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0:09Recap and set the stage for the day
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0:09Recap and set the stage for the day
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0:09Recap and set the stage for the day
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0:52Review the work on expression evaluation, in parse_expr() and related functions
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0:52Review the work on expression evaluation, in parse_expr() and related functions
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0:52Review the work on expression evaluation, in parse_expr() and related functions
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7:05Show the dummy examples of expression evaluation
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7:05Show the dummy examples of expression evaluation
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7:05Show the dummy examples of expression evaluation
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7:46Run the simulator to show the expression evaluation in action
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7:46Run the simulator to show the expression evaluation in action
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7:46Run the simulator to show the expression evaluation in action
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8:03Review the addition of the magic token '$' to denote the current address, and the .print instruction 📖 8:03Review the addition of the magic token '$' to denote the current address, and the .print instruction
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8:03Review the addition of the magic token '$' to denote the current address, and the .print instruction 📖 10:26Run the simulator to show our address printouts 🏃 10:26Run the simulator to show our address printouts 🏃 10:26Run the simulator to show our address printouts 🏃 10:36On the utility of subtracting the current address '$' from that of a label
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10:36On the utility of subtracting the current address '$' from that of a label 📖 10:36On the utility of subtracting the current address '$' from that of a label
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12:40Review the addition of named variables
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12:40Review the addition of named variables
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12:40Review the addition of named variables
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13:37Note that we were in-progress with "if" and the ability to .include files
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13:37Note that we were in-progress with "if" and the ability to .include files
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13:37Note that we were in-progress with "if" and the ability to .include files
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14:27Q&A
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14:27Q&A
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14:27Q&A
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14:50 I notice there is no short circuiting for those && and || operators, though that might be a pretty rare need
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14:50 I notice there is no short circuiting for those && and || operators, though that might be a pretty rare need
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14:50 I notice there is no short circuiting for those && and || operators, though that might be a pretty rare need
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16:23 Can .print print registers as well?
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16:23 Can .print print registers as well?
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16:23 Can .print print registers as well?
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17:00Outline the next features to add to the simulator, including better debugability and exception handling
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17:00Outline the next features to add to the simulator, including better debugability and exception handling
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17:00Outline the next features to add to the simulator, including better debugability and exception handling
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20:41Determine to implement breakpoints
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20:41Determine to implement breakpoints
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20:41Determine to implement breakpoints
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22:12Instruction breakpoints
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22:12Instruction breakpoints
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22:12Instruction breakpoints
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24:14Dive into instruction breakpoints, introducing a Breakpoint struct for Hart to contain and step() to handle
24:14Dive into instruction breakpoints, introducing a Breakpoint struct for Hart to contain and step() to handle
24:14Dive into instruction breakpoints, introducing a Breakpoint struct for Hart to contain and step() to handle
30:22Run the simulator to see that it still works
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30:22Run the simulator to see that it still works
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30:22Run the simulator to see that it still works
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31:10Introduce cmd_loop() and breakpoint_callback() to demo a trick for integrating callbacks without inverting control
31:10Introduce cmd_loop() and breakpoint_callback() to demo a trick for integrating callbacks without inverting control
31:10Introduce cmd_loop() and breakpoint_callback() to demo a trick for integrating callbacks without inverting control
34:25Explain the thought behind this breakpoint callback integration trick
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34:25Explain the thought behind this breakpoint callback integration trick
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34:25Explain the thought behind this breakpoint callback integration trick
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38:21Implement cmd_loop() and breakpoint_callback()
38:21Implement cmd_loop() and breakpoint_callback()
38:21Implement cmd_loop() and breakpoint_callback()
43:14Run it, successfully hit our breakpoint, and take a look at our call stack
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43:14Run it, successfully hit our breakpoint, and take a look at our call stack
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43:14Run it, successfully hit our breakpoint, and take a look at our call stack
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45:33Install emacs
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45:33Install emacs
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45:33Install emacs
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45:48Thoughts on using callbacks as a poor man's coroutine
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45:48Thoughts on using callbacks as a poor man's coroutine
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45:48Thoughts on using callbacks as a poor man's coroutine
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47:30Issues with breakpoint handling, restarting execution
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47:30Issues with breakpoint handling, restarting execution
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47:30Issues with breakpoint handling, restarting execution
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50:49Trace points
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50:49Trace points
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50:49Trace points
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51:55Implement trace points, augmenting the Hart with a trace_load_callback for the load_*() functions to use
51:55Implement trace points, augmenting the Hart with a trace_load_callback for the load_*() functions to use
51:55Implement trace points, augmenting the Hart with a trace_load_callback for the load_*() functions to use
56:34Introduce getline() and begin to enable cmd_loop() to handle and print trace point information
56:34Introduce getline() and begin to enable cmd_loop() to handle and print trace point information
56:34Introduce getline() and begin to enable cmd_loop() to handle and print trace point information
1:00:54Run the simulator to see that it still works
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1:00:54Run the simulator to see that it still works
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1:00:54Run the simulator to see that it still works
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1:01:15Enable cmd_loop() to handle unknown commands
1:01:15Enable cmd_loop() to handle unknown commands
1:01:15Enable cmd_loop() to handle unknown commands
1:01:23Run it to see that it catches unknown commands
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1:01:23Run it to see that it catches unknown commands
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1:01:23Run it to see that it catches unknown commands
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1:01:50Enable cmd_loop() to handle break point toggling
1:01:50Enable cmd_loop() to handle break point toggling
1:01:50Enable cmd_loop() to handle break point toggling
1:03:37Run it to try out our breakpoint handling
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1:03:37Run it to try out our breakpoint handling
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1:03:37Run it to try out our breakpoint handling
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1:04:46Finish enabling cmd_loop() to handle trace points
1:04:46Finish enabling cmd_loop() to handle trace points
1:04:46Finish enabling cmd_loop() to handle trace points
1:06:05Run it and try toggling trace points
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1:06:05Run it and try toggling trace points
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1:06:05Run it and try toggling trace points
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1:08:07Run it to see our trace points working
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1:08:07Run it to see our trace points working
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1:08:07Run it to see our trace points working
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1:08:57Dive into visual disassembly, introducing print_instruction()
1:08:57Dive into visual disassembly, introducing print_instruction()
1:08:57Dive into visual disassembly, introducing print_instruction()
1:26:02Run it to see our instruction disassembly
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1:26:02Run it to see our instruction disassembly
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1:26:02Run it to see our instruction disassembly
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1:27:01Enable print_instruction() to handle the JAL and JALR instructions
1:27:01Enable print_instruction() to handle the JAL and JALR instructions
1:27:01Enable print_instruction() to handle the JAL and JALR instructions
1:28:06Run it to see that our instruction disassembly works
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1:28:06Run it to see that our instruction disassembly works
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1:28:06Run it to see that our instruction disassembly works
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1:29:06Enable print_instruction() to take and display a pc (program counter)
1:29:06Enable print_instruction() to take and display a pc (program counter)
1:29:06Enable print_instruction() to take and display a pc (program counter)
1:30:38Run it to see our program counter along with the disassembled instructions
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1:30:38Run it to see our program counter along with the disassembled instructions
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1:30:38Run it to see our program counter along with the disassembled instructions
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1:31:57Fix the AUIPC case in print_instruction()
1:31:57Fix the AUIPC case in print_instruction()
1:31:57Fix the AUIPC case in print_instruction()
1:32:17Run it to see that the AUIPC, along with all else, now looks reasonable
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1:32:17Run it to see that the AUIPC, along with all else, now looks reasonable
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1:32:17Run it to see that the AUIPC, along with all else, now looks reasonable
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1:33:41Stop now with a glimpse into introspection
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1:33:41Stop now with a glimpse into introspection
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1:33:41Stop now with a glimpse into introspection
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1:34:51Make print_instruction() consistently print [ and ]
1:34:51Make print_instruction() consistently print [ and ]
1:34:51Make print_instruction() consistently print [ and ]
1:35:07Run it and consider fuller breakpoint handling
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1:35:07Run it and consider fuller breakpoint handling
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1:35:07Run it and consider fuller breakpoint handling
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1:35:52Q&A
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1:35:52Q&A
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1:35:52Q&A
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1:36:02 Oh, snprintf() returns the number of characters it wanted to print, so "buf +=" can make "buf" be past "end" and cause an overflow if you print again
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1:36:02 Oh, snprintf() returns the number of characters it wanted to print, so "buf +=" can make "buf" be past "end" and cause an overflow if you print again
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1:36:02 Oh, snprintf() returns the number of characters it wanted to print, so "buf +=" can make "buf" be past "end" and cause an overflow if you print again
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1:36:58Change print_instruction() to use sprintf() rather than snprint()
1:36:58Change print_instruction() to use sprintf() rather than snprint()
1:36:58Change print_instruction() to use sprintf() rather than snprint()
1:38:16Run it to see that it's okay
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1:38:16Run it to see that it's okay
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1:38:16Run it to see that it's okay
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1:38:24Call it a day with a glimpse into event handling and control flow
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1:38:24Call it a day with a glimpse into event handling and control flow
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1:38:24Call it a day with a glimpse into event handling and control flow
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