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Wrapping the _start function with ENTRY and END to insert ENDBR32 at function entry when CET is enabled. Since _start now includes CFI, without "cfi_undefined (eip)", unwinder may not terminate at _start and we will get Program received signal SIGSEGV, Segmentation fault. 0xf7dc661e in ?? () from /lib/libgcc_s.so.1 Missing separate debuginfos, use: dnf debuginfo-install libgcc-8.2.1-3.0.fc28.i686 (gdb) bt #0 0xf7dc661e in ?? () from /lib/libgcc_s.so.1 #1 0xf7dc7c18 in _Unwind_Backtrace () from /lib/libgcc_s.so.1 #2 0xf7f0d809 in __GI___backtrace (array=array@entry=0xffffc7d0, size=size@entry=20) at ../sysdeps/i386/backtrace.c:127 #3 0x08049254 in compare (p1=p1@entry=0xffffcad0, p2=p2@entry=0xffffcad4) at backtrace-tst.c:12 #4 0xf7e2a28c in msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=2) at msort.c:65 #5 0xf7e29f64 in msort_with_tmp (n=2, b=0xffffcad0, p=0xffffca5c) at msort.c:53 #6 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=5) at msort.c:53 #7 0xf7e29f64 in msort_with_tmp (n=5, b=0xffffcad0, p=0xffffca5c) at msort.c:53 #8 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=10) at msort.c:53 #9 0xf7e29f64 in msort_with_tmp (n=10, b=0xffffcad0, p=0xffffca5c) at msort.c:53 #10 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=20) at msort.c:53 #11 0xf7e2a5b6 in msort_with_tmp (n=20, b=0xffffcad0, p=0xffffca5c) at msort.c:297 #12 __GI___qsort_r (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4, cmp=cmp@entry=0x8049230 <compare>, arg=arg@entry=0x0) at msort.c:297 #13 0xf7e2a84d in __GI_qsort (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4, cmp=cmp@entry=0x8049230 <compare>) at msort.c:308 #14 0x080490f6 in main (argc=2, argv=0xffffcbd4) at backtrace-tst.c:39 FAIL: debug/backtrace-tst [BZ #23606] * sysdeps/i386/start.S: Include <sysdep.h> (_start): Use ENTRY/END to insert ENDBR32 at entry when CET is enabled. Add cfi_undefined (eip). Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
This directory contains the sources of the GNU C Library. See the file "version.h" for what release version you have. The GNU C Library is the standard system C library for all GNU systems, and is an important part of what makes up a GNU system. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective C; the runtime facilities of other programming languages use the C library to access the underlying operating system. In GNU/Linux systems, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd systems, it works with a microkernel and Hurd servers. The GNU C Library implements much of the POSIX.1 functionality in the GNU/Hurd system, using configurations i[4567]86-*-gnu. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 3.2 or later. Also note that the shared version of the libgcc_s library must be installed for the pthread library to work correctly. The GNU C Library supports these configurations for using Linux kernels: aarch64*-*-linux-gnu alpha*-*-linux-gnu arm-*-linux-gnueabi hppa-*-linux-gnu i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 ia64-*-linux-gnu m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-linux-gnu powerpc-*-linux-gnu Hardware or software floating point, BE only. powerpc64*-*-linux-gnu Big-endian and little-endian. s390-*-linux-gnu s390x-*-linux-gnu riscv64-*-linux-gnu sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see http://www.gnu.org/software/libc/ for more information. See the file INSTALL to find out how to configure, build, and install the GNU C Library. You might also consider reading the WWW pages for the C library at http://www.gnu.org/software/libc/. The GNU C Library is (almost) completely documented by the Texinfo manual found in the `manual/' subdirectory. The manual is still being updated and contains some known errors and omissions; we regret that we do not have the resources to work on the manual as much as we would like. For corrections to the manual, please file a bug in the `manual' component, following the bug-reporting instructions below. Please be sure to check the manual in the current development sources to see if your problem has already been corrected. Please see http://www.gnu.org/software/libc/bugs.html for bug reporting information. We are now using the Bugzilla system to track all bug reports. This web page gives detailed information on how to report bugs properly. The GNU C Library is free software. See the file COPYING.LIB for copying conditions, and LICENSES for notices about a few contributions that require these additional notices to be distributed. License copyright years may be listed using range notation, e.g., 1996-2015, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.