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authorfvdl <fvdl@NetBSD.org>1995-02-28 23:24:35 +0000
committerfvdl <fvdl@NetBSD.org>1995-02-28 23:24:35 +0000
commit3bf459f350dcbcf47afccba837f4466b132a98c8 (patch)
tree282143a8f0ed1d8860e89324a32312964e0bd6e8 /sys/compat/linux/common/linux_exec.c
parent8bb0b6790c84a1e16ffa558fd110fb0d90cd0470 (diff)
Added Linux compat code.
Diffstat (limited to 'sys/compat/linux/common/linux_exec.c')
-rw-r--r--sys/compat/linux/common/linux_exec.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/sys/compat/linux/common/linux_exec.c b/sys/compat/linux/common/linux_exec.c
new file mode 100644
index 00000000000..72174b43d4b
--- /dev/null
+++ b/sys/compat/linux/common/linux_exec.c
@@ -0,0 +1,383 @@
+/* $NetBSD: linux_exec.c,v 1.1 1995/02/28 23:24:46 fvdl Exp $ */
+
+/*
+ * Copyright (c) 1995 Frank van der Linden
+ * 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 for the NetBSD Project
+ * by Frank van der Linden
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without 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.
+ *
+ * based on kern/exec_aout.c and compat/sunos/sunos_exec.c
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/filedesc.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/malloc.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/file.h>
+#include <sys/resourcevar.h>
+#include <sys/wait.h>
+
+#include <sys/mman.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_map.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_pager.h>
+
+#include <machine/cpu.h>
+#include <machine/reg.h>
+#include <machine/exec.h>
+
+#include <compat/linux/linux_types.h>
+#include <compat/linux/linux_syscallargs.h>
+#include <compat/linux/linux_util.h>
+#include <compat/linux/linux_exec.h>
+
+int
+exec_linux_aout_makecmds(p, epp)
+ struct proc *p;
+ struct exec_package *epp;
+{
+ struct exec *linux_ep = epp->ep_hdr;
+ int machtype, magic;
+ int error = ENOEXEC;
+
+ magic = LINUX_N_MAGIC(linux_ep);
+ machtype = LINUX_N_MACHTYPE(linux_ep);
+
+
+ if (machtype != LINUX_MID_MACHINE)
+ return (ENOEXEC);
+
+ switch (magic) {
+ case QMAGIC:
+ error = exec_linux_aout_prep_qmagic(p, epp);
+ break;
+ case ZMAGIC:
+ error = exec_linux_aout_prep_zmagic(p, epp);
+ break;
+ case NMAGIC:
+ error = exec_linux_aout_prep_nmagic(p, epp);
+ break;
+ case OMAGIC:
+ error = exec_linux_aout_prep_omagic(p, epp);
+ break;
+ }
+ if (error == 0)
+ epp->ep_emul = EMUL_LINUX;
+ return error;
+}
+
+/*
+ * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
+ * is very likely not page aligned on most architectures, it is treated
+ * as an NMAGIC here. XXX
+ */
+
+int
+exec_linux_aout_prep_zmagic(p, epp)
+ struct proc *p;
+ struct exec_package *epp;
+{
+ struct exec *execp = epp->ep_hdr;
+
+ epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+
+ /* set up command for text segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+ epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
+ VM_PROT_READ|VM_PROT_EXECUTE);
+
+ /* set up command for data segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+ epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+ epp->ep_daddr + execp->a_data, NULLVP, 0,
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ return exec_aout_setup_stack(p, epp);
+}
+
+/*
+ * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
+ * Not different from the normal stuff.
+ */
+
+int
+exec_linux_aout_prep_nmagic(p, epp)
+ struct proc *p;
+ struct exec_package *epp;
+{
+ struct exec *execp = epp->ep_hdr;
+ long bsize, baddr;
+
+ epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+
+ /* set up command for text segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+ epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
+ VM_PROT_READ|VM_PROT_EXECUTE);
+
+ /* set up command for data segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+ epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+ bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+ if (bsize > 0)
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+ NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ return exec_aout_setup_stack(p, epp);
+}
+
+/*
+ * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
+ * Business as usual.
+ */
+
+int
+exec_linux_aout_prep_omagic(p, epp)
+ struct proc *p;
+ struct exec_package *epp;
+{
+ struct exec *execp = epp->ep_hdr;
+ long dsize, bsize, baddr;
+
+ epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+
+ /* set up command for text and data segments */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
+ execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
+ LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+ bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+ if (bsize > 0)
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+ NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /*
+ * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
+ * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
+ * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
+ * respectively to page boundaries.
+ * Compensate `ep_dsize' for the amount of data covered by the last
+ * text page.
+ */
+ dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
+ epp->ep_dsize = (dsize > 0) ? dsize : 0;
+ return exec_aout_setup_stack(p, epp);
+}
+
+int
+exec_linux_aout_prep_qmagic(p, epp)
+ struct proc *p;
+ struct exec_package *epp;
+{
+ struct exec *execp = epp->ep_hdr;
+
+ epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
+ epp->ep_tsize = execp->a_text;
+ epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
+ epp->ep_dsize = execp->a_data + execp->a_bss;
+ epp->ep_entry = execp->a_entry;
+
+ /*
+ * check if vnode is in open for writing, because we want to
+ * demand-page out of it. if it is, don't do it, for various
+ * reasons
+ */
+ if ((execp->a_text != 0 || execp->a_data != 0) &&
+ epp->ep_vp->v_writecount != 0) {
+#ifdef DIAGNOSTIC
+ if (epp->ep_vp->v_flag & VTEXT)
+ panic("exec: a VTEXT vnode has writecount != 0\n");
+#endif
+ return ETXTBSY;
+ }
+ epp->ep_vp->v_flag |= VTEXT;
+
+ /* set up command for text segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
+ epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
+ VM_PROT_READ|VM_PROT_EXECUTE);
+
+ /* set up command for data segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
+ epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ /* set up command for bss segment */
+ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+ epp->ep_daddr + execp->a_data, NULLVP, 0,
+ VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+ return exec_aout_setup_stack(p, epp);
+}
+
+/*
+ * The Linux system call to load shared libraries. The current shared
+ * libraries are just (QMAGIC) a.out files that are mapped onto a fixed
+ * address * in the process' address space. The address is given in
+ * a_entry. Read in the header, set up some VM commands and run them.
+ *
+ * Yes, both text and data are mapped at once, so we're left with
+ * writeable text for the shared libs. The Linux crt0 seemed to break
+ * sometimes when data was mapped seperately. It munmapped a uselib()
+ * of ld.so by hand, which failed with shared text and data for ld.so
+ * Yuck.
+ *
+ * Because of the problem with ZMAGIC executables (text starts
+ * at 0x400 in the file, but needs t be mapped at 0), ZMAGIC
+ * shared libs are not handled very efficiently :-(
+ */
+
+int
+linux_uselib(p, uap, retval)
+ struct proc *p;
+ struct linux_uselib_args /* {
+ syscallarg(char *) path;
+ } */ *uap;
+ register_t *retval;
+{
+ caddr_t sg;
+ long bsize, dsize, tsize, taddr, baddr, daddr;
+ struct nameidata ni;
+ struct vnode *vp;
+ struct exec hdr;
+ struct exec_vmcmd_set vcset;
+ int rem, i, magic, error;
+
+ sg = stackgap_init();
+ CHECK_ALT(p, &sg, SCARG(uap, path));
+
+ NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+
+ if ((error = namei(&ni)))
+ return error;
+
+ vp = ni.ni_vp;
+
+ if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
+ 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
+ &rem, p))) {
+ vrele(vp);
+ return error;
+ }
+
+ if (rem != 0) {
+ vrele(vp);
+ return ENOEXEC;
+ }
+
+ magic = LINUX_N_MAGIC(&hdr);
+ taddr = hdr.a_entry & (~(NBPG - 1));
+ tsize = hdr.a_text;
+ daddr = taddr + tsize;
+ dsize = hdr.a_data + hdr.a_bss;
+
+ if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
+ vrele(vp);
+ return ETXTBSY;
+ }
+ vp->v_flag |= VTEXT;
+
+ vcset.evs_cnt = 0;
+ vcset.evs_used = 0;
+
+ NEW_VMCMD(&vcset,
+ magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
+ hdr.a_text + hdr.a_data, taddr,
+ vp, LINUX_N_TXTOFF(hdr, magic),
+ VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
+
+ baddr = roundup(daddr + hdr.a_data, NBPG);
+ bsize = daddr + dsize - baddr;
+ if (bsize > 0) {
+ NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
+ NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+ }
+
+ for (i = 0; i < vcset.evs_used && !error; i++) {
+ struct exec_vmcmd *vcp;
+
+ vcp = &vcset.evs_cmds[i];
+ error = (*vcp->ev_proc)(p, vcp);
+ }
+
+ kill_vmcmds(&vcset);
+
+ vrele(vp);
+
+ return error;
+}
+
+/*
+ * Execve(2). Just check the alternate emulation path, and pass it on
+ * to the NetBSD execve().
+ */
+int
+linux_execve(p, uap, retval)
+ struct proc *p;
+ struct linux_execve_args /* {
+ syscallarg(char *) path;
+ syscallarg(char **) argv;
+ syscallarg(char **) envp;
+ } */ *uap;
+ register_t *retval;
+{
+ caddr_t sg;
+
+ sg = stackgap_init();
+ CHECK_ALT(p, &sg, SCARG(uap, path));
+
+ return execve(p, uap, retval);
+}