diff options
| -rw-r--r-- | arch/mips/lib/Makefile | 20 | ||||
| -rw-r--r-- | arch/mips/lib/ashldi3.c | 25 | ||||
| -rw-r--r-- | arch/mips/lib/ashrdi3.c | 27 | ||||
| -rw-r--r-- | arch/mips/lib/libgcc.h | 25 | ||||
| -rw-r--r-- | arch/mips/lib/lshrdi3.c | 25 |
5 files changed, 122 insertions, 0 deletions
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile index 9244f31..967e98a 100644 --- a/arch/mips/lib/Makefile +++ b/arch/mips/lib/Makefile @@ -25,6 +25,13 @@ include $(TOPDIR)/config.mk LIB = $(obj)lib$(ARCH).o +## Build a couple of necessary functions into a private libgcc +LIBGCC = $(obj)libgcc.o +GLSOBJS += ashldi3.o +GLSOBJS += ashrdi3.o +GLSOBJS += lshrdi3.o +LGOBJS := $(addprefix $(obj),$(GLSOBJS)) + SOBJS-y += COBJS-y += board.o @@ -37,9 +44,22 @@ endif SRCS := $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y)) +# Always build libmips.o +TARGETS := $(LIB) + +# Build private libgcc only when asked for +ifdef USE_PRIVATE_LIBGCC +TARGETS += $(LIBGCC) +endif + +all: $(TARGETS) + $(LIB): $(obj).depend $(OBJS) $(call cmd_link_o_target, $(OBJS)) +$(LIBGCC): $(obj).depend $(LGOBJS) + $(call cmd_link_o_target, $(LGOBJS)) + ######################################################################### # defines $(obj).depend target diff --git a/arch/mips/lib/ashldi3.c b/arch/mips/lib/ashldi3.c new file mode 100644 index 0000000..9b50d86 --- /dev/null +++ b/arch/mips/lib/ashldi3.c @@ -0,0 +1,25 @@ +#include "libgcc.h" + +long long __ashldi3(long long u, word_type b) +{ + DWunion uu, w; + word_type bm; + + if (b == 0) + return u; + + uu.ll = u; + bm = 32 - b; + + if (bm <= 0) { + w.s.low = 0; + w.s.high = (unsigned int) uu.s.low << -bm; + } else { + const unsigned int carries = (unsigned int) uu.s.low >> bm; + + w.s.low = (unsigned int) uu.s.low << b; + w.s.high = ((unsigned int) uu.s.high << b) | carries; + } + + return w.ll; +} diff --git a/arch/mips/lib/ashrdi3.c b/arch/mips/lib/ashrdi3.c new file mode 100644 index 0000000..f30359b --- /dev/null +++ b/arch/mips/lib/ashrdi3.c @@ -0,0 +1,27 @@ +#include "libgcc.h" + +long long __ashrdi3(long long u, word_type b) +{ + DWunion uu, w; + word_type bm; + + if (b == 0) + return u; + + uu.ll = u; + bm = 32 - b; + + if (bm <= 0) { + /* w.s.high = 1..1 or 0..0 */ + w.s.high = + uu.s.high >> 31; + w.s.low = uu.s.high >> -bm; + } else { + const unsigned int carries = (unsigned int) uu.s.high << bm; + + w.s.high = uu.s.high >> b; + w.s.low = ((unsigned int) uu.s.low >> b) | carries; + } + + return w.ll; +} diff --git a/arch/mips/lib/libgcc.h b/arch/mips/lib/libgcc.h new file mode 100644 index 0000000..05909d5 --- /dev/null +++ b/arch/mips/lib/libgcc.h @@ -0,0 +1,25 @@ +#ifndef __ASM_LIBGCC_H +#define __ASM_LIBGCC_H + +#include <asm/byteorder.h> + +typedef int word_type __attribute__ ((mode (__word__))); + +#ifdef __BIG_ENDIAN +struct DWstruct { + int high, low; +}; +#elif defined(__LITTLE_ENDIAN) +struct DWstruct { + int low, high; +}; +#else +#error I feel sick. +#endif + +typedef union { + struct DWstruct s; + long long ll; +} DWunion; + +#endif /* __ASM_LIBGCC_H */ diff --git a/arch/mips/lib/lshrdi3.c b/arch/mips/lib/lshrdi3.c new file mode 100644 index 0000000..bb340ac --- /dev/null +++ b/arch/mips/lib/lshrdi3.c @@ -0,0 +1,25 @@ +#include "libgcc.h" + +long long __lshrdi3(long long u, word_type b) +{ + DWunion uu, w; + word_type bm; + + if (b == 0) + return u; + + uu.ll = u; + bm = 32 - b; + + if (bm <= 0) { + w.s.high = 0; + w.s.low = (unsigned int) uu.s.high >> -bm; + } else { + const unsigned int carries = (unsigned int) uu.s.high << bm; + + w.s.high = (unsigned int) uu.s.high >> b; + w.s.low = ((unsigned int) uu.s.low >> b) | carries; + } + + return w.ll; +} |