Add insn examples.

2025-09-27 05:04:39 -04:00 · 2018-05-19 15:23:00 -05:00 · 2018-05-19 15:23:00 -05:00 · 3fbb8f9642
commit 3fbb8f9642
parent 27e5dd4f94
26 changed files with 330 additions and 4 deletions
--- a/book/programs/src/Makefile
+++ b/book/programs/src/Makefile
@ -1,5 +1,7 @@

 SUBDIRS=\
+	nop\
+	li\
 	ebreak

 TOP=.
--- a/book/programs/src/ebreak/ebreak.lst
+++ b/book/programs/src/ebreak/ebreak.lst
@ -1,8 +1,4 @@
-
 ebreak:     file format elf32-littleriscv
-
-
 Disassembly of section .text:
-
 00000000 <_start>:
   0:	00100073          	ebreak
--- a/book/programs/src/li/.gitignore
+++ b/book/programs/src/li/.gitignore
@ -0,0 +1 @@
+li
--- a/book/programs/src/li/Makefile
+++ b/book/programs/src/li/Makefile
@ -0,0 +1,18 @@
+
+PROG=li
+
+all:: $(PROG).out $(PROG).lst
+
+$(PROG).out:: $(PROG).bin
+	./run.sh > $@ 2>&1
+
+$(PROG).bin:: $(PROG)
+
+clean::
+	rm -f $(PROG) *.o *.lst *.bin *.srec *.out
+
+TOP=..
+include $(TOP)/Make.rules
+
+
+
--- a/book/programs/src/li/li.S
+++ b/book/programs/src/li/li.S
@ -0,0 +1,12 @@
+	.text				# put this into the text section
+	.align	2			# align to a multiple of 4
+	.globl	_start
+
+_start:
+	li	t0, 0x12345678
+	li	t1, 0x11111fff
+	li	t1, 0
+	li	t1, -1
+	li	t1, 1
+	li	t1, 0xf1f1f1f1
+	ebreak
--- a/book/programs/src/li/li.lst
+++ b/book/programs/src/li/li.lst
@ -0,0 +1,13 @@
+li:     file format elf32-littleriscv
+Disassembly of section .text:
+00000000 <_start>:
+   0:	123452b7          	lui	t0,0x12345
+   4:	67828293          	addi	t0,t0,1656 # 12345678 <__global_pointer$+0x12343e50>
+   8:	11112337          	lui	t1,0x11112
+   c:	fff30313          	addi	t1,t1,-1 # 11111fff <__global_pointer$+0x111107d7>
+  10:	00000313          	li	t1,0
+  14:	fff00313          	li	t1,-1
+  18:	00100313          	li	t1,1
+  1c:	f1f1f337          	lui	t1,0xf1f1f
+  20:	1f130313          	addi	t1,t1,497 # f1f1f1f1 <__global_pointer$+0xf1f1d9c9>
+  24:	00100073          	ebreak
--- a/book/programs/src/li/li.out
+++ b/book/programs/src/li/li.out
@ -0,0 +1,68 @@
+$ rvddt -f li.bin
+sp initialized to top of memory: 0x0000fff0
+Loading 'li.bin' to 0x0
+This is rvddt.  Enter ? for help.
+ddt> d 0 16
+ 00000000: b7 52 34 12 93 82 82 67-37 23 11 11 13 03 f3 ff *.R4....g7#......*
+ddt> t 0 1000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000000
+00000000: 123452b7  lui     x5, 0x12345   # x5 = 0x12345000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345000 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000004
+00000004: 67828293  addi    x5, x5, 1656  # x5 = 0x12345678 = 0x12345000 + 0x00000678
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000008
+00000008: 11112337  lui     x6, 0x11112   # x6 = 0x11112000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 11112000 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 0000000c
+0000000c: fff30313  addi    x6, x6, -1    # x6 = 0x11111fff = 0x11112000 + 0xffffffff
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 11111fff f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000010
+00000010: 00000313  addi    x6, x0, 0     # x6 = 0x00000000 = 0x00000000 + 0x00000000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 00000000 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000014
+00000014: fff00313  addi    x6, x0, -1    # x6 = 0xffffffff = 0x00000000 + 0xffffffff
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 ffffffff f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000018
+00000018: 00100313  addi    x6, x0, 1     # x6 = 0x00000001 = 0x00000000 + 0x00000001
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 00000001 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 0000001c
+0000001c: f1f1f337  lui     x6, 0xf1f1f   # x6 = 0xf1f1f000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 f1f1f000 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000020
+00000020: 1f130313  addi    x6, x6, 497   # x6 = 0xf1f1f1f1 = 0xf1f1f000 + 0x000001f1
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 12345678 f1f1f1f1 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000024
+00000024: ebreak
+ddt> x
--- a/book/programs/src/li/run.sh
+++ b/book/programs/src/li/run.sh
@ -0,0 +1,7 @@
+prompt="$" 
+cmd="rvddt -f li.bin"
+echo "$prompt $cmd"
+$cmd <<!
+d 0 16
+t 0 1000
+!
--- a/book/programs/src/mv/.gitignore
+++ b/book/programs/src/mv/.gitignore
@ -0,0 +1 @@
+mv
--- a/book/programs/src/mv/Makefile
+++ b/book/programs/src/mv/Makefile
@ -0,0 +1,18 @@
+
+PROG=mv
+
+all:: $(PROG).out $(PROG).lst
+
+$(PROG).out:: $(PROG).bin
+	./run.sh > $@ 2>&1
+
+$(PROG).bin:: $(PROG)
+
+clean::
+	rm -f $(PROG) *.o *.lst *.bin *.srec *.out
+
+TOP=..
+include $(TOP)/Make.rules
+
+
+
--- a/book/programs/src/mv/mv.S
+++ b/book/programs/src/mv/mv.S
@ -0,0 +1,9 @@
+	.text				# put this into the text section
+	.align	2			# align to a multiple of 4
+	.globl	_start
+
+_start:
+	addi	t3, t4, 0	# t3 = t4
+	mv		t3, t4		# t3 = t4
+
+	ebreak
--- a/book/programs/src/mv/mv.lst
+++ b/book/programs/src/mv/mv.lst
@ -0,0 +1,6 @@
+mv:     file format elf32-littleriscv
+Disassembly of section .text:
+00000000 <_start>:
+   0:	000e8e13          	mv	t3,t4
+   4:	000e8e13          	mv	t3,t4
+   8:	00100073          	ebreak
--- a/book/programs/src/mv/mv.out
+++ b/book/programs/src/mv/mv.out
@ -0,0 +1,26 @@
+$ rvddt -f mv.bin
+sp initialized to top of memory: 0x0000fff0
+Loading 'mv.bin' to 0x0
+This is rvddt.  Enter ? for help.
+ddt> d 0 16
+ 00000000: 13 8e 0e 00 13 8e 0e 00-73 00 10 00 a5 a5 a5 a5 *........s.......*
+ddt> t 0 1000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000000
+00000000: 000e8e13  addi    x28, x29, 0   # x28 = 0xf0f0f0f0 = 0xf0f0f0f0 + 0x00000000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000004
+00000004: 000e8e13  addi    x28, x29, 0   # x28 = 0xf0f0f0f0 = 0xf0f0f0f0 + 0x00000000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000008
+00000008: ebreak
+ddt> x
--- a/book/programs/src/mv/run.sh
+++ b/book/programs/src/mv/run.sh
@ -0,0 +1,7 @@
+prompt="$" 
+cmd="rvddt -f mv.bin"
+echo "$prompt $cmd"
+$cmd <<!
+d 0 16
+t 0 1000
+!
--- a/book/programs/src/mvzero/.gitignore
+++ b/book/programs/src/mvzero/.gitignore
@ -0,0 +1 @@
+mv
--- a/book/programs/src/mvzero/Makefile
+++ b/book/programs/src/mvzero/Makefile
@ -0,0 +1,18 @@
+
+PROG=mv
+
+all:: $(PROG).out $(PROG).lst
+
+$(PROG).out:: $(PROG).bin
+	./run.sh > $@ 2>&1
+
+$(PROG).bin:: $(PROG)
+
+clean::
+	rm -f $(PROG) *.o *.lst *.bin *.srec *.out
+
+TOP=..
+include $(TOP)/Make.rules
+
+
+
--- a/book/programs/src/mvzero/mv.S
+++ b/book/programs/src/mvzero/mv.S
@ -0,0 +1,8 @@
+	.text				# put this into the text section
+	.align	2			# align to a multiple of 4
+	.globl	_start
+
+_start:
+	mv		t3, x0		# t3 = 0
+
+	ebreak
--- a/book/programs/src/mvzero/mv.lst
+++ b/book/programs/src/mvzero/mv.lst
@ -0,0 +1,5 @@
+mv:     file format elf32-littleriscv
+Disassembly of section .text:
+00000000 <_start>:
+   0:	00000e13          	li	t3,0
+   4:	00100073          	ebreak
--- a/book/programs/src/mvzero/mv.out
+++ b/book/programs/src/mvzero/mv.out
@ -0,0 +1,29 @@
+$ rvddt -f mv.bin
+sp initialized to top of memory: 0x0000fff0
+Loading 'mv.bin' to 0x0
+This is rvddt.  Enter ? for help.
+ddt> a
+ddt> d 0 16
+ 00000000: 13 0e 00 00 73 00 10 00-a5 a5 a5 a5 a5 a5 a5 a5 *....s...........*
+ddt> t 0 1000
+ zero  x0 00000000  ra  x1 f0f0f0f0  sp  x2 0000fff0  gp  x3 f0f0f0f0
+   tp  x4 f0f0f0f0  t0  x5 f0f0f0f0  t1  x6 f0f0f0f0  t2  x7 f0f0f0f0
+   s0  x8 f0f0f0f0  s1  x9 f0f0f0f0  a0 x10 f0f0f0f0  a1 x11 f0f0f0f0
+   a2 x12 f0f0f0f0  a3 x13 f0f0f0f0  a4 x14 f0f0f0f0  a5 x15 f0f0f0f0
+   a6 x16 f0f0f0f0  a7 x17 f0f0f0f0  s2 x18 f0f0f0f0  s3 x19 f0f0f0f0
+   s4 x20 f0f0f0f0  s5 x21 f0f0f0f0  s6 x22 f0f0f0f0  s7 x23 f0f0f0f0
+   s8 x24 f0f0f0f0  s9 x25 f0f0f0f0 s10 x26 f0f0f0f0 S11 x27 f0f0f0f0
+   t3 x28 f0f0f0f0  t4 x29 f0f0f0f0  t5 x30 f0f0f0f0  t6 x31 f0f0f0f0
+       pc 00000000
+00000000: 00000e13  addi    t3, zero, 0   # t3 = 0x00000000 = 0x00000000 + 0x00000000
+ zero  x0 00000000  ra  x1 f0f0f0f0  sp  x2 0000fff0  gp  x3 f0f0f0f0
+   tp  x4 f0f0f0f0  t0  x5 f0f0f0f0  t1  x6 f0f0f0f0  t2  x7 f0f0f0f0
+   s0  x8 f0f0f0f0  s1  x9 f0f0f0f0  a0 x10 f0f0f0f0  a1 x11 f0f0f0f0
+   a2 x12 f0f0f0f0  a3 x13 f0f0f0f0  a4 x14 f0f0f0f0  a5 x15 f0f0f0f0
+   a6 x16 f0f0f0f0  a7 x17 f0f0f0f0  s2 x18 f0f0f0f0  s3 x19 f0f0f0f0
+   s4 x20 f0f0f0f0  s5 x21 f0f0f0f0  s6 x22 f0f0f0f0  s7 x23 f0f0f0f0
+   s8 x24 f0f0f0f0  s9 x25 f0f0f0f0 s10 x26 f0f0f0f0 S11 x27 f0f0f0f0
+   t3 x28 00000000  t4 x29 f0f0f0f0  t5 x30 f0f0f0f0  t6 x31 f0f0f0f0
+       pc 00000004
+00000004: ebreak
+ddt> x
--- a/book/programs/src/mvzero/run.sh
+++ b/book/programs/src/mvzero/run.sh
@ -0,0 +1,8 @@
+prompt="$" 
+cmd="rvddt -f mv.bin"
+echo "$prompt $cmd"
+$cmd <<!
+a
+d 0 16
+t 0 1000
+!
--- a/book/programs/src/nop/.gitignore
+++ b/book/programs/src/nop/.gitignore
@ -0,0 +1 @@
+nop
--- a/book/programs/src/nop/Makefile
+++ b/book/programs/src/nop/Makefile
@ -0,0 +1,18 @@
+
+PROG=nop
+
+all:: $(PROG).out $(PROG).lst
+
+$(PROG).out:: $(PROG).bin
+	./run.sh > $@ 2>&1
+
+$(PROG).bin:: $(PROG)
+
+clean::
+	rm -f $(PROG) *.o *.lst *.bin *.srec *.out
+
+TOP=..
+include $(TOP)/Make.rules
+
+
+
--- a/book/programs/src/nop/nop.S
+++ b/book/programs/src/nop/nop.S
@ -0,0 +1,9 @@
+	.text				# put this into the text section
+	.align	2			# align to a multiple of 4
+	.globl	_start
+
+_start:
+	addi	x0, x0, 0	# these two instructions assemble into the same thing!
+	nop
+
+	ebreak
--- a/book/programs/src/nop/nop.lst
+++ b/book/programs/src/nop/nop.lst
@ -0,0 +1,6 @@
+nop:     file format elf32-littleriscv
+Disassembly of section .text:
+00000000 <_start>:
+   0:	00000013          	nop
+   4:	00000013          	nop
+   8:	00100073          	ebreak
--- a/book/programs/src/nop/nop.out
+++ b/book/programs/src/nop/nop.out
@ -0,0 +1,32 @@
+$ rvddt -f nop.bin
+sp initialized to top of memory: 0x0000fff0
+Loading 'nop.bin' to 0x0
+This is rvddt.  Enter ? for help.
+ddt> d 0 16
+ 00000000: 13 00 00 00 13 00 00 00-73 00 10 00 a5 a5 a5 a5 *........s.......*
+ddt> t 0 1000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000000
+00000000: 00000013  addi    x0, x0, 0     # x0 = 0x00000000 = 0x00000000 + 0x00000000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000004
+00000004: 00000013  addi    x0, x0, 0     # x0 = 0x00000000 = 0x00000000 + 0x00000000
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000008
+00000008: ebreak
+ddt> r
+   x0 00000000 f0f0f0f0 0000fff0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   x8 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x16 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+  x24 f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0-f0f0f0f0 f0f0f0f0 f0f0f0f0 f0f0f0f0
+   pc 00000008
+ddt> x
--- a/book/programs/src/nop/run.sh
+++ b/book/programs/src/nop/run.sh
@ -0,0 +1,7 @@
+prompt="$" 
+cmd="rvddt -f nop.bin"
+echo "$prompt $cmd"
+$cmd <<!
+d 0 16
+t 0 1000
+!