| #![allow(nonstandard_style)] | |
| use core::ffi::{c_int, c_void}; | |
| // Use the unwinding crate as unwinder on Xous | |
| #[cfg(target_os = "xous")] | |
| pub use unwinding::custom_eh_frame_finder::{ | |
| EhFrameFinder, FrameInfo, FrameInfoKind, set_custom_eh_frame_finder, | |
| }; | |
| pub use crate::types::*; | |
| pub type _Unwind_Ptr = *const u8; | |
| pub enum _Unwind_Context {} | |
| // FIXME: The `#[link]` attributes on `extern "C"` block marks those symbols declared in | |
| // the block are reexported in dylib build of std. This is needed when build rustc with | |
| // feature `llvm-libunwind`, as no other cdylib will provided those _Unwind_* symbols. | |
| // However the `link` attribute is duplicated multiple times and does not just export symbol, | |
| // a better way to manually export symbol would be another attribute like `#[export]`. | |
| // See the logic in function rustc_codegen_ssa::src::back::exported_symbols, module | |
| // rustc_codegen_ssa::src::back::symbol_export, rustc_middle::middle::exported_symbols | |
| // and RFC 2841 | |
| #[cfg_attr( | |
| all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), | |
| link(name = "unwind", kind = "static", modifiers = "-bundle") | |
| )] | |
| // Explicitly link the `unwind` library on WASI targets. | |
| // | |
| // This is provided in the self-contained sysroot for WASI targets by default. | |
| // Note that Rust defaults to `-Cpanic=abort` on WASI targets meaning that this | |
| // doesn't end up getting used by default, but this does mean that with | |
| // `-Zbuild-std` this'll automatically link it in. | |
| #[cfg_attr(target_os = "wasi", link(name = "unwind"))] | |
| unsafe extern "C-unwind" { | |
| pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !; | |
| } | |
| unsafe extern "C" { | |
| pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception); | |
| pub fn _Unwind_GetLanguageSpecificData(ctx: *mut _Unwind_Context) -> *mut c_void; | |
| pub fn _Unwind_GetRegionStart(ctx: *mut _Unwind_Context) -> _Unwind_Ptr; | |
| pub fn _Unwind_GetTextRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr; | |
| pub fn _Unwind_GetDataRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr; | |
| } | |
| cfg_select! { | |
| any(target_vendor = "apple", target_os = "netbsd", not(target_arch = "arm")) => { | |
| // Not ARM EHABI | |
| // | |
| // 32-bit ARM on iOS/tvOS/watchOS use either DWARF/Compact unwinding or | |
| // "setjmp-longjmp" / SjLj unwinding. | |
| pub type _Unwind_Action = c_int; | |
| pub const _UA_SEARCH_PHASE: c_int = 1; | |
| //pub const _UA_CLEANUP_PHASE: c_int = 2; | |
| //pub const _UA_HANDLER_FRAME: c_int = 4; | |
| pub const _UA_FORCE_UNWIND: c_int = 8; | |
| //pub const _UA_END_OF_STACK: c_int = 16; | |
| #[cfg_attr( | |
| all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), | |
| link(name = "unwind", kind = "static", modifiers = "-bundle") | |
| )] | |
| unsafe extern "C" { | |
| pub fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word; | |
| pub fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word); | |
| pub fn _Unwind_SetIP(ctx: *mut _Unwind_Context, value: _Unwind_Word); | |
| pub fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context, ip_before_insn: *mut c_int) | |
| -> _Unwind_Word; | |
| } | |
| } | |
| _ => { | |
| // ARM EHABI | |
| #[repr(C)] | |
| #[derive(Copy, Clone, PartialEq)] | |
| pub enum _Unwind_State { | |
| _US_VIRTUAL_UNWIND_FRAME = 0, | |
| _US_UNWIND_FRAME_STARTING = 1, | |
| _US_UNWIND_FRAME_RESUME = 2, | |
| _US_ACTION_MASK = 3, | |
| _US_FORCE_UNWIND = 8, | |
| _US_END_OF_STACK = 16, | |
| } | |
| pub use _Unwind_State::*; | |
| #[repr(C)] | |
| enum _Unwind_VRS_Result { | |
| _UVRSR_OK = 0, | |
| _UVRSR_NOT_IMPLEMENTED = 1, | |
| _UVRSR_FAILED = 2, | |
| } | |
| #[repr(C)] | |
| enum _Unwind_VRS_RegClass { | |
| _UVRSC_CORE = 0, | |
| _UVRSC_VFP = 1, | |
| _UVRSC_FPA = 2, | |
| _UVRSC_WMMXD = 3, | |
| _UVRSC_WMMXC = 4, | |
| } | |
| use _Unwind_VRS_RegClass::*; | |
| #[repr(C)] | |
| enum _Unwind_VRS_DataRepresentation { | |
| _UVRSD_UINT32 = 0, | |
| _UVRSD_VFPX = 1, | |
| _UVRSD_FPAX = 2, | |
| _UVRSD_UINT64 = 3, | |
| _UVRSD_FLOAT = 4, | |
| _UVRSD_DOUBLE = 5, | |
| } | |
| use _Unwind_VRS_DataRepresentation::*; | |
| pub const UNWIND_POINTER_REG: c_int = 12; | |
| pub const UNWIND_SP_REG: c_int = 13; | |
| pub const UNWIND_IP_REG: c_int = 15; | |
| #[cfg_attr( | |
| all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), | |
| link(name = "unwind", kind = "static", modifiers = "-bundle") | |
| )] | |
| unsafe extern "C" { | |
| fn _Unwind_VRS_Get(ctx: *mut _Unwind_Context, | |
| regclass: _Unwind_VRS_RegClass, | |
| regno: _Unwind_Word, | |
| repr: _Unwind_VRS_DataRepresentation, | |
| data: *mut c_void) | |
| -> _Unwind_VRS_Result; | |
| fn _Unwind_VRS_Set(ctx: *mut _Unwind_Context, | |
| regclass: _Unwind_VRS_RegClass, | |
| regno: _Unwind_Word, | |
| repr: _Unwind_VRS_DataRepresentation, | |
| data: *mut c_void) | |
| -> _Unwind_VRS_Result; | |
| } | |
| // On Android or ARM/Linux, these are implemented as macros: | |
| pub unsafe fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word { | |
| let mut val: _Unwind_Word = core::ptr::null(); | |
| unsafe { _Unwind_VRS_Get(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32, | |
| (&raw mut val) as *mut c_void); } | |
| val | |
| } | |
| pub unsafe fn _Unwind_SetGR( | |
| ctx: *mut _Unwind_Context, | |
| reg_index: c_int, | |
| value: _Unwind_Word | |
| ) { | |
| let mut value = value; | |
| unsafe { _Unwind_VRS_Set(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32, | |
| (&raw mut value) as *mut c_void); } | |
| } | |
| pub unsafe fn _Unwind_SetIP(ctx: *mut _Unwind_Context, | |
| value: _Unwind_Word) { | |
| // Propagate thumb bit to instruction pointer | |
| let thumb_state = unsafe { _Unwind_GetGR(ctx, UNWIND_IP_REG).addr() & 1 }; | |
| let value = value.map_addr(|v| v | thumb_state); | |
| unsafe { _Unwind_SetGR(ctx, UNWIND_IP_REG, value); } | |
| } | |
| pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context, | |
| ip_before_insn: *mut c_int) | |
| -> _Unwind_Word { | |
| unsafe { *ip_before_insn = 0 }; | |
| let val = unsafe { _Unwind_GetGR(ctx, UNWIND_IP_REG) }; | |
| val.map_addr(|v| v & !1) | |
| } | |
| } | |
| } | |
| #[cfg_attr( | |
| all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), | |
| link(name = "unwind", kind = "static", modifiers = "-bundle") | |
| )] | |
| unsafe extern "C-unwind" { | |
| // 32-bit ARM Apple (except for watchOS armv7k specifically) uses SjLj | |
| #[cfg_attr( | |
| all(target_vendor = "apple", not(target_os = "watchos"), target_arch = "arm"), | |
| link_name = "_Unwind_SjLj_RaiseException" | |
| )] | |
| pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code; | |
| } | |
| cfg_select! { | |
| any( | |
| all(windows, any(target_arch = "aarch64", target_arch = "x86_64"), target_env = "gnu"), | |
| target_os = "cygwin", | |
| ) => { | |
| // We declare these as opaque types. This is fine since you just need to | |
| // pass them to _GCC_specific_handler and forget about them. | |
| pub enum EXCEPTION_RECORD {} | |
| pub type LPVOID = *mut c_void; | |
| pub enum CONTEXT {} | |
| pub enum DISPATCHER_CONTEXT {} | |
| pub type EXCEPTION_DISPOSITION = c_int; | |
| type PersonalityFn = unsafe extern "C" fn(version: c_int, | |
| actions: _Unwind_Action, | |
| exception_class: _Unwind_Exception_Class, | |
| exception_object: *mut _Unwind_Exception, | |
| context: *mut _Unwind_Context) | |
| -> _Unwind_Reason_Code; | |
| unsafe extern "C" { | |
| pub fn _GCC_specific_handler(exceptionRecord: *mut EXCEPTION_RECORD, | |
| establisherFrame: LPVOID, | |
| contextRecord: *mut CONTEXT, | |
| dispatcherContext: *mut DISPATCHER_CONTEXT, | |
| personality: PersonalityFn) | |
| -> EXCEPTION_DISPOSITION; | |
| } | |
| } | |
| _ => {} | |
| } |