From: David Holsgrove david.holsgrove@xilinx.com
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 --- arch/microblaze/lib/Makefile | 1 + arch/microblaze/lib/muldi3.c | 91 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 92 insertions(+), 0 deletions(-) create mode 100644 arch/microblaze/lib/muldi3.c
diff --git a/arch/microblaze/lib/Makefile b/arch/microblaze/lib/Makefile index 7730695..8d7febd 100644 --- a/arch/microblaze/lib/Makefile +++ b/arch/microblaze/lib/Makefile @@ -29,6 +29,7 @@ SOBJS-y +=
COBJS-y += board.o COBJS-y += bootm.o +COBJS-y += muldi3.o
SRCS := $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y)) diff --git a/arch/microblaze/lib/muldi3.c b/arch/microblaze/lib/muldi3.c new file mode 100644 index 0000000..76d7590 --- /dev/null +++ b/arch/microblaze/lib/muldi3.c @@ -0,0 +1,91 @@ +/* + * 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; +}