cli: Add support for symbolizing kernel addresses

Add support for symbolization of kernel addresses to the program. Right
now we do not expose any additional options and just rely on the
"default" kernel symbolization source.

  $ cargo run -p blazecli -- symbolize kernel 0x0000000000019008 0xffffffffc005e378
  > 0x00000000019008: espfix_stack @ 0x19008+0x0
  > 0xffffffffc005e378: bpf_prog_6deef7357e7b4530_sd_fw_ingress @ 0xffffffffc005e2dc+0x9c

Signed-off-by: Daniel Müller <deso@posteo.net>

cli/CHANGELOG.md

@@ -1,3 +1,8 @@
+Unreleased
+----------
+- Added support for symbolization of kernel addresses
+
+
 0.1.6
 -----
 - Added `--procmap-query` option to `normalize user` sub-command

cli/src/args.rs

@@ -175,6 +175,7 @@ pub mod symbolize {
         Elf(Elf),
         Gsym(Gsym),
         Process(Process),
+        Kernel(Kernel),
     }
 
     #[derive(Debug, Arguments)]
@@ -246,4 +247,11 @@ pub mod symbolize {
         #[clap(long)]
         pub no_map_files: bool,
     }
+
+    #[derive(Debug, Arguments)]
+    pub struct Kernel {
+        /// The addresses to symbolize.
+        #[arg(value_parser = parse_addr)]
+        pub addrs: Vec<Addr>,
+    }
 }

cli/src/main.rs

@@ -255,6 +255,13 @@ fn symbolize(symbolize: args::symbolize::Symbolize) -> Result<()> {
             let input = symbolize::Input::AbsAddr(addrs);
             (src, input, addrs)
         }
+        args::symbolize::Symbolize::Kernel(args::symbolize::Kernel { ref addrs }) => {
+            let kernel = symbolize::Kernel::default();
+            let src = symbolize::Source::from(kernel);
+            let addrs = addrs.as_slice();
+            let input = symbolize::Input::AbsAddr(addrs);
+            (src, input, addrs)
+        }
     };
 
     let symbolizer = builder.build();