1 //===----------------------------------------------------------------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //  Implements ARM zero-cost C++ exceptions
10 //===----------------------------------------------------------------------===//
12 #include "Unwind-EHABI.h"
35   return byteData[(offset & ~(size_t)0x03) + (3 - (offset & (size_t)0x03))];  in getByte()
56     SU16 = 0, // Short descriptor, 16-bit entries
57     LU16 = 1, // Long descriptor,  16-bit entries
58     LU32 = 3, // Long descriptor,  32-bit entries
60     RESERVED4 =  8, RESERVED5 =  9, RESERVED6  = 10, RESERVED7  = 11,
110     // See # 9.2 table for decoding the kind of descriptor. It's a 2-bit value.  in ProcessDescriptors()
117     uintptr_t scopeStart = ucbp->pr_cache.fnstart + offset;  in ProcessDescriptors()
173   const uint32_t* unwindingData = ucbp->pr_cache.ehtp;  in unwindOneFrame()
185                          ucbp->pr_cache.additional);  in unwindOneFrame()
203   return ((1U << (count_minus_one + 1)) - 1) << start;  in RegisterMask()
271         sp -= (((uint32_t)byte & 0x3f) << 2) + 4;  in _Unwind_VRS_Interpret()
376                               RegisterRange(10, byte & 0x7), _UVRSD_DOUBLE);  in _Unwind_VRS_Interpret()
466   // EHABI #7.3 discusses preserving the VRS in a "temporary VRS" during  in unwind_phase1()
467   // phase 1 and then restoring it to the "primary VRS" for phase 2. The  in unwind_phase1()
468   // effect is phase 2 doesn't see any of the VRS manipulations from phase 1.  in unwind_phase1()
469   // In this implementation, the phases don't share the VRS backing store.  in unwind_phase1()
470   // Instead, they are passed the original |uc| and they create a new VRS  in unwind_phase1()
518       exception_object->pr_cache.fnstart = frameInfo.start_ip;  in unwind_phase1()
519       exception_object->pr_cache.ehtp =  in unwind_phase1()
521       exception_object->pr_cache.additional = frameInfo.flags;  in unwind_phase1()
528           exception_object->pr_cache.fnstart,  in unwind_phase1()
529           static_cast<void *>(exception_object->pr_cache.ehtp),  in unwind_phase1()
530           exception_object->pr_cache.additional);  in unwind_phase1()
568   // See comment at the start of unwind_phase1 regarding VRS integrity.  in unwind_phase2()
586       // phase2. To continue unwindingly correctly, replace VRS[15] with the  in unwind_phase2()
592                     exception_object->unwinder_cache.reserved2);  in unwind_phase2()
633       exception_object->pr_cache.fnstart = frameInfo.start_ip;  in unwind_phase2()
634       exception_object->pr_cache.ehtp =  in unwind_phase2()
636       exception_object->pr_cache.additional = frameInfo.flags;  in unwind_phase2()
646         if (sp == exception_object->barrier_cache.sp) {  in unwind_phase2()
662           _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): re-entering "  in unwind_phase2()
673           exception_object->unwinder_cache.reserved2 = (uint32_t)pc;  in unwind_phase2()
703   // See comment at the start of unwind_phase1 regarding VRS integrity.  in unwind_phase2_forced()
740         (*stop)(1, action, exception_object->exception_class, exception_object,  in unwind_phase2_forced()
758       exception_object->pr_cache.fnstart = frameInfo.start_ip;  in unwind_phase2_forced()
759       exception_object->pr_cache.ehtp =  in unwind_phase2_forced()
761       exception_object->pr_cache.additional = frameInfo.flags;  in unwind_phase2_forced()
807   (*stop)(1, lastAction, exception_object->exception_class, exception_object,  in unwind_phase2_forced()
826   exception_object->unwinder_cache.reserved1 = 0;  in _Unwind_RaiseException()
851 /// Note: re-throwing an exception (as opposed to continuing the unwind)
862   if (exception_object->unwinder_cache.reserved1)  in _Unwind_Resume()
865         (_Unwind_Stop_Fn)exception_object->unwinder_cache.reserved1,  in _Unwind_Resume()
866         (void *)exception_object->unwinder_cache.reserved3);  in _Unwind_Resume()
888 // Only used in _LIBUNWIND_TRACE_API, which is a no-op when assertions are
931         // Can only touch d0-15 with FSTMFDX.  in _Unwind_VRS_Set()
964       // There's only one pseudo-register, PAC, with regno == 0.  in _Unwind_VRS_Set()
994         // Can only touch d0-15 with FSTMFDX.  in _Unwind_VRS_Get_Internal()
1027       // There's only one pseudo-register, PAC, with regno == 0.  in _Unwind_VRS_Get_Internal()
1113         // SP is only 32-bit aligned so don't copy 64-bit at a time.  in _Unwind_VRS_Pop()
1135       // Return Address Authentication code (PAC) - discriminator 0  in _Unwind_VRS_Pop()
1163   exception_object->unwinder_cache.reserved1 = (uintptr_t)stop;  in _Unwind_ForcedUnwind()
1164   exception_object->unwinder_cache.reserved3 = (uintptr_t)stop_parameter;  in _Unwind_ForcedUnwind()
1191   if (exception_object->exception_cleanup != NULL)  in _Unwind_DeleteException()
1192     (*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT,  in _Unwind_DeleteException()