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Diffstat (limited to 'sys/i386/linux/imgact_linux.c')
| -rw-r--r-- | sys/i386/linux/imgact_linux.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/sys/i386/linux/imgact_linux.c b/sys/i386/linux/imgact_linux.c new file mode 100644 index 0000000..d9650d3 --- /dev/null +++ b/sys/i386/linux/imgact_linux.c @@ -0,0 +1,235 @@ +/*- + * Copyright (c) 1994-1995 Søren Schmidt + * All rights reserved. + * + * Based heavily on /sys/kern/imgact_aout.c which is: + * Copyright (c) 1993, David Greenman + * + * 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 + * in this position and unchanged. + * 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. The name of the author may not be used to endorse or promote products + * derived from this software withough 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. + * + * $Id: imgact_linux.c,v 1.2 1995/06/07 21:27:57 sos 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/imgact_aout.h> +#include <sys/kernel.h> +#include <sys/sysent.h> + +#include <vm/vm.h> +#include <vm/vm_kern.h> + +int +exec_linux_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 buffer, bss_size; + int error; + extern struct sysentvec linux_sysvec; + + if (((a_out->a_magic >> 16) & 0xff) != 0x64) + return -1; + + /* + * Set file/virtual offset based on a.out variant. + */ + switch ((int)(a_out->a_magic & 0xffff)) { + case 0413: + virtual_offset = 0; + file_offset = 1024; + break; + case 0314: + virtual_offset = 4096; + file_offset = 0; + break; + default: + return (-1); + } + bss_size = round_page(a_out->a_bss); + + /* + * Check various fields in header for validity/bounds. + */ + if (a_out->a_entry < virtual_offset || + a_out->a_entry >= virtual_offset + a_out->a_text || + 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 (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ || + 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); + + /* + * Check if file_offset page aligned,. + * Currently we cannot handle misalinged file offsets, + * and so we read in the entire image (what a waste). + */ + if (file_offset & PGOFSET) { +#ifdef DEBUG + printf("imgact: Non page aligned binary %d\n", file_offset); +#endif + /* + * Map text read/execute + */ + vmaddr = virtual_offset; + error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, + round_page(a_out->a_text), FALSE); + if (error) + return error; + + error = vm_mmap(kernel_map, &buffer, + round_page(a_out->a_text + file_offset), + VM_PROT_READ, VM_PROT_READ, MAP_FILE, + (caddr_t) iparams->vnodep, trunc_page(file_offset)); + if (error) + return error; + + error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, + a_out->a_text); + if (error) + return error; + + vm_map_remove(kernel_map, trunc_page(vmaddr), + round_page(a_out->a_text + file_offset)); + + error = vm_map_protect(&vmspace->vm_map, vmaddr, + round_page(a_out->a_text), + VM_PROT_EXECUTE|VM_PROT_READ, TRUE); + if (error) + return error; + /* + * Map data read/write + */ + vmaddr = virtual_offset + a_out->a_text; + error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, + round_page(a_out->a_data + bss_size), FALSE); + if (error) + return error; + + error = vm_mmap(kernel_map, &buffer, + round_page(a_out->a_data + file_offset), + VM_PROT_READ, VM_PROT_READ, MAP_FILE, + (caddr_t) iparams->vnodep, + trunc_page(a_out->a_text + file_offset)); + if (error) + return error; + + error = copyout((caddr_t)(buffer + file_offset), + (caddr_t)vmaddr, + a_out->a_data); + if (error) + return error; + + vm_map_remove(kernel_map, trunc_page(vmaddr), + round_page(a_out->a_data + file_offset)); + + error = vm_map_protect(&vmspace->vm_map, vmaddr, + round_page(a_out->a_data + bss_size), + VM_PROT_WRITE|VM_PROT_READ, TRUE); + if (error) + return error; + } + else { +#ifdef DEBUG + printf("imgact: Page aligned binary %d\n", file_offset); +#endif + /* + * Map text read/execute + */ + vmaddr = virtual_offset; + error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_text, + VM_PROT_READ | VM_PROT_EXECUTE, + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, + MAP_PRIVATE | MAP_FIXED, + (caddr_t)iparams->vnodep, file_offset); + if (error) + return (error); + + /* + * Map data read/write + */ + vmaddr = virtual_offset + a_out->a_text; + error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_data, + VM_PROT_READ | VM_PROT_WRITE, + 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 + */ + if (bss_size != 0) { + vmaddr = virtual_offset + a_out->a_text + a_out->a_data; + error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, + bss_size, FALSE); + if (error) + return (error); + } + } + /* Fill in process VM information */ + vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT; + vmspace->vm_dsize = round_page(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 = &linux_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. + */ +const struct execsw linux_execsw = { exec_linux_imgact, "linux" }; +TEXT_SET(execsw_set, linux_execsw); + |
