From 900fa2573671d692ed245f76aa3f05cec462be0c Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Wed, 6 Apr 2022 12:09:42 -0300 Subject: stdio: Remove the usage of $(fno-unit-at-a-time) for errlist.c The errlist.c is built with -fno-toplevel-reorder to avoid compiler to reorder the compat assembly directives due an assembler issue [1] (fixed on 2.39). This patch removes the compiler flags by split the compat symbol generation in two phases. First the _sys_errlist_internal internal without any compat symbol directive is preprocessed to generate an assembly source code. This generate assembly is then used as input on a platform agnostic errlist-data.S which then creates the compat definitions. This prevents compiler to move any compat directive prior the _sys_errlist_internal definition itself. Checked on a make check run-built-tests=no on all affected ABIs. [1] https://sourceware.org/bugzilla/show_bug.cgi?id=29012 --- stdio-common/Makefile | 20 +++++++++++++++++++- stdio-common/err_map.h | 24 ++++++++++++++++++++++++ stdio-common/errlist-compat-data.h | 1 + stdio-common/errlist-compat.c | 1 - stdio-common/errlist-data-gen.c | 34 ++++++++++++++++++++++++++++++++++ stdio-common/errlist-data.S | 7 +++++++ stdio-common/errlist.c | 20 ++++---------------- 7 files changed, 89 insertions(+), 18 deletions(-) create mode 100644 stdio-common/err_map.h create mode 100644 stdio-common/errlist-compat-data.h delete mode 100644 stdio-common/errlist-compat.c create mode 100644 stdio-common/errlist-data-gen.c create mode 100644 stdio-common/errlist-data.S (limited to 'stdio-common') diff --git a/stdio-common/Makefile b/stdio-common/Makefile index a1603e82fe..08bc998436 100644 --- a/stdio-common/Makefile +++ b/stdio-common/Makefile @@ -88,6 +88,7 @@ routines := \ aux := \ errlist \ + errlist-data \ errname \ fxprintf \ printf-parsemb \ @@ -211,6 +212,10 @@ tests := \ xbug \ # tests +generated += \ + errlist-data-aux-shared.S \ + errlist-data-aux.S \ + # generated test-srcs = tst-unbputc tst-printf tst-printfsz-islongdouble @@ -246,6 +251,20 @@ tests-special += $(objpfx)tst-errno-manual.out include ../Rules +# The errlist.c is built in two phases because compiler might reorder the +# compat_symbol directive prior the object itself and on binutils older +# than 2.29 it might generate object sizes different than the expected ones. +$(objpfx)errlist-data-aux-shared.S: errlist-data-gen.c + $(make-target-directory) + $(compile-command.c) $(pic-cppflags) $(pic-ccflag) $(no-stack-protector) -S + +$(objpfx)errlist-data-aux.S: errlist-data-gen.c + $(make-target-directory) + $(compile-command.c) $(pie-default) $(no-stack-protector) -S + +$(objpfx)errlist-data.os: $(objpfx)errlist-data-aux-shared.S +$(objpfx)errlist-data.o: $(objpfx)errlist-data-aux.S + ifeq ($(run-built-tests),yes) LOCALES := \ de_DE.ISO-8859-1 \ @@ -334,7 +353,6 @@ CFLAGS-isoc99_vfscanf.c += -fexceptions CFLAGS-isoc99_vscanf.c += -fexceptions CFLAGS-isoc99_fscanf.c += -fexceptions CFLAGS-isoc99_scanf.c += -fexceptions -CFLAGS-errlist.c += $(fno-unit-at-a-time) CFLAGS-siglist.c += $(fno-unit-at-a-time) # scanf14a.c and scanf16a.c test a deprecated extension which is no diff --git a/stdio-common/err_map.h b/stdio-common/err_map.h new file mode 100644 index 0000000000..6cc3aa3375 --- /dev/null +++ b/stdio-common/err_map.h @@ -0,0 +1,24 @@ +/* Internal errno names mapping definition. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _ERR_MAP_H +#define _ERR_MAP_H + +#define ERR_MAP(n) (n) + +#endif diff --git a/stdio-common/errlist-compat-data.h b/stdio-common/errlist-compat-data.h new file mode 100644 index 0000000000..7c89c9a5a4 --- /dev/null +++ b/stdio-common/errlist-compat-data.h @@ -0,0 +1 @@ +/* Empty */ diff --git a/stdio-common/errlist-compat.c b/stdio-common/errlist-compat.c deleted file mode 100644 index 6e25b021ab..0000000000 --- a/stdio-common/errlist-compat.c +++ /dev/null @@ -1 +0,0 @@ -/* Empty. */ diff --git a/stdio-common/errlist-data-gen.c b/stdio-common/errlist-data-gen.c new file mode 100644 index 0000000000..db4f50e6db --- /dev/null +++ b/stdio-common/errlist-data-gen.c @@ -0,0 +1,34 @@ +/* Internal errno names mapping definition. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include + +const char *const _sys_errlist_internal[] = + { +#define _S(n, str) [ERR_MAP(n)] = str, +#include +#undef _S + }; +const size_t _sys_errlist_internal_len = array_length (_sys_errlist_internal); + +/* Include to get the definitions for sys_nerr/_sys_nerr. */ +#include diff --git a/stdio-common/errlist-data.S b/stdio-common/errlist-data.S new file mode 100644 index 0000000000..870b3f40c9 --- /dev/null +++ b/stdio-common/errlist-data.S @@ -0,0 +1,7 @@ +#ifdef SHARED +# include "errlist-data-aux-shared.S" +#else +# include "errlist-data-aux.S" +#endif + +#include diff --git a/stdio-common/errlist.c b/stdio-common/errlist.c index 1c09a31a7a..4c0a0a218d 100644 --- a/stdio-common/errlist.c +++ b/stdio-common/errlist.c @@ -16,29 +16,17 @@ License along with the GNU C Library; if not, see . */ -#include +#include +#include #include #include -#include - -#ifndef ERR_MAP -# define ERR_MAP(n) n -#endif - -const char *const _sys_errlist_internal[] = - { -#define _S(n, str) [ERR_MAP(n)] = str, -#include -#undef _S - }; +#include const char * __get_errlist (int errnum) { int mapped = ERR_MAP (errnum); - if (mapped >= 0 && mapped < array_length (_sys_errlist_internal)) + if (mapped >= 0 && mapped < _sys_errlist_internal_len) return _sys_errlist_internal[mapped]; return NULL; } - -#include -- cgit 1.4.1