/* $NetBSD: exec_aout.c,v 1.43 2024/12/06 16:19:41 riastradh 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 __KERNEL_RCSID(0, "$NetBSD: exec_aout.c,v 1.43 2024/12/06 16:19:41 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include MODULE(MODULE_CLASS_EXEC, exec_aout, NULL); static struct execsw exec_aout_execsw = { .es_hdrsz = sizeof(struct exec), .es_makecmds = exec_aout_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_aout_modcmd(modcmd_t cmd, void *arg) { switch (cmd) { case MODULE_CMD_INIT: return exec_add(&exec_aout_execsw, 1); case MODULE_CMD_FINI: return exec_remove(&exec_aout_execsw, 1); default: return SET_ERROR(ENOTTY); } } /* * exec_aout_makecmds(): Check if it's an a.out-format executable. * * Given a lwp 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 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 SET_ERROR(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(l, epp); break; case (MID_MACHINE << 16) | NMAGIC: error = exec_aout_prep_nmagic(l, epp); break; case (MID_MACHINE << 16) | OMAGIC: error = exec_aout_prep_omagic(l, epp); break; default: error = cpu_exec_aout_makecmds(l, epp); } if (error) kill_vmcmds(&epp->ep_vmcmds); else epp->ep_flags &= ~EXEC_TOPDOWN_VM; 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 lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; int error; epp->ep_taddr = AOUT_LDPGSZ; 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, round_page(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, round_page(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 > 0) 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_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's exec package */ int exec_aout_prep_nmagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long bsize, baddr; epp->ep_taddr = AOUT_LDPGSZ; epp->ep_tsize = execp->a_text; epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_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|VM_PROT_EXECUTE); return (*epp->ep_esch->es_setup_stack)(l, epp); } /* * exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's exec package */ int exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long dsize, bsize, baddr; epp->ep_taddr = AOUT_LDPGSZ; 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|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 - round_page(execp->a_text); epp->ep_dsize = (dsize > 0) ? dsize : 0; return (*epp->ep_esch->es_setup_stack)(l, epp); }