linux_uselib.c revision 1.1.2.2
1 1.1.2.2 bouyer /* $NetBSD: linux_uselib.c,v 1.1.2.2 2000/12/08 09:08:31 bouyer Exp $ */ 2 1.1.2.2 bouyer 3 1.1.2.2 bouyer /*- 4 1.1.2.2 bouyer * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 1.1.2.2 bouyer * All rights reserved. 6 1.1.2.2 bouyer * 7 1.1.2.2 bouyer * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 bouyer * by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz. 9 1.1.2.2 bouyer * 10 1.1.2.2 bouyer * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 bouyer * modification, are permitted provided that the following conditions 12 1.1.2.2 bouyer * are met: 13 1.1.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 bouyer * documentation and/or other materials provided with the distribution. 18 1.1.2.2 bouyer * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 bouyer * must display the following acknowledgement: 20 1.1.2.2 bouyer * This product includes software developed by the NetBSD 21 1.1.2.2 bouyer * Foundation, Inc. and its contributors. 22 1.1.2.2 bouyer * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 bouyer * contributors may be used to endorse or promote products derived 24 1.1.2.2 bouyer * from this software without specific prior written permission. 25 1.1.2.2 bouyer * 26 1.1.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 bouyer * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 bouyer * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 bouyer * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 bouyer * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 bouyer * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 bouyer * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 bouyer * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 bouyer * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 bouyer * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 bouyer * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 bouyer */ 38 1.1.2.2 bouyer 39 1.1.2.2 bouyer #include <sys/param.h> 40 1.1.2.2 bouyer #include <sys/systm.h> 41 1.1.2.2 bouyer #include <sys/kernel.h> 42 1.1.2.2 bouyer #include <sys/proc.h> 43 1.1.2.2 bouyer #include <sys/malloc.h> 44 1.1.2.2 bouyer #include <sys/namei.h> 45 1.1.2.2 bouyer #include <sys/vnode.h> 46 1.1.2.2 bouyer #include <sys/mount.h> 47 1.1.2.2 bouyer #include <sys/exec.h> 48 1.1.2.2 bouyer #include <sys/exec_elf.h> 49 1.1.2.2 bouyer 50 1.1.2.2 bouyer #include <sys/mman.h> 51 1.1.2.2 bouyer #include <sys/syscallargs.h> 52 1.1.2.2 bouyer 53 1.1.2.2 bouyer #include <machine/cpu.h> 54 1.1.2.2 bouyer #include <machine/reg.h> 55 1.1.2.2 bouyer 56 1.1.2.2 bouyer #include <compat/linux/common/linux_types.h> 57 1.1.2.2 bouyer #include <compat/linux/common/linux_signal.h> 58 1.1.2.2 bouyer #include <compat/linux/common/linux_util.h> 59 1.1.2.2 bouyer #include <compat/linux/common/linux_exec.h> 60 1.1.2.2 bouyer #include <compat/linux/common/linux_machdep.h> 61 1.1.2.2 bouyer 62 1.1.2.2 bouyer #include <compat/linux/linux_syscallargs.h> 63 1.1.2.2 bouyer #include <compat/linux/linux_syscall.h> 64 1.1.2.2 bouyer 65 1.1.2.2 bouyer /* 66 1.1.2.2 bouyer * The Linux system call to load shared libraries, a.out version. The 67 1.1.2.2 bouyer * a.out shared libs are just files that are mapped onto a fixed 68 1.1.2.2 bouyer * address in the process' address space. The address is given in 69 1.1.2.2 bouyer * a_entry. Read in the header, set up some VM commands and run them. 70 1.1.2.2 bouyer * 71 1.1.2.2 bouyer * Yes, both text and data are mapped at once, so we're left with 72 1.1.2.2 bouyer * writeable text for the shared libs. The Linux crt0 seemed to break 73 1.1.2.2 bouyer * sometimes when data was mapped seperately. It munmapped a uselib() 74 1.1.2.2 bouyer * of ld.so by hand, which failed with shared text and data for ld.so 75 1.1.2.2 bouyer * Yuck. 76 1.1.2.2 bouyer * 77 1.1.2.2 bouyer * Because of the problem with ZMAGIC executables (text starts 78 1.1.2.2 bouyer * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC 79 1.1.2.2 bouyer * shared libs are not handled very efficiently :-( 80 1.1.2.2 bouyer */ 81 1.1.2.2 bouyer 82 1.1.2.2 bouyer int 83 1.1.2.2 bouyer linux_sys_uselib(p, v, retval) 84 1.1.2.2 bouyer struct proc *p; 85 1.1.2.2 bouyer void *v; 86 1.1.2.2 bouyer register_t *retval; 87 1.1.2.2 bouyer { 88 1.1.2.2 bouyer struct linux_sys_uselib_args /* { 89 1.1.2.2 bouyer syscallarg(const char *) path; 90 1.1.2.2 bouyer } */ *uap = v; 91 1.1.2.2 bouyer caddr_t sg; 92 1.1.2.2 bouyer long bsize, dsize, tsize, taddr, baddr, daddr; 93 1.1.2.2 bouyer struct nameidata ni; 94 1.1.2.2 bouyer struct vnode *vp; 95 1.1.2.2 bouyer struct exec hdr; 96 1.1.2.2 bouyer struct exec_vmcmd_set vcset; 97 1.1.2.2 bouyer int i, magic, error; 98 1.1.2.2 bouyer size_t rem; 99 1.1.2.2 bouyer 100 1.1.2.2 bouyer sg = stackgap_init(p->p_emul); 101 1.1.2.2 bouyer CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 102 1.1.2.2 bouyer 103 1.1.2.2 bouyer NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 104 1.1.2.2 bouyer 105 1.1.2.2 bouyer if ((error = namei(&ni))) 106 1.1.2.2 bouyer return error; 107 1.1.2.2 bouyer 108 1.1.2.2 bouyer vp = ni.ni_vp; 109 1.1.2.2 bouyer 110 1.1.2.2 bouyer if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE, 111 1.1.2.2 bouyer 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, 112 1.1.2.2 bouyer &rem, p))) { 113 1.1.2.2 bouyer vrele(vp); 114 1.1.2.2 bouyer return error; 115 1.1.2.2 bouyer } 116 1.1.2.2 bouyer 117 1.1.2.2 bouyer if (rem != 0) { 118 1.1.2.2 bouyer vrele(vp); 119 1.1.2.2 bouyer return ENOEXEC; 120 1.1.2.2 bouyer } 121 1.1.2.2 bouyer 122 1.1.2.2 bouyer if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE) 123 1.1.2.2 bouyer return ENOEXEC; 124 1.1.2.2 bouyer 125 1.1.2.2 bouyer magic = LINUX_N_MAGIC(&hdr); 126 1.1.2.2 bouyer taddr = hdr.a_entry & (~(NBPG - 1)); 127 1.1.2.2 bouyer tsize = hdr.a_text; 128 1.1.2.2 bouyer daddr = taddr + tsize; 129 1.1.2.2 bouyer dsize = hdr.a_data + hdr.a_bss; 130 1.1.2.2 bouyer 131 1.1.2.2 bouyer if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) { 132 1.1.2.2 bouyer vrele(vp); 133 1.1.2.2 bouyer return ETXTBSY; 134 1.1.2.2 bouyer } 135 1.1.2.2 bouyer vn_marktext(vp); 136 1.1.2.2 bouyer 137 1.1.2.2 bouyer vcset.evs_cnt = 0; 138 1.1.2.2 bouyer vcset.evs_used = 0; 139 1.1.2.2 bouyer 140 1.1.2.2 bouyer NEW_VMCMD(&vcset, 141 1.1.2.2 bouyer magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn, 142 1.1.2.2 bouyer hdr.a_text + hdr.a_data, taddr, 143 1.1.2.2 bouyer vp, LINUX_N_TXTOFF(hdr, magic), 144 1.1.2.2 bouyer VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE); 145 1.1.2.2 bouyer 146 1.1.2.2 bouyer baddr = roundup(daddr + hdr.a_data, NBPG); 147 1.1.2.2 bouyer bsize = daddr + dsize - baddr; 148 1.1.2.2 bouyer if (bsize > 0) { 149 1.1.2.2 bouyer NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr, 150 1.1.2.2 bouyer NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 151 1.1.2.2 bouyer } 152 1.1.2.2 bouyer 153 1.1.2.2 bouyer for (i = 0; i < vcset.evs_used && !error; i++) { 154 1.1.2.2 bouyer struct exec_vmcmd *vcp; 155 1.1.2.2 bouyer 156 1.1.2.2 bouyer vcp = &vcset.evs_cmds[i]; 157 1.1.2.2 bouyer error = (*vcp->ev_proc)(p, vcp); 158 1.1.2.2 bouyer } 159 1.1.2.2 bouyer 160 1.1.2.2 bouyer kill_vmcmds(&vcset); 161 1.1.2.2 bouyer 162 1.1.2.2 bouyer vrele(vp); 163 1.1.2.2 bouyer 164 1.1.2.2 bouyer return error; 165 1.1.2.2 bouyer } 166
Indexes created Tue Sep 23 14:10:03 GMT 2025