diff options
| author | user <user@clank> | 2026-07-16 07:21:40 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-16 07:21:40 +0200 |
| commit | 4335d248d18987a050d8ac26965c90718eef7562 (patch) | |
| tree | e05038b2a21209281fd1c849c30145da9b7d77bc /c/crt0.s | |
| parent | C toolchain: run SDCC-compiled C programs as gbos processes (diff) | |
| download | gbos-4335d248d18987a050d8ac26965c90718eef7562.tar.gz gbos-4335d248d18987a050d8ac26965c90718eef7562.tar.xz gbos-4335d248d18987a050d8ac26965c90718eef7562.zip | |
libc + CLI tools: a small C userland
- libc: add putc, puts, strlen, getargs (args string), EOF (=4) for readc.
- args: shell splits the command line at the first space ("cmd\0args\0" at
$A000, inherited by the child via fork); getargs() returns the arg string.
- shell: exit on Ctrl-D/EOF; $ prompt over a clean read loop.
- tools (c/): echo (argv), cat (stdin->stdout to EOF), uname, pid (decimal
print), true, false. Each built to a ROM-bank blob and registered.
- Makefile: CBLOBS list builds all C programs.
- README: document libc + the tool set.
Diffstat (limited to 'c/crt0.s')
| -rw-r--r-- | c/crt0.s | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -1,11 +1,11 @@ .module crt0 .globl _main - ;; gbos C entry. exec() maps our ROM bank and jumps to the start of _CODE - ;; (linked at 0x4000). Call main(), then exit(0). exec() already set SP. + ;; gbos C entry. exec() maps our ROM bank and jumps here ($4000). + ;; Call main(), then exit(0). (Args are fetched on demand via getargs().) .area _CODE _start:: call _main ld b, #0 - ld c, #0 ; SYS_EXIT + ld c, #0 ; SYS_EXIT rst #0x30 1$: jr 1$ |