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Load a very simple ELF and launch it in usermode

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This commit is contained in:
Jeremy Soller 2016-09-07 21:16:30 -06:00
parent 398838dc1b
commit 850792bbf1
11 changed files with 201 additions and 59 deletions
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37
arch/x86_64/src/interrupt/syscall.rs
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@ -1,22 +1,29 @@
#[naked]
pub unsafe extern fn syscall() {
extern {
fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize) -> usize;
#[inline(never)]
unsafe fn inner() {
extern {
fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize) -> usize;
}
let mut a;
{
let b;
let c;
let d;
let e;
let f;
asm!("xchg bx, bx" : "={rax}"(a), "={rbx}"(b), "={rcx}"(c), "={rdx}"(d), "={rsi}"(e), "={rdi}"(f)
: : : "intel", "volatile");
a = syscall(a, b, c, d, e, f);
}
asm!("xchg bx, bx" : : "{rax}"(a) : : "intel", "volatile");
}
let a;
let b;
let c;
let d;
let e;
let f;
asm!("" : "={rax}"(a), "={rbx}"(b), "={rcx}"(c), "={rdx}"(d), "={rsi}"(e), "={rdi}"(f)
: : : "intel", "volatile");
inner();
let a = syscall(a, b, c, d, e, f);
asm!("" : : "{rax}"(a) : : "intel", "volatile");
// Pop scratch registers, error code, and return
// Interrupt return
asm!("iretq" : : : : "intel", "volatile");
}