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Enable unwind info in libc-start.c and backtrace.c

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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 2017-09-14 12:47:35 +01:00
parent eb375def3d
commit ca3a382ea3
11 changed files with 17 additions and 38 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2017-09-19 Wilco Dijkstra <wdijkstr@arm.com>
* 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.
2017-09-19 Joseph Myers <joseph@codesourcery.com>
* benchtests/Makefile (bench-math): Add trunc and truncf.

3
csu/Makefile
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@ -82,6 +82,9 @@ extra-objs += $(crtstuff:=.o)
extra-objs += abi-note.o init.o
asm-CPPFLAGS += -I$(objpfx).
# Enable unwinding so backtrace unwinds to __libc_start_main
CFLAGS-libc-start.c += -funwind-tables
include ../Rules
# Make these in the lib pass so they're available in time to link things with.

2
debug/Makefile
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@ -63,7 +63,7 @@ elide-routines.o := stack_chk_fail_local
CFLAGS-stack_chk_fail.c = $(no-stack-protector)
CFLAGS-stack_chk_fail_local.c = $(no-stack-protector)
CFLAGS-backtrace.c = -fno-omit-frame-pointer
CFLAGS-backtrace.c = -fno-omit-frame-pointer -funwind-tables
CFLAGS-sprintf_chk.c = $(libio-mtsafe)
CFLAGS-snprintf_chk.c = $(libio-mtsafe)
CFLAGS-vsprintf_chk.c = $(libio-mtsafe)

4
sysdeps/aarch64/Makefile
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@ -1,9 +1,5 @@
long-double-fcts = yes
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif
ifeq ($(subdir),elf)
sysdep-dl-routines += tlsdesc dl-tlsdesc
gen-as-const-headers += dl-link.sym

9
sysdeps/arm/Makefile
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@ -51,11 +51,6 @@ sysdep_routines += $(aeabi_constants) $(aeabi_routines)
static-only-routines += $(aeabi_constants) aeabi_read_tp
shared-only-routines += libc-aeabi_read_tp
# In order for unwinding to fail when it falls out of main, we need a
# cantunwind marker. There's one in start.S. To make sure we reach it, add
# unwind tables for __libc_start_main.
CFLAGS-libc-start.c += -fexceptions
sysdep_routines += arm-unwind-resume
shared-only-routines += arm-unwind-resume
endif
@ -64,10 +59,6 @@ ifeq ($(subdir),gmon)
sysdep_routines += arm-mcount
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif
ifeq ($(subdir),rt)
librt-sysdep_routines += rt-aeabi_unwind_cpp_pr1 rt-arm-unwind-resume
librt-shared-only-routines += rt-aeabi_unwind_cpp_pr1 rt-arm-unwind-resume

4
sysdeps/i386/Makefile
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@ -19,10 +19,6 @@ CFLAGS-dl-load.c += -Wno-unused
CFLAGS-dl-reloc.c += -Wno-unused
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -fexceptions
endif
# Most of the glibc routines don't ever call user defined callbacks
# nor use any FPU or SSE* and as such don't need bigger %esp alignment
# than 4 bytes.

4
sysdeps/m68k/Makefile
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@ -40,10 +40,6 @@ ifeq ($(subdir),setjmp)
CFLAGS-setjmp.c := -fno-omit-frame-pointer
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif
ifeq ($(subdir),elf)
CFLAGS-rtld.c += -Wno-uninitialized -Wno-unused
endif

4
sysdeps/mips/Makefile
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@ -12,10 +12,6 @@ librt-sysdep_routines += rt-sysdep
librt-shared-only-routines += rt-sysdep
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif
ifeq ($(subdir),csu)
CPPFLAGS-crti.S += $(pic-ccflag)
CPPFLAGS-crtn.S += $(pic-ccflag)

4
sysdeps/nios2/Makefile
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@ -29,7 +29,3 @@ endif
ifeq ($(subdir),csu)
gen-as-const-headers += tcb-offsets.sym
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif

4
sysdeps/sh/Makefile
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@ -5,7 +5,3 @@ endif
ifeq ($(subdir),gmon)
sysdep_routines += _mcount
endif
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif

4
sysdeps/sparc/Makefile
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@ -3,10 +3,6 @@ long-double-fcts = yes
pie-ccflag = -fPIE
ifeq ($(subdir),debug)
CFLAGS-backtrace.c += -funwind-tables
endif
ifeq ($(subdir),gmon)
sysdep_routines += sparc-mcount
endif