[Bug 292156] [patch] Fix conditional jump to incorrect label in 'build_l3_page_pagetable' for 0 entries

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292156

            Bug ID: 292156
           Summary: [patch] Fix conditional jump to incorrect label in
                    'build_l3_page_pagetable' for 0 entries
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 266785
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=266785&action=edit
fix jump to correct label

Hello,

I'm using qemu-system-aarch64 with kernel build from current 'main', based on
VIRT kernconf - and it does not boot. The fix is in attachment.

The kernel code has size 8M (etext), ergo perfectly aligned to 2M leaves.
The 'build_l3_page_pagetable' function - which populates 4K leaves - is called
with argument entries = 0 in register x10.

The first instruction (cbz x10, 2f) compares x10 against 0 and in case of match
it jumps to '2f' - which is a *first forward* label named '2' - which stores
the entry (not-yet-configured x13) into the page table (str x13, [x6, x11, lsl
#3]).

In the function, there is a second '2' label, right before 'ret' instruction,
which is where the conditional 'cbz x10, 2f' should aim.

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