+static unsigned imm_size(struct decode_cache *c)
+{
+ unsigned size;
+
+ size = (c->d & ByteOp) ? 1 : c->op_bytes;
+ if (size == 8)
+ size = 4;
+ return size;
+}
+
+static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
+ unsigned size, bool sign_extension)
+{
+ struct decode_cache *c = &ctxt->decode;
+ struct x86_emulate_ops *ops = ctxt->ops;
+ int rc = X86EMUL_CONTINUE;
+
+ op->type = OP_IMM;
+ op->bytes = size;
+ op->addr.mem = c->eip;
+ /* NB. Immediates are sign-extended as necessary. */
+ switch (op->bytes) {
+ case 1:
+ op->val = insn_fetch(s8, 1, c->eip);
+ break;
+ case 2:
+ op->val = insn_fetch(s16, 2, c->eip);
+ break;
+ case 4:
+ op->val = insn_fetch(s32, 4, c->eip);
+ break;
+ }
+ if (!sign_extension) {
+ switch (op->bytes) {
+ case 1:
+ op->val &= 0xff;
+ break;
+ case 2:
+ op->val &= 0xffff;
+ break;
+ case 4:
+ op->val &= 0xffffffff;
+ break;
+ }
+ }
+done:
+ return rc;
+}
+