MIPS: Rewrite <asm/div64.h> to work with gcc 4.4.0.
Ralf Baechle [Thu, 30 Apr 2009 16:14:56 +0000 (18:14 +0200)]
The inline assembler used on 32-bit kernels was using the "h" constraint
which was considered dangerous and removed for gcc 4.4.0.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/div64.h

index d1d6991..dc5ea57 100644 (file)
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
-#ifndef _ASM_DIV64_H
-#define _ASM_DIV64_H
+#ifndef __ASM_DIV64_H
+#define __ASM_DIV64_H
 
-#include <linux/types.h>
+#include <asm-generic/div64.h>
 
-#if (_MIPS_SZLONG == 32)
+#if BITS_PER_LONG == 64
 
-#include <asm/compiler.h>
+#include <linux/types.h>
 
 /*
  * No traps on overflows for any of these...
  */
 
-#define do_div64_32(res, high, low, base) ({ \
-       unsigned long __quot32, __mod32; \
-       unsigned long __cf, __tmp, __tmp2, __i; \
-       \
-       __asm__(".set   push\n\t" \
-               ".set   noat\n\t" \
-               ".set   noreorder\n\t" \
-               "move   %2, $0\n\t" \
-               "move   %3, $0\n\t" \
-               "b      1f\n\t" \
-               " li    %4, 0x21\n" \
-               "0:\n\t" \
-               "sll    $1, %0, 0x1\n\t" \
-               "srl    %3, %0, 0x1f\n\t" \
-               "or     %0, $1, %5\n\t" \
-               "sll    %1, %1, 0x1\n\t" \
-               "sll    %2, %2, 0x1\n" \
-               "1:\n\t" \
-               "bnez   %3, 2f\n\t" \
-               " sltu  %5, %0, %z6\n\t" \
-               "bnez   %5, 3f\n" \
-               "2:\n\t" \
-               " addiu %4, %4, -1\n\t" \
-               "subu   %0, %0, %z6\n\t" \
-               "addiu  %2, %2, 1\n" \
-               "3:\n\t" \
-               "bnez   %4, 0b\n\t" \
-               " srl   %5, %1, 0x1f\n\t" \
-               ".set   pop" \
-               : "=&r" (__mod32), "=&r" (__tmp), \
-                 "=&r" (__quot32), "=&r" (__cf), \
-                 "=&r" (__i), "=&r" (__tmp2) \
-               : "Jr" (base), "0" (high), "1" (low)); \
-       \
-       (res) = __quot32; \
-       __mod32; })
-
-#define do_div(n, base) ({ \
-       unsigned long long __quot; \
-       unsigned long __mod; \
-       unsigned long long __div; \
-       unsigned long __upper, __low, __high, __base; \
-       \
-       __div = (n); \
-       __base = (base); \
-       \
-       __high = __div >> 32; \
-       __low = __div; \
-       __upper = __high; \
-       \
-       if (__high) \
-               __asm__("divu   $0, %z2, %z3" \
-                       : "=h" (__upper), "=l" (__high) \
-                       : "Jr" (__high), "Jr" (__base) \
-                       : GCC_REG_ACCUM); \
-       \
-       __mod = do_div64_32(__low, __upper, __low, __base); \
-       \
-       __quot = __high; \
-       __quot = __quot << 32 | __low; \
-       (n) = __quot; \
-       __mod; })
-
-#endif /* (_MIPS_SZLONG == 32) */
-
-#if (_MIPS_SZLONG == 64)
-
-/*
- * Hey, we're already 64-bit, no
- * need to play games..
- */
-#define do_div(n, base) ({ \
-       unsigned long __quot; \
-       unsigned int __mod; \
-       unsigned long __div; \
-       unsigned int __base; \
-       \
-       __div = (n); \
-       __base = (base); \
-       \
-       __mod = __div % __base; \
-       __quot = __div / __base; \
-       \
-       (n) = __quot; \
-       __mod; })
+#define __div64_32(n, base)                                            \
+({                                                                     \
+       unsigned long __cf, __tmp, __tmp2, __i;                         \
+       unsigned long __quot32, __mod32;                                \
+       unsigned long __high, __low;                                    \
+       unsigned long long __n;                                         \
+                                                                       \
+       __high = *__n >> 32;                                            \
+       __low = __n;                                                    \
+       __asm__(                                                        \
+       "       .set    push                                    \n"     \
+       "       .set    noat                                    \n"     \
+       "       .set    noreorder                               \n"     \
+       "       move    %2, $0                                  \n"     \
+       "       move    %3, $0                                  \n"     \
+       "       b       1f                                      \n"     \
+       "        li     %4, 0x21                                \n"     \
+       "0:                                                     \n"     \
+       "       sll     $1, %0, 0x1                             \n"     \
+       "       srl     %3, %0, 0x1f                            \n"     \
+       "       or      %0, $1, %5                              \n"     \
+       "       sll     %1, %1, 0x1                             \n"     \
+       "       sll     %2, %2, 0x1                             \n"     \
+       "1:                                                     \n"     \
+       "       bnez    %3, 2f                                  \n"     \
+       "        sltu   %5, %0, %z6                             \n"     \
+       "       bnez    %5, 3f                                  \n"     \
+       "2:                                                     \n"     \
+       "        addiu  %4, %4, -1                              \n"     \
+       "       subu    %0, %0, %z6                             \n"     \
+       "       addiu   %2, %2, 1                               \n"     \
+       "3:                                                     \n"     \
+       "       bnez    %4, 0b\n\t"                                     \
+       "        srl    %5, %1, 0x1f\n\t"                               \
+       "       .set    pop"                                            \
+       : "=&r" (__mod32), "=&r" (__tmp),                               \
+         "=&r" (__quot32), "=&r" (__cf),                               \
+         "=&r" (__i), "=&r" (__tmp2)                                   \
+       : "Jr" (base), "0" (__high), "1" (__low));                      \
+                                                                       \
+       (__n) = __quot32;                                               \
+       __mod32;                                                        \
+})
 
-#endif /* (_MIPS_SZLONG == 64) */
+#endif /* BITS_PER_LONG == 64 */
 
-#endif /* _ASM_DIV64_H */
+#endif /* __ASM_DIV64_H */