144 lines
5.2 KiB
Diff
144 lines
5.2 KiB
Diff
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=185337
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2008-02-24 Jan Kratochvil <jan.kratochvil@redhat.com>
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Port to GDB-6.8pre.
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currently for trivial nonthreaded helloworld with no debug info up to -ggdb2 you
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will get:
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(gdb) p errno
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[some error]
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* with -ggdb2 and less "errno" in fact does not exist anywhere as it was
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compiled to "(*__errno_location ())" and the macro definition is not present.
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Unfortunately gdb will find the TLS symbol and it will try to access it but
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as the program has been compiled without -lpthread the TLS base register
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(%gs on i386) is not setup and it will result in:
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Cannot access memory at address 0x8
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Attached suggestion patch how to deal with the most common "errno" symbol
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for the most common under-ggdb3 compiled programs.
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Original patch hooked into target_translate_tls_address. But its inferior
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call invalidates `struct frame *' in the callers - RH BZ 690908.
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2007-11-03 Jan Kratochvil <jan.kratochvil@redhat.com>
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* ./gdb/dwarf2read.c (read_partial_die, dwarf2_linkage_name): Prefer
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DW_AT_MIPS_linkage_name over DW_AT_name now only for non-C.
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glibc-debuginfo-2.7-2.x86_64: /usr/lib/debug/lib64/libc.so.6.debug:
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<81a2> DW_AT_name : (indirect string, offset: 0x280e): __errno_location
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<81a8> DW_AT_MIPS_linkage_name: (indirect string, offset: 0x2808): *__GI___errno_location
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--- a/gdb/printcmd.c
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+++ b/gdb/printcmd.c
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@@ -967,6 +967,8 @@ print_command_1 (char *exp, int inspect, int voidprint)
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if (exp && *exp)
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{
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+ if (strcmp (exp, "errno") == 0)
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+ exp = "*((int *(*) (void)) __errno_location) ()";
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expr = parse_expression (exp);
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old_chain = make_cleanup (free_current_contents, &expr);
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cleanup = 1;
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Index: gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.c 2011-03-29 10:55:35.000000000 +0200
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@@ -0,0 +1,28 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2005, 2007 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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+ Please email any bugs, comments, and/or additions to this file to:
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+ bug-gdb@prep.ai.mit.edu */
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+
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+#include <errno.h>
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+
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+int main()
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+{
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+ errno = 42;
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+
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+ return 0; /* breakpoint */
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+}
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Index: gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.exp
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.exp 2011-03-29 10:55:35.000000000 +0200
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@@ -0,0 +1,60 @@
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+# Copyright 2007 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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+set testfile dw2-errno
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+set srcfile ${testfile}.c
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+set binfile ${objdir}/${subdir}/${testfile}
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+
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+proc prep {} {
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+ global srcdir subdir binfile
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+ gdb_exit
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+ gdb_start
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+ gdb_reinitialize_dir $srcdir/$subdir
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+ gdb_load ${binfile}
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+
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+ runto_main
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+
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+ gdb_breakpoint [gdb_get_line_number "breakpoint"]
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+ gdb_continue_to_breakpoint "breakpoint"
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+}
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+
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+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g2"] != "" } {
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+ untested "Couldn't compile test program"
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+ return -1
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+}
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+prep
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+gdb_test "print errno" ".* = 42" "errno with macros=N threads=N"
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+
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+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g3"] != "" } {
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+ untested "Couldn't compile test program"
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+ return -1
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+}
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+prep
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+gdb_test "print errno" ".* = 42" "errno with macros=Y threads=N"
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+
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+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g2"] != "" } {
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+ return -1
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+}
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+prep
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+gdb_test "print errno" ".* = 42" "errno with macros=N threads=Y"
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+
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+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g3"] != "" } {
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+ return -1
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+}
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+prep
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+gdb_test "print errno" ".* = 42" "errno with macros=Y threads=Y"
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+
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+# TODO: Test the error on resolving ERRNO with only libc loaded.
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+# Just how to find the current libc filename?
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