Backed out previous commit (alignment suitable for RELENG_4) as planned

since it has been MFC'ed.  See the log message for the previous commit
for more details.  The alignment bug in gcc-3 has not been fixed, but
it is not very serious and the previous commit just moved it (as intended).

Approved by:	re (murray)

lib/csu/amd64/crt1.c

@@ -100,40 +100,7 @@ _start(char *ap, ...)
 	monstartup(&eprol, &etext);
 #endif
 	_init();
-#ifndef __GNUC__
 	exit( main(argc, argv, env) );
-#else
-	/*
-	 * Some versions of gcc-2 expect the stack frame to be aligned as
-	 * follows after it is set up in main():
-	 *
-	 *  +--------------+ <--- aligned by PREFERRED_STACK_BOUNDARY
-	 *  +%ebp (if any) +
-	 *  +--------------+
-	 *  |return address|
-	 *  +--------------+
-	 *  |  arguments   |
-	 *  |      :       |
-	 *  |      :       |
-	 *  +--------------+
-	 *
-	 * We implement the above to fix just the usual case in FreeBSD-4.
-	 * Alignment for main() is too compiler-dependent to handle correctly
-	 * in all cases here (or in the kernel).  E.g., a different alignment
-	 * is required for at least gcc-2.95.4 even for the small variation
-	 * of compiling main() with -fomit-frame-pointer.
-	 */
-	__asm__("
-	andl	$~0xf, %%esp		# align stack to 16-byte boundary
-	subl	$12+12, %%esp		# space for args and padding
-	movl	%0, 0(%%esp)
-	movl	%1, 4(%%esp)
-	movl	%2, 8(%%esp)
-	call	main
-	movl	%%eax, 0(%%esp)
-	call	exit
-	" : : "r" (argc), "r" (argv), "r" (env) : "ax", "cx", "dx", "memory");
-#endif
 }
 
 #ifdef GCRT

lib/csu/i386-elf/crt1.c

@@ -100,40 +100,7 @@ _start(char *ap, ...)
 	monstartup(&eprol, &etext);
 #endif
 	_init();
-#ifndef __GNUC__
 	exit( main(argc, argv, env) );
-#else
-	/*
-	 * Some versions of gcc-2 expect the stack frame to be aligned as
-	 * follows after it is set up in main():
-	 *
-	 *  +--------------+ <--- aligned by PREFERRED_STACK_BOUNDARY
-	 *  +%ebp (if any) +
-	 *  +--------------+
-	 *  |return address|
-	 *  +--------------+
-	 *  |  arguments   |
-	 *  |      :       |
-	 *  |      :       |
-	 *  +--------------+
-	 *
-	 * We implement the above to fix just the usual case in FreeBSD-4.
-	 * Alignment for main() is too compiler-dependent to handle correctly
-	 * in all cases here (or in the kernel).  E.g., a different alignment
-	 * is required for at least gcc-2.95.4 even for the small variation
-	 * of compiling main() with -fomit-frame-pointer.
-	 */
-	__asm__("
-	andl	$~0xf, %%esp		# align stack to 16-byte boundary
-	subl	$12+12, %%esp		# space for args and padding
-	movl	%0, 0(%%esp)
-	movl	%1, 4(%%esp)
-	movl	%2, 8(%%esp)
-	call	main
-	movl	%%eax, 0(%%esp)
-	call	exit
-	" : : "r" (argc), "r" (argv), "r" (env) : "ax", "cx", "dx", "memory");
-#endif
 }
 
 #ifdef GCRT