/* $OpenBSD: exec_subr.c,v 1.24 2002/12/19 00:57:07 mickey Exp $ */ /* $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 #include #include #include #include #include #include #include #include #include #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, flags) struct exec_vmcmd_set *evsp; int (*proc)(struct proc * p, struct exec_vmcmd *); u_long len; u_long addr; struct vnode *vp; u_long offset; u_int prot; int flags; { 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; vcp->ev_flags = flags; } #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 ocnt = evsp->evs_cnt; KASSERT(ocnt > 0); /* figure out number of entries in new set */ evsp->evs_cnt += ocnt; /* reallocate the command set */ nvcp = malloc(evsp->evs_cnt * sizeof(struct exec_vmcmd), M_EXEC, M_WAITOK); bcopy(evsp->evs_cmds, nvcp, (ocnt * sizeof(struct exec_vmcmd))); if (evsp->evs_cmds != evsp->evs_start) free(evsp->evs_cmds, M_EXEC); evsp->evs_cmds = nvcp; } void kill_vmcmds(struct exec_vmcmd_set *evsp) { struct exec_vmcmd *vcp; int i; for (i = 0; i < evsp->evs_used; i++) { vcp = &evsp->evs_cmds[i]; if (vcp->ev_vp != NULLVP) vrele(vcp->ev_vp); } /* * Free old vmcmds and restet the array. */ evsp->evs_used = 0; if (evsp->evs_cmds != evsp->evs_start) free(evsp->evs_cmds, M_EXEC); evsp->evs_cmds = evsp->evs_start; evsp->evs_cnt = EXEC_DEFAULT_VMCMD_SETSIZE; } int exec_process_vmcmds(struct proc *p, struct exec_package *epp) { struct exec_vmcmd *base_vc = NULL; int error = 0; int i; for (i = 0; i < epp->ep_vmcmds.evs_used && !error; i++) { struct exec_vmcmd *vcp; vcp = &epp->ep_vmcmds.evs_cmds[i]; if (vcp->ev_flags & VMCMD_RELATIVE) { #ifdef DIAGNOSTIC if (base_vc == NULL) panic("exec_process_vmcmds: RELATIVE no base"); #endif vcp->ev_addr += base_vc->ev_addr; } error = (*vcp->ev_proc)(p, vcp); if (vcp->ev_flags & VMCMD_BASE) { base_vc = vcp; } } kill_vmcmds(&epp->ep_vmcmds); return (error); } /* * 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. */ struct uvm_object *uobj; int error; /* * map the vnode in using uvm_map. */ if (cmd->ev_len == 0) return(0); if (cmd->ev_offset & PAGE_MASK) return(EINVAL); if (cmd->ev_addr & PAGE_MASK) return(EINVAL); if (cmd->ev_len & PAGE_MASK) return(EINVAL); /* * first, attach to the object */ uobj = uvn_attach((void *) cmd->ev_vp, VM_PROT_READ|VM_PROT_EXECUTE); if (uobj == NULL) return(ENOMEM); /* * do the map */ error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, cmd->ev_len, uobj, cmd->ev_offset, 0, UVM_MAPFLAG(cmd->ev_prot, VM_PROT_ALL, UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_COPYONW|UVM_FLAG_FIXED)); /* * check for error */ if (error) { /* * error: detach from object */ uobj->pgops->pgo_detach(uobj); } return (error); } /* * 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; if (cmd->ev_len == 0) return (0); cmd->ev_addr = trunc_page(cmd->ev_addr); /* required by uvm_map */ error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 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, NULL, p); if (error) return (error); if (cmd->ev_prot != (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)) { /* * 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. */ return (uvm_map_protect(&p->p_vmspace->vm_map, trunc_page(cmd->ev_addr), round_page(cmd->ev_addr + cmd->ev_len), cmd->ev_prot, FALSE)); } 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(p, cmd) struct proc *p; struct exec_vmcmd *cmd; { int error; if (cmd->ev_len == 0) return (0); cmd->ev_addr = trunc_page(cmd->ev_addr); /* required by uvm_map */ error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(cmd->ev_prot, UVM_PROT_ALL, UVM_INH_COPY, UVM_ADV_NORMAL, UVM_FLAG_FIXED|UVM_FLAG_COPYONW)); if (error) return error; return (0); } /* * 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; { #ifdef MACHINE_STACK_GROWS_UP epp->ep_maxsaddr = USRSTACK; epp->ep_minsaddr = USRSTACK + MAXSSIZ; #else epp->ep_maxsaddr = USRSTACK - MAXSSIZ; epp->ep_minsaddr = USRSTACK; #endif 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 * ep_minsaddr */ #ifdef MACHINE_STACK_GROWS_UP NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), epp->ep_maxsaddr + epp->ep_ssize, NULLVP, 0, VM_PROT_NONE); NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, epp->ep_maxsaddr, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE); #else 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); #endif return 0; }