mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-14 06:35:12 +00:00
d8de756573
New compilers use the floating-point registers as spill registers when
there is high register pressure. In the purgatory however, the afp control
bit is not set. This leads to an exception whenever a floating-point
instruction is used, which again causes an interrupt loop.
Forbid the compiler to use floating-point instructions by adding
-msoft-float to KBUILD_CFLAGS.
Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Fixes: 840798a1f5 (s390/kexec_file: Add purgatory)
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
37 lines
1.2 KiB
Makefile
37 lines
1.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
OBJECT_FILES_NON_STANDARD := y
|
|
|
|
purgatory-y := head.o purgatory.o string.o sha256.o mem.o
|
|
|
|
targets += $(purgatory-y) purgatory.ro kexec-purgatory.c
|
|
PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
|
|
|
|
$(obj)/sha256.o: $(srctree)/lib/sha256.c
|
|
$(call if_changed_rule,cc_o_c)
|
|
|
|
$(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S
|
|
$(call if_changed_rule,as_o_S)
|
|
|
|
$(obj)/string.o: $(srctree)/arch/s390/lib/string.c
|
|
$(call if_changed_rule,cc_o_c)
|
|
|
|
LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib
|
|
LDFLAGS_purgatory.ro += -z nodefaultlib
|
|
KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
|
|
KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
|
|
KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
|
|
KBUILD_CFLAGS += -c -MD -Os -m64 -msoft-float
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
|
|
|
|
$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
|
|
$(call if_changed,ld)
|
|
|
|
CMD_BIN2C = $(objtree)/scripts/basic/bin2c
|
|
quiet_cmd_bin2c = BIN2C $@
|
|
cmd_bin2c = $(CMD_BIN2C) kexec_purgatory < $< > $@
|
|
|
|
$(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
|
|
$(call if_changed,bin2c)
|
|
|
|
obj-$(CONFIG_ARCH_HAS_KEXEC_PURGATORY) += kexec-purgatory.o
|