ ".previous \n"
+ "13: \n"
+ : "=r"(n), "=r"(to), "=r"(from), "=r"(w0),
+ "=r"(w1), "=r"(w2), "=r"(w3)
+ : "0"(n), "1"(to), "2"(from)
+ : "memory");
+
+ return n;
+}
+EXPORT_SYMBOL(raw_copy_to_user);
+
+/*
+ * __clear_user: - Zero a block of memory in user space, with less checking.
+ * @to: Destination address, in user space.
+ * @n: Number of bytes to zero.
+ *
+ * Zero a block of memory in user space. Caller must check
+ * the specified block with access_ok() before calling this function.
+ *
+ * Returns number of bytes that could not be cleared.
+ * On success, this will be zero.
+ */
+unsigned long
+__clear_user(void __user *to, unsigned long n)
+{
+ int data, value, tmp;
+
+ __asm__ __volatile__(
+ "0: cmpnei %1, 0 \n"
+ " bf 7f \n"
+ " mov %3, %1 \n"
+ " andi %3, 3 \n"
+ " cmpnei %3, 0 \n"
+ " bf 1f \n"
+ " br 5f \n"
+ "1: cmplti %0, 32 \n" /* 4W */
+ " bt 3f \n"
+ "8: stw %2, (%1, 0) \n"
+ "10: stw %2, (%1, 4) \n"
+ "11: stw %2, (%1, 8) \n"
+ "12: stw %2, (%1, 12) \n"
+ "13: stw %2, (%1, 16) \n"
+ "14: stw %2, (%1, 20) \n"
+ "15: stw %2, (%1, 24) \n"
+ "16: stw %2, (%1, 28) \n"
+ " addi %1, 32 \n"
+ " subi %0, 32 \n"
+ " br 1b \n"
+ "3: cmplti %0, 4 \n" /* 1W */
+ " bt 5f \n"
+ "4: stw %2, (%1, 0) \n"
+ " addi %1, 4 \n"
+ " subi %0, 4 \n"
+ " br 3b \n"
+ "5: cmpnei %0, 0 \n" /* 1B */
+ "9: bf 7f \n"
+ "6: stb %2, (%1, 0) \n"
+ " addi %1, 1 \n"
+ " subi %0, 1 \n"
+ " br 5b \n"
+ ".section __ex_table,\"a\" \n"
+ ".align 2 \n"
+ ".long 8b, 9b \n"
+ ".long 10b, 9b \n"
+ ".long 11b, 9b \n"
+ ".long 12b, 9b \n"
+ ".long 13b, 9b \n"
+ ".long 14b, 9b \n"
+ ".long 15b, 9b \n"
+ ".long 16b, 9b \n"
+ ".long 4b, 9b \n"
+ ".long 6b, 9b \n"
+ ".previous \n"
+ "7: \n"
+ : "=r"(n), "=r" (data), "=r"(value), "=r"(tmp)
+ : "0"(n), "1"(to), "2"(0)
+ : "memory");
+
+ return n;
+}
+EXPORT_SYMBOL(__clear_user);