c-bf-optimise.s

来自「一个编译器的例子,基于c语言,在linux下开发 现在了简单的c语言例子」· S 代码 · 共 86 行

				# start of the file
.include "defines.h"		# system call numbers
.include "c-bf-optimise.literals"	# include the string literal file
	.global _start	
	.bss
	.align	4
_data:
.text
	.align	4
_start:
	pushl %ebp		# save the ebp address
	movl %esp, %ebp
	subl $8, %esp		# allocate space for local variables
	leal -4(%ebp), %eax
	pushl %eax
	movl $5, %eax		# operand int value
	pushl %eax
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	leal -8(%ebp), %eax
	pushl %eax
	movl $10, %eax		# operand int value
	pushl %eax
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	leal -4(%ebp), %eax
	pushl %eax
	movl -4(%ebp), %eax
	pushl %eax
	movl $5, %eax		# operand int value
	pushl %eax
				# arithmetic calculate
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	movl $5, %eax		# operand int value
	pushl %eax
	movl $6, %eax		# operand int value
	pushl %eax
				# arithmetic calculate
	popl %ebx
	popl %eax
	imull %ebx, %eax
	pushl %eax
				# arithmetic calculate
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	movl -4(%ebp), %eax
	pushl %eax
	popl %eax
	cmpl $0, %eax
	je ELSElabel0
	movl -4(%ebp),%eax		# get the integer value of the ID
	call ishow
	movl $SYS_write, %eax		# print a "newline"
	movl $STDOUT, %ebx
	movl $newline, %ecx
	movl $nl_length, %edx
	int $0x80
	jmp ENDIFlabel0
ELSElabel0:
ENDIFlabel0:
	movl $0, %eax		# operand int value
	pushl %eax
	popl %eax		# save the return value in eax
	movl %ebp, %esp
	popl %ebp		# restore the ebp address
	movl $SYS_exit,%eax	# load the exit call number
	movl $0,%ebx		# load the exit code
	int $0x80		# and exit!
				# end of the file