/*- * 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 1.3 1995/11/06 12:52:23 davidg Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include extern int exec_linux_imgact __P((struct image_params *iparams)); int exec_linux_imgact(imgp) struct image_params *imgp; { struct exec *a_out = (struct exec *) imgp->image_header; struct vmspace *vmspace = imgp->proc->p_vmspace; unsigned long vmaddr, virtual_offset, file_offset; unsigned long buffer, bss_size; int error; 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 > imgp->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 > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) return (ENOMEM); /* copy in arguments and/or environment from old process */ error = exec_extract_strings(imgp); if (error) return (error); /* * Destroy old process VM and create a new one (with a new stack) */ exec_new_vmspace(imgp); /* * 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) imgp->vp, 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) imgp->vp, 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)imgp->vp, 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)imgp->vp, 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); } /* Indicate that this file should not be modified */ imgp->vp->v_flag |= VTEXT; } /* 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 */ imgp->interpreted = 0; imgp->entry_addr = a_out->a_entry; imgp->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);