[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6

The attached patches provides part 6 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 532 insertions, 0 deletions

diff --git a/include/asm-xtensa/uaccess.h b/include/asm-xtensa/uaccess.h
new file mode 100644
index 000000000000..35576b25c7b2
--- /dev/null
+++ b/include/asm-xtensa/uaccess.h
@@ -0,0 +1,532 @@
+/*
+ * include/asm-xtensa/uaccess.h
+ *
+ * User space memory access functions
+ *
+ * These routines provide basic accessing functions to the user memory
+ * space for the kernel. This header file provides fuctions such as:
+ *
+ * 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) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_UACCESS_H
+#define _XTENSA_UACCESS_H
+
+#include <linux/errno.h>
+
+#define VERIFY_READ    0
+#define VERIFY_WRITE   1
+
+#ifdef __ASSEMBLY__
+
+#define _ASMLANGUAGE
+#include <asm/current.h>
+#include <asm/offsets.h>
+#include <asm/processor.h>
+
+/*
+ * These assembly macros mirror the C macros that follow below.  They
+ * should always have identical functionality.  See
+ * arch/xtensa/kernel/sys.S for usage.
+ */
+
+#define KERNEL_DS       0
+#define USER_DS         1
+
+#define get_ds          (KERNEL_DS)
+
+/*
+ * get_fs reads current->thread.current_ds into a register.
+ * On Entry:
+ *      <ad>    anything
+ *      <sp>    stack
+ * On Exit:
+ *      <ad>    contains current->thread.current_ds
+ */
+        .macro  get_fs  ad, sp
+        GET_CURRENT(\ad,\sp)
+        l32i    \ad, \ad, THREAD_CURRENT_DS
+        .endm
+
+/*
+ * set_fs sets current->thread.current_ds to some value.
+ * On Entry:
+ *      <at>    anything (temp register)
+ *      <av>    value to write
+ *      <sp>    stack
+ * On Exit:
+ *      <at>    destroyed (actually, current)
+ *      <av>    preserved, value to write
+ */
+        .macro  set_fs  at, av, sp
+        GET_CURRENT(\at,\sp)
+        s32i    \av, \at, THREAD_CURRENT_DS
+        .endm
+
+/*
+ * kernel_ok determines whether we should bypass addr/size checking.
+ * See the equivalent C-macro version below for clarity.
+ * On success, kernel_ok branches to a label indicated by parameter
+ * <success>.  This implies that the macro falls through to the next
+ * insruction on an error.
+ *
+ * Note that while this macro can be used independently, we designed
+ * in for optimal use in the access_ok macro below (i.e., we fall
+ * through on error).
+ *
+ * On Entry:
+ *      <at>            anything (temp register)
+ *      <success>       label to branch to on success; implies
+ *                      fall-through macro on error
+ *      <sp>            stack pointer
+ * On Exit:
+ *      <at>            destroyed (actually, current->thread.current_ds)
+ */
+
+#if ((KERNEL_DS != 0) || (USER_DS == 0))
+# error Assembly macro kernel_ok fails
+#endif
+        .macro  kernel_ok  at, sp, success
+        get_fs  \at, \sp
+        beqz    \at, \success
+        .endm
+
+/*
+ * user_ok determines whether the access to user-space memory is allowed.
+ * See the equivalent C-macro version below for clarity.
+ *
+ * On error, user_ok branches to a label indicated by parameter
+ * <error>.  This implies that the macro falls through to the next
+ * instruction on success.
+ *
+ * Note that while this macro can be used independently, we designed
+ * in for optimal use in the access_ok macro below (i.e., we fall
+ * through on success).
+ *
+ * On Entry:
+ *      <aa>    register containing memory address
+ *      <as>    register containing memory size
+ *      <at>    temp register
+ *      <error> label to branch to on error; implies fall-through
+ *              macro on success
+ * On Exit:
+ *      <aa>    preserved
+ *      <as>    preserved
+ *      <at>    destroyed (actually, (TASK_SIZE + 1 - size))
+ */
+        .macro  user_ok aa, as, at, error
+        movi    \at, (TASK_SIZE+1)
+        bgeu    \as, \at, \error
+        sub     \at, \at, \as
+        bgeu    \aa, \at, \error
+        .endm
+
+/*
+ * access_ok determines whether a memory access is allowed.  See the
+ * equivalent C-macro version below for clarity.
+ *
+ * On error, access_ok branches to a label indicated by parameter
+ * <error>.  This implies that the macro falls through to the next
+ * instruction on success.
+ *
+ * Note that we assume success is the common case, and we optimize the
+ * branch fall-through case on success.
+ *
+ * On Entry:
+ *      <aa>    register containing memory address
+ *      <as>    register containing memory size
+ *      <at>    temp register
+ *      <sp>
+ *      <error> label to branch to on error; implies fall-through
+ *              macro on success
+ * On Exit:
+ *      <aa>    preserved
+ *      <as>    preserved
+ *      <at>    destroyed
+ */
+        .macro  access_ok  aa, as, at, sp, error
+        kernel_ok  \at, \sp, .Laccess_ok_\@
+        user_ok    \aa, \as, \at, \error
+.Laccess_ok_\@:
+        .endm
+
+/*
+ * verify_area determines whether a memory access is allowed.  It's
+ * mostly an unnecessary wrapper for access_ok, but we provide it as a
+ * duplicate of the verify_area() C inline function below.  See the
+ * equivalent C version below for clarity.
+ *
+ * On error, verify_area branches to a label indicated by parameter
+ * <error>.  This implies that the macro falls through to the next
+ * instruction on success.
+ *
+ * Note that we assume success is the common case, and we optimize the
+ * branch fall-through case on success.
+ *
+ * On Entry:
+ *      <aa>    register containing memory address
+ *      <as>    register containing memory size
+ *      <at>    temp register
+ *      <error> label to branch to on error; implies fall-through
+ *              macro on success
+ * On Exit:
+ *      <aa>    preserved
+ *      <as>    preserved
+ *      <at>    destroyed
+ */
+        .macro  verify_area     aa, as, at, sp, error
+        access_ok  \at, \aa, \as, \sp, \error
+        .endm
+
+
+#else /* __ASSEMBLY__ not defined */
+
+#include <linux/sched.h>
+#include <asm/types.h>
+
+/*
+ * 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 (Data Segment Register?), these macros are
+ * grossly misnamed.
+ */
+
+#define KERNEL_DS       ((mm_segment_t) { 0 })
+#define USER_DS         ((mm_segment_t) { 1 })
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current->thread.current_ds)
+#define set_fs(val)     (current->thread.current_ds = (val))
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+#define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
+#define __user_ok(addr,size) (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
+#define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
+#define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
+
+extern inline int verify_area(int type, const void * addr, unsigned long size)
+{
+        return access_ok(type,addr,size) ? 0 : -EFAULT;
+}
+
+/*
+ * These are the main single-value transfer routines.  They
+ * automatically use the right size if we just have the right pointer
+ * type.
+ *
+ * This gets kind of ugly. We want to return _two_ values in
+ * "get_user()" and yet we don't want to do any pointers, because that
+ * is too much of a performance impact. Thus we have a few rather ugly
+ * macros here, and hide all the uglyness from the user.
+ *
+ * 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)))
+#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * The "__xxx" versions of the user access functions are versions that
+ * do not verify the address space, that must have been done previously
+ * with a separate "access_ok()" call (this is used when we do multiple
+ * accesses to the same area of user memory).
+ */
+#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
+#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
+
+
+extern long __put_user_bad(void);
+
+#define __put_user_nocheck(x,ptr,size)                  \
+({                                                      \
+        long __pu_err;                                  \
+        __put_user_size((x),(ptr),(size),__pu_err);     \
+        __pu_err;                                       \
+})
+
+#define __put_user_check(x,ptr,size)                            \
+({                                                              \
+        long __pu_err = -EFAULT;                                \
+        __typeof__(*(ptr)) *__pu_addr = (ptr);                  \
+        if (access_ok(VERIFY_WRITE,__pu_addr,size))             \
+                __put_user_size((x),__pu_addr,(size),__pu_err); \
+        __pu_err;                                               \
+})
+
+#define __put_user_size(x,ptr,size,retval)                      \
+do {                                                            \
+        retval = 0;                                             \
+        switch (size) {                                         \
+        case 1: __put_user_asm(x,ptr,retval,1,"s8i");  break;   \
+        case 2: __put_user_asm(x,ptr,retval,2,"s16i"); break;   \
+        case 4: __put_user_asm(x,ptr,retval,4,"s32i"); break;   \
+        case 8: {                                               \
+                     __typeof__(*ptr) __v64 = x;                \
+                     retval = __copy_to_user(ptr,&__v64,8);     \
+                     break;                                     \
+                }                                               \
+        default: __put_user_bad();                              \
+        }                                                       \
+} while (0)
+
+
+/*
+ * Consider a case of a user single load/store would cause both an
+ * unaligned exception and an MMU-related exception (unaligned
+ * exceptions happen first):
+ *
+ * User code passes a bad variable ptr to a system call.
+ * Kernel tries to access the variable.
+ * Unaligned exception occurs.
+ * Unaligned exception handler tries to make aligned accesses.
+ * Double exception occurs for MMU-related cause (e.g., page not mapped).
+ * do_page_fault() thinks the fault address belongs to the kernel, not the
+ * user, and panics.
+ *
+ * The kernel currently prohibits user unaligned accesses.  We use the
+ * __check_align_* macros to check for unaligned addresses before
+ * accessing user space so we don't crash the kernel.  Both
+ * __put_user_asm and __get_user_asm use these alignment macros, so
+ * macro-specific labels such as 0f, 1f, %0, %2, and %3 must stay in
+ * sync.
+ */
+
+#define __check_align_1  ""
+
+#define __check_align_2                         \
+        "   _bbci.l %2,  0, 1f          \n"     \
+        "   movi    %0, %3              \n"     \
+        "   _j      2f                  \n"
+
+#define __check_align_4                         \
+        "   _bbsi.l %2,  0, 0f          \n"     \
+        "   _bbci.l %2,  1, 1f          \n"     \
+        "0: movi    %0, %3              \n"     \
+        "   _j      2f                  \n"
+
+
+/*
+ * We don't tell gcc that we are accessing memory, but this is OK
+ * because we do not write to any memory gcc knows about, so there
+ * are no aliasing issues.
+ *
+ * WARNING: If you modify this macro at all, verify that the
+ * __check_align_* macros still work.
+ */
+#define __put_user_asm(x, addr, err, align, insn) \
+   __asm__ __volatile__(                        \
+        __check_align_##align                   \
+        "1: "insn"  %1, %2, 0           \n"     \
+        "2:                             \n"     \
+        "   .section  .fixup,\"ax\"     \n"     \
+        "   .align 4                    \n"     \
+        "4:                             \n"     \
+        "   .long  2b                   \n"     \
+        "5:                             \n"     \
+        "   l32r   %2, 4b               \n"     \
+        "   movi   %0, %3               \n"     \
+        "   jx     %2                   \n"     \
+        "   .previous                   \n"     \
+        "   .section  __ex_table,\"a\"  \n"     \
+        "   .long       1b, 5b          \n"     \
+        "   .previous"                          \
+        :"=r" (err)                             \
+        :"r" ((int)(x)), "r" (addr), "i" (-EFAULT), "0" (err))
+
+#define __get_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __gu_err, __gu_val;                                \
+        __get_user_size(__gu_val,(ptr),(size),__gu_err);        \
+        (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        __gu_err;                                               \
+})
+
+#define __get_user_check(x,ptr,size)                                    \
+({                                                                      \
+        long __gu_err = -EFAULT, __gu_val = 0;                          \
+        const __typeof__(*(ptr)) *__gu_addr = (ptr);                    \
+        if (access_ok(VERIFY_READ,__gu_addr,size))                      \
+                __get_user_size(__gu_val,__gu_addr,(size),__gu_err);    \
+        (x) = (__typeof__(*(ptr)))__gu_val;                             \
+        __gu_err;                                                       \
+})
+
+extern long __get_user_bad(void);
+
+#define __get_user_size(x,ptr,size,retval)                              \
+do {                                                                    \
+        retval = 0;                                                     \
+        switch (size) {                                                 \
+          case 1: __get_user_asm(x,ptr,retval,1,"l8ui");  break;        \
+          case 2: __get_user_asm(x,ptr,retval,2,"l16ui"); break;        \
+          case 4: __get_user_asm(x,ptr,retval,4,"l32i");  break;        \
+          case 8: retval = __copy_from_user(&x,ptr,8);    break;        \
+          default: (x) = __get_user_bad();                              \
+        }                                                               \
+} while (0)
+
+
+/*
+ * WARNING: If you modify this macro at all, verify that the
+ * __check_align_* macros still work.
+ */
+#define __get_user_asm(x, addr, err, align, insn) \
+   __asm__ __volatile__(                        \
+        __check_align_##align                   \
+        "1: "insn"  %1, %2, 0           \n"     \
+        "2:                             \n"     \
+        "   .section  .fixup,\"ax\"     \n"     \
+        "   .align 4                    \n"     \
+        "4:                             \n"     \
+        "   .long  2b                   \n"     \
+        "5:                             \n"     \
+        "   l32r   %2, 4b               \n"     \
+        "   movi   %1, 0                \n"     \
+        "   movi   %0, %3               \n"     \
+        "   jx     %2                   \n"     \
+        "   .previous                   \n"     \
+        "   .section  __ex_table,\"a\"  \n"     \
+        "   .long       1b, 5b          \n"     \
+        "   .previous"                          \
+        :"=r" (err), "=r" (x)                   \
+        :"r" (addr), "i" (-EFAULT), "0" (err))
+
+
+/*
+ * Copy to/from user space
+ */
+
+/*
+ * We use a generic, arbitrary-sized copy subroutine.  The Xtensa
+ * architecture would cause heavy code bloat if we tried to inline
+ * these functions and provide __constant_copy_* equivalents like the
+ * i386 versions.  __xtensa_copy_user is quite efficient.  See the
+ * .fixup section of __xtensa_copy_user for a discussion on the
+ * X_zeroing equivalents for Xtensa.
+ */
+
+extern unsigned __xtensa_copy_user(void *to, const void *from, unsigned n);
+#define __copy_user(to,from,size) __xtensa_copy_user(to,from,size)
+
+
+static inline unsigned long
+__generic_copy_from_user_nocheck(void *to, const void *from, unsigned long n)
+{
+        return __copy_user(to,from,n);
+}
+
+static inline unsigned long
+__generic_copy_to_user_nocheck(void *to, const void *from, unsigned long n)
+{
+        return __copy_user(to,from,n);
+}
+
+static inline unsigned long
+__generic_copy_to_user(void *to, const void *from, unsigned long n)
+{
+        prefetch(from);
+        if (access_ok(VERIFY_WRITE, to, n))
+                return __copy_user(to,from,n);
+        return n;
+}
+
+static inline unsigned long
+__generic_copy_from_user(void *to, const void *from, unsigned long n)
+{
+        prefetchw(to);
+        if (access_ok(VERIFY_READ, from, n))
+                return __copy_user(to,from,n);
+        else
+                memset(to, 0, n);
+        return n;
+}
+
+#define copy_to_user(to,from,n) __generic_copy_to_user((to),(from),(n))
+#define copy_from_user(to,from,n) __generic_copy_from_user((to),(from),(n))
+#define __copy_to_user(to,from,n) __generic_copy_to_user_nocheck((to),(from),(n))
+#define __copy_from_user(to,from,n) __generic_copy_from_user_nocheck((to),(from),(n))
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+
+/*
+ * We need to return the number of bytes not cleared.  Our memset()
+ * returns zero if a problem occurs while accessing user-space memory.
+ * In that event, return no memory cleared.  Otherwise, zero for
+ * success.
+ */
+
+extern inline unsigned long
+__xtensa_clear_user(void *addr, unsigned long size)
+{
+        if ( ! memset(addr, 0, size) )
+                return size;
+        return 0;
+}
+
+extern inline unsigned long
+clear_user(void *addr, unsigned long size)
+{
+        if (access_ok(VERIFY_WRITE, addr, size))
+                return __xtensa_clear_user(addr, size);
+        return size ? -EFAULT : 0;
+}
+
+#define __clear_user  __xtensa_clear_user
+
+
+extern long __strncpy_user(char *, const char *, long);
+#define __strncpy_from_user __strncpy_user
+
+extern inline long
+strncpy_from_user(char *dst, const char *src, long count)
+{
+        if (access_ok(VERIFY_READ, src, 1))
+                return __strncpy_from_user(dst, src, count);
+        return -EFAULT;
+}
+
+
+#define strlen_user(str) strnlen_user((str), TASK_SIZE - 1)
+
+/*
+ * Return the size of a string (including the ending 0!)
+ */
+extern long __strnlen_user(const char *, long);
+
+extern inline long strnlen_user(const char *str, long len)
+{
+        unsigned long top = __kernel_ok ? ~0UL : TASK_SIZE - 1;
+
+        if ((unsigned long)str > top)
+                return 0;
+        return __strnlen_user(str, len);
+}
+
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup.unit otherwise.  */
+
+extern unsigned long search_exception_table(unsigned long addr);
+extern void sort_exception_table(void);
+
+/* Returns the new pc */
+#define fixup_exception(map_reg, fixup_unit, pc)                \
+({                                                              \
+        fixup_unit;                                             \
+})
+
+#endif  /* __ASSEMBLY__ */
+#endif  /* _XTENSA_UACCESS_H */