[Bug 198757] /boot/loader: c-addr shows negative on the stack

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198757

            Bug ID: 198757
           Summary: /boot/loader: c-addr shows negative on the stack
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dteske at FreeBSD.org

When booted into the loader(8) interactive prompt (ok>), character addresses
(c-addr) are showing up negative when using ".s" to display the stack contents.

Reproduce:

Press ESC at the boot loader menu to enter the loader(8) interactive prompt.
Type the following at the "ok>" prompt:

s" hello, world!" .s

and then press ENTER. You'll notice that the first number is negative. Previous
FreeBSD builds did not have this issue and it is confusing to see a negative
number on the stack despite being a perfectly valid character address.

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