Implement LDR/STR decode

1 files changed, 30 insertions, 0 deletions

diff --git a/rtl/core/decode/ldst/single.sv b/rtl/core/decode/ldst/single.sv
new file mode 100644
index 0000000..5bcb638
--- /dev/null
+++ b/rtl/core/decode/ldst/single.sv
@@ -0,0 +1,30 @@
+`include "core/isa.sv"
+`include "core/uarch.sv"
+
+module core_decode_ldst_single
+(
+	input  word        insn,
+
+	output ldst_decode decode,
+	output logic       snd_is_imm
+);
+
+	logic p, w;
+
+	assign decode.rn = insn `FIELD_LDST_SINGLE_RN;
+	assign decode.rd = insn `FIELD_LDST_SINGLE_RD;
+	assign decode.size = insn `FIELD_LDST_SINGLE_B ? LDST_BYTE : LDST_WORD;
+	assign decode.load = insn `FIELD_LDST_LD;
+	assign decode.increment = insn `FIELD_LDST_SINGLE_U;
+	assign decode.writeback = !p || w;
+	assign decode.sign_extend = 0;
+	assign decode.pre_indexed = p && w;
+	assign decode.unprivileged = !p && w;
+	assign decode.user_regs = 0;
+	assign decode.reg_list = 16'b0;
+
+	assign p = insn `FIELD_LDST_SINGLE_P;
+	assign w = insn `FIELD_LDST_SINGLE_W;
+	assign snd_is_imm = !insn `FIELD_LDST_SINGLE_REG;
+
+endmodule