/* $NetBSD: vax1k_exec.c,v 1.20 2024/09/08 09:36:50 rillig 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 NetBSD vax1k exectuables. * * Because NetBSD/vax now uses 4k page size, older binaries (that started * on an 1k boundary) cannot be mmap'ed. Therefore they are read in * (via vn_rdwr) as OMAGIC binaries and executed. This will use a little * bit more memory, but otherwise won't affect the execution speed. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: vax1k_exec.c,v 1.20 2024/09/08 09:36:50 rillig Exp $"); #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 <sys/module.h> #include <compat/vax1k/vax1k_exec.h> #if defined(_KERNEL_OPT) #include "opt_compat_43.h" #else #define COMPAT_43 /* enable 4.3BSD binaries for lkm */ #endif MODULE(MODULE_CLASS_EXEC, exec_vax1k, NULL); int exec_vax1k_prep_anymagic(struct lwp *, struct exec_package *, size_t, bool); static struct execsw exec_vax1k_execsw = { /* NetBSD vax1k a.out */ .es_hdrsz = sizeof(struct exec), .es_makecmds = exec_vax1k_makecmds, .u = { .elf_probe_func = NULL, }, .es_emul = &emul_netbsd, .es_prio = EXECSW_PRIO_ANY, .es_arglen = 0, .es_copyargs = copyargs, .es_setregs = NULL, .es_coredump = coredump_netbsd, .es_setup_stack = exec_setup_stack, }; static int exec_vax1k_modcmd(modcmd_t cmd, void *arg) { switch (cmd) { case MODULE_CMD_INIT: return exec_add(&exec_vax1k_execsw, 1); case MODULE_CMD_FINI: return exec_remove(&exec_vax1k_execsw, 1); default: return ENOTTY; } } /* * exec_vax1k_makecmds(): Check if it's an a.out-format executable * with a vax1k 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_vax1k_makecmds(struct lwp *l, 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_VAX1K << 16) | ZMAGIC: error = exec_vax1k_prep_anymagic(l, epp, 0, false); goto done; case (MID_VAX1K << 16) | NMAGIC: error = exec_vax1k_prep_anymagic(l, epp, sizeof(struct exec), true); goto done; case (MID_VAX1K << 16) | OMAGIC: error = exec_vax1k_prep_anymagic(l, epp, sizeof(struct exec), false); goto done; } #ifdef COMPAT_43 /* * 4.3BSD pre-dates CPU midmag (e.g. MID_VAX1K). instead, we * expect a magic number in native byte order. */ switch (execp->a_midmag) { case ZMAGIC: error = exec_vax1k_prep_anymagic(l, epp, VAX1K_LDPGSZ, false); goto done; case NMAGIC: error = exec_vax1k_prep_anymagic(l, epp, sizeof(struct exec), true); goto done; case OMAGIC: error = exec_vax1k_prep_anymagic(l, epp, sizeof(struct exec), false); goto done; } #endif /* failed... */ error = ENOEXEC; done: if (error) kill_vmcmds(&epp->ep_vmcmds); return error; } /* * exec_vax1k_prep_anymagic(): Prepare a vax1k ?MAGIC binary's exec package * * First, set of the various offsets/lengths in the exec package. * Note that all code is mapped RW; no protection, but because it is * only used for compatibility it won't hurt. * */ int exec_vax1k_prep_anymagic(struct lwp *l, struct exec_package *epp, size_t text_foffset, bool textpad) { struct exec *execp = epp->ep_hdr; epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1); epp->ep_tsize = execp->a_text; epp->ep_daddr = epp->ep_taddr + epp->ep_tsize; if (textpad) /* pad for NMAGIC? */ epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) & ~(VAX1K_LDPGSZ - 1); epp->ep_dsize = execp->a_data; epp->ep_entry = execp->a_entry; /* first allocate memory for text+data+bss */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) - trunc_page(epp->ep_taddr), /* size */ trunc_page(epp->ep_taddr), NULLVP, /* addr, vnode */ 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* then read the text in the area we just allocated */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset, VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); /* next read the data */ if (epp->ep_dsize) { NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, epp->ep_dsize, epp->ep_daddr, epp->ep_vp, text_foffset + epp->ep_tsize, VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); } /* now bump up the dsize to include the bss so that sbrk works */ epp->ep_dsize += execp->a_bss; /* finally, setup the stack ... */ return (*epp->ep_esch->es_setup_stack)(l, epp); }
