/*
* Copyright (c) 1993, 1994, 1996 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.
*/
#ifdef DEBUG_STACK
#define DPRINTF(a) uprintf a
#else
#define DPRINTF(a)
#endif
unsigned int user_stack_guard_size = 1024 * 1024;
unsigned int user_thread_stack_guard_size = 64 * 1024;
/*
* 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'.
*/
#ifdef DIAGNOSTIC
if (evsp->evs_used < evsp->evs_cnt)
panic("vmcmdset_extend: not necessary");
#endif
/* figure out number of entries in new set */
if ((ocnt = evsp->evs_cnt) != 0) {
evsp->evs_cnt += ocnt;
VMCMD_EVCNT_INCR(extends);
} else
evsp->evs_cnt = EXEC_DEFAULT_VMCMD_SETSIZE;
/* free the old struct, if there was one, and record the new one */
if (ocnt) {
memcpy(nvcp, evsp->evs_cmds,
(ocnt * sizeof(struct exec_vmcmd)));
kmem_free(evsp->evs_cmds, ocnt * sizeof(struct exec_vmcmd));
}
evsp->evs_cmds = nvcp;
}
for (i = 0; i < evsp->evs_used; i++) {
vcp = &evsp->evs_cmds[i];
if (vcp->ev_vp != NULL)
vrele(vcp->ev_vp);
}
kmem_free(evsp->evs_cmds, evsp->evs_cnt * sizeof(struct exec_vmcmd));
evsp->evs_used = evsp->evs_cnt = 0;
}
/*
* vmcmd_map_pagedvn():
* handle vmcmd which specifies that a vnode should be mmap'd.
* appropriate for handling demand-paged text and data segments.
*/
/*
* 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(struct lwp *l, struct exec_vmcmd *cmd)
{
struct proc *p = l->l_proc;
int error;
long diff;
#ifdef PMAP_NEED_PROCWR
/*
* we had to write the process, make sure the pages are synched
* with the instruction cache.
*/
if (prot & VM_PROT_EXECUTE)
pmap_procwr(p, cmd->ev_addr, cmd->ev_len);
#endif
/*
* we had to map in the area at PROT_ALL so that vn_rdwr()
* could write to it. however, the caller seems to want
* it mapped read-only, so now we are going to have to call
* uvm_map_protect() to fix up the protection. ICK.
*/
if (maxprot != VM_PROT_ALL) {
error = uvm_map_protect(&p->p_vmspace->vm_map,
trunc_page(cmd->ev_addr),
round_page(cmd->ev_addr + cmd->ev_len),
maxprot, true);
if (error)
return error;
}
if (prot != maxprot) {
error = uvm_map_protect(&p->p_vmspace->vm_map,
trunc_page(cmd->ev_addr),
round_page(cmd->ev_addr + cmd->ev_len),
prot, false);
if (error)
return error;
}
return 0;
}
/*
* 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(struct lwp *l, struct exec_vmcmd *cmd)
{
struct proc *p = l->l_proc;
int error;
long diff;
vm_prot_t prot, maxprot;
if ((error = vn_rdwr(UIO_READ, vp, bf, size, off, UIO_SYSSPACE,
ioflg, l->l_cred, &resid, NULL)) != 0)
return error;
/*
* See if we got all of it
*/
if (resid != 0)
return SET_ERROR(ENOEXEC);
return 0;
}
/*
* exec_setup_stack(): Set up the stack segment for an elf
* 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.
*/
/*
* 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
*/
access_size = epp->ep_ssize;
access_linear_min = (vaddr_t)STACK_ALLOC(epp->ep_minsaddr, access_size);
noaccess_size = max_stack_size - access_size;
noaccess_linear_min = (vaddr_t)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
access_size), noaccess_size);
