initial import of NetBSD tree

1 files changed, 272 insertions, 0 deletions

diff --git a/sys/kern/exec_aout.c b/sys/kern/exec_aout.c
new file mode 100644
index 00000000000..7b84aafde96
--- /dev/null
+++ b/sys/kern/exec_aout.c
@@ -0,0 +1,272 @@
+/*	$NetBSD: exec_aout.c,v 1.13 1994/08/01 18:49:49 pk Exp $	*/
+
+/*
+ * Copyright (c) 1993, 1994 Christopher G. Demetriou
+ * 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 by Christopher G. Demetriou.
+ * 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.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/vnode.h>
+#include <sys/exec.h>
+#include <sys/resourcevar.h>
+#include <vm/vm.h>
+
+/*
+ * exec_aout_makecmds(): Check if it's an a.out-format executable.
+ *
+ * Given a proc pointer and an exec package pointer, see if the referent
+ * of the epp is in a.out format.  First check 'standard' magic numbers for
+ * this architecture.  If that fails, try a cpu-dependent hook.
+ *
+ * This function, in the former case, or the hook, in the latter, is
+ * responsible for creating a set of vmcmds which can be used to build
+ * the process's vm space and inserting them into the exec package.
+ */
+
+int
+exec_aout_makecmds(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	u_long midmag, magic;
+	u_short mid;
+	int error;
+	struct exec *execp = epp->ep_hdr;
+
+	if (epp->ep_hdrvalid < sizeof(struct exec))
+		return ENOEXEC;
+
+	midmag = ntohl(execp->a_midmag);
+	mid = (midmag >> 16) & 0x3ff;
+	magic = midmag & 0xffff;
+
+	midmag = mid << 16 | magic;
+
+	switch (midmag) {
+	case (MID_MACHINE << 16) | ZMAGIC:
+		error = exec_aout_prep_zmagic(p, epp);
+		break;
+	case (MID_MACHINE << 16) | NMAGIC:
+		error = exec_aout_prep_nmagic(p, epp);
+		break;
+	case (MID_MACHINE << 16) | OMAGIC:
+		error = exec_aout_prep_omagic(p, epp);
+		break;
+	default:
+		error = cpu_exec_aout_makecmds(p, epp);
+	}
+
+	if (error)
+		kill_vmcmds(&epp->ep_vmcmds);
+
+bad:
+	return error;
+}
+
+/*
+ * exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's exec package
+ *
+ * First, set of the various offsets/lengths in the exec package.
+ *
+ * Then, mark the text image busy (so it can be demand paged) or error
+ * out if this is not possible.  Finally, set up vmcmds for the
+ * text, data, bss, and stack segments.
+ */
+
+int
+exec_aout_prep_zmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+
+	epp->ep_taddr = USRTEXT;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = epp->ep_taddr + execp->a_text;
+	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, 0, 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, execp->a_text,
+	    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 a 'native' NMAGIC binary's exec package
+ */
+
+int
+exec_aout_prep_nmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+	long bsize, baddr;
+
+	epp->ep_taddr = USRTEXT;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ);
+	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, sizeof(struct exec),
+	    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, execp->a_text + sizeof(struct exec),
+	    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 a 'native' OMAGIC binary's exec package
+ */
+
+int
+exec_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 = USRTEXT;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = epp->ep_taddr + execp->a_text;
+	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,
+	    sizeof(struct exec), 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);
+}
+
+/*
+ * exec_aout_setup_stack(): Set up the stack segment for an a.out
+ * executable.
+ *
+ * Note that the ep_ssize parameter must be set to be the current stack
+ * limit; this is adjusted in the body of execve() to yield the
+ * appropriate stack segment usage once the argument length is
+ * calculated.
+ *
+ * This function returns an int for uniformity with other (future) formats'
+ * stack setup functions.  They might have errors to return.
+ */
+
+int
+exec_aout_setup_stack(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+
+	epp->ep_maxsaddr = USRSTACK - MAXSSIZ;
+	epp->ep_minsaddr = USRSTACK;
+	epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur;
+
+	/*
+	 * set up commands for stack.  note that this takes *two*, one to
+	 * map the part of the stack which we can access, and one to map
+	 * the part which we can't.
+	 *
+	 * arguably, it could be made into one, but that would require the
+	 * addition of another mapping proc, which is unnecessary
+	 *
+	 * note that in memory, things assumed to be: 0 ....... ep_maxsaddr
+	 * <stack> ep_minsaddr
+	 */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
+	    ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
+	    epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE);
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
+	    (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return 0;
+}