diff options
| author | Carmelo Amoroso <carmelo.amoroso@st.com> | 2012-01-03 19:09:56 +0100 |
|---|---|---|
| committer | Carmelo Amoroso <carmelo.amoroso@st.com> | 2012-01-13 12:22:59 +0100 |
| commit | 4c9b7f3c21ff21c199e54bfad2fdf3445fa4573d (patch) | |
| tree | 30d8a2f101cc1aa6e9b35273635fa9b3a6f2e1cf | |
| parent | a7123b4744112deecb7aef771f224b680b4a02c0 (diff) | |
libc: allow to backtrace out of abort call
Build raise and abort function with dwarf2 info by using
-fasynchronous-unwind-tables to make backtrace() working across a
call to abort.
A scenario where it could be useful is within a signal handler that
wants to dump a backtrace when catching some signal (i.e SIGABRT).
Without having abort & raise built with DWARF2 information, it is not
possible for the libgcc stack unwinder to walk through the call stack
out of the abort/raise function.
Impacts in terms of size are really limited
Current
text data bss dec hex filename
164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os
164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS
220 24 4 248 f8 ./libc/stdlib/abort.os
With (-fasynchronous-unwind-tables)
text data bss dec hex filename
216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os
216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS
280 24 4 308 134 ./libc/stdlib/abort.os
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Acked-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
| -rw-r--r-- | libc/signal/Makefile.in | 2 | ||||
| -rw-r--r-- | libc/stdlib/Makefile.in | 2 | ||||
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch | 2 |
3 files changed, 6 insertions, 0 deletions
diff --git a/libc/signal/Makefile.in b/libc/signal/Makefile.in index a7e307871..ed8598b07 100644 --- a/libc/signal/Makefile.in +++ b/libc/signal/Makefile.in @@ -24,6 +24,8 @@ ifneq ($(strip $(ARCH_OBJS)),) CSRC-y := $(filter-out $(notdir $(ARCH_OBJS:.o=.c)),$(CSRC-y)) endif +CFLAGS-raise.c = -fasynchronous-unwind-tables + SIGNAL_DIR := $(top_srcdir)libc/signal SIGNAL_OUT := $(top_builddir)libc/signal diff --git a/libc/stdlib/Makefile.in b/libc/stdlib/Makefile.in index 73e5462f6..9e96f03bb 100644 --- a/libc/stdlib/Makefile.in +++ b/libc/stdlib/Makefile.in @@ -27,6 +27,8 @@ CSRC-$(if $(findstring yy,$(UCLIBC_HAS_FLOATS)$(UCLIBC_SUSV3_LEGACY)),y) += \ gcvt.c CSRC-$(UCLIBC_SUSV3_LEGACY) += mktemp.c +CFLAGS-abort.c = -fasynchronous-unwind-tables + # multi source stdlib.c CSRC-y += abs.c labs.c atoi.c atol.c strtol.c strtoul.c _stdlib_strto_l.c \ qsort.c qsort_r.c bsearch.c \ diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch index e28cec247..b32bc9b5e 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch @@ -128,6 +128,8 @@ CFLAGS-timer_gettime.c = -I$(top_srcdir)librt -DIS_IN_librt CFLAGS-timer_routines.c = -I$(top_srcdir)librt -DIS_IN_librt CFLAGS-timer_settime.c = -I$(top_srcdir)librt -DIS_IN_librt +CFLAGS-raise.c = -fasynchronous-unwind-tables + CFLAGS-linux = -DNOT_IN_libc -DIS_IN_libpthread $(SSP_ALL_CFLAGS) CFLAGS-OMIT-libc_pthread_init.c = -DNOT_IN_libc -DIS_IN_libpthread |