465 lines
13 KiB
C
465 lines
13 KiB
C
/* $NetBSD: linux_exec.c,v 1.4 1995/04/22 19:48:34 christos Exp $ */
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/*
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* Copyright (c) 1995 Frank van der Linden
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Frank van der Linden
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* based on kern/exec_aout.c and compat/sunos/sunos_exec.c
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/resourcevar.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_pager.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <machine/exec.h>
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#include <machine/linux_machdep.h>
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#include <compat/linux/linux_types.h>
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#include <compat/linux/linux_syscall.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/linux_util.h>
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#include <compat/linux/linux_exec.h>
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static void *linux_copyargs __P((struct exec_package *, struct ps_strings *,
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void *, void *));
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#define LINUX_AUX_ARGSIZ 2
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extern int linux_error[];
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extern struct sysent linux_sysent[];
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extern char *linux_syscallnames[];
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struct emul emul_linux = {
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"linux",
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linux_error,
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linux_sendsig,
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LINUX_SYS_syscall,
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LINUX_SYS_MAXSYSCALL,
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linux_sysent,
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linux_syscallnames,
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LINUX_AUX_ARGSIZ,
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linux_copyargs,
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setregs,
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linux_sigcode,
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linux_esigcode,
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};
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static void *
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linux_copyargs(pack, arginfo, stack, argp)
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struct exec_package *pack;
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struct ps_strings *arginfo;
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void *stack;
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void *argp;
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{
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char **cpp = stack;
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char **stk = stack;
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char *dp, *sp;
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size_t len;
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void *nullp = NULL;
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int argc = arginfo->ps_nargvstr;
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int envc = arginfo->ps_nenvstr;
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if (copyout(&argc, cpp++, sizeof(argc)))
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return NULL;
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/* leave room for envp and argv */
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cpp += 2;
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if (copyout(&cpp, &stk[1], sizeof (cpp)))
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return NULL;
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dp = (char *) (cpp + argc + envc + 2);
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sp = argp;
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/* XXX don't copy them out, remap them! */
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arginfo->ps_argvstr = dp; /* remember location of argv for later */
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for (; --argc >= 0; sp += len, dp += len)
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if (copyout(&dp, cpp++, sizeof(dp)) ||
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copyoutstr(sp, dp, ARG_MAX, &len))
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return NULL;
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if (copyout(&nullp, cpp++, sizeof(nullp)))
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return NULL;
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if (copyout(&cpp, &stk[2], sizeof (cpp)))
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return NULL;
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arginfo->ps_envstr = dp; /* remember location of envp for later */
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for (; --envc >= 0; sp += len, dp += len)
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if (copyout(&dp, cpp++, sizeof(dp)) ||
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copyoutstr(sp, dp, ARG_MAX, &len))
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return NULL;
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if (copyout(&nullp, cpp++, sizeof(nullp)))
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return NULL;
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return cpp;
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}
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int
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exec_linux_aout_makecmds(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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struct exec *linux_ep = epp->ep_hdr;
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int machtype, magic;
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int error = ENOEXEC;
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magic = LINUX_N_MAGIC(linux_ep);
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machtype = LINUX_N_MACHTYPE(linux_ep);
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if (machtype != LINUX_MID_MACHINE)
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return (ENOEXEC);
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switch (magic) {
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case QMAGIC:
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error = exec_linux_aout_prep_qmagic(p, epp);
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break;
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case ZMAGIC:
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error = exec_linux_aout_prep_zmagic(p, epp);
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break;
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case NMAGIC:
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error = exec_linux_aout_prep_nmagic(p, epp);
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break;
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case OMAGIC:
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error = exec_linux_aout_prep_omagic(p, epp);
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break;
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}
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if (error == 0)
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epp->ep_emul = &emul_linux;
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return error;
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}
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/*
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* Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
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* is very likely not page aligned on most architectures, it is treated
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* as an NMAGIC here. XXX
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*/
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int
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exec_linux_aout_prep_zmagic(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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struct exec *execp = epp->ep_hdr;
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epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
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epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
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epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
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epp->ep_daddr + execp->a_data, NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return exec_aout_setup_stack(p, epp);
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}
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/*
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* exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
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* Not different from the normal stuff.
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*/
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int
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exec_linux_aout_prep_nmagic(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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struct exec *execp = epp->ep_hdr;
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long bsize, baddr;
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epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
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epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
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epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
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bsize = epp->ep_daddr + epp->ep_dsize - baddr;
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if (bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
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NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return exec_aout_setup_stack(p, epp);
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}
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/*
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* exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
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* Business as usual.
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*/
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int
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exec_linux_aout_prep_omagic(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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struct exec *execp = epp->ep_hdr;
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long dsize, bsize, baddr;
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epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/* set up command for text and data segments */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
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execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
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LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
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bsize = epp->ep_daddr + epp->ep_dsize - baddr;
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if (bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
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NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/*
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* Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
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* obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
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* computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
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* respectively to page boundaries.
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* Compensate `ep_dsize' for the amount of data covered by the last
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* text page.
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*/
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dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
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epp->ep_dsize = (dsize > 0) ? dsize : 0;
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return exec_aout_setup_stack(p, epp);
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}
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int
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exec_linux_aout_prep_qmagic(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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struct exec *execp = epp->ep_hdr;
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epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/*
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* check if vnode is in open for writing, because we want to
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* demand-page out of it. if it is, don't do it, for various
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* reasons
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*/
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if ((execp->a_text != 0 || execp->a_data != 0) &&
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epp->ep_vp->v_writecount != 0) {
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#ifdef DIAGNOSTIC
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if (epp->ep_vp->v_flag & VTEXT)
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panic("exec: a VTEXT vnode has writecount != 0\n");
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#endif
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return ETXTBSY;
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}
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epp->ep_vp->v_flag |= VTEXT;
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
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epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
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epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
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epp->ep_daddr + execp->a_data, NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return exec_aout_setup_stack(p, epp);
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}
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/*
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* The Linux system call to load shared libraries. The current shared
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* libraries are just (QMAGIC) a.out files that are mapped onto a fixed
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* address * in the process' address space. The address is given in
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* a_entry. Read in the header, set up some VM commands and run them.
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*
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* Yes, both text and data are mapped at once, so we're left with
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* writeable text for the shared libs. The Linux crt0 seemed to break
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* sometimes when data was mapped seperately. It munmapped a uselib()
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* of ld.so by hand, which failed with shared text and data for ld.so
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* Yuck.
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*
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* Because of the problem with ZMAGIC executables (text starts
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* at 0x400 in the file, but needs t be mapped at 0), ZMAGIC
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* shared libs are not handled very efficiently :-(
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*/
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int
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linux_uselib(p, uap, retval)
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struct proc *p;
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struct linux_uselib_args /* {
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syscallarg(char *) path;
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} */ *uap;
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register_t *retval;
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{
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caddr_t sg;
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long bsize, dsize, tsize, taddr, baddr, daddr;
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struct nameidata ni;
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struct vnode *vp;
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struct exec hdr;
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struct exec_vmcmd_set vcset;
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int rem, i, magic, error;
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sg = stackgap_init();
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CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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if ((error = namei(&ni)))
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return error;
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vp = ni.ni_vp;
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if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
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0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
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&rem, p))) {
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vrele(vp);
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return error;
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}
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if (rem != 0) {
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vrele(vp);
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return ENOEXEC;
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}
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magic = LINUX_N_MAGIC(&hdr);
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taddr = hdr.a_entry & (~(NBPG - 1));
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tsize = hdr.a_text;
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daddr = taddr + tsize;
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dsize = hdr.a_data + hdr.a_bss;
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if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
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vrele(vp);
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return ETXTBSY;
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}
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vp->v_flag |= VTEXT;
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vcset.evs_cnt = 0;
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vcset.evs_used = 0;
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NEW_VMCMD(&vcset,
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magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
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hdr.a_text + hdr.a_data, taddr,
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vp, LINUX_N_TXTOFF(hdr, magic),
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VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
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baddr = roundup(daddr + hdr.a_data, NBPG);
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bsize = daddr + dsize - baddr;
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if (bsize > 0) {
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NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
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NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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}
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for (i = 0; i < vcset.evs_used && !error; i++) {
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struct exec_vmcmd *vcp;
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vcp = &vcset.evs_cmds[i];
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error = (*vcp->ev_proc)(p, vcp);
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}
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kill_vmcmds(&vcset);
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vrele(vp);
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return error;
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}
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/*
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* Execve(2). Just check the alternate emulation path, and pass it on
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* to the NetBSD execve().
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*/
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int
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linux_execve(p, uap, retval)
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struct proc *p;
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struct linux_execve_args /* {
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syscallarg(char *) path;
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syscallarg(char **) argv;
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syscallarg(char **) envp;
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} */ *uap;
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register_t *retval;
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{
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caddr_t sg;
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sg = stackgap_init();
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CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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return execve(p, uap, retval);
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}
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