otamajakusi / riscv-step-by-step Goto Github PK
View Code? Open in Web Editor NEWRISC-V kernel step-by-step implmenetation
License: MIT License
riscv-step-by-step's Issues
qemu 4.0 (or higher) support
$ pwd
/path/to/steps/8/m
$ timeout 3 make run
qemu-system-riscv32 -nographic -machine sifive_u -kernel m.elf
Hello RISC-V M-Mode.
unknown exception or interrupt: 0000000f, 0000001c, 00000000
Qemu PMP implementation is illegal
multiple supervisor
security: exec-only (=no-read) page
QEMU: atomic test sometimes fail when --singlestep
on steps/13, run qemu as:
qemu-system-riscv32 -nographic -machine virt -kernel m.elf --singlestep
sometimes fails with ++++++++82: "ret" != "1"
$ qemu-system-riscv32 --version
QEMU emulator version 4.1.50 (v4.1.0-838-ge43dc48e6e-dirty)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
recursive virtualization
security: mstatus.sum (permit Supervisor User Memory access)(a.k.a smep/smap)
supervisor
supervisor implementation
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