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| author | Quentin Monnet <quentin.monnet@netronome.com> | 2017-10-23 19:24:10 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-24 03:25:08 +0300 |
| commit | f05e2c32f715985f54265b1e237b5cce1b576c71 (patch) | |
| tree | e2038a3c68b105bf6e58bb58d6c3d995a0bafe70 /tools/bpf/bpftool/common.c | |
| parent | 107f041212c1dfd3bf72b01c0d2013e98b6f32c2 (diff) | |
| download | linux-f05e2c32f715985f54265b1e237b5cce1b576c71.tar.xz | |
tools: bpftool: add JSON output for `bpftool prog dump xlated *` command
Add a new printing function to dump translated eBPF instructions as
JSON. As for plain output, opcodes are printed only on request (when
`opcodes` is provided on the command line).
The disassembled output is generated by the same code that is used by
the kernel verifier.
Example output:
$ bpftool --json --pretty prog dump xlated id 1
[{
"disasm": "(bf) r6 = r1"
},{
"disasm": "(61) r7 = *(u32 *)(r6 +16)"
},{
"disasm": "(95) exit"
}
]
$ bpftool --json --pretty prog dump xlated id 1 opcodes
[{
"disasm": "(bf) r6 = r1",
"opcodes": {
"code": "0xbf",
"src_reg": "0x1",
"dst_reg": "0x6",
"off": ["0x00","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
},{
"disasm": "(61) r7 = *(u32 *)(r6 +16)",
"opcodes": {
"code": "0x61",
"src_reg": "0x6",
"dst_reg": "0x7",
"off": ["0x10","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
},{
"disasm": "(95) exit",
"opcodes": {
"code": "0x95",
"src_reg": "0x0",
"dst_reg": "0x0",
"off": ["0x00","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
}
]
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/bpf/bpftool/common.c')
| -rw-r--r-- | tools/bpf/bpftool/common.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index df8396a0c400..e7a756b8ee21 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -214,3 +214,13 @@ char *get_fdinfo(int fd, const char *key) fclose(fdi); return NULL; } + +void print_hex_data_json(uint8_t *data, size_t len) +{ + unsigned int i; + + jsonw_start_array(json_wtr); + for (i = 0; i < len; i++) + jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); + jsonw_end_array(json_wtr); +} |