/* * 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; 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_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) { warnings++; fprintf(stderr, "Warning: %s found difference at %s\n", prog, sym); fprintf(stderr, "Warning: %s", line); fprintf(stderr, "Warning: objdump says %d bytes, but " "insn_get_length() says %d\n", nb, insn.length); if (verbose) dump_insn(stderr, &insn); } } if (warnings) fprintf(stderr, "Warning: decoded and checked %d" " instructions with %d warnings\n", insns, warnings); else fprintf(stderr, "Succeed: decoded and checked %d" " instructions\n", insns); return 0; }