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<a href="https://gitlab.rtems.org/pfaiks">Preston Faiks</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5214#note_119874">commented</a>:
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The caller should not expect the FPSR to be "preserved" (identical) to what it was when it made the call, but it should expect that it contain the "cumulative exception bits" of anything that it calls. In this case it calls a routine which blocks but doesn't have any errors. When it returns it should contain the cumulative errors for that thread of execution, NOT all threads of execution.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">This is why theaddispatch.c contains this code:</p>
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<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="c" style="margin-top: 0;"> <span class="o" style="margin-top: 0;">**</span><span class="n">_Thread_Save_fp</span><span class="p">(</span> <span class="n">executing</span> <span class="p">)</span><span class="o">**</span><span class="p">;</span></span>
<span id="LC2" class="line" lang="c"> <span class="n" style="margin-top: 0;">_Context_Switch</span><span class="p">(</span> <span class="o">&</span><span class="n">executing</span><span class="o">-></span><span class="n">Registers</span><span class="p">,</span> <span class="o">&</span><span class="n">heir</span><span class="o">-></span><span class="n">Registers</span> <span class="p">);</span></span>
<span id="LC3" class="line" lang="c"> <span class="o" style="margin-top: 0;">**</span> <span class="nf">_Thread_Restore_fp</span><span class="p">(</span> <span class="n">executing</span> <span class="p">);</span><span class="o">**</span></span></code></pre>
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