Commit 1421dc6d authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS 



The powerpc toolchain can compile combinations of 32/64 bit and
big/little endian, so it's convenient to consider, e.g.,

  `CC -m64 -mbig-endian`

To be the C compiler for the purpose of invoking it to build target
artifacts. So overriding the CC variable to include these flags works
for this purpose.

Unfortunately that is not compatible with the way the proposed new
Kconfig macro language will work.

After previous patches in this series, these flags can be carefully
passed in using flags instead.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent af3901cb

arch/powerpc/Makefile

+9 −7
Original line number Diff line number Diff line
@@ -75,13 +75,15 @@ endif 
endif



ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)

override LD	+= -EL

KBUILD_CFLAGS	+= -mlittle-endian

LDFLAGS		+= -EL

LDEMULATION	:= lppc

GNUTARGET	:= powerpcle

MULTIPLEWORD	:= -mno-multiple

KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)

else

override LD	+= -EB

KBUILD_CFLAGS += $(call cc-option,-mbig-endian)

LDFLAGS		+= -EB

LDEMULATION	:= ppc

GNUTARGET	:= powerpc

MULTIPLEWORD	:= -mmultiple
@@ -94,19 +96,19 @@ aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1) 
aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mabi=elfv2

endif



cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian

cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)

ifneq ($(cc-name),clang)

  cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mno-strict-align

endif



cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)

cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian

aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)

aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian



ifeq ($(HAS_BIARCH),y)

override AS	+= -a$(BITS)

override LD	+= -m elf$(BITS)$(LDEMULATION)

override CC	+= -m$(BITS)

KBUILD_CFLAGS	+= -m$(BITS)

KBUILD_AFLAGS	+= -m$(BITS) -Wl,-a$(BITS)

LDFLAGS		+= -m elf$(BITS)$(LDEMULATION)

KBUILD_ARFLAGS	+= --target=elf$(BITS)-$(GNUTARGET)

endif

arch/powerpc/tools/gcc-check-mprofile-kernel.sh

+8 −4
Original line number Diff line number Diff line
@@ -7,17 +7,21 @@ set -o pipefail 
# To debug, uncomment the following line

# set -x



# -mprofile-kernel is only supported on 64le, so this should not be invoked

# for other targets. Therefore we can pass in -m64 and -mlittle-endian

# explicitly, to take care of toolchains defaulting to other targets.



# Test whether the compile option -mprofile-kernel exists and generates

# profiling code (ie. a call to _mcount()).

echo "int func() { return 0; }" | \

    $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \

    grep -q "_mcount"

    $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \

    2> /dev/null | grep -q "_mcount"



# Test whether the notrace attribute correctly suppresses calls to _mcount().



echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \

    $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \

    grep -q "_mcount" && \

    $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \

    2> /dev/null | grep -q "_mcount" && \

    exit 1



echo "OK"

scripts/recordmcount.pl

+17 −1
Original line number Diff line number Diff line
@@ -266,13 +266,29 @@ if ($arch eq "x86_64") { 
    $objcopy .= " -O elf32-sh-linux";



} elsif ($arch eq "powerpc") {

    my $ldemulation;



    $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)";

    # See comment in the sparc64 section for why we use '\w'.

    $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?\\w*?)>:";

    $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$";



    if ($endian eq "big") {

	    $cc .= " -mbig-endian ";

	    $ld .= " -EB ";

	    $ldemulation = "ppc"

    } else {

	    $cc .= " -mlittle-endian ";

	    $ld .= " -EL ";

	    $ldemulation = "lppc"

    }

    if ($bits == 64) {

        $type = ".quad";

        $cc .= " -m64 ";

        $ld .= " -m elf64".$ldemulation." ";

    } else {

        $cc .= " -m32 ";

        $ld .= " -m elf32".$ldemulation." ";

    }



} elsif ($arch eq "arm") {

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