928 	uint64_t        prevFP;         // can't use a real pointer here until we're a 64 bit kernel  member
960 	uint64_t prevFP = 0ULL;  local
971 	uint32_t prevFP = 0U;  local
1021 		prevFP = 0;
1022 		kr = chudxnu_kern_read(&prevFP, (vm_offset_t)currFP, sizeof(currPC));
1025 		if (VALID_STACK_ADDRESS64(TRUE, prevFP, kernStackMin, kernStackMax)) {
1027 		if (VALID_STACK_ADDRESS(TRUE, prevFP, kernStackMin, kernStackMax)) {
1032 		if (prevFP <= currFP) {
1035 			currFP = prevFP;
1059 	uint64_t prevFP = 0ULL;  local
1102 		prevFP = 0;
1108 		prevFP = (uint64_t) tmpWord;    // promote 32 bit address
1110 		if (prevFP) {
1114 		if (prevFP < currFP) {
1117 			currFP = prevFP;
1138 	uint64_t prevFP = 0ULL;  local
1180 		prevFP = 0;
1182 			kr = chudxnu_kern_read(&prevFP, (vm_offset_t)currFP, sizeof(uint64_t));
1184 			kr = chudxnu_task_read(task, &prevFP, currFP, sizeof(uint64_t));
1187 		if (VALID_STACK_ADDRESS64(supervisor, prevFP, kernStackMin, kernStackMax)) {
1191 		if (prevFP < currFP) {
1194 			currFP = prevFP;