SE mode does not work at the standard library level, it works at the system call level. As long as your custom standard library uses the normal linux system calls and the normal linux system call ABI, you shouldn't have to do anything special. There could be a very minor technical exception on x86 where on a real system the kernel has to provide tiny helpers since there are 3 different ways to call system calls (int, sysenter, syscall) and the program doesn't have a good/efficient way to know which to use. Those are built into gem5 in assembly and loaded into memory as the program is set up, but I don't think RISCV does anything like that since it doesn't have all the baggage x86 does.
Gabe On Thu, Jan 14, 2021 at 12:47 AM jan.thoma--- via gem5-users < gem5-users@gem5.org> wrote: > Hi all, > > I am a little stuck and would appreciate if someone could help. I am > simulating in Gem5 syscall emulation mode and I've made some modifications > to the CPU model to support some additional instructions (RISC-V). To > compile programs using the new instructions, I also have a clang compiler > that places the instructions. It is important that *every* piece of code > that is executed on the core goes through my own compiler. I compiled > Newlib > for libc support. Unfortunately, the _write() function (that is, the > function that executes the syscall) has to be implemented manually. Is > there > a way to print to stdout in syscall emulation mode where I compile the libc > myself? What would the _write() function have to implement? Is there any > other way to print during simulation? > > From other platforms I am used to solutions like "write at a specific > address" but I couldn't find anything like that for Gem5. I realize that > the > problem is very unusual, I would appreciate any help. Thanks! > > Best, > Jan > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s >
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