diff options
Diffstat (limited to 'sys/kern/imgact_aout.c')
| -rw-r--r-- | sys/kern/imgact_aout.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c new file mode 100644 index 0000000..fcd7af5 --- /dev/null +++ b/sys/kern/imgact_aout.c @@ -0,0 +1,193 @@ +/* + * Copyright (c) 1993, David Greenman + * 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 David Greenman + * 4. The name of the developer may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + * + * $Id: imgact_aout.c,v 1.6 1994/08/18 22:34:55 wollman Exp $ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/resourcevar.h> +#include <sys/exec.h> +#include <sys/mman.h> +#include <sys/imgact.h> +#include <sys/kernel.h> +#include <sys/sysent.h> + +#include <vm/vm.h> + +int +exec_aout_imgact(iparams) + struct image_params *iparams; +{ + struct exec *a_out = (struct exec *) iparams->image_header; + struct vmspace *vmspace = iparams->proc->p_vmspace; + unsigned long vmaddr, virtual_offset, file_offset; + unsigned long bss_size; + int error, len; + extern struct sysentvec aout_sysvec; + + /* + * Set file/virtual offset based on a.out variant. + * We do two cases: host byte order and network byte order + * (for NetBSD compatibility) + */ + switch ((int)(a_out->a_magic & 0xffff)) { + case ZMAGIC: + virtual_offset = 0; + if (a_out->a_text) { + file_offset = NBPG; + } else { + /* Bill's "screwball mode" */ + file_offset = 0; + } + break; + case QMAGIC: + virtual_offset = NBPG; + file_offset = 0; + break; + default: + /* NetBSD compatibility */ + switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { + case ZMAGIC: + case QMAGIC: + virtual_offset = NBPG; + file_offset = 0; + break; + default: + return (-1); + } + } + + bss_size = roundup(a_out->a_bss, NBPG); + + /* + * Check various fields in header for validity/bounds. + */ + if (/* entry point must lay with text region */ + a_out->a_entry < virtual_offset || + a_out->a_entry >= virtual_offset + a_out->a_text || + + /* text and data size must each be page rounded */ + a_out->a_text % NBPG || + a_out->a_data % NBPG) + return (-1); + + /* text + data can't exceed file size */ + if (a_out->a_data + a_out->a_text > iparams->attr->va_size) + return (EFAULT); + + /* + * text/data/bss must not exceed limits + */ + if (/* text can't exceed maximum text size */ + a_out->a_text > MAXTSIZ || + + /* data + bss can't exceed maximum data size */ + a_out->a_data + bss_size > MAXDSIZ || + + /* data + bss can't exceed rlimit */ + a_out->a_data + bss_size > + iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur) + return (ENOMEM); + + /* copy in arguments and/or environment from old process */ + error = exec_extract_strings(iparams); + if (error) + return (error); + + /* + * Destroy old process VM and create a new one (with a new stack) + */ + exec_new_vmspace(iparams); + + /* + * Map text read/execute + */ + vmaddr = virtual_offset; + error = + vm_mmap(&vmspace->vm_map, /* map */ + &vmaddr, /* address */ + a_out->a_text, /* size */ + VM_PROT_READ | VM_PROT_EXECUTE, /* protection */ + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* max protection */ + MAP_PRIVATE | MAP_FIXED, /* flags */ + (caddr_t)iparams->vnodep, /* vnode */ + file_offset); /* offset */ + if (error) + return (error); + + /* + * Map data read/write (if text is 0, assume text is in data area + * [Bill's screwball mode]) + */ + vmaddr = virtual_offset + a_out->a_text; + error = + vm_mmap(&vmspace->vm_map, + &vmaddr, + a_out->a_data, + VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE), + VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, + (caddr_t) iparams->vnodep, + file_offset + a_out->a_text); + if (error) + return (error); + + /* + * Allocate demand-zeroed area for uninitialized data + * "bss" = 'block started by symbol' - named after the IBM 7090 + * instruction of the same name. + */ + vmaddr = virtual_offset + a_out->a_text + a_out->a_data; + error = vm_allocate(&vmspace->vm_map, &vmaddr, bss_size, FALSE); + if (error) + return (error); + + /* Fill in process VM information */ + vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; + vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; + vmspace->vm_taddr = (caddr_t) virtual_offset; + vmspace->vm_daddr = (caddr_t) virtual_offset + a_out->a_text; + + /* Fill in image_params */ + iparams->interpreted = 0; + iparams->entry_addr = a_out->a_entry; + + iparams->proc->p_sysent = &aout_sysvec; + return (0); +} + +/* + * Tell kern_execve.c about it, with a little help from the linker. + * Since `const' objects end up in the text segment, TEXT_SET is the + * correct directive to use. + */ +static const struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; +TEXT_SET(execsw_set, aout_execsw); + |
