686140a1a9
Implement CPU alternatives, which allows to optionally patch newer instructions at runtime, based on CPU facilities availability. A new kernel boot parameter "noaltinstr" disables patching. Current implementation is derived from x86 alternatives. Although ideal instructions padding (when altinstr is longer then oldinstr) is added at compile time, and no oldinstr nops optimization has to be done at runtime. Also couple of compile time sanity checks are done: 1. oldinstr and altinstr must be <= 254 bytes long, 2. oldinstr and altinstr must not have an odd length. alternative(oldinstr, altinstr, facility); alternative_2(oldinstr, altinstr1, facility1, altinstr2, facility2); Both compile time and runtime padding consists of either 6/4/2 bytes nop or a jump (brcl) + 2 bytes nop filler if padding is longer then 6 bytes. .altinstructions and .altinstr_replacement sections are part of __init_begin : __init_end region and are freed after initialization. Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
89 lines
2.5 KiB
Makefile
89 lines
2.5 KiB
Makefile
#
|
|
# Makefile for the linux kernel.
|
|
#
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
|
|
# Do not trace tracer code
|
|
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
|
|
|
|
# Do not trace early setup code
|
|
CFLAGS_REMOVE_als.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_REMOVE_early.o = $(CC_FLAGS_FTRACE)
|
|
|
|
endif
|
|
|
|
GCOV_PROFILE_als.o := n
|
|
GCOV_PROFILE_early.o := n
|
|
|
|
KCOV_INSTRUMENT_als.o := n
|
|
KCOV_INSTRUMENT_early.o := n
|
|
|
|
UBSAN_SANITIZE_als.o := n
|
|
UBSAN_SANITIZE_early.o := n
|
|
|
|
#
|
|
# Use -march=z900 for als.c to be able to print an error
|
|
# message if the kernel is started on a machine which is too old
|
|
#
|
|
ifneq ($(CC_FLAGS_MARCH),-march=z900)
|
|
CFLAGS_REMOVE_als.o += $(CC_FLAGS_MARCH)
|
|
CFLAGS_als.o += -march=z900
|
|
AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH)
|
|
AFLAGS_head.o += -march=z900
|
|
endif
|
|
|
|
CFLAGS_als.o += -D__NO_FORTIFY
|
|
|
|
#
|
|
# Passing null pointers is ok for smp code, since we access the lowcore here.
|
|
#
|
|
CFLAGS_smp.o := -Wno-nonnull
|
|
|
|
#
|
|
# Disable tailcall optimizations for stack / callchain walking functions
|
|
# since this might generate broken code when accessing register 15 and
|
|
# passing its content to other functions.
|
|
#
|
|
CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
|
|
CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
|
|
|
|
#
|
|
# Pass UTS_MACHINE for user_regset definition
|
|
#
|
|
CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
|
|
|
|
obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
|
|
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
|
|
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
|
|
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
|
|
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
|
|
obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o
|
|
|
|
extra-y += head.o head64.o vmlinux.lds
|
|
|
|
obj-$(CONFIG_MODULES) += module.o
|
|
obj-$(CONFIG_SMP) += smp.o
|
|
obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o
|
|
obj-$(CONFIG_HIBERNATION) += suspend.o swsusp.o
|
|
obj-$(CONFIG_AUDIT) += audit.o
|
|
compat-obj-$(CONFIG_AUDIT) += compat_audit.o
|
|
obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o
|
|
obj-$(CONFIG_COMPAT) += compat_wrapper.o $(compat-obj-y)
|
|
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
|
|
obj-$(CONFIG_STACKTRACE) += stacktrace.o
|
|
obj-$(CONFIG_KPROBES) += kprobes.o
|
|
obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
|
|
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
|
|
obj-$(CONFIG_UPROBES) += uprobes.o
|
|
obj-$(CONFIG_ALTERNATIVES) += alternative.o
|
|
|
|
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o
|
|
obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o
|
|
|
|
obj-$(CONFIG_TRACEPOINTS) += trace.o
|
|
|
|
# vdso
|
|
obj-y += vdso64/
|
|
obj-$(CONFIG_COMPAT) += vdso32/
|