Linux0.12内核代码中文注释+在高版本GCC 5.4.0 + Ubuntu 16.04中编译成功并在Bochs正常测试运行
Home Page: https://github.com/sky-big/Linux-0.12
Linux0.12内核代码中文注释 + 在高版本GCC 5.4.0 + Ubuntu 16.04
编译结果如下:
运行结果如下:
运行环境下载地址: http://oldlinux.org/Linux.old/bochs/linux-0.12-080324.zip
ss
編譯完成 產生的Kernel_Image如何放入tool/linux-0.12-080324.zip 取代原本的核心？
我直接把Kernel_Image 重新命名為bootimage-0.12-hd取代原本的bootimage-0.12-hd無法正常運作
你好，我最近在自学内核代码，我看到你的代码中对一些内联函数进行了寄存器的保护，例如对memory.c中copy_page(from, to)的操作，但是在我的测试情况下
#include <stdio.h>
#define copy_page(from,to) \
__asm__( \
"cld ; rep ; movsl" \
: \
:"S" (from),"D" (to),"c" (1024) \
: \
)
int main(){
copy_page(100, 200);
return 0;
}汇编出来的代码为
main:
.LFB0:
.cfi_startproc
pushl %ebp
.cfi_def_cfa_offset 8
.cfi_offset 5, -8
movl %esp, %ebp
.cfi_def_cfa_register 5
pushl %edi
pushl %esi
.cfi_offset 7, -12
.cfi_offset 6, -16
call __x86.get_pc_thunk.ax
addl $_GLOBAL_OFFSET_TABLE_, %eax
movl $100, %eax
movl $200, %edx
movl $1024, %ecx
movl %eax, %esi
movl %edx, %edi
#APP
# 13 "asm_in_c.c" 1
cld ; rep ; movsl
# 0 "" 2
#NO_APP
movl $0, %eax
popl %esi
.cfi_restore 6
popl %edi
.cfi_restore 7
popl %ebp
.cfi_restore 5
.cfi_def_cfa 4, 4
ret
.cfi_endproc可以看到编译器好像自动保护了寄存器。
请问，当时是出于什么考虑加上了寄存器保护，或者还是受到gcc版本影响（我的gcc版本为7），是否有必要加入寄存器保护？
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