On 29/02/2016 20:44, Andrew Jones wrote: > On Mon, Feb 29, 2016 at 06:49:06PM +0100, Laurent Vivier wrote: >> This patch allows to build tests for ppc64 little endian target >> (ppc64le) on big and little endian hosts. >> >> We add a new parameter to configure to select the endianness of the >> tests (--endian=little or --endian=big). >> >> I have built and tested big and little endian tests on a little >> endian host, a big endian host, with kvm_hv and kvm_pr, and on >> x86_64 with ppc64 as a TCG target. >> >> Signed-off-by: Laurent Vivier <lvivier@xxxxxxxxxx> >> --- >> configure | 11 +++++++++++ >> lib/powerpc/asm/ppc_asm.h | 19 +++++++++++++++++++ >> lib/ppc64/asm/io.h | 8 ++++++++ >> powerpc/Makefile.common | 3 ++- >> powerpc/Makefile.ppc64 | 9 +++++++-- >> powerpc/cstart64.S | 20 ++++++++++++++++---- >> 6 files changed, 63 insertions(+), 7 deletions(-) >> >> diff --git a/configure b/configure >> index a685cca..90e39d4 100755 >> --- a/configure >> +++ b/configure >> @@ -10,6 +10,7 @@ ar=ar >> arch=`uname -m | sed -e 's/i.86/i386/;s/arm.*/arm/;s/ppc64.*/ppc64/'` >> host=$arch >> cross_prefix= >> +endian="" >> >> usage() { >> cat <<-EOF >> @@ -23,6 +24,7 @@ usage() { >> --ld=LD ld linker to use ($ld) >> --prefix=PREFIX where to install things ($prefix) >> --kerneldir=DIR kernel build directory for kvm.h ($kerneldir) >> + --endian=ENDIAN endianness to compile for (little or big, ppc64 only) >> EOF >> exit 1 >> } >> @@ -50,6 +52,9 @@ while [[ "$1" = -* ]]; do >> --cross-prefix) >> cross_prefix="$arg" >> ;; >> + --endian) >> + endian="$arg" >> + ;; >> --cc) >> cc="$arg" >> ;; >> @@ -84,6 +89,11 @@ elif [ "$arch" = "arm" ] || [ "$arch" = "arm64" ]; then >> elif [ "$arch" = "ppc64" ]; then >> testdir=powerpc >> firmware="$testdir/boot_rom.bin" >> + if [ "$endian" != "little" ] && [ "$endian" != "big" ]; then >> + echo "You must provide endianness (big or little)!" >> + usage >> + exit 1 > > redundant 'exit 1', usage() already has one in it OK > >> + fi >> else >> testdir=$arch >> fi >> @@ -139,4 +149,5 @@ AR=$cross_prefix$ar >> API=$api >> TEST_DIR=$testdir >> FIRMWARE=$firmware >> +ENDIAN=$endian >> EOF >> diff --git a/lib/powerpc/asm/ppc_asm.h b/lib/powerpc/asm/ppc_asm.h >> index f63bb72..f18100e 100644 >> --- a/lib/powerpc/asm/ppc_asm.h >> +++ b/lib/powerpc/asm/ppc_asm.h >> @@ -11,4 +11,23 @@ >> #define LOAD_REG_ADDR(reg,name) \ >> ld reg,name@got(r2) >> >> +#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ >> + >> +#define FIXUP_ENDIAN >> + >> +#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ >> + >> +#define FIXUP_ENDIAN \ >> + .long 0x05000048; /* bl . + 4 */ \ >> + .long 0xa602487d; /* mflr r10 */ \ >> + .long 0x20004a39; /* addi r10,r10,32 */ \ >> + .long 0xa600607d; /* mfmsr r11 */ \ >> + .long 0x01006b69; /* xori r11,r11,1 */ \ >> + .long 0xa6035a7d; /* mtsrr0 r10 */ \ >> + .long 0xa6037b7d; /* mtsrr1 r11 */ \ >> + .long 0x2400004c; /* rfid */ \ >> + .long 0x00000048; /* b . */ \ >> + >> +#endif /* __BYTE_ORDER__ */ >> + >> #endif /* _ASMPOWERPC_PPC_ASM_H */ >> diff --git a/lib/ppc64/asm/io.h b/lib/ppc64/asm/io.h >> index c0801d4..4f2c31b 100644 >> --- a/lib/ppc64/asm/io.h >> +++ b/lib/ppc64/asm/io.h >> @@ -1,5 +1,13 @@ >> #ifndef _ASMPPC64_IO_H_ >> #define _ASMPPC64_IO_H_ >> + >> +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ >> +#define __cpu_is_be() (0) >> +#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ >> #define __cpu_is_be() (1) >> +#else >> +#error Undefined byte order >> +#endif >> + >> #include <asm-generic/io.h> >> #endif >> diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common >> index cc27ac8..b526668 100644 >> --- a/powerpc/Makefile.common >> +++ b/powerpc/Makefile.common >> @@ -11,7 +11,6 @@ all: $(TEST_DIR)/boot_rom.bin test_cases >> >> ################################################################## >> >> -CFLAGS += $(arch_CFLAGS) >> CFLAGS += -std=gnu99 >> CFLAGS += -ffreestanding >> CFLAGS += -Wextra >> @@ -32,6 +31,7 @@ cflatobjs += lib/powerpc/setup.o >> cflatobjs += lib/powerpc/rtas.o >> >> FLATLIBS = $(libcflat) $(LIBFDT_archive) >> +%.elf: CFLAGS += $(arch_CFLAGS) >> %.elf: LDFLAGS = $(arch_LDFLAGS) -nostdlib -pie >> %.elf: %.o $(FLATLIBS) powerpc/flat.lds >> $(LD) $(LDFLAGS) -o $@ \ >> @@ -48,6 +48,7 @@ $(TEST_DIR)/boot_rom.bin: $(TEST_DIR)/boot_rom.elf >> dd if=/dev/zero of=$@ bs=256 count=1 >> $(OBJCOPY) -O binary $^ >(cat - >>$@) >> >> +$(TEST_DIR)/boot_rom.elf: CFLAGS = -mbig-endian >> $(TEST_DIR)/boot_rom.elf: $(TEST_DIR)/boot_rom.o >> $(LD) -EB -nostdlib -Ttext=0x100 --entry=start --build-id=none -o $@ $< >> >> diff --git a/powerpc/Makefile.ppc64 b/powerpc/Makefile.ppc64 >> index 2df44d4..3da3a83 100644 >> --- a/powerpc/Makefile.ppc64 >> +++ b/powerpc/Makefile.ppc64 >> @@ -5,8 +5,13 @@ >> # >> bits = 64 >> >> -arch_CFLAGS = -mbig-endian >> -arch_LDFLAGS = -EB >> +ifeq ($(ENDIAN),little) >> + arch_CFLAGS = -mlittle-endian >> + arch_LDFLAGS = -EL >> +else >> + arch_CFLAGS = -mbig-endian >> + arch_LDFLAGS = -EB >> +endif >> >> cstart.o = $(TEST_DIR)/cstart64.o >> reloc.o = $(TEST_DIR)/reloc64.o >> diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S >> index 6072597..62078a4 100644 >> --- a/powerpc/cstart64.S >> +++ b/powerpc/cstart64.S >> @@ -16,6 +16,7 @@ >> */ >> .globl start >> start: >> + FIXUP_ENDIAN >> /* >> * We were loaded at QEMU's kernel load address, but we're not >> * allowed to link there due to how QEMU deals with linker VMAs, >> @@ -84,12 +85,23 @@ halt: >> enter_rtas: >> mflr r0 >> std r0, 16(r1) >> + >> + LOAD_REG_ADDR(r10, rtas_return_loc) >> + mtlr r10 >> LOAD_REG_ADDR(r11, rtas_entry) >> ld r10, 0(r11) >> -//FIXME: change this bctrl to an rtas-prep, rfid, rtas-return sequence >> - mtctr r10 >> - nop >> - bctrl >> + >> + mfmsr r11 >> +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ >> + xori r11,r11,1 >> +#endif > > We can avoid the #if. > > LOAD_REG_IMMEDIATE(r9, RTAS_MSR_MASK) > and r11, r11, r9 > > Right now we'll define RTAS_MSR_MASK to the boring value of > 0xfffffffffffffffe, but presumably that'll change some day. OK >> + mtsrr0 r10 >> + mtsrr1 r11 >> + rfid >> + b . >> + >> +rtas_return_loc: >> + FIXUP_ENDIAN >> ld r0, 16(r1) >> mtlr r0 >> blr >> -- >> 2.5.0 > > Thanks, > drew > Thanks, Laurent -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html