targets: add support for GameBoy Advance

Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
2026-08-21 04:49:04 +00:00 · 2019-08-01 15:25:09 +02:00
parent 9878f7ebc4
commit 9846c062b3
7 changed files with 301 additions and 0 deletions
@@ -0,0 +1,72 @@
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+
+MEMORY {
+    ewram   : ORIGIN = 0x02000000, LENGTH = 256K /* on-board work RAM (2 wait states) */
+    iwram   : ORIGIN = 0x03000000, LENGTH = 32K  /* in-chip work RAM (faster) */
+    rom     : ORIGIN = 0x08000000, LENGTH = 32M  /* flash ROM */
+}
+
+__iwram_top = ORIGIN(iwram) + LENGTH(iwram);;
+_stack_size = 3K;
+__sp_irq    = _stack_top;
+__sp_usr    = _stack_top - 1K;
+
+SECTIONS
+{
+    .text :
+    {
+        KEEP (*(.init))
+        *(.text)
+        . = ALIGN(4);
+    } >rom
+
+    /* Put the stack at the bottom of RAM, so that the application will
+     * crash on stack overflow instead of silently corrupting memory.
+     * See: http://blog.japaric.io/stack-overflow-protection/ */
+    .stack :
+    {
+        . = ALIGN(4);
+        . += _stack_size;
+        _stack_top = .;
+    } >iwram
+
+    /* Start address (in flash) of .data, used by startup code. */
+    _sidata = LOADADDR(.data);
+
+    /* Globals with initial value */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* used by startup code */
+        *(.data)
+        *(.data*)
+        *(.iwram .iwram.*)
+        . = ALIGN(4);
+        _edata = .;        /* used by startup code */
+    } >iwram AT>rom
+
+    /* Zero-initialized globals  */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* used by startup code */
+        *(.bss)
+        *(.bss*)
+        *(COMMON)
+        . = ALIGN(4);
+        _ebss = .;         /* used by startup code */
+    } >iwram
+
+    /DISCARD/ :
+    {
+        *(.ARM.exidx)      /* causes 'no memory region specified' error in lld */
+        *(.ARM.exidx.*)    /* causes spurious 'undefined reference' errors */
+    }
+}
+
+/* For the memory allocator. */
+_heap_start = ORIGIN(ewram);
+_heap_end = ORIGIN(ewram) + LENGTH(ewram);
+_globals_start = _sdata;
+_globals_end = _ebss;