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/* $NetBSD: exec_subr.c,v 1.9 1994/12/04 03:10:42 mycroft Exp $ */
/*
* Copyright (c) 1993, 1994 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/filedesc.h>
#include <sys/exec.h>
#include <sys/mman.h>
#include <sys/resourcevar.h>
#include <vm/vm.h>
#ifdef DEBUG
/*
* new_vmcmd():
* create a new vmcmd structure and fill in its fields based
* on function call arguments. make sure objects ref'd by
* the vmcmd are 'held'.
*
* If not debugging, this is a macro, so it's expanded inline.
*/
void
new_vmcmd(evsp, proc, len, addr, vp, offset, prot)
struct exec_vmcmd_set *evsp;
int (*proc) __P((struct proc * p, struct exec_vmcmd *));
u_long len;
u_long addr;
struct vnode *vp;
u_long offset;
u_int prot;
{
struct exec_vmcmd *vcp;
if (evsp->evs_used >= evsp->evs_cnt)
vmcmdset_extend(evsp);
vcp = &evsp->evs_cmds[evsp->evs_used++];
vcp->ev_proc = proc;
vcp->ev_len = len;
vcp->ev_addr = addr;
if ((vcp->ev_vp = vp) != NULL)
vref(vp);
vcp->ev_offset = offset;
vcp->ev_prot = prot;
}
#endif /* DEBUG */
void
vmcmdset_extend(evsp)
struct exec_vmcmd_set *evsp;
{
struct exec_vmcmd *nvcp;
u_int ocnt;
#ifdef DIAGNOSTIC
if (evsp->evs_used < evsp->evs_cnt)
panic("vmcmdset_extend: not necessary");
#endif
/* figure out number of entries in new set */
ocnt = evsp->evs_cnt;
evsp->evs_cnt += ocnt ? ocnt : EXEC_DEFAULT_VMCMD_SETSIZE;
/* allocate it */
MALLOC(nvcp, struct exec_vmcmd *,
(evsp->evs_cnt * sizeof(struct exec_vmcmd)), M_EXEC, M_WAITOK);
/* free the old struct, if there was one, and record the new one */
if (ocnt) {
bcopy(evsp->evs_cmds, nvcp, (ocnt * sizeof(struct exec_vmcmd)));
FREE(evsp->evs_cmds, M_EXEC);
}
evsp->evs_cmds = nvcp;
}
void
kill_vmcmds(evsp)
struct exec_vmcmd_set *evsp;
{
struct exec_vmcmd *vcp;
int i;
if (evsp->evs_cnt == 0)
return;
for (i = 0; i < evsp->evs_used; i++) {
vcp = &evsp->evs_cmds[i];
if (vcp->ev_vp != NULLVP)
vrele(vcp->ev_vp);
}
evsp->evs_used = evsp->evs_cnt = 0;
FREE(evsp->evs_cmds, M_EXEC);
}
/*
* vmcmd_map_pagedvn():
* handle vmcmd which specifies that a vnode should be mmap'd.
* appropriate for handling demand-paged text and data segments.
*/
int
vmcmd_map_pagedvn(p, cmd)
struct proc *p;
struct exec_vmcmd *cmd;
{
/*
* note that if you're going to map part of an process as being
* paged from a vnode, that vnode had damn well better be marked as
* VTEXT. that's handled in the routine which sets up the vmcmd to
* call this routine.
*/
return vm_mmap(&p->p_vmspace->vm_map, &cmd->ev_addr, cmd->ev_len,
cmd->ev_prot, VM_PROT_ALL, MAP_FIXED|MAP_COPY, (caddr_t)cmd->ev_vp,
cmd->ev_offset);
}
/*
* vmcmd_map_readvn():
* handle vmcmd which specifies that a vnode should be read from.
* appropriate for non-demand-paged text/data segments, i.e. impure
* objects (a la OMAGIC and NMAGIC).
*/
int
vmcmd_map_readvn(p, cmd)
struct proc *p;
struct exec_vmcmd *cmd;
{
int error;
error = vm_allocate(&p->p_vmspace->vm_map, &cmd->ev_addr,
cmd->ev_len, 0);
if (error)
return error;
error = vn_rdwr(UIO_READ, cmd->ev_vp, (caddr_t)cmd->ev_addr,
cmd->ev_len, cmd->ev_offset, UIO_USERSPACE, IO_UNIT|IO_NODELOCKED,
p->p_ucred, (int *)0, p);
if (error)
return error;
return vm_map_protect(&p->p_vmspace->vm_map, trunc_page(cmd->ev_addr),
round_page(cmd->ev_addr + cmd->ev_len), cmd->ev_prot, FALSE);
}
/*
* vmcmd_map_zero():
* handle vmcmd which specifies a zero-filled address space region. The
* address range must be first allocated, then protected appropriately.
*/
int
vmcmd_map_zero(p, cmd)
struct proc *p;
struct exec_vmcmd *cmd;
{
int error;
error = vm_allocate(&p->p_vmspace->vm_map, &cmd->ev_addr,
cmd->ev_len, 0);
if (error)
return error;
return vm_map_protect(&p->p_vmspace->vm_map, trunc_page(cmd->ev_addr),
round_page(cmd->ev_addr + cmd->ev_len), cmd->ev_prot, FALSE);
}
/*
* exec_setup_stack(): Set up the stack segment for an a.out
* executable.
*
* Note that the ep_ssize parameter must be set to be the current stack
* limit; this is adjusted in the body of execve() to yield the
* appropriate stack segment usage once the argument length is
* calculated.
*
* This function returns an int for uniformity with other (future) formats'
* stack setup functions. They might have errors to return.
*/
int
exec_setup_stack(p, epp)
struct proc *p;
struct exec_package *epp;
{
epp->ep_maxsaddr = USRSTACK - MAXSSIZ;
epp->ep_minsaddr = USRSTACK;
epp->ep_ssize = round_page(p->p_rlimit[RLIMIT_STACK].rlim_cur);
/*
* set up commands for stack. note that this takes *two*, one to
* map the part of the stack which we can access, and one to map
* the part which we can't.
*
* arguably, it could be made into one, but that would require the
* addition of another mapping proc, which is unnecessary
*
* note that in memory, things assumed to be: 0 ....... ep_maxsaddr
* <stack> ep_minsaddr
*/
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE);
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
(epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
return 0;
}
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