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

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

[dclarke at blastwave dot 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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[Bug gdb/27750] local variables have wrong address and values on sparc64

[tromey at sourceware dot org]

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

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
> Possibly similar to 23220 however on 64-bit recent Debian sid with

I looked at bug #23220, but that one uses stabs, so it's probably
unrelated.

Can you attach your executable?  That might provide enough info
to find the problem.

Frequently, though, this kind of thing turns out to be a compiler bug.

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

[dclarke at blastwave dot org]

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

--- Comment #2 from Dennis Clarke <dclarke at blastwave dot org> ---

Seems like a good observation and I sort of wondered about the compiler
here. So then with gcc 9.3.0 from the Debian folks : 

mimas$ /usr/bin/sparc64-linux-gnu-gcc-9 --version 
sparc64-linux-gnu-gcc-9 (Debian 9.3.0-21) 9.3.0
Copyright (C) 2019 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$ 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$ /usr/bin/sparc64-linux-gnu-gcc-9 -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-9 foo.c 
mimas$ 
mimas$ which gdb
/home/dclarke/local/bin/gdb
mimas$ 
mimas$ TERM=dumb LC_ALL=C /home/dclarke/local/bin/gdb ./foo_gcc-9
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_gcc-9...
(gdb) break foo.c:13
Breakpoint 1 at 0x878: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-9 
a = 1
&a = 0x7fefffff5bc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a 
$2 = (int *) 0x7feffa5d49c
(gdb) cont
Continuing.
[Inferior 1 (process 53214) exited normally]
(gdb) quit
mimas$ 

I will attach two binaries : 

    1) foo_sparc64_gcc-10.xz  made with gcc 10.2.1

    2) foo_sparc64_gcc-9.xz   made with gcc 9.3.0

I may go get sources to a previous gdb release and see if I can build
and test.

Thank you so much for your kind attention to this.

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

[dclarke at blastwave dot org]

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

--- Comment #3 from Dennis Clarke <dclarke at blastwave dot org> ---
Created attachment 13375
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13375&action=edit
foo_sparc64_gcc-9.xz   made with gcc 9.3.0

Compile flags : 

mimas$ /usr/bin/sparc64-linux-gnu-gcc-9 -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-9 foo.c

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

[dclarke at blastwave dot org]

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

--- Comment #4 from Dennis Clarke <dclarke at blastwave dot org> ---
Created attachment 13376
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13376&action=edit
foo_sparc64_gcc-10.xz  made with gcc 10.2.1

Same compiler flags as noted in the bug report.

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

[tromey at sourceware dot org]

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

--- Comment #5 from Tom Tromey <tromey at sourceware dot org> ---
Another bit of info that might be useful is the output of
"info frame".

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

[dclarke at blastwave dot org]

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

--- Comment #6 from Dennis Clarke <dclarke at blastwave dot org> ---


As a follow up I can report that gdb 8.3.1 seems to work as expected :

mimas$ which gdb 
/usr/local/bin/gdb
mimas$ 
mimas$ /usr/local/bin/gdb --version 
GNU gdb (GDB) 8.3.1
Copyright (C) 2019 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$ 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

Lets compile that with GCC 9.3.0 : 

mimas$ /usr/bin/sparc64-linux-gnu-gcc-9 -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-9 foo.c 
mimas$ 

mimas$ TERM=dumb LC_ALL=C /usr/local/bin/gdb ./foo_gcc-9 
GNU gdb (GDB) 8.3.1
Copyright (C) 2019 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:
<http://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_gcc-9...
(gdb) break foo.c:13
Breakpoint 1 at 0x878: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-9 
a = 1
&a = 0x7fefffff5cc

Breakpoint 1, main (argc=1, argv=0x7fefffff978) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 1
(gdb) print &a 
$2 = (int *) 0x7fefffff5cc
(gdb) cont 
Continuing.
[Inferior 1 (process 104230) exited normally]
(gdb) quit
mimas$ 

That all looks correct. 

Lets try again with gdb 10.1 from Debian : 

mimas$ 
mimas$ PATH=/usr/bin:/bin:/usr/sbin:/sbin ; export PATH 
mimas$ 
mimas$ which gcc
/usr/bin/gcc
mimas$ 
mimas$ uname -a 
Linux mimas 5.10.0-6-sparc64 #1 Debian 5.10.28-1 (2021-04-09) sparc64 GNU/Linux
mimas$ 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$ gcc -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-10 foo.c
mimas$ 
mimas$ which gdb 
/usr/bin/gdb
mimas$ gdb --version 
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.
mimas$ TERM=dumb LC_ALL=C /usr/bin/gdb ./foo_gcc-10
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_gcc-10...
(gdb) break foo.c:13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-10 
a = 1
&a = 0x7fefffff5fc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a
$2 = (int *) 0x7feffd7727b
(gdb) info frame
Stack level 0, frame at 0x7feffd7727f:
 pc = 0x10000000858 in main (foo.c:13); saved pc = 0x7feffd76a88
 source language c.
 Arglist at 0x7feffd76a80, args: argc=0, argv=0x0
 Locals at 0x7feffd76a80, Previous frame's sp in fp
 Saved registers:
  l0 at 0x7feffd7727f, l1 at 0x7feffd77287, l2 at 0x7feffd7728f, l3 at
0x7feffd77297, l4 at 0x7feffd7729f, l5 at 0x7feffd772a7,
  l6 at 0x7feffd772af, l7 at 0x7feffd772b7, i0 at 0x7feffd772bf, i1 at
0x7feffd772c7, i2 at 0x7feffd772cf, i3 at 0x7feffd772d7,
  i4 at 0x7feffd772df, i5 at 0x7feffd772e7, fp at 0x7feffd772ef, i7 at
0x7feffd772f7
(gdb) cont
Continuing.
[Inferior 1 (process 104253) exited normally]
(gdb) quit
mimas$ 

Not sure how this compares to the gdb 8.3.1 : 

mimas$ 
mimas$ TERM=dumb LC_ALL=C /usr/local/bin/gdb ./foo_gcc-10
GNU gdb (GDB) 8.3.1
Copyright (C) 2019 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:
<http://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_gcc-10...
(gdb) break foo.c:13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-10 
a = 1
&a = 0x7fefffff5fc

Breakpoint 1, main (argc=1, argv=0x7fefffff9a8) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 1
(gdb) print &a
$2 = (int *) 0x7fefffff5fc
(gdb) info frame
Stack level 0, frame at 0x7fefffff600:
 pc = 0x10000000858 in main (foo.c:13); saved pc = 0xfffff8010014e804
 source language c.
 Arglist at 0x7fefffff600, args: argc=1, argv=0x7fefffff9a8
 Locals at 0x7fefffff600, Previous frame's sp in fp
 Saved registers:
  l0 at 0x7fefffff600, l1 at 0x7fefffff608, l2 at 0x7fefffff610, l3 at
0x7fefffff618, l4 at 0x7fefffff620, l5 at 0x7fefffff628,
  l6 at 0x7fefffff630, l7 at 0x7fefffff638, i0 at 0x7fefffff640, i1 at
0x7fefffff648, i2 at 0x7fefffff650, i3 at 0x7fefffff658,
  i4 at 0x7fefffff660, i5 at 0x7fefffff668, fp at 0x7fefffff670, i7 at
0x7fefffff678
(gdb) quit
A debugging session is active.

        Inferior 1 [process 104258] will be killed.

Quit anyway? (y or n) y
mimas$ 

Is there any other data I can get here ?

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

[simark at simark dot ca]

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

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simark at simark dot ca

--- Comment #7 from Simon Marchi <simark at simark dot ca> ---
Can you try with the latest gdb-10-branch (the soon-to-be GDB 10.2)?

https://sourceware.org/git/?p=binutils-gdb.git;a=shortlog;h=refs/heads/gdb-10-branch

I believe this is fixed there.

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

[tromey at sourceware dot org]

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

--- Comment #8 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Simon Marchi from comment #7)
> Can you try with the latest gdb-10-branch (the soon-to-be GDB 10.2)?
> 
> https://sourceware.org/git/?p=binutils-gdb.git;a=shortlog;h=refs/heads/gdb-
> 10-branch
> 
> I believe this is fixed there.

It sounds like you have a theory of what the problem is... ?
If so it would be good to know, since I didn't recognize the problem.

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

[simark at simark dot ca]

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

--- Comment #9 from Simon Marchi <simark at simark dot ca> ---
(In reply to Tom Tromey from comment #8)
> (In reply to Simon Marchi from comment #7)
> > Can you try with the latest gdb-10-branch (the soon-to-be GDB 10.2)?
> > 
> > https://sourceware.org/git/?p=binutils-gdb.git;a=shortlog;h=refs/heads/gdb-
> > 10-branch
> > 
> > I believe this is fixed there.
> 
> It sounds like you have a theory of what the problem is... ?
> If so it would be good to know, since I didn't recognize the problem.

Yes, sorry, I wrote that in a hurry.

I remembered fixing something for sparc, and indeed this commit fixes the bug
reported by Dennis for me (before that commit, I see the bug):

gdb: set current thread in sparc_{fetch,collect}_inferior_registers (PR
gdb/27147)
ffc17e2c029aea90166d16f5d49503c2c2e20982

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

[dclarke at blastwave dot org]

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

--- Comment #10 from Dennis Clarke <dclarke at blastwave dot org> ---

I did checkout the gdb-10-branch and after a long and tedious build I
was surprised to see that "make install" seemed to actually install
nothing. That is a separate issue that I will figure out. 

However I can report that the behaviour seems sane :

mimas$ uname -a 
Linux mimas 5.10.0-6-sparc64 #1 Debian 5.10.28-1 (2021-04-09) sparc64 GNU/Linux
mimas$ cat /etc/debian_version 
11.0

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$ /usr/bin/sparc64-linux-gnu-gcc-10 --version 
sparc64-linux-gnu-gcc-10 (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$ /usr/bin/sparc64-linux-gnu-gcc-10 -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-10 foo.c
mimas$ 
mimas$ $HOME/local/build/binutils-gdb/gdb/gdb --version
GNU gdb (GDB) 10.1.90.20210419-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
mimas$ 
mimas$ TERM=dumb LC_ALL=C $HOME/local/build/binutils-gdb/gdb/gdb ./foo_gcc-10
GNU gdb (GDB) 10.1.90.20210419-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-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_gcc-10...
(gdb) break foo.c:13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-10 
a = 1
&a = 0x7fefffff4fc

Breakpoint 1, main (argc=1, argv=0x7fefffff8a8) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print &a
$1 = (int *) 0x7fefffff4fc
(gdb) print a
$2 = 1
(gdb) info frame
Stack level 0, frame at 0x7fefffff500:
 pc = 0x10000000858 in main (foo.c:13); saved pc = 0xfffff8010014e804
 source language c.
 Arglist at 0x7fefffff500, args: argc=1, argv=0x7fefffff8a8
 Locals at 0x7fefffff500, Previous frame's sp in fp
 Saved registers:
  l0 at 0x7fefffff500, l1 at 0x7fefffff508, l2 at 0x7fefffff510, l3 at
0x7fefffff518,
  l4 at 0x7fefffff520, l5 at 0x7fefffff528, l6 at 0x7fefffff530, l7 at
0x7fefffff538,
  i0 at 0x7fefffff540, i1 at 0x7fefffff548, i2 at 0x7fefffff550, i3 at
0x7fefffff558,
  i4 at 0x7fefffff560, i5 at 0x7fefffff568, fp at 0x7fefffff570, i7 at
0x7fefffff578
(gdb) cont
Continuing.
[Inferior 1 (process 162221) exited normally]
(gdb) quit
mimas$ 

Seems valid. 

Why is the status of this bug "unconfirmed"? 

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

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

[glaubitz at physik dot fu-berlin.de]

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

John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glaubitz at physik dot fu-berlin.d
                   |                            |e

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

[tromey at sourceware dot org]

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

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
   Target Milestone|---                         |10.2
         Resolution|---                         |FIXED

--- Comment #11 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Dennis Clarke from comment #10)
> I did checkout the gdb-10-branch and after a long and tedious build I
> was surprised to see that "make install" seemed to actually install
> nothing. That is a separate issue that I will figure out. 

FWIW, this definitely works for me.

> However I can report that the behaviour seems sane :

Thank you.

> Why is the status of this bug "unconfirmed"? 

gdb as a project isn't too meticulous about tracking bug status.
Some people will change the status to "new", some won't.
I tend not to look at the unconfirmed/new difference when looking
at bugs, so I'm one of the guilty ones here.

Anyway, since this is reported as fixed, I am going to close it now.
That's one state we do track :-)

Thanks for your report & for building and trying out a newer gdb.

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

[ahmedsayeed1982 at yahoo dot com]

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

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982 at yahoo dot com

--- Comment #12 from Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> ---
 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
http://steemfilter.space/

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

[ucelsanicin at yahoo dot com]

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

Ucel Sani <ucelsanicin at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ucelsanicin at yahoo dot com

--- Comment #13 from Ucel Sani <ucelsanicin at yahoo dot com> ---
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[Bug gdb/27750] local variables have wrong address and values on sparc64

[marlenesanchez231+gaby at gmail dot com]

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

Gabyta <marlenesanchez231+gaby at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marlenesanchez231+gaby@gmai
                   |                            |l.com

--- Comment #14 from Gabyta <marlenesanchez231+gaby at gmail dot com> ---
Good to know if was fixed at last! https://www.hortomallas.com/

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

[mark at klomp dot org]

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

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

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

[donipah907 at mtlcz dot com]

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

james rohan <donipah907 at mtlcz dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |donipah907 at mtlcz dot com

--- Comment #15 from james rohan <donipah907 at mtlcz dot com> ---
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[Bug gdb/27750] local variables have wrong address and values on sparc64

[focixujo at livinginsurance dot co.uk]

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

james robin <focixujo at livinginsurance dot co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |focixujo at livinginsurance dot co
                   |                            |.uk

--- Comment #16 from james robin <focixujo at livinginsurance dot co.uk> ---
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[Bug gdb/27750] local variables have wrong address and values on sparc64

[mehmetgelisin at aol dot com]

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

Mehmet gelisin <mehmetgelisin at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mehmetgelisin at aol dot com

--- Comment #17 from Mehmet gelisin <mehmetgelisin at aol dot com> ---
gdb: fix value_subscript when array upper bound is not known
http://www-look-4.com/

    Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for
    non-constant range bounds"), subscripting  flexible array member fails:
    http://www.compilatori.com/
        struct no_size
        {
          int n;
          int items[]; http://www.wearelondonmade.com/
        };

        (gdb) p *ns http://www.jopspeech.com/
        $1 = {n = 3, items = 0x5555555592a4}
        (gdb) p ns->items[0]
        Cannot access memory at address 0xfffe555b733a0164 http://joerg.li/
        (gdb) p *((int *) 0x5555555592a4)
        $2 = 101  <--- we would expect that
        (gdb) p &ns->items[0] http://connstr.net/ 
        $3 = (int *) 0xfffe5559ee829a24  <--- wrong address

    Since the flexible array member (items) http://embermanchester.uk/  has an
unspecified size, the array type
    created for it in the DWARF http://www.slipstone.co.uk/  doesn't have
dimensions (this is with gcc 9.3.0,
    Ubuntu 20.04):

        0x000000a4:   DW_TAG_array_type
                        DW_AT_type [DW_FORM_ref4]   http://www.logoarts.co.uk/ 
   (0x00000038 "int")
                        DW_AT_sibling [DW_FORM_ref4]    (0x000000b3)

        0x000000ad:     DW_TAG_subrange_type
                          DW_AT_type [DW_FORM_ref4]     (0x00000031 "long
unsigned int")

    This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined
    constant low bound (dynamic_prop with kind PROP_CONST) and an undefined
    high bound (dynamic_prop with kind PROP_UNDEFINED).
http://www.acpirateradio.co.uk/ 

    value_subscript gets both bounds of that range using
    get_discrete_bounds.  Before commit 7c6f27129631, get_discrete_bounds
    didn't check the kind of the dynamic_props and would just blindly read
    them as if they were PROP_CONST.  It would return 0 for the high bound,
    because we zero-initialize the range_bounds structure.  And it didn't
    really matter in this case, because the returned high bound wasn't used
    in the end. https://waytowhatsnext.com/ 

    Commit 7c6f27129631 changed get_discrete_bounds to return a failure if
    either the low or high bound is not a constant, to make sure we don't
    read a dynamic prop that isn't a PROP_CONST as a PROP_CONST.  This
    change made get_discrete_bounds start to return a failure for that
    range, and as a result would not set https://www.webb-dev.co.uk/  *lowp and
*highp.  And since
    value_subscript doesn't check get_discrete_bounds' return value, it just
    carries on an uses an uninitialized value for the low bound.  If
    value_subscript did check the return value of get_discrete_bounds, we
    would get an error message instead of a bogus value.  But it would still
    be a bug, as we wouldn't be able to print the flexible array member's
    elements. http://www.iu-bloomington.com/ 

    Looking at value_subscript, we see that the low bound is always needed,
    but the high bound is only needed if !c_style.  So, change
    value_subscript to use get_discrete_low_bound and
    get_discrete_high_bound separately.  This fixes the case described
    above, where the low bound is known but the high bound isn't (and is not
    needed).  This restores the original behavior without accessing a
    dynamic_prop in a wrong way.

    A test is added.  In addition to the case described above, a case with
    an array member of size 0 is added, which is a GNU C extension that
    existed before flexible array members were introduced.  That case
    currently fails when compiled with gcc <= 8.  gcc <= 8 produces DWARF
    similar to the one shown above, while gcc 9 adds a DW_AT_count of 0 in
    there, which makes the high bound known.  A case where an array member
    of size 0 is the only member of the struct is also added, as that was
    how PR 28675 was originally reported, and it's an interesting corner
    case that I think could trigger other funny bugs.
https://komiya-dental.com/

    Question about the implementation: in value_subscript, I made it such
    that if the low or high bound is unknown, we fall back to zero.  That
    effectively makes it the same as it was before 7c6f27129631.  But should
    we instead error() out?

    gdb/ChangeLog:

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

[jarilittlenen at yahoo dot com]

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

Jari Littlenen <jarilittlenen at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jarilittlenen at yahoo dot com

--- Comment #18 from Jari Littlenen <jarilittlenen at yahoo dot com> ---
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./foo_gcc-10...
(gdb) break foo.c:13 http://codefreewifigratuit.xyz/
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-10 
a = 1
&a = 0x7fefffff5fc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13    https://fraisiachris.fr/      return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a
$2 = (int *) 0x7feffd7727b
(gdb) info frame
Stack level 0, frame at 0x7feffd7727f:
 pc = 0x10000000858 in main (foo.c:13); saved pc = 0x7feffd76a88
 source language c.
 Arglist at 0x7feffd76a80, args: argc=0, argv=0x0
 Locals at 0x7feffd76a80, Previous frame's sp in fp
 Saved registers: http://www.canalisationengorgee.fr/
  l0 at 0x7feffd7727f, l1 at 0x7feffd77287, l2 at 0x7feffd7728f, l3 at
0x7feffd77297, l4 at 0x7feffd7729f, l5 at 0x7feffd772a7,
  l6 at 0x7feffd772af, l7 at 0x7feffd772b7, i0 at 0x7feffd772bf, i1 at
0x7feffd772c7, i2 at 0x7feffd772cf, i3 at 0x7feffd772d7,
  i4 at 0x7feffd772df, i5 at 0x7feffd772e7, fp at 0x7feffd772ef, i7 at
0x7feffd772f7
(gdb) cont
Continuing.
[Inferior 1 (process 104253) exited normally]
(gdb) quit
mimas$ 
https://www.vincentlevi.com/
Not sure how this compares to the gdb 8.3.1 : 

mimas$ 
mimas$ TERM=dumb LC_ALL=C /usr/local/bin/gdb ./foo_gcc-10

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

[diheto5497 at secbuf dot com]

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

diheto <diheto5497 at secbuf dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |diheto5497 at secbuf dot com

--- Comment #19 from diheto <diheto5497 at secbuf dot com> ---
I know your expertise on this. I must say we should have an online discussion
on this. Writing only comments will close the discussion straight away! And
will restrict the benefits from this information.
https://abbicare.com.au/
https://www.miningbusiness.net/
https://getweightfast.com
https://www.aloeveraproductsshop.eu/

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

[marlenesanchez231+jaime at gmail dot com]

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

Chris James <marlenesanchez231+jaime at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marlenesanchez231+jaime@gma
                   |                            |il.com

--- Comment #20 from Chris James <marlenesanchez231+jaime at gmail dot com> ---
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./foo_gcc-10...
(gdb) break foo.c:13
Breakpoint 1 at 0x858: file foo.c, line 13.
(gdb) run
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https://sophiexbx.tumblr.com/
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Starting program: /home/dclarke/foo_gcc-10 
a = 1
&a = 0x7fefffff4fc
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https://never-gonna-be-alone-sz.tumblr.com/
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https://youareatypo.tumblr.com/

Breakpoint 1, main (argc=1, argv=0x7fefffff8a8) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print &a
$1 = (int *) 0x7fefffff4fc
(gdb) print a
$2 = 1
(gdb) info frame
Stack level 0, frame at 0x7fefffff500:
 pc = 0x10000000858 in main (foo.c:13); saved pc = 0xfffff8010014e804
 source language c.
 Arglist at 0x7fefffff500, args: argc=1, argv=0x7fefffff8a8
 Locals at 0x7fefffff500, Previous frame's sp in fp

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

[gulsenenginar at aol dot com]

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

Gulsen Engin <gulsenenginar at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gulsenenginar at aol dot com

--- Comment #21 from Gulsen Engin <gulsenenginar at aol dot com> ---
Possibly similar to 23220 however on 64-bit recent Debian sid with
trivial code I see : https://www.webb-dev.co.uk/category/crypto/

mimas$ 
mimas$ uname -a  http://www.compilatori.com/category/services/
Linux mimas 5.10.0-6-sparc64 #1 Debian 5.10.28-1 (2021-04-09) sparc64 GNU/Linux
mimas$ 
http://www.acpirateradio.co.uk/category/services/
mimas$ 
mimas$ /usr/bin/gcc --version  http://www.logoarts.co.uk/category/services/
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
http://www.slipstone.co.uk/category/services/ 
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

mimas$  http://embermanchester.uk/category/services/

mimas$ 
mimas$ cat -n foo.c  http://connstr.net/category/services/
     1
     2  #include <stdio.h>
     3  #include <stdlib.h>
     4 http://joerg.li/category/services/
     5  int main(int argc, char **argv)
     6  {
     7      int a = 1;
     8 http://www.jopspeech.com/category/services/
     9      printf("a = %i\n", a);
    10 http://www.wearelondonmade.com/category/services/
    11      printf("&a = %p\n", &a);
    12
    13      return EXIT_SUCCESS;
    14 https://waytowhatsnext.com/category/crypto/
    15  }
    16
mimas$  http://www.iu-bloomington.com/category/crypto/

mimas$ 
mimas$ /usr/bin/gcc -std=iso9899:1999 -pedantic -pedantic-errors -fno-builtin
https://komiya-dental.com/category/crypto/  -g -m64 -O0 -mno-app-regs
-mcpu=ultrasparc -mmemory-model=tso -o foo foo.c 
mimas$  http://www-look-4.com/category/services/

mimas$ 
mimas$ TERM=dumb LC_ALL=C /usr/bin/gdb ./foo
GNU gdb (Debian 10.1-2) 10.1.90.20210103-git

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

[oficaj3 at gmail dot com]

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

oficaj3 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |oficaj3 at gmail dot com

--- Comment #22 from oficaj3 at gmail dot com ---
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[Bug gdb/27750] local variables have wrong address and values on sparc64

[progonsaytu at gmail dot com]

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

progonsaytu <progonsaytu at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |progonsaytu at gmail dot com

--- Comment #23 from progonsaytu <progonsaytu at gmail dot com> ---
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[Bug gdb/27750] local variables have wrong address and values on sparc64

[glassmtech at ukr dot net]

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

glassmtech <glassmtech at ukr dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glassmtech at ukr dot net

--- Comment #24 from glassmtech <glassmtech at ukr dot net> ---
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