Commit 10f70525 authored by Jens Remus's avatar Jens Remus Committed by Alexander Gordeev
Browse files

s390/vdso: Generate unwind information for C modules 



GDB fails to unwind vDSO functions with error message "PC not saved",
for instance when stepping through gettimeofday().

Add -fasynchronous-unwind-tables to CFLAGS to generate .eh_frame
DWARF unwind information for the vDSO C modules.

Fixes: 4bff8cb5 ("s390: convert to GENERIC_VDSO")
Signed-off-by: default avatarJens Remus <jremus@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent 712c5d5f

arch/s390/kernel/vdso32/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -20,7 +20,8 @@ KBUILD_AFLAGS_32 += -m31 -s 


KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))

KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32))

KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin

KBUILD_CFLAGS_32 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_32))

KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin -fasynchronous-unwind-tables



LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \

	--hash-style=both --build-id=sha1 -melf_s390 -T

arch/s390/kernel/vdso64/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -26,7 +26,8 @@ KBUILD_AFLAGS_64 += -m64 
KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))

KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64))

KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64))

KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin

KBUILD_CFLAGS_64 := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_64))

KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables

ldflags-y := -shared -soname=linux-vdso64.so.1 \

	     --hash-style=both --build-id=sha1 -T