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Make frame optional to be able to denote end-of-stack in context

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This commit is contained in:
Gary Guo 2021-08-26 02:42:55 +01:00
parent e588ffdf2e
commit 874abe87d2
1 changed files with 33 additions and 14 deletions
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47
src/abi.rs
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@ -1,3 +1,4 @@
use core::ops;
use core::ptr; use core::ptr;
use gimli::Register; use gimli::Register;
use libc::{c_int, c_void}; use libc::{c_int, c_void};
@ -29,6 +30,7 @@ pub struct UnwindAction(c_int);
#[allow(unused)] #[allow(unused)]
impl UnwindAction { impl UnwindAction {
pub const NONE: Self = Self(0);
pub const SEARCH_PHASE: Self = Self(1); pub const SEARCH_PHASE: Self = Self(1);
pub const CLEANUP_PHASE: Self = Self(2); pub const CLEANUP_PHASE: Self = Self(2);
pub const HANDLER_FRAME: Self = Self(4); pub const HANDLER_FRAME: Self = Self(4);
@ -36,16 +38,23 @@ impl UnwindAction {
pub const END_OF_STACK: Self = Self(16); pub const END_OF_STACK: Self = Self(16);
} }
pub type UnwindExceptionCleanupFn = extern "C" fn(UnwindReasonCode, *mut UnwindException); impl ops::BitOr for UnwindAction {
type Output = Self;
fn bitor(self, rhs: Self) -> Self {
Self(self.0 | rhs.0)
}
}
pub type UnwindStopFn = extern "C" fn( pub type UnwindExceptionCleanupFn = unsafe extern "C" fn(UnwindReasonCode, *mut UnwindException);
pub type UnwindStopFn = unsafe extern "C" fn(
c_int, c_int,
UnwindAction, UnwindAction,
u64, u64,
*mut UnwindException, *mut UnwindException,
*mut UnwindContext<'_>, *mut UnwindContext<'_>,
*mut c_void, *mut c_void,
); ) -> UnwindReasonCode;
#[repr(C)] #[repr(C)]
pub struct UnwindException { pub struct UnwindException {
@ -54,10 +63,10 @@ pub struct UnwindException {
} }
pub type UnwindTraceFn = pub type UnwindTraceFn =
extern "C" fn(ctx: &mut UnwindContext<'_>, arg: *mut c_void) -> UnwindReasonCode; unsafe extern "C" fn(ctx: &mut UnwindContext<'_>, arg: *mut c_void) -> UnwindReasonCode;
pub struct UnwindContext<'a> { pub struct UnwindContext<'a> {
frame: &'a Frame, frame: Option<&'a Frame>,
ctx: &'a mut Context, ctx: &'a mut Context,
} }
@ -65,8 +74,8 @@ pub type PersonalityRoutine = extern "C" fn(
c_int, c_int,
UnwindAction, UnwindAction,
u64, u64,
*mut UnwindException, &mut UnwindException,
*mut UnwindContext<'_>, &mut UnwindContext<'_>,
) -> UnwindReasonCode; ) -> UnwindReasonCode;
#[no_mangle] #[no_mangle]
@ -107,28 +116,38 @@ pub extern "C" fn _Unwind_SetIP(unwind_ctx: &mut UnwindContext<'_>, value: usize
pub extern "C" fn _Unwind_GetLanguageSpecificData( pub extern "C" fn _Unwind_GetLanguageSpecificData(
unwind_ctx: &mut UnwindContext<'_>, unwind_ctx: &mut UnwindContext<'_>,
) -> *mut c_void { ) -> *mut c_void {
unwind_ctx.frame.lsda() as *mut c_void unwind_ctx
.frame
.map(|f| f.lsda() as *mut c_void)
.unwrap_or(ptr::null_mut())
} }
#[no_mangle] #[no_mangle]
pub extern "C" fn _Unwind_GetRegionStart(unwind_ctx: &mut UnwindContext<'_>) -> usize { pub extern "C" fn _Unwind_GetRegionStart(unwind_ctx: &mut UnwindContext<'_>) -> usize {
unwind_ctx.frame.initial_address() unwind_ctx.frame.map(|f| f.initial_address()).unwrap_or(0)
} }
#[no_mangle] #[no_mangle]
pub extern "C" fn _Unwind_GetTextRelBase(unwind_ctx: &mut UnwindContext<'_>) -> usize { pub extern "C" fn _Unwind_GetTextRelBase(unwind_ctx: &mut UnwindContext<'_>) -> usize {
unwind_ctx.frame.bases().eh_frame.text.unwrap() as _ unwind_ctx
.frame
.map(|f| f.bases().eh_frame.text.unwrap() as _)
.unwrap_or(0)
} }
#[no_mangle] #[no_mangle]
pub extern "C" fn _Unwind_GetDataRelBase(unwind_ctx: &mut UnwindContext<'_>) -> usize { pub extern "C" fn _Unwind_GetDataRelBase(unwind_ctx: &mut UnwindContext<'_>) -> usize {
unwind_ctx.frame.bases().eh_frame.data.unwrap() as _ unwind_ctx
.frame
.map(|f| f.bases().eh_frame.data.unwrap() as _)
.unwrap_or(0)
} }
#[no_mangle] #[no_mangle]
pub extern "C" fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void { pub extern "C" fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void {
match find_fde::get_finder().find_fde(pc as usize - 1) { find_fde::get_finder()
Some(v) => v.fde.initial_address() as usize as _, .find_fde(pc as usize - 1)
None => ptr::null_mut(), .map(|r| r.fde.initial_address() as usize as _)
.unwrap_or(ptr::null_mut())
} }
} }