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Diffstat (limited to 'arch/x86/tools/test_get_len.c')
-rw-r--r--arch/x86/tools/test_get_len.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/x86/tools/test_get_len.c b/arch/x86/tools/test_get_len.c
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+++ b/arch/x86/tools/test_get_len.c
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+/*
+ * 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>
+
+#ifdef __x86_64__
+#define CONFIG_X86_64
+#else
+#define CONFIG_X86_32
+#endif
+#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 void usage(void)
+{
+ fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |"
+ " ./test_get_len\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);
+}
+
+#define BUFSIZE 256
+
+int main(int argc, char **argv)
+{
+ char line[BUFSIZE];
+ unsigned char insn_buf[16];
+ struct insn insn;
+ int insns = 0;
+
+ prog = argv[0];
+ if (argc > 1)
+ usage();
+
+ while (fgets(line, BUFSIZE, stdin)) {
+ char copy[BUFSIZE], *s, *tab1, *tab2;
+ int nb = 0;
+ unsigned int b;
+
+ 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 */
+#ifdef __x86_64__
+ insn_init(&insn, insn_buf, 1);
+#else
+ insn_init(&insn, insn_buf, 0);
+#endif
+ insn_get_length(&insn);
+ 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);
+ exit(2);
+ }
+ }
+ fprintf(stderr, "Succeed: decoded and checked %d instructions\n",
+ insns);
+ return 0;
+}