static int check_bytes(const ut8 *buf, ut64 length) {
if (buf && length >= 4) {
ut32 cls = r_mem_get_num (buf, 4);
ut32 cls2 = r_mem_get_num (buf + 4, 4);
if (cls + 4 == length && !cls2) {
return true;
}
}
return false;
}
static int size(RBinFile *arch) {
ut64 text, data, syms, spsz;
int big_endian;
if (!arch->o->info)
arch->o->info = info (arch);
big_endian = arch->o->info->big_endian;
// TODO: reuse section list
text = r_mem_get_num (arch->buf->buf+4, 4, big_endian);
data = r_mem_get_num (arch->buf->buf+8, 4, big_endian);
syms = r_mem_get_num (arch->buf->buf+16, 4, big_endian);
spsz = r_mem_get_num (arch->buf->buf+24, 4, big_endian);
return text+data+syms+spsz+(6*4);
}
static ut64 size(RBinFile *bf) {
ut64 text, data, syms, spsz;
int big_endian;
if (!bf->o->info) {
bf->o->info = info (bf);
}
if (!bf->o->info) {
return 0;
}
big_endian = bf->o->info->big_endian;
// TODO: reuse section list
text = r_mem_get_num (bf->buf->buf + 4, 4, big_endian);
data = r_mem_get_num (bf->buf->buf + 8, 4, big_endian);
syms = r_mem_get_num (bf->buf->buf + 16, 4, big_endian);
spsz = r_mem_get_num (bf->buf->buf + 24, 4, big_endian);
return text + data + syms + spsz + (6 * 4);
}
static ut64 is_pointer(RIOBind *iob, const ut8 *buf, int endian, int size) {
ut8 buf2[32];
int ret;
ut64 n = r_mem_get_num (buf, size, endian);
if (!n) return 1; // null pointer
ret = iob->read_at (iob->io, n, buf2, size);
if (ret != size) return 0;
return is_invalid (buf2, size)? 0: n;
}
static RList* sections(RBinFile *arch) {
RList *ret = NULL;
RBinSection *ptr = NULL;
ut64 textsize, datasize, symssize, spszsize, pcszsize;
ut64 entry0 = findEntry (arch->buf, 0);
ut64 entry1 = findEntry (arch->buf, 1);
ut64 entry2 = findEntry (arch->buf, 2);
if (!(ret = r_list_newf (free))) {
return NULL;
}
// add text segment
textsize = r_mem_get_num (arch->buf->buf + 4, 4);
if (!(ptr = R_NEW0 (RBinSection))) {
return ret;
}
if (!entry1) {
entry1 = arch->buf->length;
}
strncpy (ptr->name, "init", R_BIN_SIZEOF_STRINGS);
ptr->size = entry1-entry0;
ptr->vsize = entry1-entry0;
ptr->paddr = entry0 + 4;
ptr->vaddr = entry0;
ptr->srwx = R_BIN_SCN_READABLE | R_BIN_SCN_EXECUTABLE | R_BIN_SCN_MAP; // r-x
r_list_append (ret, ptr);
if (entry1) {
if (entry2) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "fini", R_BIN_SIZEOF_STRINGS);
ptr->size = entry2-entry1;
ptr->vsize = entry2-entry1;
ptr->paddr = entry1 + 4;
ptr->vaddr = entry1;
ptr->srwx = R_BIN_SCN_READABLE | R_BIN_SCN_EXECUTABLE | R_BIN_SCN_MAP; // r-x
r_list_append (ret, ptr);
} else {
entry2 = entry1;
}
}
if (entry2) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "text", R_BIN_SIZEOF_STRINGS);
ptr->size = arch->buf->length - entry2;
ptr->vsize = arch->buf->length - entry2;
ptr->paddr = entry2 + 4;
ptr->vaddr = entry2;
ptr->srwx = R_BIN_SCN_READABLE | R_BIN_SCN_EXECUTABLE | R_BIN_SCN_MAP; // r-x
r_list_append (ret, ptr);
}
return ret;
}
static ut64 is_pointer(RIOBind *iob, const ut8 *buf, int endian, int size) {
ut8 buf2[32];
int ret;
if (size > sizeof (buf2))
size = sizeof (buf2);
ut64 n = r_mem_get_num (buf, size, endian);
if (!n) return 1; // null pointer
// optimization to ignore very low and very high pointers
// this makes disasm 5x faster, but can result in some false positives
if (n<0x1000) return 0; // probably wrong
if (n>0xffffffffffff) return 0; // probably wrong
ret = iob->read_at (iob->io, n, buf2, size);
if (ret != size) return 0;
return is_invalid (buf2, size)? 0: n;
}
static ut64 is_pointer(RIOBind *iob, const ut8 *buf, int endian, int size) {
ut64 n;
ut8 buf2[32];
int ret;
if (size > sizeof (buf2))
size = sizeof (buf2);
n = r_mem_get_num (buf, size, endian);
if (!n) return 1; // null pointer
// optimization to ignore very low and very high pointers
// this makes disasm 5x faster, but can result in some false positives
// we should compare with current offset, to avoid
// short/long references. and discard invalid ones
if (n<0x1000) return 0; // probably wrong
if (n>0xffffffffffffLL) return 0; // probably wrong
ret = iob->read_at (iob->io, n, buf2, size);
if (ret != size) return 0;
return is_invalid (buf2, size)? 0: n;
}
static ut64 is_pointer(RAnal *anal, const ut8 *buf, int size) {
ut64 n;
ut8 buf2[32];
RIOBind *iob = &anal->iob;
if (size > sizeof (buf2))
size = sizeof (buf2);
n = r_mem_get_num (buf, size);
if (!n) return 1; // null pointer
#if USE_IS_VALID_OFFSET
int r = iob->is_valid_offset (iob->io, n, 0);
return r? n: 0LL;
#else
// optimization to ignore very low and very high pointers
// this makes disasm 5x faster, but can result in some false positives
// we should compare with current offset, to avoid
// short/long references. and discard invalid ones
if (n < 0x1000) return 0; // probably wrong
if (n > 0xffffffffffffLL) return 0; // probably wrong
if (iob->read_at (iob->io, n, buf2, size) != size) return 0;
return is_invalid (buf2, size)? 0: n;
#endif
}
static int is_number (const ut8 *buf, int endian, int size) {
ut64 n = r_mem_get_num (buf, size, endian);
return (n<UT32_MAX)? (int)n: 0;
}
static RList* sections(RBinFile *arch) {
RList *ret = NULL;
RBinSection *ptr = NULL;
ut64 textsize, datasize, symssize, spszsize, pcszsize;
int big_endian = arch->o->info->big_endian;
if (!(ret = r_list_new ()))
return NULL;
ret->free = free;
// add text segment
textsize = r_mem_get_num (arch->buf->buf+4, 4, big_endian);
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "text", R_BIN_SIZEOF_STRINGS);
ptr->size = textsize;
ptr->vsize = textsize + (textsize%4096);
ptr->paddr = 8*4;
ptr->vaddr = ptr->paddr;
ptr->srwx = 5; // r-x
r_list_append (ret, ptr);
// add data segment
datasize = r_mem_get_num (arch->buf->buf+8, 4, big_endian);
if (datasize>0) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "data", R_BIN_SIZEOF_STRINGS);
ptr->size = datasize;
ptr->vsize = datasize + (datasize%4096);
ptr->paddr = textsize+(8*4);
ptr->vaddr = ptr->paddr;
ptr->srwx = 6; // rw-
r_list_append (ret, ptr);
}
// ignore bss or what
// add syms segment
symssize = r_mem_get_num (arch->buf->buf+16, 4, big_endian);
if (symssize) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "syms", R_BIN_SIZEOF_STRINGS);
ptr->size = symssize;
ptr->vsize = symssize + (symssize%4096);
ptr->paddr = datasize+textsize+(8*4);
ptr->vaddr = ptr->paddr;
ptr->srwx = 4; // r--
r_list_append (ret, ptr);
}
// add spsz segment
spszsize = r_mem_get_num (arch->buf->buf+24, 4, big_endian);
if (spszsize) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "spsz", R_BIN_SIZEOF_STRINGS);
ptr->size = spszsize;
ptr->vsize = spszsize + (spszsize%4096);
ptr->paddr = symssize+datasize+textsize+(8*4);
ptr->vaddr = ptr->paddr;
ptr->srwx = 4; // r--
r_list_append (ret, ptr);
}
// add pcsz segment
pcszsize = r_mem_get_num (arch->buf->buf+24, 4, big_endian);
if (pcszsize) {
if (!(ptr = R_NEW0 (RBinSection)))
return ret;
strncpy (ptr->name, "pcsz", R_BIN_SIZEOF_STRINGS);
ptr->size = pcszsize;
ptr->vsize = pcszsize + (pcszsize%4096);
ptr->paddr = spszsize+symssize+datasize+textsize+(8*4);
ptr->vaddr = ptr->paddr;
ptr->srwx = 4; // r--
r_list_append (ret, ptr);
}
return ret;
}
