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--cpu=name

Affects the way machine code is disassembled by options such as -c or --disassemble, so that it is disassembled in the same way that the specified processor interprets it.

Syntax

--cpu=name

Where name is the name of a processor or architecture:

Processor and architecture names are not case-sensitive.

Wildcard characters are not accepted.

The following table shows the supported architectures. For a complete list of the supported architecture and processor names, specify the --cpu=list option.

Table 3-2 Supported Arm® architectures

Architecture name	Description
`6-M`	Armv6 architecture microcontroller profile.
`6S-M`	Armv6 architecture microcontroller profile with OS extensions.
`7-A`	Armv7 architecture application profile.
`7-A.security`	Armv7‑A architecture profile with Security Extensions and includes the `SMC` instruction (formerly `SMI`).
`7-R`	Armv7 architecture real-time profile.
`7-M`	Armv7 architecture microcontroller profile.
`7E-M`	Armv7‑M architecture profile with DSP extension.
`8-A.32`	Armv8‑A architecture profile, AArch32 state.
`8-A.32.crypto`	Armv8‑A architecture profile, AArch32 state with cryptographic instructions.
`8-A.64`	Armv8‑A architecture profile, AArch64 state.
`8-A.64.crypto`	Armv8‑A architecture profile, AArch64 state with cryptographic instructions.
`8.1-A.32`	Armv8.1, for Armv8‑A architecture profile, AArch32 state.
`8.1-A.32.crypto`	Armv8.1, for Armv8‑A architecture profile, AArch32 state with cryptographic instructions.
`8.1-A.64`	Armv8.1, for Armv8‑A architecture profile, AArch64 state.
`8.1-A.64.crypto`	Armv8.1, for Armv8‑A architecture profile, AArch64 state with cryptographic instructions.
`8.2-A.32`	Armv8.2, for Armv8‑A architecture profile, AArch32 state.
`8.2-A.32.crypto`	Armv8.2, for Armv8‑A architecture profile, AArch32 state with cryptographic instructions.
`8.2-A.64`	Armv8.2, for Armv8‑A architecture profile, AArch64 state.
`8.2-A.64.crypto`	Armv8.2, for Armv8‑A architecture profile, AArch64 state with cryptographic instructions.
`8.3-A.32`	Armv8.3, for Armv8‑A architecture profile, AArch32 state.
`8.3-A.32.crypto`	Armv8.3, for Armv8‑A architecture profile, AArch32 state with cryptographic instructions.
`8.3-A.64`	Armv8.3, for Armv8‑A architecture profile, AArch64 state.
`8.3-A.64.crypto`	Armv8.3, for Armv8‑A architecture profile, AArch64 state with cryptographic instructions.
`8-R`	Armv8‑R architecture profile.
`8-M.Base`	Armv8‑M baseline architecture profile. Derived from the Armv6‑M architecture.
`8-M.Main`	Armv8‑M mainline architecture profile. Derived from the Armv7‑M architecture.
`8-M.Main.dsp`	Armv8‑M mainline architecture profile with DSP extension.

Note

The full list of supported architectures and processors depends on your license.

Usage

The following general points apply to processor and architecture options:

Processors

Selecting the processor selects the appropriate architecture, Floating-Point Unit (FPU), and memory organization.

Architectures

If you specify an architecture name for the --cpu option, machine code is disassembled by options such as -c or --disassemble for that architecture. If you specify --disassemble, then the disassembly can be assembled for any processor supporting that architecture.

For example, --cpu=7-A --disassemble produces disassembly that can be assembled for the Cortex®‑A7 processor.

FPU

Some specifications of --cpu imply an --fpu selection.

Note
Any explicit FPU, set with --fpu on the command line, overrides an implicit FPU.
If no --fpu option is specified and no --cpu option is specified, --fpu=softvfp is used.

Default

If you do not specify a --cpu option, then fromelf disassembles machine instructions in an architecture-independent way. This means that fromelf disassembles anything that it recognizes as an instruction by some architecture.