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Code Issues Releases Wiki Activity

改用int250作为系统调用

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This commit is contained in:
fslongjin
2022-04-12 11:54:44 +08:00
parent 011246281a
commit 2d7b2b7048
15 changed files with 236 additions and 104 deletions
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55
kernel/process/process.c
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@ -32,12 +32,12 @@ void __switch_to(struct process_control_block *prev, struct process_control_bloc
__asm__ __volatile__("movq %0, %%fs \n\t" ::"a"(next->thread->fs));
__asm__ __volatile__("movq %0, %%gs \n\t" ::"a"(next->thread->gs));
wrmsr(0x175, next->thread->rbp);
kdebug("next=%#018lx", next);
kdebug("initial_tss[0].rsp1=%#018lx", initial_tss[0].rsp1);
kdebug("prev->thread->rsp0:%#018lx\n", prev->thread->rbp);
kdebug("next->thread->rsp0:%#018lx\n", next->thread->rbp);
kdebug("next->thread->rip:%#018lx\n", next->thread->rip);
// kdebug("next=%#018lx", next);
// kdebug("initial_tss[0].rsp1=%#018lx", initial_tss[0].rsp1);
// kdebug("prev->thread->rsp0:%#018lx\n", prev->thread->rbp);
// kdebug("next->thread->rsp0:%#018lx\n", next->thread->rbp);
// kdebug("next->thread->rip:%#018lx\n", next->thread->rip);
}
/**
@ -51,20 +51,35 @@ void user_level_function()
// enter_syscall(15, 0, 0, 0, 0, 0, 0, 0, 0);
// enter_syscall(SYS_PRINTF, (ul) "test_sys_printf\n", 0, 0, 0, 0, 0, 0, 0);
//while(1);
long ret = 0;
// color_printk(RED,BLACK,"user_level_function task is running\n");
while(1);
char string[] = "Hello World!\n";
/*
__asm__ __volatile__("leaq sysexit_return_address(%%rip), %%rdx \n\t"
"movq %%rsp, %%rcx \n\t"
"sysenter \n\t"
"sysexit_return_address: \n\t"
: "=a"(ret)
: "0"(1), "D"(string)
: "memory", "rcx", "rdx", "r14");
// kinfo("Return from syscall id 15...");
: "memory");
*/
for (int i = 0; i < 10; ++i)
{
long err_code;
ul addr = (ul)string;
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"int $250 \n\t"
: "=a"(err_code)
: "a"(SYS_PRINTF), "m"(addr)
: "memory", "r8");
}
// enter_syscall_int(SYS_PRINTF, (ul) "test_sys_printf\n", 0, 0, 0, 0, 0, 0, 0);
// kinfo("Return from syscall id 15...");
while (1)
;
@ -85,7 +100,7 @@ ul do_execve(struct pt_regs *regs)
regs->ds = 0;
regs->es = 0;
kdebug("do_execve is running...");
// kdebug("do_execve is running...");
// 映射起始页面
// mm_map_proc_page_table(get_CR3(), true, 0x800000, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
@ -114,7 +129,9 @@ ul do_execve(struct pt_regs *regs)
current_pcb->addr_limit = KERNEL_BASE_LINEAR_ADDR;
// 将程序代码拷贝到对应的内存中
memcpy((void *)0x800000, user_level_function, 1024);
kdebug("program copied!");
// kdebug("program copied!");
return 0;
}
@ -126,7 +143,7 @@ ul do_execve(struct pt_regs *regs)
*/
ul initial_kernel_thread(ul arg)
{
kinfo("initial proc running...\targ:%#018lx", arg);
// kinfo("initial proc running...\targ:%#018lx", arg);
struct pt_regs *regs;
@ -136,7 +153,7 @@ ul initial_kernel_thread(ul arg)
// memset((void*)current_pcb->mm->pgd, 0, PAGE_4K_SIZE);
regs = (struct pt_regs *)current_pcb->thread->rsp;
kdebug("current_pcb->thread->rsp=%#018lx", current_pcb->thread->rsp);
// kdebug("current_pcb->thread->rsp=%#018lx", current_pcb->thread->rsp);
current_pcb->flags = 0;
// 将返回用户层的代码压入堆栈，向rdx传入regs的地址，然后jmp到do_execve这个系统调用api的处理函数 这里的设计思路和switch_proc类似
__asm__ __volatile__("movq %1, %%rsp \n\t"
@ -226,8 +243,8 @@ int kernel_thread(unsigned long (*fn)(unsigned long), unsigned long arg, unsigne
// rip寄存器指向内核线程的引导程序
regs.rip = (ul)kernel_thread_func;
kdebug("kernel_thread_func=%#018lx", kernel_thread_func);
kdebug("&kernel_thread_func=%#018lx", &kernel_thread_func);
// kdebug("kernel_thread_func=%#018lx", kernel_thread_func);
// kdebug("&kernel_thread_func=%#018lx", &kernel_thread_func);
return do_fork(&regs, flags, 0, 0);
}
@ -277,7 +294,7 @@ void process_init()
initial_proc_union.pcb.state = PROC_RUNNING;
// 获取新的进程的pcb
// struct process_control_block *p = container_of(list_next(&current_pcb->list), struct process_control_block, list);
struct process_control_block *p = container_of(list_next(&current_pcb->list), struct process_control_block, list);
kdebug("Ready to switch...");
// 切换到新的内核线程
@ -317,12 +334,13 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
tsk->priority = 2;
++(tsk->pid);
tsk->state = PROC_UNINTERRUPTIBLE;
list_init(&tsk->list);
list_add(&initial_proc_union.pcb.list, &tsk->list);
// 将线程结构体放置在pcb的后面
struct thread_struct *thd = (struct thread_struct *)(tsk + 1);
memset(thd, 0, sizeof(struct thread_struct));
tsk->thread = thd;
// 将寄存器信息存储到进程的内核栈空间的顶部
memcpy((void *)((ul)tsk + STACK_SIZE - sizeof(struct pt_regs)), regs, sizeof(struct pt_regs));
@ -333,7 +351,6 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
thd->fs = KERNEL_DS;
thd->gs = KERNEL_DS;
kdebug("do_fork() thd->rsp=%#018lx", thd->rsp);
// 若进程不是内核层的进程，则跳转到ret from system call
if (!(tsk->flags & PF_KTHREAD))