ref: 3c2cec93a9475a27f854ac2541f69c4a7a0b3657
dir: /objdump/main.c/
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../inc/arg.h"
#include "../inc/scc.h"
#include "../inc/myro.h"
char *argv0;
static char *strings;
static size_t strsiz;
struct obj_info {
char *fname;
FILE *fp;
struct myrohdr hdr;
fpos_t strpos;
fpos_t secpos;
fpos_t sympos;
fpos_t relpos;
fpos_t datapos;
};
static char *
getstring(unsigned long off)
{
size_t n;
if ((int32_t) off == -1)
return "";
if (off < SIZE_MAX) {
for (n = off; n < strsiz && strings[n]; ++n)
;
if (n < strsiz)
return &strings[off];
}
fprintf(stderr, "objdump: wrong string offset %lu\n", off);
return "";
}
static int
printhdr(struct obj_info *obj)
{
struct myrohdr *hdr = &obj->hdr;
printf("header:\n"
" magic: %02x %02x %02x %02x \"%4.4s\"\n"
" format: %lu (\"%s\")\n"
" entry: %llu\n"
" string table size: %llu\n"
" section table size: %llu\n"
" symbol table size: %llu\n"
" relocation table size: %llu\n",
hdr->magic[0], hdr->magic[1],
hdr->magic[2], hdr->magic[3],
hdr->magic,
hdr->format, getstring(hdr->format),
hdr->entry,
hdr->strsize,
hdr->secsize,
hdr->symsize,
hdr->relsize);
return 0;
}
static int
printstrings(struct obj_info *obj)
{
size_t off, begin;;
char *s = NULL;
puts("strings:");
for (off = 0; off < strsiz; off++) {
if (s == NULL) {
s = &strings[off];
begin = off;
}
if (strings[off] == '\0') {
printf(" [%zd] \"%s\"\n", begin, s);
s = NULL;
}
}
return 0;
}
static char *
sectflags(struct myrosect *sec)
{
static char flags[10];
char *s = flags + sizeof(flags);
if (sec->flags & MYROSEC_LOAD)
*--s = 'L';
if (sec->flags & MYROSEC_FILE)
*--s = 'F';
if (sec->flags & MYROSEC_ABS)
*--s = 'A';
if (sec->flags & MYROSEC_EXEC)
*--s = 'X';
if (sec->flags & MYROSEC_WRITE)
*--s = 'W';
if (sec->flags & MYROSEC_READ)
*--s = 'R';
return s;
}
static int
printsections(struct obj_info *obj)
{
unsigned long long n, i;
struct myrosect sect;
struct myrohdr *hdr = &obj->hdr;
printf("sections:\n"
" [Nr]\t%s\t%-16s\t%-16s\t%s\t%s\t%s\n",
"Name",
"Offset",
"Size",
"Fill",
"Align",
"Flags");
n = hdr->secsize / MYROSECT_SIZ;
for (i = 0; i < n; ++i) {
if (rdmyrosec(obj->fp, §) < 0)
return -1;
printf(" [%2llu]\t%s\t%016llX\t%016llX\t%02X\t%u\t%s\n",
i,
getstring(sect.name),
sect.offset,
sect.len,
sect.fill,
sect.aligment,
sectflags(§));
}
return 0;
}
static char *
symflags(struct myrosym *sym)
{
static char flags[10];
char *s = flags + sizeof(flags);
if (sym->flags & MYROSYM_COMMON)
*--s = 'C';
if (sym->flags & MYROSYM_EXTERN)
*--s = 'G';
if (sym->flags & MYROSYM_UNDEF)
*s-- = 'U';
return s;
}
static int
printsymbols(struct obj_info *obj)
{
unsigned long long n, i;
struct myrosym sym;
struct myrohdr *hdr = &obj->hdr;
printf("symbols:\n"
" [Nr]\t%s\t%-16s\t%s\t%s\t%s\t%s\n",
"Name",
"Value",
"Section",
"Flags",
"Size",
"Type");
n = hdr->symsize / MYROSYM_SIZ;
for (i = 0; i < n; ++i) {
if (rdmyrosym(obj->fp, &sym) < 0)
return -1;
printf(" [%2llu]\t%s\t%016llX\t%u\t%s\t%llu\t%s\n",
i,
getstring(sym.name),
sym.offset,
sym.section,
symflags(&sym),
sym.len,
getstring(sym.type));
}
return 0;
}
static int
printrelocs(struct obj_info *obj)
{
unsigned long long n, i;
struct myrorel rel;
struct myrohdr *hdr = &obj->hdr;
printf("relocs:\n"
" [Nr]\t%-16s\tType\tId\tSize\tNbits\tShift\n",
"Offset");
n = hdr->relsize / MYROREL_SIZ;
for (i = 0; i < n; ++i) {
if (rdmyrorel(obj->fp, &rel) < 0)
return -1;
printf(" [%2llu]\t%016llX\t%s\t%lu\t%u\t%u\t%u\n",
i,
rel.offset,
(rel.id & 1<<31) ? "section" : "symbol",
rel.id & ~(1<<31),
rel.size,
rel.nbits,
rel.shift);
}
return 0;
}
static int
printdata(struct obj_info *obj)
{
unsigned long long off;
int c, i, j;
puts("data:");
for (off = 0; ; off += 32) {
printf(" %016llX:", off);
for (i = 0; i < 2; i++) {
for (j = 0; j < 8; j++) {
if ((c = getc(obj->fp)) == EOF)
goto exit_loop;
printf(" %02X", c);
}
putchar('\t');
}
putchar('\n');
}
exit_loop:
putchar('\n');
return (ferror(obj->fp)) ? -1 : 0;
}
void
dump(char *fname, FILE *fp)
{
struct obj_info obj;
struct myrohdr *hdr;
obj.fname = fname;
obj.fp = fp;
hdr = &obj.hdr;
if (rdmyrohdr(obj.fp, hdr) < 0)
goto wrong_file;
if (strncmp(hdr->magic, MYROMAGIC, MYROMAGIC_SIZ)) {
fprintf(stderr,
"objdump: %s: File format not recognized\n",
fname);
return;
}
puts(fname);
if (hdr->strsize > SIZE_MAX) {
fprintf(stderr,
"objdump: %s: overflow in header\n",
fname);
return;
}
strsiz = hdr->strsize;
if (strsiz > 0) {
strings = xmalloc(strsiz);
fread(strings, strsiz, 1, fp);
if (feof(fp))
goto wrong_file;
}
if (printhdr(&obj) < 0)
goto wrong_file;
if (printstrings(&obj) < 0)
goto wrong_file;
if (printsections(&obj) < 0)
goto wrong_file;
if (printsymbols(&obj) < 0)
goto wrong_file;
if (printrelocs(&obj) < 0)
goto wrong_file;
if (printdata(&obj) < 0)
goto wrong_file;
return;
wrong_file:
fprintf(stderr,
"objdump: %s: %s\n",
fname, strerror(errno));
}
void
doit(char *fname)
{
FILE *fp;
if ((fp = fopen(fname, "rb")) == NULL) {
fprintf(stderr, "objdump: %s: %s\n", fname, strerror(errno));
return;
}
dump(fname, fp);
fclose(fp);
}
void
usage(void)
{
fputs("usage: objdump file ...\n", stderr);
exit(1);
}
int
main(int argc, char *argv[])
{
ARGBEGIN {
default:
usage();
} ARGEND
if (argc == 0)
doit("a.out");
else while (*argv) {
free(strings);
strings = NULL;
doit(*argv++);
}
if (fclose(stdout) == EOF)
die("objdump: stdout: %s", strerror(errno));
return 0;
}