add ability to make non-aligned loads/stores and loads/stores of 1 or 2 bytes together with test bench

4 files changed, 146 insertions, 0 deletions

diff --git a/tests/stack_machine_unaligned/Makefile b/tests/stack_machine_unaligned/Makefile
new file mode 120000
index 0000000..2c3c770
--- /dev/null
+++ b/tests/stack_machine_unaligned/Makefile
@@ -0,0 +1 @@
+../stack_machine_store/Makefile
\ No newline at end of file
diff --git a/tests/stack_machine_unaligned/instructions.s.tcl b/tests/stack_machine_unaligned/instructions.s.tcl
new file mode 100644
index 0000000..9f2a0a8
--- /dev/null
+++ b/tests/stack_machine_unaligned/instructions.s.tcl
@@ -0,0 +1,125 @@
+### make memory reads and writes of bytes, words and dwords at both
+### aligned and unaligned locations
+
+## set up stack
+set_sp 0
+
+## store value h9A785634 at h100 writing 1 byte at a time
+
+# write first 2 bytes using storeb
+const h34
+storeb h000100
+
+# try putting some garbage in higher 3 bytes of our constant - it should
+# not get written anyway
+const h9ABA9E56
+storeb h000101
+
+# write another 2 bytes using storeb+
+const 2
+const h78
+storeb+ h100
+
+const 3
+const h9A
+storeb+ h100
+
+
+## test single-byte loads
+
+# sign-extend read value h9A (as hFFFFFF9A) and store it at h104
+loadbsx h00103
+store h00104
+
+# sign-extend read value h78 (as h00000078) and store it at h108
+const 2
+loadbsx+ h00100
+store h00108
+
+# zero-extend read value h9A (as h0000009A) and store it at h10C
+const 3
+loadbzx+ h00100
+store h0010C
+
+# zero-extend read value h78 (as h00000078) and store it at h110
+loadbzx h00102
+store h00110
+
+
+## store values hD4C32B1A and h8877FFEE at h200 and h204
+## writing 2 bytes at a time
+
+# make aligned writes at h200 and h206
+# only byte 1A matters - higher one will be overwritten later
+const h481A
+storew h00200
+
+# only byte 88 matters - lower one will be overwritten later
+const 6
+const h8805
+storew+ h00200
+
+# make unaligned writes at h203, h201 and h205
+const hEED4
+storew h00203
+
+const 1
+const hC32B
+storew+ h00200
+
+# only bytes 77FF matter - higher ones won't be written anyway
+const h71F577FF
+storew h00205
+
+
+## test 2-word loads
+
+# sign-extend read value h2B1A (as h00002B1A) and store it at h208
+const 0
+loadwsx+ h00200
+store h00208
+
+# sign-extend read value hC32B (as hFFFFC32B) and store it at h20C
+loadwsx h00201
+store h0020C
+
+# zero-extend read value hD4C3 (as h0000D4C3) and store it at h210
+loadwzx h00202
+store h00210
+
+# zero-extend read value h77FF (as h000077FF) and store it at h214
+const 5
+loadwzx+ h00200
+store h00214
+
+
+## test unaligned 4-byte memory writes
+
+# write values h92837400, hBECD0001 and h000044AF at h300, h304 and h308
+const 0
+const 0
+const 0
+storeb h300
+storeb h305
+storew h30A
+
+const h01928374
+store h301
+
+const 6
+const h44AFBECD
+store+ h300
+
+
+## test unaligned 4-byte memory reads
+
+# read value hCD000192 and write it at h30C
+load h303
+store h30C
+
+# read value h0044AFBE and write it at h310
+const 7
+load+ h300
+store h310
+
+halt
diff --git a/tests/stack_machine_unaligned/test.v b/tests/stack_machine_unaligned/test.v
new file mode 120000
index 0000000..f5b6a59
--- /dev/null
+++ b/tests/stack_machine_unaligned/test.v
@@ -0,0 +1 @@
+../stack_machine_store/test.v
\ No newline at end of file
diff --git a/tests/stack_machine_unaligned/words_to_verify.mem b/tests/stack_machine_unaligned/words_to_verify.mem
new file mode 100644
index 0000000..a426aa7
--- /dev/null
+++ b/tests/stack_machine_unaligned/words_to_verify.mem
@@ -0,0 +1,19 @@
+// address  value
+   100      9A785634
+   104      FFFFFF9A
+   108      00000078
+   10C	    0000009A
+   110      00000078
+
+   200 	    D4C32B1A
+   204	    8877FFEE
+   208	    00002B1A
+   20C	    FFFFC32B
+   210	    0000D4C3
+   214	    000077FF
+
+   300 	    92837400
+   304	    BECD0001
+   308 	    000044AF
+   30C	    CD000192
+   310	    0044AFBE