Import of Linux/MIPS 2.1.14

1 files changed, 314 insertions, 0 deletions

diff --git a/include/asm-mips/uaccess.h b/include/asm-mips/uaccess.h
new file mode 100644
index 000000000..48a205077
--- /dev/null
+++ b/include/asm-mips/uaccess.h
@@ -0,0 +1,314 @@
+/*
+ * include/asm-mips/uaccess.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996 by Ralf Baechle
+ */
+#ifndef __ASM_MIPS_UACCESS_H
+#define __ASM_MIPS_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <asm/asm.h>
+
+#define STR(x)  __STR(x)
+#define __STR(x)  #x
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not.  If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons, these macros are grossly misnamed.
+ */
+#define KERNEL_DS 0
+#define USER_DS 1
+
+#define VERIFY_READ    0
+#define VERIFY_WRITE   1
+
+#define get_fs()        (current->tss.segment)
+#define set_fs(x)       (current->tss.segment=(x))
+
+static inline unsigned long get_ds(void)
+{
+	return KERNEL_DS;
+}
+
+/*
+ * Is a address valid? This does a straighforward calculation rather
+ * than tests.
+ *
+ * Address valid if:
+ *  - "addr" doesn't have any high-bits set
+ *  - AND "size" doesn't have any high-bits set
+ *  - AND "addr+size" doesn't have any high-bits set
+ *  - OR we are in kernel mode.
+ */
+#define __access_ok(addr,size,mask) \
+	(((__signed__ long)((mask)&(addr | size | (addr+size)))) >= 0)
+#define __access_mask (-(long)get_fs())
+
+#define access_ok(type,addr,size) \
+__access_ok(((unsigned long)(addr)),(size),__access_mask)
+
+extern inline int verify_area(int type, const void * addr, unsigned long size)
+{
+	return access_ok(type,addr,size) ? 0 : -EFAULT;
+}
+
+/*
+ * Uh, these should become the main single-value transfer routines ...
+ * They automatically use the right size if we just have the right
+ * pointer type ...
+ *
+ * As MIPS uses the same address space for kernel and user data, we
+ * can just do these as direct assignments.
+ *
+ * Careful to not
+ * (a) re-use the arguments for side effects (sizeof is ok)
+ * (b) require any knowledge of processes at this stage
+ */
+#define put_user(x,ptr)	__put_user_check((x),(ptr),sizeof(*(ptr)),__access_mask)
+#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)),__access_mask)
+
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the user has to do the
+ * checks by hand with "access_ok()")
+ */
+#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
+#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct *)(x))
+
+#define copy_to_user(to,from,n)   __copy_tofrom_user((to),(from),(n),__cu_to)
+#define copy_from_user(to,from,n) __copy_tofrom_user((to),(from),(n),__cu_from)
+
+extern size_t __copy_user(void *__to, const void *__from, size_t __n);
+
+#define __copy_tofrom_user(to,from,n,v) ({ \
+	void * __cu_to; \
+	const void * __cu_from; \
+	long __cu_len; \
+	\
+	__cu_to = (to); \
+	__cu_from = (from); \
+	__cu_len = (n); \
+	if (__access_ok(((unsigned long)(v)),__cu_len,__access_mask)) \
+		__cu_len = __copy_user(__cu_to, __cu_from, __cu_len); \
+	__cu_len; \
+})
+
+#define __get_user_nocheck(x,ptr,size) ({ \
+long __gu_err; \
+long __gu_val; \
+long __gu_addr; \
+__asm__("":"=r" (__gu_val)); \
+__gu_addr = (long) (ptr); \
+__gu_err = 0; \
+switch (size) { \
+case 1: __get_user_nocheck_asm("lb"); break; \
+case 2: __get_user_nocheck_asm("lh"); break; \
+case 4: __get_user_nocheck_asm("lw"); break; \
+case 8: __get_user_nocheck_asm("ld"); break; \
+default: __get_user_unknown(); break; \
+} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_nocheck_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\t" insn "\t%1,%3\n" \
+	"2:\n\t" \
+	".section\t.fixup,\"ax\"\n" \
+	"3:\t.set\tnoat\n\t" \
+	"la\t$1,2b\n\t" \
+	"li\t%0,%4\n\t" \
+	"jr\t$1\n\t" \
+	".set\tat\n\t" \
+	".section\t__ex_table,\"a\"\n\t" \
+	STR(PTR)"\t1b,3b\n\t" \
+	".text" \
+	:"=r" (__gu_err), "=r" (__gu_val) \
+	:"0" (__gu_err), "o" (__m(__gu_addr)), "i" (-EFAULT) \
+	:"$1"); })
+
+#define __get_user_check(x,ptr,size,mask) ({ \
+long __gu_err; \
+long __gu_val; \
+long __gu_addr; \
+__asm__("":"=r" (__gu_val)); \
+__gu_addr = (long) (ptr); \
+__gu_err = -EFAULT; \
+if (__access_ok(__gu_addr,size,mask)) { \
+switch (size) { \
+case 1: __get_user_check_asm("lb"); break; \
+case 2: __get_user_check_asm("lh"); break; \
+case 4: __get_user_check_asm("lw"); break; \
+case 8: __get_user_check_asm("ld"); break; \
+default: __get_user_unknown(); break; \
+} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_check_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\t" insn "\t%1,%2\n\t" \
+	"move\t%0,$0\n" \
+	"2:\n\t" \
+	".section\t.fixup,\"ax\"\n" \
+	"3:\t.set\tnoat\n\t" \
+	"la\t$1,2b\n\t" \
+	"jr\t$1\n\t" \
+	".set\tat\n\t" \
+	".section\t__ex_table,\"a\"\n\t" \
+	STR(PTR)"\t1b,3b\n\t" \
+	".text" \
+	:"=r" (__gu_err), "=r" (__gu_val) \
+	:"o" (__m(__gu_addr)) \
+	:"$1"); })
+
+extern void __get_user_unknown(void);
+
+#define __put_user_nocheck(x,ptr,size) ({ \
+long __pu_err; \
+__typeof__(*(ptr)) __pu_val; \
+long __pu_addr; \
+__pu_val = (x); \
+__pu_addr = (long) (ptr); \
+__pu_err = 0; \
+switch (size) { \
+case 1: __put_user_nocheck_asm("sb"); break; \
+case 2: __put_user_nocheck_asm("sh"); break; \
+case 4: __put_user_nocheck_asm("sw"); break; \
+case 8: __put_user_nocheck_asm("sd"); break; \
+default: __put_user_unknown(); break; \
+} __pu_err; })
+
+#define __put_user_nocheck_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\t" insn "\t%1,%2\n" \
+	"2:\n\t" \
+	".section\t.fixup,\"ax\"\n" \
+	"3:\t.set\tnoat\n\t" \
+	"la\t$1,2b\n\t" \
+	"li\t%0,%3\n\t" \
+	"jr\t$1\n\t" \
+	".set\tat\n\t" \
+	".section\t__ex_table,\"a\"\n\t" \
+	STR(PTR)"\t1b,3b\n\t" \
+	".text" \
+	:"=r" (__pu_err) \
+	:"r" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT) \
+	:"$1"); })
+
+#define __put_user_check(x,ptr,size,mask) ({ \
+long __pu_err; \
+__typeof__(*(ptr)) __pu_val; \
+long __pu_addr; \
+__pu_val = (x); \
+__pu_addr = (long) (ptr); \
+__pu_err = -EFAULT; \
+if (__access_ok(__pu_addr,size,mask)) { \
+switch (size) { \
+case 1: __put_user_check_asm("sb"); break; \
+case 2: __put_user_check_asm("sh"); break; \
+case 4: __put_user_check_asm("sw"); break; \
+case 8: __put_user_check_asm("sd"); break; \
+default: __put_user_unknown(); break; \
+} } __pu_err; })
+
+#define __put_user_check_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\t" insn "\t%1,%2\n\t" \
+	"move\t%0,$0\n" \
+	"2:\n\t" \
+	".section\t.fixup,\"ax\"\n" \
+	"3:\t.set\tnoat\n\t" \
+	"la\t$1,2b\n\t" \
+	"jr\t$1\n\t" \
+	".set\tat\n\t" \
+	".section\t__ex_table,\"a\"\n\t" \
+	STR(PTR)"\t1b,3b\n\t" \
+	".text" \
+	:"=r" (__pu_err) \
+	:"r" (__pu_val), "o" (__m(__pu_addr)) \
+	:"$1"); })
+
+extern void __put_user_unknown(void);
+
+#define __clear_user(addr,size) \
+({ \
+	void *__cu_end; \
+	__asm__ __volatile__( \
+		".set\tnoreorder\n\t" \
+		"1:\tsb\t$0,(%0)\n\t" \
+		"bne\t%0,%1,1b\n\t" \
+		"addiu\t%0,1\n" \
+		"2:\t.set\treorder\n\t" \
+		".section\t.fixup,\"ax\"\n" \
+		"3:\t.set\tnoat\n\t" \
+		"la\t$1,2b\n\t" \
+		"jr\t$1\n\t" \
+		".set\tat\n\t" \
+		".section\t__ex_table,\"a\"\n\t" \
+		STR(PTR)"\t1b,3b\n\t" \
+		".text" \
+		:"=r" (addr), "=r" (__cu_end) \
+		:"0" (addr), "1" (addr + size - 1), "i" (-EFAULT) \
+		:"$1","memory"); \
+		size = __cu_end - (addr) - 1; \
+})
+
+#define clear_user(addr,n) ({ \
+void * __cl_addr = (addr); \
+unsigned long __cl_size = (n); \
+if (__cl_size && __access_ok(VERIFY_WRITE, ((unsigned long)(__cl_addr)), __cl_size)) \
+__clear_user(__cl_addr, __cl_size); \
+__cl_size; })
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire
+ * buffer filled, else strlen.
+ */
+extern long __strncpy_from_user(char *__to, const char *__from, long __to_len);
+
+#define strncpy_from_user(dest,src,count) ({                            \
+	const void * __sc_src = (src);                                  \
+	long __sc_res = -EFAULT;                                        \
+	if (access_ok(VERIFY_READ, __sc_src, 0)) {                      \
+		__sc_res = __strncpy_from_user(dest, __sc_src, count);  \
+} __sc_res; })
+
+/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
+extern long __strlen_user(const char *);
+
+extern inline long strlen_user(const char *str)
+{
+	long len = __strlen_user(str);
+	if (!access_ok(VERIFY_READ, str, len))
+		len = 0;
+	return len;
+}
+
+struct exception_table_entry
+{
+	unsigned long insn;
+	unsigned long nextinsn;
+};
+
+/* Returns 0 if exception not found and fixup.unit otherwise.  */
+extern unsigned long search_exception_table(unsigned long addr);
+
+/* Returns the new pc */
+#define fixup_exception(map_reg, fixup_unit, pc)                \
+({                                                              \
+	fixup_unit;                                             \
+})
+
+#endif /* __ASM_MIPS_UACCESS_H */