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Add arch context, WIP switching

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This commit is contained in:
Jeremy Soller 2016-08-22 19:56:35 -06:00
commit f6e57ff5d1
1 changed files with 84 additions and 3 deletions
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72
arch/x86_64/src/context.rs Normal file
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pub struct Context {
flags: usize,
bx: usize,
r12: usize,
r13: usize,
r14: usize,
r15: usize,
bp: usize,
sp: usize,
cr3: usize
}
impl Context {
pub fn new() -> Context {
Context {
flags: 0,
bx: 0,
r12: 0,
r13: 0,
r14: 0,
r15: 0,
bp: 0,
sp: 0,
cr3: 0
}
}
#[inline(never)]
#[naked]
pub unsafe fn switch_to(&mut self, next: &mut Context) {
asm!("xchg bx, bx" : : : "memory" : "intel", "volatile");
/*
asm!("fxsave [$0]" : : "r"(self.fx) : "memory" : "intel", "volatile");
self.loadable = true;
if next.loadable {
asm!("fxrstor [$0]" : : "r"(next.fx) : "memory" : "intel", "volatile");
}else{
asm!("fninit" : : : "memory" : "intel", "volatile");
}
*/
asm!("pushfq ; pop $0" : "=r"(self.flags) : : "memory" : "intel", "volatile");
asm!("push $0 ; popfq" : : "r"(next.flags) : "memory" : "intel", "volatile");
asm!("mov $0, rbx" : "=r"(self.bx) : : "memory" : "intel", "volatile");
asm!("mov rbx, $0" : : "r"(next.bx) : "memory" : "intel", "volatile");
asm!("mov $0, r12" : "=r"(self.r12) : : "memory" : "intel", "volatile");
asm!("mov r12, $0" : : "r"(next.r12) : "memory" : "intel", "volatile");
asm!("mov $0, r13" : "=r"(self.r13) : : "memory" : "intel", "volatile");
asm!("mov r13, $0" : : "r"(next.r13) : "memory" : "intel", "volatile");
asm!("mov $0, r14" : "=r"(self.r14) : : "memory" : "intel", "volatile");
asm!("mov r14, $0" : : "r"(next.r14) : "memory" : "intel", "volatile");
asm!("mov $0, r15" : "=r"(self.r15) : : "memory" : "intel", "volatile");
asm!("mov r15, $0" : : "r"(next.r15) : "memory" : "intel", "volatile");
asm!("mov $0, rbp" : "=r"(self.bp) : : "memory" : "intel", "volatile");
asm!("mov rbp, $0" : : "r"(next.bp) : "memory" : "intel", "volatile");
asm!("mov $0, rsp" : "=r"(self.sp) : : "memory" : "intel", "volatile");
asm!("mov rsp, $0" : : "r"(next.sp) : "memory" : "intel", "volatile");
/* TODO
asm!("mov $0, cr3" : "=r"(self.cr3) : : "memory" : "intel", "volatile");
asm!("mov cr3, $0" : : "r"(self.cr3) : "memory" : "intel", "volatile");
*/
}
}