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Add various Linux system calls and fix the double echo bug. #233

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Merged
yomaytk merged 1 commit into from
Mar 13, 2026
Merged

Add various Linux system calls and fix the double echo bug. #233

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131 changes: 130 additions & 1 deletion browser/js-kernel.js
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Original file line number Diff line number Diff line change
Expand Up @@ -981,6 +981,10 @@ var Module = (() => {
const ECV_FIFO_READ = 10006;
const ECV_FIFO_WRITE = 10007;

// emscripten-specific syscalls (not in Linux AArch64 table)
const ECV_CHMOD = 10008;
const ECV_FD_FDSTAT_GET = 10009;

SysFuncMap.set(ECV_CLONE, ___syscall_clone);
SysFuncMap.set(ECV_WAIT4, ___syscall_wait4);
SysFuncMap.set(ECV_EXECVE, ___syscall_execve);
Expand Down Expand Up @@ -1032,6 +1036,16 @@ var Module = (() => {
SysFuncMap.set(ECV_FIFO_READ, _fd_fifo_read);
SysFuncMap.set(ECV_FIFO_WRITE, _fd_fifo_write);

// new filesystem syscalls
SysFuncMap.set(ECV_CHMOD, ___syscall_chmod);
SysFuncMap.set(ECV_FCHMOD, ___syscall_fchmod);
SysFuncMap.set(ECV_FCHMODAT, ___syscall_fchmodat);
SysFuncMap.set(ECV_FCHOWNAT, ___syscall_fchownat);
SysFuncMap.set(ECV_FDATASYNC, ___syscall_fdatasync);
SysFuncMap.set(ECV_RENAMEAT, ___syscall_renameat);
SysFuncMap.set(ECV_SYMLINKAT, ___syscall_symlinkat);
SysFuncMap.set(ECV_FD_FDSTAT_GET, _fd_fdstat_get);


class ExitStatus {
name = "ExitStatus";
Expand Down Expand Up @@ -2968,19 +2982,31 @@ var Module = (() => {
["arch", "busybox"],
["ascii", "busybox"],
["basename", "busybox"],
["chmod", "busybox"],
["chown", "busybox"],
["clear", "busybox"],
["cp", "busybox"],
["date", "busybox"],
["dirname", "busybox"],
["expr", "busybox"],
["head", "busybox"],
["hostname", "busybox"],
["ln", "busybox"],
["ls", "busybox"],
["mkdir", "busybox"],
["mv", "busybox"],
["rm", "busybox"],
["rmdir", "busybox"],
["seq", "busybox"],
["sleep", "busybox"],
["tail", "busybox"],
["tree", "busybox"],
["uname", "busybox"],
["vi", "busybox"],
["cat", "busybox"],
["touch", "busybox"],
["ps", "busybox"]
["ps", "busybox"],
["wc", "busybox"]
]));
}
}
Expand Down Expand Up @@ -4613,6 +4639,109 @@ var Module = (() => {
return -e.errno
}
}
function ___syscall_chmod(path, mode) {
try {
path = SYSCALLS.getStr(path);
FS.chmod(path, mode);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_fchmod(fd, mode) {
try {
FS.fchmod(fd, mode);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_fchmodat(dirfd, path, mode, flags) {
try {
var nofollow = flags & 256;
path = SYSCALLS.getStr(path);
path = SYSCALLS.calculateAt(dirfd, path);
FS.chmod(path, mode, nofollow);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_fchownat(dirfd, path, owner, group, flags) {
try {
path = SYSCALLS.getStr(path);
var nofollow = flags & 256;
flags = flags & ~256;
path = SYSCALLS.calculateAt(dirfd, path);
(nofollow ? FS.lchown : FS.chown)(path, owner, group);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_fdatasync(fd) {
try {
var stream = SYSCALLS.getStreamFromFD(fd);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_renameat(olddirfd, oldpath, newdirfd, newpath) {
try {
oldpath = SYSCALLS.getStr(oldpath);
newpath = SYSCALLS.getStr(newpath);
oldpath = SYSCALLS.calculateAt(olddirfd, oldpath);
newpath = SYSCALLS.calculateAt(newdirfd, newpath);
FS.rename(oldpath, newpath);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function ___syscall_symlinkat(target, dirfd, linkpath) {
try {
target = SYSCALLS.getStr(target);
linkpath = SYSCALLS.getStr(linkpath);
linkpath = SYSCALLS.calculateAt(dirfd, linkpath);
FS.symlink(target, linkpath);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return -e.errno
}
}

function _fd_fdstat_get(fd, pbuf) {
try {
var rightsBase = 0;
var rightsInheriting = 0;
var flags = 0;
var stream = SYSCALLS.getStreamFromFD(fd);
var type = stream.tty ? 2 : FS.isDir(stream.mode) ? 3 : FS.isLink(stream.mode) ? 7 : 4;
(growMemViews(gWasmMemory), HEAP8)[pbuf] = type;
(growMemViews(gWasmMemory), HEAP16)[pbuf + 2 >> 1] = flags;
(growMemViews(gWasmMemory), HEAP64)[pbuf + 8 >> 3] = BigInt(rightsBase);
(growMemViews(gWasmMemory), HEAP64)[pbuf + 16 >> 3] = BigInt(rightsInheriting);
return 0
} catch (e) {
if (typeof FS == "undefined" || !(e.name === "ErrnoError")) throw e;
return e.errno
}
}

var runtimeKeepaliveCounter = 0;
var ENV = {};
var getExecutableName = () => initProcessJsPath;
Expand Down
145 changes: 95 additions & 50 deletions browser/process.js
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Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,7 @@ var Module = (() => {
}

function initRuntime() {
wasmExports["ga"]();
wasmExports["Vc"]();
}

function preMain() { }
Expand Down Expand Up @@ -326,7 +326,7 @@ var Module = (() => {

function receiveInstance(instance) {
wasmExports = instance.exports;
wasmTable = wasmExports["xc"];
wasmTable = wasmExports["Fc"];
return wasmExports
}

Expand Down Expand Up @@ -801,6 +801,10 @@ var Module = (() => {
const ECV_FIFO_READ = 10006;
const ECV_FIFO_WRITE = 10007;

// emscripten-specific syscalls (not in Linux AArch64 table)
const ECV_CHMOD = 10008;
const ECV_FD_FDSTAT_GET = 10009;

// This function assumes that emscripten JS syscall is executed synchronously.
function ecvProxySyscallJs(sysNum, ...callArgs) {

Expand Down Expand Up @@ -1131,6 +1135,39 @@ var Module = (() => {
function ___syscall_utimensat(dirfd, path, times, flags) {
return ecvProxySyscallJs(ECV_UTIMENSAT, dirfd, path, times, flags);
}

function ___syscall_chmod(path, mode) {
return ecvProxySyscallJs(ECV_CHMOD, path, mode);
}

function ___syscall_fchmod(fd, mode) {
return ecvProxySyscallJs(ECV_FCHMOD, fd, mode);
}

function ___syscall_fchmodat2(dirfd, path, mode, flags) {
return ecvProxySyscallJs(ECV_FCHMODAT, dirfd, path, mode, flags);
}

function ___syscall_fchownat(dirfd, path, owner, group, flags) {
return ecvProxySyscallJs(ECV_FCHOWNAT, dirfd, path, owner, group, flags);
}

function ___syscall_fdatasync(fd) {
return ecvProxySyscallJs(ECV_FDATASYNC, fd);
}

function ___syscall_renameat(olddirfd, oldpath, newdirfd, newpath) {
return ecvProxySyscallJs(ECV_RENAMEAT, olddirfd, oldpath, newdirfd, newpath);
}

function ___syscall_symlinkat(target, dirfd, linkpath) {
return ecvProxySyscallJs(ECV_SYMLINKAT, target, dirfd, linkpath);
}

function _fd_fdstat_get(fd, pbuf) {
return ecvProxySyscallJs(ECV_FD_FDSTAT_GET, fd, pbuf);
}

var __abort_js = () => abort("");
var runtimeKeepaliveCounter = 0;
var __emscripten_runtime_keepalive_clear = () => {
Expand Down Expand Up @@ -1530,68 +1567,76 @@ var Module = (() => {
function assignWasmImports() {
wasmImports = {
e: ___ecv_syscall_ioctl,
ea: ___syscall_clone,
da: ___syscall_execve,
ma: ___syscall_clone,
la: ___syscall_execve,
m: ___syscall_exit,
fa: ___syscall_getpgid,
y: ___syscall_pipe2,
na: ___syscall_getpgid,
F: ___syscall_pipe2,
h: ___syscall_poll,
i: ___syscall_pselect6,
p: ___syscall_sendfile,
ga: ___syscall_setpgid,
ca: ___syscall_wait4,
A: ___call_sighandler,
x: ___syscall_sendfile,
oa: ___syscall_setpgid,
ka: ___syscall_wait4,
C: ___call_sighandler,
l: ___cxa_throw,
aa: ___syscall_chdir,
_: ___syscall_dup,
Z: ___syscall_dup3,
X: ___syscall_faccessat,
ia: ___syscall_chdir,
ba: ___syscall_chmod,
ga: ___syscall_dup,
fa: ___syscall_dup3,
da: ___syscall_faccessat,
ca: ___syscall_fchmod,
aa: ___syscall_fchmodat2,
_: ___syscall_fchownat,
c: ___syscall_fcntl64,
U: ___syscall_fstat64,
P: ___syscall_ftruncate64,
O: ___syscall_getcwd,
N: ___syscall_getdents64,
Z: ___syscall_fdatasync,
W: ___syscall_fstat64,
R: ___syscall_ftruncate64,
Q: ___syscall_getcwd,
P: ___syscall_getdents64,
j: ___syscall_ioctl,
R: ___syscall_lstat64,
I: ___syscall_mkdirat,
S: ___syscall_newfstatat,
H: ___syscall_openat,
z: ___syscall_readlinkat,
T: ___syscall_stat64,
x: ___syscall_statfs64,
T: ___syscall_lstat64,
K: ___syscall_mkdirat,
U: ___syscall_newfstatat,
$: ___syscall_openat,
B: ___syscall_readlinkat,
A: ___syscall_renameat,
V: ___syscall_stat64,
z: ___syscall_statfs64,
y: ___syscall_symlinkat,
v: ___syscall_truncate64,
u: ___syscall_unlinkat,
t: ___syscall_utimensat,
ba: __abort_js,
L: __emscripten_init_main_thread_js,
ja: __abort_js,
N: __emscripten_init_main_thread_js,
w: __emscripten_notify_mailbox_postmessage,
F: __emscripten_receive_on_main_thread_js,
C: __emscripten_runtime_keepalive_clear,
I: __emscripten_receive_on_main_thread_js,
E: __emscripten_runtime_keepalive_clear,
n: __emscripten_thread_cleanup,
K: __emscripten_thread_mailbox_await,
W: __emscripten_thread_set_strongref,
M: __emscripten_thread_mailbox_await,
Y: __emscripten_thread_set_strongref,
o: __tzset_js,
$: _clock_time_get,
ha: ecv_proxy_process_memory_copy_req,
E: _emscripten_check_blocking_allowed,
Y: _emscripten_date_now,
V: _emscripten_exit_with_live_runtime,
ha: _clock_time_get,
pa: ecv_proxy_process_memory_copy_req,
H: _emscripten_check_blocking_allowed,
ea: _emscripten_date_now,
X: _emscripten_exit_with_live_runtime,
b: _emscripten_get_now,
s: _emscripten_resize_heap,
q: _environ_get,
r: _environ_sizes_get,
ia: execve_memory_copy_req,
r: _emscripten_resize_heap,
p: _environ_get,
q: _environ_sizes_get,
qa: execve_memory_copy_req,
k: _exit,
g: _fd_close,
G: _fd_pread,
D: _fd_pwrite,
s: _fd_fdstat_get,
J: _fd_pread,
G: _fd_pwrite,
f: _fd_read,
J: _fd_seek,
Q: _fd_sync,
L: _fd_seek,
S: _fd_sync,
d: _fd_write,
a: wasmMemory,
B: _proc_exit,
M: _random_get
D: _proc_exit,
O: _random_get
}
}

Expand All @@ -1600,10 +1645,10 @@ var Module = (() => {
async function initWasmInstance() {
// init Wasm module
wasmExports = await instantiateWasm();
_main = Module["_main"] = (a0, a1) => (_main = Module["_main"] = wasmExports["yc"])(a0, a1);
__emscripten_stack_restore = a0 => (__emscripten_stack_restore = wasmExports["Wc"])(a0);
__emscripten_stack_alloc = a0 => (__emscripten_stack_alloc = wasmExports["Xc"])(a0);
_emscripten_stack_get_current = () => (_emscripten_stack_get_current = wasmExports["Yc"])();
_main = Module["_main"] = (a0, a1) => (_main = Module["_main"] = wasmExports["Gc"])(a0, a1);
__emscripten_stack_restore = a0 => (__emscripten_stack_restore = wasmExports["cd"])(a0);
__emscripten_stack_alloc = a0 => (__emscripten_stack_alloc = wasmExports["dd"])(a0);
_emscripten_stack_get_current = () => (_emscripten_stack_get_current = wasmExports["ed"])();

preInit();
moduleRtn = readyPromise;
Expand Down
2 changes: 2 additions & 0 deletions runtime/syscalls/SysTable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,8 @@
// ioctls cmds (Linux)
#define _LINUX_TCGETS 0x5401
#define _LINUX_TCSETS 0x5402
#define _LINUX_TCSETSW 0x5403
#define _LINUX_TCSETSF 0x5404
#define _LINUX_TIOCGWINSZ 0x5413
#define _LINUX_TIOCGPGRP 0x540f
#define _LINUX_TIOSGPGRP 0x5410
Expand Down
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