1bca09f714
dumpstack() did not always print a sane callchain when being called. The reason is that show_trace() accessed register 15 directly to get the current stack pointer and passed that pointer to __show_trace() which expects a valid stack frame pointer as argument. However due to tail call optimization the stack frame may not exist anymore when __show_trace() gets called and therefore an invalid stack frame pointer gets passed. To prevent that disable tail call optimization for call chain walking functions. So move all the show_* functions to a dumpstack.c file like other architectures have it already and add a -fno-optimize-sibling-calls compile flag to both dumpstack.c and stacktrace.c to prevent tail call optimization. Fixes callchains that looked e.g. like this: [ 12.868258] Call Trace: [ 12.868262] ([<0000000000008000>] 0x8000) Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
70 lines
2.2 KiB
Makefile
70 lines
2.2 KiB
Makefile
#
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# Makefile for the linux kernel.
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#
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ifdef CONFIG_FUNCTION_TRACER
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# Don't trace early setup code and tracing code
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CFLAGS_REMOVE_early.o = -pg
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CFLAGS_REMOVE_ftrace.o = -pg
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endif
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#
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# Passing null pointers is ok for smp code, since we access the lowcore here.
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#
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CFLAGS_smp.o := -Wno-nonnull
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#
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# Disable tailcall optimizations for stack / callchain walking functions
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# since this might generate broken code when accessing register 15 and
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# passing its content to other functions.
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#
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CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
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CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
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#
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# Pass UTS_MACHINE for user_regset definition
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#
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CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
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CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
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obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o
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obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
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obj-y += debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o
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obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
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obj-y += dumpstack.o
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obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
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obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
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obj-y += $(if $(CONFIG_64BIT),relocate_kernel64.o,relocate_kernel.o)
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extra-y += head.o vmlinux.lds
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extra-y += $(if $(CONFIG_64BIT),head64.o,head31.o)
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obj-$(CONFIG_MODULES) += s390_ksyms.o module.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SCHED_BOOK) += topology.o
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obj-$(CONFIG_HIBERNATION) += suspend.o swsusp_asm64.o
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obj-$(CONFIG_AUDIT) += audit.o
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compat-obj-$(CONFIG_AUDIT) += compat_audit.o
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obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o \
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compat_wrapper.o compat_exec_domain.o \
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$(compat-obj-y)
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_FUNCTION_TRACER) += $(if $(CONFIG_64BIT),mcount64.o,mcount.o)
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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ifdef CONFIG_64BIT
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o
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obj-y += runtime_instr.o cache.o
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endif
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# vdso
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obj-$(CONFIG_64BIT) += vdso64/
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obj-$(CONFIG_32BIT) += vdso32/
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obj-$(CONFIG_COMPAT) += vdso32/
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