kiukotsu / ucore Goto Github PK

执行brew tap altkatz/homebrew-gcc_cross_compilers报错，请问有解决方法吗

windows环境包中，qemu加上-S选项后显示Guest has not initialized the display (yet)。
而不加-S选项时是可以正常工作的，但是gdb也连不上。在visualbox虚拟机上则完全没有问题。所以基本判断就是qemu版本问题，无论哪种选项都是gdb连不起来。
我这边试了官网20210415这个版本，显示Guest has not initialized the display (yet)后，gdb能连上，并且continue以后能正常调试。qemu 2022最近发布的版本则不行，估计是刚发布还不够稳定。

gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0

My build of ucore kernel won't start properly and enters a reboot cycle. I compared my build with a working build and found that the GDT Descriptor that's used in pmm_init() is replaced with zero value when memset(edata, 0, end - edata) is performed.

Disassembly shows that the pmm.o has the GDT Descriptor in section .data.rel.local rather than .data.
After linking, this address is put after .data section in Kernel. This means that the edata symbol defining the end of the .data section will appear before the GDT Descriptor.

//linker script producing the issue
.data : {
    *(.data)
}
PROVIDE(edata = .);

Modify the linker script and make all data type section before edata symble will fix the issue and the kernel will run fine.

//modified linker script
.data : {
    *(.data.*)
}
PROVIDE(edata = .);