写x86_64的Linux内核模块汇编 [英] Writing x86_64 linux kernel module in assembler
问题描述
我试着写在NASM简单的内核模块(V3.6),但insmod的说我:
I try write simple kernel module (v3.6) in nasm, but insmod say me:
$ sudo insmod ./hello.ko
insmod: ERROR: could not insert module ./hello.ko: Invalid module format
$ echo $?
1
我编译我的code有:
I compile my code with:
$ nasm -f elf64 -o hello.m hello.asm
$ ld -m elf_x86_64 -r -o hello.ko hello.m
和我的模块code:
section .modinfo
__mod_kernel_version db "kernel_version=3.6.8", 0
__mod_license db "license=GPL", 0
__mod_author db "author=actics", 0
__mod_description db "description=hello world module in nasm", 0
section .data
init_mess db "init_module", 10, 0
cleanup_mess db "cleanup_module", 10, 0
section .text
global init_module
global cleanup_module
extern printk
init_module:
push rbp
mov rbp, rsp
xor rax, rax
mov rdi, init_mess
call printk
xor rax, rax
mov rsp, rbp
pop rbp
ret
cleanup_module:
push rbp
mov rbp, rsp
xor rax, rax
mov rdi, cleanup_mess
call printk
xor rax, rax
mov rsp, rbp
pop rbp
ret
请帮忙。在互联网络我发现等于code 1链接2.4,但他不工作太
我的系统 - 的archlinux与3.6.8内核
Please help. In internets i found 1 link with equal code for 2.4, but he doesnt work too My system - archlinux with 3.6.8 kernel
更新:
在NASM论坛上,我找到有趣的解决方案线程。这对我的工作,如果我的模块做回0并退出:)但如果我尝试添加外部的printk的insmod的说我接下来的:
UPDATE: in nasm forum i find thread with interesting solution. It's work for me, if my module do return 0 and exit :) But if i try add "extern printk" the insmod say me next:
ERROR: could not insert module hello.ko: Invalid parameters
我在做什么错了?我的code:
What i'm doing wrong? my code:
[bits 64]
global init_module
global cleanup_module
;extern printk
section .modinfo
__mod_description8 db 'description=Simple module',0
align 16,db 0
__mod_author7 db 'author=That´s me',0
__mod_license6 db 'license=GPL',0
align 16,db 0
__module_depends db 'depends=',0
align 32,db 0
__mod_vermagic5 db 'vermagic=3.6.8-1-ARCH SMP preempt mod_unload modversions ',0 ;from a .ko module of my system
section __versions
____versions db 0xdf, 0xbc, 0xbf, 0x8c, 0, 0, 0, 0, "module_layout" ;from a .ko module of my system
align 64,db 0
section .data
init_mess db "init_module", 10, 0
cleanup_mess db "cleanup_module", 10, 0
section .text
init_module:
xor rax, rax
ret
cleanup_module:
xor rax, rax
ret
section .gnu.linkonce.this_module
times 24 db 0
__name: db 'Simple', 0
times (0x168 - 24 - 7) db 0
__init_module: dq init_module
times 0x2ac db 0
__cleanup_module: dq cleanup_module
times 1152 db 0
本code的工作:
NASM -f ELF64 hello.asm -o hello.o
this code work with: nasm -f elf64 hello.asm -o hello.o
但如果我取消printk该文件没有工作!)
but if i uncomment printk this no working!)
推荐答案
我所做的是使用标准的模块宏写一个小C包装并就该写在ASM主模块code链接。正常使用的内核构建系统来构建它。
What I did was write a small C wrapper using the standard module macros and link it with the main module code that's written in asm. Use the normal kernel build system to build it.
的的module.c:的
#include <linux/module.h>
MODULE_AUTHOR("A. U. Thor");
MODULE_DESCRIPTION("Description");
MODULE_LICENSE("GPL");
extern int asm_init(void);
int main_init(void)
{
return asm_init();
}
module_init(main_init);
的 main.asm中:的
[bits 64]
global asm_init
asm_init:
xor rax, rax
ret
的的Makefile:的
obj-m += test.o
test-objs := module.o main.o
$(KBUILD_EXTMOD)/main.o: main.asm
nasm -f elf64 -o $@ $^
构建使用命令:让-C&LT; path_to_kernel_src&GT; M = $ PWD
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