make: remove asm.make and use asm/SOURCES directly

asm.make replaces source files listed in asm/SOURCES with
a corresponding .c or .S file under firmware/asm/${ARCH}.
This makes it difficult to handle differences within one
architecture, eg. different instruction sets or versions
of the architecture.

Get rid of asm.make, and instead use the preprocessor to
select the architecture-specific sources directly from
asm/SOURCES. This is slightly more verbose but is more
flexible.

Change-Id: Id2a484794d5d951b7ba7b54a552de6960414fa45

firmware/asm/SOURCES

@@ -1,11 +1,41 @@
+#if defined(CPU_ARM)
+arm/ffs.S
+arm/memset16.S
+#elif defined(CPU_MIPS)
+mips/ffs.S
+memset16.c
+#elif defined(CPU_COLDFIRE)
+m68k/ffs.S
+m68k/memset16.S
+#else
 ffs.c
 memset16.c
+#endif
+
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE) || defined(HAVE_ROCKBOX_C_LIBRARY)
+#if defined(CPU_ARM)
+arm/memcpy.S
+arm/memmove.S
+arm/memset.S
+strlen.c
+#elif defined(CPU_MIPS)
+mips/memcpy.S
+memmove.c
+mips/memset.S
+strlen.c
+#elif defined(CPU_COLDFIRE)
+m68k/memcpy.S
+m68k/memmove.S
+m68k/memset.S
+m68k/strlen.S
+#else
 memcpy.c
+mempcpy.c
 memmove.c
 memset.c
 strlen.c
 #endif
+#endif
 
 #if defined(WIN32) || defined(APPLICATION)
 mempcpy.c
@@ -21,6 +51,10 @@ mempcpy.c
 #if LCD_DEPTH >= 24
 lcd-as-memframe-24bit.c
 #else
+#if defined(CPU_ARM)
+arm/lcd-as-memframe.S
+#else
 lcd-as-memframe.c
-#endif
+#endif /* CPU_ARM */
+#endif /* LCD_DEPTH */
 #endif

firmware/asm/asm.make

@@ -1,29 +0,0 @@
-#             __________               __   ___.
-#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
-#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
-#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
-#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
-#                     \/            \/     \/    \/            \/
-# $Id$
-#
-
-# Collect dummy C files in firmware/asm
-ASM_DUMMY_SRC := $(notdir $(call preprocess, $(FIRMDIR)/asm/SOURCES))
-
-# Get the corresponding real source files under firmware/asm/$ARCH (C or ASM)
-# strip arch_ prefix from $(ARCH)
-ASM_ARCH := $(subst arch_,,$(ARCH))
-ASM_C_SRC := $(addprefix $(FIRMDIR)/asm/$(ASM_ARCH)/,$(ASM_DUMMY_SRC))
-ASM_S_SRC := $(ASM_C_SRC:.c=.S)
-
-# ASM_SRC now contains only files that exist under $ARCH
-ASM_SRC := $(wildcard $(ASM_C_SRC))
-ASM_SRC += $(wildcard $(ASM_S_SRC))
-
-# GEN_SRC now contains a .c for each file in ASM_DUMMY_SRC that's not in ASM_SRC
-# I.e. fallback to a generic C source if no corresponding file in $ARCH is found
-GEN_SRC := $(filter-out $(notdir $(ASM_SRC:.S=.c)),$(ASM_DUMMY_SRC))
-GEN_SRC := $(addprefix $(FIRMDIR)/asm/,$(GEN_SRC))
-
-FIRMLIB_SRC += $(ASM_SRC)
-FIRMLIB_SRC += $(GEN_SRC)

firmware/firmware.make

@@ -13,11 +13,11 @@ ifndef APP_TYPE
 INCLUDES += -I$(FIRMDIR)/libc/include
 endif
 
-include $(FIRMDIR)/asm/asm.make
 ifneq ($(filter reggen,$(TOOLSET)),)
   include $(FIRMDIR)/reggen/reggen.make
 endif
 
+FIRMLIB_SRC += $(call preprocess, $(FIRMDIR)/asm/SOURCES)
 FIRMLIB_SRC += $(call preprocess, $(FIRMDIR)/SOURCES)
 FIRMLIB_OBJ := $(call c2obj, $(FIRMLIB_SRC))
 FIRMLIB_OBJ += $(BUILDDIR)/sysfont.o