noreturn

incomplete_block(Block:address)

This module performs an early noreturn analysis after code inference but before use-def analysis begins. It is intended to eliminate CFG edges that may otherwise produce spurious def_used instances.

Uses: arch.return, indirect_jump, pc_relative_jump, reg_jump

Recursive: cmp_defines, first_block_in_byte_interval, overlapping_instruction, split_load_for_symbolization, relocation_adjustment, call_tls_get_addr, simple_data_access_pattern, reg_def_use.def_used, base_relative_operand, split_load_total_points, block, litpool_confidence, reg_has_got, value_reg_limit, stack_def_use.live_var_used, split_load_point, split_load_operand, flags_and_jump_pair, wis_schedule_iter, unresolved_interval, code_in_block, compare_and_jump_indirect_op_valid, __agg_subclause3, inferred_main_in_reg, reg_used_for, is_padding, resolved_reaches, compare_and_jump_indirect, __agg_subclause2, padding_block_candidate, reg_reg_arithmetic_operation_defs, def_used_for_address, impossible_block, plt_block, arm_jump_table_block_instruction, composite_data_access, possible_target_from, jump_table_candidate_refined, base_relative_operation, split_load, __agg_single3, reg_has_base_image, no_value_reg_limit, relative_address_start, wis_schedule, plt_entry, reg_def_use.used_in_block, adjusts_stack_in_block, possible_target, initialized_data_segment, reg_def_use.live_var_at_block_end, cmp_reg_to_reg, indefinite_litpool_ref, negative_block_heuristic, contains_implausible_instr_seq, indexed_pc_relative_load, next_block_in_byte_interval, code_in_block_candidate, symbolic_expr_from_relocation, unlikely_have_symbolic_immediate, incomplete_block, arm_jump_table_data_block_limit, inferred_main_dispatch, arch.simple_data_load, data_block_limit, block_total_points, invalid_jump_table_candidate, stack_def_use.live_var_def, reg_def_use.live_var_def, arm_jump_table_block_start, block_overlap, stack_base_reg_move, may_fallthrough, __agg_single2, block_heuristic, __agg_subclause9, block_implies_block, segment_target_range, stack_def_use.live_var_at_prior_used, cinf_ldr_add_pc, no_return_call_propagated, unresolved_block_overlap, jump_table_max, common_tail, unresolved_interval_order, tls_get_addr, block_points_proportional, likely_fallthrough, block_boundaries, jump_table_element_access, block_points, invalid, jump_table_target, reg_def_use.used, arm_jump_table_candidate, reg_def_use.live_var_at_prior_used, no_return_call, arm_jump_table_skip_first_entry, stack_def_use.defined_in_block, split_load_conflict, arm_jump_table_candidate_start, stack_def_use.live_var_at_block_end, reg_def_use.last_def_in_block, arm_jump_table_cmp_limit, data_in_code, candidate_block_is_not_padding, inter_procedural_edge, known_block, instruction_memory_access_size, overlap_with_litpool, block_limit, function_inference.function_entry_initial, init_symbol_minus_symbol_candidate_arm, const_value_reg_used, self_contained_segment, stack_def_use.last_def_in_block, must_fallthrough, straight_line_last_def, padding_block_limit, jump_table_candidate, no_return_call_refined, block_candidate_dependency_edge, split_load_candidate, stack_def_use.block_last_def, last_value_reg_limit, relative_address, no_return_block, litpool_ref, symbol_minus_symbol_litpool_access_pattern, block_last_instruction, gp_relative_operand, data_in_code_propagate, block_candidate_boundaries, basic_target, compare_and_jump_immediate, wis_memo, __agg_subclause6, nop_in_padding_candidate, reg_def_use.defined_in_block, __agg_single6, relocation_adjustment_total, candidate_block_is_padding, wis_prior, reg_def_use.live_var_used, __agg_subclause7, wis_has_prior, compare_and_jump_register, block_instruction_next, arm_jump_table_data_block, value_reg, contains_plausible_instr_seq, relative_jump_table_entry_candidate, adrp_used, stack_def_use.def_used, got_relative_operand, __agg_subclause10, value_reg_edge, arch.reg_relative_load, reg_def_use.flow_def, hi_load_prop, jump_table_start, branch_to_calculated_pc_rel_addr, tls_desc_call, discarded_block, stack_def_use.live_var_used_in_block, data_segment, value_reg_unsupported, block_next, discarded_split_load, indexed_pc_relative_load_relative, litpool_symbolic_operand, data_block_candidate, reg_def_use.return_block_end, code_in_block_candidate_refined, after_end, jump_table_signed, reg_def_use.block_last_def, base_relative_jump, unresolved_interval_best_block, straight_line_def_used, unresolved_block, data_access, correlated_live_reg, jump_table_prelude, litpool_boundaries, init_ldr_add_pc, arch.extend_load, stack_def_use.used_in_block, stack_def_use.ref_in_block, reg_def_use.ref_in_block, reg_def_use.return_val_used

direct_or_pcrel_jump(Src:address, Dest:address)

segment_target_range(Beg:address, End:address, Tmax:address)

The segment between [Beg,End] does not have any indirect targets or return instructions and all the direct targets are between Beg and Tmax

If End > Tmax, then we can say that the segment is self-contained, which means that the only way to step out of it is through a fallthrough in the last block

Uses: direct_jump, direct_or_pcrel_jump

Recursive: cmp_defines, first_block_in_byte_interval, overlapping_instruction, split_load_for_symbolization, relocation_adjustment, call_tls_get_addr, simple_data_access_pattern, reg_def_use.def_used, base_relative_operand, split_load_total_points, block, litpool_confidence, reg_has_got, value_reg_limit, stack_def_use.live_var_used, split_load_point, split_load_operand, flags_and_jump_pair, wis_schedule_iter, unresolved_interval, code_in_block, compare_and_jump_indirect_op_valid, __agg_subclause3, inferred_main_in_reg, reg_used_for, is_padding, resolved_reaches, compare_and_jump_indirect, __agg_subclause2, padding_block_candidate, reg_reg_arithmetic_operation_defs, def_used_for_address, impossible_block, plt_block, arm_jump_table_block_instruction, composite_data_access, possible_target_from, jump_table_candidate_refined, base_relative_operation, split_load, __agg_single3, reg_has_base_image, no_value_reg_limit, relative_address_start, wis_schedule, plt_entry, reg_def_use.used_in_block, adjusts_stack_in_block, possible_target, initialized_data_segment, reg_def_use.live_var_at_block_end, cmp_reg_to_reg, indefinite_litpool_ref, negative_block_heuristic, contains_implausible_instr_seq, indexed_pc_relative_load, next_block_in_byte_interval, code_in_block_candidate, symbolic_expr_from_relocation, unlikely_have_symbolic_immediate, incomplete_block, arm_jump_table_data_block_limit, inferred_main_dispatch, arch.simple_data_load, data_block_limit, block_total_points, invalid_jump_table_candidate, stack_def_use.live_var_def, reg_def_use.live_var_def, arm_jump_table_block_start, block_overlap, stack_base_reg_move, may_fallthrough, __agg_single2, block_heuristic, __agg_subclause9, block_implies_block, segment_target_range, stack_def_use.live_var_at_prior_used, cinf_ldr_add_pc, no_return_call_propagated, unresolved_block_overlap, jump_table_max, common_tail, unresolved_interval_order, tls_get_addr, block_points_proportional, likely_fallthrough, block_boundaries, jump_table_element_access, block_points, invalid, jump_table_target, reg_def_use.used, arm_jump_table_candidate, reg_def_use.live_var_at_prior_used, no_return_call, arm_jump_table_skip_first_entry, stack_def_use.defined_in_block, split_load_conflict, arm_jump_table_candidate_start, stack_def_use.live_var_at_block_end, reg_def_use.last_def_in_block, arm_jump_table_cmp_limit, data_in_code, candidate_block_is_not_padding, inter_procedural_edge, known_block, instruction_memory_access_size, overlap_with_litpool, block_limit, function_inference.function_entry_initial, init_symbol_minus_symbol_candidate_arm, const_value_reg_used, self_contained_segment, stack_def_use.last_def_in_block, must_fallthrough, straight_line_last_def, padding_block_limit, jump_table_candidate, no_return_call_refined, block_candidate_dependency_edge, split_load_candidate, stack_def_use.block_last_def, last_value_reg_limit, relative_address, no_return_block, litpool_ref, symbol_minus_symbol_litpool_access_pattern, block_last_instruction, gp_relative_operand, data_in_code_propagate, block_candidate_boundaries, basic_target, compare_and_jump_immediate, wis_memo, __agg_subclause6, nop_in_padding_candidate, reg_def_use.defined_in_block, __agg_single6, relocation_adjustment_total, candidate_block_is_padding, wis_prior, reg_def_use.live_var_used, __agg_subclause7, wis_has_prior, compare_and_jump_register, block_instruction_next, arm_jump_table_data_block, value_reg, contains_plausible_instr_seq, relative_jump_table_entry_candidate, adrp_used, stack_def_use.def_used, got_relative_operand, __agg_subclause10, value_reg_edge, arch.reg_relative_load, reg_def_use.flow_def, hi_load_prop, jump_table_start, branch_to_calculated_pc_rel_addr, tls_desc_call, discarded_block, stack_def_use.live_var_used_in_block, data_segment, value_reg_unsupported, block_next, discarded_split_load, indexed_pc_relative_load_relative, litpool_symbolic_operand, data_block_candidate, reg_def_use.return_block_end, code_in_block_candidate_refined, after_end, jump_table_signed, reg_def_use.block_last_def, base_relative_jump, unresolved_interval_best_block, straight_line_def_used, unresolved_block, data_access, correlated_live_reg, jump_table_prelude, litpool_boundaries, init_ldr_add_pc, arch.extend_load, stack_def_use.used_in_block, stack_def_use.ref_in_block, reg_def_use.ref_in_block, reg_def_use.return_val_used

self_contained_segment(Beg:address, End:address)

no_return_block(EA:address)

No-return blocks.

This is a underapproximation, since it cannot propagate through jumptables or indirect calls (which are not yet resolved), or could call library functions that are not known to be no-return.

The only situation where it would generate false-positive noreturns is if a “known noreturn” library function does, in fact, return.

Uses: direct_call

Recursive: cmp_defines, first_block_in_byte_interval, overlapping_instruction, split_load_for_symbolization, relocation_adjustment, call_tls_get_addr, simple_data_access_pattern, reg_def_use.def_used, base_relative_operand, split_load_total_points, block, litpool_confidence, reg_has_got, value_reg_limit, stack_def_use.live_var_used, split_load_point, split_load_operand, flags_and_jump_pair, wis_schedule_iter, unresolved_interval, code_in_block, compare_and_jump_indirect_op_valid, __agg_subclause3, inferred_main_in_reg, reg_used_for, is_padding, resolved_reaches, compare_and_jump_indirect, __agg_subclause2, padding_block_candidate, reg_reg_arithmetic_operation_defs, def_used_for_address, impossible_block, plt_block, arm_jump_table_block_instruction, composite_data_access, possible_target_from, jump_table_candidate_refined, base_relative_operation, split_load, __agg_single3, reg_has_base_image, no_value_reg_limit, relative_address_start, wis_schedule, plt_entry, reg_def_use.used_in_block, adjusts_stack_in_block, possible_target, initialized_data_segment, reg_def_use.live_var_at_block_end, cmp_reg_to_reg, indefinite_litpool_ref, negative_block_heuristic, contains_implausible_instr_seq, indexed_pc_relative_load, next_block_in_byte_interval, code_in_block_candidate, symbolic_expr_from_relocation, unlikely_have_symbolic_immediate, incomplete_block, arm_jump_table_data_block_limit, inferred_main_dispatch, arch.simple_data_load, data_block_limit, block_total_points, invalid_jump_table_candidate, stack_def_use.live_var_def, reg_def_use.live_var_def, arm_jump_table_block_start, block_overlap, stack_base_reg_move, may_fallthrough, __agg_single2, block_heuristic, __agg_subclause9, block_implies_block, segment_target_range, stack_def_use.live_var_at_prior_used, cinf_ldr_add_pc, no_return_call_propagated, unresolved_block_overlap, jump_table_max, common_tail, unresolved_interval_order, tls_get_addr, block_points_proportional, likely_fallthrough, block_boundaries, jump_table_element_access, block_points, invalid, jump_table_target, reg_def_use.used, arm_jump_table_candidate, reg_def_use.live_var_at_prior_used, no_return_call, arm_jump_table_skip_first_entry, stack_def_use.defined_in_block, split_load_conflict, arm_jump_table_candidate_start, stack_def_use.live_var_at_block_end, reg_def_use.last_def_in_block, arm_jump_table_cmp_limit, data_in_code, candidate_block_is_not_padding, inter_procedural_edge, known_block, instruction_memory_access_size, overlap_with_litpool, block_limit, function_inference.function_entry_initial, init_symbol_minus_symbol_candidate_arm, const_value_reg_used, self_contained_segment, stack_def_use.last_def_in_block, must_fallthrough, straight_line_last_def, padding_block_limit, jump_table_candidate, no_return_call_refined, block_candidate_dependency_edge, split_load_candidate, stack_def_use.block_last_def, last_value_reg_limit, relative_address, no_return_block, litpool_ref, symbol_minus_symbol_litpool_access_pattern, block_last_instruction, gp_relative_operand, data_in_code_propagate, block_candidate_boundaries, basic_target, compare_and_jump_immediate, wis_memo, __agg_subclause6, nop_in_padding_candidate, reg_def_use.defined_in_block, __agg_single6, relocation_adjustment_total, candidate_block_is_padding, wis_prior, reg_def_use.live_var_used, __agg_subclause7, wis_has_prior, compare_and_jump_register, block_instruction_next, arm_jump_table_data_block, value_reg, contains_plausible_instr_seq, relative_jump_table_entry_candidate, adrp_used, stack_def_use.def_used, got_relative_operand, __agg_subclause10, value_reg_edge, arch.reg_relative_load, reg_def_use.flow_def, hi_load_prop, jump_table_start, branch_to_calculated_pc_rel_addr, tls_desc_call, discarded_block, stack_def_use.live_var_used_in_block, data_segment, value_reg_unsupported, block_next, discarded_split_load, indexed_pc_relative_load_relative, litpool_symbolic_operand, data_block_candidate, reg_def_use.return_block_end, code_in_block_candidate_refined, after_end, jump_table_signed, reg_def_use.block_last_def, base_relative_jump, unresolved_interval_best_block, straight_line_def_used, unresolved_block, data_access, correlated_live_reg, jump_table_prelude, litpool_boundaries, init_ldr_add_pc, arch.extend_load, stack_def_use.used_in_block, stack_def_use.ref_in_block, reg_def_use.ref_in_block, reg_def_use.return_val_used

no_return_call_refined(EA:address)

Calls to known no return functions or their PLT blocks.

Uses: direct_call, no_return_function

Recursive: cmp_defines, first_block_in_byte_interval, overlapping_instruction, split_load_for_symbolization, relocation_adjustment, call_tls_get_addr, simple_data_access_pattern, reg_def_use.def_used, base_relative_operand, split_load_total_points, block, litpool_confidence, reg_has_got, value_reg_limit, stack_def_use.live_var_used, split_load_point, split_load_operand, flags_and_jump_pair, wis_schedule_iter, unresolved_interval, code_in_block, compare_and_jump_indirect_op_valid, __agg_subclause3, inferred_main_in_reg, reg_used_for, is_padding, resolved_reaches, compare_and_jump_indirect, __agg_subclause2, padding_block_candidate, reg_reg_arithmetic_operation_defs, def_used_for_address, impossible_block, plt_block, arm_jump_table_block_instruction, composite_data_access, possible_target_from, jump_table_candidate_refined, base_relative_operation, split_load, __agg_single3, reg_has_base_image, no_value_reg_limit, relative_address_start, wis_schedule, plt_entry, reg_def_use.used_in_block, adjusts_stack_in_block, possible_target, initialized_data_segment, reg_def_use.live_var_at_block_end, cmp_reg_to_reg, indefinite_litpool_ref, negative_block_heuristic, contains_implausible_instr_seq, indexed_pc_relative_load, next_block_in_byte_interval, code_in_block_candidate, symbolic_expr_from_relocation, unlikely_have_symbolic_immediate, incomplete_block, arm_jump_table_data_block_limit, inferred_main_dispatch, arch.simple_data_load, data_block_limit, block_total_points, invalid_jump_table_candidate, stack_def_use.live_var_def, reg_def_use.live_var_def, arm_jump_table_block_start, block_overlap, stack_base_reg_move, may_fallthrough, __agg_single2, block_heuristic, __agg_subclause9, block_implies_block, segment_target_range, stack_def_use.live_var_at_prior_used, cinf_ldr_add_pc, no_return_call_propagated, unresolved_block_overlap, jump_table_max, common_tail, unresolved_interval_order, tls_get_addr, block_points_proportional, likely_fallthrough, block_boundaries, jump_table_element_access, block_points, invalid, jump_table_target, reg_def_use.used, arm_jump_table_candidate, reg_def_use.live_var_at_prior_used, no_return_call, arm_jump_table_skip_first_entry, stack_def_use.defined_in_block, split_load_conflict, arm_jump_table_candidate_start, stack_def_use.live_var_at_block_end, reg_def_use.last_def_in_block, arm_jump_table_cmp_limit, data_in_code, candidate_block_is_not_padding, inter_procedural_edge, known_block, instruction_memory_access_size, overlap_with_litpool, block_limit, function_inference.function_entry_initial, init_symbol_minus_symbol_candidate_arm, const_value_reg_used, self_contained_segment, stack_def_use.last_def_in_block, must_fallthrough, straight_line_last_def, padding_block_limit, jump_table_candidate, no_return_call_refined, block_candidate_dependency_edge, split_load_candidate, stack_def_use.block_last_def, last_value_reg_limit, relative_address, no_return_block, litpool_ref, symbol_minus_symbol_litpool_access_pattern, block_last_instruction, gp_relative_operand, data_in_code_propagate, block_candidate_boundaries, basic_target, compare_and_jump_immediate, wis_memo, __agg_subclause6, nop_in_padding_candidate, reg_def_use.defined_in_block, __agg_single6, relocation_adjustment_total, candidate_block_is_padding, wis_prior, reg_def_use.live_var_used, __agg_subclause7, wis_has_prior, compare_and_jump_register, block_instruction_next, arm_jump_table_data_block, value_reg, contains_plausible_instr_seq, relative_jump_table_entry_candidate, adrp_used, stack_def_use.def_used, got_relative_operand, __agg_subclause10, value_reg_edge, arch.reg_relative_load, reg_def_use.flow_def, hi_load_prop, jump_table_start, branch_to_calculated_pc_rel_addr, tls_desc_call, discarded_block, stack_def_use.live_var_used_in_block, data_segment, value_reg_unsupported, block_next, discarded_split_load, indexed_pc_relative_load_relative, litpool_symbolic_operand, data_block_candidate, reg_def_use.return_block_end, code_in_block_candidate_refined, after_end, jump_table_signed, reg_def_use.block_last_def, base_relative_jump, unresolved_interval_best_block, straight_line_def_used, unresolved_block, data_access, correlated_live_reg, jump_table_prelude, litpool_boundaries, init_ldr_add_pc, arch.extend_load, stack_def_use.used_in_block, stack_def_use.ref_in_block, reg_def_use.ref_in_block, reg_def_use.return_val_used

no_return_call_propagated(EA:address)

Calls to noreturn blocks.

Uses: direct_call, pc_load_call

Used by: cfg_edge

Recursive: cmp_defines, first_block_in_byte_interval, overlapping_instruction, split_load_for_symbolization, relocation_adjustment, call_tls_get_addr, simple_data_access_pattern, reg_def_use.def_used, base_relative_operand, split_load_total_points, block, litpool_confidence, reg_has_got, value_reg_limit, stack_def_use.live_var_used, split_load_point, split_load_operand, flags_and_jump_pair, wis_schedule_iter, unresolved_interval, code_in_block, compare_and_jump_indirect_op_valid, __agg_subclause3, inferred_main_in_reg, reg_used_for, is_padding, resolved_reaches, compare_and_jump_indirect, __agg_subclause2, padding_block_candidate, reg_reg_arithmetic_operation_defs, def_used_for_address, impossible_block, plt_block, arm_jump_table_block_instruction, composite_data_access, possible_target_from, jump_table_candidate_refined, base_relative_operation, split_load, __agg_single3, reg_has_base_image, no_value_reg_limit, relative_address_start, wis_schedule, plt_entry, reg_def_use.used_in_block, adjusts_stack_in_block, possible_target, initialized_data_segment, reg_def_use.live_var_at_block_end, cmp_reg_to_reg, indefinite_litpool_ref, negative_block_heuristic, contains_implausible_instr_seq, indexed_pc_relative_load, next_block_in_byte_interval, code_in_block_candidate, symbolic_expr_from_relocation, unlikely_have_symbolic_immediate, incomplete_block, arm_jump_table_data_block_limit, inferred_main_dispatch, arch.simple_data_load, data_block_limit, block_total_points, invalid_jump_table_candidate, stack_def_use.live_var_def, reg_def_use.live_var_def, arm_jump_table_block_start, block_overlap, stack_base_reg_move, may_fallthrough, __agg_single2, block_heuristic, __agg_subclause9, block_implies_block, segment_target_range, stack_def_use.live_var_at_prior_used, cinf_ldr_add_pc, no_return_call_propagated, unresolved_block_overlap, jump_table_max, common_tail, unresolved_interval_order, tls_get_addr, block_points_proportional, likely_fallthrough, block_boundaries, jump_table_element_access, block_points, invalid, jump_table_target, reg_def_use.used, arm_jump_table_candidate, reg_def_use.live_var_at_prior_used, no_return_call, arm_jump_table_skip_first_entry, stack_def_use.defined_in_block, split_load_conflict, arm_jump_table_candidate_start, stack_def_use.live_var_at_block_end, reg_def_use.last_def_in_block, arm_jump_table_cmp_limit, data_in_code, candidate_block_is_not_padding, inter_procedural_edge, known_block, instruction_memory_access_size, overlap_with_litpool, block_limit, function_inference.function_entry_initial, init_symbol_minus_symbol_candidate_arm, const_value_reg_used, self_contained_segment, stack_def_use.last_def_in_block, must_fallthrough, straight_line_last_def, padding_block_limit, jump_table_candidate, no_return_call_refined, block_candidate_dependency_edge, split_load_candidate, stack_def_use.block_last_def, last_value_reg_limit, relative_address, no_return_block, litpool_ref, symbol_minus_symbol_litpool_access_pattern, block_last_instruction, gp_relative_operand, data_in_code_propagate, block_candidate_boundaries, basic_target, compare_and_jump_immediate, wis_memo, __agg_subclause6, nop_in_padding_candidate, reg_def_use.defined_in_block, __agg_single6, relocation_adjustment_total, candidate_block_is_padding, wis_prior, reg_def_use.live_var_used, __agg_subclause7, wis_has_prior, compare_and_jump_register, block_instruction_next, arm_jump_table_data_block, value_reg, contains_plausible_instr_seq, relative_jump_table_entry_candidate, adrp_used, stack_def_use.def_used, got_relative_operand, __agg_subclause10, value_reg_edge, arch.reg_relative_load, reg_def_use.flow_def, hi_load_prop, jump_table_start, branch_to_calculated_pc_rel_addr, tls_desc_call, discarded_block, stack_def_use.live_var_used_in_block, data_segment, value_reg_unsupported, block_next, discarded_split_load, indexed_pc_relative_load_relative, litpool_symbolic_operand, data_block_candidate, reg_def_use.return_block_end, code_in_block_candidate_refined, after_end, jump_table_signed, reg_def_use.block_last_def, base_relative_jump, unresolved_interval_best_block, straight_line_def_used, unresolved_block, data_access, correlated_live_reg, jump_table_prelude, litpool_boundaries, init_ldr_add_pc, arch.extend_load, stack_def_use.used_in_block, stack_def_use.ref_in_block, reg_def_use.ref_in_block, reg_def_use.return_val_used