1 files changed, 168 insertions, 0 deletions

diff --git a/arch/x86/tools/test_get_len.c b/arch/x86/tools/test_get_len.c
new file mode 100644
index 000000000000..af75e07217ba
--- /dev/null
+++ b/arch/x86/tools/test_get_len.c
@@ -0,0 +1,168 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2009
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+
+#define unlikely(cond) (cond)
+
+#include <asm/insn.h>
+#include <inat.c>
+#include <insn.c>
+
+/*
+ * Test of instruction analysis in general and insn_get_length() in
+ * particular.  See if insn_get_length() and the disassembler agree
+ * on the length of each instruction in an elf disassembly.
+ *
+ * Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
+ */
+
+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] [-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);
+}
+
+static void malformed_line(const char *line, int line_nr)
+{
+        fprintf(stderr, "%s: malformed line %d:\n%s", prog, line_nr, line);
+        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)
+{
+        char line[BUFSIZE], sym[BUFSIZE] = "<unknown>";
+        unsigned char insn_buf[16];
+        struct insn insn;
+        int insns = 0, c;
+
+        parse_args(argc, argv);
+
+        while (fgets(line, BUFSIZE, stdin)) {
+                char copy[BUFSIZE], *s, *tab1, *tab2;
+                int nb = 0;
+                unsigned int b;
+
+                if (line[0] == '<') {
+                        /* Symbol line */
+                        strcpy(sym, line);
+                        continue;
+                }
+
+                insns++;
+                memset(insn_buf, 0, 16);
+                strcpy(copy, line);
+                tab1 = strchr(copy, '\t');
+                if (!tab1)
+                        malformed_line(line, insns);
+                s = tab1 + 1;
+                s += strspn(s, " ");
+                tab2 = strchr(s, '\t');
+                if (!tab2)
+                        malformed_line(line, insns);
+                *tab2 = '\0';   /* Characters beyond tab2 aren't examined */
+                while (s < tab2) {
+                        if (sscanf(s, "%x", &b) == 1) {
+                                insn_buf[nb++] = (unsigned char) b;
+                                s += 3;
+                        } else
+                                break;
+                }
+                /* Decode an instruction */
+                insn_init(&insn, insn_buf, x86_64);
+                insn_get_length(&insn);
+                if (insn.length != nb) {
+                        fprintf(stderr, "Error: %s found a difference at %s\n",
+                                prog, sym);
+                        fprintf(stderr, "Error: %s", line);
+                        fprintf(stderr, "Error: objdump says %d bytes, but "
+                                "insn_get_length() says %d\n", nb,
+                                insn.length);
+                        if (verbose)
+                                dump_insn(stderr, &insn);
+                        exit(2);
+                }
+        }
+        fprintf(stderr, "Succeed: decoded and checked %d instructions\n",
+                insns);
+        return 0;
+}