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Message
From: Aitor Garay-Romero<terminaaitor@g...>
Date: Fri May 20 18:05:52 CEST 2005
Subject: [openrisc] using stdio.h functions with or1ksim
Hi there!, I'm trying to profile a simple program under or1ksim. The program
makes use of fopen/fread/fclose to get data from a file.
I'm linking the application with newlib. The fopen/fread/fclose
symbols get resolved by the linker, but a lot of other external symbols
from newlib remain unresolved. The unresolved symbols look like
_lseek_r, _read_r, _sbrk_r, _fstat_r, ... I assume that those functions
must be provided by some OS, for example uclinux. But, is there a
library that with the support of or1ksim can provide that functionality?
I have tried to implement those symbols with 'l.sys' instructions
(using the syscall numbers from uclib/uclinux), but the or1ksim simply
jumps to the SYSCALL vector address, and there is nothing there... ;-)
I also have looked to the or1ksim source to see if it emulates the
syscalls but found nothing (there seems to be an obsolete #define
ONLY_VIRTUAL_MACHINE).
So, in summary: is there an easy way to use
fopen/fread/fclose/printf/... under or1ksim? One way i see is to
somehow communicate with the outside world via the emulated serial port
of or1ksim, but that's not trivial...
Thanks!,
/AITOR
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