<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/177250>177250</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [lld][WebAssembly] With `--stack-first` as default, it's unintuitive to reserve a segment of memory at the start of the linear memory
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            lld
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Taywee
      </td>
    </tr>
</table>

<pre>
    [tic-80#2880](https://github.com/nesbox/TIC-80/issues/2880) gives some relevant context.  Before #151015 , projects like TIC-80 and WASM4 often used `--global-base` to specify a reserved section of linear memory that was shared with the host, akin to memory-mapped I/O.  Now with `--stack-first`, the stack is still put before `--global-base`, which causes projects that had worked before to break when linked with newer versions of lld.  This can be worked around by explicitly setting `--stack-first` (for older versions) and setting your stack big enough to encompass the entire reserved space + desired stack size, but that's not extremely intuitive (and I worry about future changes in the layout still breaking after the fact).

For these kinds of situations, it would be nice if there was something like `--stack-base`, or `--memory-base` to allow more easily reserving a host memory range.
</pre>
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