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 */