src/libunwind/libunwind.rs

   1 #![allow(nonstandard_style)]
   2
   3 use libc::{c_int, c_void, uintptr_t};
   4
   5 #[repr(C)]
   6 #[derive(Debug, Copy, Clone, PartialEq)]
   7 pub enum _Unwind_Reason_Code {
   8     _URC_NO_REASON = 0,
   9     _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
  10     _URC_FATAL_PHASE2_ERROR = 2,
  11     _URC_FATAL_PHASE1_ERROR = 3,
  12     _URC_NORMAL_STOP = 4,
  13     _URC_END_OF_STACK = 5,
  14     _URC_HANDLER_FOUND = 6,
  15     _URC_INSTALL_CONTEXT = 7,
  16     _URC_CONTINUE_UNWIND = 8,
  17     _URC_FAILURE = 9, // used only by ARM EHABI
  18 }
  19 pub use _Unwind_Reason_Code::*;
  20
  21 pub type _Unwind_Exception_Class = u64;
  22 pub type _Unwind_Word = uintptr_t;
  23 pub type _Unwind_Ptr = uintptr_t;
  24 pub type _Unwind_Trace_Fn = extern "C" fn(ctx: *mut _Unwind_Context, arg: *mut c_void)
  25                                           -> _Unwind_Reason_Code;
  26 #[cfg(target_arch = "x86")]
  27 pub const unwinder_private_data_size: usize = 5;
  28
  29 #[cfg(target_arch = "x86_64")]
  30 pub const unwinder_private_data_size: usize = 6;
  31
  32 #[cfg(all(target_arch = "arm", not(target_os = "ios")))]
  33 pub const unwinder_private_data_size: usize = 20;
  34
  35 #[cfg(all(target_arch = "arm", target_os = "ios"))]
  36 pub const unwinder_private_data_size: usize = 5;
  37
  38 #[cfg(target_arch = "aarch64")]
  39 pub const unwinder_private_data_size: usize = 2;
  40
  41 #[cfg(target_arch = "mips")]
  42 pub const unwinder_private_data_size: usize = 2;
  43
  44 #[cfg(target_arch = "mips64")]
  45 pub const unwinder_private_data_size: usize = 2;
  46
  47 #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
  48 pub const unwinder_private_data_size: usize = 2;
  49
  50 #[cfg(target_arch = "s390x")]
  51 pub const unwinder_private_data_size: usize = 2;
  52
  53 #[cfg(target_arch = "sparc64")]
  54 pub const unwinder_private_data_size: usize = 2;
  55
  56 #[cfg(target_os = "emscripten")]
  57 pub const unwinder_private_data_size: usize = 20;
  58
  59 #[cfg(all(target_arch = "hexagon", target_os = "linux"))]
  60 pub const unwinder_private_data_size: usize = 35;
  61
  62 #[repr(C)]
  63 pub struct _Unwind_Exception {
  64     pub exception_class: _Unwind_Exception_Class,
  65     pub exception_cleanup: _Unwind_Exception_Cleanup_Fn,
  66     pub private: [_Unwind_Word; unwinder_private_data_size],
  67 }
  68
  69 pub enum _Unwind_Context {}
  70
  71 pub type _Unwind_Exception_Cleanup_Fn = extern "C" fn(unwind_code: _Unwind_Reason_Code,
  72                                                       exception: *mut _Unwind_Exception);
  73 #[cfg_attr(all(feature = "llvm-libunwind",
  74                any(target_os = "fuchsia", target_os = "linux")),
  75            link(name = "unwind", kind = "static"))]
  76 extern "C" {
  77     #[unwind(allowed)]
  78     pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !;
  79     pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception);
  80     pub fn _Unwind_GetLanguageSpecificData(ctx: *mut _Unwind_Context) -> *mut c_void;
  81     pub fn _Unwind_GetRegionStart(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
  82     pub fn _Unwind_GetTextRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
  83     pub fn _Unwind_GetDataRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
  84 }
  85
  86 cfg_if::cfg_if! {
  87 if #[cfg(all(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm"))))] {
  88     // Not ARM EHABI
  89     #[repr(C)]
  90     #[derive(Copy, Clone, PartialEq)]
  91     pub enum _Unwind_Action {
  92         _UA_SEARCH_PHASE = 1,
  93         _UA_CLEANUP_PHASE = 2,
  94         _UA_HANDLER_FRAME = 4,
  95         _UA_FORCE_UNWIND = 8,
  96         _UA_END_OF_STACK = 16,
  97     }
  98     pub use _Unwind_Action::*;
  99
 100     #[cfg_attr(all(feature = "llvm-libunwind",
 101                    any(target_os = "fuchsia", target_os = "linux")),
 102                link(name = "unwind", kind = "static"))]
 103     extern "C" {
 104         pub fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word;
 105         pub fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word);
 106         pub fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> _Unwind_Word;
 107         pub fn _Unwind_SetIP(ctx: *mut _Unwind_Context, value: _Unwind_Word);
 108         pub fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context, ip_before_insn: *mut c_int)
 109                                  -> _Unwind_Word;
 110         pub fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void;
 111     }
 112
 113 } else {
 114     // ARM EHABI
 115     #[repr(C)]
 116     #[derive(Copy, Clone, PartialEq)]
 117     pub enum _Unwind_State {
 118         _US_VIRTUAL_UNWIND_FRAME = 0,
 119         _US_UNWIND_FRAME_STARTING = 1,
 120         _US_UNWIND_FRAME_RESUME = 2,
 121         _US_ACTION_MASK = 3,
 122         _US_FORCE_UNWIND = 8,
 123         _US_END_OF_STACK = 16,
 124     }
 125     pub use _Unwind_State::*;
 126
 127     #[repr(C)]
 128     enum _Unwind_VRS_Result {
 129         _UVRSR_OK = 0,
 130         _UVRSR_NOT_IMPLEMENTED = 1,
 131         _UVRSR_FAILED = 2,
 132     }
 133     #[repr(C)]
 134     enum _Unwind_VRS_RegClass {
 135         _UVRSC_CORE = 0,
 136         _UVRSC_VFP = 1,
 137         _UVRSC_FPA = 2,
 138         _UVRSC_WMMXD = 3,
 139         _UVRSC_WMMXC = 4,
 140     }
 141     use _Unwind_VRS_RegClass::*;
 142     #[repr(C)]
 143     enum _Unwind_VRS_DataRepresentation {
 144         _UVRSD_UINT32 = 0,
 145         _UVRSD_VFPX = 1,
 146         _UVRSD_FPAX = 2,
 147         _UVRSD_UINT64 = 3,
 148         _UVRSD_FLOAT = 4,
 149         _UVRSD_DOUBLE = 5,
 150     }
 151     use _Unwind_VRS_DataRepresentation::*;
 152
 153     pub const UNWIND_POINTER_REG: c_int = 12;
 154     pub const UNWIND_IP_REG: c_int = 15;
 155
 156     #[cfg_attr(all(feature = "llvm-libunwind",
 157                    any(target_os = "fuchsia", target_os = "linux")),
 158                link(name = "unwind", kind = "static"))]
 159     extern "C" {
 160         fn _Unwind_VRS_Get(ctx: *mut _Unwind_Context,
 161                            regclass: _Unwind_VRS_RegClass,
 162                            regno: _Unwind_Word,
 163                            repr: _Unwind_VRS_DataRepresentation,
 164                            data: *mut c_void)
 165                            -> _Unwind_VRS_Result;
 166
 167         fn _Unwind_VRS_Set(ctx: *mut _Unwind_Context,
 168                            regclass: _Unwind_VRS_RegClass,
 169                            regno: _Unwind_Word,
 170                            repr: _Unwind_VRS_DataRepresentation,
 171                            data: *mut c_void)
 172                            -> _Unwind_VRS_Result;
 173     }
 174
 175     // On Android or ARM/Linux, these are implemented as macros:
 176
 177     pub unsafe fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word {
 178         let mut val: _Unwind_Word = 0;
 179         _Unwind_VRS_Get(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
 180                         &mut val as *mut _ as *mut c_void);
 181         val
 182     }
 183
 184     pub unsafe fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word) {
 185         let mut value = value;
 186         _Unwind_VRS_Set(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
 187                         &mut value as *mut _ as *mut c_void);
 188     }
 189
 190     pub unsafe fn _Unwind_GetIP(ctx: *mut _Unwind_Context)
 191                                 -> _Unwind_Word {
 192         let val = _Unwind_GetGR(ctx, UNWIND_IP_REG);
 193         (val & !1) as _Unwind_Word
 194     }
 195
 196     pub unsafe fn _Unwind_SetIP(ctx: *mut _Unwind_Context,
 197                                 value: _Unwind_Word) {
 198         // Propagate thumb bit to instruction pointer
 199         let thumb_state = _Unwind_GetGR(ctx, UNWIND_IP_REG) & 1;
 200         let value = value | thumb_state;
 201         _Unwind_SetGR(ctx, UNWIND_IP_REG, value);
 202     }
 203
 204     pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context,
 205                                     ip_before_insn: *mut c_int)
 206                                     -> _Unwind_Word {
 207         *ip_before_insn = 0;
 208         _Unwind_GetIP(ctx)
 209     }
 210
 211     // This function also doesn't exist on Android or ARM/Linux, so make it a no-op
 212     pub unsafe fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void {
 213         pc
 214     }
 215 }
 216 } // cfg_if!
 217
 218 cfg_if::cfg_if! {
 219 if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
 220     // Not 32-bit iOS
 221     #[cfg_attr(all(feature = "llvm-libunwind",
 222                    any(target_os = "fuchsia", target_os = "linux")),
 223                link(name = "unwind", kind = "static"))]
 224     extern "C" {
 225         #[unwind(allowed)]
 226         pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
 227         pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn,
 228                                  trace_argument: *mut c_void)
 229                                  -> _Unwind_Reason_Code;
 230     }
 231 } else {
 232     // 32-bit iOS uses SjLj and does not provide _Unwind_Backtrace()
 233     #[cfg_attr(all(feature = "llvm-libunwind",
 234                    any(target_os = "fuchsia", target_os = "linux")),
 235                link(name = "unwind", kind = "static"))]
 236     extern "C" {
 237         #[unwind(allowed)]
 238         pub fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
 239     }
 240
 241     #[inline]
 242     pub unsafe fn _Unwind_RaiseException(exc: *mut _Unwind_Exception) -> _Unwind_Reason_Code {
 243         _Unwind_SjLj_RaiseException(exc)
 244     }
 245 }
 246 } // cfg_if!
 247
 248 cfg_if::cfg_if! {
 249 if #[cfg(all(windows, target_arch = "x86_64", target_env = "gnu"))] {
 250     // We declare these as opaque types. This is fine since you just need to
 251     // pass them to _GCC_specific_handler and forget about them.
 252     pub enum EXCEPTION_RECORD {}
 253     pub type LPVOID = *mut c_void;
 254     pub enum CONTEXT {}
 255     pub enum DISPATCHER_CONTEXT {}
 256     pub type EXCEPTION_DISPOSITION = c_int;
 257     type PersonalityFn = unsafe extern "C" fn(version: c_int,
 258                                               actions: _Unwind_Action,
 259                                               exception_class: _Unwind_Exception_Class,
 260                                               exception_object: *mut _Unwind_Exception,
 261                                               context: *mut _Unwind_Context)
 262                                               -> _Unwind_Reason_Code;
 263
 264     extern "C" {
 265         pub fn _GCC_specific_handler(exceptionRecord: *mut EXCEPTION_RECORD,
 266                                 establisherFrame: LPVOID,
 267                                 contextRecord: *mut CONTEXT,
 268                                 dispatcherContext: *mut DISPATCHER_CONTEXT,
 269                                 personality: PersonalityFn)
 270                                 -> EXCEPTION_DISPOSITION;
 271     }
 272 }
 273 } // cfg_if!