/* $OpenBSD: exec_aout.c,v 1.10 2005/11/12 04:31:24 jsg Exp $ */ /* $NetBSD: exec_aout.c,v 1.14 1996/02/04 02:15:01 christos 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/exec.h> #include <sys/resourcevar.h> #include <uvm/uvm_extern.h> #if defined(_KERN_DO_AOUT) #if defined(COMPAT_AOUT) void aout_compat_setup(struct exec_package *epp); #endif /* * exec_aout_makecmds(): Check if it's an a.out-format executable. * * Given a proc pointer and an exec package pointer, see if the referent * of the epp is in a.out format. First check 'standard' magic numbers for * this architecture. If that fails, try a cpu-dependent hook. * * This function, in the former case, or the hook, in the latter, is * responsible for creating a set of vmcmds which can be used to build * the process's vm space and inserting them into the exec package. */ int exec_aout_makecmds(struct proc *p, struct exec_package *epp) { u_long midmag, magic; u_short mid; int error; struct exec *execp = epp->ep_hdr; if (epp->ep_hdrvalid < sizeof(struct exec)) return ENOEXEC; midmag = ntohl(execp->a_midmag); mid = (midmag >> 16) & 0x3ff; magic = midmag & 0xffff; midmag = mid << 16 | magic; switch (midmag) { case (MID_MACHINE << 16) | ZMAGIC: error = exec_aout_prep_zmagic(p, epp); break; case (MID_MACHINE << 16) | NMAGIC: error = exec_aout_prep_nmagic(p, epp); break; case (MID_MACHINE << 16) | OMAGIC: error = exec_aout_prep_omagic(p, epp); break; default: error = cpu_exec_aout_makecmds(p, epp); } if (error) kill_vmcmds(&epp->ep_vmcmds); #ifdef COMPAT_AOUT aout_compat_setup(epp); #endif return error; } /* * exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's exec package * * First, set of the various offsets/lengths in the exec package. * * Then, mark the text image busy (so it can be demand paged) or error * out if this is not possible. Finally, set up vmcmds for the * text, data, bss, and stack segments. */ int exec_aout_prep_zmagic(struct proc *p, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; epp->ep_taddr = USRTEXT; epp->ep_tsize = execp->a_text; epp->ep_daddr = epp->ep_taddr + execp->a_text; epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* * check if vnode is in open for writing, because we want to * demand-page out of it. if it is, don't do it, for various * reasons */ if ((execp->a_text != 0 || execp->a_data != 0) && epp->ep_vp->v_writecount != 0) { #ifdef DIAGNOSTIC if (epp->ep_vp->v_flag & VTEXT) panic("exec: a VTEXT vnode has writecount != 0"); #endif return ETXTBSY; } vn_marktext(epp->ep_vp); /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, epp->ep_daddr, epp->ep_vp, execp->a_text, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, epp->ep_daddr + execp->a_data, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE); return exec_setup_stack(p, epp); } /* * exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's exec package */ int exec_aout_prep_nmagic(struct proc *p, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long bsize, baddr; epp->ep_taddr = USRTEXT; epp->ep_tsize = execp->a_text; epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, epp->ep_taddr, epp->ep_vp, sizeof(struct exec), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ baddr = round_page(epp->ep_daddr + execp->a_data); bsize = epp->ep_daddr + epp->ep_dsize - baddr; if (bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE); return exec_setup_stack(p, epp); } /* * exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's exec package */ int exec_aout_prep_omagic(struct proc *p, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long dsize, bsize, baddr; epp->ep_taddr = USRTEXT; epp->ep_tsize = execp->a_text; epp->ep_daddr = epp->ep_taddr + execp->a_text; epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* set up command for text and data segments */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ baddr = round_page(epp->ep_daddr + execp->a_data); bsize = epp->ep_daddr + epp->ep_dsize - baddr; if (bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE); /* * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' * respectively to page boundaries. * Compensate `ep_dsize' for the amount of data covered by the last * text page. */ dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text); epp->ep_dsize = (dsize > 0) ? dsize : 0; return exec_setup_stack(p, epp); } #endif /* _KERN_DO_AOUT */