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-rw-r--r--lib/libcompiler_rt/gcc_personality_v0.c251
1 files changed, 0 insertions, 251 deletions
diff --git a/lib/libcompiler_rt/gcc_personality_v0.c b/lib/libcompiler_rt/gcc_personality_v0.c
deleted file mode 100644
index 68581ef1643..00000000000
--- a/lib/libcompiler_rt/gcc_personality_v0.c
+++ /dev/null
@@ -1,251 +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"
-
-#include <unwind.h>
-#if defined(__arm__) && !defined(__ARM_DWARF_EH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
-/*
- * When building with older compilers (e.g. clang <3.9), it is possible that we
- * have a version of unwind.h which does not provide the EHABI declarations
- * which are quired for the C personality to conform to the specification. In
- * order to provide forward compatibility for such compilers, we re-declare the
- * necessary interfaces in the helper to permit a standalone compilation of the
- * builtins (which contains the C unwinding personality for historical reasons).
- */
-#include "unwind-ehabi-helpers.h"
-#endif
-
-/*
- * 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 = *((const uintptr_t*)p);
- p += sizeof(uintptr_t);
- break;
- case DW_EH_PE_uleb128:
- result = readULEB128(&p);
- break;
- case DW_EH_PE_udata2:
- result = *((const uint16_t*)p);
- p += sizeof(uint16_t);
- break;
- case DW_EH_PE_udata4:
- result = *((const uint32_t*)p);
- p += sizeof(uint32_t);
- break;
- case DW_EH_PE_udata8:
- result = *((const uint64_t*)p);
- p += sizeof(uint64_t);
- break;
- case DW_EH_PE_sdata2:
- result = *((const int16_t*)p);
- p += sizeof(int16_t);
- break;
- case DW_EH_PE_sdata4:
- result = *((const int32_t*)p);
- p += sizeof(int32_t);
- break;
- case DW_EH_PE_sdata8:
- result = *((const 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 = *((const uintptr_t*)result);
- }
-
- *data = p;
- return result;
-}
-
-#if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
- !defined(__ARM_DWARF_EH__)
-#define USING_ARM_EHABI 1
-_Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception *,
- struct _Unwind_Context *);
-#endif
-
-static inline _Unwind_Reason_Code
-continueUnwind(struct _Unwind_Exception *exceptionObject,
- struct _Unwind_Context *context) {
-#if USING_ARM_EHABI
- /*
- * On ARM EHABI the personality routine is responsible for actually
- * unwinding a single stack frame before returning (ARM EHABI Sec. 6.1).
- */
- if (__gnu_unwind_frame(exceptionObject, context) != _URC_OK)
- return _URC_FAILURE;
-#endif
- return _URC_CONTINUE_UNWIND;
-}
-
-/*
- * 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 __USING_SJLJ_EXCEPTIONS__
-/* the setjump-longjump based exceptions personality routine has a
- * different name */
-COMPILER_RT_ABI _Unwind_Reason_Code
-__gcc_personality_sj0(int version, _Unwind_Action actions,
- uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
- struct _Unwind_Context *context)
-#elif USING_ARM_EHABI
-/* The ARM EHABI personality routine has a different signature. */
-COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
- _Unwind_State state, struct _Unwind_Exception *exceptionObject,
- struct _Unwind_Context *context)
-#else
-COMPILER_RT_ABI _Unwind_Reason_Code
-__gcc_personality_v0(int version, _Unwind_Action actions,
- uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
- struct _Unwind_Context *context)
-#endif
-{
- /* Since C does not have catch clauses, there is nothing to do during */
- /* phase 1 (the search phase). */
-#if USING_ARM_EHABI
- /* After resuming from a cleanup we should also continue on to the next
- * frame straight away. */
- if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING)
-#else
- if ( actions & _UA_SEARCH_PHASE )
-#endif
- return continueUnwind(exceptionObject, context);
-
- /* There is nothing to do if there is no LSDA for this frame. */
- const uint8_t* lsda = (uint8_t*)_Unwind_GetLanguageSpecificData(context);
- if ( lsda == (uint8_t*) 0 )
- return continueUnwind(exceptionObject, context);
-
- uintptr_t pc = (uintptr_t)_Unwind_GetIP(context)-1;
- uintptr_t funcStart = (uintptr_t)_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 continueUnwind(exceptionObject, context);
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.