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修复init进程忘记设定fs gs寄存器的问题。 (#132)

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2022-12-31 18:43:05 +08:00
committed by GitHub
parent 74bde36e01
commit 843e442971
1 changed files with 14 additions and 1 deletions
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15
kernel/src/process/process.c
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@ -21,8 +21,8 @@
#include <exception/gate.h>
#include <filesystem/devfs/devfs.h>
#include <filesystem/fat32/fat32.h>
#include <filesystem/rootfs/rootfs.h>
#include <filesystem/procfs/procfs.h>
#include <filesystem/rootfs/rootfs.h>
#include <ktest/ktest.h>
#include <mm/slab.h>
#include <sched/sched.h>
@ -123,6 +123,18 @@ void __switch_to(struct process_control_block *prev, struct process_control_bloc
}
#pragma GCC pop_options
/**
* @brief 切换进程的fs、gs寄存器
* 注意，fs、gs的值在return的时候才会生效，因此本函数不能简化为一个单独的宏
* @param fs 目标fs值
* @param gs 目标gs值
*/
void process_switch_fsgs(uint64_t fs, uint64_t gs)
{
asm volatile("movq %0, %%fs \n\t" ::"a"(fs));
asm volatile("movq %0, %%gs \n\t" ::"a"(gs));
}
/**
* @brief 打开要执行的程序文件
*
@ -504,6 +516,7 @@ ul initial_kernel_thread(ul arg)
current_pcb->thread->fs = USER_DS | 0x3;
barrier();
current_pcb->thread->gs = USER_DS | 0x3;
process_switch_fsgs(current_pcb->thread->fs, current_pcb->thread->gs);
// 主动放弃内核线程身份
current_pcb->flags &= (~PF_KTHREAD);