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3a58abaf AM |
1 | https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=185337 |
2 | ||
3 | 2008-02-24 Jan Kratochvil <jan.kratochvil@redhat.com> | |
4 | ||
5 | Port to GDB-6.8pre. | |
6 | ||
7 | currently for trivial nonthreaded helloworld with no debug info up to -ggdb2 you | |
8 | will get: | |
9 | (gdb) p errno | |
10 | [some error] | |
11 | ||
12 | * with -ggdb2 and less "errno" in fact does not exist anywhere as it was | |
13 | compiled to "(*__errno_location ())" and the macro definition is not present. | |
14 | Unfortunately gdb will find the TLS symbol and it will try to access it but | |
15 | as the program has been compiled without -lpthread the TLS base register | |
16 | (%gs on i386) is not setup and it will result in: | |
17 | Cannot access memory at address 0x8 | |
18 | ||
19 | Attached suggestion patch how to deal with the most common "errno" symbol | |
20 | for the most common under-ggdb3 compiled programs. | |
21 | ||
e5178960 PS |
22 | Original patch hooked into target_translate_tls_address. But its inferior |
23 | call invalidates `struct frame *' in the callers - RH BZ 690908. | |
3a58abaf AM |
24 | |
25 | ||
26 | 2007-11-03 Jan Kratochvil <jan.kratochvil@redhat.com> | |
27 | ||
28 | * ./gdb/dwarf2read.c (read_partial_die, dwarf2_linkage_name): Prefer | |
29 | DW_AT_MIPS_linkage_name over DW_AT_name now only for non-C. | |
30 | ||
31 | glibc-debuginfo-2.7-2.x86_64: /usr/lib/debug/lib64/libc.so.6.debug: | |
32 | <81a2> DW_AT_name : (indirect string, offset: 0x280e): __errno_location | |
33 | <81a8> DW_AT_MIPS_linkage_name: (indirect string, offset: 0x2808): *__GI___errno_location | |
34 | ||
6ed6bacf AM |
35 | --- a/gdb/printcmd.c |
36 | +++ b/gdb/printcmd.c | |
37 | @@ -967,6 +967,8 @@ print_command_1 (char *exp, int inspect, int voidprint) | |
7566401a | 38 | |
e5178960 PS |
39 | if (exp && *exp) |
40 | { | |
6ed6bacf AM |
41 | + if (strcmp (exp, "errno") == 0) |
42 | + exp = "*((int *(*) (void)) __errno_location) ()"; | |
e5178960 | 43 | expr = parse_expression (exp); |
6ed6bacf | 44 | old_chain = make_cleanup (free_current_contents, &expr); |
e5178960 | 45 | cleanup = 1; |
e5178960 | 46 | Index: gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.c |
3a58abaf AM |
47 | =================================================================== |
48 | --- /dev/null 1970-01-01 00:00:00.000000000 +0000 | |
e5178960 | 49 | +++ gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.c 2011-03-29 10:55:35.000000000 +0200 |
3a58abaf AM |
50 | @@ -0,0 +1,28 @@ |
51 | +/* This testcase is part of GDB, the GNU debugger. | |
52 | + | |
53 | + Copyright 2005, 2007 Free Software Foundation, Inc. | |
54 | + | |
55 | + This program is free software; you can redistribute it and/or modify | |
56 | + it under the terms of the GNU General Public License as published by | |
57 | + the Free Software Foundation; either version 3 of the License, or | |
58 | + (at your option) any later version. | |
59 | + | |
60 | + This program is distributed in the hope that it will be useful, | |
61 | + but WITHOUT ANY WARRANTY; without even the implied warranty of | |
62 | + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
63 | + GNU General Public License for more details. | |
64 | + | |
65 | + You should have received a copy of the GNU General Public License | |
66 | + along with this program. If not, see <http://www.gnu.org/licenses/>. | |
67 | + | |
68 | + Please email any bugs, comments, and/or additions to this file to: | |
69 | + bug-gdb@prep.ai.mit.edu */ | |
70 | + | |
71 | +#include <errno.h> | |
72 | + | |
73 | +int main() | |
74 | +{ | |
75 | + errno = 42; | |
76 | + | |
77 | + return 0; /* breakpoint */ | |
78 | +} | |
e5178960 | 79 | Index: gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.exp |
3a58abaf AM |
80 | =================================================================== |
81 | --- /dev/null 1970-01-01 00:00:00.000000000 +0000 | |
e5178960 | 82 | +++ gdb-7.2/gdb/testsuite/gdb.dwarf2/dw2-errno.exp 2011-03-29 10:55:35.000000000 +0200 |
51a5ef0f | 83 | @@ -0,0 +1,60 @@ |
3a58abaf AM |
84 | +# Copyright 2007 Free Software Foundation, Inc. |
85 | + | |
86 | +# This program is free software; you can redistribute it and/or modify | |
87 | +# it under the terms of the GNU General Public License as published by | |
88 | +# the Free Software Foundation; either version 3 of the License, or | |
89 | +# (at your option) any later version. | |
90 | +# | |
91 | +# This program is distributed in the hope that it will be useful, | |
92 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
93 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
94 | +# GNU General Public License for more details. | |
95 | +# | |
96 | +# You should have received a copy of the GNU General Public License | |
97 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
98 | + | |
3a58abaf AM |
99 | +set testfile dw2-errno |
100 | +set srcfile ${testfile}.c | |
101 | +set binfile ${objdir}/${subdir}/${testfile} | |
102 | + | |
103 | +proc prep {} { | |
104 | + global srcdir subdir binfile | |
105 | + gdb_exit | |
106 | + gdb_start | |
107 | + gdb_reinitialize_dir $srcdir/$subdir | |
108 | + gdb_load ${binfile} | |
109 | + | |
110 | + runto_main | |
111 | + | |
112 | + gdb_breakpoint [gdb_get_line_number "breakpoint"] | |
113 | + gdb_continue_to_breakpoint "breakpoint" | |
114 | +} | |
115 | + | |
116 | +if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g2"] != "" } { | |
117 | + untested "Couldn't compile test program" | |
118 | + return -1 | |
119 | +} | |
120 | +prep | |
121 | +gdb_test "print errno" ".* = 42" "errno with macros=N threads=N" | |
122 | + | |
123 | +if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g3"] != "" } { | |
124 | + untested "Couldn't compile test program" | |
125 | + return -1 | |
126 | +} | |
127 | +prep | |
128 | +gdb_test "print errno" ".* = 42" "errno with macros=Y threads=N" | |
129 | + | |
130 | +if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g2"] != "" } { | |
131 | + return -1 | |
132 | +} | |
133 | +prep | |
134 | +gdb_test "print errno" ".* = 42" "errno with macros=N threads=Y" | |
135 | + | |
136 | +if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "additional_flags=-g3"] != "" } { | |
137 | + return -1 | |
138 | +} | |
139 | +prep | |
140 | +gdb_test "print errno" ".* = 42" "errno with macros=Y threads=Y" | |
141 | + | |
142 | +# TODO: Test the error on resolving ERRNO with only libc loaded. | |
143 | +# Just how to find the current libc filename? |