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authorCarmelo Amoroso <carmelo.amoroso@st.com>2012-01-03 19:09:56 +0100
committerCarmelo Amoroso <carmelo.amoroso@st.com>2012-01-13 12:22:59 +0100
commit4c9b7f3c21ff21c199e54bfad2fdf3445fa4573d (patch)
tree30d8a2f101cc1aa6e9b35273635fa9b3a6f2e1cf /libc
parenta7123b4744112deecb7aef771f224b680b4a02c0 (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>
Diffstat (limited to 'libc')
-rw-r--r--libc/signal/Makefile.in2
-rw-r--r--libc/stdlib/Makefile.in2
2 files changed, 4 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 \