Turns out rules about PT_INTERP, PT_GNU_STACK and PT_GNU_PROPERTY
program headers are slightly different.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
v2: integrate into documentation build system
Documentation/ELF/ELF.rst | 32 ++++++++++++++++++++++++++++++++
Documentation/ELF/index.rst | 10 ++++++++++
Documentation/index.rst | 1 +
3 files changed, 43 insertions(+)
new file mode 100644
--- /dev/null
+++ b/Documentation/ELF/ELF.rst
@@ -0,0 +1,32 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=================================
+Linux-specific ELF idiosyncrasies
+=================================
+
+Definitions
+===========
+
+"First" program header is the one with the smallest offset in the file:
+e_phoff. "Last" program header is the one with the biggest offset:
+e_phoff + (e_phnum - 1) * sizeof(Elf_Phdr).
+
+PT_INTERP
+=========
+
+First PT_INTERP program header is used to locate the filename of ELF
+interpreter. Other PT_INTERP headers are ignored (since Linux 2.4.11).
+
+PT_GNU_STACK
+============
+
+Last PT_GNU_STACK program header defines userspace stack executability
+(since Linux 2.6.6). Other PT_GNU_STACK headers are ignored.
+
+PT_GNU_PROPERTY
+===============
+
+ELF interpreter's last PT_GNU_PROPERTY program header is used (since
+Linux 5.8). If interpreter doesn't have one, then the last PT_GNU_PROPERTY
+program header of an executable is used. Other PT_GNU_PROPERTY headers
+are ignored.
new file mode 100644
--- /dev/null
+++ b/Documentation/ELF/index.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===
+ELF
+===
+
+.. toctree::
+ :maxdepth: 1
+
+ ELF
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -113,6 +113,7 @@ to ReStructured Text format, or are simply too old.
:maxdepth: 1
staging/index
+ ELF/index
Translations
