diff options
| -rw-r--r-- | arch/mips/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/lib/Makefile | 3 | ||||
| -rw-r--r-- | arch/mips/lib/ashldi3.c | 29 | ||||
| -rw-r--r-- | arch/mips/lib/ashrdi3.c | 31 | ||||
| -rw-r--r-- | arch/mips/lib/libgcc.h | 26 | ||||
| -rw-r--r-- | arch/mips/lib/lshrdi3.c | 29 |
6 files changed, 120 insertions, 0 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index 133900a..aa37ae6 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -83,6 +83,8 @@ cflags-y += -msoft-float LDFLAGS_vmlinux += -G 0 -static -n -nostdlib MODFLAGS += -mlong-calls +cflags-y += -ffreestanding + # # We explicitly add the endianness specifier if needed, this allows # to compile kernels with a toolchain for the other endianness. We diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile index cf12caf..b225543 100644 --- a/arch/mips/lib/Makefile +++ b/arch/mips/lib/Makefile @@ -7,4 +7,7 @@ lib-y += csum_partial_copy.o memcpy.o promlib.o strlen_user.o strncpy_user.o \ obj-y += iomap.o +# libgcc-style stuff needed in the kernel +lib-y += ashldi3.o ashrdi3.o lshrdi3.o + EXTRA_AFLAGS := $(CFLAGS) diff --git a/arch/mips/lib/ashldi3.c b/arch/mips/lib/ashldi3.c new file mode 100644 index 0000000..beb80f31 --- /dev/null +++ b/arch/mips/lib/ashldi3.c @@ -0,0 +1,29 @@ +#include <linux/module.h> + +#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; +} + +EXPORT_SYMBOL(__ashldi3); diff --git a/arch/mips/lib/ashrdi3.c b/arch/mips/lib/ashrdi3.c new file mode 100644 index 0000000..c884a91 --- /dev/null +++ b/arch/mips/lib/ashrdi3.c @@ -0,0 +1,31 @@ +#include <linux/module.h> + +#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; +} + +EXPORT_SYMBOL(__ashrdi3); diff --git a/arch/mips/lib/libgcc.h b/arch/mips/lib/libgcc.h new file mode 100644 index 0000000..3f19d1c --- /dev/null +++ b/arch/mips/lib/libgcc.h @@ -0,0 +1,26 @@ +#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..dcf8d68 --- /dev/null +++ b/arch/mips/lib/lshrdi3.c @@ -0,0 +1,29 @@ +#include <linux/module.h> + +#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; +} + +EXPORT_SYMBOL(__lshrdi3); |
