Commit 72fbfb26 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] Fix optimization for size build. 


    
It took a while longer than on other architectures but gcc has finally
started to strike us as well ...
    
This also fixes the damage by 6edfba1b.
    
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent aac076f8

arch/mips/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/mips/lib/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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)

arch/mips/lib/ashldi3.c

0 → 100644
+29 −0
Original line number Diff line number Diff line 
#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);

arch/mips/lib/ashrdi3.c

0 → 100644
+31 −0
Original line number Diff line number Diff line 
#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);

arch/mips/lib/libgcc.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
#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 */

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