25c8a78b1e
The recent merge of fpu.S broken the handling of fpscr for ARCH=powerpc and CONFIG_PPC64=y. FP registers could be corrupted, leading to strange random application crashes. The confusion arises, because the thread_struct has (and requires) a 64-bit area to save the fpscr, because we use load/store double instructions to get it in to/out of the FPU. However, only the low 32-bits are actually used, so we want to treat it as a 32-bit quantity when manipulating its bits to avoid extra load/stores on 32-bit. This patch replaces the current definition with a structure of two 32-bit quantities (pad and val), to clarify things as much as is possible. The 'val' field is used when manipulating bits, the structure itself is used when obtaining the address for loading/unloading the value from the FPU. While we're at it, consolidate the 4 (!) almost identical versions of cvt_fd() and cvt_df() (arch/ppc/kernel/misc.S, arch/ppc64/kernel/misc.S, arch/powerpc/kernel/misc_32.S, arch/powerpc/kernel/misc_64.S) into a single version in fpu.S. The new version takes a pointer to thread_struct and applies the correct offset itself, rather than a pointer to the fpscr field itself, again to avoid confusion as to which is the correct field to use. Finally, this patch makes ARCH=ppc64 also use the consolidated fpu.S code, which it previously did not. Built for G5 (ARCH=ppc64 and ARCH=powerpc), 32-bit powermac (ARCH=ppc and ARCH=powerpc) and Walnut (ARCH=ppc, CONFIG_MATH_EMULATION=y). Booted on G5 (ARCH=powerpc) and things which previously fell over no longer do. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
139 lines
4.5 KiB
Makefile
139 lines
4.5 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Changes for PPC by Gary Thomas
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# Rewritten by Cort Dougan and Paul Mackerras
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# Adjusted for PPC64 by Tom Gall
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#
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KERNELLOAD := 0xc000000000000000
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# Set default 32 bits cross compilers for vdso and boot wrapper
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CROSS32_COMPILE ?=
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CROSS32CC := $(CROSS32_COMPILE)gcc
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CROSS32AS := $(CROSS32_COMPILE)as
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CROSS32LD := $(CROSS32_COMPILE)ld
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CROSS32OBJCOPY := $(CROSS32_COMPILE)objcopy
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# If we have a biarch compiler, use it for 32 bits cross compile if
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# CROSS32_COMPILE wasn't explicitely defined, and add proper explicit
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# target type to target compilers
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HAS_BIARCH := $(call cc-option-yn, -m64)
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ifeq ($(HAS_BIARCH),y)
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ifeq ($(CROSS32_COMPILE),)
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CROSS32CC := $(CC) -m32
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CROSS32AS := $(AS) -a32
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CROSS32LD := $(LD) -m elf32ppc
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CROSS32OBJCOPY := $(OBJCOPY)
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endif
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override AS += -a64
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override LD += -m elf64ppc
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override CC += -m64
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endif
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export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
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new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
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ifeq ($(new_nm),y)
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NM := $(NM) --synthetic
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endif
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CHECKFLAGS += -m64 -D__powerpc__ -D__powerpc64__
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LDFLAGS := -m elf64ppc
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LDFLAGS_vmlinux := -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD)
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CFLAGS += -msoft-float -pipe -mminimal-toc -mtraceback=none \
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-mcall-aixdesc
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# Temporary hack until we have migrated to asm-powerpc
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CPPFLAGS += -Iarch/$(ARCH)/include
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GCC_VERSION := $(call cc-version)
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GCC_BROKEN_VEC := $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "y"; fi ;)
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ifeq ($(CONFIG_POWER4_ONLY),y)
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ifeq ($(CONFIG_ALTIVEC),y)
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ifeq ($(GCC_BROKEN_VEC),y)
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CFLAGS += $(call cc-option,-mcpu=970)
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else
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CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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CFLAGS += $(call cc-option,-mtune=power4)
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endif
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# Enable unit-at-a-time mode when possible. It shrinks the
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# kernel considerably.
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CFLAGS += $(call cc-option,-funit-at-a-time)
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head-y := arch/ppc64/kernel/head.o
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head-y += arch/powerpc/kernel/fpu.o
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libs-y += arch/ppc64/lib/
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core-y += arch/ppc64/kernel/ arch/powerpc/kernel/
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core-y += arch/powerpc/mm/
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core-y += arch/powerpc/sysdev/
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core-y += arch/powerpc/platforms/
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core-$(CONFIG_XMON) += arch/ppc64/xmon/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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boot := arch/ppc64/boot
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boottargets-$(CONFIG_PPC_PSERIES) += zImage zImage.initrd
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boottargets-$(CONFIG_PPC_PMAC) += zImage.vmode zImage.initrd.vmode
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boottargets-$(CONFIG_PPC_MAPLE) += zImage zImage.initrd
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boottargets-$(CONFIG_PPC_ISERIES) += vmlinux.sminitrd vmlinux.initrd vmlinux.sm
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boottargets-$(CONFIG_PPC_BPA) += zImage zImage.initrd
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$(boottargets-y): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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bootimage-$(CONFIG_PPC_PSERIES) := $(boot)/zImage
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bootimage-$(CONFIG_PPC_PMAC) := vmlinux
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bootimage-$(CONFIG_PPC_MAPLE) := $(boot)/zImage
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bootimage-$(CONFIG_PPC_BPA) := zImage
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bootimage-$(CONFIG_PPC_ISERIES) := vmlinux
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BOOTIMAGE := $(bootimage-y)
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install: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
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defaultimage-$(CONFIG_PPC_PSERIES) := zImage
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defaultimage-$(CONFIG_PPC_PMAC) := zImage.vmode
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defaultimage-$(CONFIG_PPC_MAPLE) := zImage
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defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
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KBUILD_IMAGE := $(defaultimage-y)
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all: $(KBUILD_IMAGE)
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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# Temporary hack until we have migrated to asm-powerpc
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$(Q)rm -rf arch/$(ARCH)/include
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# Temporary hack until we have migrated to asm-powerpc
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include/asm: arch/$(ARCH)/include/asm
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arch/$(ARCH)/include/asm:
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$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
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$(Q)ln -fsn $(srctree)/include/asm-powerpc arch/$(ARCH)/include/asm
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define archhelp
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echo ' zImage.vmode - Compressed kernel image (arch/$(ARCH)/boot/zImage.vmode)'
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echo ' zImage.initrd.vmode - Compressed kernel image with initrd attached,'
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echo ' sourced from arch/$(ARCH)/boot/ramdisk.image.gz'
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echo ' (arch/$(ARCH)/boot/zImage.initrd.vmode)'
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echo ' zImage - zImage for pSeries machines'
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echo ' zImage.initrd - zImage with initrd for pSeries machines'
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endef
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