mode5 and exit code

Author: rumbledethumps

asminc/rp6502.inc

@@ -81,6 +81,7 @@ RIA_ATTR_RLN_LENGTH       := $03
 RIA_ATTR_LRAND            := $04
 RIA_ATTR_BEL              := $05
 RIA_ATTR_LAUNCHER         := $06
+RIA_ATTR_EXIT_CODE        := $07
 
 ; 6522 VIA
 VIA             := $FFD0        ; VIA base address

include/rp6502.h

@@ -139,6 +139,7 @@ long __fastcall__ ria_call_long (unsigned char op);
 #define RIA_ATTR_LRAND 0x04
 #define RIA_ATTR_BEL 0x05
 #define RIA_ATTR_LAUNCHER 0x06
+#define RIA_ATTR_EXIT_CODE 0x07
 
 /* C API for the operating system. */
 
@@ -293,4 +294,11 @@ typedef struct
     unsigned char has_opacity_metadata; // bool
 } vga_mode4_asprite_t;
 
+typedef struct {
+    int x_pos_px;
+    int y_pos_px;
+    unsigned xram_sprite_ptr;
+    unsigned palette_ptr;
+} vga_mode5_sprite_t;
+
 #endif /* _RP6502_H */

libsrc/rp6502/initenv.s

@@ -0,0 +1,17 @@
+;
+; 2023, Rumbledethumps
+;
+; initenv - stub for getenv()/putenv() support.
+; The rp6502 target has no host environment variables,
+; so this constructor is intentionally empty.
+;
+
+.export initenv
+
+.segment "ONCE"
+
+.proc initenv
+
+    rts
+
+.endproc