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|
In this file are all changes necessary to implement the 4.3BSD system
call mprotect, and the changes to make sigreturn pass back the address
where a fault occurred as the `code' arg. Note that sun passes the
address as a 4'th arg. This might be preferable, but would involve
changes to locore.s.
This has been tested on an hp370 running 4.3 BSD from MT Xinu.
A man page entry for the call as implemented below.
Inserting file /usr/man/man2/mprotect.2
---Begin File /usr/man/man2/mprotect.2---
.\" @(#)mprotect.2
.TH MPROTECT 2 "9 December 1989"
.SH NAME
mprotect \- specify protection of data section memory
.SH SYNOPSIS
.nf
.ft B
#include <sys/mman.h>
.ft
.LP
.ft B
mprotect(addr, len, prot)
caddr_t addr;
int len, prot;
.ft
.fi
.IX mprotect "" \fLmprotect\fP
.IX "memory management" mprotect "" \fLmprotect\fP
.IX "change protections \(em \fLmprotect\fP"
.SH DESCRIPTION
.LP
.B mprotect(\|)
changes the access protections on the mappings specified
by
the range
[\fIaddr, addr + len\fP\^)
to be that specified by
.IR prot .
Legitimate values for
.I prot
are PROT_READ and (PROT_WRITE | PROT_READ).
.SH RETURN VALUE
.LP
.B mprotect(\|)
returns 0 on success, \-1 on failure.
.SH ERRORS
.B mprotect(\|)
will fail if:
.TP 15
.SM EINVAL
.I addr
is not a multiple of the page size as returned
by
.BR getpagesize (2).
.TP
.SM ENOMEM
Addresses in the range
[\fIaddr, addr + len\fP)
are not in the data section of a process.
.LP
.SH SEE ALSO
.BR getpagesize (2),
---End File /usr/man/man2/mprotect.2---
You need to compile the following and add it to /lib/libc.a
Inserting file /usr/src/lib/libc/hp300/sys/mprotect.c
---Begin File /usr/src/lib/libc/hp300/sys/mprotect.c---
#ifdef SYSLIBC_SCCS
_sccsid:.asciz "@(#)mprotect.c"
#endif SYSLIBC_SCCS
#include "SYS.h"
SYSCALL(mprotect)
rts
---End File /usr/src/lib/libc/hp300/sys/mprotect.c---
*** hp300/machdep.c.orig Tue Aug 29 13:09:56 1989
--- hp300/machdep.c Mon Dec 11 17:07:18 1989
***************
*** 560,566 ****
#endif
sigf.sf_signum = sig;
sigf.sf_code = 0;
! if (sig == SIGILL || sig == SIGFPE) {
sigf.sf_code = u.u_code;
u.u_code = 0;
}
--- 560,566 ----
#endif
sigf.sf_signum = sig;
sigf.sf_code = 0;
! if (sig == SIGILL || sig == SIGFPE || sig == SIGBUS) {
sigf.sf_code = u.u_code;
u.u_code = 0;
}
*** sys/kern_mman.c.orig Tue Aug 29 13:16:29 1989
--- sys/kern_mman.c Thu Dec 14 10:07:39 1989
***************
*** 249,257 ****
u.u_pofile[fd] &= ~UF_MAPPED;
}
mprotect()
! {
}
madvise()
--- 249,296 ----
u.u_pofile[fd] &= ~UF_MAPPED;
}
+
mprotect()
! { struct a {
! caddr_t addr;
! int len;
! int prot;
! } *uap = (struct a *)u.u_ap;
! int fv,off;
! int tprot;
! register struct pte *pte;
! struct cmap *c;
! int s;
+ u.u_r.r_val1 = -1;
+
+ if ((uap->len < 0 ||
+ (int)uap->addr & CLOFSET)) {
+ u.u_error = EINVAL;
+ return;
+ }
+
+
+ if ((uap->prot & PROT_WRITE) == 0)
+ tprot= PG_RO;
+ else tprot=PG_RW;
+ /* check the pages are in data section */
+ if (!(isadsv(u.u_procp, btoc(uap->addr))
+ &&isadsv(u.u_procp ,btoc(uap->addr+uap->len) -1)))
+ { u.u_error = ENOMEM;
+ return;}
+
+
+ fv = btop(uap->addr);
+ pte = vtopte(u.u_procp, fv);
+ for (off = 0; off < uap->len; off += NBPG) {
+
+ *(u_int *)pte &= ~PG_PROT;
+ *(u_int *)pte |= tprot;
+ pte++;}
+
+ newptes(vtopte(u.u_procp, fv), fv, btoc(uap->len));
+ u.u_r.r_val1 = 0;
}
madvise()
*** hp300/trap.c.orig Tue Aug 29 13:09:59 1989
--- hp300/trap.c Mon Dec 11 17:48:59 1989
***************
*** 112,117 ****
--- 112,118 ----
case T_BUSERR+USER: /* bus error */
case T_ADDRERR+USER: /* address error */
+ u.u_code=v;
i = SIGBUS;
break;
***************
*** 293,298 ****
--- 294,300 ----
printf("PTF|WPF...\n");
if (type == T_MMUFLT)
goto copyfault;
+ u.u_code=v;
i = SIGBUS;
break;
}
***************
*** 346,351 ****
--- 348,354 ----
#endif
if (type == T_MMUFLT)
goto copyfault;
+ u.u_code=v;
i = SIGBUS;
break;
}
|
