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3.21.14 eBPF Options ¶

-mframe-limit=bytes ¶

This specifies the hard limit for frame sizes, in bytes. Currently,the value that can be specified should be less than or equal to‘32767’. Defaults to whatever limit is imposed by the version ofthe Linux kernel targeted.

-mbig-endian ¶

Generate code for a big-endian target.

-mlittle-endian ¶

Generate code for a little-endian target. This is the default.

-mjmpext ¶

-mno-jmpext

Enable or disable generation of extra conditional-branch instructions.Enabled for CPU v2 and above.

-mjmp32 ¶

-mno-jmp32

Enable or disable generation of 32-bit jump instructions.Enabled for CPU v3 and above.

-malu32 ¶

-mno-alu32

Enable or disable generation of 32-bit ALU instructions.Enabled for CPU v3 and above.

-mv3-atomics ¶

-mno-v3-atomics

Enable or disable instructions for general atomic operations introducedin CPU v3. Enabled for CPU v3 and above.

-mbswap ¶

-mno-bswap

Enable or disable byte swap instructions. Enabled for CPU v4 and above.

-msdiv ¶

-mno-sdiv

Enable or disable signed division and modulus instructions. Enabled forCPU v4 and above.

-msmov ¶

-mno-smov

Enable or disable sign-extending move and memory load instructions.Enabled for CPU v4 and above.

-mcpu=version ¶

This specifies which version of the eBPF ISA to target. Newer versionsmay not be supported by all kernels. The default is ‘v4’.

Supported values forversion are:

‘v1’

The first stable eBPF ISA with no special features or extensions.

‘v2’

Supports the jump extensions, as in-mjmpext.

‘v3’

All features of v2, plus:

32-bit jump operations, as in-mjmp32
32-bit ALU operations, as in-malu32
general atomic operations, as in-mv3-atomics

‘v4’

All features of v3, plus:

Byte swap instructions, as in-mbswap
Signed division and modulus instructions, as in-msdiv
Sign-extending move and memory load instructions, as in-msmov

-mco-re ¶

-mno-co-re

Enable or disable BPF Compile Once - Run Everywhere (CO-RE) support.BPF CO-RE support is enabled by default when generating BTF debuginformation for the BPF target (-gbtf).

-mxbpf ¶

Generate code for an expanded version of BPF, which relaxes some ofthe restrictions imposed by the BPF architecture:

Save and restore callee-saved registers at function entry andexit, respectively.

-masm=dialect ¶

Outputs assembly instructions using eBPF selecteddialect. The defaultis ‘pseudoc’.

Supported values fordialect are:

‘normal’: Outputs normal assembly dialect.
‘pseudoc’: Outputs pseudo-c assembly dialect.

-minline-memops-threshold=bytes ¶

Specifies a size threshold in bytes at or below which memmove, memcpyand memset shall always be expanded inline. Operations dealing withsizes larger than this threshold would have to be implemented usinga library call instead of being expanded inline, but since BPF doesn’tallow libcalls, exceeding this threshold results in a compile-timeerror. The default is ‘1024’ bytes.