ref: 5182befa492f4d1cf7e3c7b278cdeb85170abc9c
parent: 39f95de83dd8cbdb42c84453f37bedab9ca8242d
author: Martin Storsjo <martin@martin.st>
date: Wed Mar 19 12:18:44 EDT 2014
ads2armasm_ms: Add an ALIGN 4 after ENDP This makes sure that labels for data symbols directly after functions get properly 4-byte-aligned (when the source is assembled in thumb mode). Previously, if declaring a data symbol directly after a function, the symbol could end up pointing to the unaligned address (if the total size of the thumb function didn't end up being a multiple of 4). The data in the symbol itself ended up aligned, but the symbol pointed to the preceding unaligned position. That is, a source file looking like this: --- ... ENDP symbol DCD 0x12345678 --- could end up being assembled into symbol: xxxxx2: 0000 xxxxx4: 5678 xxxxx6: 1234 (This doesn't happen if the symbol label is on the same line as the DCD directive.) By adding an ALIGN 4 directly after the ENDP we make sure the symbol itself gets aligned properly. This isn't an issue with the original, untranslated arm source, since it only is built in arm mode where all instructions are 4 byte, and since the gnu assembler automatically adds the padding before the symbol even in thumb mode. Change-Id: Iadbeebd656b0197e423e79a12a7d3ef8859cf445
--- a/build/make/ads2armasm_ms.pl
+++ b/build/make/ads2armasm_ms.pl
@@ -32,6 +32,7 @@
s/ldrneb/ldrbne/i;
s/ldrneh/ldrhne/i;
+ s/(ENDP.*)/$&\n ALIGN 4/;
print;
}
--
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