[Bug gdb/31691] New: Cannot read high address memory on riscv64

[Bug gdb/31691] New: Cannot read high address memory on riscv64

[tsng.nullptr at outlook dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31691

            Bug ID: 31691
           Summary: Cannot read high address memory on riscv64
           Product: gdb
           Version: 14.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tsng.nullptr at outlook dot com
  Target Milestone: ---

When emulating bare metal riscv64 program with qemu, gdb is unable to read
memory of high address and saying an error "That operation is not available on
integers of more than 8 bytes".

To be more specefic, assuming the program is loadded at 0x80000000, and it uses
SV39 address translation. The page table is translating 0xffffffff80000000 to
0x80000000 and 0x80000000 to 0x80000000. Now, when I try to use "x 0x80000000",
gdb works as expected, while If I try "x 0xffffffff80000000", it shows the
error mentioned above.

The last normal version of gdb is 13.1, qemu version does not affect the
result.

riscv-system-qemu version: 7.1.0-9.0.0
riscv-elf-gdb version: 14.2

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[Bug gdb/31691] Cannot read high address memory on riscv64

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31691

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> ---
What does 'show lang' say?

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[Bug gdb/31691] Cannot read high address memory on riscv64

[tsng.nullptr at outlook dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31691

--- Comment #2 from tsng.nullptr at outlook dot com <tsng.nullptr at outlook dot com> ---
(In reply to Tom Tromey from comment #1)
> What does 'show lang' say?

It shows 'The current source language is "auto; current rust".'

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[Bug gdb/31691] Cannot read high address memory on riscv64

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31691

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
Ok, thanks.

As a workaround you can temporarily 'set lang c' before the 'x'
operation.

I'm going to mark this bug as a dup of the other one.

*** This bug has been marked as a duplicate of bug 31565 ***

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