2025-02-09 01:09:13 +00:00
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Calculator
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==========
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Aims to be a calculator implemented in 32-bit RISC-V assembly, initially targeting the
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inexpensive [CH32V003 RV32EC microcontroller][CH32V003]: 48Mhz 2KB SRAM, 16KB Flash.
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Notes
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-----
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### Disassemble
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riscv64-unknown-elf-objdump -D main.o
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2025-02-09 05:09:53 +00:00
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### List Symbols
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riscv64-unknown-elf-nm calc.o
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### List segment info
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readelf -l calc.elf
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2025-02-13 10:32:18 +00:00
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### Build with LLVM
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make AS=clang ASFLAGS="-g -mabi=ilp32e --target=riscv32-unknown-elf -nostdlib -c"
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2025-02-09 01:09:13 +00:00
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Resources
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---------
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* https://riscv-programming.org/book/riscv-book.html
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* [CH32V003 Datasheet](https://www.wch-ic.com/downloads/CH32V003RM_PDF.html)
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* [QingKeV2 Processor Manual](https://www.wch-ic.com/downloads/QingKeV2_Processor_Manual_PDF.html) — core used in the CH32V003
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2025-02-09 01:21:38 +00:00
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### Syscalls on RV32E
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2025-02-09 01:32:46 +00:00
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[Syscalls supported by rv32emu](https://github.com/sysprog21/rv32emu/blob/master/docs/syscall.md).
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2025-02-09 01:21:38 +00:00
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Consensus seems to be pass the syscall number in `t0`:
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* https://github.com/riscvarchive/riscv-qemu/pull/61
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* https://github.com/sysprog21/rv32emu/blob/1286b3c41eec541b68f3d25462722ba848bf4e51/src/syscall.c#L484
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2025-02-09 01:09:13 +00:00
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[CH32V003]: https://www.wch-ic.com/products/CH32V003.html
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