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.
54 lines
1.3 KiB
Rust
54 lines
1.3 KiB
Rust
use core::mem;
|
|
use syscall::{data::Map, flag::MapFlags, number::SYS_FMAP};
|
|
|
|
pub const USERMODE_END: usize = 0x0000_8000_0000_0000;
|
|
pub const STACK_START: usize = USERMODE_END - syscall::KERNEL_METADATA_SIZE - STACK_SIZE;
|
|
|
|
const STACK_SIZE: usize = 64 * 1024; // 64 KiB
|
|
static MAP: Map = Map {
|
|
offset: 0,
|
|
size: STACK_SIZE,
|
|
flags: MapFlags::PROT_READ
|
|
.union(MapFlags::PROT_WRITE)
|
|
.union(MapFlags::MAP_PRIVATE)
|
|
.union(MapFlags::MAP_FIXED_NOREPLACE),
|
|
address: STACK_START, // highest possible user address
|
|
};
|
|
|
|
core::arch::global_asm!(
|
|
"
|
|
.globl _start
|
|
_start:
|
|
// Setup a stack.
|
|
ldr x8, ={number}
|
|
ldr x0, ={fd}
|
|
ldr x1, ={map} // pointer to Map struct
|
|
ldr x2, ={map_size} // size of Map struct
|
|
svc 0
|
|
|
|
// Failure if return value is zero
|
|
cbz x0, 1f
|
|
|
|
// Failure if return value is negative
|
|
tbnz x0, 63, 1f
|
|
|
|
// Set up stack frame
|
|
mov sp, x0
|
|
add sp, sp, #{stack_size}
|
|
mov fp, sp
|
|
|
|
// Stack has the same alignment as `size`.
|
|
bl start
|
|
// `start` must never return.
|
|
|
|
// failure, emit undefined instruction
|
|
1:
|
|
udf #0
|
|
",
|
|
fd = const usize::MAX, // dummy fd indicates anonymous map
|
|
map = sym MAP,
|
|
map_size = const mem::size_of::<Map>(),
|
|
number = const SYS_FMAP,
|
|
stack_size = const STACK_SIZE,
|
|
);
|