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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLD does not update section start address"
href="https://bugs.llvm.org/show_bug.cgi?id=37608">37608</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLD does not update section start address
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>ELF
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eblot.ml@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20346" name="attach_20346" title="Sample code to reproduce the issue">attachment 20346</a> <a href="attachment.cgi?id=20346&action=edit" title="Sample code to reproduce the issue">[details]</a></span>
Sample code to reproduce the issue
Hi,
Using LLD 6.0.0 (host: macOS, target: armv7em bare metal), it seems LLD fails
to properly compute the start address of some of the successive sections, for
example in the following subset:
.pstack :
{
. = ALIGN(8);
__process_stack_base__ = .;
. += __process_stack_size__;
. = ALIGN(8);
__process_stack_end__ = .;
} > ram0
.mstack :
{
. = ALIGN(8);
__main_stack_base__ = .;
. += __main_stack_size__;
. = ALIGN(8);
__main_stack_end__ = .;
} > ram0
I expect that __main_stack_base__ is given an address equal of greater than
__process_stack_end__.
However:
Stack map with LLVM/LLD
20000000 B __main_stack_base__
20000000 B __process_stack_base__
While:
Stack map with GNU/LD
20000400 B __main_stack_base__
20000000 B __process_stack_base__
The proper address can be obtained by forcing the start address this way:
.mstack :
{
. = __process_stack_end__;
. = ALIGN(8);
__main_stack_base__ = .;
. += __main_stack_size__;
. = ALIGN(8);
__main_stack_end__ = .;
} > ram0
but it seems awkward.
I'm attaching a tiny tarball file w/ a build.sh script that reproduces the
issue with a very trivial application.</pre>
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