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<body><span class="vcard"><a class="email" href="mailto:i@maskray.me" title="Fangrui Song <i@maskray.me>"> <span class="fn">Fangrui Song</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - LLD executable segfaults with ld.bfd linker script"
href="https://bugs.llvm.org/show_bug.cgi?id=49846">bug 49846</a>
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<table border="1" cellspacing="0" cellpadding="8">
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>i@maskray.me
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - LLD executable segfaults with ld.bfd linker script"
href="https://bugs.llvm.org/show_bug.cgi?id=49846#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - LLD executable segfaults with ld.bfd linker script"
href="https://bugs.llvm.org/show_bug.cgi?id=49846">bug 49846</a>
from <span class="vcard"><a class="email" href="mailto:i@maskray.me" title="Fangrui Song <i@maskray.me>"> <span class="fn">Fangrui Song</span></a>
</span></b>
<pre>With traditional -z noseparate-code, GNU ld defaults to a RX/R/RW program
header layout. With -z separate-code (default on Linux/x86 from binutils 2.31
onwards), GNU ld defaults to a R/RX/R/RW program header layout.
I think your script is a -z noseparate-code layout.
LLD defaults to R/RX/RW(RELRO)/RW(non-RELRO). With --rosegment, LLD uses
RX/RW(RELRO)/RW(non-RELRO).
GNU ld's -z noseparate-code layout is not compatible with LLD --rosegment
because there is no maxpagesize alignment between text and rodata like:
. = SEGMENT_START("rodata-segment", ALIGN(CONSTANT (MAXPAGESIZE)) + (. &
(CONSTANT (MAXPAGESIZE) - 1)));
So the two PT_LOAD (RX) PT_LOAD (R) will actually overlap at runtime and the
executable segment will be remapped as readonly and the program will crash.
If you feed a ld.bfd -z separate-code linker script into ld.lld --rosegment, it
should work.</pre>
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