How to print strings in a bare metal program in spike?

[Junyi Yang]

Hello!

I want to write a bare metal program to print someting in qemu-system-riscv32 -machine spike_v1.10.

But I don't know how to do that.

I also find anything about that.

How can I do that?

Thanks.

[Jim Wilson]

The github.com/sifive/freedom-e-sdk has some examples of how to do
bare metal programming. bsp/libwrap/sys/write.c has code to send
bytes to a uart, which will print them on the serial console. This
should work work the sifive_e machine, but may or may not work with
the spike machine depending on what UART it supports.

Jim

[jimmy li]

you could call a "write syscall", and the riscv-fesvr will help you print it on the console.

ref  https://github.com/riscv/riscv-tests/blob/master/benchmarks/common/syscalls.c 

在 2018年10月27日星期六 UTC+8下午10:29:46，Junyi Yang写道：