在 《Linux C一站式编程》中有这样一个问题:
.section .data
.section .text
.globl _start
_start:
movl $1, %eax # this is the linux kernel command
# number (system call) for exiting
# a program
movl $4, %ebx # this is the status number we will
# return to the operating system.
# Change this around and it will
# return different things to
# echo $?
int $0x80 # this wakes up the kernel to run
# the exit command
在上面的汇编代码中,如果将 int $0x80
这一句去掉,也能够编译链接成功,但是却会导致一个段错误,请问这是为什么?
谢谢大家了~
This is an interrupt. The operating system (this int 80 is under Linux) is fixed. It is recommended to use
SYSENTER
. Then if there is noSYSENTER
orSYSEXIT
at the end of a call, of course an error will be reported.Go to Google for its function. I won’t be a porter. After all, I haven’t had any contact with it for a long time.