From fbe3ab39675d338eb6d5388b7deacf98a3a8ae2d Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Mon, 2 Oct 2023 11:15:34 -0600
Subject: rtl/core: implement ldrex/strex decode

---
 rtl/core/decode/ldst/exclusive.sv | 27 +++++++++++++++++++++++++++
 rtl/core/decode/ldst/misc.sv      |  1 +
 rtl/core/decode/ldst/multiple.sv  |  1 +
 rtl/core/decode/ldst/single.sv    |  1 +
 4 files changed, 30 insertions(+)
 create mode 100644 rtl/core/decode/ldst/exclusive.sv

(limited to 'rtl/core/decode/ldst')

diff --git a/rtl/core/decode/ldst/exclusive.sv b/rtl/core/decode/ldst/exclusive.sv
new file mode 100644
index 0000000..7942a04
--- /dev/null
+++ b/rtl/core/decode/ldst/exclusive.sv
@@ -0,0 +1,27 @@
+`include "core/decode/isa.sv"
+`include "core/uarch.sv"
+
+module core_decode_ldst_exclusive
+(
+	input  word        insn,
+
+	output ldst_decode decode,
+	output reg_num     snd_r
+);
+
+	assign snd_r = insn `FIELD_LDST_EX_R_OK;
+
+	assign decode.rn = insn `FIELD_LDST_EX_RN;
+	assign decode.rd = insn `FIELD_LDST_EX_RD;
+	assign decode.size = LDST_WORD;
+	assign decode.load = insn `FIELD_LDST_EX_LD;
+	assign decode.increment = 0;
+	assign decode.writeback = 0;
+	assign decode.exclusive = 1;
+	assign decode.sign_extend = 0;
+	assign decode.pre_indexed = 0;
+	assign decode.unprivileged = 0;
+	assign decode.user_regs = 0;
+	assign decode.regs = 16'b0;
+
+endmodule
diff --git a/rtl/core/decode/ldst/misc.sv b/rtl/core/decode/ldst/misc.sv
index 4e4a17e..72d648c 100644
--- a/rtl/core/decode/ldst/misc.sv
+++ b/rtl/core/decode/ldst/misc.sv
@@ -19,6 +19,7 @@ module core_decode_ldst_misc
 	assign decode.load = insn `FIELD_LDST_LD;
 	assign decode.increment = insn `FIELD_LDST_MISC_U;
 	assign decode.writeback = !p || w;
+	assign decode.exclusive = 0;
 	assign decode.sign_extend = insn `FIELD_LDST_MISC_S;
 	assign decode.pre_indexed = p;
 	assign decode.unprivileged = 0;
diff --git a/rtl/core/decode/ldst/multiple.sv b/rtl/core/decode/ldst/multiple.sv
index 0ecd674..c822ab0 100644
--- a/rtl/core/decode/ldst/multiple.sv
+++ b/rtl/core/decode/ldst/multiple.sv
@@ -18,6 +18,7 @@ module core_decode_ldst_multiple
 	assign decode.load = l;
 	assign decode.increment = insn `FIELD_LDST_MULT_U;
 	assign decode.writeback = insn `FIELD_LDST_MULT_W;
+	assign decode.exclusive = 0;
 	assign decode.sign_extend = 0;
 	assign decode.pre_indexed = insn `FIELD_LDST_MULT_P;
 	assign decode.unprivileged = 0;
diff --git a/rtl/core/decode/ldst/single.sv b/rtl/core/decode/ldst/single.sv
index 402c17b..af096a7 100644
--- a/rtl/core/decode/ldst/single.sv
+++ b/rtl/core/decode/ldst/single.sv
@@ -17,6 +17,7 @@ module core_decode_ldst_single
 	assign decode.load = insn `FIELD_LDST_LD;
 	assign decode.increment = insn `FIELD_LDST_SINGLE_U;
 	assign decode.writeback = !p || w;
+	assign decode.exclusive = 0;
 	assign decode.sign_extend = 0;
 	assign decode.pre_indexed = p;
 	assign decode.unprivileged = !p && w;
-- 
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