[Bug gdb/27750] New: local variables have wrong address and values on sparc64

["dclarke at blastwave dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27750

            Bug ID: 27750
           Summary: local variables have wrong address and values on
                    sparc64
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: dclarke at blastwave dot org
  Target Milestone: ---

Possibly similar to 23220 however on 64-bit recent Debian sid with
trivial code I see : 

mimas$ 
mimas$ uname -a 
Linux mimas 5.10.0-6-sparc64 #1 Debian 5.10.28-1 (2021-04-09) sparc64 GNU/Linux
mimas$ 

mimas$ 
mimas$ /usr/bin/gcc --version 
gcc (Debian 10.2.1-6) 10.2.1 20210110
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

mimas$ 

mimas$ 
mimas$ cat -n foo.c 
     1
     2  #include <stdio.h>
     3  #include <stdlib.h>
     4
     5  int main(int argc, char **argv)
     6  {
     7      int a = 1;
     8
     9      printf("a = %i\n", a);
    10
    11      printf("&a = %p\n", &a);
    12
    13      return EXIT_SUCCESS;
    14
    15  }
    16
mimas$ 

mimas$ 
mimas$ /usr/bin/gcc -std=iso9899:1999 -pedantic -pedantic-errors -fno-builtin
-g -m64 -O0 -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso -o foo foo.c 
mimas$ 

mimas$ 
mimas$ TERM=dumb LC_ALL=C /usr/bin/gdb ./foo
GNU gdb (Debian 10.1-2) 10.1.90.20210103-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "sparc64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./foo...
(gdb) break 13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo 
a = 1
&a = 0x7fefffff5dc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a
$2 = (int *) 0x7feffc5325b
(gdb) cont
Continuing.
[Inferior 1 (process 52994) exited normally]
(gdb) quit
mimas$ 

With a fresh local build of gdb 10.1 I see the same behavior : 

mimas$ 
mimas$ which gdb
/home/dclarke/local/bin/gdb
mimas$ 
mimas$ gdb --version 
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
mimas$ 

mimas$ TERM=dumb LC_ALL=C /home/dclarke/local/bin/gdb ./foo
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "sparc64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./foo...
(gdb) break 13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo 
a = 1
&a = 0x7fefffff5cc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a
$2 = (int *) 0x7feffcf94ac
(gdb) cont
Continuing.
[Inferior 1 (process 52988) exited normally]
(gdb) quit
mimas$ 


-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional

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