[PATCH] libelf: Update SH_ENTSIZE_HASH comment.

[Mark Wielaard <mark@klomp.org>]

The elf-knowledge.h contains various macros to deal with specific ELF
knowledge needed to interpret some ELF constructs that can be ambigious
depending on architecture ABI. Update the comment of SH_ENTSIZE_HASH
to add a more technical description of why it is needed.

Signed-off-by: Mark Wielaard <mark@klomp.org>
---
 libelf/ChangeLog       | 4 ++++
 libelf/elf-knowledge.h | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/libelf/ChangeLog b/libelf/ChangeLog
index b15508f2..7a34977d 100644
--- a/libelf/ChangeLog
+++ b/libelf/ChangeLog
@@ -1,3 +1,7 @@
+2020-11-06  Mark Wielaard  <mark@klomp.org>
+
+	* elf-knowledge.h (SH_ENTSIZE_HASH): Update comment.
+
 2020-10-28  Mark Wielaard  <mark@klomp.org>
 
 	* elf.h: Update from glibc.
diff --git a/libelf/elf-knowledge.h b/libelf/elf-knowledge.h
index 9d3be0ff..6e005fa5 100644
--- a/libelf/elf-knowledge.h
+++ b/libelf/elf-knowledge.h
@@ -69,9 +69,9 @@
 
    Several years later the ABI for the 64-bit S390s was developed.
    Many things were copied from the IA-64 ABI (which uses the correct
-   32-bit entry size) but what do these people do?  They use 64-bit
-   entries.  It is really shocking to see what kind of morons are out
-   there.  And even worse: they are allowed to design ABIs.  */
+   32-bit entry size) but it does get the SHT_HASH entry size wrong by
+   using a 64-bit entry size.  So now we need this macro to special
+   case both the alpha and s390x ABIs.  */
 #define SH_ENTSIZE_HASH(Ehdr) \
   ((Ehdr)->e_machine == EM_ALPHA					      \
    || ((Ehdr)->e_machine == EM_S390					      \
-- 
2.18.4