48 lines
1.8 KiB
Diff
48 lines
1.8 KiB
Diff
|
2008-02-24 Jan Kratochvil <jan.kratochvil@redhat.com>
|
||
|
|
|
||
|
|
Port to GDB-6.8pre.
|
||
|
|
|
||
|
|
currently for trivial nonthreaded helloworld with no debug info up to -ggdb2 you
|
||
|
|
will get:
|
||
|
|
(gdb) p errno
|
||
|
|
[some error]
|
||
|
|
|
||
|
|
* with -ggdb2 and less "errno" in fact does not exist anywhere as it was
|
||
|
|
compiled to "(*__errno_location ())" and the macro definition is not present.
|
||
|
|
Unfortunately gdb will find the TLS symbol and it will try to access it but
|
||
|
|
as the program has been compiled without -lpthread the TLS base register
|
||
|
|
(%gs on i386) is not setup and it will result in:
|
||
|
|
Cannot access memory at address 0x8
|
||
|
|
|
||
|
|
Attached suggestion patch how to deal with the most common "errno" symbol
|
||
|
|
for the most common under-ggdb3 compiled programs.
|
||
|
|
|
||
|
|
Original patch hooked into target_translate_tls_address. But its inferior
|
||
|
|
call invalidates `struct frame *' in the callers - RH BZ 690908.
|
||
|
|
|
||
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=1166549
|
||
|
|
|
||
|
|
2007-11-03 Jan Kratochvil <jan.kratochvil@redhat.com>
|
||
|
|
|
||
|
|
* ./gdb/dwarf2read.c (read_partial_die, dwarf2_linkage_name): Prefer
|
||
|
|
DW_AT_MIPS_linkage_name over DW_AT_name now only for non-C.
|
||
|
|
|
||
|
|
glibc-debuginfo-2.7-2.x86_64: /usr/lib/debug/lib64/libc.so.6.debug:
|
||
|
|
<81a2> DW_AT_name : (indirect string, offset: 0x280e): __errno_location
|
||
|
|
<81a8> DW_AT_MIPS_linkage_name: (indirect string, offset: 0x2808): *__GI___errno_location
|
||
|
|
|
||
|
|
diff --git a/gdb/printcmd.c b/gdb/printcmd.c
|
||
|
|
--- a/gdb/printcmd.c
|
||
|
|
+++ b/gdb/printcmd.c
|
||
|
|
@@ -1190,6 +1190,10 @@ print_command_1 (const char *exp, int voidprint)
|
||
|
|
|
||
|
|
if (exp && *exp)
|
||
|
|
{
|
||
|
|
+ /* '*((int *(*) (void)) __errno_location) ()' is incompatible with
|
||
|
|
+ function descriptors. */
|
||
|
|
+ if (target_has_execution && strcmp (exp, "errno") == 0)
|
||
|
|
+ exp = "*(*(int *(*)(void)) __errno_location) ()";
|
||
|
|
expression_up expr = parse_expression (exp);
|
||
|
|
val = evaluate_expression (expr.get ());
|
||
|
|
}
|