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Add exehdr

This commit is contained in:
Karri Kaksonen 2022-03-01 09:28:15 +02:00
parent b861f6df8f
commit d679faaf22
2 changed files with 27 additions and 6 deletions
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26
cfg/atari7800.cfg
View File

@ -2,6 +2,16 @@
SYMBOLS {
__STACKSIZE__: type = weak, value = $0010; # 16 bytes stack
__EXEHDR__: type = import;
__VEC_BOTTOM__: value = $fffa, type = export;
__VEC_SIZE__: value = $6, type = export;
__ENCRYPT_BOTTOM__: value = $ff7a, type = export;
__ENCRYPT_SIZE__: value = $80, type = export;
__MEMORY_TOP__: value = __ENCRYPT_BOTTOM__, type = export;
__INIT_SIZE__: value = 69, type = export;
__MEMORY_INIT__: value = __MEMORY_TOP__ - __INIT_SIZE__, type = export;
__MEMORY_BOTTOM__: value = $8000, type = export;
__FREE_ROM_SIZE__: value = __MEMORY_INIT__ - __MEMORY_BOTTOM__, type = export;
}
MEMORY {
@ -10,27 +20,31 @@ MEMORY {
RAM1: file = "", define = yes, start = $1800, size = $0840, type = rw;
RAM2: file = "", define = yes, start = $2100, size = $0040, type = rw;
RAM3: file = "", define = yes, start = $2200, size = $0600, type = rw;
# For emulators you also need a header file
HEADER: file = %O, start = $0000, size = 128;
# "Normal" cartridge rom. Multiple banks arent supported
# by this script. You may change the rom size, but keep
# two things in mind:
# - start must be a multiple of $1000
# - ROM must end at $ff79
ROM: file = %O, define = yes, start = $8000, size = $7f7a, type = ro, fill = yes, fillval = $ff;
ROM: file = %O, define = yes, start = __MEMORY_BOTTOM__, size = __FREE_ROM_SIZE__, type = ro, fill = yes, fillval = $ff;
ROMS: file = %O, define = yes, start = __MEMORY_INIT__, size = __INIT_SIZE__, type = ro, fill = yes, fillval = $ff;
# Encryption stuff
ROME: file = %O, start = $ff7a, size = $80, type = ro, fill = yes, fillval = $ff;
ROME: file = %O, start = __ENCRYPT_BOTTOM__, size = __ENCRYPT_SIZE__, type = ro, fill = yes, fillval = $ff;
# Interrupt vectors
ROMV: file = %O, start = $fffa, size = $6, type = ro, fill = yes, fillval = $ff;
ROMV: file = %O, start = __VEC_BOTTOM__, size = __VEC_SIZE__, type = ro, fill = yes, fillval = $ff;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
STARTUP: load = ROM, type = ro, define = yes;
ONCE: load = ROM, type = ro, define = yes;
EXEHDR: load = HEADER, type = ro, define = yes;
STARTUP: load = ROMS, type = ro, define = yes;
ONCE: load = ROMS, type = ro, define = yes;
CODE: load = ROM, type = ro, define = yes;
RODATA: load = ROM, type = ro, define = yes, align = 256;
DATA: load = ROM, run = RAM1, type = rw, define = yes;
BSS: load = RAM1, type = bss, define = yes;
VECTORS: load = ROM, type = ro, define = yes;
VECTORS: load = ROMV, type = ro, define = yes;
ENCRYPTION: load = ROME, type = ro define = yes;
}

7
libsrc/atari7800/exehdr.s
View File

@ -1,3 +1,10 @@
;
; Karri Kaksonen, 2022
;
; This header contains data for emulators
;
.export __EXEHDR__: absolute = 1
; ------------------------------------------------------------------------
; EXE header
.segment "EXEHDR"