From ef88f0e530b898ebcb14f9e3dff1d58e83089ada Mon Sep 17 00:00:00 2001
From: user <user@clank>
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'.
---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

(limited to '.gitignore')

diff --git a/.gitignore b/.gitignore
index 7d20801..bcba5ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build/
 *.gb
 *.sav
+c/*.bin
-- 
cgit v1.3.1-sl0p