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Diffstat (limited to 'tools/bpf/bpftool/Documentation/bpftool-btf.rst')
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diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst index 342716f74e..eaba24320f 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-btf.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-btf.rst @@ -14,82 +14,76 @@ tool for inspection of BTF data SYNOPSIS ======== - **bpftool** [*OPTIONS*] **btf** *COMMAND* +**bpftool** [*OPTIONS*] **btf** *COMMAND* - *OPTIONS* := { |COMMON_OPTIONS| | { **-B** | **--base-btf** } } +*OPTIONS* := { |COMMON_OPTIONS| | { **-B** | **--base-btf** } } - *COMMANDS* := { **dump** | **help** } +*COMMANDS* := { **dump** | **help** } BTF COMMANDS ============= -| **bpftool** **btf** { **show** | **list** } [**id** *BTF_ID*] -| **bpftool** **btf dump** *BTF_SRC* [**format** *FORMAT*] -| **bpftool** **btf help** +| **bpftool** **btf** { **show** | **list** } [**id** *BTF_ID*] +| **bpftool** **btf dump** *BTF_SRC* [**format** *FORMAT*] +| **bpftool** **btf help** | -| *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* } -| *FORMAT* := { **raw** | **c** } -| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* } -| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* } +| *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* } +| *FORMAT* := { **raw** | **c** } +| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* } +| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* } DESCRIPTION =========== - **bpftool btf { show | list }** [**id** *BTF_ID*] - Show information about loaded BTF objects. If a BTF ID is - specified, show information only about given BTF object, - otherwise list all BTF objects currently loaded on the - system. +bpftool btf { show | list } [id *BTF_ID*] + Show information about loaded BTF objects. If a BTF ID is specified, show + information only about given BTF object, otherwise list all BTF objects + currently loaded on the system. - Since Linux 5.8 bpftool is able to discover information about - processes that hold open file descriptors (FDs) against BTF - objects. On such kernels bpftool will automatically emit this - information as well. + Since Linux 5.8 bpftool is able to discover information about processes + that hold open file descriptors (FDs) against BTF objects. On such kernels + bpftool will automatically emit this information as well. - **bpftool btf dump** *BTF_SRC* - Dump BTF entries from a given *BTF_SRC*. +bpftool btf dump *BTF_SRC* + Dump BTF entries from a given *BTF_SRC*. - When **id** is specified, BTF object with that ID will be - loaded and all its BTF types emitted. + When **id** is specified, BTF object with that ID will be loaded and all + its BTF types emitted. - When **map** is provided, it's expected that map has - associated BTF object with BTF types describing key and - value. It's possible to select whether to dump only BTF - type(s) associated with key (**key**), value (**value**), - both key and value (**kv**), or all BTF types present in - associated BTF object (**all**). If not specified, **kv** - is assumed. + When **map** is provided, it's expected that map has associated BTF object + with BTF types describing key and value. It's possible to select whether to + dump only BTF type(s) associated with key (**key**), value (**value**), + both key and value (**kv**), or all BTF types present in associated BTF + object (**all**). If not specified, **kv** is assumed. - When **prog** is provided, it's expected that program has - associated BTF object with BTF types. + When **prog** is provided, it's expected that program has associated BTF + object with BTF types. - When specifying *FILE*, an ELF file is expected, containing - .BTF section with well-defined BTF binary format data, - typically produced by clang or pahole. + When specifying *FILE*, an ELF file is expected, containing .BTF section + with well-defined BTF binary format data, typically produced by clang or + pahole. - **format** option can be used to override default (raw) - output format. Raw (**raw**) or C-syntax (**c**) output - formats are supported. + **format** option can be used to override default (raw) output format. Raw + (**raw**) or C-syntax (**c**) output formats are supported. - **bpftool btf help** - Print short help message. +bpftool btf help + Print short help message. OPTIONS ======= - .. include:: common_options.rst - - -B, --base-btf *FILE* - Pass a base BTF object. Base BTF objects are typically used - with BTF objects for kernel modules. To avoid duplicating - all kernel symbols required by modules, BTF objects for - modules are "split", they are built incrementally on top of - the kernel (vmlinux) BTF object. So the base BTF reference - should usually point to the kernel BTF. - - When the main BTF object to process (for example, the - module BTF to dump) is passed as a *FILE*, bpftool attempts - to autodetect the path for the base object, and passing - this option is optional. When the main BTF object is passed - through other handles, this option becomes necessary. +.. include:: common_options.rst + +-B, --base-btf *FILE* + Pass a base BTF object. Base BTF objects are typically used with BTF + objects for kernel modules. To avoid duplicating all kernel symbols + required by modules, BTF objects for modules are "split", they are + built incrementally on top of the kernel (vmlinux) BTF object. So the + base BTF reference should usually point to the kernel BTF. + + When the main BTF object to process (for example, the module BTF to + dump) is passed as a *FILE*, bpftool attempts to autodetect the path + for the base object, and passing this option is optional. When the main + BTF object is passed through other handles, this option becomes + necessary. EXAMPLES ======== |