fix: #81 Added APPLCODE which follows CODE segment

Added code segment `APPLCODE` following code segment `CODE` and modified `mk/build.mk` to force user application code to be placed in the `APPLCODE` segment by default. This will place the libmsx library and standard C library code in the CODE segment and the user application code in the APPLCODE segment. So as long as the total size of the library code used by the application is approximately 16 KiB or less, it will work as expected.
mori0091 · Sep 7, 2024 · bcb6f70 · bcb6f70
1 parent 62e4827
commit bcb6f70
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diff --git a/crt0/crt0_mod_rom_header/app_megarom_header.s b/crt0/crt0_mod_rom_header/app_megarom_header.s
@@ -33,6 +33,7 @@
         ;; ---- ordering segments for linker
         .area   _HOME
         .area   _CODE
+        .area   _APPLCODE
         .area   _INITIALIZER
         .area   _GSINIT
         .area   _GSFINAL

diff --git a/crt0/crt0_mod_rom_header/app_rom_header.s b/crt0/crt0_mod_rom_header/app_rom_header.s
@@ -33,6 +33,7 @@
         ;; ---- ordering segments for linker
         .area   _HOME
         .area   _CODE
+        .area   _APPLCODE
         .area   _INITIALIZER
         .area   _GSINIT
         .area   _GSFINAL

diff --git a/mk/build.mk b/mk/build.mk
@@ -258,6 +258,7 @@ PAD2POW2 = ${LIBMSX_HOME}/bin/pad2pow2.sh
 CFLAGS ?=
 CFLAGS += -mz80 -MMD
 CFLAGS += -I ${LIBMSX_HOME}/include
+CFLAGS += --codeseg APPLCODE
 
 LIBMSX = ${LIBMSX_HOME}/lib/libmsx.lib