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Add C compatability fork()/execve()

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This commit is contained in:
Mark Poliakov 2024-01-08 18:44:06 +02:00
parent 7c965cc9ff
commit ecea7aada6
4 changed files with 146 additions and 14 deletions
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54
src/lib.rs
View File

@ -56,13 +56,53 @@ unsafe extern "C" fn memcmp(p0: *const c_void, p1: *const c_void, len: usize) ->
#[no_mangle]
unsafe extern "C" fn memcpy(p0: *mut c_void, p1: *const c_void, len: usize) -> *mut c_void {
#[cfg(feature = "rustc-dep-of-std")]
{
compiler_builtins::mem::memcpy(p0 as _, p1 as _, len) as _
}
#[cfg(not(feature = "rustc-dep-of-std"))]
{
let mut i = 0;
while i < len {
*(p0 as *mut u8).add(i) = *(p1 as *const u8).add(i);
i += 1;
}
p0
}
}
#[no_mangle]
unsafe extern "C" fn memmove(dst: *mut c_void, src: *const c_void, len: usize) -> *mut c_void {
unsafe extern "C" fn memmove(dst: *mut c_void, src: *const c_void, n: usize) -> *mut c_void {
#[cfg(feature = "compiler_builtins")]
{
compiler_builtins::mem::memmove(dst as _, src as _, len) as _
}
#[cfg(not(feature = "compiler_builtins"))]
{
let dst = dst as usize;
let src = src as usize;
if dst == src {
return dst as _;
}
if src + n <= dst || dst + n <= src {
return memcpy(dst as _, src as _, n);
}
if dst < src {
let a = src - dst;
memcpy(dst as _, src as _, a);
memcpy(src as _, (src + a) as _, n - a);
} else {
let a = dst - src;
memcpy((dst + a) as _, dst as _, n - a);
memcpy(dst as _, src as _, a);
}
dst as _
}
}
#[no_mangle]
unsafe extern "C" fn memset(dst: *mut c_void, val: i32, len: usize) -> *mut c_void {
@ -75,6 +115,14 @@ unsafe extern "C" fn memset(dst: *mut c_void, val: i32, len: usize) -> *mut c_vo
}
#[no_mangle]
unsafe extern "C" fn strlen(_s: *mut c_char) -> usize {
todo!()
unsafe extern "C" fn strlen(mut s: *mut c_char) -> usize {
if s.is_null() {
return 0;
}
let mut len = 0;
while s.read() != 0 {
len += 1;
s = s.add(1);
}
len
}

4
src/process.rs
View File

@ -1,6 +1,6 @@
//! Process management data types
pub use abi::process::{
ExitCode, MutexOperation, ProgramArgumentInner, Signal, SignalEntryData, SpawnOption,
SpawnOptions, ThreadSpawnOptions,
ExecveOptions, ExitCode, MutexOperation, ProgramArgumentInner, Signal, SignalEntryData,
SpawnOption, SpawnOptions, ThreadSpawnOptions,
};

44
src/sys/mod.rs
View File

@ -11,7 +11,8 @@ use abi::{
},
mem::MappingSource,
process::{
ExitCode, MutexOperation, Signal, SignalEntryData, SpawnOptions, ThreadSpawnOptions,
ExecveOptions, ExitCode, MutexOperation, Signal, SignalEntryData, SpawnOptions,
ThreadSpawnOptions,
},
syscall::SyscallFunction,
};
@ -626,3 +627,44 @@ pub unsafe fn create_pty(
argp!(fds as *mut _)
))
}
/// System call: clone a file descriptor into target (if provided) or some free slot (in not
/// specified).
///
/// # Safety
///
/// Unsafe: direct system call.
pub unsafe fn clone_fd(source: RawFd, target: Option<RawFd>) -> Result<RawFd, Error> {
let target = target.unwrap_or(RawFd::NONE).0;
RawFd::from_syscall_result(syscall!(
SyscallFunction::CloneFd,
argn!(source.0 as usize),
argn!(target as usize)
))
}
/// System call: create an exact copy of the process and return its PID.
///
/// # Note
///
/// This system call is part of C compatability functions.
///
/// # Safety
///
/// Unsafe: direct system call.
pub unsafe fn fork() -> Result<u32, Error> {
u32::from_syscall_result(syscall!(SyscallFunction::Fork))
}
/// System call: load a program into the current process address space.
///
/// # Note
///
/// This system call is part of C compatability functions.
///
/// # Safety
///
/// Unsafe: direct system call.
pub unsafe fn execve(opts: &ExecveOptions) -> Result<(), Error> {
<()>::from_syscall_result(syscall!(SyscallFunction::Exec, argp!(opts as *const _)))
}

54
src/sys/x86_64.rs
View File

@ -3,7 +3,19 @@
macro_rules! syscall {
($num:expr) => {{
let mut res = usize::from($num);
core::arch::asm!("syscall", inlateout("rax") res);
core::arch::asm!(
"syscall",
inlateout("rax") res,
out("rdi") _,
out("rsi") _,
out("rdx") _,
out("r10") _,
out("r8") _,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};
($num:expr, $a0:expr) => {{
@ -11,7 +23,15 @@ macro_rules! syscall {
core::arch::asm!(
"syscall",
inlateout("rax") res,
in("rdi") $a0
in("rdi") $a0,
out("rsi") _,
out("rdx") _,
out("r10") _,
out("r8") _,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};
@ -21,7 +41,14 @@ macro_rules! syscall {
"syscall",
inlateout("rax") res,
in("rdi") $a0,
in("rsi") $a1
in("rsi") $a1,
out("rdx") _,
out("r10") _,
out("r8") _,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};
@ -32,7 +59,13 @@ macro_rules! syscall {
inlateout("rax") res,
in("rdi") $a0,
in("rsi") $a1,
in("rdx") $a2
in("rdx") $a2,
out("r10") _,
out("r8") _,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};
@ -44,7 +77,12 @@ macro_rules! syscall {
in("rdi") $a0,
in("rsi") $a1,
in("rdx") $a2,
in("r10") $a3
in("r10") $a3,
out("r8") _,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};
@ -57,7 +95,11 @@ macro_rules! syscall {
in("rsi") $a1,
in("rdx") $a2,
in("r10") $a3,
in("r8") $a4
in("r8") $a4,
out("r9") _,
// Clobbered by syscall
out("rcx") _,
out("r11") _,
);
res
}};