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Insert trampolines to preserve callee-saved registers for backends without register save area information.

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This commit is contained in:
losfair
2019-08-15 19:10:24 -07:00
parent 0a54213d4f
commit 6a24485999
4 changed files with 68 additions and 15 deletions
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19
lib/runtime-core/src/fault.rs
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@ -1,8 +1,9 @@
mod raw {
pub mod raw {
use std::ffi::c_void;
extern "C" {
pub fn run_on_alternative_stack(stack_end: *mut u64, stack_begin: *mut u64) -> u64;
pub fn register_preservation_trampoline(); // NOT safe to call directly
pub fn setjmp(env: *mut c_void) -> i32;
pub fn longjmp(env: *mut c_void, val: i32) -> !;
}
@ -39,11 +40,27 @@ struct UnwindInfo {
payload: Option<Box<dyn Any>>, // out
}
#[repr(packed)]
#[derive(Default, Copy, Clone)]
pub struct BoundaryRegisterPreservation {
pub r15: u64,
pub r14: u64,
pub r13: u64,
pub r12: u64,
pub rbx: u64,
}
thread_local! {
static UNWIND: UnsafeCell<Option<UnwindInfo>> = UnsafeCell::new(None);
static CURRENT_CTX: UnsafeCell<*mut vm::Ctx> = UnsafeCell::new(::std::ptr::null_mut());
static CURRENT_CODE_VERSIONS: RefCell<Vec<CodeVersion>> = RefCell::new(vec![]);
static WAS_SIGINT_TRIGGERED: Cell<bool> = Cell::new(false);
static BOUNDARY_REGISTER_PRESERVATION: UnsafeCell<BoundaryRegisterPreservation> = UnsafeCell::new(BoundaryRegisterPreservation::default());
}
#[no_mangle]
pub unsafe extern "C" fn get_boundary_register_preservation() -> *mut BoundaryRegisterPreservation {
BOUNDARY_REGISTER_PRESERVATION.with(|x| x.get())
}
struct InterruptSignalMem(*mut u8);