First, you can find libaio source in http://libaio.sourcearchive.com/
Second,download the libaio_0.3.109.orig.tar.gz version source,unzip it
Than you can find the real source in src directory.
But there is lack of mips architecture support.
So I just write some ugly patch about it.
The key is a .h file.You can name it syscall-mips.h
here is the code :
/****************BEGIN*************************/
#define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "memory"
#define io_syscall1(type,fname,sname,type1,arg1)
type fname (type1 arg1)
{
long _sys_result;
register long __v0 asm("$2");
register long __a0 asm("$4") = arg1;
register long __a1 asm("$7");
__asm__ __volatile__(
".set push
"
".set noreorder
"
"li %0, %2
"
"syscall
"
".set pop
"
:"=r"(__v0),"=r"(__a1)
:"i" (__NR_##sname),"r"(__a0)
: __SYSCALL_CLOBBERS
);
_sys_result = __v0;
_sys_result;
}
#define io_syscall2(type,fname,sname,type1,arg1,type2,arg2)
type fname (type1 arg1,type2 arg2)
{
long _sys_result;
register long __v0 asm("$2");
register long __a0 asm("$4") = arg1;
register long __a1 asm("$5") = arg2;
register long __a2 asm("$7");
__asm__ __volatile__(
".set push
"
".set noreorder
"
"li %0, %2
"
"syscall
"
".set pop
"
:"=r"(__v0),"=r"(__a2)
:"i" (__NR_##sname),"r"(__a0),"r"(__a1)
: __SYSCALL_CLOBBERS
);
_sys_result = __v0;
_sys_result;
}
#define io_syscall3(type,fname,sname,type1,arg1,type2,arg2,type3,arg3)
type fname (type1 arg1,type2 arg2,type3 arg3)
{
long _sys_result;
register long __v0 asm("$2");
register long __a0 asm("$4") = arg1;
register long __a1 asm("$5") = arg2;
register long __a2 asm("$6") = arg3;
register long __a3 asm("$7");
__asm__ __volatile__(
".set push
"
".set noreorder
"
"li %0, %2
"
"syscall
"
".set pop
"
:"=r"(__v0),"=r"(__a3)
:"i" (__NR_##sname),"r"(__a0),"r"(__a1),"r"(__a2)
: __SYSCALL_CLOBBERS
);
_sys_result = __v0;
_sys_result;
}
#define io_syscall5(type,fname,sname,type1,arg1,type2,arg2,type3,arg3,type4,arg4,
type5,arg5)
type fname (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)
{
long _sys_result;
register long __v0 asm("$2");
register long __a0 asm("$4") = arg1;
register long __a1 asm("$5") = arg2;
register long __a2 asm("$6") = arg3;
register long __a3 asm("$7") = arg4;
register long __a4 asm("$8") = arg5;
register long __a5 asm("$9");
__asm__ __volatile__(
".set push
"
".set noreorder
"
"li %0, %2
"
"syscall
"
".set pop
"
:"=r"(__v0),"=r"(__a5)
:"i" (__NR_##sname),"r"(__a0),"r"(__a1),"r"(__a2),"r"(__a3) ,"r"(__a4)
: __SYSCALL_CLOBBERS
);
_sys_result = __v0;
_sys_result;
}
/****************END*************************/
That is All.They are the most important part. The rest is just relsove compile problem.
Like somewhere is missing the mips definition, somewhere is missing the .h name.
Remeber change the CC in Makefile, use mips-gcc.
Finally,just run make command,you will get a static lib which is named "libaio.a"
I use it to work with fio tools,it's work for me.Hope it's useful to you.
今天想用一下fio在mips架构下，修改fio代码，将mips相关的地方补全，主要是缺少mips定义，还有一些头文件方面的问题。
最后发现链接的时候提示找不到libaio库。搜索了一下，在http://libaio.sourcearchive.com/下载了libaio的代码。
然后解压准备编译一个mips版本，结果悲剧的发现libaio不支持mips架构，简单的分析了一下源码，发现原来就差一个头文件，用来
定义在mips架构下，用户态如何进入内核的翻译，这个是和架构强相关的。
简单开始google和stackoverflow了一把，没有什么有用的发现。分析了一下x86和x86_64架构的头文件，发现还算简单。
于是准备自己写一下，google一下mips的ABI接口，然后又搜索了一下系统调用的实现，然后就完成了上面的头文件的主要内容。
主要就是利用系统调用的接口，是linux内核支持的aio相关的调用，通过寄存器传入多个参数到内核。
剩下的就是解决libaio本身的编译问题，注意一下，这部分代码会有编译告警，分析一下，主要是类型转换方面的，我决定不管了^_^
编译得到了libaio.a。下一步是将libaio.a拷贝到库目录中去。编译通过后，到mips环境下试了一下，ok成功了。