Annotate riscy055
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Matt Mascarenhas
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[video member=miotatsu stream_platform=twitch project=riscy title="Studying Calling Conventions" vod_platform=youtube id=WojkdLsbgvc annotator=Miblo]
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[0:07][Recap and set the stage for the day][:speech]
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[1:04][Make pwm_speed_test to see multiple definitions of handle_trap() due to init.c being included]
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[4:11][Ponder modifying common.mk to avoid including init.c twice][:research]
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[7:15][Note that the trap handler is responsible for handling unimplemented instructions][:speech]
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[8:58][Read use_pll() in init.c][:research]
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[11:13][Stop passing -DNO_INIT in the Makefile and remove _putc() and _puts() from pwm_speed_test.c]
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[12:20][Rename handle_trap() to handle_m_ext_interrupt() and let init.c setup the trap handler for us]
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[15:04][Consult the other demos in the Freedom E SDK for printf and write][:research]
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[18:07][#include stdio.h and make pwm_0_handler() call printf()]
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[19:18][Comment out all the headers, build and readd them until we have no compile errors]
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[21:36][Make and successfully upload to the HiFive1]
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[22:09][@croepha][Hello]
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[22:14][Reset the HiFive1 and see a "Hello, World!" before it terminates][:run]
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[23:01][@croepha][Oooh, are we uploading to the HiFive1?]
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[23:06][Temporarily comment out everything before the printf(), build and upload it]
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[24:26][:Run the program to see that it terminates before printing]
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[24:49][Comment out the :asm volatile ("wfi") and consult the other demos for alternate ways to infinite loop][:research]
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[29:31][Build and upload pwm_speed_test]
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[29:56][:Run and see the same behaviour]
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[30:03][Try putting the printf() within the infinite loop, build and upload]
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[30:32][:Run and see the same behaviour]
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[30:55][Try to upload led_fade to the HiFive1]
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[32:01][Consult the Getting Started Guide[ref
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site="SiFive Developers"
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page="HiFive1 Getting Started Guide"
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url=https://dev.sifive.com/hifive1/hifive1-getting-started-guide/] and the Forums[ref
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site="SiFive Forums"
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page="What are you building with yours?"
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url=https://forums.sifive.com/t/what-are-you-building-with-yours/209/5] for the correct make clean invocation][:research]
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[34:45][@croepha][Backups man, backups]
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[35:09][Consider reading documentation][:speech]
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[35:41][@croepha][I highly recommend doing an automated full system backup][quote 18]
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[36:05][Scan through the documentation for topics to learn][:research]
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[38:29][Jump to Chapter 8 - Debug[ref
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site="SiFive Developers"
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page="Freedom E310-G000 Manual"
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url=https://www.sifive.com/documentation/chips/freedom-e310-g000-manual/]][:research]
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[39:10][@croepha][By the way, I think I read somewhere that there is already GDB support for RISC-V]
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[39:38][Read Chapter 1.4 - Debug Mode[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:research]
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[42:43][@croepha][Do you have a JTAG cable?]
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[43:05][Scan the Getting Started Guide for debug information[ref
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site="SiFive Developers"
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page="HiFive1 Getting Started Guide"
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url=https://dev.sifive.com/hifive1/hifive1-getting-started-guide/] and discover "make run_debug"][:research]
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[45:35][Read Chapter 3.2.2 - Wait for Interrupt[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:research]
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[51:24][Read Chapter 20 - Calling Convention[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[52:05][Read Chapter 20.1 - C Datatypes and Alignment[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[54:01][Show how nwr_mem.h determines the integer model][:research]
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[55:07][Chapter 20.1 continued[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[57:01][Read Chapter 20.2 - RVG Calling Convention[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[59:55][Reflect on RISC-V's handling of a 64-bit value on a 32-bit machine][:speech]
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[1:01:16][Chapter 20.2 continued[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[1:02:45][Note a good rule of thumb: in RISC-V, arguments more than twice the size of a pointer get passed by reference][:speech]
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[1:03:38][Chapter 20.2 continued[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[1:08:04][Consult Table 20.2: RISC-V calling convention register usage[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[1:10:22][Read Chapter 20.3 - Soft-Float Calling Convention[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[1:14:29][Read Chapter 20.4 - RV32E Calling Convention[ref
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site=RISC-V
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page="User-Level ISA Specification v2.1"
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url=https://riscv.org/specifications]][:research]
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[1:15:01][That ends that][:speech]
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[/video]
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