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uintptr_t typestable_base;
uint8_t callsites_enc;
const uint8_t *callsites, *actiontable;
};
extern _Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception*);
extern void* _Unwind_GetLanguageSpecificData(struct _Unwind_Context*);
extern uint64_t _Unwind_GetRegionStart(struct _Unwind_Context*);
extern uint64_t _Unwind_GetDataRelBase(struct _Unwind_Context*);
extern uint64_t _Unwind_GetTextRelBase(struct _Unwind_Context*);
extern uint64_t _Unwind_GetIP(struct _Unwind_Context*);
extern void _Unwind_SetIP(struct _Unwind_Context*, uint64_t);
extern void _Unwind_SetGR(struct _Unwind_Context*, int, uint64_t);
extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context*);
extern void _Unwind_SetIP(struct _Unwind_Context*, uintptr_t);
extern void _Unwind_SetGR(struct _Unwind_Context*, int, uintptr_t);
extern void _Unwind_DeleteException(struct _Unwind_Exception*);
static objc_uncaught_exception_handler uncaught_exception_handler;
static uint64_t
read_uleb128(const uint8_t **ptr)
{
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{
if (value == 0)
return 0;
value += ((enc & 0x70) == DW_EH_PE_pcrel ? (uintptr_t)start : base);
if (enc & DW_EH_PE_indirect)
value = *(uint64_t*)value;
value = *(uint64_t*)(uintptr_t)value;
return value;
}
static void
read_lsda(struct _Unwind_Context *ctx, const uint8_t *ptr, struct lsda *lsda)
{
uint8_t landingpads_start_enc;
uintptr_t callsites_size;
lsda->region_start = _Unwind_GetRegionStart(ctx);
lsda->landingpads_start = lsda->region_start;
lsda->typestable = NULL;
if ((landingpads_start_enc = *ptr++) != DW_EH_PE_omit)
lsda->landingpads_start =
read_value(landingpads_start_enc, &ptr);
(uintptr_t)read_value(landingpads_start_enc, &ptr);
if ((lsda->typestable_enc = *ptr++) != DW_EH_PE_omit) {
uintptr_t tmp = read_uleb128(&ptr);
uintptr_t tmp = (uintptr_t)read_uleb128(&ptr);
lsda->typestable = ptr + tmp;
}
lsda->typestable_base = get_base(ctx, lsda->typestable_enc);
lsda->callsites_enc = *ptr++;
callsites_size = read_uleb128(&ptr);
callsites_size = (uintptr_t)read_uleb128(&ptr);
lsda->callsites = ptr;
lsda->actiontable = lsda->callsites + callsites_size;
}
static BOOL
find_callsite(struct _Unwind_Context *ctx, struct lsda *lsda,
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ptr = lsda->callsites;
while (ptr < lsda->actiontable) {
uintptr_t callsite_start, callsite_len, callsite_landingpad;
uintptr_t callsite_action;
callsite_start = lsda->region_start +
read_value(lsda->callsites_enc, &ptr);
callsite_len = read_value(lsda->callsites_enc, &ptr);
callsite_landingpad = read_value(lsda->callsites_enc, &ptr);
callsite_action = read_uleb128(&ptr);
(uintptr_t)read_value(lsda->callsites_enc, &ptr);
callsite_len = (uintptr_t)read_value(lsda->callsites_enc, &ptr);
callsite_landingpad =
(uintptr_t)read_value(lsda->callsites_enc, &ptr);
callsite_action = (uintptr_t)read_uleb128(&ptr);
/* We can stop if we passed IP, as the table is sorted */
if (callsite_start >= ip)
break;
if (callsite_start + callsite_len >= ip) {
if (callsite_landingpad != 0)
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{
uint8_t found = 0;
const uint8_t *ptr;
intptr_t filter, displacement;
do {
ptr = actionrecords;
filter = read_sleb128(&ptr);
filter = (intptr_t)read_sleb128(&ptr);
/*
* Get the next action record. Since read_sleb128 modifies ptr,
* we first set the actionrecord to the current ptr and then
* add the displacement.
*/
actionrecords = ptr;
displacement = read_sleb128(&ptr);
displacement = (intptr_t)read_sleb128(&ptr);
actionrecords += displacement;
if (filter > 0 && !(actions & _UA_FORCE_UNWIND) && !foreign) {
Class class;
uintptr_t i, c;
const uint8_t *tmp;
i = filter * size_for_encoding(lsda->typestable_enc);
tmp = lsda->typestable - i;
c = read_value(lsda->typestable_enc, &tmp);
c = resolve_value(c, lsda->typestable_enc,
c = (uintptr_t)read_value(lsda->typestable_enc, &tmp);
c = (uintptr_t)resolve_value(c, lsda->typestable_enc,
lsda->typestable - i, lsda->typestable_base);
class = (c != 0 ? objc_get_class((const char*)c) : Nil);
if (class_matches(class, e->object)) {
*filtervalue = filter;
return (found | HANDLER_FOUND);
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*/
if (actions & _UA_HANDLER_FRAME && !foreign) {
/*
* For handlers, reg #0 must be the exception's object and reg
* #1 the filter.
*/
_Unwind_SetGR(ctx, __builtin_eh_return_data_regno(0),
__builtin_extend_pointer(e->object));
(uintptr_t)e->object);
_Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1),
e->filter);
_Unwind_SetIP(ctx, e->landingpad);
return _URC_INSTALL_CONTEXT;
}
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e->filter = filter;
}
return _URC_HANDLER_FOUND;
} else if (actions & _UA_CLEANUP_PHASE) {
/* For cleanup, reg #0 must be the exception and reg #1 zero */
_Unwind_SetGR(ctx, __builtin_eh_return_data_regno(0),
__builtin_extend_pointer(e));
(uintptr_t)e);
_Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1), 0);
_Unwind_SetIP(ctx, landingpad);
return _URC_INSTALL_CONTEXT;
}
abort();
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