--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/compsupp/symaehabi/unwind_pr.c Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,840 @@
+/* unwind_pr.c - ARM-defined model personality routines
+ *
+ * Copyright 2002-2005 ARM Limited. All rights reserved.
+ *
+ * Your rights to use this code are set out in the accompanying licence
+ * text file LICENCE.txt (ARM contract number LEC-ELA-00080 v1.0).
+ */
+
+/* Portions copyright Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). */
+
+/*
+ * RCS $Revision: 92986 $
+ * Checkin $Date: 2005-10-13 15:56:12 +0100 (Thu, 13 Oct 2005) $
+ * Revising $Author: achapman $
+ */
+
+#include <cstdlib>
+/* Environment: */
+#include "unwind_env.h"
+/* Language-independent unwinder declarations: */
+#include "unwinder.h"
+
+/* Define PR_DIAGNOSTICS for printed diagnostics from the personality routine */
+
+#ifdef __EPOC32__
+/* Symbian specific support */
+#include "symbian_support.h"
+#endif
+
+#ifdef PR_DIAGNOSTICS
+#ifndef __EPOC32__
+extern int printf(const char *, ...);
+#endif
+#endif
+
+
+/* Forward decl: */
+extern _Unwind_Reason_Code __ARM_unwind_cpp_prcommon(_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ uint32_t idx);
+
+/* Personality routines - external entry points.
+ * pr0: short unwind description, 16 bit EHT offsets.
+ * pr1: long unwind description, 16 bit EHT offsets.
+ * pr2: long unwind description, 32 bit EHT offsets.
+ */
+
+#ifdef pr0_c
+_Unwind_Reason_Code __aeabi_unwind_cpp_pr0(_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context) {
+ return __ARM_unwind_cpp_prcommon(state, ucbp, context, 0);
+}
+#endif
+
+#ifdef pr1_c
+EXPORT_C _Unwind_Reason_Code __aeabi_unwind_cpp_pr1(_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context) {
+ return __ARM_unwind_cpp_prcommon(state, ucbp, context, 1);
+}
+#endif
+
+#ifdef pr2_c
+EXPORT_C _Unwind_Reason_Code __aeabi_unwind_cpp_pr2(_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context) {
+ return __ARM_unwind_cpp_prcommon(state, ucbp, context, 2);
+}
+#endif
+
+/* The rest of the file deals with the common routine */
+
+#ifdef prcommon_c
+
+/* C++ exceptions ABI required here:
+ * Declare protocol routines called by the personality routine.
+ * These are weak references so that referencing them here is
+ * insufficient to pull them into the image - they will only be
+ * included if application code uses a __cxa routine.
+ */
+
+typedef unsigned char bool;
+static const bool false = 0;
+static const bool true = !false;
+
+typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
+
+IMPORT_C WEAKDECL void __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
+IMPORT_C WEAKDECL bool __cxa_begin_cleanup(_Unwind_Control_Block *ucbp);
+typedef enum {
+ ctm_failed = 0,
+ ctm_succeeded = 1,
+ ctm_succeeded_with_ptr_to_base = 2
+ } __cxa_type_match_result;
+IMPORT_C WEAKDECL __cxa_type_match_result __cxa_type_match(_Unwind_Control_Block *ucbp,
+ const type_info *rttip,
+ bool is_reference_type,
+ void **matched_object);
+
+/* ----- Helper routines, private ----- */
+
+/* R_ARM_PREL31 is a place-relative 31-bit signed relocation. The
+ * routine takes the address of a location that was relocated by
+ * R_ARM_PREL31, and returns an absolute address.
+ */
+static FORCEINLINE uint32_t __ARM_resolve_prel31(void *p)
+{
+ return (uint32_t)((((*(int32_t *)p) << 1) >> 1) + (int32_t)p);
+}
+
+/* --------- VRS manipulation: --------- */
+
+#define R_SP 13
+#define R_LR 14
+#define R_PC 15
+
+static FORCEINLINE uint32_t core_get(_Unwind_Context *context, uint32_t regno)
+{
+ uint32_t val;
+ /* This call is required to never fail if given a valid regno */
+ _Unwind_VRS_Get(context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
+ return val;
+}
+
+static FORCEINLINE void core_set(_Unwind_Context *context, uint32_t regno, uint32_t newval)
+{
+ /* This call is required to never fail if given a valid regno */
+ _Unwind_VRS_Set(context, _UVRSC_CORE, regno, _UVRSD_UINT32, &newval);
+}
+
+static FORCEINLINE uint32_t count_to_mask(uint32_t count) {
+ return (1 << count) - 1;
+}
+
+/* --------- Support for unwind instruction stream: --------- */
+
+#define CODE_FINISH (0xb0)
+
+typedef struct uwdata {
+ uint32_t unwind_word; /* current word of unwind description */
+ uint32_t *unwind_word_pointer; /* ptr to next word */
+ uint8_t unwind_word_bytes_remaining; /* count of bytes left in current word */
+ uint8_t unwind_words_remaining; /* count of words left, at ptr onwards */
+} uwdata;
+
+static INLINE uint8_t next_unwind_byte(uwdata *u) {
+ uint8_t ub;
+ if (u->unwind_word_bytes_remaining == 0) { /* Load another word */
+ if (u->unwind_words_remaining == 0) return CODE_FINISH; /* nothing left - yield NOP */
+ u->unwind_words_remaining--;
+ u->unwind_word = *(u->unwind_word_pointer++);
+ u->unwind_word_bytes_remaining = 4;
+ }
+
+ u->unwind_word_bytes_remaining--;
+ ub = (u->unwind_word & 0xff000000) >> 24;
+ u->unwind_word <<= 8;
+ return ub;
+}
+
+
+/* --------- Personality routines: --------- */
+
+/* The C++ Standard is silent on what is supposed to happen if an internal
+ * inconsistency occurs during unwinding. In our design, we return to the
+ * caller with _URC_FAILURE. During phase 1 this causes a return from the
+ * language-independent unwinder to its caller (__cxa_throw or __cxa_rethrow)
+ * which will then call terminate(). If an error occurs during phase 2, the
+ * caller will call abort().
+ */
+
+/* Types to assist with reading EHT's */
+
+typedef struct {
+ uint16_t length;
+ uint16_t offset;
+} EHT16;
+
+typedef struct {
+ uint32_t length;
+ uint32_t offset;
+} EHT32;
+
+typedef uint32_t landingpad_t;
+
+typedef struct {
+ landingpad_t landingpad;
+} EHT_cleanup_tail;
+
+typedef struct {
+ landingpad_t landingpad;
+ uint32_t rtti_ref;
+} EHT_catch_tail;
+
+typedef struct {
+ uint32_t rtti_count; /* table count (possibly 0) */
+ uint32_t (rtti_refs[1]); /* variable length table, possibly followed by landing pad */
+} EHT_fnspec_tail;
+
+
+/* Macros: */
+
+/* Barrier cache: */
+/* Requirement imposed by C++ semantics module - pointer to match object in slot 0: */
+#define BARRIER_HANDLEROBJECT (0)
+/* Requirement imposed by C++ semantics module - function exception spec info */
+#define BARRIER_FNSPECCOUNT (1)
+#define BARRIER_FNSPECBASE (2)
+#define BARRIER_FNSPECSTRIDE (3)
+#define BARRIER_FNSPECARRAY (4)
+/* Private use for us until catch handler entry complete: */
+#define BARRIER_TEMPORARYMATCHOBJECT (1)
+/* Private use for us between phase 1 & 2: */
+#define BARRIER_EHTP (2)
+
+#define SAVE_CATCH_PROPAGATION_BARRIER(UCB_PTR,VSP,EHTP,HANDLEROBJECT) \
+ (UCB_PTR)->barrier_cache.sp = (VSP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_EHTP] = (uint32_t)(EHTP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_HANDLEROBJECT] = (uint32_t)(HANDLEROBJECT);
+
+#define SAVE_CATCH_OF_BASEPTR_PROPAGATION_BARRIER(UCB_PTR,VSP,EHTP,HANDLEROBJECT) \
+ (UCB_PTR)->barrier_cache.sp = (VSP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_EHTP] = (uint32_t)(EHTP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_TEMPORARYMATCHOBJECT] = (uint32_t)(HANDLEROBJECT); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_HANDLEROBJECT] = (uint32_t)&((UCB_PTR)->barrier_cache.bitpattern[BARRIER_TEMPORARYMATCHOBJECT]);
+
+#define SAVE_FNSPEC_PROPAGATION_BARRIER(UCB_PTR,VSP,EHTP) \
+ (UCB_PTR)->barrier_cache.sp = (VSP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_EHTP] = (uint32_t)(EHTP); \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_HANDLEROBJECT] = (uint32_t)0;
+
+#define CHECK_FOR_PROPAGATION_BARRIER(UCB_PTR,VSP,EHTP) \
+ ((UCB_PTR)->barrier_cache.sp == (VSP) && \
+ (UCB_PTR)->barrier_cache.bitpattern[BARRIER_EHTP] == (uint32_t)(EHTP))
+
+
+/* Cleanup cache: We only use one field */
+#define CLEANUP_EHTP (0)
+
+
+/* Special catch rtti values */
+#define CATCH_ALL (0xffffffff)
+#define CATCH_ALL_AND_TERMINATE (0xfffffffe)
+/* Landing pad bit for catching a reference type */
+#define CATCH_REFERENCE (0x80000000)
+
+
+/* Common personality routine: receives pr index as an argument.
+ *
+ * Note this implementation contains no explicit check against attempting to
+ * unwind off the top of the stack. Instead it relies (in cooperation with
+ * the language-independent unwinder) on there being a propagation barrier
+ * somewhere on the stack, perhaps the caller to main being not
+ * unwindable. An alternative would be to check for the stack pointer
+ * addressing a stack limit symbol.
+ */
+
+_Unwind_Reason_Code __ARM_unwind_cpp_prcommon(_Unwind_State state,
+ _Unwind_Control_Block *ucbp,
+ _Unwind_Context *context,
+ uint32_t idx)
+{
+ _Unwind_EHT_Header *eht_startp; /* EHT start pointer */
+ uint8_t *ehtp; /* EHT pointer, incremented as required */
+ /* Flag for fnspec violations in which the frame should be unwound before calling unexpected() */
+ bool phase2_call_unexpected_after_unwind;
+ /* Flag for whether we have loaded r15 (pc) with a return address while executing
+ * unwind instructions.
+ * Set this on any write to r15 while executing the unwind instructions.
+ */
+ bool wrote_pc = false;
+ /* Flag for whether we have loaded r14 (lr) with a return address while executing
+ * unwind instructions.
+ * Set this on any write to r14 while executing the unwind instructions.
+ */
+ bool wrote_lr = false;
+ /* Flag for whether we loaded r15 from r14 while executing the unwind instructions */
+ bool wrote_pc_from_lr = false;
+ uwdata ud;
+
+ /* Are we version 2 of the EHABI ? */
+ bool ehabiv2 = EHABI_V2(ucbp);
+
+ /* Mark all as well and extract the EHT pointer */
+
+ eht_startp = ucbp->pr_cache.ehtp;
+
+#ifdef PR_DIAGNOSTICS
+ printf("PR entered: state=%d, r15=0x%x, fnstart=0x%x\n",
+ state, core_get(context, R_PC), ucbp->pr_cache.fnstart);
+#endif
+
+ /* What are we supposed to do? */
+
+ if (state != _US_VIRTUAL_UNWIND_FRAME &&
+ state != _US_UNWIND_FRAME_STARTING &&
+ state != _US_UNWIND_FRAME_RESUME) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_UNSPECIFIED);
+ return _URC_FAILURE;
+ }
+
+ phase2_call_unexpected_after_unwind = false;
+
+ /* Traverse the current EHT, if there is one.
+ * The required behaviours are:
+ * _US_VIRTUAL_UNWIND_FRAME: search for a propagation barrier in this frame.
+ * otherwise look for the propagation barrier we found in phase 1,
+ * performing cleanups on the way. In this case if state will be one of:
+ * _US_UNWIND_FRAME_STARTING first time with this frame
+ * _US_UNWIND_FRAME_RESUME not first time, we are part-way through the EHT.
+ */
+
+ if ((ucbp->pr_cache.additional & 1) == 0) { /* EHT inline in index table? */
+ /* No: thus there is a real EHT */
+
+ if (state == _US_UNWIND_FRAME_RESUME) {
+ /* Recover saved pointer to next EHT entry */
+ ehtp = (uint8_t *)ucbp->cleanup_cache.bitpattern[CLEANUP_EHTP];
+#ifdef PR_DIAGNOSTICS
+ printf("PR EHT recovered pointer 0x%x\n", (int)ehtp);
+#endif
+ } else {
+ /* Point at the first EHT entry.
+ * For pr0, the unwind description is entirely within the header word.
+ * For pr1 & pr2, an unwind description extension word count is
+ * held in bits 16-23 of the header word.
+ */
+ uint32_t unwind_extension_word_count = (idx == 0 ? 0 : ((*eht_startp) >> 16) & 0xff);
+ ehtp = (uint8_t *)(eht_startp + 1 + unwind_extension_word_count);
+
+#ifdef PR_DIAGNOSTICS
+ printf("PR EHT first entry at 0x%x\n", (int)ehtp);
+#endif
+ }
+
+ /* scan ... */
+
+ while (1) {
+
+ /* Extract 32 bit length and offset */
+ uint32_t length;
+ uint32_t offset;
+ if (idx == 2) {
+ /* 32 bit offsets */
+ length = ((EHT32 *)ehtp)->length;
+ if (length == 0) break; /* end of table */
+ offset = ((EHT32 *)ehtp)->offset;
+ ehtp += sizeof(EHT32);
+ } else {
+ /* 16 bit offsets */
+ length = ((EHT16 *)ehtp)->length;
+ if (length == 0) break; /* end of table */
+ offset = ((EHT16 *)ehtp)->offset;
+ ehtp += sizeof(EHT16);
+ }
+
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got entry at 0x%x code=%d, length=0x%x, offset=0x%x\n",
+ (int)(ehtp-4), ((offset & 1) << 1) | (length & 1),
+ length & ~1, offset & ~1);
+#endif
+
+ /* Dispatch on the kind of entry */
+ switch (((offset & 1) << 1) | (length & 1)) {
+ case 0: /* cleanup */
+ if (state == _US_VIRTUAL_UNWIND_FRAME) {
+ /* Not a propagation barrier - skip */
+ } else {
+ /* Phase 2: call the cleanup if the return address is in range */
+ uint32_t padaddress;
+ uint32_t rangestartaddr = ucbp->pr_cache.fnstart + offset;
+ uint32_t rtn_addr = core_get(context, R_PC);
+ if (rangestartaddr <= rtn_addr && rtn_addr < rangestartaddr + length) {
+ /* It is in range. */
+ /* We need both of these to support v1 and v2 */
+ landingpad_t *landingpadp = &((EHT_cleanup_tail *)ehtp)->landingpad;
+ landingpad_t landingpad = *landingpadp;
+ ehtp += sizeof(EHT_cleanup_tail);
+ /* Dump state into the ECO so we resume correctly after the cleanup. */
+ /* We simply save the address of the next EHT entry. */
+ ucbp->cleanup_cache.bitpattern[CLEANUP_EHTP] = (uint32_t)ehtp;
+ if (!__cxa_begin_cleanup(ucbp)) {
+ /* Should be impossible, using ARM's library */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_UNSPECIFIED);
+ return _URC_FAILURE;
+ }
+ /* Set up the VRS to enter the landing pad. */
+ padaddress = ehabiv2 ?
+ __ARM_resolve_prel31(landingpadp) :
+ ER_RO_OFFSET_TO_ADDR(landingpad,ucbp);
+ core_set(context, R_PC, padaddress);
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got cleanup in range, cleanup addr=0x%x\n", core_get(context, R_PC));
+ printf("PR Saving EHT pointer 0x%x\n", (int)ehtp);
+#endif
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_PADENTRY, padaddress);
+ /* Exit requesting upload the VRS to the real machine. */
+ return _URC_INSTALL_CONTEXT;
+ }
+ }
+ /* Phase 1, or phase 2 and not in range */
+ ehtp += sizeof(EHT_cleanup_tail);
+ break;
+ case 1: /* catch */
+ {
+ if (state == _US_VIRTUAL_UNWIND_FRAME) {
+ /* In range, and with a matching type? */
+ uint32_t rangestartaddr = ucbp->pr_cache.fnstart + offset;
+ uint32_t rtn_addr = core_get(context, R_PC);
+ void *matched_object;
+ length -= 1; /* length had low bit set - clear it */
+ if (rangestartaddr <= rtn_addr && rtn_addr < rangestartaddr + length) {
+ /* In range */
+ __cxa_type_match_result matched_result;
+ uint32_t *rtti_ref = &((EHT_catch_tail *)ehtp)->rtti_ref;
+ uint32_t rtti_val = *rtti_ref;
+ if (rtti_val == CATCH_ALL_AND_TERMINATE) {
+ /* Always matches and causes propagation failure in phase 1 */
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got CATCH_ALL_AND_TERMINATE in phase 1\n");
+#endif
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_NOUNWIND);
+ return _URC_FAILURE;
+ } else if (rtti_val == CATCH_ALL) {
+ matched_object = ucbp + 1;
+ matched_result = ctm_succeeded;
+ } else {
+ bool is_reference_type = ((uint32_t)(((EHT_catch_tail *)ehtp)->landingpad) & CATCH_REFERENCE)
+ == CATCH_REFERENCE;
+ rtti_val = ehabiv2 ?
+ (uint32_t)__ARM_resolve_target2((void *)rtti_ref) :
+ (uint32_t)ER_RO_OFFSET_TO_ADDR(rtti_val, ucbp);
+ matched_result =__cxa_type_match(ucbp,
+ (type_info *)rtti_val,
+ is_reference_type,
+ &matched_object);
+ }
+ if (matched_result != ctm_failed) {
+ /* In range and matches.
+ * Record the propagation barrier details for ease of detection in phase 2.
+ * We save a pointer to the middle of the handler entry -
+ * this is fine, so long as we are consistent about it.
+ */
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got barrier in phase 1, result %d\n", (int)matched_result);
+ printf("PR Matched object address 0x%8.8x\n", matched_object);
+#endif
+ if (matched_result == ctm_succeeded_with_ptr_to_base) {
+ SAVE_CATCH_OF_BASEPTR_PROPAGATION_BARRIER(ucbp, core_get(context, R_SP),
+ ehtp, matched_object);
+
+ } else {
+ SAVE_CATCH_PROPAGATION_BARRIER(ucbp, core_get(context, R_SP),
+ ehtp, matched_object);
+ }
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_BARRIERFOUND,
+ (ehabiv2 ?
+ __ARM_resolve_prel31(&((EHT_catch_tail *)ehtp)->landingpad) :
+ ER_RO_OFFSET_TO_ADDR(((EHT_catch_tail *)ehtp)->landingpad, ucbp)));
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_CPP_TYPEINFO, rtti_val);
+ return _URC_HANDLER_FOUND;
+ }
+ }
+ /* Not in range or no type match - fall thru to carry on scanning the table */
+ } else {
+ /* Else this is phase 2: have we encountered the saved barrier? */
+ if (CHECK_FOR_PROPAGATION_BARRIER(ucbp, core_get(context, R_SP), ehtp)) {
+ /* Yes we have.
+ * Set up the VRS to enter the landing pad,
+ * and upload the VRS to the real machine.
+ */
+ landingpad_t *landingpadp = &((EHT_catch_tail *)ehtp)->landingpad;
+ landingpad_t landingpad = *landingpadp;
+ uint32_t padaddress = ehabiv2 ?
+ __ARM_resolve_prel31(landingpadp) :
+ ER_RO_OFFSET_TO_ADDR(landingpad, ucbp);
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got catch barrier in phase 2\n");
+#endif
+ core_set(context, R_PC, padaddress);
+ core_set(context, 0, (uint32_t)ucbp);
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_PADENTRY, padaddress);
+ /* Exit requesting upload the VRS to the real machine. */
+ return _URC_INSTALL_CONTEXT;
+ }
+ }
+ /* Else carry on scanning the table */
+ ehtp += sizeof(EHT_catch_tail);
+ break;
+ }
+ case 2: /* function exception specification (fnspec) */
+ {
+ uint32_t counter_word = ((EHT_fnspec_tail *)ehtp)->rtti_count;
+ uint32_t rtti_count = counter_word & 0x7fffffff; /* Extract offset count */
+ if (state == _US_VIRTUAL_UNWIND_FRAME) {
+ /* Phase 1 */
+ /* In range? Offset had low bit set - clear it */
+ uint32_t rangestartaddr = ucbp->pr_cache.fnstart + offset - 1;
+ uint32_t rtn_addr = core_get(context, R_PC);
+ if (rangestartaddr <= rtn_addr && rtn_addr < rangestartaddr + length) {
+ /* See if any type matches */
+ uint32_t *rttipp = &((EHT_fnspec_tail *)ehtp)->rtti_refs[0];
+ uint32_t i;
+ for (i = 0; i < rtti_count; i++) {
+ void *matched_object;
+ type_info * artti;
+ if (ehabiv2)
+ artti = (type_info *)__ARM_resolve_target2(rttipp);
+ else
+ artti = (type_info *)ER_RO_OFFSET_TO_ADDR(*rttipp, ucbp);
+ if (__cxa_type_match(ucbp, artti, false, &matched_object)) {
+#ifdef PR_DIAGNOSTICS
+ printf("PR Fnspec matched in phase 1\n");
+#endif
+ break;
+ }
+ rttipp++;
+ }
+
+ if (i == rtti_count) { /* NB case rtti_count==0 forces no match [for throw()] */
+ /* No match - fnspec violation is a propagation barrier */
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got fnspec barrier in phase 1\n");
+#endif
+ SAVE_FNSPEC_PROPAGATION_BARRIER(ucbp, core_get(context, R_SP), ehtp); /* save ptr to the count of types */
+ /* Even if this is a fnspec with a landing pad, we always end up in
+ * __cxa_call_unexpected so tell the debugger thats where we're going
+ */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_BARRIERFOUND, &__cxa_call_unexpected);
+ return _URC_HANDLER_FOUND;
+ }
+ } /* if (in range...) */
+
+ /* Fall out of the 'if' to continue table scanning */
+
+ } else {
+ /* Else this is phase 2: have we encountered the saved barrier? */
+ if (CHECK_FOR_PROPAGATION_BARRIER(ucbp, core_get(context, R_SP), ehtp)) {
+ /* Yes we have. Fill in the UCB barrier_cache for entry to __cxa_call_unexpected */
+ uint32_t *p = (uint32_t *)ehtp; /* ptr to rtti count */
+ ucbp->barrier_cache.bitpattern[BARRIER_FNSPECCOUNT] = rtti_count;
+ ucbp->barrier_cache.bitpattern[BARRIER_FNSPECBASE] = ehabiv2 ? 0 :ER_RO_OFFSET_TO_ADDR(0, ucbp);
+ ucbp->barrier_cache.bitpattern[BARRIER_FNSPECSTRIDE] = 4; /* stride */
+ ucbp->barrier_cache.bitpattern[BARRIER_FNSPECARRAY] = (uint32_t)(p + 1); /* address of rtti offset list */
+
+ /* If this is a fnspec with an attached landing pad, we must enter
+ * the pad immediately. Otherwise we need to unwind the frame before
+ * calling __cxa_call_unexpected() so set a flag to make this happen.
+ */
+ if (counter_word == rtti_count)
+ phase2_call_unexpected_after_unwind = true; /* no pad, enter later */
+ else { /* pad */
+ landingpad_t *landingpadp;
+ landingpad_t landingpad;
+ uint32_t padaddress;
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got fnspec barrier in phase 2 (immediate entry)\n");
+#endif
+ ehtp += (sizeof(((EHT_fnspec_tail *)ehtp)->rtti_count) +
+ sizeof(uint32_t) * rtti_count); /* point at pad offset */
+ landingpadp = (landingpad_t *)ehtp;
+ landingpad = *(landingpad_t *)ehtp;
+ padaddress = ehabiv2 ?
+ __ARM_resolve_prel31(landingpadp) :
+ ER_RO_OFFSET_TO_ADDR(landingpad, ucbp);
+ core_set(context, 0, (uint32_t)ucbp);
+ core_set(context, R_PC, padaddress);
+ /* Even if this is a fnspec with a landing pad, in phase 1 we said we'd
+ * end up in __cxa_call_unexpected so show the same thing now
+ */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_PADENTRY, &__cxa_call_unexpected);
+ return _URC_INSTALL_CONTEXT;
+ }
+ } /* endif (barrier match) */
+ } /* endif (which phase) */
+
+ /* Advance to the next item, remembering to skip the landing pad if present */
+ ehtp += (sizeof(((EHT_fnspec_tail *)ehtp)->rtti_count) +
+ sizeof(uint32_t) * rtti_count +
+ (counter_word == rtti_count ? 0 : sizeof(landingpad_t)));
+ break;
+ }
+ case 3: /* unallocated */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_TABLECORRUPT);
+ return _URC_FAILURE;
+ } /* switch */
+
+ } /* while (1) */
+
+#ifdef PR_DIAGNOSTICS
+ printf("PR Reached end of EHT\n");
+#endif
+
+ } /* if out-of-line EHT */
+
+
+ /* Do a virtual unwind of this frame - load the first unwind bytes then loop.
+ * Loop exit is by executing opcode CODE_FINISH.
+ */
+
+ ud.unwind_word = *(uint32_t *)eht_startp; /* first word */
+ ud.unwind_word_pointer = (uint32_t *)eht_startp + 1; /* ptr to extension words, if any */
+ if (idx == 0) { /* short description */
+ ud.unwind_words_remaining = 0; /* no further words */
+ ud.unwind_word <<= 8; /* 3 explicit unwind bytes in this word */
+ ud.unwind_word_bytes_remaining = 3;
+ } else { /* long description: extension word count in bits 16-23 */
+ ud.unwind_words_remaining = ((ud.unwind_word) >> 16) & 0xff;
+ ud.unwind_word <<= 16; /* 2 explicit unwind bytes in this word */
+ ud.unwind_word_bytes_remaining = 2;
+ }
+
+#ifdef PR_DIAGNOSTICS
+ /* debug_print_vrs(context); */
+#endif
+
+ while (1) {
+ uint8_t ub = next_unwind_byte(&ud);
+
+#ifdef PR_DIAGNOSTICS
+ printf("PR Unwind byte 0x%x\n", ub);
+#endif
+
+ /* decode and execute the current byte ... */
+
+ if (ub == CODE_FINISH) { /* finished unwinding */
+ if (!wrote_pc) {
+ uint32_t lr;
+ if (!wrote_lr) {
+ /* If neither pc nor lr was written, the saved return address was
+ * not restored. This indicates broken unwind instructions.
+ */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_TABLECORRUPT);
+ return _URC_FAILURE;
+ }
+ _Unwind_VRS_Get(context, _UVRSC_CORE, R_LR, _UVRSD_UINT32, &lr);
+ core_set(context, R_PC, lr);
+ wrote_pc_from_lr = true;
+ }
+#ifdef PR_DIAGNOSTICS
+ {
+ uint32_t nextpc;
+ _Unwind_VRS_Get(context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &nextpc);
+ printf("PR Next PC is 0x%x\n", nextpc);
+ }
+#endif
+ break;
+ }
+ if (ub <= 0x3f) { /* 00nnnnnn: vsp += (nnnnnn << 2) + 4 */
+ uint32_t increment = ((ub & 0x3f) << 2) + 4;
+ core_set(context, R_SP, core_get(context, R_SP) + increment);
+ continue;
+ }
+ if (ub <= 0x7f) { /* 01xxxxxx: vsp -= (xxxxxx << 2) + 4 */
+ uint32_t decrement = ((ub & 0x3f) << 2) + 4;
+ core_set(context, R_SP, core_get(context, R_SP) - decrement);
+ continue;
+ }
+ if (ub <= 0x8f) { /* 100000000 00000000: refuse, 1000rrrr rrrrrrrr: pop integer regs */
+ uint32_t mask = (ub & 0xf) << 12;
+ ub = next_unwind_byte(&ud);
+ mask |= ub << 4;
+ if (mask == 0) { /* 10000000 00000000 refuse to unwind */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_NOUNWIND);
+ return _URC_FAILURE;
+ }
+ if (_Unwind_VRS_Pop(context, _UVRSC_CORE, mask, _UVRSD_UINT32) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ if (mask & (1 << R_PC)) wrote_pc = true;
+ if (mask & (1 << R_LR)) wrote_lr = true;
+ continue;
+ }
+ if (ub <= 0x9f) { /* 1001nnnn: vsp = r[nnnn] if not 13,15 */
+ uint8_t regno = ub & 0xf;
+ if (regno == 13 || regno == R_PC) { /* reserved */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+ core_set(context, R_SP, core_get(context, regno));
+ continue;
+ }
+ if (ub <= 0xaf) { /* 1010xnnn: pop r4-r[4+nnn], +r14 if x */
+ uint32_t mask = count_to_mask((ub & 0x7) + 1) << 4;
+ if (ub & 0x8) {
+ mask |= (1 << R_LR);
+ wrote_lr = true;
+ }
+ if (_Unwind_VRS_Pop(context, _UVRSC_CORE, mask, _UVRSD_UINT32) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ if (ub <= 0xb7) {
+ /* if (ub == 0xb0) is CODE_FINISH, handled earlier */
+ if (ub == 0xb1) { /* 10110001 0000iiii pop integer regs, others reserved */
+ uint32_t mask = next_unwind_byte(&ud);
+ if (mask == 0 || mask > 0xf) { /* reserved */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+ if (_Unwind_VRS_Pop(context, _UVRSC_CORE, mask, _UVRSD_UINT32) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ if (ub == 0xb2) { /* 10110010 uleb128 : vsp += (uleb128 << 2) + 0x204 */
+ uint32_t u = 0;
+ uint32_t n = 0;
+ /* decode */
+ while (1) {
+ ub = next_unwind_byte(&ud);
+ u |= (ub & 0x7f) << n;
+ if ((ub & 0x80) == 0) break;
+ n += 7;
+ }
+ core_set(context, R_SP, core_get(context, R_SP) + (u << 2) + 0x204);
+ continue;
+ }
+ if (ub == 0xb3) { /* 10110011: pop vfp from FSTMFDX */
+ uint32_t discriminator = next_unwind_byte(&ud);
+ discriminator = ((discriminator & 0xf0) << 12) | ((discriminator & 0x0f) + 1);
+ if (_Unwind_VRS_Pop(context, _UVRSC_VFP, discriminator, _UVRSD_VFPX) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ { /* 101101nn: was pop fpa, now spare */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+ } /* if (ub <= 0xb7) ... */
+ if (ub <= 0xbf) { /* 10111nnn: pop vfp from FSTMFDX */
+ uint32_t discriminator = 0x80000 | ((ub & 0x7) + 1);
+ if (_Unwind_VRS_Pop(context, _UVRSC_VFP, discriminator, _UVRSD_VFPX) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ if (ub <= 0xc7) {
+ if (ub == 0xc7) { /* 11000111: WMMX C regs */
+ uint32_t mask = next_unwind_byte(&ud);
+ if (mask == 0 || mask > 0xf) { /* reserved */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+ if (_Unwind_VRS_Pop(context, _UVRSC_WMMXC, mask, _UVRSD_UINT32) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ } else if (ub == 0xc6) { /* 11000110: WMMX D regs */
+ uint32_t discriminator = next_unwind_byte(&ud);
+ discriminator = ((discriminator & 0xf0) << 12) | ((discriminator & 0x0f) + 1);
+ if (_Unwind_VRS_Pop(context, _UVRSC_WMMXD, discriminator, _UVRSD_UINT64) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ } else {
+ /* 11000nnn (nnn != 6, 7): WMMX D regs */
+ uint32_t discriminator = 0xa0000 | ((ub & 0x7) + 1);
+ if (_Unwind_VRS_Pop(context, _UVRSC_WMMXD, discriminator, _UVRSD_UINT64) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ } /* if (ub <= 0xc7) ... */
+ if (ub == 0xc8 || /* 11001000 sssscccc: pop VFP hi regs from FSTMFDD */
+ ub == 0xc9) { /* 11001001 sssscccc: pop VFP from FSTMFDD */
+ uint32_t discriminator = next_unwind_byte(&ud);
+ discriminator = ((discriminator & 0xf0) << 12) | ((discriminator & 0x0f) + 1);
+ if (ub == 0xc8) discriminator += 16 << 16;
+ if (_Unwind_VRS_Pop(context, _UVRSC_VFP, discriminator, _UVRSD_DOUBLE) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ if (ub <= 0xcf) { /* spare */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+ if (ub <= 0xd7) { /* 11010nnn: pop VFP from FSTMFDD */
+ uint32_t discriminator = 0x80000 | ((ub & 0x7) + 1);
+ if (_Unwind_VRS_Pop(context, _UVRSC_VFP, discriminator, _UVRSD_DOUBLE) != _UVRSR_OK) {
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_VRSFAILED);
+ return _URC_FAILURE;
+ }
+ continue;
+ }
+ /* and in fact everything else is currently reserved or spare */
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_ENDING, _UAARG_ENDING_CPP_BADOPCODE);
+ return _URC_FAILURE;
+ }
+
+#ifdef PR_DIAGNOSTICS
+ /* debug_print_vrs(context); */
+#endif
+
+ /* The VRS has now been updated to reflect the virtual unwind.
+ * If we are dealing with an unmatched fnspec, pop intervening frames
+ * and call unexpected(). Else return to our caller with an
+ * indication to continue unwinding.
+ */
+
+ if (phase2_call_unexpected_after_unwind) {
+ /* Set up the VRS to enter __cxa_call_unexpected,
+ * and upload the VRS to the real machine.
+ * The barrier_cache was initialised earlier.
+ */
+#ifdef PR_DIAGNOSTICS
+ printf("PR Got fnspec barrier in phase 2 (unwinding completed)\n");
+#endif
+ core_set(context, 0, (uint32_t)ucbp);
+ if (!wrote_pc_from_lr) {
+ uint32_t pc;
+ /* Move the return address to lr to simulate a call */
+ _Unwind_VRS_Get(context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &pc);
+ core_set(context, R_LR, pc);
+ }
+ core_set(context, R_PC, (uint32_t)&__cxa_call_unexpected);
+ DEBUGGER_BOTTLENECK(ucbp, _UASUBSYS_CPP, _UAACT_PADENTRY, &__cxa_call_unexpected);
+ return _URC_INSTALL_CONTEXT;
+ }
+
+ /* Else continue with next frame */
+ return _URC_CONTINUE_UNWIND;
+}
+
+#endif
+/* end ifdef prcommon_c */