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Diffstat (limited to 'library/unwind/src/libunwind.rs')
| -rw-r--r-- | library/unwind/src/libunwind.rs | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/library/unwind/src/libunwind.rs b/library/unwind/src/libunwind.rs new file mode 100644 index 000000000..a5b6193b0 --- /dev/null +++ b/library/unwind/src/libunwind.rs @@ -0,0 +1,296 @@ +#![allow(nonstandard_style)] + +use libc::{c_int, c_void, uintptr_t}; + +#[repr(C)] +#[derive(Debug, Copy, Clone, PartialEq)] +pub enum _Unwind_Reason_Code { + _URC_NO_REASON = 0, + _URC_FOREIGN_EXCEPTION_CAUGHT = 1, + _URC_FATAL_PHASE2_ERROR = 2, + _URC_FATAL_PHASE1_ERROR = 3, + _URC_NORMAL_STOP = 4, + _URC_END_OF_STACK = 5, + _URC_HANDLER_FOUND = 6, + _URC_INSTALL_CONTEXT = 7, + _URC_CONTINUE_UNWIND = 8, + _URC_FAILURE = 9, // used only by ARM EHABI +} +pub use _Unwind_Reason_Code::*; + +pub type _Unwind_Exception_Class = u64; +pub type _Unwind_Word = uintptr_t; +pub type _Unwind_Ptr = uintptr_t; +pub type _Unwind_Trace_Fn = + extern "C" fn(ctx: *mut _Unwind_Context, arg: *mut c_void) -> _Unwind_Reason_Code; + +#[cfg(target_arch = "x86")] +pub const unwinder_private_data_size: usize = 5; + +#[cfg(target_arch = "x86_64")] +pub const unwinder_private_data_size: usize = 6; + +#[cfg(all(target_arch = "arm", not(any(target_os = "ios", target_os = "watchos"))))] +pub const unwinder_private_data_size: usize = 20; + +#[cfg(all(target_arch = "arm", any(target_os = "ios", target_os = "watchos")))] +pub const unwinder_private_data_size: usize = 5; + +#[cfg(all(target_arch = "aarch64", target_pointer_width = "64"))] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(all(target_arch = "aarch64", target_pointer_width = "32"))] +pub const unwinder_private_data_size: usize = 5; + +#[cfg(target_arch = "m68k")] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(target_arch = "mips")] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(target_arch = "mips64")] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(target_arch = "s390x")] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(any(target_arch = "sparc", target_arch = "sparc64"))] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))] +pub const unwinder_private_data_size: usize = 2; + +#[cfg(target_os = "emscripten")] +pub const unwinder_private_data_size: usize = 20; + +#[cfg(all(target_arch = "hexagon", target_os = "linux"))] +pub const unwinder_private_data_size: usize = 35; + +#[repr(C)] +pub struct _Unwind_Exception { + pub exception_class: _Unwind_Exception_Class, + pub exception_cleanup: _Unwind_Exception_Cleanup_Fn, + pub private: [_Unwind_Word; unwinder_private_data_size], +} + +pub enum _Unwind_Context {} + +pub type _Unwind_Exception_Cleanup_Fn = + extern "C" fn(unwind_code: _Unwind_Reason_Code, exception: *mut _Unwind_Exception); + +// FIXME: The `#[link]` attributes on `extern "C"` block marks those symbols declared in +// the block are reexported in dylib build of libstd. 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") +)] +extern "C-unwind" { + pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !; +} +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_if::cfg_if! { +if #[cfg(any(target_os = "ios", target_os = "watchos", target_os = "netbsd", not(target_arch = "arm")))] { + // Not ARM EHABI + #[repr(C)] + #[derive(Copy, Clone, PartialEq)] + pub enum _Unwind_Action { + _UA_SEARCH_PHASE = 1, + _UA_CLEANUP_PHASE = 2, + _UA_HANDLER_FRAME = 4, + _UA_FORCE_UNWIND = 8, + _UA_END_OF_STACK = 16, + } + pub use _Unwind_Action::*; + + #[cfg_attr( + all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), + link(name = "unwind", kind = "static", modifiers = "-bundle") + )] + 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_GetIP(ctx: *mut _Unwind_Context) -> _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; + pub fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void; + } + +} else { + // 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") + )] + 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 = 0; + _Unwind_VRS_Get(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32, + &mut val as *mut _ 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; + _Unwind_VRS_Set(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32, + &mut value as *mut _ as *mut c_void); + } + + pub unsafe fn _Unwind_GetIP(ctx: *mut _Unwind_Context) + -> _Unwind_Word { + let val = _Unwind_GetGR(ctx, UNWIND_IP_REG); + (val & !1) as _Unwind_Word + } + + pub unsafe fn _Unwind_SetIP(ctx: *mut _Unwind_Context, + value: _Unwind_Word) { + // Propagate thumb bit to instruction pointer + let thumb_state = _Unwind_GetGR(ctx, UNWIND_IP_REG) & 1; + let value = value | thumb_state; + _Unwind_SetGR(ctx, UNWIND_IP_REG, value); + } + + pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context, + ip_before_insn: *mut c_int) + -> _Unwind_Word { + *ip_before_insn = 0; + _Unwind_GetIP(ctx) + } + + // This function also doesn't exist on Android or ARM/Linux, so make it a no-op + pub unsafe fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void { + pc + } +} +} // cfg_if! + +cfg_if::cfg_if! { +if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] { + // Not 32-bit iOS + #[cfg_attr( + all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), + link(name = "unwind", kind = "static", modifiers = "-bundle") + )] + extern "C-unwind" { + pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code; + } + #[cfg_attr( + all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), + link(name = "unwind", kind = "static", modifiers = "-bundle") + )] + extern "C" { + pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn, + trace_argument: *mut c_void) + -> _Unwind_Reason_Code; + } +} else { + // 32-bit iOS uses SjLj and does not provide _Unwind_Backtrace() + extern "C-unwind" { + pub fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception) -> _Unwind_Reason_Code; + } + + pub use _Unwind_SjLj_RaiseException as _Unwind_RaiseException; +} +} // cfg_if! + +cfg_if::cfg_if! { +if #[cfg(all(windows, target_arch = "x86_64", target_env = "gnu"))] { + // 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; + + extern "C" { + pub fn _GCC_specific_handler(exceptionRecord: *mut EXCEPTION_RECORD, + establisherFrame: LPVOID, + contextRecord: *mut CONTEXT, + dispatcherContext: *mut DISPATCHER_CONTEXT, + personality: PersonalityFn) + -> EXCEPTION_DISPOSITION; + } +} +} // cfg_if! |