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| author | user <user@clank> | 2026-07-16 00:49:58 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-16 00:49:58 +0200 |
| commit | ef88f0e530b898ebcb14f9e3dff1d58e83089ada (patch) | |
| tree | 4b4e70fb12a92e5e254a8c937fbda34316141d54 /src | |
| parent | shell working: fix syscall ABI (trap clobbers HL) + document (diff) | |
| download | gbos-ef88f0e530b898ebcb14f9e3dff1d58e83089ada.tar.gz gbos-ef88f0e530b898ebcb14f9e3dff1d58e83089ada.tar.xz gbos-ef88f0e530b898ebcb14f9e3dff1d58e83089ada.zip | |
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'.
Diffstat (limited to 'src')
| -rw-r--r-- | src/programs.asm | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/programs.asm b/src/programs.asm index d4ae89f..eabe56f 100644 --- a/src/programs.asm +++ b/src/programs.asm @@ -45,6 +45,15 @@ ProgHello: .msgend ; ----------------------------------------------------------------------------- +; PROG_CHELLO (bank 5) - a program written in C, compiled with SDCC to a +; self-contained ROM-bank image (crt0 + libc + code) and included verbatim. +; Rebuild with: sh c/build.sh c/chello.c c/chello.bin +; ----------------------------------------------------------------------------- +SECTION "prog_chello", ROMX[$4000], BANK[5] +ProgChello: + INCBIN "c/chello.bin" + +; ----------------------------------------------------------------------------- ; PROG_SH (bank 3) - a tiny shell. ; prompt -> read a line (with echo) -> match a command -> fork+exec+wait. ; ----------------------------------------------------------------------------- @@ -138,6 +147,8 @@ ProgSh: db PROG_WORKER db "hello", 0 db PROG_HELLO + db "chello", 0 + db PROG_CHELLO db 0 ; terminator ; ----------------------------------------------------------------------------- @@ -178,3 +189,5 @@ ProgramTable:: dw ProgSh db LOW(BANK(ProgHello)), HIGH(BANK(ProgHello)) dw ProgHello + db LOW(BANK(ProgChello)), HIGH(BANK(ProgChello)) + dw ProgChello |