2.9BSD/usr/man/man2/fetchi.2

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.TH FETCHI 2
.UC
.SH NAME
fetchi \- fetch from user I-space
.SH SYNOPSIS
.B fetchi(addr)
.br
.B int *addr;
.SH DESCRIPTION
.I Fetchi
fetches the word at
.I addr
from user I-space.
This system call is required
on machines with separate instruction
and data spaces because the
.I mfpi
instruction reads from
D-space if the current
and previous modes in the
program status word are
both user.
.SH ERRORS
.I Fetchi
will fail if:
.TP 20
[EFAULT]
.I Addr
points to an address not in the process's allocated instruction space.
.SH ASSEMBLER
.nf
(local = 58., fetchi = 8.)
(addr in r0)
.B sys local; 9f
\&. . .
.B \&.data
.B 9: sys fetchi
.fi
.SH BUGS
This is a kludge and exists only to circumvent an alleged
security feature on some DEC processors.