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Bitwise»Episode Guide
RISC-V Dynamic Assembler, Part 2
References ▼
Andrew Waterman and Krste Asanović
The RISC-V Instruction Set Manual - Volume 1: User-Level ISA
[1]18:39
GitHub
mamedev /​ mame
[2]46:48
Sega Retro
Sega X Board
[3]46:48
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code generation
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Per Vognsen
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Matt Mascarenhas
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0:07Recap and set the stage for the day
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0:07Recap and set the stage for the day
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0:07Recap and set the stage for the day
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1:03Review the current functionality of our dynamic assembler
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1:03Review the current functionality of our dynamic assembler
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1:03Review the current functionality of our dynamic assembler
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8:05Explain symbol allocation and back-patching
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8:05Explain symbol allocation and back-patching
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8:05Explain symbol allocation and back-patching
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18:39Review bug fix in S-immediate encoding, and the introduction of asm_la() asm_branch() and asm_j()1
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18:39Review bug fix in S-immediate encoding, and the introduction of asm_la() asm_branch() and asm_j()1
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18:39Review bug fix in S-immediate encoding, and the introduction of asm_la() asm_branch() and asm_j()1
📖
22:38Q&A
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22:38Q&A
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22:38Q&A
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22:49xanatos387 Hum is coming and going, when you move your head around, I think
🗪
22:49xanatos387 Hum is coming and going, when you move your head around, I think
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22:49xanatos387 Hum is coming and going, when you move your head around, I think
🗪
23:43Determine to implement basic memory-mapped I/O
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23:43Determine to implement basic memory-mapped I/O
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23:43Determine to implement basic memory-mapped I/O
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24:54Memory-mapped I/O in emulators
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24:54Memory-mapped I/O in emulators
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24:54Memory-mapped I/O in emulators
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28:19Abstract out the RAM handling from Hart into a new Bus struct, and propagate this change
28:19Abstract out the RAM handling from Hart into a new Bus struct, and propagate this change
28:19Abstract out the RAM handling from Hart into a new Bus struct, and propagate this change
36:08Run it to see that it still works
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36:08Run it to see that it still works
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36:08Run it to see that it still works
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36:27Implement memory-mapped I/O, hard-coded for now, enabling bus_load_word() and bus_store_word() to call getchar() and putchar() respectively
36:27Implement memory-mapped I/O, hard-coded for now, enabling bus_load_word() and bus_store_word() to call getchar() and putchar() respectively
36:27Implement memory-mapped I/O, hard-coded for now, enabling bus_load_word() and bus_store_word() to call getchar() and putchar() respectively
40:36Try to perform a asm_lw_imm(asm, X5, GETCHAR_ADDR)
40:36Try to perform a asm_lw_imm(asm, X5, GETCHAR_ADDR)
40:36Try to perform a asm_lw_imm(asm, X5, GETCHAR_ADDR)
41:11Run it to see what it does
🏃
41:11Run it to see what it does
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41:11Run it to see what it does
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41:46Remove the get_char() from main() and introduce pseudo-instructions asm_get_char() and asm_put_char() to exercise our memory-mapped I/O
41:46Remove the get_char() from main() and introduce pseudo-instructions asm_get_char() and asm_put_char() to exercise our memory-mapped I/O
41:46Remove the get_char() from main() and introduce pseudo-instructions asm_get_char() and asm_put_char() to exercise our memory-mapped I/O
44:18Add asm_getchar() and asm_putchar() calls in main()
44:18Add asm_getchar() and asm_putchar() calls in main()
44:18Add asm_getchar() and asm_putchar() calls in main()
44:45Run the simulator to see its infinite output
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44:45Run the simulator to see its infinite output
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44:45Run the simulator to see its infinite output
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45:02Call get_char() in the main loop
45:02Call get_char() in the main loop
45:02Call get_char() in the main loop
45:08Run it, press 'x' and see X5 get populated with 120
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45:08Run it, press 'x' and see X5 get populated with 120
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45:08Run it, press 'x' and see X5 get populated with 120
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45:33Remove both getchar() and print_hart_state() from the main loop, and add a repeat label and asm_j() to our assembly
45:33Remove both getchar() and print_hart_state() from the main loop, and add a repeat label and asm_j() to our assembly
45:33Remove both getchar() and print_hart_state() from the main loop, and add a repeat label and asm_j() to our assembly
46:37Run it to try our echo-loop
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46:37Run it to try our echo-loop
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46:37Run it to try our echo-loop
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46:48A few words on our memory-mapped I/O, with a mention of mame2 and the Sega X Board3
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46:48A few words on our memory-mapped I/O, with a mention of mame2 and the Sega X Board3
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46:48A few words on our memory-mapped I/O, with a mention of mame2 and the Sega X Board3
🗩
54:46Consider moving on to doing an RPN (Reverse Polish notation) to RISC-V code generator
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54:46Consider moving on to doing an RPN (Reverse Polish notation) to RISC-V code generator
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54:46Consider moving on to doing an RPN (Reverse Polish notation) to RISC-V code generator
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56:46RPN to RISC-V code generation
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56:46RPN to RISC-V code generation
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56:46RPN to RISC-V code generation
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58:06Introduce gen_rpn() (and necessary functions) as an RPN to RISC-V code generator
58:06Introduce gen_rpn() (and necessary functions) as an RPN to RISC-V code generator
58:06Introduce gen_rpn() (and necessary functions) as an RPN to RISC-V code generator
1:18:30Try out our gen_rpn()
1:18:30Try out our gen_rpn()
1:18:30Try out our gen_rpn()
1:20:11Step through gen_rpn() to see what it does
🏃
1:20:11Step through gen_rpn() to see what it does
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1:20:11Step through gen_rpn() to see what it does
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1:22:25Print out the registers in the main loop
1:22:25Print out the registers in the main loop
1:22:25Print out the registers in the main loop
1:22:31Run it to follow what gen_rpn() does
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1:22:31Run it to follow what gen_rpn() does
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1:22:31Run it to follow what gen_rpn() does
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1:24:47Enable gen_rpn() to push the correct decimal values of our ASCII characters
1:24:47Enable gen_rpn() to push the correct decimal values of our ASCII characters
1:24:47Enable gen_rpn() to push the correct decimal values of our ASCII characters
1:27:21Run it to see that it pushes the correct values
🏃
1:27:21Run it to see that it pushes the correct values
🏃
1:27:21Run it to see that it pushes the correct values
🏃
1:27:44Try to make gen_rpn() generate the code for a +2
1:27:44Try to make gen_rpn() generate the code for a +2
1:27:44Try to make gen_rpn() generate the code for a +2
1:28:01Run it to see that it computes it correctly, but prints out an extra character
🏃
1:28:01Run it to see that it computes it correctly, but prints out an extra character
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1:28:01Run it to see that it computes it correctly, but prints out an extra character
🏃
1:29:09Make bus_load_word() eat '\n'
1:29:09Make bus_load_word() eat '\n'
1:29:09Make bus_load_word() eat '\n'
1:30:00Run it to see that it looks good
🏃
1:30:00Run it to see that it looks good
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1:30:00Run it to see that it looks good
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1:30:26Make gen_rpn() insert '\n' after each digit
1:30:26Make gen_rpn() insert '\n' after each digit
1:30:26Make gen_rpn() insert '\n' after each digit
1:31:12Run it to see that nicer printout
🏃
1:31:12Run it to see that nicer printout
🏃
1:31:12Run it to see that nicer printout
🏃
1:31:16Introduce a duplication character in gen_rpn()
1:31:16Introduce a duplication character in gen_rpn()
1:31:16Introduce a duplication character in gen_rpn()
1:31:59Run it to see how that works
🏃
1:31:59Run it to see how that works
🏃
1:31:59Run it to see how that works
🏃
1:32:13Reflect on our RPN to RISC-V generator
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1:32:13Reflect on our RPN to RISC-V generator
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1:32:13Reflect on our RPN to RISC-V generator
🗩
1:32:57Try to make gen_rpn() calculate the digit-wise complement
1:32:57Try to make gen_rpn() calculate the digit-wise complement
1:32:57Try to make gen_rpn() calculate the digit-wise complement
1:33:22Run it to see that it works
🏃
1:33:22Run it to see that it works
🏃
1:33:22Run it to see that it works
🏃
1:33:32That's it for today, and likely also next week to write articles
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1:33:32That's it for today, and likely also next week to write articles
🗩
1:33:32That's it for today, and likely also next week to write articles
🗩