x86/tools: Add decoded instruction dump mode

Add instruction dump mode to insn_sanity tool for
checking decoder really decoded instructions.

This mode is enabled when passing double -v (-vv) to
insn_sanity. It is useful for who wants to check whether
the decoder can decode some instructions correctly.
e.g.
 $ echo 0f 73 10 11 | ./insn_sanity -y -vv -i -
 Instruction = {
        .prefixes = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 1, .nbytes = 0},
        .rex_prefix = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 1, .nbytes = 0},
        .vex_prefix = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 1, .nbytes = 0},
        .opcode = {
                .value = 29455, bytes[] = {f, 73, 0, 0},
                .got = 1, .nbytes = 2},
        .modrm = {
                .value = 16, bytes[] = {10, 0, 0, 0},
                .got = 1, .nbytes = 1},
        .sib = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 1, .nbytes = 0},
        .displacement = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 1, .nbytes = 0},
        .immediate1 = {
                .value = 17, bytes[] = {11, 0, 0, 0},
                .got = 1, .nbytes = 1},
        .immediate2 = {
                .value = 0, bytes[] = {0, 0, 0, 0},
                .got = 0, .nbytes = 0},
        .attr = 44800, .opnd_bytes = 4, .addr_bytes = 8,
        .length = 4, .x86_64 = 1, .kaddr = 0x7fff0f7d9430}
 Success: decoded and checked 1 given instructions with 0 errors (seed:0x0)

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20111205120603.15475.91192.stgit@cloud
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/tools/insn_sanity.c b/arch/x86/tools/insn_sanity.c
index b6720d6..cc2f8c1 100644 (file)
--- a/arch/x86/tools/insn_sanity.c
+++ b/arch/x86/tools/insn_sanity.c
@@ -59,7 +59,7 @@ static void usage(const char *err)
        fprintf(stderr, "Usage: %s [-y|-n|-v] [-s seed[,no]] [-m max] [-i input]\n", prog);
        fprintf(stderr, "\t-y   64bit mode\n");
        fprintf(stderr, "\t-n   32bit mode\n");
-       fprintf(stderr, "\t-v   Verbose mode\n");
+       fprintf(stderr, "\t-v   Verbosity(-vv dumps any decoded result)\n");
        fprintf(stderr, "\t-s   Give a random seed (and iteration number)\n");
        fprintf(stderr, "\t-m   Give a maximum iteration number\n");
        fprintf(stderr, "\t-i   Give an input file with decoded binary\n");
@@ -188,7 +188,7 @@ static void parse_args(int argc, char **argv)
                        x86_64 = 0;
                        break;
                case 'v':
-                       verbose = 1;
+                       verbose++;
                        break;
                case 'i':
                        if (strcmp("-", optarg) == 0)
@@ -264,7 +264,8 @@ int main(int argc, char **argv)
                        errors++;
                } else if (verbose && !insn_complete(&insn))
                        dump_stream(stdout, "Info: Found an undecodable input", i, insn_buf, &insn);
-
+               else if (verbose >= 2)
+                       dump_insn(stdout, &insn);
                insns++;
        }