Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 222 insertions, 0 deletions

diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
new file mode 100644
index 000000000..416507989
--- /dev/null
+++ b/arch/parisc/include/asm/uaccess.h
@@ -0,0 +1,222 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PARISC_UACCESS_H
+#define __PARISC_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <asm/page.h>
+#include <asm/cache.h>
+
+#include <linux/bug.h>
+#include <linux/string.h>
+
+#define TASK_SIZE_MAX DEFAULT_TASK_SIZE
+#include <asm/pgtable.h>
+#include <asm-generic/access_ok.h>
+
+#define put_user __put_user
+#define get_user __get_user
+
+#if !defined(CONFIG_64BIT)
+#define LDD_USER(sr, val, ptr)	__get_user_asm64(sr, val, ptr)
+#define STD_USER(sr, x, ptr)	__put_user_asm64(sr, x, ptr)
+#else
+#define LDD_USER(sr, val, ptr)	__get_user_asm(sr, val, "ldd", ptr)
+#define STD_USER(sr, x, ptr)	__put_user_asm(sr, "std", x, ptr)
+#endif
+
+/*
+ * The exception table contains two values: the first is the relative offset to
+ * the address of the instruction that is allowed to fault, and the second is
+ * the relative offset to the address of the fixup routine. Since relative
+ * addresses are used, 32bit values are sufficient even on 64bit kernel.
+ */
+
+#define ARCH_HAS_RELATIVE_EXTABLE
+struct exception_table_entry {
+	int insn;	/* relative address of insn that is allowed to fault. */
+	int fixup;	/* relative address of fixup routine */
+};
+
+#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
+	".section __ex_table,\"aw\"\n"			   \
+	".align 4\n"					   \
+	".word (" #fault_addr " - .), (" #except_addr " - .)\n\t" \
+	".previous\n"
+
+/*
+ * ASM_EXCEPTIONTABLE_ENTRY_EFAULT() creates a special exception table entry
+ * (with lowest bit set) for which the fault handler in fixup_exception() will
+ * load -EFAULT into %r29 for a read or write fault, and zeroes the target
+ * register in case of a read fault in get_user().
+ */
+#define ASM_EXCEPTIONTABLE_REG	29
+#define ASM_EXCEPTIONTABLE_VAR(__variable)		\
+	register long __variable __asm__ ("r29") = 0
+#define ASM_EXCEPTIONTABLE_ENTRY_EFAULT( fault_addr, except_addr )\
+	ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr + 1)
+
+#define __get_user_internal(sr, val, ptr)		\
+({							\
+	ASM_EXCEPTIONTABLE_VAR(__gu_err);		\
+							\
+	switch (sizeof(*(ptr))) {			\
+	case 1: __get_user_asm(sr, val, "ldb", ptr); break; \
+	case 2: __get_user_asm(sr, val, "ldh", ptr); break; \
+	case 4: __get_user_asm(sr, val, "ldw", ptr); break; \
+	case 8: LDD_USER(sr, val, ptr); break;		\
+	default: BUILD_BUG();				\
+	}						\
+							\
+	__gu_err;					\
+})
+
+#define __get_user(val, ptr)				\
+({							\
+	__get_user_internal(SR_USER, val, ptr);	\
+})
+
+#define __get_user_asm(sr, val, ldx, ptr)		\
+{							\
+	register long __gu_val;				\
+							\
+	__asm__("1: " ldx " 0(%%sr%2,%3),%0\n"		\
+		"9:\n"					\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b)	\
+		: "=r"(__gu_val), "+r"(__gu_err)        \
+		: "i"(sr), "r"(ptr));			\
+							\
+	(val) = (__force __typeof__(*(ptr))) __gu_val;	\
+}
+
+#define __get_kernel_nofault(dst, src, type, err_label)	\
+{							\
+	type __z;					\
+	long __err;					\
+	__err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
+	if (unlikely(__err))				\
+		goto err_label;				\
+	else						\
+		*(type *)(dst) = __z;			\
+}
+
+
+#if !defined(CONFIG_64BIT)
+
+#define __get_user_asm64(sr, val, ptr)			\
+{							\
+	union {						\
+		unsigned long long	l;		\
+		__typeof__(*(ptr))	t;		\
+	} __gu_tmp;					\
+							\
+	__asm__("   copy %%r0,%R0\n"			\
+		"1: ldw 0(%%sr%2,%3),%0\n"		\
+		"2: ldw 4(%%sr%2,%3),%R0\n"		\
+		"9:\n"					\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b)	\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b)	\
+		: "=&r"(__gu_tmp.l), "+r"(__gu_err)	\
+		: "i"(sr), "r"(ptr));			\
+							\
+	(val) = __gu_tmp.t;				\
+}
+
+#endif /* !defined(CONFIG_64BIT) */
+
+
+#define __put_user_internal(sr, x, ptr)				\
+({								\
+	ASM_EXCEPTIONTABLE_VAR(__pu_err);		      	\
+								\
+	switch (sizeof(*(ptr))) {				\
+	case 1: __put_user_asm(sr, "stb", x, ptr); break;	\
+	case 2: __put_user_asm(sr, "sth", x, ptr); break;	\
+	case 4: __put_user_asm(sr, "stw", x, ptr); break;	\
+	case 8: STD_USER(sr, x, ptr); break;			\
+	default: BUILD_BUG();					\
+	}							\
+								\
+	__pu_err;						\
+})
+
+#define __put_user(x, ptr)					\
+({								\
+	__typeof__(&*(ptr)) __ptr = ptr;			\
+	__typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x);	\
+	__put_user_internal(SR_USER, __x, __ptr);		\
+})
+
+#define __put_kernel_nofault(dst, src, type, err_label)		\
+{								\
+	type __z = *(type *)(src);				\
+	long __err;						\
+	__err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \
+	if (unlikely(__err))					\
+		goto err_label;					\
+}
+
+
+
+
+/*
+ * The "__put_user/kernel_asm()" macros tell gcc they read from memory
+ * instead of writing. This is because they do not write to any memory
+ * gcc knows about, so there are no aliasing issues. These macros must
+ * also be aware that fixups are executed in the context of the fault,
+ * and any registers used there must be listed as clobbers.
+ * The register holding the possible EFAULT error (ASM_EXCEPTIONTABLE_REG)
+ * is already listed as input and output register.
+ */
+
+#define __put_user_asm(sr, stx, x, ptr)				\
+	__asm__ __volatile__ (					\
+		"1: " stx " %1,0(%%sr%2,%3)\n"			\
+		"9:\n"						\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b)		\
+		: "+r"(__pu_err)				\
+		: "r"(x), "i"(sr), "r"(ptr))
+
+
+#if !defined(CONFIG_64BIT)
+
+#define __put_user_asm64(sr, __val, ptr) do {			\
+	__asm__ __volatile__ (					\
+		"1: stw %1,0(%%sr%2,%3)\n"			\
+		"2: stw %R1,4(%%sr%2,%3)\n"			\
+		"9:\n"						\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b)		\
+		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b)		\
+		: "+r"(__pu_err)				\
+		: "r"(__val), "i"(sr), "r"(ptr));		\
+} while (0)
+
+#endif /* !defined(CONFIG_64BIT) */
+
+
+/*
+ * Complex access routines -- external declarations
+ */
+
+extern long strncpy_from_user(char *, const char __user *, long);
+extern __must_check unsigned lclear_user(void __user *, unsigned long);
+extern __must_check long strnlen_user(const char __user *src, long n);
+/*
+ * Complex access routines -- macros
+ */
+
+#define clear_user lclear_user
+#define __clear_user lclear_user
+
+unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src,
+					    unsigned long len);
+unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
+					    unsigned long len);
+#define INLINE_COPY_TO_USER
+#define INLINE_COPY_FROM_USER
+
+struct pt_regs;
+int fixup_exception(struct pt_regs *regs);
+
+#endif /* __PARISC_UACCESS_H */