diff --git a/apps/apps.make b/apps/apps.make
index bd675578e5..9c2d72fb9d 100644
--- a/apps/apps.make
+++ b/apps/apps.make
@@ -24,3 +24,5 @@ features $(BUILDDIR)/apps/features $(BUILDDIR)/apps/genlang-features: $(APPSDIR)
 		grep -v "^\#" | grep -v "^$$" > $(BUILDDIR)/apps/features; \
 		for f in `cat $(BUILDDIR)/apps/features`; do feat="$$feat:$$f" ; done ; \
 		echo "$$feat" >$(BUILDDIR)/apps/genlang-features
+
+ASMDEFS_SRC += $(APPSDIR)/core_asmdefs.c
diff --git a/apps/core_asmdefs.c b/apps/core_asmdefs.c
new file mode 100644
index 0000000000..f0847b2254
--- /dev/null
+++ b/apps/core_asmdefs.c
@@ -0,0 +1,17 @@
+#include <config.h>
+#include <bmp.h>
+
+/* To export a value for use in assembly files, define an int or unsigned here
+ * named AD_<name> and include apps/core_asmdefs.h in the assembly file.
+ * Identifiers without the AD_ prefix will be ignored, and can be used to
+ * create instances of structs for finding offsets to individual members.
+ */
+
+
+/* Size of a pixel with 8-bit components. */
+const int AD_pix8_size =
+#ifdef HAVE_LCD_COLOR
+	sizeof(struct uint8_rgb);
+#else
+	1;
+#endif
diff --git a/apps/recorder/jpeg_idct_arm.S b/apps/recorder/jpeg_idct_arm.S
index 75e3e4d2b3..d41b7a6aaa 100644
--- a/apps/recorder/jpeg_idct_arm.S
+++ b/apps/recorder/jpeg_idct_arm.S
@@ -22,6 +22,7 @@
 *
 ****************************************************************************/
 #include "config.h"
+#include "apps/core_asmdefs.h"
 
     .section .text
     .align   2
@@ -130,13 +131,8 @@ jpeg_idct2h:
     mvnhi  r5,  r5,  asr #31
     cmp    r4,  #255
     mvnhi  r4,  r4,  asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r5,  [r1]
-    strb   r4,  [r1, #4]
-#else
-    strb   r5,  [r1]
-    strb   r4,  [r1, #1]
-#endif
+    strb   r4,  [r1, #pix8_size]
     add    r0,  r0,  #16
     add    r1,  r1,  r3
     cmp    r0,  r2
@@ -152,13 +148,8 @@ jpeg_idct2h:
     usat   r4,  #8,  r12, asr #21
     sxth   r12, r12
     usat   r12, #8,  r12, asr #5
-#ifdef HAVE_LCD_COLOR
     strb   r4,  [r1]
-    strb   r12, [r1, #4]
-#else
-    strb   r4,  [r1]
-    strb   r12, [r1, #1]
-#endif
+    strb   r12, [r1, #pix8_size]
     add    r0,  r0,  #16
     add    r1,  r1,  r3
     cmp    r0,  r2
@@ -325,17 +316,10 @@ jpeg_idct4h:
     mvnhi  r4,  r4,  asr #31
     cmp    r5,  #255
     mvnhi  r5,  r5,  asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r9,  [r1]
-    strb   r8,  [r1, #4]
-    strb   r4,  [r1, #8]
-    strb   r5,  [r1, #12]
-#else
-    strb   r9,  [r1]
-    strb   r8,  [r1, #1]
-    strb   r4,  [r1, #2]
-    strb   r5,  [r1, #3]
-#endif
+    strb   r8,  [r1, #pix8_size]
+    strb   r4,  [r1, #2*pix8_size]
+    strb   r5,  [r1, #3*pix8_size]
     add    r0,  r0,  #16
     add    r1,  r1,  r3
     cmp    r0,  r2
@@ -372,17 +356,10 @@ jpeg_idct4h:
     mvnhi  r12, r12, asr #31
     cmp    r9,  #255
     mvnhi  r9,  r9,  asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r6,  [r1]
-    strb   r14, [r1, #4]
-    strb   r12, [r1, #8]
-    strb   r9,  [r1, #12]
-#else
-    strb   r6,  [r1]
-    strb   r14, [r1, #1]
-    strb   r12, [r1, #2]
-    strb   r9,  [r1, #3]
-#endif
+    strb   r14, [r1, #pix8_size]
+    strb   r12, [r1, #2*pix8_size]
+    strb   r9,  [r1, #3*pix8_size]
     add    r0,  r0,  #16
     add    r1,  r1,  r3
     cmp    r0,  r2
@@ -410,17 +387,10 @@ jpeg_idct4h:
     usat  r6,  #8,  r6,  asr #18
     usat  r12, #8,  r12, asr #18
     usat  r14, #8,  r14, asr #18
-#ifdef HAVE_LCD_COLOR
     strb   r8,  [r1]
-    strb   r6,  [r1, #12]
-    strb   r12, [r1, #4]
-    strb   r14, [r1, #8]
-#else
-    strb   r8,  [r1]
-    strb   r6,  [r1, #3]
-    strb   r12, [r1, #1]
-    strb   r14, [r1, #2]
-#endif
+    strb   r6,  [r1, #3*pix8_size]
+    strb   r12, [r1, #pix8_size]
+    strb   r14, [r1, #2*pix8_size]
     add   r0,  r0,  #16
     add   r1,  r1,  r3
     cmp    r0,  r2
@@ -645,25 +615,14 @@ jpeg_idct8h:
     mov    r8,  r8,  asr #21
     cmp    r8,  #255
     mvnhi  r8,  r8,  asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r8,  [r1]
-    strb   r8,  [r1, #4]
-    strb   r8,  [r1, #8]
-    strb   r8,  [r1, #12]
-    strb   r8,  [r1, #16]
-    strb   r8,  [r1, #20]
-    strb   r8,  [r1, #24]
-    strb   r8,  [r1, #28]
-#else
-    strb   r8,  [r1]
-    strb   r8,  [r1, #1]
-    strb   r8,  [r1, #2]
-    strb   r8,  [r1, #3]
-    strb   r8,  [r1, #4]
-    strb   r8,  [r1, #5]
-    strb   r8,  [r1, #6]
-    strb   r8,  [r1, #7]
-#endif
+    strb   r8,  [r1, #pix8_size]
+    strb   r8,  [r1, #2*pix8_size]
+    strb   r8,  [r1, #3*pix8_size]
+    strb   r8,  [r1, #4*pix8_size]
+    strb   r8,  [r1, #5*pix8_size]
+    strb   r8,  [r1, #6*pix8_size]
+    strb   r8,  [r1, #7*pix8_size]
     add    r1,  r1,  r3
     cmp    r0,  r2
     bcc    1b
@@ -752,25 +711,14 @@ jpeg_idct8h:
     mov    r14, r14, asr #18
     cmp    r14, #255
     mvnhi  r14, r14, asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r12, [r1]
-    strb   r4,  [r1, #4]
-    strb   r10, [r1, #8]
-    strb   r8,  [r1, #12]
-    strb   r9,  [r1, #16]
-    strb   r11, [r1, #20]
-    strb   r5,  [r1, #24]
-    strb   r14, [r1, #28]
-#else
-    strb   r12, [r1]
-    strb   r4,  [r1, #1]
-    strb   r10, [r1, #2]
-    strb   r8,  [r1, #3]
-    strb   r9,  [r1, #4]
-    strb   r11, [r1, #5]
-    strb   r5,  [r1, #6]
-    strb   r14, [r1, #7]
-#endif
+    strb   r4,  [r1, #pix8_size]
+    strb   r10, [r1, #2*pix8_size]
+    strb   r8,  [r1, #3*pix8_size]
+    strb   r9,  [r1, #4*pix8_size]
+    strb   r11, [r1, #5*pix8_size]
+    strb   r5,  [r1, #6*pix8_size]
+    strb   r14, [r1, #7*pix8_size]
 #else /* ARMv5+ */
     add    r12, r14, r4,  lsl #16
     orrs   r9,  r6,  r7
@@ -779,25 +727,14 @@ jpeg_idct8h:
     mov    r12, r12, asr #21
     cmp    r12, #255
     mvnhi  r12, r12, asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r12, [r1]
-    strb   r12, [r1, #4]
-    strb   r12, [r1, #8]
-    strb   r12, [r1, #12]
-    strb   r12, [r1, #16]
-    strb   r12, [r1, #20]
-    strb   r12, [r1, #24]
-    strb   r12, [r1, #28]
-#else
-    strb   r12, [r1]
-    strb   r12, [r1, #1]
-    strb   r12, [r1, #2]
-    strb   r12, [r1, #3]
-    strb   r12, [r1, #4]
-    strb   r12, [r1, #5]
-    strb   r12, [r1, #6]
-    strb   r12, [r1, #7]
-#endif
+    strb   r12, [r1, #pix8_size]
+    strb   r12, [r1, #2*pix8_size]
+    strb   r12, [r1, #3*pix8_size]
+    strb   r12, [r1, #4*pix8_size]
+    strb   r12, [r1, #5*pix8_size]
+    strb   r12, [r1, #6*pix8_size]
+    strb   r12, [r1, #7*pix8_size]
     add    r1,  r1,  r3
     cmp    r0,  r2
     bcc    1b
@@ -869,25 +806,14 @@ jpeg_idct8h:
     mov    r11, r11, asr #18
     cmp    r11, #255
     mvnhi  r11, r11, asr #31
-#ifdef HAVE_LCD_COLOR
     strb   r10, [r1]
-    strb   r12, [r1, #4]
-    strb   r8,  [r1, #8]
-    strb   r6,  [r1, #12]
-    strb   r7,  [r1, #16]
-    strb   r9,  [r1, #20]
-    strb   r14, [r1, #24]
-    strb   r11, [r1, #28]
-#else
-    strb   r10, [r1]
-    strb   r12, [r1, #1]
-    strb   r8,  [r1, #2]
-    strb   r6,  [r1, #3]
-    strb   r7,  [r1, #4]
-    strb   r9,  [r1, #5]
-    strb   r14, [r1, #6]
-    strb   r11, [r1, #7]
-#endif
+    strb   r12, [r1, #pix8_size]
+    strb   r8,  [r1, #2*pix8_size]
+    strb   r6,  [r1, #3*pix8_size]
+    strb   r7,  [r1, #4*pix8_size]
+    strb   r9,  [r1, #5*pix8_size]
+    strb   r14, [r1, #6*pix8_size]
+    strb   r11, [r1, #7*pix8_size]
 #endif
     add    r1,  r1,  r3
     cmp    r0,  r2
@@ -1009,25 +935,14 @@ jpeg_idct8h:
     bne    2f
     sxth   r4,  r4
     usat   r4,  #8,  r4,  asr #5
-#ifdef HAVE_LCD_COLOR
     strb   r4,  [r1]
-    strb   r4,  [r1, #4]
-    strb   r4,  [r1, #8]
-    strb   r4,  [r1, #12]
-    strb   r4,  [r1, #16]
-    strb   r4,  [r1, #20]
-    strb   r4,  [r1, #24]
-    strb   r4,  [r1, #28]
-#else
-    strb   r4,  [r1]
-    strb   r4,  [r1, #1]
-    strb   r4,  [r1, #2]
-    strb   r4,  [r1, #3]
-    strb   r4,  [r1, #4]
-    strb   r4,  [r1, #5]
-    strb   r4,  [r1, #6]
-    strb   r4,  [r1, #7]
-#endif
+    strb   r4,  [r1, #pix8_size]
+    strb   r4,  [r1, #2*pix8_size]
+    strb   r4,  [r1, #3*pix8_size]
+    strb   r4,  [r1, #4*pix8_size]
+    strb   r4,  [r1, #5*pix8_size]
+    strb   r4,  [r1, #6*pix8_size]
+    strb   r4,  [r1, #7*pix8_size]
     add    r1,  r1,  r3
     cmp    r0,  r2
     bcc    1b
@@ -1083,25 +998,14 @@ jpeg_idct8h:
     usat   r10, #8,  r10, asr #18
     usat   r7,  #8,  r7,  asr #18
     usat   r8,  #8,  r8,  asr #18
-#ifdef HAVE_LCD_COLOR
     strb   r6,  [r1]
-    strb   r4,  [r1, #4]
-    strb   r9,  [r1, #8]
-    strb   r14, [r1, #12]
-    strb   r12, [r1, #16]
-    strb   r10, [r1, #20]
-    strb   r7,  [r1, #24]
-    strb   r8,  [r1, #28]
-#else
-    strb   r6,  [r1]
-    strb   r4,  [r1, #1]
-    strb   r9,  [r1, #2]
-    strb   r14, [r1, #3]
-    strb   r12, [r1, #4]
-    strb   r10, [r1, #5]
-    strb   r7,  [r1, #6]
-    strb   r8,  [r1, #7]
-#endif
+    strb   r4,  [r1, #pix8_size]
+    strb   r9,  [r1, #2*pix8_size]
+    strb   r14, [r1, #3*pix8_size]
+    strb   r12, [r1, #4*pix8_size]
+    strb   r10, [r1, #5*pix8_size]
+    strb   r7,  [r1, #6*pix8_size]
+    strb   r8,  [r1, #7*pix8_size]
     cmp    r0,  r2
     add    r1,  r1,  r3
     bcc    1b
diff --git a/tools/addtargetdir.pl b/tools/addtargetdir.pl
index 6a9a72a878..2868e9027b 100755
--- a/tools/addtargetdir.pl
+++ b/tools/addtargetdir.pl
@@ -23,6 +23,7 @@ my $src;
 # Split the input file on any runs of '\' and whitespace.
 for (split(/[\s\\]+/m, <STDIN>)) {
     /^(\/)?[^:]+(\:)?$/;
+print ">>$& $src"
 # Save target and continue if this item ends in ':'
     if (!($2 && ($target=$&))) {
         $src = $&;
diff --git a/tools/functions.make b/tools/functions.make
index 66354ebc18..ba444267c4 100644
--- a/tools/functions.make
+++ b/tools/functions.make
@@ -25,6 +25,9 @@ preprocess = $(shell $(CC) $(PPCFLAGS) $(2) -E -P -x c -include config.h $(1) |
 preprocess2file = $(shell $(CC) $(PPCFLAGS) $(3) -E -P -x c -include config.h $(1) | \
 		grep -v '^\#' | grep -v "^$$" > $(2))
 
+asmdefs2file = $(shell $(CC) $(PPCFLAGS) $(3) -S -x c -o - -include config.h $(1) | \
+	perl -ne 'if(/^AD_(\w+):$$/){$$var=$$1}else{/^\W\.word\W(.*)$$/ && $$var && print "\#define $$var $$1\n";$$var=0}' > $2)
+
 c2obj = $(addsuffix .o,$(basename $(subst $(ROOTDIR),$(BUILDDIR),$(1))))
 
 # calculate dependencies for a list of source files $(2) and output them
@@ -32,6 +35,7 @@ c2obj = $(addsuffix .o,$(basename $(subst $(ROOTDIR),$(BUILDDIR),$(1))))
 mkdepfile = $(shell \
 	$(CC) $(PPCFLAGS) $(OTHER_INC) -MG -MM -include config.h $(2) | \
 	sed -e "s: lang.h: lang/lang_core.o:" \
+	-e 's:_asmdefs.o:_asmdefs.h:' \
 	-e "s: max_language_size.h: lang/max_language_size.h:" | \
 	$(TOOLSDIR)/addtargetdir.pl $(ROOTDIR) $(BUILDDIR) \
 	>> $(1)_)
diff --git a/tools/root.make b/tools/root.make
index 00586379c6..8a923983f9 100644
--- a/tools/root.make
+++ b/tools/root.make
@@ -51,8 +51,8 @@ endif
 
 all: $(DEPFILE) build
 
-# Subdir makefiles. their primary purpose is to populate SRC & OTHER_SRC
-# but they also define special dependencies and compile rules
+# Subdir makefiles. their primary purpose is to populate SRC, OTHER_SRC &
+# ASMDEFS_SRC but they also define special dependencies and compile rules
 include $(TOOLSDIR)/tools.make
 include $(FIRMDIR)/firmware.make
 include $(ROOTDIR)/apps/bitmaps/bitmaps.make
@@ -96,6 +96,7 @@ $(DEPFILE) dep:
 	@echo foo > /dev/null # there must be a "real" command in the rule
 	$(call mkdepfile,$(DEPFILE),$(SRC))
 	$(call mkdepfile,$(DEPFILE),$(OTHER_SRC))
+	$(call mkdepfile,$(DEPFILE),$(ASMDEFS_SRC))
 	@mv $(DEPFILE)_ $(DEPFILE)
 	$(call bmpdepfile,$(DEPFILE),$(BMP) $(PBMP))
 
@@ -317,6 +318,12 @@ $(BUILDDIR)/%.o: $(ROOTDIR)/%.S
 	$(SILENT)mkdir -p $(dir $@)
 	$(call PRINTS,CC $(subst $(ROOTDIR)/,,$<))$(CC) $(CFLAGS) -c $< -o $@
 
+# generated definitions for use in .S files
+$(BUILDDIR)/%_asmdefs.h: $(ROOTDIR)/%_asmdefs.c
+	$(call PRINTS,ASMDEFS $(@F))
+	$(SILENT)mkdir -p $(dir $@)
+	$(call asmdefs2file,$<,$@)
+
 # when source and object are both in BUILDDIR (generated code):
 %.o: %.c
 	$(SILENT)mkdir -p $(dir $@)