hh2: provide metadata macros and a non-metadata marker by default

If none of the HH2_*() macros are used, the binary will show up as its
own filename instead of random garbage.

If HH2_NAME() is used the metadata will be read, and the binary format
requires that all fields by specified. Using only a subset of the macros
is invalid, but not reported.

fxcp_hh2.ld.c

@@ -43,7 +43,10 @@ SECTIONS
 	   - All text from .text and .text.* (including user code) */
 	.hh2 : {
 		KEEP(*(.hh2.header))
-		KEEP(*(.hh2.info))
+		KEEP(*(.hh2.info.name))
+		KEEP(*(.hh2.info.description))
+		KEEP(*(.hh2.info.author))
+		KEEP(*(.hh2.info.version))
 		KEEP(*(.hh2.stage2))
 		. = ALIGN(16);
 	} > eram AT> bin

include/gint/config.h.in

@@ -80,4 +80,26 @@
 #define GINT_RENDER_MONO (GINT_HW_FX || GINT_FX9860G_G3A)
 #define GINT_RENDER_RGB ((GINT_HW_CG || GINT_HW_CP) && !GINT_FX9860G_G3A)
 
+/* Macros for specifying HH2 binary metadata fields. Here because this header
+   is guaranteed to be included with every gint header. */
+#if GINT_HW_CP
+#define HH2_NAME(STR) \
+	GSECTION(".hh2.info.name") GVISIBLE \
+	char _hh2info_name[] = (STR);
+#define HH2_DESCRIPTION(STR) \
+	GSECTION(".hh2.info.description") GVISIBLE \
+	char _hh2info_description[] = (STR);
+#define HH2_AUTHOR(STR) \
+	GSECTION(".hh2.info.author") GVISIBLE \
+	char _hh2info_author[] = (STR);
+#define HH2_VERSION(STR) \
+	GSECTION(".hh2.info.version") GVISIBLE \
+	char _hh2info_version[] = (STR);
+#else
+#define HH2_NAME(STR)
+#define HH2_DESCRIPTION(STR)
+#define HH2_AUTHOR(STR)
+#define HH2_VERSION(STR)
+#endif
+
 #endif /* GINT_CONFIG */

src/kernel/start.S

@@ -122,4 +122,12 @@ _stage2:
 	   it's overriding the correct location. */
 	.long 1, 2, 3, 4, 5, 6, 7, 8
 
+/* Also provide default values for metadata fields. */
+
+.section .hh2.info.name
+.global __hh2info_name
+.weak __hh2info_name
+/* Zero byte will skip specifiying any of the data */
+__hh2info_name: .byte 0x00
+
 #endif /* GINT_OS_CP */