linux汇编语言的call指令
agtma 2013-04-11 03:27:18 学习系统调用,编了一个程序
void main()
{
write(1, "hello\n", 6);
exit(0);
}
下面是生成的汇编代码
.file "syscall.c"
.section .rodata
.LC0:
.string "hello\n"
.text
.globl main
.type main, @function
main:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
movq %rsp, %rbp
.cfi_offset 6, -16
.cfi_def_cfa_register 6
movl $6, %edx
movl $.LC0, %esi
movl $1, %edi
movl $0, %eax
call write //请问这句调用的write,具体是怎么实现的?书里面介绍的,是用int $0x80这个陷阱来实现的系统调用,这个write对int $0x80封装了么?去哪里找?
movl $0, %edi
call exit //这句也一样
.cfi_endproc
.LFE0:
.size main, .-main
.ident "GCC: (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5"
.section .note.GNU-stack,"",@progbits
希望会的朋友指点!谢谢了!