Initiate deorbit burn for the i386-only a.out related support. Moves are

under way to move the remnants of the a.out toolchain to ports.  As the
comment in src/Makefile said, this stuff is deprecated and one should not
expect this to remain beyond 4.0-REL.  It has already lasted WAY beyond
that.

Notable exceptions:
gcc - I have not touched the a.out generation stuff there.
ldd/ldconfig - still have some code to interface with a.out rtld.
old as/ld/etc - I have not removed these yet, pending their move to ports.
some includes - necessary for ldd/ldconfig for now.

Tested on: i386 (extensively), alpha

5 files changed, 8 insertions, 169 deletions

diff --git a/lib/libc/amd64/SYS.h b/lib/libc/amd64/SYS.h
index 5a636f8b33b9..1483f9d8e763 100644
--- a/lib/libc/amd64/SYS.h
+++ b/lib/libc/amd64/SYS.h
@@ -58,8 +58,4 @@
 /* gas messes up offset -- although we don't currently need it, do for BCS */
 #define	LCALL(x,y)	.byte 0x9a ; .long y; .word x
 
-#ifdef __ELF__
-#define KERNCALL	int $0x80	/* Faster */
-#else
-#define KERNCALL	LCALL(7,0)	/* The old way */
-#endif
+#define KERNCALL	int $0x80
diff --git a/lib/libc/gen/dlfcn.c b/lib/libc/gen/dlfcn.c
index 4a3500d4aa65..ff1d9006c860 100644
--- a/lib/libc/gen/dlfcn.c
+++ b/lib/libc/gen/dlfcn.c
@@ -28,12 +28,8 @@
 __FBSDID("$FreeBSD$");
 
 /*
- * Linkage to services provided by the dynamic linker.  These are
- * implemented differently in ELF and a.out, because the dynamic
- * linkers have different interfaces.
+ * Linkage to services provided by the dynamic linker.
  */
-#ifdef __ELF__
-
 #include <dlfcn.h>
 #include <stddef.h>
 
@@ -107,76 +103,3 @@ dlsym(void * __restrict handle, const char * __restrict name)
 	_rtld_error(sorry);
 	return NULL;
 }
-
-#else /* a.out format */
-
-#include <sys/types.h>
-#include <nlist.h>		/* XXX - Required by link.h */
-#include <dlfcn.h>
-#include <link.h>
-#include <stddef.h>
-
-/*
- * For a.out, entry to the dynamic linker is via these trampolines.
- * They enter the dynamic linker through the ld_entry struct that was
- * passed back from the dynamic linker at startup time.
- */
-
-/* GCC is needed because we use its __builtin_return_address construct. */
-
-#ifndef __GNUC__
-#error "GCC is needed to compile this file"
-#endif
-
-/*
- * These variables are set by code in crt0.o.  For compatibility with
- * old executables, they must be common, not extern.
- */
-struct ld_entry	*__ldso_entry;		/* Entry points to dynamic linker */
-int		 __ldso_version;	/* Dynamic linker version number */
-
-int
-dladdr(const void *addr, Dl_info *dlip)
-{
-	if (__ldso_entry == NULL || __ldso_version < LDSO_VERSION_HAS_DLADDR)
-		return 0;
-	return (__ldso_entry->dladdr)(addr, dlip);
-}
-
-int
-dlclose(void *handle)
-{
-	if (__ldso_entry == NULL)
-		return -1;
-	return (__ldso_entry->dlclose)(handle);
-}
-
-const char *
-dlerror(void)
-{
-	if (__ldso_entry == NULL)
-		return "Service unavailable";
-	return (__ldso_entry->dlerror)();
-}
-
-void *
-dlopen(const char *name, int mode)
-{
-	if (__ldso_entry == NULL)
-		return NULL;
-	return (__ldso_entry->dlopen)(name, mode);
-}
-
-void *
-dlsym(void * __restrict handle, const char * __restrict name)
-{
-	if (__ldso_entry == NULL)
-		return NULL;
-	if (__ldso_version >= LDSO_VERSION_HAS_DLSYM3) {
-		void *retaddr = __builtin_return_address(0); /* __GNUC__ only */
-		return (__ldso_entry->dlsym3)(handle, name, retaddr);
-	} else
-		return (__ldso_entry->dlsym)(handle, name);
-}
-
-#endif /* __ELF__ */
diff --git a/lib/libc/gen/getobjformat.c b/lib/libc/gen/getobjformat.c
index de5c9c161f99..7428f36b884b 100644
--- a/lib/libc/gen/getobjformat.c
+++ b/lib/libc/gen/getobjformat.c
@@ -33,88 +33,12 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <string.h>
 
-#define PATH_OBJFORMAT	"/etc/objformat"
-
-static int copyformat(char *, const char *, size_t);
-
-static const char *known_formats[] = { OBJFORMAT_NAMES, NULL };
-
-static int
-copyformat(char *buf, const char *fmt, size_t bufsize)
-{
-	size_t		 len;
-
-	len = strlen(fmt);
-	if (len > bufsize - 1)
-		return -1;
-	strcpy(buf, fmt);
-	return len;
-}
-
 int
 getobjformat(char *buf, size_t bufsize, int *argcp, char **argv)
 {
-	const char	 *fmt;
-	char		**src, **dst;
-	const char	 *env;
-	FILE		 *fp;
 
-	fmt = NULL;
-
-	if (argv != NULL) {
-		/* 
-		 * Scan for arguments setting known formats, e.g., "-elf".
-		 * If "argcp" is non-NULL, delete these arguments from the
-		 * list and update the argument count in "*argcp".
-		 */
-		for (dst = src = argv;  *src != NULL;  src++) {
-			if ((*src)[0] == '-') {
-				const char **p;
-
-				for (p = known_formats;  *p != NULL;  p++)
-					if (strcmp(*src + 1, *p) == 0)
-						break;
-				if (*p != NULL) {
-					fmt = *p;
-					if (argcp == NULL)  /* Don't delete */
-						*dst++ = *src;
-				} else
-					*dst++ = *src;
-			} else
-				*dst++ = *src;
-		}
-		*dst = NULL;
-		if (argcp != NULL)
-			*argcp -= src - dst;
-		if (fmt != NULL)
-			return copyformat(buf, fmt, bufsize);
-	}
-
-	/* Check the OBJFORMAT environment variable. */
-	if ((env = getenv("OBJFORMAT")) != NULL)
-		return copyformat(buf, env, bufsize);
-
-	/* Take a look at "/etc/objformat". */
-	if ((fp = fopen(PATH_OBJFORMAT, "r")) != NULL) {
-		char line[1024];
-		int found;
-		int len;
-
-		found = len = 0;
-		while (fgets(line, sizeof line, fp) != NULL) {
-			if (strncmp(line, "OBJFORMAT=", 10) == 0) {
-				char *p = &line[10];
-
-				p[strcspn(p, " \t\n")] = '\0';
-				len = copyformat(buf, p, bufsize);
-				found = 1;
-			}
-		}
-		fclose(fp);
-		if (found)
-			return len;
-	}
-
-	/* As a last resort, use the compiled in default. */
-	return copyformat(buf, OBJFORMAT_DEFAULT, bufsize);
+	if (bufsize < 4)
+		return -1;
+	strcpy(buf, "elf");
+	return 3;
 }
diff --git a/lib/libc/gmon/gmon.c b/lib/libc/gmon/gmon.c
index 34dc9360a766..95302202da5e 100644
--- a/lib/libc/gmon/gmon.c
+++ b/lib/libc/gmon/gmon.c
@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 
 #include "libc_private.h"
 
-#if defined(__ELF__) && (defined(__i386__) || defined(__sparc64__))
+#if defined(__i386__) || defined(__sparc64__)
 extern char *minbrk asm (".minbrk");
 #else
 extern char *minbrk asm ("minbrk");
diff --git a/lib/libc/i386/SYS.h b/lib/libc/i386/SYS.h
index 5a636f8b33b9..1483f9d8e763 100644
--- a/lib/libc/i386/SYS.h
+++ b/lib/libc/i386/SYS.h
@@ -58,8 +58,4 @@
 /* gas messes up offset -- although we don't currently need it, do for BCS */
 #define	LCALL(x,y)	.byte 0x9a ; .long y; .word x
 
-#ifdef __ELF__
-#define KERNCALL	int $0x80	/* Faster */
-#else
-#define KERNCALL	LCALL(7,0)	/* The old way */
-#endif
+#define KERNCALL	int $0x80