mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
2281ba5172
Referenced arch/blackfin/lib/muldi3.c and the linux kernel. Resolves issue seen when building u-boot for HW_MUL=0; PLATFORM_CPPFLAGS += -mxl-soft-mul PLATFORM_CPPFLAGS += -mno-xl-multiply-high which resulted in error while linking to libgcc.a without mul hw (bs / m); libgcc.a(_muldi3.o): In function `__muldi3': .... src/gcc-4.6.2/libgcc/libgcc2.c:550: undefined reference to `_GLOBAL_OFFSET_TABLE_' This link failure would not occur if we used gcc instead of ld directly, as gcc will correctly use the crt's to resolve this link. Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*
|
|
* U-boot - muldi3.c contains routines for mult and div
|
|
*
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
|
|
/* Generic function got from GNU gcc package, libgcc2.c */
|
|
#ifndef SI_TYPE_SIZE
|
|
#define SI_TYPE_SIZE 32
|
|
#endif
|
|
#define __ll_B (1L << (SI_TYPE_SIZE / 2))
|
|
#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
|
|
#define __ll_highpart(t) ((USItype) (t) / __ll_B)
|
|
#define BITS_PER_UNIT 8
|
|
|
|
#if !defined(umul_ppmm)
|
|
#define umul_ppmm(w1, w0, u, v) \
|
|
do { \
|
|
USItype __x0, __x1, __x2, __x3; \
|
|
USItype __ul, __vl, __uh, __vh; \
|
|
\
|
|
__ul = __ll_lowpart(u); \
|
|
__uh = __ll_highpart(u); \
|
|
__vl = __ll_lowpart(v); \
|
|
__vh = __ll_highpart(v); \
|
|
\
|
|
__x0 = (USItype) __ul * __vl; \
|
|
__x1 = (USItype) __ul * __vh; \
|
|
__x2 = (USItype) __uh * __vl; \
|
|
__x3 = (USItype) __uh * __vh; \
|
|
\
|
|
__x1 += __ll_highpart(__x0); /* this can't give carry */\
|
|
__x1 += __x2; /* but this indeed can */ \
|
|
if (__x1 < __x2) /* did we get it? */ \
|
|
__x3 += __ll_B; /* yes, add it in the proper pos. */ \
|
|
\
|
|
(w1) = __x3 + __ll_highpart(__x1); \
|
|
(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
|
|
} while (0)
|
|
#endif
|
|
|
|
#if !defined(__umulsidi3)
|
|
#define __umulsidi3(u, v) \
|
|
({DIunion __w; \
|
|
umul_ppmm(__w.s.high, __w.s.low, u, v); \
|
|
__w.ll; })
|
|
#endif
|
|
|
|
typedef unsigned int USItype __attribute__ ((mode(SI)));
|
|
typedef int SItype __attribute__ ((mode(SI)));
|
|
typedef int DItype __attribute__ ((mode(DI)));
|
|
typedef int word_type __attribute__ ((mode(__word__)));
|
|
|
|
struct DIstruct {
|
|
SItype low, high;
|
|
};
|
|
typedef union {
|
|
struct DIstruct s;
|
|
DItype ll;
|
|
} DIunion;
|
|
|
|
DItype __muldi3(DItype u, DItype v)
|
|
{
|
|
DIunion w;
|
|
DIunion uu, vv;
|
|
|
|
uu.ll = u, vv.ll = v;
|
|
/* panic("kernel panic for __muldi3"); */
|
|
w.ll = __umulsidi3(uu.s.low, vv.s.low);
|
|
w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
|
|
+ (USItype) uu.s.high * (USItype) vv.s.low);
|
|
|
|
return w.ll;
|
|
}
|