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172 lines
4.1 KiB
172 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) IBM Corporation, 2009 |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <assert.h> |
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#include <unistd.h> |
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#include <stdarg.h> |
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#define unlikely(cond) (cond) |
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#include <asm/insn.h> |
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#include <inat.c> |
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#include <insn.c> |
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/* |
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* Test of instruction analysis in general and insn_get_length() in |
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* particular. See if insn_get_length() and the disassembler agree |
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* on the length of each instruction in an elf disassembly. |
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* |
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* Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test |
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*/ |
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const char *prog; |
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static int verbose; |
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static int x86_64; |
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static void usage(void) |
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{ |
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fprintf(stderr, "Usage: objdump -d a.out | awk -f objdump_reformat.awk" |
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" | %s [-y|-n] [-v]\n", prog); |
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fprintf(stderr, "\t-y 64bit mode\n"); |
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fprintf(stderr, "\t-n 32bit mode\n"); |
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fprintf(stderr, "\t-v verbose mode\n"); |
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exit(1); |
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} |
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static void malformed_line(const char *line, int line_nr) |
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{ |
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fprintf(stderr, "%s: error: malformed line %d:\n%s", |
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prog, line_nr, line); |
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exit(3); |
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} |
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static void pr_warn(const char *fmt, ...) |
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{ |
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va_list ap; |
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fprintf(stderr, "%s: warning: ", prog); |
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va_start(ap, fmt); |
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vfprintf(stderr, fmt, ap); |
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va_end(ap); |
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} |
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static void dump_field(FILE *fp, const char *name, const char *indent, |
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struct insn_field *field) |
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{ |
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fprintf(fp, "%s.%s = {\n", indent, name); |
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fprintf(fp, "%s\t.value = %d, bytes[] = {%x, %x, %x, %x},\n", |
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indent, field->value, field->bytes[0], field->bytes[1], |
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field->bytes[2], field->bytes[3]); |
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fprintf(fp, "%s\t.got = %d, .nbytes = %d},\n", indent, |
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field->got, field->nbytes); |
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} |
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static void dump_insn(FILE *fp, struct insn *insn) |
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{ |
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fprintf(fp, "Instruction = {\n"); |
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dump_field(fp, "prefixes", "\t", &insn->prefixes); |
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dump_field(fp, "rex_prefix", "\t", &insn->rex_prefix); |
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dump_field(fp, "vex_prefix", "\t", &insn->vex_prefix); |
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dump_field(fp, "opcode", "\t", &insn->opcode); |
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dump_field(fp, "modrm", "\t", &insn->modrm); |
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dump_field(fp, "sib", "\t", &insn->sib); |
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dump_field(fp, "displacement", "\t", &insn->displacement); |
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dump_field(fp, "immediate1", "\t", &insn->immediate1); |
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dump_field(fp, "immediate2", "\t", &insn->immediate2); |
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fprintf(fp, "\t.attr = %x, .opnd_bytes = %d, .addr_bytes = %d,\n", |
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insn->attr, insn->opnd_bytes, insn->addr_bytes); |
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fprintf(fp, "\t.length = %d, .x86_64 = %d, .kaddr = %p}\n", |
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insn->length, insn->x86_64, insn->kaddr); |
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} |
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static void parse_args(int argc, char **argv) |
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{ |
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int c; |
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prog = argv[0]; |
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while ((c = getopt(argc, argv, "ynv")) != -1) { |
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switch (c) { |
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case 'y': |
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x86_64 = 1; |
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break; |
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case 'n': |
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x86_64 = 0; |
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break; |
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case 'v': |
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verbose = 1; |
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break; |
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default: |
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usage(); |
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} |
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} |
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} |
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#define BUFSIZE 256 |
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int main(int argc, char **argv) |
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{ |
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char line[BUFSIZE], sym[BUFSIZE] = "<unknown>"; |
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unsigned char insn_buff[16]; |
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struct insn insn; |
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int insns = 0; |
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int warnings = 0; |
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parse_args(argc, argv); |
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while (fgets(line, BUFSIZE, stdin)) { |
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char copy[BUFSIZE], *s, *tab1, *tab2; |
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int nb = 0; |
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unsigned int b; |
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if (line[0] == '<') { |
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/* Symbol line */ |
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strcpy(sym, line); |
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continue; |
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} |
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insns++; |
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memset(insn_buff, 0, 16); |
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strcpy(copy, line); |
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tab1 = strchr(copy, '\t'); |
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if (!tab1) |
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malformed_line(line, insns); |
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s = tab1 + 1; |
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s += strspn(s, " "); |
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tab2 = strchr(s, '\t'); |
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if (!tab2) |
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malformed_line(line, insns); |
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*tab2 = '\0'; /* Characters beyond tab2 aren't examined */ |
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while (s < tab2) { |
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if (sscanf(s, "%x", &b) == 1) { |
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insn_buff[nb++] = (unsigned char) b; |
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s += 3; |
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} else |
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break; |
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} |
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/* Decode an instruction */ |
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insn_init(&insn, insn_buff, sizeof(insn_buff), x86_64); |
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insn_get_length(&insn); |
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if (insn.length != nb) { |
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warnings++; |
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pr_warn("Found an x86 instruction decoder bug, " |
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"please report this.\n", sym); |
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pr_warn("%s", line); |
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pr_warn("objdump says %d bytes, but insn_get_length() " |
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"says %d\n", nb, insn.length); |
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if (verbose) |
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dump_insn(stderr, &insn); |
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} |
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} |
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if (warnings) |
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pr_warn("Decoded and checked %d instructions with %d " |
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"failures\n", insns, warnings); |
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else |
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fprintf(stdout, "%s: success: Decoded and checked %d" |
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" instructions\n", prog, insns); |
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return 0; |
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}
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