Implement LDR/STR decode

1 files changed, 32 insertions, 0 deletions

diff --git a/rtl/core/decode/ldst/multiple.sv b/rtl/core/decode/ldst/multiple.sv
new file mode 100644
index 0000000..24e8e5b
--- /dev/null
+++ b/rtl/core/decode/ldst/multiple.sv
@@ -0,0 +1,32 @@
+`include "core/isa.sv"
+`include "core/uarch.sv"
+
+module core_decode_ldst_multiple
+(
+	input  word        insn,
+
+	output ldst_decode decode,
+	output logic       restore_spsr
+);
+
+	logic s, l;
+	logic[15:0] reg_list;
+
+	assign decode.rn = insn `FIELD_LDST_MULT_RN;
+	assign decode.size = LDST_WORD;
+	assign decode.load = l;
+	assign decode.increment = insn `FIELD_LDST_MULT_U;
+	assign decode.writeback = insn `FIELD_LDST_MULT_W;
+	assign decode.sign_extend = 0;
+	assign decode.pre_indexed = insn `FIELD_LDST_MULT_P;
+	assign decode.unprivileged = 0;
+	assign decode.user_regs = s && (!l || !reg_list[`R15]);
+	assign decode.reg_list = reg_list;
+
+	assign s = insn `FIELD_LDST_MULT_S;
+	assign l = insn `FIELD_LDST_LD;
+
+	assign reg_list = insn `FIELD_LDST_MULT_LIST;
+	assign restore_spsr = s && l && reg_list[`R15];
+
+endmodule