binutils Newspaper
JUNE 15, 2026
aarch64 Proposed

aarch64: Add qualifier checks to aarch64-gen

Adds checks to aarch64-gen.c to verify correct lengths of qualifier sequences.

This patch adds checks to aarch64-gen.c to ensure that the qualifier sequences for AArch64 instructions have the correct length. These checks verify that each qualifier sequence corresponds to the number of operands in the instruction, preventing potential errors during assembly and disassembly. This improves the robustness of the AArch64 assembler and disassembler.

In the Thread 1 participant
  1. Alice Carlotti <alice.carlotti@arm.com> proposer

    Proposes adding checks to verify that all qualifier sequences have the correct length in aarch64-gen.c.

    “Add checks to verify that all qualifier sequences have the correct length.”

In Details

aarch64-gen.c is responsible for generating the AArch64 opcode tables used by the assembler and disassembler. Qualifiers are used to differentiate between different forms of an instruction based on operand types or other characteristics. Incorrectly sized qualifier sequences can lead to misassembly or incorrect disassembly.

For Context

This patch adds validation checks to the code that generates AArch64 instruction definitions within binutils. AArch64 instructions can have different forms depending on the types of operands they use. These forms are distinguished by "qualifiers." This patch ensures that the information describing these qualifiers is consistent with the instruction's operands, which helps prevent errors during the assembly and disassembly processes.

Filed Under: aarch64assemblerdisassemblerqualifiersvalidation