Enable unwind info in libc-start.c and backtrace.c
Add unwind info to __libc_start_main so that unwinding continues one extra level to _start. Similarly add unwind info to backtrace. Given many targets require this, do this in a general way. * csu/Makefile: Add -funwind-tables to libc-start.c. * debug/Makefile: Add -funwind-tables to backtrace.c. * sysdeps/aarch64/Makefile: Remove CFLAGS-backtrace.c. * sysdeps/arm/Makefile: Likewise. * sysdeps/i386/Makefile: Likewise. * sysdeps/m68k/Makefile: Likewise. * sysdeps/mips/Makefile: Likewise. * sysdeps/nios2/Makefile: Likewise. * sysdeps/sh/Makefile: Likewise. * sysdeps/sparc/Makefile: Likewise.
This commit is contained in:
Wilco Dijkstra
parent
eb375def3d
commit
ca3a382ea3
13
ChangeLog
13
ChangeLog
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@ -1,3 +1,16 @@
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2017-09-19 Wilco Dijkstra <wdijkstr@arm.com>
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* csu/Makefile: Add -funwind-tables to libc-start.c.
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* debug/Makefile: Add -funwind-tables to backtrace.c.
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* sysdeps/aarch64/Makefile: Remove CFLAGS-backtrace.c.
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* sysdeps/arm/Makefile: Likewise.
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* sysdeps/i386/Makefile: Likewise.
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* sysdeps/m68k/Makefile: Likewise.
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* sysdeps/mips/Makefile: Likewise.
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* sysdeps/nios2/Makefile: Likewise.
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* sysdeps/sh/Makefile: Likewise.
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* sysdeps/sparc/Makefile: Likewise.
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2017-09-19 Joseph Myers <joseph@codesourcery.com>
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* benchtests/Makefile (bench-math): Add trunc and truncf.
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@ -82,6 +82,9 @@ extra-objs += $(crtstuff:=.o)
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extra-objs += abi-note.o init.o
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asm-CPPFLAGS += -I$(objpfx).
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# Enable unwinding so backtrace unwinds to __libc_start_main
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CFLAGS-libc-start.c += -funwind-tables
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include ../Rules
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# Make these in the lib pass so they're available in time to link things with.
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@ -63,7 +63,7 @@ elide-routines.o := stack_chk_fail_local
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CFLAGS-stack_chk_fail.c = $(no-stack-protector)
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CFLAGS-stack_chk_fail_local.c = $(no-stack-protector)
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CFLAGS-backtrace.c = -fno-omit-frame-pointer
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CFLAGS-backtrace.c = -fno-omit-frame-pointer -funwind-tables
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CFLAGS-sprintf_chk.c = $(libio-mtsafe)
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CFLAGS-snprintf_chk.c = $(libio-mtsafe)
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CFLAGS-vsprintf_chk.c = $(libio-mtsafe)
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@ -1,9 +1,5 @@
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long-double-fcts = yes
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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ifeq ($(subdir),elf)
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sysdep-dl-routines += tlsdesc dl-tlsdesc
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gen-as-const-headers += dl-link.sym
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@ -51,11 +51,6 @@ sysdep_routines += $(aeabi_constants) $(aeabi_routines)
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static-only-routines += $(aeabi_constants) aeabi_read_tp
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shared-only-routines += libc-aeabi_read_tp
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# In order for unwinding to fail when it falls out of main, we need a
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# cantunwind marker. There's one in start.S. To make sure we reach it, add
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# unwind tables for __libc_start_main.
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CFLAGS-libc-start.c += -fexceptions
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sysdep_routines += arm-unwind-resume
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shared-only-routines += arm-unwind-resume
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endif
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@ -64,10 +59,6 @@ ifeq ($(subdir),gmon)
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sysdep_routines += arm-mcount
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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ifeq ($(subdir),rt)
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librt-sysdep_routines += rt-aeabi_unwind_cpp_pr1 rt-arm-unwind-resume
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librt-shared-only-routines += rt-aeabi_unwind_cpp_pr1 rt-arm-unwind-resume
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@ -19,10 +19,6 @@ CFLAGS-dl-load.c += -Wno-unused
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CFLAGS-dl-reloc.c += -Wno-unused
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -fexceptions
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endif
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# Most of the glibc routines don't ever call user defined callbacks
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# nor use any FPU or SSE* and as such don't need bigger %esp alignment
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# than 4 bytes.
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@ -40,10 +40,6 @@ ifeq ($(subdir),setjmp)
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CFLAGS-setjmp.c := -fno-omit-frame-pointer
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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ifeq ($(subdir),elf)
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CFLAGS-rtld.c += -Wno-uninitialized -Wno-unused
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endif
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@ -12,10 +12,6 @@ librt-sysdep_routines += rt-sysdep
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librt-shared-only-routines += rt-sysdep
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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ifeq ($(subdir),csu)
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CPPFLAGS-crti.S += $(pic-ccflag)
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CPPFLAGS-crtn.S += $(pic-ccflag)
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@ -29,7 +29,3 @@ endif
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ifeq ($(subdir),csu)
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gen-as-const-headers += tcb-offsets.sym
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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@ -5,7 +5,3 @@ endif
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ifeq ($(subdir),gmon)
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sysdep_routines += _mcount
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endif
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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@ -3,10 +3,6 @@ long-double-fcts = yes
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pie-ccflag = -fPIE
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ifeq ($(subdir),debug)
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CFLAGS-backtrace.c += -funwind-tables
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endif
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ifeq ($(subdir),gmon)
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sysdep_routines += sparc-mcount
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endif
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