mirror of
https://github.com/radareorg/radare2.git
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285 lines
7.8 KiB
C
285 lines
7.8 KiB
C
/* radare - LGPL - Copyright 2009-2019 - pancake */
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#include <r_reg.h>
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#include <r_util.h>
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typedef ut32 ut27;
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static ut27 r_read_me27(const ut8 *buf, int boff) {
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ut27 ret = 0;
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r_mem_copybits_delta ((ut8 *)&ret, 18, buf, boff, 9);
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r_mem_copybits_delta ((ut8 *)&ret, 9, buf, boff + 9, 9);
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r_mem_copybits_delta ((ut8 *)&ret, 0, buf, boff + 18, 9);
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return ret;
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}
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R_API ut64 r_reg_get_value_big(RReg *reg, RRegItem *item, utX *val) {
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RRegSet *regset;
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int off;
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ut64 ret = 0LL;
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r_return_val_if_fail (reg && item, 0);
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off = BITS2BYTES (item->offset);
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regset = ®->regset[item->arena];
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switch (item->size) {
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case 80: // word + qword
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if (regset->arena->bytes && (off + 10 <= regset->arena->size)) {
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val->v80.Low = *((ut64 *)(regset->arena->bytes + off));
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val->v80.High = *((ut16 *)(regset->arena->bytes + off + 8));
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} else {
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eprintf ("r_reg_get_value: null or oob arena for current regset\n");
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}
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ret = val->v80.Low;
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break;
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case 96: // dword + qword
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if (regset->arena->bytes && (off + 12 <= regset->arena->size)) {
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val->v96.Low = *((ut64 *)(regset->arena->bytes + off));
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val->v96.High = *((ut32 *)(regset->arena->bytes + off + 8));
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} else {
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eprintf ("r_reg_get_value: null or oob arena for current regset\n");
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}
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ret = val->v96.Low;
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break;
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case 128: // qword + qword
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if (regset->arena->bytes && (off + 16 <= regset->arena->size)) {
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val->v128.Low = *((ut64 *)(regset->arena->bytes + off));
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val->v128.High = *((ut64 *)(regset->arena->bytes + off + 8));
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} else {
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eprintf ("r_reg_get_value: null or oob arena for current regset\n");
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}
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ret = val->v128.Low;
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break;
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//case 256:// qword + qword + qword + qword
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// break;
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default:
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eprintf ("r_reg_get_value_big: Bit size %d not supported\n", item->size);
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break;
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}
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return ret;
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}
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R_API ut64 r_reg_get_value(RReg *reg, RRegItem *item) {
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if (!reg || !item || item->offset == -1) {
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return 0LL;
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}
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int off = BITS2BYTES (item->offset);
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RRegSet *regset = ®->regset[item->arena];
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switch (item->size) {
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case 1: {
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int offset = item->offset / 8;
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if (offset + item->size >= regset->arena->size) {
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break;
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}
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return (regset->arena->bytes[offset] &
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(1 << (item->offset % 8)))
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? 1
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: 0;
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} break;
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case 4:
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if (regset->arena->size - off - 1 >= 0) {
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return (r_read_at_ble8 (regset->arena->bytes, off)) & 0xF;
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}
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break;
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case 8:
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if (regset->arena->size - off - 1 >= 0) {
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return r_read_at_ble8 (regset->arena->bytes, off);
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}
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break;
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case 16:
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if (regset->arena->size - off - 2 >= 0) {
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return r_read_ble16 (regset->arena->bytes + off, reg->big_endian);
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}
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break;
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case 27:
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if (off + 3 < regset->arena->size) {
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return r_read_me27 (regset->arena->bytes + off, 0);
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}
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break;
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case 32:
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if (off + 4 <= regset->arena->size) {
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return r_read_ble32 (regset->arena->bytes + off, reg->big_endian);
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}
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eprintf ("r_reg_get_value: 32bit oob read %d\n", off);
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break;
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case 64:
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if (regset->arena && regset->arena->bytes && (off + 8 <= regset->arena->size)) {
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return r_read_ble64 (regset->arena->bytes + off, reg->big_endian);
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}
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//eprintf ("r_reg_get_value: null or oob arena for current regset\n");
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break;
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case 80: // long double
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case 96: // long floating value
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// FIXME: It is a precision loss, please implement me properly!
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return (ut64)r_reg_get_longdouble (reg, item);
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default:
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eprintf ("r_reg_get_value: Bit size %d not supported\n", item->size);
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break;
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}
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return 0LL;
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}
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R_API ut64 r_reg_get_value_by_role(RReg *reg, RRegisterId role) {
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// TODO use mapping from RRegisterId to RRegItem (via RRegSet)
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return r_reg_get_value (reg, r_reg_get (reg, r_reg_get_name (reg, role), -1));
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}
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R_API bool r_reg_set_value(RReg *reg, RRegItem *item, ut64 value) {
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int fits_in_arena;
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ut8 bytes[12];
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ut8 *src = bytes;
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r_return_val_if_fail (reg && item, false);
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if (r_reg_is_readonly (reg, item)) {
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return true;
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}
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switch (item->size) {
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case 80:
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case 96: // long floating value
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r_reg_set_longdouble (reg, item, (long double)value);
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break;
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case 64:
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if (reg->big_endian) {
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r_write_be64 (src, value);
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} else {
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r_write_le64 (src, value);
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}
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break;
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case 32:
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if (reg->big_endian) {
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r_write_be32 (src, value);
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} else {
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r_write_le32 (src, value);
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}
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break;
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case 16:
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if (reg->big_endian) {
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r_write_be16 (src, value);
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} else {
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r_write_le16 (src, value);
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}
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break;
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case 8:
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r_write_ble8 (src, (ut8) (value & UT8_MAX));
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break;
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case 1:
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if (value) {
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ut8 *buf = reg->regset[item->arena].arena->bytes + (item->offset / 8);
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int bit = (item->offset % 8);
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ut8 mask = (1 << bit);
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buf[0] = (buf[0] & (0xff ^ mask)) | mask;
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} else {
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int idx = item->offset / 8;
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RRegArena *arena = reg->regset[item->arena].arena;
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if (idx + item->size > arena->size) {
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eprintf ("RRegSetOverflow %d vs %d\n", idx + item->size, arena->size);
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return false;
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}
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ut8 *buf = arena->bytes + idx;
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int bit = item->offset % 8;
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ut8 mask = 0xff ^ (1 << bit);
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buf[0] = (buf[0] & mask) | 0;
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}
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return true;
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default:
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eprintf ("r_reg_set_value: Bit size %d not supported\n", item->size);
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return false;
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}
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fits_in_arena = (reg->regset[item->arena].arena->size - BITS2BYTES (item->offset) - BITS2BYTES (item->size)) >= 0;
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if (src && fits_in_arena) {
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r_mem_copybits (reg->regset[item->arena].arena->bytes +
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BITS2BYTES (item->offset),
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src, item->size);
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return true;
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}
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eprintf ("r_reg_set_value: Cannot set %s to 0x%" PFMT64x "\n", item->name, value);
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return false;
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}
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R_API bool r_reg_set_value_by_role(RReg *reg, RRegisterId role, ut64 val) {
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// TODO use mapping from RRegisterId to RRegItem (via RRegSet)
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RRegItem *r = r_reg_get (reg, r_reg_get_name (reg, role), -1);
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return r_reg_set_value (reg, r, val);
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}
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R_API ut64 r_reg_set_bvalue(RReg *reg, RRegItem *item, const char *str) {
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ut64 num = UT64_MAX;
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if (item && item->flags && str) {
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num = r_str_bits_from_string (str, item->flags);
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if (num == UT64_MAX) {
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num = r_num_math (NULL, str);
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}
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r_reg_set_value (reg, item, num);
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}
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return num;
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}
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R_API R_HEAP char *r_reg_get_bvalue(RReg *reg, RRegItem *item) {
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char *out = NULL;
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if (reg && item && item->flags) {
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out = malloc (strlen (item->flags) + 1);
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if (out) {
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ut64 num = r_reg_get_value (reg, item);
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r_str_bits (out, (ut8 *)&num,
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strlen (item->flags) * 8, item->flags);
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}
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}
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return out;
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}
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/* packed registers */
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// packbits can be 8, 16, 32 or 64
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// result value is always casted into ut64
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// TODO: use item->packed_size
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R_API ut64 r_reg_get_pack(RReg *reg, RRegItem *item, int packidx, int packbits) {
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ut64 ret = 0LL;
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if (!reg || !item) {
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return 0LL;
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}
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if (packbits < 1) {
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packbits = item->packed_size;
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}
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const int packbytes = packbits / 8;
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const int packmod = packbits % 8;
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if (packmod) {
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eprintf ("Invalid bit size for packet register\n");
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return 0LL;
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}
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int off = BITS2BYTES (item->offset);
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RRegSet *regset = ®->regset[item->arena];
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off += (packidx * packbytes);
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if (regset->arena->size - off - 1 >= 0) {
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memcpy (&ret, regset->arena->bytes + off, packbytes);
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}
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return ret;
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}
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R_API int r_reg_set_pack(RReg *reg, RRegItem *item, int packidx, int packbits, ut64 val) {
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int packbytes, packmod;
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if (!reg || !item) {
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eprintf ("r_reg_set_value: item is NULL\n");
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return false;
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}
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if (packbits < 1) {
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packbits = item->packed_size;
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}
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packbytes = packbits / 8;
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packmod = packbits % 8;
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if (packidx * packbits > item->size) {
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eprintf ("Packed index is beyond the register size\n");
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return false;
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}
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if (packmod) {
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eprintf ("Invalid bit size for packet register\n");
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return false;
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}
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int off = item->offset;
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if (reg->regset[item->arena].arena->size - BITS2BYTES (off) - BITS2BYTES (packbytes) >= 0) {
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ut8 *dst = reg->regset[item->arena].arena->bytes + BITS2BYTES (off);
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r_mem_copybits (dst, (ut8 *)&val, packbytes);
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return true;
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}
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eprintf ("r_reg_set_value: Cannot set %s to 0x%" PFMT64x "\n", item->name, val);
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return false;
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}
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