192 lines
6.2 KiB
Diff
192 lines
6.2 KiB
Diff
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http://sourceware.org/ml/gdb-patches/2010-03/msg00799.html
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Subject: [patch] Fix separate-debug with non-unique section names (PR 11409)
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A different version was checked-in but they are interchangeable:
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http://sourceware.org/ml/gdb-patches/2010-03/msg00799.html
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http://sourceware.org/ml/gdb-cvs/2010-03/msg00241.html
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Hi,
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gdb-7.1 is now broken for example for debugging /usr/bin/emacs due to:
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http://sourceware.org/bugzilla/show_bug.cgi?id=11409
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[22] .data PROGBITS 00000000007fe8a0 1fe8a0 215068 00 WA 0 0 32
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[23] .data PROGBITS 0000000000a13920 413920 68c6e0 00 WA 0 0 32
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It is in fact a regression against gdb-7.0 by me due to:
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commit 71d0069a9f238a11f7f455bf6ad2adfc25683521
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Author: Jan Kratochvil <jan.kratochvil@redhat.com>
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Date: Tue Jan 5 15:51:01 2010 +0000
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gdb/
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* symfile.c (syms_from_objfile): Remove the !MAINLINE conditional.
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as while the code was broken even before the broken relocation was not applied
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to mainline binary (before PIE+OSX patches went in).
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No regressions on {x86_64,x86_64-m32,i686}-fedora12-linux-gnu.
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OK to check-in also for gdb-7.1 (7.1.1)?
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Thanks,
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Jan
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gdb/
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2010-03-23 Jan Kratochvil <jan.kratochvil@redhat.com>
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* symfile.c (addr_info_make_relative): Move sect declaration to the
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outer block. Initialize it to NULL. Prefer SECT->next more than
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bfd_get_section_by_name.
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gdb/testsuite/
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2010-03-23 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gdb.base/dup-sect.exp, gdb.base/dup-sect.S: New.
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--- a/gdb/symfile.c
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+++ b/gdb/symfile.c
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@@ -529,6 +529,7 @@ addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
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asection *lower_sect;
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CORE_ADDR lower_offset;
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int i;
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+ asection *sect;
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/* Find lowest loadable section to be used as starting point for
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continguous sections. FIXME!! won't work without call to find
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@@ -553,11 +554,23 @@ addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
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(the loadable section directly below it in memory).
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this_offset = lower_offset = lower_addr - lower_orig_addr */
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+ sect = NULL;
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for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
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{
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const char *sect_name = addrs->other[i].name;
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- asection *sect = bfd_get_section_by_name (abfd, sect_name);
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+ /* Prefer the next section of that we have found last. The separate
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+ debug info files have either the same section layout or just a few
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+ sections are missing there. On the other hand the section name is not
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+ unique and we could find an inappropraite section by its name. */
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+
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+ if (sect)
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+ sect = sect->next;
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+ if (sect && strcmp (sect_name, bfd_get_section_name (abfd, sect)) != 0)
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+ sect = NULL;
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+
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+ if (sect == NULL)
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+ sect = bfd_get_section_by_name (abfd, sect_name);
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if (sect)
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{
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/* This is the index used by BFD. */
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--- /dev/null
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+++ b/gdb/testsuite/gdb.base/dup-sect.S
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@@ -0,0 +1,22 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2010 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
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+
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+ .section sect1, "a"
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+var1: .byte 1
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+
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+ .section sect2, "a"
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+var2: .byte 2
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--- /dev/null
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+++ b/gdb/testsuite/gdb.base/dup-sect.exp
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@@ -0,0 +1,79 @@
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+# This testcase is part of GDB, the GNU debugger.
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+
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+# Copyright 2010 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+# Test inappropriate offseting of multiple sections with the same name.
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+# When kept in object file (before final executable link) it still works.
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+# When separate debug info file is not used it still works.
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+# When the ELF symbol table is kept in the main binary it still works.
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+# Used .S file as in .c file we would need __attriute__((section)) which is
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+# a GCC extension.
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+
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+# This test can only be run on targets which support ELF and use gas.
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+# For now pick a sampling of likely targets.
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+if {![istarget *-*-linux*]
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+ && ![istarget *-*-gnu*]
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+ && ![istarget *-*-elf*]
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+ && ![istarget arm-*-eabi*]
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+ && ![istarget powerpc-*-eabi*]} {
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+ return 0
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+}
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+
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+set testfile dup-sect
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+set srcfile ${testfile}.S
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+set srcmainfile start.c
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+set executable ${testfile}
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+set binfile ${objdir}/${subdir}/${executable}
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+
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+if {[build_executable ${testfile}.exp $executable [list ${srcfile} ${srcmainfile}] {}] == -1} {
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+ return -1
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+}
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+
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+set test "rename section"
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+set objcopy_program [transform objcopy]
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+set result [catch "exec $objcopy_program --rename-section sect2=sect1 $binfile" output]
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+verbose "result is $result"
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+verbose "output is $output"
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+if {$result != 0} {
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+ fail $test
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+ return
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+}
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+pass $test
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+
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+set test "split"
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+if {[gdb_gnu_strip_debug $binfile] != 0} {
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+ fail $test
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+} else {
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+ pass $test
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+}
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+
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+# gdb_gnu_strip_debug uses only --strip-debug and keeps the ELF symbol table
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+# in $binfile.
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+set test "strip"
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+set strip_program [transform strip]
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+set result [catch "exec $strip_program $binfile" output]
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+verbose "result is $result"
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+verbose "output is $output"
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+if {$result != 0} {
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+ fail $test
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+ return
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+}
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+pass $test
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+
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+clean_restart $executable
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+
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+gdb_test "p/d *(const char *) &var1" " = 1" "var1 after strip"
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+gdb_test "p/d *(const char *) &var2" " = 2" "var2 after strip"
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