Infrastructure tweaks to allow having both an Elf32 and an Elf64 executable

handler in the kernel at the same time.  Also, allow for the
exec_new_vmspace() code to build a different sized vmspace depending on
the executable environment.  This is a big help for execing i386 binaries
on ia64.   The ELF exec code grows the ability to map partial pages when
there is a page size difference, eg: emulating 4K pages on 8K or 16K
hardware pages.

Flesh out the i386 emulation support for ia64.  At this point, the only
binary that I know of that fails is cvsup, because the cvsup runtime
tries to execute code in pages not marked executable.

Obtained from:  dfr (mostly, many tweaks from me).

1 files changed, 94 insertions, 0 deletions

diff --git a/sys/compat/ia32/ia32_util.h b/sys/compat/ia32/ia32_util.h
new file mode 100644
index 0000000..b9e0a7c
--- /dev/null
+++ b/sys/compat/ia32/ia32_util.h
@@ -0,0 +1,94 @@
+/*-
+ * Copyright (c) 1998-1999 Andrew Gallatin
+ * 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
+ *    in this position and unchanged.
+ * 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 withough 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+
+#include <sys/exec.h>
+#include <sys/sysent.h>
+#include <sys/cdefs.h>
+
+
+#ifndef	SCARG
+#define	SCARG(p, x)  (p)->x
+#endif
+
+struct ia32_ps_strings {
+	u_int32_t ps_argvstr;	/* first of 0 or more argument strings */
+	int	ps_nargvstr;	/* the number of argument strings */
+	u_int32_t ps_envstr;	/* first of 0 or more environment strings */
+	int	ps_nenvstr;	/* the number of environment strings */
+};
+
+#define IA32_USRSTACK	(4L*1024*1024*1024 - PAGE_SIZE)
+#define IA32_PS_STRINGS	(IA32_USRSTACK - sizeof(struct ia32_ps_strings))
+
+static __inline caddr_t stackgap_init(void);
+static __inline void *stackgap_alloc(caddr_t *, size_t);
+
+static __inline caddr_t
+stackgap_init()
+{
+#define	szsigcode (*(curproc->p_sysent->sv_szsigcode))
+	return (caddr_t)(((caddr_t)IA32_PS_STRINGS) - szsigcode - SPARE_USRSPACE);
+#undef szsigcode
+}
+
+static __inline void *
+stackgap_alloc(sgp, sz)
+	caddr_t *sgp;
+	size_t   sz;
+{
+	void *p;
+
+	p = (void *) *sgp;
+	*sgp += ALIGN(sz);
+	return p;
+}
+
+
+extern const char ia32_emul_path[];
+int ia32_emul_find(struct thread *, caddr_t *, const char *, char *,
+			char **, int);
+
+#define CHECKALT(p, sgp, path, i)					\
+	do {								\
+		int _error;						\
+									\
+		_error = ia32_emul_find(p, sgp, ia32_emul_path, path,	\
+					&path, i);			\
+		if (_error == EFAULT)					\
+			return (_error);				\
+	} while (0)
+
+#define	CHECKALTEXIST(p, sgp, path) CHECKALT((p), (sgp), (path), 0)
+#define	CHECKALTCREAT(p, sgp, path) CHECKALT((p), (sgp), (path), 1)