casaroli commented on code in PR #19673:
URL: https://github.com/apache/nuttx/pull/19673#discussion_r3765665644
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include/nuttx/lib/elf.h:
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@@ -252,6 +264,28 @@ struct mod_loadinfo_s
* skip the copy.
*/
+ /* FDPIC state.
+ *
+ * An FDPIC object places its two PT_LOAD segments independently: the
+ * read-only one is mapped where it already sits on the media and the
+ * writable one is copied to RAM, once per running instance. That is
+ * what lets several instances share one copy of the text.
+ *
+ * fdpic - True if e_ident[EI_OSABI] marked this an FDPIC object.
+ * textpin - True if the read-only segment is held by a filesystem pin
+ * that has to be dropped at unload, rather than by an
+ * address the filesystem simply handed over.
+ */
+
+ bool fdpic;
+ bool textpin;
+
Review Comment:
the difference is that on FDPIC, `.text` and `.data` can have independent
region placement, this flag records `e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC`
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