arch/m68k/include/asm/libgcc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_M68K_LIBGCC_H
   3 #define __ASM_M68K_LIBGCC_H
   4
   5 #ifndef CONFIG_CPU_HAS_NO_MULDIV64
   6 /*
   7  * For those 68K CPUs that support 64bit multiply define umul_ppm()
   8  * for the common muldi3 libgcc helper function (in lib/muldi3.c).
   9  * CPUs that don't have it (like the original 68000 and ColdFire)
  10  * will fallback to using the C-coded version of umul_ppmm().
  11  */
  12 #define umul_ppmm(w1, w0, u, v)                         \
  13         do {                                            \
  14                 unsigned long __u = (u), __v = (v);     \
  15                 unsigned long __w0, __w1;               \
  16                                                         \
  17                 __asm__ ("mulu%.l %3,%1:%0"             \
  18                          : "=d" (__w0),                 \
  19                            "=d" (__w1)                  \
  20                          : "%0" (__u),                  \
  21                            "dmi" (__v));                \
  22                                                         \
  23                 (w0) = __w0; (w1) = __w1;               \
  24         } while (0)
  25 #endif /* !CONFIG_CPU_HAS_NO_MULDIV64 */
  26
  27 #endif /* __ASM_M68K_LIBGCC_H */