Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
new file mode 100644
index 000000000..d44214072
--- /dev/null
+++ b/arch/s390/lib/uaccess.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Standard user space access functions based on mvcp/mvcs and doing
+ *  interesting things in the secondary space mode.
+ *
+ *    Copyright IBM Corp. 2006,2014
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *		 Gerald Schaefer (gerald.schaefer@de.ibm.com)
+ */
+
+#include <linux/uaccess.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <asm/asm-extable.h>
+
+#ifdef CONFIG_DEBUG_ENTRY
+void debug_user_asce(int exit)
+{
+	unsigned long cr1, cr7;
+
+	__ctl_store(cr1, 1, 1);
+	__ctl_store(cr7, 7, 7);
+	if (cr1 == S390_lowcore.kernel_asce && cr7 == S390_lowcore.user_asce)
+		return;
+	panic("incorrect ASCE on kernel %s\n"
+	      "cr1:    %016lx cr7:  %016lx\n"
+	      "kernel: %016llx user: %016llx\n",
+	      exit ? "exit" : "entry", cr1, cr7,
+	      S390_lowcore.kernel_asce, S390_lowcore.user_asce);
+
+}
+#endif /*CONFIG_DEBUG_ENTRY */
+
+static unsigned long raw_copy_from_user_key(void *to, const void __user *from,
+					    unsigned long size, unsigned long key)
+{
+	unsigned long tmp1, tmp2;
+	union oac spec = {
+		.oac2.key = key,
+		.oac2.as = PSW_BITS_AS_SECONDARY,
+		.oac2.k = 1,
+		.oac2.a = 1,
+	};
+
+	tmp1 = -4096UL;
+	asm volatile(
+		"   lr	  0,%[spec]\n"
+		"0: mvcos 0(%2),0(%1),%0\n"
+		"6: jz    4f\n"
+		"1: algr  %0,%3\n"
+		"   slgr  %1,%3\n"
+		"   slgr  %2,%3\n"
+		"   j     0b\n"
+		"2: la    %4,4095(%1)\n"/* %4 = ptr + 4095 */
+		"   nr    %4,%3\n"	/* %4 = (ptr + 4095) & -4096 */
+		"   slgr  %4,%1\n"
+		"   clgr  %0,%4\n"	/* copy crosses next page boundary? */
+		"   jnh   5f\n"
+		"3: mvcos 0(%2),0(%1),%4\n"
+		"7: slgr  %0,%4\n"
+		"   j     5f\n"
+		"4: slgr  %0,%0\n"
+		"5:\n"
+		EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b)
+		: "+a" (size), "+a" (from), "+a" (to), "+a" (tmp1), "=a" (tmp2)
+		: [spec] "d" (spec.val)
+		: "cc", "memory", "0");
+	return size;
+}
+
+unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	return raw_copy_from_user_key(to, from, n, 0);
+}
+EXPORT_SYMBOL(raw_copy_from_user);
+
+unsigned long _copy_from_user_key(void *to, const void __user *from,
+				  unsigned long n, unsigned long key)
+{
+	unsigned long res = n;
+
+	might_fault();
+	if (!should_fail_usercopy()) {
+		instrument_copy_from_user_before(to, from, n);
+		res = raw_copy_from_user_key(to, from, n, key);
+		instrument_copy_from_user_after(to, from, n, res);
+	}
+	if (unlikely(res))
+		memset(to + (n - res), 0, res);
+	return res;
+}
+EXPORT_SYMBOL(_copy_from_user_key);
+
+static unsigned long raw_copy_to_user_key(void __user *to, const void *from,
+					  unsigned long size, unsigned long key)
+{
+	unsigned long tmp1, tmp2;
+	union oac spec = {
+		.oac1.key = key,
+		.oac1.as = PSW_BITS_AS_SECONDARY,
+		.oac1.k = 1,
+		.oac1.a = 1,
+	};
+
+	tmp1 = -4096UL;
+	asm volatile(
+		"   lr	  0,%[spec]\n"
+		"0: mvcos 0(%1),0(%2),%0\n"
+		"6: jz    4f\n"
+		"1: algr  %0,%3\n"
+		"   slgr  %1,%3\n"
+		"   slgr  %2,%3\n"
+		"   j     0b\n"
+		"2: la    %4,4095(%1)\n"/* %4 = ptr + 4095 */
+		"   nr    %4,%3\n"	/* %4 = (ptr + 4095) & -4096 */
+		"   slgr  %4,%1\n"
+		"   clgr  %0,%4\n"	/* copy crosses next page boundary? */
+		"   jnh   5f\n"
+		"3: mvcos 0(%1),0(%2),%4\n"
+		"7: slgr  %0,%4\n"
+		"   j     5f\n"
+		"4: slgr  %0,%0\n"
+		"5:\n"
+		EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b)
+		: "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2)
+		: [spec] "d" (spec.val)
+		: "cc", "memory", "0");
+	return size;
+}
+
+unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return raw_copy_to_user_key(to, from, n, 0);
+}
+EXPORT_SYMBOL(raw_copy_to_user);
+
+unsigned long _copy_to_user_key(void __user *to, const void *from,
+				unsigned long n, unsigned long key)
+{
+	might_fault();
+	if (should_fail_usercopy())
+		return n;
+	instrument_copy_to_user(to, from, n);
+	return raw_copy_to_user_key(to, from, n, key);
+}
+EXPORT_SYMBOL(_copy_to_user_key);
+
+unsigned long __clear_user(void __user *to, unsigned long size)
+{
+	unsigned long tmp1, tmp2;
+	union oac spec = {
+		.oac1.as = PSW_BITS_AS_SECONDARY,
+		.oac1.a = 1,
+	};
+
+	tmp1 = -4096UL;
+	asm volatile(
+		"   lr	  0,%[spec]\n"
+		"0: mvcos 0(%1),0(%4),%0\n"
+		"6: jz	  4f\n"
+		"1: algr  %0,%2\n"
+		"   slgr  %1,%2\n"
+		"   j	  0b\n"
+		"2: la	  %3,4095(%1)\n"/* %4 = to + 4095 */
+		"   nr	  %3,%2\n"	/* %4 = (to + 4095) & -4096 */
+		"   slgr  %3,%1\n"
+		"   clgr  %0,%3\n"	/* copy crosses next page boundary? */
+		"   jnh	  5f\n"
+		"3: mvcos 0(%1),0(%4),%3\n"
+		"7: slgr  %0,%3\n"
+		"   j	  5f\n"
+		"4: slgr  %0,%0\n"
+		"5:\n"
+		EX_TABLE(0b,2b) EX_TABLE(6b,2b) EX_TABLE(3b,5b) EX_TABLE(7b,5b)
+		: "+&a" (size), "+&a" (to), "+a" (tmp1), "=&a" (tmp2)
+		: "a" (empty_zero_page), [spec] "d" (spec.val)
+		: "cc", "memory", "0");
+	return size;
+}
+EXPORT_SYMBOL(__clear_user);