e27f41ba2b
Add <bits/indirect-return.h> and include it in <ucontext.h>. __INDIRECT_RETURN defined in <bits/indirect-return.h> indicates if swapcontext requires special compiler treatment. The default __INDIRECT_RETURN is empty. On x86, when shadow stack is enabled, __INDIRECT_RETURN is defined with indirect_return attribute, which has been added to GCC 9, to indicate that swapcontext returns via indirect branch. Otherwise __INDIRECT_RETURN is defined with returns_twice attribute. When shadow stack is enabled, remove always_inline attribute from prepare_test_buffer in string/tst-xbzero-opt.c to avoid: tst-xbzero-opt.c: In function ‘prepare_test_buffer’: tst-xbzero-opt.c:105:1: error: function ‘prepare_test_buffer’ can never be inlined because it uses setjmp prepare_test_buffer (unsigned char *buf) when indirect_return attribute isn't available. Reviewed-by: Carlos O'Donell <carlos@redhat.com> * bits/indirect-return.h: New file. * misc/sys/cdefs.h (__glibc_has_attribute): New. * sysdeps/x86/bits/indirect-return.h: Likewise. * stdlib/Makefile (headers): Add bits/indirect-return.h. * stdlib/ucontext.h: Include <bits/indirect-return.h>. (swapcontext): Add __INDIRECT_RETURN. * string/tst-xbzero-opt.c (ALWAYS_INLINE): New. (prepare_test_buffer): Use it. |
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| .. | ||
| types | ||
| byteswap.h | ||
| confname.h | ||
| dirent.h | ||
| dlfcn.h | ||
| elfclass.h | ||
| endian.h | ||
| environments.h | ||
| errno.h | ||
| fcntl.h | ||
| fenv.h | ||
| fenvinline.h | ||
| floatn-common.h | ||
| floatn.h | ||
| flt-eval-method.h | ||
| fp-fast.h | ||
| fp-logb.h | ||
| hwcap.h | ||
| in.h | ||
| indirect-return.h | ||
| ioctl-types.h | ||
| ioctls.h | ||
| ipc.h | ||
| ipctypes.h | ||
| iscanonical.h | ||
| libc-header-start.h | ||
| libm-simd-decl-stubs.h | ||
| link.h | ||
| local_lim.h | ||
| long-double.h | ||
| math-vector.h | ||
| mathdef.h | ||
| mathinline.h | ||
| mman.h | ||
| mqueue.h | ||
| msq.h | ||
| netdb.h | ||
| param.h | ||
| poll.h | ||
| posix_opt.h | ||
| pthreadtypes.h | ||
| resource.h | ||
| sched.h | ||
| select.h | ||
| sem.h | ||
| setjmp.h | ||
| shm.h | ||
| sigaction.h | ||
| sigcontext.h | ||
| sigevent-consts.h | ||
| siginfo-consts.h | ||
| signum-generic.h | ||
| signum.h | ||
| sigstack.h | ||
| sigthread.h | ||
| sockaddr.h | ||
| socket.h | ||
| ss_flags.h | ||
| stat.h | ||
| statfs.h | ||
| statvfs.h | ||
| stdint-intn.h | ||
| stdint-uintn.h | ||
| stdlib-bsearch.h | ||
| stropts.h | ||
| sys_errlist.h | ||
| syslog-path.h | ||
| sysmacros.h | ||
| termios.h | ||
| time.h | ||
| typesizes.h | ||
| uintn-identity.h | ||
| uio_lim.h | ||
| uio-ext.h | ||
| utmp.h | ||
| utsname.h | ||
| waitflags.h | ||
| waitstatus.h | ||
| wchar.h | ||
| wordsize.h | ||
| xtitypes.h | ||