@@ -8872,6 +8872,318 @@ DO_LDST(STRH, store, MO_UW)
#undef DO_LDST
+/*
+ * Synchronization primitives
+ */
+
+static bool op_swp(DisasContext *s, arg_SWP *a, MemOp opc)
+{
+ TCGv_i32 addr, tmp;
+ TCGv taddr;
+
+ opc |= s->be_data;
+ addr = load_reg(s, a->rn);
+ taddr = gen_aa32_addr(s, addr, opc);
+ tcg_temp_free_i32(addr);
+
+ tmp = load_reg(s, a->rt2);
+ tcg_gen_atomic_xchg_i32(tmp, taddr, tmp, get_mem_index(s), opc);
+ tcg_temp_free(taddr);
+
+ store_reg(s, a->rt, tmp);
+ return true;
+}
+
+static bool trans_SWP(DisasContext *s, arg_SWP *a)
+{
+ return op_swp(s, a, MO_UL | MO_ALIGN);
+}
+
+static bool trans_SWPB(DisasContext *s, arg_SWP *a)
+{
+ return op_swp(s, a, MO_UB);
+}
+
+/*
+ * Load/Store Exclusive and Load-Acquire/Store-Release
+ */
+
+static bool op_strex(DisasContext *s, arg_STREX *a, MemOp mop, bool rel)
+{
+ TCGv_i32 addr;
+
+ if (rel) {
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
+ }
+
+ addr = tcg_temp_local_new_i32();
+ load_reg_var(s, addr, a->rn);
+ tcg_gen_addi_i32(addr, addr, a->imm);
+
+ gen_store_exclusive(s, a->rd, a->rt, a->rt2, addr, mop);
+ tcg_temp_free_i32(addr);
+ return true;
+}
+
+static bool trans_STREX(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_6) {
+ return false;
+ }
+ return op_strex(s, a, MO_32, false);
+}
+
+static bool trans_STREXD_a32(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_6K) {
+ return false;
+ }
+ if (a->rt & 1) {
+ unallocated_encoding(s);
+ return true;
+ }
+ a->rt2 = a->rt + 1;
+ return op_strex(s, a, MO_64, false);
+}
+
+static bool trans_STREXD_t32(DisasContext *s, arg_STREX *a)
+{
+ return op_strex(s, a, MO_64, false);
+}
+
+static bool trans_STREXB(DisasContext *s, arg_STREX *a)
+{
+ if (s->thumb ? !ENABLE_ARCH_7 : !ENABLE_ARCH_6K) {
+ return false;
+ }
+ return op_strex(s, a, MO_8, false);
+}
+
+static bool trans_STREXH(DisasContext *s, arg_STREX *a)
+{
+ if (s->thumb ? !ENABLE_ARCH_7 : !ENABLE_ARCH_6K) {
+ return false;
+ }
+ return op_strex(s, a, MO_16, false);
+}
+
+static bool trans_STLEX(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_strex(s, a, MO_32, true);
+}
+
+static bool trans_STLEXD_a32(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ if (a->rt & 1) {
+ unallocated_encoding(s);
+ return true;
+ }
+ a->rt2 = a->rt + 1;
+ return op_strex(s, a, MO_64, true);
+}
+
+static bool trans_STLEXD_t32(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_strex(s, a, MO_64, true);
+}
+
+static bool trans_STLEXB(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_strex(s, a, MO_8, true);
+}
+
+static bool trans_STLEXH(DisasContext *s, arg_STREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_strex(s, a, MO_16, true);
+}
+
+static bool op_stl(DisasContext *s, arg_STL *a, MemOp mop)
+{
+ TCGv_i32 addr, tmp;
+
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ addr = load_reg(s, a->rn);
+
+ tmp = load_reg(s, a->rt);
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
+ gen_aa32_st_i32(s, tmp, addr, get_mem_index(s), mop | s->be_data);
+ disas_set_da_iss(s, mop, a->rt | ISSIsAcqRel | ISSIsWrite);
+
+ tcg_temp_free_i32(tmp);
+ tcg_temp_free_i32(addr);
+ return true;
+}
+
+static bool trans_STL(DisasContext *s, arg_STL *a)
+{
+ return op_stl(s, a, MO_UL);
+}
+
+static bool trans_STLB(DisasContext *s, arg_STL *a)
+{
+ return op_stl(s, a, MO_UB);
+}
+
+static bool trans_STLH(DisasContext *s, arg_STL *a)
+{
+ return op_stl(s, a, MO_UW);
+}
+
+static bool op_ldrex(DisasContext *s, arg_LDREX *a, MemOp mop, bool acq)
+{
+ TCGv_i32 addr;
+
+ addr = tcg_temp_local_new_i32();
+ load_reg_var(s, addr, a->rn);
+ tcg_gen_addi_i32(addr, addr, a->imm);
+
+ gen_load_exclusive(s, a->rt, a->rt2, addr, mop);
+ tcg_temp_free_i32(addr);
+
+ if (acq) {
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
+ }
+ return true;
+}
+
+static bool trans_LDREX(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_6) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_32, false);
+}
+
+static bool trans_LDREXD_a32(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_6K) {
+ return false;
+ }
+ if (a->rt & 1) {
+ unallocated_encoding(s);
+ return true;
+ }
+ a->rt2 = a->rt + 1;
+ return op_ldrex(s, a, MO_64, false);
+}
+
+static bool trans_LDREXD_t32(DisasContext *s, arg_LDREX *a)
+{
+ return op_ldrex(s, a, MO_64, false);
+}
+
+static bool trans_LDREXB(DisasContext *s, arg_LDREX *a)
+{
+ if (s->thumb ? !ENABLE_ARCH_7 : !ENABLE_ARCH_6K) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_8, false);
+}
+
+static bool trans_LDREXH(DisasContext *s, arg_LDREX *a)
+{
+ if (s->thumb ? !ENABLE_ARCH_7 : !ENABLE_ARCH_6K) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_16, false);
+}
+
+static bool trans_LDAEX(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_32, true);
+}
+
+static bool trans_LDAEXD_a32(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ if (a->rt & 1) {
+ unallocated_encoding(s);
+ return true;
+ }
+ a->rt2 = a->rt + 1;
+ return op_ldrex(s, a, MO_64, true);
+}
+
+static bool trans_LDAEXD_t32(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_64, true);
+}
+
+static bool trans_LDAEXB(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_8, true);
+}
+
+static bool trans_LDAEXH(DisasContext *s, arg_LDREX *a)
+{
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ return op_ldrex(s, a, MO_16, true);
+}
+
+static bool op_lda(DisasContext *s, arg_LDA *a, MemOp mop)
+{
+ TCGv_i32 addr, tmp;
+
+ if (!ENABLE_ARCH_8) {
+ return false;
+ }
+ addr = load_reg(s, a->rn);
+
+ tmp = tcg_temp_new_i32();
+ gen_aa32_ld_i32(s, tmp, addr, get_mem_index(s), mop | s->be_data);
+ disas_set_da_iss(s, mop, a->rt | ISSIsAcqRel);
+ tcg_temp_free_i32(addr);
+
+ store_reg(s, a->rt, tmp);
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
+ return true;
+}
+
+static bool trans_LDA(DisasContext *s, arg_LDA *a)
+{
+ return op_lda(s, a, MO_UL);
+}
+
+static bool trans_LDAB(DisasContext *s, arg_LDA *a)
+{
+ return op_lda(s, a, MO_UB);
+}
+
+static bool trans_LDAH(DisasContext *s, arg_LDA *a)
+{
+ return op_lda(s, a, MO_UW);
+}
+
/*
* Legacy decoder.
*/
@@ -9167,172 +9479,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
case 0x0:
case 0x1:
/* multiplies, extra load/stores */
- sh = (insn >> 5) & 3;
- if (sh == 0) {
- if (op1 == 0x0) {
- /* Multiply and multiply accumulate. */
- /* All done in decodetree. Reach here for illegal ops. */
- goto illegal_op;
- } else {
- rn = (insn >> 16) & 0xf;
- rd = (insn >> 12) & 0xf;
- if (insn & (1 << 23)) {
- /* load/store exclusive */
- bool is_ld = extract32(insn, 20, 1);
- bool is_lasr = !extract32(insn, 8, 1);
- int op2 = (insn >> 8) & 3;
- op1 = (insn >> 21) & 0x3;
-
- switch (op2) {
- case 0: /* lda/stl */
- if (op1 == 1) {
- goto illegal_op;
- }
- ARCH(8);
- break;
- case 1: /* reserved */
- goto illegal_op;
- case 2: /* ldaex/stlex */
- ARCH(8);
- break;
- case 3: /* ldrex/strex */
- if (op1) {
- ARCH(6K);
- } else {
- ARCH(6);
- }
- break;
- }
-
- addr = tcg_temp_local_new_i32();
- load_reg_var(s, addr, rn);
-
- if (is_lasr && !is_ld) {
- tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
- }
-
- if (op2 == 0) {
- if (is_ld) {
- tmp = tcg_temp_new_i32();
- switch (op1) {
- case 0: /* lda */
- gen_aa32_ld32u_iss(s, tmp, addr,
- get_mem_index(s),
- rd | ISSIsAcqRel);
- break;
- case 2: /* ldab */
- gen_aa32_ld8u_iss(s, tmp, addr,
- get_mem_index(s),
- rd | ISSIsAcqRel);
- break;
- case 3: /* ldah */
- gen_aa32_ld16u_iss(s, tmp, addr,
- get_mem_index(s),
- rd | ISSIsAcqRel);
- break;
- default:
- abort();
- }
- store_reg(s, rd, tmp);
- } else {
- rm = insn & 0xf;
- tmp = load_reg(s, rm);
- switch (op1) {
- case 0: /* stl */
- gen_aa32_st32_iss(s, tmp, addr,
- get_mem_index(s),
- rm | ISSIsAcqRel);
- break;
- case 2: /* stlb */
- gen_aa32_st8_iss(s, tmp, addr,
- get_mem_index(s),
- rm | ISSIsAcqRel);
- break;
- case 3: /* stlh */
- gen_aa32_st16_iss(s, tmp, addr,
- get_mem_index(s),
- rm | ISSIsAcqRel);
- break;
- default:
- abort();
- }
- tcg_temp_free_i32(tmp);
- }
- } else if (is_ld) {
- switch (op1) {
- case 0: /* ldrex */
- gen_load_exclusive(s, rd, 15, addr, 2);
- break;
- case 1: /* ldrexd */
- gen_load_exclusive(s, rd, rd + 1, addr, 3);
- break;
- case 2: /* ldrexb */
- gen_load_exclusive(s, rd, 15, addr, 0);
- break;
- case 3: /* ldrexh */
- gen_load_exclusive(s, rd, 15, addr, 1);
- break;
- default:
- abort();
- }
- } else {
- rm = insn & 0xf;
- switch (op1) {
- case 0: /* strex */
- gen_store_exclusive(s, rd, rm, 15, addr, 2);
- break;
- case 1: /* strexd */
- gen_store_exclusive(s, rd, rm, rm + 1, addr, 3);
- break;
- case 2: /* strexb */
- gen_store_exclusive(s, rd, rm, 15, addr, 0);
- break;
- case 3: /* strexh */
- gen_store_exclusive(s, rd, rm, 15, addr, 1);
- break;
- default:
- abort();
- }
- }
- tcg_temp_free_i32(addr);
-
- if (is_lasr && is_ld) {
- tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
- }
- } else if ((insn & 0x00300f00) == 0) {
- /* 0bcccc_0001_0x00_xxxx_xxxx_0000_1001_xxxx
- * - SWP, SWPB
- */
-
- TCGv taddr;
- MemOp opc = s->be_data;
-
- rm = (insn) & 0xf;
-
- if (insn & (1 << 22)) {
- opc |= MO_UB;
- } else {
- opc |= MO_UL | MO_ALIGN;
- }
-
- addr = load_reg(s, rn);
- taddr = gen_aa32_addr(s, addr, opc);
- tcg_temp_free_i32(addr);
-
- tmp = load_reg(s, rm);
- tcg_gen_atomic_xchg_i32(tmp, taddr, tmp,
- get_mem_index(s), opc);
- tcg_temp_free(taddr);
- store_reg(s, rd, tmp);
- } else {
- goto illegal_op;
- }
- }
- } else {
- /* Extra load/store (register) instructions */
- /* All done in decodetree. Reach here for illegal ops. */
- goto illegal_op;
- }
+ /* All done in decodetree. Reach here for illegal ops. */
+ goto illegal_op;
break;
case 0x4:
case 0x5:
@@ -9987,15 +10135,8 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
}
goto illegal_op;
}
- addr = tcg_temp_local_new_i32();
- load_reg_var(s, addr, rn);
- tcg_gen_addi_i32(addr, addr, (insn & 0xff) << 2);
- if (insn & (1 << 20)) {
- gen_load_exclusive(s, rs, 15, addr, 2);
- } else {
- gen_store_exclusive(s, rd, rs, 15, addr, 2);
- }
- tcg_temp_free_i32(addr);
+ /* Load/store exclusive, in decodetree */
+ goto illegal_op;
} else if ((insn & (7 << 5)) == 0) {
/* Table Branch. */
addr = load_reg(s, rn);
@@ -10017,89 +10158,8 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
tcg_gen_addi_i32(tmp, tmp, read_pc(s));
store_reg(s, 15, tmp);
} else {
- bool is_lasr = false;
- bool is_ld = extract32(insn, 20, 1);
- int op2 = (insn >> 6) & 0x3;
- op = (insn >> 4) & 0x3;
- switch (op2) {
- case 0:
- goto illegal_op;
- case 1:
- /* Load/store exclusive byte/halfword/doubleword */
- if (op == 2) {
- goto illegal_op;
- }
- ARCH(7);
- break;
- case 2:
- /* Load-acquire/store-release */
- if (op == 3) {
- goto illegal_op;
- }
- /* Fall through */
- case 3:
- /* Load-acquire/store-release exclusive */
- ARCH(8);
- is_lasr = true;
- break;
- }
-
- if (is_lasr && !is_ld) {
- tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
- }
-
- addr = tcg_temp_local_new_i32();
- load_reg_var(s, addr, rn);
- if (!(op2 & 1)) {
- if (is_ld) {
- tmp = tcg_temp_new_i32();
- switch (op) {
- case 0: /* ldab */
- gen_aa32_ld8u_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- case 1: /* ldah */
- gen_aa32_ld16u_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- case 2: /* lda */
- gen_aa32_ld32u_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- default:
- abort();
- }
- store_reg(s, rs, tmp);
- } else {
- tmp = load_reg(s, rs);
- switch (op) {
- case 0: /* stlb */
- gen_aa32_st8_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- case 1: /* stlh */
- gen_aa32_st16_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- case 2: /* stl */
- gen_aa32_st32_iss(s, tmp, addr, get_mem_index(s),
- rs | ISSIsAcqRel);
- break;
- default:
- abort();
- }
- tcg_temp_free_i32(tmp);
- }
- } else if (is_ld) {
- gen_load_exclusive(s, rs, rd, addr, op);
- } else {
- gen_store_exclusive(s, rm, rs, rd, addr, op);
- }
- tcg_temp_free_i32(addr);
-
- if (is_lasr && is_ld) {
- tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
- }
+ /* Load/store exclusive, load-acq/store-rel, in decodetree */
+ goto illegal_op;
}
} else {
/* Load/store multiple, RFE, SRS. */
@@ -39,6 +39,8 @@
&mrs_bank rd r sysm
&ldst_rr p w u rn rt rm shimm shtype
&ldst_ri p w u rn rt imm
+&strex rn rd rt rt2 imm
+&ldrex rn rt rt2 imm
# Data-processing (register)
@@ -342,3 +344,49 @@ STRT_ri .... 010. .0.0 .... .... ............ @ldst_ri12_p0w1
STRBT_ri .... 010. .1.0 .... .... ............ @ldst_ri12_p0w1
LDRT_ri .... 010. .0.1 .... .... ............ @ldst_ri12_p0w1
LDRBT_ri .... 010. .1.1 .... .... ............ @ldst_ri12_p0w1
+
+# Synchronization primitives
+
+@swp ---- .... .... rn:4 rt:4 .... .... rt2:4
+
+SWP .... 0001 0000 .... .... 0000 1001 .... @swp
+SWPB .... 0001 0100 .... .... 0000 1001 .... @swp
+
+# Load/Store Exclusive and Load-Acquire/Store-Release
+#
+# Note rt2 for STREXD/LDREXD is set by the helper after checking rt is even.
+
+@strex ---- .... .... rn:4 rd:4 .... .... rt:4 \
+ &strex imm=0 rt2=15
+@ldrex ---- .... .... rn:4 rt:4 .... .... .... \
+ &ldrex imm=0 rt2=15
+@stl ---- .... .... rn:4 .... .... .... rt:4 \
+ &ldrex imm=0 rt2=15
+
+STREX .... 0001 1000 .... .... 1111 1001 .... @strex
+STREXD_a32 .... 0001 1010 .... .... 1111 1001 .... @strex
+STREXB .... 0001 1100 .... .... 1111 1001 .... @strex
+STREXH .... 0001 1110 .... .... 1111 1001 .... @strex
+
+STLEX .... 0001 1000 .... .... 1110 1001 .... @strex
+STLEXD_a32 .... 0001 1010 .... .... 1110 1001 .... @strex
+STLEXB .... 0001 1100 .... .... 1110 1001 .... @strex
+STLEXH .... 0001 1110 .... .... 1110 1001 .... @strex
+
+STL .... 0001 1000 .... 1111 1100 1001 .... @stl
+STLB .... 0001 1100 .... 1111 1100 1001 .... @stl
+STLH .... 0001 1110 .... 1111 1100 1001 .... @stl
+
+LDREX .... 0001 1001 .... .... 1111 1001 1111 @ldrex
+LDREXD_a32 .... 0001 1011 .... .... 1111 1001 1111 @ldrex
+LDREXB .... 0001 1101 .... .... 1111 1001 1111 @ldrex
+LDREXH .... 0001 1111 .... .... 1111 1001 1111 @ldrex
+
+LDAEX .... 0001 1001 .... .... 1110 1001 1111 @ldrex
+LDAEXD_a32 .... 0001 1011 .... .... 1110 1001 1111 @ldrex
+LDAEXB .... 0001 1101 .... .... 1110 1001 1111 @ldrex
+LDAEXH .... 0001 1111 .... .... 1110 1001 1111 @ldrex
+
+LDA .... 0001 1001 .... .... 1100 1001 1111 @ldrex
+LDAB .... 0001 1101 .... .... 1100 1001 1111 @ldrex
+LDAH .... 0001 1111 .... .... 1100 1001 1111 @ldrex
@@ -36,6 +36,8 @@
&mrs_bank !extern rd r sysm
&ldst_rr !extern p w u rn rt rm shimm shtype
&ldst_ri !extern p w u rn rt imm
+&strex !extern rn rd rt rt2 imm
+&ldrex !extern rn rt rt2 imm
# Data-processing (register)
@@ -392,3 +394,47 @@ LDRD_ri_t32 1110 1001 .101 .... .... .... ........ @ldstd_ri8 w=0 p=1
STRD_ri_t32 1110 1001 .110 .... .... .... ........ @ldstd_ri8 w=1 p=1
LDRD_ri_t32 1110 1001 .111 .... .... .... ........ @ldstd_ri8 w=1 p=1
+
+# Load/Store Exclusive and Load-Acquire/Store-Release
+
+@strex_i .... .... .... rn:4 rt:4 rd:4 .... .... \
+ &strex rt2=15 imm=%imm8x4
+@strex_0 .... .... .... rn:4 rt:4 .... .... rd:4 \
+ &strex rt2=15 imm=0
+@strex_d .... .... .... rn:4 rt:4 rt2:4 .... rd:4 \
+ &strex imm=0
+
+@ldrex_i .... .... .... rn:4 rt:4 .... .... .... \
+ &ldrex rt2=15 imm=%imm8x4
+@ldrex_0 .... .... .... rn:4 rt:4 .... .... .... \
+ &ldrex rt2=15 imm=0
+@ldrex_d .... .... .... rn:4 rt:4 rt2:4 .... .... \
+ &ldrex imm=0
+
+STREX 1110 1000 0100 .... .... .... .... .... @strex_i
+STREXB 1110 1000 1100 .... .... 1111 0100 .... @strex_0
+STREXH 1110 1000 1100 .... .... 1111 0101 .... @strex_0
+STREXD_t32 1110 1000 1100 .... .... .... 0111 .... @strex_d
+
+STLEX 1110 1000 1100 .... .... 1111 1110 .... @strex_0
+STLEXB 1110 1000 1100 .... .... 1111 1100 .... @strex_0
+STLEXH 1110 1000 1100 .... .... 1111 1101 .... @strex_0
+STLEXD_t32 1110 1000 1100 .... .... .... 1111 .... @strex_d
+
+STL 1110 1000 1100 .... .... 1111 1010 1111 @ldrex_0
+STLB 1110 1000 1100 .... .... 1111 1000 1111 @ldrex_0
+STLH 1110 1000 1100 .... .... 1111 1001 1111 @ldrex_0
+
+LDREX 1110 1000 0101 .... .... 1111 .... .... @ldrex_i
+LDREXB 1110 1000 1101 .... .... 1111 0100 1111 @ldrex_0
+LDREXH 1110 1000 1101 .... .... 1111 0101 1111 @ldrex_0
+LDREXD_t32 1110 1000 1101 .... .... .... 0111 1111 @ldrex_d
+
+LDAEX 1110 1000 1101 .... .... 1111 1110 1111 @ldrex_0
+LDAEXB 1110 1000 1101 .... .... 1111 1100 1111 @ldrex_0
+LDAEXH 1110 1000 1101 .... .... 1111 1101 1111 @ldrex_0
+LDAEXD_t32 1110 1000 1101 .... .... .... 1111 1111 @ldrex_d
+
+LDA 1110 1000 1101 .... .... 1111 1010 1111 @ldrex_0
+LDAB 1110 1000 1101 .... .... 1111 1000 1111 @ldrex_0
+LDAH 1110 1000 1101 .... .... 1111 1001 1111 @ldrex_0