diff options
Diffstat (limited to 'sys/compat/m68k4k/m68k4k_exec.c')
| -rw-r--r-- | sys/compat/m68k4k/m68k4k_exec.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/sys/compat/m68k4k/m68k4k_exec.c b/sys/compat/m68k4k/m68k4k_exec.c new file mode 100644 index 00000000000..a975d013c2c --- /dev/null +++ b/sys/compat/m68k4k/m68k4k_exec.c @@ -0,0 +1,256 @@ +/* $OpenBSD: m68k4k_exec.c,v 1.1 1997/01/13 11:07:52 niklas Exp $ */ +/* $NetBSD: m68k4k_exec.c,v 1.1 1996/09/10 22:01:20 thorpej 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. + */ + +/* + * Exec glue to provide compatibility with older {Net,Open}BSD m68k4k + * exectuables. + * + * Taken directly from kern/exec_aout.c and frobbed to map text and + * data as m68k4k executables expect. + * + * This module only works on machines with NBPG == 4096. It's not clear + * that making it work on other machines is worth the trouble. + */ + +#if !defined(__m68k__) +#error YOU GOTTA BE KIDDING! +#endif + +#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 <vm/vm.h> + +#include <compat/m68k4k/m68k4k_exec.h> + +int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *)); +int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *)); +int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *)); + +/* + * exec_m68k4k_makecmds(): Check if it's an a.out-format executable + * with an m68k4k magic number. + * + * Given a proc pointer and an exec package pointer, see if the referent + * of the epp is in a.out format. Just check 'standard' magic numbers for + * this architecture. + * + * 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_m68k4k_makecmds(p, epp) + struct proc *p; + struct exec_package *epp; +{ + u_long midmag, magic; + u_short mid; + int error; + struct exec *execp = epp->ep_hdr; + + /* See note above... */ + if (M68K4K_LDPGSZ != NBPG) + return ENOEXEC; + + 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_M68K4K << 16) | ZMAGIC: + error = exec_m68k4k_prep_zmagic(p, epp); + break; + case (MID_M68K4K << 16) | NMAGIC: + error = exec_m68k4k_prep_nmagic(p, epp); + break; + case (MID_M68K4K << 16) | OMAGIC: + error = exec_m68k4k_prep_omagic(p, epp); + break; + default: + error = ENOEXEC; + } + + if (error) + kill_vmcmds(&epp->ep_vmcmds); + + return error; +} + +/* + * exec_m68k4k_prep_zmagic(): Prepare an m68k4k 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_m68k4k_prep_zmagic(p, epp) + struct proc *p; + struct exec_package *epp; +{ + struct exec *execp = epp->ep_hdr; + + epp->ep_taddr = M68K4K_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\n"); +#endif + return ETXTBSY; + } + epp->ep_vp->v_flag |= VTEXT; + + /* 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|VM_PROT_EXECUTE); + + return exec_setup_stack(p, epp); +} + +/* + * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package + */ + +int +exec_m68k4k_prep_nmagic(p, epp) + struct proc *p; + struct exec_package *epp; +{ + struct exec *execp = epp->ep_hdr; + long bsize, baddr; + + epp->ep_taddr = M68K4K_USRTEXT; + epp->ep_tsize = execp->a_text; + epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, + M68K4K_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 = roundup(epp->ep_daddr + execp->a_data, NBPG); + 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|VM_PROT_EXECUTE); + + return exec_setup_stack(p, epp); +} + +/* + * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package + */ + +int +exec_m68k4k_prep_omagic(p, epp) + struct proc *p; + struct exec_package *epp; +{ + struct exec *execp = epp->ep_hdr; + long dsize, bsize, baddr; + + epp->ep_taddr = M68K4K_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 = roundup(epp->ep_daddr + execp->a_data, NBPG); + 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|VM_PROT_EXECUTE); + + /* + * 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 - roundup(execp->a_text, NBPG); + epp->ep_dsize = (dsize > 0) ? dsize : 0; + return exec_setup_stack(p, epp); +} |