http://bugzilla.opensuse.org/show_bug.cgi?id=1203118
Bug ID: 1203118
Summary: glibc debuginfo makes inferior call difficult
Classification: openSUSE
Product: openSUSE Tumbleweed
Version: Current
Hardware: Other
OS: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Development
Assignee: screening-team-bugs@suse.de
Reporter: tdevries@suse.com
QA Contact: qa-bugs@suse.de
Found By: ---
Blocker: ---
[ Minimized from gdb test-case gdb.base/break-main-file-remove-fail.exp. ]
Consider test-case test.c:
...
#include
int
main (void)
{
int res = munmap (0, 0);
return 0;
}
...
Compiled like this:
...
$ gcc -g test.c
...
Trying to do an inferior call to munmap has become complicated:
...
$ gdb -q -batch -iex "set debuginfod enabled on" a.out \
-ex "set trace-commands on" \
-ex start \
-ex n \
-ex "p res" \
-ex "p munmap" \
-ex "p munmap (0, 0)" \
-ex "p (int) munmap (0, 0)" \
-ex "p ((int (*) (void *, size_t)) munmap) (0, 0)"
+start
Temporary breakpoint 1 at 0x40113e: file test.c, line 6.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Temporary breakpoint 1, main () at test.c:6
6 int res = munmap (0, 0);
+n
8 return 0;
+p res
$1 = -1
+p munmap
$2 = {void (void)} 0x7ffff7feb9a0 <__GI_munmap>
+p munmap (0, 0)
$3 = void
+p (int) munmap (0, 0)
Invalid cast.
+p ((int (*) (void *, size_t)) munmap) (0, 0)
$4 = -1
...
AFAICT, this is due to libc debuginfo:
...
<0><189683>: Abbrev Number: 1 (DW_TAG_compile_unit)
<189684> DW_AT_stmt_list : 0xeba4b
<189688> DW_AT_low_pc : 0x10cad0
<189690> DW_AT_high_pc : 37
<189691> DW_AT_name : ../sysdeps/unix/syscall-template.S
<189695> DW_AT_comp_dir : /usr/src/debug/glibc-2.36-1.3.x86_64/misc
<189699> DW_AT_producer : GNU AS 2.39.0
<18969d> DW_AT_language : 32769 (MIPS assembler)
<1><18969f>: Abbrev Number: 2 (DW_TAG_subprogram)
<1896a0> DW_AT_name : __munmap
<1896a4> DW_AT_external : 1
<1896a5> DW_AT_low_pc : 0x10cad0
<1896ad> DW_AT_high_pc : 37
<1><1896ae>: Abbrev Number: 2 (DW_TAG_subprogram)
<1896af> DW_AT_name : __GI___munmap
<1896b3> DW_AT_external : 1
<1896b4> DW_AT_low_pc : 0x10cad0
<1896bc> DW_AT_high_pc : 37
<1><1896bd>: Abbrev Number: 2 (DW_TAG_subprogram)
<1896be> DW_AT_name : munmap
<1896c2> DW_AT_external : 0
<1896c3> DW_AT_low_pc : 0x10cad0
<1896cb> DW_AT_high_pc : 37
<1><1896cc>: Abbrev Number: 2 (DW_TAG_subprogram)
<1896cd> DW_AT_name : __GI_munmap
<1896d1> DW_AT_external : 1
<1896d2> DW_AT_low_pc : 0x10cad0
<1896da> DW_AT_high_pc : 37
...
If we ignore the shared library info using nosharedlibrary, we get instead:
...
+nosharedlibrary
+p munmap
$2 = {} 0x401030
+p munmap (0, 0)
'munmap@plt' has unknown return type; cast the call to its declared return type
+p (int) munmap (0, 0)
$3 = -1
+p ((int (*) (void *, size_t)) munmap) (0, 0)
$4 = -1
...
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