radare2/libr/reg/value.c

288 lines
7.8 KiB
C

/* radare - LGPL - Copyright 2009-2018 - pancake */
#include <r_reg.h>
#include <r_util.h>
typedef ut32 ut27;
static ut27 r_read_me27(const ut8 *buf, int boff) {
ut27 ret = 0;
r_mem_copybits_delta ((ut8 *)&ret, 18, buf, boff, 9);
r_mem_copybits_delta ((ut8 *)&ret, 9, buf, boff + 9, 9);
r_mem_copybits_delta ((ut8 *)&ret, 0, buf, boff + 18, 9);
return ret;
}
R_API ut64 r_reg_get_value_big(RReg *reg, RRegItem *item, utX *val) {
RRegSet *regset;
int off;
ut64 ret = 0LL;
if (!reg || !item) {
return 0LL;
}
off = BITS2BYTES (item->offset);
regset = &reg->regset[item->arena];
switch (item->size) {
case 80: // word + qword
if (regset->arena->bytes && (off + 10 <= regset->arena->size)) {
val->v80.Low = *((ut64 *)(regset->arena->bytes + off));
val->v80.High = *((ut16 *)(regset->arena->bytes + off + 8));
} else {
eprintf ("r_reg_get_value: null or oob arena for current regset\n");
}
ret = val->v80.Low;
break;
case 96: // dword + qword
if (regset->arena->bytes && (off + 12 <= regset->arena->size)) {
val->v96.Low = *((ut64 *)(regset->arena->bytes + off));
val->v96.High = *((ut32 *)(regset->arena->bytes + off + 8));
} else {
eprintf ("r_reg_get_value: null or oob arena for current regset\n");
}
ret = val->v96.Low;
break;
case 128: // qword + qword
if (regset->arena->bytes && (off + 16 <= regset->arena->size)) {
val->v128.Low = *((ut64 *)(regset->arena->bytes + off));
val->v128.High = *((ut64 *)(regset->arena->bytes + off + 8));
} else {
eprintf ("r_reg_get_value: null or oob arena for current regset\n");
}
ret = val->v128.Low;
break;
//case 256:// qword + qword + qword + qword
// break;
default:
eprintf ("r_reg_get_value_big: Bit size %d not supported\n", item->size);
break;
}
return ret;
}
R_API ut64 r_reg_get_value(RReg *reg, RRegItem *item) {
if (!reg || !item || item->offset == -1) {
return 0LL;
}
int off = BITS2BYTES (item->offset);
RRegSet *regset = &reg->regset[item->arena];
switch (item->size) {
case 1: {
int offset = item->offset / 8;
if (offset + item->size >= regset->arena->size) {
break;
}
return (regset->arena->bytes[offset] &
(1 << (item->offset % 8)))
? 1
: 0;
} break;
case 4:
if (regset->arena->size - off - 1 >= 0) {
return (r_read_at_ble8 (regset->arena->bytes, off)) & 0xF;
}
break;
case 8:
if (regset->arena->size - off - 1 >= 0) {
return r_read_at_ble8 (regset->arena->bytes, off);
}
break;
case 16:
if (regset->arena->size - off - 2 >= 0) {
return r_read_ble16 (regset->arena->bytes + off, reg->big_endian);
}
break;
case 27:
if (off + 3 < regset->arena->size) {
return r_read_me27 (regset->arena->bytes + off, 0);
}
break;
case 32:
if (off + 4 <= regset->arena->size) {
return r_read_ble32 (regset->arena->bytes + off, reg->big_endian);
}
eprintf ("r_reg_get_value: 32bit oob read %d\n", off);
break;
case 64:
if (regset->arena && regset->arena->bytes && (off + 8 <= regset->arena->size)) {
return r_read_ble64 (regset->arena->bytes + off, reg->big_endian);
}
//eprintf ("r_reg_get_value: null or oob arena for current regset\n");
break;
case 80: // long double
case 96: // long floating value
// FIXME: It is a precision loss, please implement me properly!
return (ut64)r_reg_get_longdouble (reg, item);
default:
eprintf ("r_reg_get_value: Bit size %d not supported\n", item->size);
break;
}
return 0LL;
}
R_API ut64 r_reg_get_value_by_role(RReg *reg, RRegisterId role) {
// TODO use mapping from RRegisterId to RRegItem (via RRegSet)
return r_reg_get_value (reg, r_reg_get (reg, r_reg_get_name (reg, role), -1));
}
R_API bool r_reg_set_value(RReg *reg, RRegItem *item, ut64 value) {
int fits_in_arena;
ut8 bytes[12];
ut8 *src = bytes;
if (!item) {
eprintf ("r_reg_set_value: item is NULL\n");
return false;
}
switch (item->size) {
case 80:
case 96: // long floating value
r_reg_set_longdouble (reg, item, (long double)value);
break;
case 64:
if (reg->big_endian) {
r_write_be64 (src, value);
} else {
r_write_le64 (src, value);
}
break;
case 32:
if (reg->big_endian) {
r_write_be32 (src, value);
} else {
r_write_le32 (src, value);
}
break;
case 16:
if (reg->big_endian) {
r_write_be16 (src, value);
} else {
r_write_le16 (src, value);
}
break;
case 8:
r_write_ble8 (src, (ut8) (value & UT8_MAX));
break;
case 1:
if (value) {
ut8 *buf = reg->regset[item->arena].arena->bytes + (item->offset / 8);
int bit = (item->offset % 8);
ut8 mask = (1 << bit);
buf[0] = (buf[0] & (0xff ^ mask)) | mask;
} else {
int idx = item->offset / 8;
RRegArena *arena = reg->regset[item->arena].arena;
if (idx + item->size > arena->size) {
eprintf ("RRegSetOverflow %d vs %d\n", idx + item->size, arena->size);
return false;
}
ut8 *buf = arena->bytes + idx;
int bit = item->offset % 8;
ut8 mask = 0xff ^ (1 << bit);
buf[0] = (buf[0] & mask) | 0;
}
return true;
default:
eprintf ("r_reg_set_value: Bit size %d not supported\n", item->size);
return false;
}
fits_in_arena = (reg->regset[item->arena].arena->size - BITS2BYTES (item->offset) - BITS2BYTES (item->size)) >= 0;
if (src && fits_in_arena) {
r_mem_copybits (reg->regset[item->arena].arena->bytes +
BITS2BYTES (item->offset),
src, item->size);
return true;
}
eprintf ("r_reg_set_value: Cannot set %s to 0x%" PFMT64x "\n", item->name, value);
return false;
}
R_API bool r_reg_set_value_by_role(RReg *reg, RRegisterId role, ut64 val) {
// TODO use mapping from RRegisterId to RRegItem (via RRegSet)
RRegItem *r = r_reg_get (reg, r_reg_get_name (reg, role), -1);
return r_reg_set_value (reg, r, val);
}
R_API ut64 r_reg_set_bvalue(RReg *reg, RRegItem *item, const char *str) {
ut64 num = UT64_MAX;
if (item && item->flags && str) {
num = r_str_bits_from_string (str, item->flags);
if (num == UT64_MAX) {
num = r_num_math (NULL, str);
}
r_reg_set_value (reg, item, num);
}
return num;
}
R_API R_HEAP char *r_reg_get_bvalue(RReg *reg, RRegItem *item) {
char *out = NULL;
if (reg && item && item->flags) {
out = malloc (strlen (item->flags) + 1);
if (out) {
ut64 num = r_reg_get_value (reg, item);
r_str_bits (out, (ut8 *)&num,
strlen (item->flags) * 8, item->flags);
}
}
return out;
}
/* packed registers */
// packbits can be 8, 16, 32 or 64
// result value is always casted into ut64
// TODO: use item->packed_size
R_API ut64 r_reg_get_pack(RReg *reg, RRegItem *item, int packidx, int packbits) {
int packbytes, packmod;
ut64 ret = 0LL;
RRegSet *regset;
int off;
if (!reg || !item) {
return 0LL;
}
if (packbits < 1) {
packbits = item->packed_size;
}
packbytes = packbits / 8;
packmod = packbits % 8;
if (packmod) {
eprintf ("Invalid bit size for packet register\n");
return 0LL;
}
off = BITS2BYTES (item->offset);
regset = &reg->regset[item->arena];
off += (packidx * packbytes);
if (regset->arena->size - off - 1 >= 0) {
memcpy (&ret, regset->arena->bytes + off, packbytes);
}
return ret;
}
R_API int r_reg_set_pack(RReg *reg, RRegItem *item, int packidx, int packbits, ut64 val) {
int off, packbytes, packmod;
if (!reg || !item) {
eprintf ("r_reg_set_value: item is NULL\n");
return false;
}
if (packbits < 1) {
packbits = item->packed_size;
}
off = item->offset;
packbytes = packbits / 8;
packmod = packbits % 8;
if (packidx * packbits > item->size) {
eprintf ("Packed index is beyond the register size\n");
return false;
}
if (packmod) {
eprintf ("Invalid bit size for packet register\n");
return false;
}
if (reg->regset[item->arena].arena->size - BITS2BYTES (off) - BITS2BYTES (packbytes) >= 0) {
ut8 *dst = reg->regset[item->arena].arena->bytes + BITS2BYTES (off);
r_mem_copybits (dst, (ut8 *)&val, packbytes);
return true;
}
eprintf ("r_reg_set_value: Cannot set %s to 0x%" PFMT64x "\n", item->name, val);
return false;
}