megadrive_test1
annotate megadrive.ldscript @ 4:e7138066c7ea
started the vdp.h header, and hastily rewrote the VDP test as C code
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Wed, 01 Feb 2017 13:40:50 +0200 |
| parents | 9e7f64c4fe7a |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 OUTPUT_ARCH(m68k) |
| nuclear@0 | 2 |
| nuclear@0 | 3 MEMORY |
| nuclear@0 | 4 { |
| nuclear@0 | 5 rom : ORIGIN = 0x00000000, LENGTH = 0x00a00000 |
| nuclear@0 | 6 ram : ORIGIN = 0x00ff0000, LENGTH = 0x00010000 |
| nuclear@0 | 7 } |
| nuclear@0 | 8 |
| nuclear@0 | 9 PROVIDE (_stacktop = 0x01000000); |
| nuclear@0 | 10 |
| nuclear@0 | 11 SECTIONS { |
| nuclear@0 | 12 /* ---- start of ROM ---- */ |
| nuclear@0 | 13 /* .vect section is used to place the m68k exception vectors at the |
| nuclear@0 | 14 * beginning of the address space |
| nuclear@0 | 15 */ |
| nuclear@1 | 16 .vect : { * (.vect); } >rom |
| nuclear@0 | 17 /* .romhdr section is used to place the SEGA ROM header at 0x100 */ |
| nuclear@0 | 18 . = 0x100; |
| nuclear@1 | 19 .romhdr : { * (.romhdr); } >rom |
| nuclear@0 | 20 .text : { * (.text); } >rom |
| nuclear@0 | 21 .rodata : { * (.rodata); } >rom |
| nuclear@0 | 22 |
| nuclear@0 | 23 /* place the load address of the .data section after .rodata */ |
| nuclear@3 | 24 . = ALIGN(4); |
| nuclear@0 | 25 _data_lma = .; |
| nuclear@0 | 26 _rom_end = _data_lma + _data_size; |
| nuclear@0 | 27 |
| nuclear@0 | 28 /* ---- start of RAM ---- */ |
| nuclear@0 | 29 . = 0xff0000; |
| nuclear@0 | 30 /* place the .data section at the start of RAM */ |
| nuclear@3 | 31 .data ALIGN(4): AT (_data_lma) { |
| nuclear@0 | 32 _data_start = .; |
| nuclear@0 | 33 * (.data); |
| nuclear@3 | 34 . = ALIGN(4); |
| nuclear@0 | 35 _data_end = .; |
| nuclear@0 | 36 } >ram |
| nuclear@0 | 37 _data_size = SIZEOF(.data); |
| nuclear@0 | 38 |
| nuclear@0 | 39 /* place the .bss section at the end */ |
| nuclear@3 | 40 .bss ALIGN(4): { |
| nuclear@0 | 41 _bss_start = .; |
| nuclear@0 | 42 * (.bss); |
| nuclear@3 | 43 . = ALIGN(4); |
| nuclear@0 | 44 _bss_end = .; |
| nuclear@0 | 45 } >ram |
| nuclear@0 | 46 _bss_size = SIZEOF(.bss); |
| nuclear@0 | 47 } |