boot1_arch.h

它通过提供glibc兼容使得应用程序移植到较小的c 库时相当得容易. 它能够应用到带虚拟存储的Linux和uClinux上.在大多数带MMU部件的平台上为使它更加紧凑,它也能够编译成共享库.uClib

/* Any assmbly language/system dependent hacks needed to setup boot1.c so it
 * will work as expected and cope with whatever platform specific wierdness is
 * needed for this architecture.  */

/* Overrive the default _dl_boot function, and replace it with a bit of asm.
 * Then call the real _dl_boot function, which is now named _dl_boot2. */

asm("" \
"	.text\n"			\
"	.globl	_dl_boot\n"		\
"_dl_boot:\n"				\
"	mr	3,1\n"			\
"	addi	1,1,-16\n"		\
"	bl      _dl_boot2\n"		\
".previous\n"				\
);

#define _dl_boot _dl_boot2
#define LD_BOOT(X)   static void *  __attribute__ ((unused)) _dl_boot (X)