Add arm endianness-aware assembly infrastructure

Introduce m4 macros to conditionally handle differences of little- and
big-endian arm in assembler code.

1 files changed, 8 insertions, 0 deletions

diff --git a/asm.m4 b/asm.m4
index 4018c235..8da47201 100644
--- a/asm.m4
+++ b/asm.m4
@@ -51,6 +51,14 @@ define(<ALIGN>,
 <.align ifelse(ALIGN_LOG,yes,<m4_log2($1)>,$1)
 >)
 
+define(<IF_BE>, <ifelse(
+WORDS_BIGENDIAN,yes,<$1>,
+WORDS_BIGENDIAN,no,<$2>,
+<errprint(<Unsupported endianness value>,WORDS_BIGENDIAN,<
+>)
+  m4exit(1)>)>)
+define(<IF_LE>, <IF_BE(<$2>, <$1>)>)
+
 dnl Struct defining macros
 
 dnl STRUCTURE(prefix)