int __TI_ut_entry_cmp(const void *key, const void *entry)
{
#pragma diag_suppress 1107
const _Unwind_Table_Entry *ut_limit =
(_Unwind_Table_Entry *)(uintptr_t)__TI_UT_BaseLimit.UT_limit;
#pragma diag_default 1107
const _Unwind_Table_Entry *ut_entry = (_Unwind_Table_Entry *)entry;
const _Unwind_Table_Entry *ut_next_entry = ut_entry + 1;
_UINT32 pc_abs = *(_UINT32 *)key;
/*-----------------------------------------------------------------------*/
/* Only function start offsets are stored in the entries. For the last */
/* entry in the table, there is no "end" address for the function. Any */
/* PC value greater that the func start address will match the entry for */
/* that function */
/*-----------------------------------------------------------------------*/
_UINT32 next_func_abs =
(ut_next_entry != ut_limit) ?
__TI_prel2abs(&ut_next_entry->fn_offset) : 0xffffffff;
_UINT32 this_addr = __TI_prel2abs(&ut_entry->fn_offset);
#ifdef DEBUG_BSEARCH
printf("UW/BS: PC=%"PRIx32" entry=%p, "
"this_addr=%"PRIx32" next_addr=%"PRIx32"\n",
pc_abs, entry, this_addr, next_func_abs);
#endif /* DEBUG_BSEARCH */
if (pc_abs < this_addr) return -1;
else if (pc_abs >= next_func_abs) return 1;
else return 0;
}
INLINE static bool process_cleanup(_Unwind_Exception *uexcep,
_Unwind_Phase phase,
_Unwind_Context *context,
_UINT32 **descr_ptr,
_UINT32 length,
_UINT32 offset)
{
_UINT32 *p_lp = *descr_ptr;
_UINT32 range_start = uexcep->pr_data.func_start + offset;
_UINT32 curr_pc = __TI_targ_regbuf_get_pc(context);
#ifdef DEBUG_PR
printf("PR: (@ %p) Clean, Phase %d, "
"Len %"PRId32", Off %"PRIx32", lp %"PRIx32"\n",
*descr_ptr, phase, length, offset, **descr_ptr);
#endif /* DEBUG_PR */
/*-----------------------------------------------------------------------*/
/* Increment desc ptr beyond landing pad */
/*-----------------------------------------------------------------------*/
(*descr_ptr)++;
/*-----------------------------------------------------------------------*/
/* Phase 2, and PC is within the range, set up reg buff to call handler */
/*-----------------------------------------------------------------------*/
if (phase != _UP_Phase1 &&
curr_pc >= range_start && curr_pc < range_start+length)
{
/*-------------------------------------------------------------------*/
/* Save address of next EHT descriptor, to resume processing later */
/*-------------------------------------------------------------------*/
uexcep->cleanup_data.cleanup_ehtp = (_UINT32)(*descr_ptr);
/*-------------------------------------------------------------------*/
/* __cxa_begin_cleanup must be called before starting any cleanups */
/*-------------------------------------------------------------------*/
__cxa_begin_cleanup(uexcep);
/*-------------------------------------------------------------------*/
/* Set up registers to call cleanup landing pad */
/*-------------------------------------------------------------------*/
__TI_targ_regbuf_set_pc(context, __TI_prel2abs(p_lp));
return true;
}
return false;
}
static _Unwind_Reason_Code find_et_setup_pr(_Unwind_Exception *uexcep,
_UINT32 pc)
{
#pragma diag_suppress 1107
const _Unwind_Table_Entry *ut_base =
(_Unwind_Table_Entry *)(uintptr_t)__TI_UT_BaseLimit.UT_base;
const _Unwind_Table_Entry *ut_limit =
(_Unwind_Table_Entry *)(uintptr_t)__TI_UT_BaseLimit.UT_limit;
#pragma diag_default 1107
size_t num_entries = ut_limit - ut_base;
uexcep->unwinder_data.pr_addr = NULL;
/*-----------------------------------------------------------------------*/
/* Search for matching Unwind Table entry using pc */
/*-----------------------------------------------------------------------*/
_Unwind_Table_Entry *match_entry =
(_Unwind_Table_Entry *)bsearch((void *)&pc, (void *)ut_base,
num_entries, sizeof(_Unwind_Table_Entry),
__TI_ut_entry_cmp);
if (match_entry == NULL)
{
#ifdef DEBUG_UNWINDER
printf("UW: bsearch did not find PC %"PRIx32" in EXIDX\n", pc);
#endif /* DEBUG_UNWINDER */
return _URC_FAILURE;
}
#ifdef DEBUG_UNWINDER
printf("UW: PC=%"PRIx32" -> UTEntry @ %p, "
"Func %"PRIxMAX", Off %"PRIx32"\n",
pc, match_entry, (uintmax_t)__TI_prel2abs(&match_entry->fn_offset),
match_entry->et_offset);
#endif /* DEBUG_UNWINDER */
/*-----------------------------------------------------------------------*/
/* If entry indicates cant unwind, return failure */
/*-----------------------------------------------------------------------*/
if (match_entry->et_offset == UT_CANT_UNWIND) return _URC_FAILURE;
/*-----------------------------------------------------------------------*/
/* Store function start address (absolute) */
/*-----------------------------------------------------------------------*/
uexcep->pr_data.func_start = __TI_prel2abs(&match_entry->fn_offset);
/*-----------------------------------------------------------------------*/
/* Set up EHT related info in the UE. If et_offset MSB==1, EHT inlined */
/*-----------------------------------------------------------------------*/
if ((match_entry->et_offset & 0x80000000) != 0)
{
#ifdef DEBUG_UNWINDER
printf("UW: Inlined EHT\n");
#endif /* DEBUG_UNWINDER */
uexcep->pr_data.eht_start = (_UINT32 *)&match_entry->et_offset;
uexcep->pr_data.additional = 1;
}
else
{
#pragma diag_suppress 1107
uexcep->pr_data.eht_start =
(_UINT32 *)(uintptr_t)__TI_prel2abs(&match_entry->et_offset);
uexcep->pr_data.additional = 0;
#pragma diag_default 1107
#ifdef DEBUG_UNWINDER
printf("UW: Non-inlined EHT at %p\n", uexcep->pr_data.eht_start);
#endif /* DEBUG_UNWINDER */
}
/*-----------------------------------------------------------------------*/
/* Compute PR to call from the EHT entry, update UE with this PR */
/*-----------------------------------------------------------------------*/
if (!__TI_targ_set_pr(uexcep)) return _URC_FAILURE;
#ifdef DEBUG_UNWINDER
printf("UW: FAddr %"PRIx32", EAddr %p, I? %d, PAddr %"PRIx32"\n",
uexcep->pr_data.func_start, uexcep->pr_data.eht_start,
(int)uexcep->pr_data.additional, uexcep->unwinder_data.pr_addr);
#endif /* DEBUG_UNWINDER */
return _URC_SUCCESS;
}
INLINE static bool process_fespec (_Unwind_Exception *uexcep,
_Unwind_Phase phase,
_Unwind_Context *context,
_UINT32 **descr_ptr,
_UINT32 length,
_UINT32 offset,
_Unwind_Reason_Code *reason,
bool *ph2_call_unexpected)
{
bool reason_valid = false;
_UINT32 rtti_count = **descr_ptr;
_UINT32 range_start = uexcep->pr_data.func_start + offset;
bool call_unexpected;
_UINT32 curr_pc = __TI_targ_regbuf_get_pc(context);
_UINT32 sp = __TI_targ_regbuf_get_sp(context);
_UINT32 sb = __TI_targ_regbuf_get_sb(context);
/*-----------------------------------------------------------------------*/
/* The MSB in rtti_count is used to indicate a call to call_unexpected */
/* MSB ==0, use call_unexpected, MSB ==1, use handler supplied in descr */
/*-----------------------------------------------------------------------*/
call_unexpected = (rtti_count & 0x80000000) ? false : true;
rtti_count &= 0x7fffffff;
#ifdef DEBUG_PR
printf("PR: (@ %p) Fspec, Len %"PRId32", "
"Off %"PRIx32", Count %"PRIx32"\n",
*descr_ptr, length, offset, rtti_count);
#endif /* DEBUG_PR */
/*-----------------------------------------------------------------------*/
/* Phase 1, check if fespec forms a propagation barrier */
/*-----------------------------------------------------------------------*/
if (phase == _UP_Phase1)
{
if (curr_pc >= range_start && curr_pc < range_start+length)
{
/*---------------------------------------------------------------*/
/* Check list of rtti types for match */
/*---------------------------------------------------------------*/
void *matched;
_UINT32 idx;
for (idx=0; idx < rtti_count; idx++)
{
_UINT32 rtti_offset = (_UINT32)*((*descr_ptr) + idx + 1);
_UINT32 rtti_address = __TI_targ_rtti_address(rtti_offset,
context);
#pragma diag_suppress 1107
if (__cxa_type_match(uexcep,
(std::type_info *)(uintptr_t)rtti_address,
&matched))
break;
#pragma diag_default 1107
}
/*---------------------------------------------------------------*/
/* If no match, exception should not propagate beyond this func */
/* save propagation barrier */
/*---------------------------------------------------------------*/
if (idx == rtti_count)
{
#ifdef DEBUG_PR
printf("PR: Found fespec propagation barrier\n");
#endif /* DEBUG_PR */
/*-----------------------------------------------------------*/
/* Save propagation barrier: SP and ptr to descr (Sec 7.3/5) */
/*-----------------------------------------------------------*/
uexcep->barrier_data.sp = sp;
uexcep->barrier_data.data[1] = (_UINT32)*descr_ptr;
/*-----------------------------------------------------------*/
/* cxa_begin_catch requires matched type in 0, Sec 8.2 - it */
/* is called from cxa_call_unexpected. */
/*-----------------------------------------------------------*/
uexcep->barrier_data.data[0] = (_UINT32)matched;
*reason = _URC_HANDLER_FOUND;
reason_valid = true;
}
}
}
/*-----------------------------------------------------------------------*/
/* Phase 2, check for a previously saved propagation barrier */
/*-----------------------------------------------------------------------*/
else
{
if (sp == uexcep->barrier_data.sp &&
(_UINT32)*descr_ptr == uexcep->barrier_data.data[1])
{
/*---------------------------------------------------------------*/
/* Set up barrier cache with required data - Sec 8.2 */
/*---------------------------------------------------------------*/
uexcep->barrier_data.data[1] = rtti_count;
uexcep->barrier_data.data[2] = sb;
uexcep->barrier_data.data[3] = 4;
uexcep->barrier_data.data[4] = (_UINT32)((*descr_ptr)+1);
/*---------------------------------------------------------------*/
/* If descriptor specifies a landing pad, call landing pad else */
/* call cxa_call_unexpected _after_ unwinding */
/* Sec 8.5.3 - any permitted throw out of unexpected() must */
/* behave as if unwinding resumes at the call site to the func */
/* whose exception specification was violated. */
/*---------------------------------------------------------------*/
if (!call_unexpected)
{
_UINT32 *p_lp_offset = ((*descr_ptr) + 1 + rtti_count);
__TI_targ_regbuf_set_pc(context, __TI_prel2abs(p_lp_offset));
__TI_targ_setup_call_parm0(context, (_UINT32)uexcep);
*reason = _URC_INSTALL_CONTEXT;
reason_valid = true;
}
else
*ph2_call_unexpected = true;
}
}
/*-----------------------------------------------------------------------*/
/* Skip over rtti count field, list of types & lp offset if any */
/*-----------------------------------------------------------------------*/
(*descr_ptr) += (rtti_count + 1 + (call_unexpected ? 0 : 1));
return reason_valid;
}
INLINE static bool process_catch(_Unwind_Exception *uexcep,
_Unwind_Phase phase,
_Unwind_Context *context,
_UINT32 **descr_ptr,
_UINT32 length,
_UINT32 offset,
_Unwind_Reason_Code *reason)
{
bool reason_valid = false;
_UINT32 *p_lp_offset = *descr_ptr;
_UINT32 rtti_offset = *(*descr_ptr+1);
_UINT32 range_start = uexcep->pr_data.func_start + offset;
_UINT32 curr_pc = __TI_targ_regbuf_get_pc(context);
_UINT32 sp = __TI_targ_regbuf_get_sp(context);
_UINT32 rtti_address = __TI_targ_rtti_address(rtti_offset, context);
#ifdef DEBUG_PR
printf("PR: (@ %p) Catch, Phase %d, "
"Len %"PRId32", Off %#"PRIx32", (%"PRIx32" - %"PRIx32") "
"lp %"PRIx32", type %"PRIx32" (offset = %"PRIx32")\n",
*descr_ptr, phase, length, offset, range_start, range_start+length,
*p_lp_offset, rtti_address, rtti_offset);
#endif /* DEBUG_PR */
/*-----------------------------------------------------------------------*/
/* Phase 1, Check if catch forms propagation barrier */
/*-----------------------------------------------------------------------*/
if (phase == _UP_Phase1)
{
/*-------------------------------------------------------------------*/
/* Check if PC is in range */
/*-------------------------------------------------------------------*/
if (curr_pc >= range_start && curr_pc < range_start+length)
{
/*---------------------------------------------------------------*/
/* Check for a type match, also check for catch all/terminate */
/*---------------------------------------------------------------*/
void *matched;
if (rtti_offset == CATCH_ANY_TERMINATE)
{
*reason = _URC_FAILURE;
reason_valid = true;
}
#pragma diag_suppress 1107
else if (rtti_offset == CATCH_ANY ||
__cxa_type_match(uexcep,
(std::type_info *)(uintptr_t)rtti_address,
&matched))
#pragma diag_default 1107
{
#ifdef DEBUG_PR
printf("PR: Found catch propagation barrier\n");
#endif /* DEBUG_PR */
/*-----------------------------------------------------------*/
/* Save propagation barrier: SP and ptr to descr (Sec 7.3/5) */
/*-----------------------------------------------------------*/
uexcep->barrier_data.sp = sp;
uexcep->barrier_data.data[1] = (_UINT32)*descr_ptr;
/*-----------------------------------------------------------*/
/* cxa_begin_catch requires matched type in 0, Sec 8.2 */
/*-----------------------------------------------------------*/
uexcep->barrier_data.data[0] = (_UINT32)matched;
*reason = _URC_HANDLER_FOUND;
reason_valid = true;
}
}
}
/*-----------------------------------------------------------------------*/
/* Phase 2 Start or Resume, check for barrier, set up catch handler */
/*-----------------------------------------------------------------------*/
else
{
/*-------------------------------------------------------------------*/
/* Check for a previously saved propagation barrier */
/*-------------------------------------------------------------------*/
if (sp == uexcep->barrier_data.sp &&
(_UINT32)*descr_ptr == uexcep->barrier_data.data[1])
{
/*---------------------------------------------------------------*/
/* Set up PC to call catch handler, set up UE ptr in R0 */
/*---------------------------------------------------------------*/
__TI_targ_regbuf_set_pc(context, __TI_prel2abs(p_lp_offset));
__TI_targ_setup_call_parm0(context, (_UINT32)uexcep);
*reason = _URC_INSTALL_CONTEXT;
reason_valid = true;
}
}
/*-----------------------------------------------------------------------*/
/* Increment desc ptr beyond landing pad & rtti offset */
/*-----------------------------------------------------------------------*/
(*descr_ptr) += 2;
return reason_valid;
}
