mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-16 07:35:40 +00:00
222 lines
7.4 KiB
Rust
222 lines
7.4 KiB
Rust
/// NOTE: These syscalls only support wasm_32 for now because they take u32 offset
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use libc::{
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c_int, c_long, getenv, getgrnam as libc_getgrnam, getpwnam as libc_getpwnam, putenv, setenv,
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sysconf, unsetenv,
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};
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use std::ffi::CStr;
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use std::mem;
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use std::os::raw::c_char;
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use super::utils::{allocate_on_stack, copy_cstr_into_wasm, copy_terminated_array_of_cstrs};
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use wasmer_runtime::{types::Value, Instance};
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//use super::EmscriptenData;
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//impl Instance {
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// pub fn memory_offset_addr(&self, index: usize, offset: usize) -> *const usize {
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// unimplemented!("TODO replace this stub")
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// }
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//
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// pub fn emscripten_data(&self) -> &'static mut Option<EmscriptenData> {
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// unimplemented!("TODO replace this stub")
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// }
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//}
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// #[no_mangle]
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/// emscripten: _getenv // (name: *const char) -> *const c_char;
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pub extern "C" fn _getenv(name: c_int, instance: &mut Instance) -> u32 {
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debug!("emscripten::_getenv");
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let name_addr = instance.memory_offset_addr(0, name as usize) as *const c_char;
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debug!("=> name({:?})", unsafe { CStr::from_ptr(name_addr) });
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let c_str = unsafe { getenv(name_addr) };
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if c_str.is_null() {
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return 0;
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}
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unsafe { copy_cstr_into_wasm(instance, c_str) }
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}
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/// emscripten: _setenv // (name: *const char, name: *const value, overwrite: int);
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pub extern "C" fn _setenv(name: c_int, value: c_int, overwrite: c_int, instance: &mut Instance) {
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debug!("emscripten::_setenv");
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let name_addr = instance.memory_offset_addr(0, name as usize) as *const c_char;
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let value_addr = instance.memory_offset_addr(0, value as usize) as *const c_char;
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debug!("=> name({:?})", unsafe { CStr::from_ptr(name_addr) });
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debug!("=> value({:?})", unsafe { CStr::from_ptr(value_addr) });
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unsafe { setenv(name_addr, value_addr, overwrite) };
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}
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/// emscripten: _putenv // (name: *const char);
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pub extern "C" fn _putenv(name: c_int, instance: &mut Instance) {
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debug!("emscripten::_putenv");
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let name_addr = instance.memory_offset_addr(0, name as usize) as *const c_char;
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debug!("=> name({:?})", unsafe { CStr::from_ptr(name_addr) });
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unsafe { putenv(name_addr as _) };
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}
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/// emscripten: _unsetenv // (name: *const char);
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pub extern "C" fn _unsetenv(name: c_int, instance: &mut Instance) {
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debug!("emscripten::_unsetenv");
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let name_addr = instance.memory_offset_addr(0, name as usize) as *const c_char;
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debug!("=> name({:?})", unsafe { CStr::from_ptr(name_addr) });
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unsafe { unsetenv(name_addr) };
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}
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#[allow(clippy::cast_ptr_alignment)]
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pub extern "C" fn _getpwnam(name_ptr: c_int, instance: &mut Instance) -> c_int {
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debug!("emscripten::_getpwnam {}", name_ptr);
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#[repr(C)]
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struct GuestPasswd {
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pw_name: u32,
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pw_passwd: u32,
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pw_uid: u32,
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pw_gid: u32,
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pw_gecos: u32,
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pw_dir: u32,
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pw_shell: u32,
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}
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let name = unsafe {
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let memory_name_ptr = instance.memory_offset_addr(0, name_ptr as usize) as *const c_char;
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CStr::from_ptr(memory_name_ptr)
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};
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unsafe {
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let passwd = &*libc_getpwnam(name.as_ptr());
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let passwd_struct_offset = call_malloc(mem::size_of::<GuestPasswd>() as _, instance);
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let passwd_struct_ptr =
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instance.memory_offset_addr(0, passwd_struct_offset as _) as *mut GuestPasswd;
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(*passwd_struct_ptr).pw_name = copy_cstr_into_wasm(instance, passwd.pw_name);
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(*passwd_struct_ptr).pw_passwd = copy_cstr_into_wasm(instance, passwd.pw_passwd);
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(*passwd_struct_ptr).pw_gecos = copy_cstr_into_wasm(instance, passwd.pw_gecos);
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(*passwd_struct_ptr).pw_dir = copy_cstr_into_wasm(instance, passwd.pw_dir);
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(*passwd_struct_ptr).pw_shell = copy_cstr_into_wasm(instance, passwd.pw_shell);
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(*passwd_struct_ptr).pw_uid = passwd.pw_uid;
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(*passwd_struct_ptr).pw_gid = passwd.pw_gid;
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passwd_struct_offset as c_int
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}
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}
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#[allow(clippy::cast_ptr_alignment)]
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pub extern "C" fn _getgrnam(name_ptr: c_int, instance: &mut Instance) -> c_int {
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debug!("emscripten::_getgrnam {}", name_ptr);
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#[repr(C)]
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struct GuestGroup {
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gr_name: u32,
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gr_passwd: u32,
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gr_gid: u32,
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gr_mem: u32,
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}
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let name = unsafe {
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let memory_name_ptr = instance.memory_offset_addr(0, name_ptr as usize) as *const c_char;
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CStr::from_ptr(memory_name_ptr)
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};
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unsafe {
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let group = &*libc_getgrnam(name.as_ptr());
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let group_struct_offset = call_malloc(mem::size_of::<GuestGroup>() as _, instance);
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let group_struct_ptr =
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instance.memory_offset_addr(0, group_struct_offset as _) as *mut GuestGroup;
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(*group_struct_ptr).gr_name = copy_cstr_into_wasm(instance, group.gr_name);
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(*group_struct_ptr).gr_passwd = copy_cstr_into_wasm(instance, group.gr_passwd);
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(*group_struct_ptr).gr_gid = group.gr_gid;
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(*group_struct_ptr).gr_mem = copy_terminated_array_of_cstrs(instance, group.gr_mem);
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group_struct_offset as c_int
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}
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}
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pub fn call_malloc(size: i32, instance: &mut Instance) -> u32 {
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let ret = instance
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.call("_malloc", &[Value::I32(size)])
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.expect("_malloc call failed");
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if let Some(Value::I32(ptr)) = ret {
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ptr as u32
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} else {
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panic!("unexpected value from _malloc: {:?}", ret);
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}
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}
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pub fn call_memalign(alignment: u32, size: u32, instance: &mut Instance) -> u32 {
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let ret = instance
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.call(
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"_memalign",
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&[Value::I32(alignment as i32), Value::I32(size as i32)],
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)
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.expect("_memalign call failed");
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if let Some(Value::I32(res)) = ret {
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res as u32
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} else {
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panic!("unexpected value from _memalign {:?}", ret);
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}
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}
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pub fn call_memset(pointer: u32, value: i32, size: u32, instance: &mut Instance) -> u32 {
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let ret = instance
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.call(
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"_memset",
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&[
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Value::I32(pointer as i32),
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Value::I32(value),
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Value::I32(size as i32),
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],
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)
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.expect("_memset call failed");
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if let Some(Value::I32(res)) = ret {
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res as u32
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} else {
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panic!("unexpected value from _memset {:?}", ret);
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}
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}
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pub extern "C" fn _getpagesize() -> u32 {
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debug!("emscripten::_getpagesize");
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16384
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}
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#[allow(clippy::cast_ptr_alignment)]
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pub extern "C" fn ___build_environment(environ: c_int, instance: &mut Instance) {
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debug!("emscripten::___build_environment {}", environ);
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const MAX_ENV_VALUES: u32 = 64;
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const TOTAL_ENV_SIZE: u32 = 1024;
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let mut environment = instance.memory_offset_addr(0, environ as _) as *mut c_int;
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unsafe {
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let (pool_offset, _pool_slice): (u32, &mut [u8]) =
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allocate_on_stack(TOTAL_ENV_SIZE as u32, instance);
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let (env_offset, _env_slice): (u32, &mut [u8]) =
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allocate_on_stack((MAX_ENV_VALUES * 4) as u32, instance);
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let mut env_ptr = instance.memory_offset_addr(0, env_offset as _) as *mut c_int;
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let mut _pool_ptr = instance.memory_offset_addr(0, pool_offset as _) as *mut c_int;
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*env_ptr = pool_offset as i32;
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*environment = env_offset as i32;
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// *env_ptr = 0;
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};
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// unsafe {
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// *env_ptr = 0;
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// };
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}
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pub extern "C" fn _sysconf(name: c_int, _instance: &mut Instance) -> c_long {
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debug!("emscripten::_sysconf {}", name);
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// TODO: Implement like emscripten expects regarding memory/page size
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unsafe { sysconf(name) }
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}
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