/* $NetBSD: m68k4k_exec.c,v 1.24 2014/03/07 01:33:43 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. */ /* * Exec glue to provide compatibility with older NetBSD 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 PAGE_SIZE == 4096. It's not clear * that making it work on other machines is worth the trouble. */ #include __KERNEL_RCSID(0, "$NetBSD: m68k4k_exec.c,v 1.24 2014/03/07 01:33:43 christos Exp $"); #if !defined(__m68k__) #error YOU GOTTA BE KIDDING! #endif #include #include #include #include #include #include #include #include #include #include #ifdef COREDUMP #define DEP "coredump" #else #define DEP NULL #endif MODULE(MODULE_CLASS_EXEC, exec_m68k4k, DEP); static struct execsw exec_m68k4k_execsw = { .es_hdrsz = sizeof(struct exec), .es_makecmds = exec_m68k4k_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_m68k4k_modcmd(modcmd_t cmd, void *arg) { switch (cmd) { case MODULE_CMD_INIT: return exec_add(&exec_m68k4k_execsw, 1); case MODULE_CMD_FINI: return exec_remove(&exec_m68k4k_execsw, 1); default: return ENOTTY; } } int exec_m68k4k_prep_zmagic(struct lwp *, struct exec_package *); int exec_m68k4k_prep_nmagic(struct lwp *, struct exec_package *); int exec_m68k4k_prep_omagic(struct lwp *, 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(struct lwp *l, 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 != PAGE_SIZE) 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(l, epp); break; case (MID_M68K4K << 16) | NMAGIC: error = exec_m68k4k_prep_nmagic(l, epp); break; case (MID_M68K4K << 16) | OMAGIC: error = exec_m68k4k_prep_omagic(l, 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(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; int error; 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; error = vn_marktext(epp->ep_vp); if (error) return (error); /* 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 */ if (execp->a_bss) 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 (*epp->ep_esch->es_setup_stack)(l, epp); } /* * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package */ int exec_m68k4k_prep_nmagic(struct lwp *l, 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, PAGE_SIZE); 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 (*epp->ep_esch->es_setup_stack)(l, epp); } /* * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package */ int exec_m68k4k_prep_omagic(struct lwp *l, 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, PAGE_SIZE); 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, PAGE_SIZE); epp->ep_dsize = (dsize > 0) ? dsize : 0; return (*epp->ep_esch->es_setup_stack)(l, epp); }