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Add a C shell, which currently just passes through

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This is a first step toward moving the UI to C and
adding file and network I/O in C. The fractal core
will remain in assembler as well as the multiplier.
This commit is contained in:
Brooke Vibber 2025-12-28 09:23:38 -08:00
commit b27be3c159
5 changed files with 89 additions and 6 deletions
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atari-xex.cfg Normal file
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# Sample linker configuration for C programs using the Atari binary file support.
# Use with: cl65 -tatari -Catari-xex.cfg prog.c -o prog.xex
FEATURES {
STARTADDRESS: default = $2000;
}
SYMBOLS {
__SYSTEM_CHECK__: type = import; # force inclusion of "system check" load chunk
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTADDRESS__: type = export, value = %S;
__RESERVED_MEMORY__: type = weak, value = $0000;
__SYSCHKHDR__: type = export, value = 0; # Disable system check header
__SYSCHKTRL__: type = export, value = 0; # Disable system check trailer
}
MEMORY {
ZP: file = "", define = yes, start = $0082, size = $007E;
# "system check" load chunk
SYSCHKCHNK: file = %O, start = $2E00, size = $0300;
# "main program" load chunk
# Note we reserve $4000-7fff for the bank-switch window.
#MAIN: file = %O, define = yes, start = %S, size = $BC20 - __STACKSIZE__ - __RESERVED_MEMORY__ - %S;
MAIN: file = %O, define = yes, start = %S, size = $4000 - __STACKSIZE__ - __RESERVED_MEMORY__ - %S;
# Note $a000-$bfff is against the BASIC cartridge, may require booting with OPTION.
TABLES: file = %O, define = yes, start = $8000, size = $a000 - $8000;
}
FILES {
%O: format = atari;
}
FORMATS {
atari: runad = start,
initad = SYSCHKCHNK: __SYSTEM_CHECK__;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
EXTZP: load = ZP, type = zp, optional = yes;
SYSCHK: load = SYSCHKCHNK, type = rw, define = yes, optional = yes;
STARTUP: load = MAIN, type = ro, define = yes;
LOWBSS: load = MAIN, type = rw, optional = yes; # not zero initialized
LOWCODE: load = MAIN, type = ro, define = yes, optional = yes;
ONCE: load = MAIN, type = ro, optional = yes;
CODE: load = MAIN, type = ro, define = yes;
RODATA: load = MAIN, type = ro;
DATA: load = MAIN, type = rw;
INIT: load = MAIN, type = rw, optional = yes;
BSS: load = MAIN, type = bss, define = yes;
TABLES: load = TABLES, type = ro, optional = yes, align = 256;
}
FEATURES {
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = ONCE;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
import = __CALLIRQ__;
}