crt0.s

klibc精简化的c程序库

	.align 4

	.import $global$, data
	.import __libc_init, code

	.global _start
	.export _start, ENTRY
	.type _start,@function

	.proc
	.callinfo

_start:
/* extend the stack by 64-bytes */
	ldo	64(%sp), %sp

/* %r25 = argc
 * %r24 = argv
 * envp = argv + (argc + 1)
 * elfdata = (argv - 4)
 */
	ldo	-4(%r24), %r26

/* load global data */
	ldil	L%$global$, %dp
	ldo	R%$global$(%dp), %dp

/* parisc abi puts the atexit pointer in %r23, see ELF_PLAT_INIT() */
	copy	%r23, %r25

/* branch to __libc_init */
	bl	__libc_init,%r2
	nop
/* break miserably if we ever return */
	iitlbp	%r0,(%sr0,%r0) /* illegal instruction */
	nop
	.procend