From ef88f0e530b898ebcb14f9e3dff1d58e83089ada Mon Sep 17 00:00:00 2001 From: user Date: Thu, 16 Jul 2026 00:49:58 +0200 Subject: C toolchain: run SDCC-compiled C programs as gbos processes - c/{gbos.h,crt0.s,libc.s,build.sh}: SDCC sm83 -> ROM-bank blob toolchain. libc syscall wrappers save/restore BC/DE/HL around rst $30 (trap clobbers them; SDCC expects them preserved). - build via SDCC native asxxxx path (sdasgb/sdldgb), crt0 linked first so _start is the $4000 entry; blob INCBIN'd into a ROM bank. - chello.c: prints a message + getpid() -> runs as 'chello' shell command. - Makefile: auto-build c/*.bin, track as a dep of programs.o; gitignore blobs. - README: document the C toolchain + the SDCC --asm=rgbds codegen bug that forced the native-toolchain approach. - verified: '$ chello' -> 'hello from C on gbos!' / 'my pid is 2'. --- include/gbos.inc | 1 + 1 file changed, 1 insertion(+) (limited to 'include/gbos.inc') diff --git a/include/gbos.inc b/include/gbos.inc index f398c12..9f6a98a 100644 --- a/include/gbos.inc +++ b/include/gbos.inc @@ -92,5 +92,6 @@ DEF SYS_MAX EQU 12 DEF PROG_WORKER EQU 0 DEF PROG_SH EQU 1 DEF PROG_HELLO EQU 2 +DEF PROG_CHELLO EQU 3 ; a C program (compiled with SDCC), see c/ ENDC -- cgit v1.3.1-sl0p