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Diffstat (limited to 'lib/gcc_personality_v0.c')
-rw-r--r--lib/gcc_personality_v0.c247
1 files changed, 0 insertions, 247 deletions
diff --git a/lib/gcc_personality_v0.c b/lib/gcc_personality_v0.c
deleted file mode 100644
index 8a708cae59748..0000000000000
--- a/lib/gcc_personality_v0.c
+++ /dev/null
@@ -1,247 +0,0 @@
-/* ===-- gcc_personality_v0.c - Implement __gcc_personality_v0 -------------===
- *
- * The LLVM Compiler Infrastructure
- *
- * This file is dual licensed under the MIT and the University of Illinois Open
- * Source Licenses. See LICENSE.TXT for details.
- *
- * ===----------------------------------------------------------------------===
- *
- */
-
-#include "int_lib.h"
-
-/*
- * _Unwind_* stuff based on C++ ABI public documentation
- * http://refspecs.freestandards.org/abi-eh-1.21.html
- */
-
-typedef enum {
- _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
-} _Unwind_Reason_Code;
-
-typedef enum {
- _UA_SEARCH_PHASE = 1,
- _UA_CLEANUP_PHASE = 2,
- _UA_HANDLER_FRAME = 4,
- _UA_FORCE_UNWIND = 8,
- _UA_END_OF_STACK = 16
-} _Unwind_Action;
-
-typedef struct _Unwind_Context* _Unwind_Context_t;
-
-struct _Unwind_Exception {
- uint64_t exception_class;
- void (*exception_cleanup)(_Unwind_Reason_Code reason,
- struct _Unwind_Exception* exc);
- uintptr_t private_1;
- uintptr_t private_2;
-};
-
-extern const uint8_t* _Unwind_GetLanguageSpecificData(_Unwind_Context_t c);
-extern void _Unwind_SetGR(_Unwind_Context_t c, int i, uintptr_t n);
-extern void _Unwind_SetIP(_Unwind_Context_t, uintptr_t new_value);
-extern uintptr_t _Unwind_GetIP(_Unwind_Context_t context);
-extern uintptr_t _Unwind_GetRegionStart(_Unwind_Context_t context);
-
-
-/*
- * Pointer encodings documented at:
- * http://refspecs.freestandards.org/LSB_1.3.0/gLSB/gLSB/ehframehdr.html
- */
-
-#define DW_EH_PE_omit 0xff /* no data follows */
-
-#define DW_EH_PE_absptr 0x00
-#define DW_EH_PE_uleb128 0x01
-#define DW_EH_PE_udata2 0x02
-#define DW_EH_PE_udata4 0x03
-#define DW_EH_PE_udata8 0x04
-#define DW_EH_PE_sleb128 0x09
-#define DW_EH_PE_sdata2 0x0A
-#define DW_EH_PE_sdata4 0x0B
-#define DW_EH_PE_sdata8 0x0C
-
-#define DW_EH_PE_pcrel 0x10
-#define DW_EH_PE_textrel 0x20
-#define DW_EH_PE_datarel 0x30
-#define DW_EH_PE_funcrel 0x40
-#define DW_EH_PE_aligned 0x50
-#define DW_EH_PE_indirect 0x80 /* gcc extension */
-
-
-
-/* read a uleb128 encoded value and advance pointer */
-static uintptr_t readULEB128(const uint8_t** data)
-{
- uintptr_t result = 0;
- uintptr_t shift = 0;
- unsigned char byte;
- const uint8_t* p = *data;
- do {
- byte = *p++;
- result |= (byte & 0x7f) << shift;
- shift += 7;
- } while (byte & 0x80);
- *data = p;
- return result;
-}
-
-/* read a pointer encoded value and advance pointer */
-static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding)
-{
- const uint8_t* p = *data;
- uintptr_t result = 0;
-
- if ( encoding == DW_EH_PE_omit )
- return 0;
-
- /* first get value */
- switch (encoding & 0x0F) {
- case DW_EH_PE_absptr:
- result = *((uintptr_t*)p);
- p += sizeof(uintptr_t);
- break;
- case DW_EH_PE_uleb128:
- result = readULEB128(&p);
- break;
- case DW_EH_PE_udata2:
- result = *((uint16_t*)p);
- p += sizeof(uint16_t);
- break;
- case DW_EH_PE_udata4:
- result = *((uint32_t*)p);
- p += sizeof(uint32_t);
- break;
- case DW_EH_PE_udata8:
- result = *((uint64_t*)p);
- p += sizeof(uint64_t);
- break;
- case DW_EH_PE_sdata2:
- result = *((int16_t*)p);
- p += sizeof(int16_t);
- break;
- case DW_EH_PE_sdata4:
- result = *((int32_t*)p);
- p += sizeof(int32_t);
- break;
- case DW_EH_PE_sdata8:
- result = *((int64_t*)p);
- p += sizeof(int64_t);
- break;
- case DW_EH_PE_sleb128:
- default:
- /* not supported */
- compilerrt_abort();
- break;
- }
-
- /* then add relative offset */
- switch ( encoding & 0x70 ) {
- case DW_EH_PE_absptr:
- /* do nothing */
- break;
- case DW_EH_PE_pcrel:
- result += (uintptr_t)(*data);
- break;
- case DW_EH_PE_textrel:
- case DW_EH_PE_datarel:
- case DW_EH_PE_funcrel:
- case DW_EH_PE_aligned:
- default:
- /* not supported */
- compilerrt_abort();
- break;
- }
-
- /* then apply indirection */
- if (encoding & DW_EH_PE_indirect) {
- result = *((uintptr_t*)result);
- }
-
- *data = p;
- return result;
-}
-
-
-/*
- * The C compiler makes references to __gcc_personality_v0 in
- * the dwarf unwind information for translation units that use
- * __attribute__((cleanup(xx))) on local variables.
- * This personality routine is called by the system unwinder
- * on each frame as the stack is unwound during a C++ exception
- * throw through a C function compiled with -fexceptions.
- */
-#if __arm__
-// the setjump-longjump based exceptions personality routine has a different name
-_Unwind_Reason_Code __gcc_personality_sj0(int version, _Unwind_Action actions,
- uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
- _Unwind_Context_t context)
-#else
-_Unwind_Reason_Code __gcc_personality_v0(int version, _Unwind_Action actions,
- uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
- _Unwind_Context_t context)
-#endif
-{
- /* Since C does not have catch clauses, there is nothing to do during */
- /* phase 1 (the search phase). */
- if ( actions & _UA_SEARCH_PHASE )
- return _URC_CONTINUE_UNWIND;
-
- /* There is nothing to do if there is no LSDA for this frame. */
- const uint8_t* lsda = _Unwind_GetLanguageSpecificData(context);
- if ( lsda == (uint8_t*) 0 )
- return _URC_CONTINUE_UNWIND;
-
- uintptr_t pc = _Unwind_GetIP(context)-1;
- uintptr_t funcStart = _Unwind_GetRegionStart(context);
- uintptr_t pcOffset = pc - funcStart;
-
- /* Parse LSDA header. */
- uint8_t lpStartEncoding = *lsda++;
- if (lpStartEncoding != DW_EH_PE_omit) {
- readEncodedPointer(&lsda, lpStartEncoding);
- }
- uint8_t ttypeEncoding = *lsda++;
- if (ttypeEncoding != DW_EH_PE_omit) {
- readULEB128(&lsda);
- }
- /* Walk call-site table looking for range that includes current PC. */
- uint8_t callSiteEncoding = *lsda++;
- uint32_t callSiteTableLength = readULEB128(&lsda);
- const uint8_t* callSiteTableStart = lsda;
- const uint8_t* callSiteTableEnd = callSiteTableStart + callSiteTableLength;
- const uint8_t* p=callSiteTableStart;
- while (p < callSiteTableEnd) {
- uintptr_t start = readEncodedPointer(&p, callSiteEncoding);
- uintptr_t length = readEncodedPointer(&p, callSiteEncoding);
- uintptr_t landingPad = readEncodedPointer(&p, callSiteEncoding);
- readULEB128(&p); /* action value not used for C code */
- if ( landingPad == 0 )
- continue; /* no landing pad for this entry */
- if ( (start <= pcOffset) && (pcOffset < (start+length)) ) {
- /* Found landing pad for the PC.
- * Set Instruction Pointer to so we re-enter function
- * at landing pad. The landing pad is created by the compiler
- * to take two parameters in registers.
- */
- _Unwind_SetGR(context, __builtin_eh_return_data_regno(0),
- (uintptr_t)exceptionObject);
- _Unwind_SetGR(context, __builtin_eh_return_data_regno(1), 0);
- _Unwind_SetIP(context, funcStart+landingPad);
- return _URC_INSTALL_CONTEXT;
- }
- }
-
- /* No landing pad found, continue unwinding. */
- return _URC_CONTINUE_UNWIND;
-}
-
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