Temporary exec_elf.c overriding the one in kern until changes

merged with kern/exec_elf.c.

1 files changed, 630 insertions, 0 deletions

diff --git a/sys/arch/pica/pica/exec_elf.c b/sys/arch/pica/pica/exec_elf.c
new file mode 100644
index 00000000000..a934ab322ac
--- /dev/null
+++ b/sys/arch/pica/pica/exec_elf.c
@@ -0,0 +1,630 @@
+/*	$NetBSD: exec_elf.c,v 1.3 1995/09/16 00:28:08 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1994 Christos Zoulas
+ * 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. 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/kernel.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/exec.h>
+#include <sys/exec_elf.h>
+#include <sys/syscall.h>
+#include <sys/signalvar.h>
+
+#include <sys/mman.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_map.h>
+
+#include <machine/cpu.h>
+#include <machine/reg.h>
+#include <machine/exec.h>
+
+#ifdef COMPAT_LINUX
+#include <compat/linux/linux_exec.h>
+#endif
+
+#ifdef COMPAT_SVR4
+#include <compat/svr4/svr4_exec.h>
+#endif
+
+int (*elf_probe_funcs[])() = {
+#ifdef COMPAT_SVR4
+	svr4_elf_probe,
+#endif
+#ifdef COMPAT_LINUX
+	linux_elf_probe
+#endif
+};
+
+static int elf_set_segment __P((struct exec_package *, u_long, u_long,
+	int));
+static int elf_read_from __P((struct proc *, struct vnode *, u_long,
+	caddr_t, int));
+static void elf_load_psection __P((struct exec_vmcmd_set *,
+	struct vnode *, Elf32_Phdr *, u_long *, u_long *, int *));
+
+#define ELF_ALIGN(a, b) ((a) & ~((b) - 1))
+
+/*
+ * This is the basic elf emul.
+ */
+
+extern char sigcode[], esigcode[];
+#ifdef SYSCALL_DEBUG  
+extern char *syscallnames[];
+#endif
+
+struct emul emul_elf = {
+	"netbsd",
+	NULL,
+	sendsig,
+	SYS_syscall,
+	SYS_MAXSYSCALL,
+	sysent,
+#ifdef SYSCALL_DEBUG
+	syscallnames,
+#else
+	NULL,
+#endif
+	sizeof(AuxInfo) * 8,
+	elf_copyargs,
+	setregs, 
+	sigcode,
+	esigcode,
+};
+
+/*
+ * Copy arguments onto the stack in the normal way, but add some
+ * extra information in case of dynamic binding.
+ */
+void *
+elf_copyargs(pack, arginfo, stack, argp)
+	struct exec_package *pack;
+	struct ps_strings *arginfo;
+	void *stack;
+	void *argp;
+{
+	char **cpp = stack;
+	char *dp, *sp;
+	size_t len;
+	void *nullp = NULL;
+	int argc = arginfo->ps_nargvstr;
+	int envc = arginfo->ps_nenvstr;
+	AuxInfo *a;
+	struct elf_args *ap;
+
+	if (copyout(&argc, cpp++, sizeof(argc)))
+		return NULL;
+
+	dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen);
+	sp = argp;
+
+	/* XXX don't copy them out, remap them! */
+	arginfo->ps_argvstr = cpp; /* remember location of argv for later */
+
+	for (; --argc >= 0; sp += len, dp += len)
+		if (copyout(&dp, cpp++, sizeof(dp)) ||
+		    copyoutstr(sp, dp, ARG_MAX, &len))
+			return NULL;
+
+	if (copyout(&nullp, cpp++, sizeof(nullp)))
+		return NULL;
+
+	arginfo->ps_envstr = cpp; /* remember location of envp for later */
+
+	for (; --envc >= 0; sp += len, dp += len)
+		if (copyout(&dp, cpp++, sizeof(dp)) ||
+		    copyoutstr(sp, dp, ARG_MAX, &len))
+			return NULL;
+
+	if (copyout(&nullp, cpp++, sizeof(nullp)))
+		return NULL;
+
+	/*
+	 * Push extra arguments on the stack needed by dynamically
+	 * linked binaries
+	 */
+	a = (AuxInfo *) cpp;
+	if ((ap = (struct elf_args *) pack->ep_emul_arg)) {
+
+		a->au_id = AUX_phdr;
+		a->au_v = ap->arg_phaddr;
+		a++;
+
+		a->au_id = AUX_phent;
+		a->au_v = ap->arg_phentsize;
+		a++;
+
+		a->au_id = AUX_phnum;
+		a->au_v = ap->arg_phnum;
+		a++;
+
+		a->au_id = AUX_pagesz;
+		a->au_v = NBPG;
+		a++;
+
+		a->au_id = AUX_base;
+		a->au_v = ap->arg_interp;
+		a++;
+
+		a->au_id = AUX_flags;
+		a->au_v = 0;
+		a++;
+
+		a->au_id = AUX_entry;
+		a->au_v = ap->arg_entry;
+		a++;
+
+		a->au_id = AUX_null;
+		a->au_v = 0;
+		a++;
+
+		free((char *) ap, M_TEMP);
+	}
+	return a;
+}
+
+/*
+ * elf_check_header():
+ *
+ * Check header for validity; return 0 of ok ENOEXEC if error
+ *
+ * XXX machine type needs to be moved to <machine/param.h> so
+ * just one comparison can be done. Unfortunately, there is both
+ * em_486 and em_386, so this would not work on the i386.
+ */
+int
+elf_check_header(eh, type)
+	Elf32_Ehdr *eh;
+	int type;
+{
+
+	if (bcmp(eh->e_ident, Elf32_e_ident, Elf32_e_siz) != 0)
+		return ENOEXEC;
+
+	switch (eh->e_machine) {
+	/* XXX */
+#ifdef i386
+	case Elf32_em_386:
+	case Elf32_em_486:
+#endif
+#ifdef sparc
+	case Elf32_em_sparc:
+#endif
+#ifdef mips
+	case Elf32_em_mips:
+#endif
+		break;
+
+	default:
+		return ENOEXEC;
+	}
+
+	if (eh->e_type != type)
+		return ENOEXEC;
+
+	return 0;
+}
+
+/*
+ * elf_load_psection():
+ * 
+ * Load a psection at the appropriate address
+ */
+static void
+elf_load_psection(vcset, vp, ph, addr, size, prot)
+	struct exec_vmcmd_set *vcset;
+	struct vnode *vp;
+	Elf32_Phdr *ph;
+	u_long *addr;
+	u_long *size;
+	int *prot;
+{
+	u_long uaddr, msize, psize, rm, rf;
+	long diff, offset;
+
+	/*
+         * If the user specified an address, then we load there.
+         */
+	if (*addr != ELF32_NO_ADDR) {
+		if (ph->p_align > 1) {
+			*addr = ELF_ALIGN(*addr + ph->p_align, ph->p_align);
+			uaddr = ELF_ALIGN(ph->p_vaddr, ph->p_align);
+		} else
+			uaddr = ph->p_vaddr;
+		diff = ph->p_vaddr - uaddr;
+	} else {
+		*addr = uaddr = ph->p_vaddr;
+		if (ph->p_align > 1)
+			*addr = ELF_ALIGN(uaddr, ph->p_align);
+		diff = uaddr - *addr;
+	}
+
+	*prot |= (ph->p_flags & Elf32_pf_r) ? VM_PROT_READ : 0;
+	*prot |= (ph->p_flags & Elf32_pf_w) ? VM_PROT_WRITE : 0;
+	*prot |= (ph->p_flags & Elf32_pf_x) ? VM_PROT_EXECUTE : 0;
+
+	offset = ph->p_offset - diff;
+	*size = ph->p_filesz + diff;
+	msize = ph->p_memsz + diff;
+	psize = round_page(*size);
+
+	if(ph->p_flags & Elf32_pf_w) {
+		psize = trunc_page(*size);
+		NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot);
+		if(psize != *size) {
+			NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize, *addr + psize, vp, offset + psize, *prot);
+		}
+	}
+	else {
+		NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot);
+	}
+
+	/*
+         * Check if we need to extend the size of the segment
+         */
+	rm = round_page(*addr + msize);
+	rf = round_page(*addr + *size);
+
+	if (rm != rf) {
+		NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, *prot);
+		*size = msize;
+	}
+}
+
+/*
+ * elf_set_segment():
+ *
+ * Decide if the segment is text or data, depending on the protection
+ * and set it appropriately
+ */
+static int
+elf_set_segment(epp, vaddr, size, prot)
+	struct exec_package *epp;
+	u_long vaddr;
+	u_long size;
+	int prot;
+{
+	/*
+         * Kludge: Unfortunately the current implementation of
+         * exec package assumes a single text and data segment.
+         * In Elf we can have more, but here we limit ourselves
+         * to two and hope :-(
+         * We also assume that the text is r-x, and data is rwx or rw-.
+         */
+	switch (prot) {
+	case (VM_PROT_READ | VM_PROT_EXECUTE):
+		if (epp->ep_tsize != ELF32_NO_ADDR)
+			return ENOEXEC;
+		epp->ep_taddr = vaddr;
+		epp->ep_tsize = size;
+		break;
+
+	case (VM_PROT_READ | VM_PROT_WRITE):
+	case (VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE):
+		if (epp->ep_dsize != ELF32_NO_ADDR)
+			return ENOEXEC;
+		epp->ep_daddr = vaddr;
+		epp->ep_dsize = size;
+		break;
+
+	default:
+		return ENOEXEC;
+	}
+	return 0;
+}
+
+/*
+ * elf_read_from():
+ *
+ *	Read from vnode into buffer at offset.
+ */
+static int
+elf_read_from(p, vp, off, buf, size)
+	struct vnode *vp;
+	u_long off;
+	struct proc *p;
+	caddr_t buf;
+	int size;
+{
+	int error;
+	int resid;
+
+	if ((error = vn_rdwr(UIO_READ, vp, buf, size,
+			     off, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
+			     &resid, p)) != 0)
+		return error;
+	/*
+         * See if we got all of it
+         */
+	if (resid != 0)
+		return error;
+	return 0;
+}
+
+/*
+ * elf_load_file():
+ *
+ * Load a file (interpreter/library) pointed to by path
+ * [stolen from coff_load_shlib()]. Made slightly generic
+ * so it might be used externally.
+ */
+int
+elf_load_file(p, path, vcset, entry, ap, last)
+	struct proc *p;
+	char *path;
+	struct exec_vmcmd_set *vcset;
+	u_long *entry;
+	struct elf_args	*ap;
+	u_long *last;
+{
+	int error, i;
+	struct nameidata nd;
+	Elf32_Ehdr eh;
+	Elf32_Phdr *ph = NULL;
+	u_long phsize;
+	char *bp = NULL;
+	u_long addr = *last;
+
+	bp = path;
+	/*
+         * 1. open file
+         * 2. read filehdr
+         * 3. map text, data, and bss out of it using VM_*
+         */
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p);
+	if ((error = namei(&nd)) != 0) {
+		return error;
+	}
+	if ((error = elf_read_from(p, nd.ni_vp, 0, (caddr_t) &eh,
+				    sizeof(eh))) != 0)
+		goto bad;
+
+	if ((error = elf_check_header(&eh, Elf32_et_dyn)) != 0)
+		goto bad;
+
+	phsize = eh.e_phnum * sizeof(Elf32_Phdr);
+	ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
+
+	if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff,
+				    (caddr_t) ph, phsize)) != 0)
+		goto bad;
+
+	/*
+         * Load all the necessary sections
+         */
+	for (i = 0; i < eh.e_phnum; i++) {
+		u_long size = 0;
+		int prot = 0;
+
+		switch (ph[i].p_type) {
+		case Elf32_pt_load:
+			elf_load_psection(vcset, nd.ni_vp, &ph[i], &addr,
+						&size, &prot);
+			/* Assume that the text segment is r-x only */
+			if ((prot & PROT_WRITE) == 0) {
+				*entry = addr + eh.e_entry - ph[i].p_vaddr;
+				ap->arg_interp = addr;
+			}
+			addr += size;
+			break;
+
+		case Elf32_pt_dynamic:
+		case Elf32_pt_phdr:
+		case Elf32_pt_note:
+			break;
+
+		default:
+			break;
+		}
+	}
+
+bad:
+	if (ph != NULL)
+		free((char *) ph, M_TEMP);
+
+	*last = addr;
+	vrele(nd.ni_vp);
+	return error;
+}
+
+/*
+ * exec_elf_makecmds(): Prepare an Elf 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_elf_makecmds(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	Elf32_Ehdr *eh = epp->ep_hdr;
+	Elf32_Phdr *ph, *pp;
+	int error, i, n;
+	char interp[MAXPATHLEN];
+	u_long pos = 0, phsize;
+
+	if (epp->ep_hdrvalid < sizeof(Elf32_Ehdr))
+		return ENOEXEC;
+
+	if (elf_check_header(eh, Elf32_et_exec))
+		return ENOEXEC;
+
+	/*
+         * 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 (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;
+	}
+	/*
+         * Allocate space to hold all the program headers, and read them
+         * from the file
+         */
+	phsize = eh->e_phnum * sizeof(Elf32_Phdr);
+	ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
+
+	if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff,
+				    (caddr_t) ph, phsize)) != 0)
+		goto bad;
+
+	epp->ep_tsize = ELF32_NO_ADDR;
+	epp->ep_dsize = ELF32_NO_ADDR;
+
+	interp[0] = '\0';
+
+	for (i = 0; i < eh->e_phnum; i++) {
+		pp = &ph[i];
+		if (pp->p_type == Elf32_pt_interp) {
+			if (pp->p_filesz >= sizeof(interp))
+				goto bad;
+			if ((error = elf_read_from(p, epp->ep_vp, pp->p_offset,
+				      (caddr_t) interp, pp->p_filesz)) != 0)
+				goto bad;
+			break;
+		}
+	}
+
+	/*
+	 * OK, we want a slightly different twist of the
+         * standard emulation package for "real" elf.
+         */
+	epp->ep_emul = &emul_elf;
+	pos = ELF32_NO_ADDR;
+
+	/*
+	 * On the same architecture, we may be emulating different systems.
+	 * See which one will accept this executable. This currently only
+	 * applies to Linux and SVR4 on the i386.
+	 *
+	 * Probe functions would normally see if the interpreter (if any)
+	 * exists. Emulation packages may possibly replace the interpreter in
+	 * interp[] with a changed path (/emul/xxx/<path>), and also
+	 * set the ep_emul field in the exec package structure.
+	 */
+	if ((n = sizeof elf_probe_funcs / sizeof elf_probe_funcs[0])) {
+		error = ENOEXEC;
+		for (i = 0; i < n && error; i++)
+			error = elf_probe_funcs[i](p, epp, interp, &pos);
+
+		if (error)
+			goto bad;
+	}
+
+	/*
+         * Load all the necessary sections
+         */
+	for (i = 0; i < eh->e_phnum; i++) {
+		u_long  addr = ELF32_NO_ADDR, size = 0;
+		int prot = 0;
+
+		pp = &ph[i];
+
+		switch (ph[i].p_type) {
+		case Elf32_pt_load:
+			elf_load_psection(&epp->ep_vmcmds, epp->ep_vp,
+				&ph[i], &addr, &size, &prot);
+			if ((error = elf_set_segment(epp, addr, size,
+						      prot)) != 0)
+				goto bad;
+			break;
+
+		case Elf32_pt_shlib:
+			error = ENOEXEC;
+			goto bad;
+
+		case Elf32_pt_interp:
+			/* Already did this one */
+		case Elf32_pt_dynamic:
+		case Elf32_pt_phdr:
+		case Elf32_pt_note:
+			break;
+
+		default:
+			/*
+			 * Not fatal, we don't need to understand everything
+			 * :-)
+			 */
+			break;
+		}
+	}
+
+	/*
+         * Check if we found a dynamically linked binary and arrange to load
+         * it's interpreter
+         */
+	if (interp[0]) {
+		struct elf_args *ap;
+
+		ap = (struct elf_args *) malloc(sizeof(struct elf_args),
+						 M_TEMP, M_WAITOK);
+		if ((error = elf_load_file(p, interp, &epp->ep_vmcmds,
+				&epp->ep_entry, ap, &pos)) != 0) {
+			free((char *) ap, M_TEMP);
+			goto bad;
+		}
+		/* Arrange to load the program headers. */
+		pos = ELF_ALIGN(pos + NBPG, NBPG);
+		ap->arg_phaddr = pos;
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, phsize,
+			  pos, epp->ep_vp, eh->e_phoff,
+			  VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
+		pos += phsize;
+
+		ap->arg_phentsize = eh->e_phentsize;
+		ap->arg_phnum = eh->e_phnum;
+		ap->arg_entry = eh->e_entry;
+
+		epp->ep_emul_arg = ap;
+	} else
+		epp->ep_entry = eh->e_entry;
+
+	free((char *) ph, M_TEMP);
+	epp->ep_vp->v_flag |= VTEXT;
+	return exec_aout_setup_stack(p, epp);
+
+bad:
+	free((char *) ph, M_TEMP);
+	kill_vmcmds(&epp->ep_vmcmds);
+	return ENOEXEC;
+}