x86: Add verbose option to insn decoder test

Add verbose option to insn decoder test. This dumps decoded
instruction when building kernel with V=1.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
LKML-Reference: <20091116230618.5250.18762.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 71 insertions, 12 deletions

diff --git a/arch/x86/tools/Makefile b/arch/x86/tools/Makefile
index 5e295d95dc25..4688f90ce5a2 100644
--- a/arch/x86/tools/Makefile
+++ b/arch/x86/tools/Makefile
@@ -1,6 +1,13 @@
 PHONY += posttest
+
+ifeq ($(KBUILD_VERBOSE),1)
+  postest_verbose = -v
+else
+  postest_verbose =
+endif
+
 quiet_cmd_posttest = TEST    $@
-      cmd_posttest = $(OBJDUMP) -d -j .text $(objtree)/vmlinux | awk -f $(srctree)/arch/x86/tools/distill.awk | $(obj)/test_get_len $(CONFIG_64BIT)
+      cmd_posttest = $(OBJDUMP) -d -j .text $(objtree)/vmlinux | awk -f $(srctree)/arch/x86/tools/distill.awk | $(obj)/test_get_len -$(CONFIG_64BIT) $(posttest_verbose)
 
 posttest: $(obj)/test_get_len vmlinux
         $(call cmd,posttest)
diff --git a/arch/x86/tools/test_get_len.c b/arch/x86/tools/test_get_len.c
index 376d33852191..5743e5128d35 100644
--- a/arch/x86/tools/test_get_len.c
+++ b/arch/x86/tools/test_get_len.c
@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
+#include <unistd.h>
 
 #define unlikely(cond) (cond)
 
@@ -36,11 +37,16 @@
  */
 
 const char *prog;
+static int verbose;
+static int x86_64;
 
 static void usage(void)
 {
         fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |"
-                " %s [y|n](64bit flag)\n", prog);
+                " %s [-y|-n] [-v] \n", prog);
+        fprintf(stderr, "\t-y   64bit mode\n");
+        fprintf(stderr, "\t-n   32bit mode\n");
+        fprintf(stderr, "\t-v   verbose mode\n");
         exit(1);
 }
 
@@ -50,6 +56,56 @@ static void malformed_line(const char *line, int line_nr)
         exit(3);
 }
 
+static void dump_field(FILE *fp, const char *name, const char *indent,
+                       struct insn_field *field)
+{
+        fprintf(fp, "%s.%s = {\n", indent, name);
+        fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n",
+                indent, field->value, field->bytes[0], field->bytes[1],
+                field->bytes[2], field->bytes[3]);
+        fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent,
+                field->got, field->nbytes);
+}
+
+static void dump_insn(FILE *fp, struct insn *insn)
+{
+        fprintf(fp, "Instruction = { \n");
+        dump_field(fp, "prefixes", "\t",        &insn->prefixes);
+        dump_field(fp, "rex_prefix", "\t",      &insn->rex_prefix);
+        dump_field(fp, "vex_prefix", "\t",      &insn->vex_prefix);
+        dump_field(fp, "opcode", "\t",          &insn->opcode);
+        dump_field(fp, "modrm", "\t",           &insn->modrm);
+        dump_field(fp, "sib", "\t",             &insn->sib);
+        dump_field(fp, "displacement", "\t",    &insn->displacement);
+        dump_field(fp, "immediate1", "\t",      &insn->immediate1);
+        dump_field(fp, "immediate2", "\t",      &insn->immediate2);
+        fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n",
+                insn->attr, insn->opnd_bytes, insn->addr_bytes);
+        fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n",
+                insn->length, insn->x86_64, insn->kaddr);
+}
+
+static void parse_args(int argc, char **argv)
+{
+        int c;
+        prog = argv[0];
+        while ((c = getopt(argc, argv, "ynv")) != -1) {
+                switch (c) {
+                case 'y':
+                        x86_64 = 1;
+                        break;
+                case 'n':
+                        x86_64 = 0;
+                        break;
+                case 'v':
+                        verbose = 1;
+                        break;
+                default:
+                        usage();
+                }
+        }
+}
+
 #define BUFSIZE 256
 
 int main(int argc, char **argv)
@@ -57,15 +113,9 @@ int main(int argc, char **argv)
         char line[BUFSIZE];
         unsigned char insn_buf[16];
         struct insn insn;
-        int insns = 0;
-        int x86_64 = 0;
-
-        prog = argv[0];
-        if (argc > 2)
-                usage();
+        int insns = 0, c;
 
-        if (argc == 2 && argv[1][0] == 'y')
-                x86_64 = 1;
+        parse_args(argc, argv);
 
         while (fgets(line, BUFSIZE, stdin)) {
                 char copy[BUFSIZE], *s, *tab1, *tab2;
@@ -97,8 +147,10 @@ int main(int argc, char **argv)
                 if (insn.length != nb) {
                         fprintf(stderr, "Error: %s", line);
                         fprintf(stderr, "Error: objdump says %d bytes, but "
-                                "insn_get_length() says %d (attr:%x)\n", nb,
-                                insn.length, insn.attr);
+                                "insn_get_length() says %d\n", nb,
+                                insn.length);
+                        if (verbose)
+                                dump_insn(stderr, &insn);
                         exit(2);
                 }
         }