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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /arch/x86/tools/insn_decoder_test.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/tools/insn_decoder_test.c')
-rw-r--r--arch/x86/tools/insn_decoder_test.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c
new file mode 100644
index 000000000..34eda63c1
--- /dev/null
+++ b/arch/x86/tools/insn_decoder_test.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) IBM Corporation, 2009
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdarg.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 objdump_reformat.awk | ./insn_decoder_test
+ */
+
+const char *prog;
+static int verbose;
+static int x86_64;
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.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: error: malformed line %d:\n%s",
+ prog, line_nr, line);
+ exit(3);
+}
+
+static void pr_warn(const char *fmt, ...)
+{
+ va_list ap;
+
+ fprintf(stderr, "%s: warning: ", prog);
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+}
+
+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_buff[16];
+ struct insn insn;
+ int insns = 0;
+ int warnings = 0;
+
+ 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_buff, 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_buff[nb++] = (unsigned char) b;
+ s += 3;
+ } else
+ break;
+ }
+ /* Decode an instruction */
+ insn_init(&insn, insn_buff, sizeof(insn_buff), x86_64);
+ insn_get_length(&insn);
+ if (insn.length != nb) {
+ warnings++;
+ pr_warn("Found an x86 instruction decoder bug, "
+ "please report this.\n", sym);
+ pr_warn("%s", line);
+ pr_warn("objdump says %d bytes, but insn_get_length() "
+ "says %d\n", nb, insn.length);
+ if (verbose)
+ dump_insn(stderr, &insn);
+ }
+ }
+ if (warnings)
+ pr_warn("Decoded and checked %d instructions with %d "
+ "failures\n", insns, warnings);
+ else
+ fprintf(stdout, "%s: success: Decoded and checked %d"
+ " instructions\n", prog, insns);
+ return 0;
+}