Update linker script to allow c source files

sw/Makefile

@@ -2,7 +2,7 @@ CC=cl65
 CFLAGS=-t none
 LDFLAGS=-C link.ld
 
-NAME=main
+NAME=bootrom
 
 BIN=$(NAME).bin
 HEX=$(NAME).hex

sw/boot.S

@@ -0,0 +1,13 @@
+		.import _main
+		
+		.segment "VECTORS"
+		
+		.addr _init
+		.addr _init
+		.addr _init
+		
+		.code
+		
+_init:		jsr _main
+
+end:		jmp end

sw/link.ld

@@ -1,10 +1,35 @@
 MEMORY
 {
-  ROM: start=$8000, size=$8000, type=ro, define=yes, fill=yes, file=%O;
+  ZP:  start = $0,    size = $100,  type = rw, define = yes;
+  RAM: start = $0200, size = $7D00, type = rw, define = yes;
+  ROM: start = $8000, size = $8000, fill = yes, fillval = $ff, file = %O;
 }
 
-SEGMENTS
-{
+SEGMENTS {
+    ZEROPAGE: load = ZP,  type = zp,  define   = yes;
+    DATA:     load = ROM, type = rw,  define   = yes, run = RAM;
+    BSS:      load = RAM, type = bss, define   = yes;
+    HEAP:     load = RAM, type = bss, optional = yes;
+    STARTUP:  load = ROM, type = ro;
+    ONCE:     load = ROM, type = ro,  optional = yes;
     CODE:     load = ROM, type = ro;
-  VECTORS: load=ROM, type=ro, offset=$7ffa;
+    RODATA:   load = ROM, type = ro;
+    VECTORS:  load = ROM, type = ro,  start    = $FFFA;
+}
+
+FEATURES {
+    CONDES:    segment = STARTUP,
+               type    = constructor,
+               label   = __CONSTRUCTOR_TABLE__,
+               count   = __CONSTRUCTOR_COUNT__;
+    CONDES:    segment = STARTUP,
+               type    = destructor,
+               label   = __DESTRUCTOR_TABLE__,
+               count   = __DESTRUCTOR_COUNT__;
+}
+
+SYMBOLS {
+    # Define the stack size for the application
+    __STACKSIZE__:  value = $0200, type = weak;
+    __STACKSTART__: type = weak, value = $0800; # 2k stack
 }

sw/main.S

@@ -1,10 +0,0 @@
-          .setcpu "6502"
-          .segment "VECTORS"
-
-          .word   loop
-          .word   loop
-          .word   loop
-
-          .code
-loop:     lda #$12
-          jmp loop

sw/main.c

@@ -0,0 +1,4 @@
+
+int main() {
+    return 1;
+}