vasilito
8acc73d774
Phase 1 (Runtime Substrate): 4 check binaries, --probe, POSIX tests Phase 2 (Wayland Compositor): bounded scaffold, zero warnings Phase 3 (KWin Session): preflight checker (KWin stub, gated on Qt6Quick) Phase 4 (KDE Plasma): 18 KF6 enabled, preflight checker Phase 5 (Hardware GPU): DRM/firmware/Mesa preflight checker Build: zero warnings, all scripts syntax-clean. Oracle-verified.
87 lines
2.7 KiB
Rust
87 lines
2.7 KiB
Rust
use syscall::flag::MapFlags;
|
|
|
|
mod offsets {
|
|
unsafe extern "C" {
|
|
// text (R-X)
|
|
static __text_start: u8;
|
|
static __text_end: u8;
|
|
// rodata (R--)
|
|
static __rodata_start: u8;
|
|
static __rodata_end: u8;
|
|
// data+bss (RW-)
|
|
static __data_start: u8;
|
|
static __bss_end: u8;
|
|
}
|
|
pub fn text() -> (usize, usize) {
|
|
unsafe {
|
|
(
|
|
&__text_start as *const u8 as usize,
|
|
&__text_end as *const u8 as usize,
|
|
)
|
|
}
|
|
}
|
|
pub fn rodata() -> (usize, usize) {
|
|
unsafe {
|
|
(
|
|
&__rodata_start as *const u8 as usize,
|
|
&__rodata_end as *const u8 as usize,
|
|
)
|
|
}
|
|
}
|
|
pub fn data_and_bss() -> (usize, usize) {
|
|
unsafe {
|
|
(
|
|
&__data_start as *const u8 as usize,
|
|
&__bss_end as *const u8 as usize,
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn start() -> ! {
|
|
// Remap self, from the previous RWX
|
|
|
|
let (text_start, text_end) = offsets::text();
|
|
let (rodata_start, rodata_end) = offsets::rodata();
|
|
let (data_start, data_end) = offsets::data_and_bss();
|
|
|
|
// NOTE: Assuming the debug scheme root fd is always placed at this position
|
|
let debug_fd = syscall::UPPER_FDTBL_TAG + syscall::data::GlobalSchemes::Debug as usize;
|
|
let _ = syscall::openat(debug_fd, "", syscall::O_RDONLY, 0); // stdin
|
|
let _ = syscall::openat(debug_fd, "", syscall::O_WRONLY, 0); // stdout
|
|
let _ = syscall::openat(debug_fd, "", syscall::O_WRONLY, 0); // stderr
|
|
|
|
unsafe {
|
|
let _ = syscall::mprotect(4096, 4096, MapFlags::PROT_READ | MapFlags::MAP_PRIVATE)
|
|
.expect("mprotect failed for initfs header page");
|
|
|
|
let _ = syscall::mprotect(
|
|
text_start,
|
|
text_end - text_start,
|
|
MapFlags::PROT_READ | MapFlags::PROT_EXEC | MapFlags::MAP_PRIVATE,
|
|
)
|
|
.expect("mprotect failed for .text");
|
|
let _ = syscall::mprotect(
|
|
rodata_start,
|
|
rodata_end - rodata_start,
|
|
MapFlags::PROT_READ | MapFlags::MAP_PRIVATE,
|
|
)
|
|
.expect("mprotect failed for .rodata");
|
|
let _ = syscall::mprotect(
|
|
data_start,
|
|
data_end - data_start,
|
|
MapFlags::PROT_READ | MapFlags::PROT_WRITE | MapFlags::MAP_PRIVATE,
|
|
)
|
|
.expect("mprotect failed for .data/.bss");
|
|
let _ = syscall::mprotect(
|
|
data_end,
|
|
crate::arch::STACK_START - data_end,
|
|
MapFlags::PROT_READ | MapFlags::MAP_PRIVATE,
|
|
)
|
|
.expect("mprotect failed for rest of memory");
|
|
}
|
|
|
|
crate::exec::main();
|
|
}
|