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Hello World in RISC-V ASM (2/2)
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Previous: 'Hello World in RISC-V ASM (1/2)'
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0:01Welcome to the stream
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0:01Welcome to the stream
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0:01Welcome to the stream
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0:33Review additions to the Useful Links: unistd.h1 and RISC-V: Linux Syscall Interface2
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0:33Review additions to the Useful Links: unistd.h1 and RISC-V: Linux Syscall Interface2
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0:33Review additions to the Useful Links: unistd.h1 and RISC-V: Linux Syscall Interface2
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3:02Continue reading through the RISC-V Linux Syscall Interface3
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3:02Continue reading through the RISC-V Linux Syscall Interface3
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3:02Continue reading through the RISC-V Linux Syscall Interface3
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4:55Finish reading through the RISC-V Linux Syscall Interface5
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4:55Finish reading through the RISC-V Linux Syscall Interface5
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4:55Finish reading through the RISC-V Linux Syscall Interface5
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5:34Return to hello.S assembly and include the li and mv instructions in loop 1
5:34Return to hello.S assembly and include the li and mv instructions in loop 1
5:34Return to hello.S assembly and include the li and mv instructions in loop 1
7:32Lower the exit call in main() from hula to assembly
7:32Lower the exit call in main() from hula to assembly
7:32Lower the exit call in main() from hula to assembly
11:02Set up to lower the return call in main() from hula to assembly
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11:02Set up to lower the return call in main() from hula to assembly
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11:02Set up to lower the return call in main() from hula to assembly
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11:40Plug bitwise7
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11:40Plug bitwise7
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11:40Plug bitwise7
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13:14Lower the return call in main() from hula to assembly
13:14Lower the return call in main() from hula to assembly
13:14Lower the return call in main() from hula to assembly
14:27Compare our newly written RISC-V assembly with hello.S in the repo,8 and consult the RISC-V ELF psABI specification9 for documentation on the stack frame
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14:27Compare our newly written RISC-V assembly with hello.S in the repo,8 and consult the RISC-V ELF psABI specification9 for documentation on the stack frame
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14:27Compare our newly written RISC-V assembly with hello.S in the repo,8 and consult the RISC-V ELF psABI specification9 for documentation on the stack frame
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17:54Push the return address of main onto the stack
17:54Push the return address of main onto the stack
17:54Push the return address of main onto the stack
21:14A few words on generating the code for multiple returns, wondering what Per has to say about it
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21:14A few words on generating the code for multiple returns, wondering what Per has to say about it
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21:14A few words on generating the code for multiple returns, wondering what Per has to say about it
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22:12Enable main to correctly return from all branches, and offset the stack pointer10
22:12Enable main to correctly return from all branches, and offset the stack pointer10
22:12Enable main to correctly return from all branches, and offset the stack pointer10
30:32A few words on using the temporary "a" registers, and the possible performance ramifications of being tight with register usage
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30:32A few words on using the temporary "a" registers, and the possible performance ramifications of being tight with register usage
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30:32A few words on using the temporary "a" registers, and the possible performance ramifications of being tight with register usage
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32:31Enable main to reuse the a1 register
32:31Enable main to reuse the a1 register
32:31Enable main to reuse the a1 register
34:28Fix main to correctly break out of the print loop
34:28Fix main to correctly break out of the print loop
34:28Fix main to correctly break out of the print loop
36:48Read through hello.S to check it all looks correct
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36:48Read through hello.S to check it all looks correct
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36:48Read through hello.S to check it all looks correct
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40:08Fix _start to correctly pop the loaded word off the stack
40:08Fix _start to correctly pop the loaded word off the stack
40:08Fix _start to correctly pop the loaded word off the stack
40:31Finish reading through hello.S and consider it all good
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40:31Finish reading through hello.S and consider it all good
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40:31Finish reading through hello.S and consider it all good
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41:15Assemble our program to see assembly errors
41:15Assemble our program to see assembly errors
41:15Assemble our program to see assembly errors
42:13Remove comment and fix assembly errors
42:13Remove comment and fix assembly errors
42:13Remove comment and fix assembly errors
42:42Assemble our program to see errors on bez and beq
42:42Assemble our program to see errors on bez and beq
42:42Assemble our program to see errors on bez and beq
44:27Grab the RISC-V Reader11
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44:27Grab the RISC-V Reader11
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44:27Grab the RISC-V Reader11
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45:24Rename bez to beqz, and fix our beq calls, in conjunction with the RISC-V Reader12
45:24Rename bez to beqz, and fix our beq calls, in conjunction with the RISC-V Reader12
45:24Rename bez to beqz, and fix our beq calls, in conjunction with the RISC-V Reader12
46:48Consult the RISC-V Reader13 for information on loading into the frame pointer
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46:48Consult the RISC-V Reader13 for information on loading into the frame pointer
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46:48Consult the RISC-V Reader13 for information on loading into the frame pointer
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51:12Try to make _start load 0 into s0 rather than fp
51:12Try to make _start load 0 into s0 rather than fp
51:12Try to make _start load 0 into s0 rather than fp
51:55Assemble it to see that this fixed that error
51:55Assemble it to see that this fixed that error
51:55Assemble it to see that this fixed that error
52:44Stick .section in front of .rodata as per the RISC-V Reader14
52:44Stick .section in front of .rodata as per the RISC-V Reader14
52:44Stick .section in front of .rodata as per the RISC-V Reader14
53:08Assemble it successfully
53:08Assemble it successfully
53:08Assemble it successfully
54:07Link our program with ld
54:07Link our program with ld
54:07Link our program with ld
54:20Run it to see that it works
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54:20Run it to see that it works
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54:20Run it to see that it works
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54:41Inspect our binary
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54:41Inspect our binary
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54:41Inspect our binary
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56:00On writing this program as an example of code that hula should compile to
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56:00On writing this program as an example of code that hula should compile to
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56:00On writing this program as an example of code that hula should compile to
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56:18Streamline the return code loads in main
56:18Streamline the return code loads in main
56:18Streamline the return code loads in main
1:00:37Prevent _start from zeroing out the frame pointer
1:00:37Prevent _start from zeroing out the frame pointer
1:00:37Prevent _start from zeroing out the frame pointer
1:02:23Assemble and link it
1:02:23Assemble and link it
1:02:23Assemble and link it
1:02:36Run it to see that it still works
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1:02:36Run it to see that it still works
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1:02:36Run it to see that it still works
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1:02:45Consider the episode done, with a glimpse into the future booting Fedora directly, hand-writing the machine code for our "Hello, World!" and covering compressed instructions
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1:02:45Consider the episode done, with a glimpse into the future booting Fedora directly, hand-writing the machine code for our "Hello, World!" and covering compressed instructions
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1:02:45Consider the episode done, with a glimpse into the future booting Fedora directly, hand-writing the machine code for our "Hello, World!" and covering compressed instructions
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1:07:32Thoughts on avoiding security vulnerabilities by owning the entire chain of production
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1:07:32Thoughts on avoiding security vulnerabilities by owning the entire chain of production
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1:07:32Thoughts on avoiding security vulnerabilities by owning the entire chain of production
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1:12:57Further thoughts on the elegance of FORTH and its suitability for bootstrapping
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1:12:57Further thoughts on the elegance of FORTH and its suitability for bootstrapping
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1:12:57Further thoughts on the elegance of FORTH and its suitability for bootstrapping
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1:15:50Glimpse into the future designing a custom case, streaming from our RISC-V system and building a Linux distribution for it
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1:15:50Glimpse into the future designing a custom case, streaming from our RISC-V system and building a Linux distribution for it
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1:15:50Glimpse into the future designing a custom case, streaming from our RISC-V system and building a Linux distribution for it
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1:17:16End this episode here
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1:17:16End this episode here
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1:17:16End this episode here
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Next: 'Unboxing a HiFive Unleashed Expansion Board'
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