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进入用户模式（系统调用存在page fault的bug）

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This commit is contained in:
fslongjin
2022-04-11 10:32:39 +08:00
parent c09c6d4e66
commit dacc29310f
9 changed files with 96 additions and 79 deletions
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71
kernel/process/process.c
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@ -8,6 +8,7 @@
#include <mm/slab.h>
#include <sched/sched.h>
extern void system_call(void);
/**
* @brief 切换进程
*
@ -20,24 +21,20 @@
void __switch_to(struct process_control_block *prev, struct process_control_block *next)
{
initial_tss[0].rsp0 = next->thread->rbp;
kdebug("phys_2_virt(TSS64_Table)=%#018lx", phys_2_virt(TSS64_Table));
set_tss64((uint *)phys_2_virt(TSS64_Table), initial_tss[0].rsp0, initial_tss[0].rsp1, initial_tss[0].rsp2, initial_tss[0].ist1,
initial_tss[0].ist2, initial_tss[0].ist3, initial_tss[0].ist4, initial_tss[0].ist5, initial_tss[0].ist6, initial_tss[0].ist7);
kdebug("prev->thread=%#018lx", prev->thread);
kdebug("next->thread=%#018lx", next->thread);
__asm__ __volatile__("movq %%fs, %0 \n\t"
: "=a"(prev->thread->fs)::"memory");
__asm__ __volatile__("movq %%gs, %0 \n\t"
: "=a"(prev->thread->gs)::"memory");
kdebug("&next->thread->fs=%#018lx", &(next->thread->fs));
__asm__ __volatile__("movq %0, %%fs \n\t" ::"a"(next->thread->fs)
: "memory");
__asm__ __volatile__("movq %0, %%gs \n\t" ::"a"(next->thread->gs)
: "memory");
wrmsr(0x175, next->thread->rbp);
kdebug("prev->thread->rsp0:%#018lx\n", prev->thread->rbp);
kdebug("next->thread->rsp0:%#018lx\n", next->thread->rbp);
}
@ -51,18 +48,21 @@ void user_level_function()
// kinfo("Program (user_level_function) is runing...");
// kinfo("Try to enter syscall id 15...");
// 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);
long ret = 0;
// color_printk(RED,BLACK,"user_level_function task is running\n");
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");
//kinfo("Return from syscall id 15...");
// enter_syscall(SYS_PRINTF, (ul) "test_sys_printf\n", 0, 0, 0, 0, 0, 0, 0);
long ret = 0;
// color_printk(RED,BLACK,"user_level_function task is running\n");
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...");
while (1)
;
@ -89,10 +89,10 @@ ul do_execve(struct pt_regs *regs)
// 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);
uint64_t addr = 0x800000UL;
unsigned long * tmp = phys_2_virt((unsigned long *)((unsigned long)get_CR3() & (~0xfffUL)) + (( addr>> PAGE_GDT_SHIFT) & 0x1ff));
unsigned long * virtual = kmalloc(PAGE_4K_SIZE, 0);
unsigned long *tmp = phys_2_virt((unsigned long *)((unsigned long)get_CR3() & (~0xfffUL)) + ((addr >> PAGE_GDT_SHIFT) & 0x1ff));
unsigned long *virtual = kmalloc(PAGE_4K_SIZE, 0);
set_pml4t(tmp, mk_pml4t(virt_2_phys(virtual), PAGE_USER_PGT));
tmp = phys_2_virt((unsigned long *)(*tmp & (~0xfffUL)) + ((addr >> PAGE_1G_SHIFT) & 0x1ff));
@ -105,9 +105,10 @@ ul do_execve(struct pt_regs *regs)
flush_tlb();
/*
mm_map_phys_addr_user(addr, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE);
*/ if (!(current_pcb->flags & PF_KTHREAD))
/*
mm_map_phys_addr_user(addr, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE);
*/
if (!(current_pcb->flags & PF_KTHREAD))
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);
@ -247,29 +248,36 @@ void process_init()
initial_mm.brk_start = 0;
initial_mm.brk_end = memory_management_struct.kernel_end;
initial_mm.stack_start = *(ul *)phys_2_virt(&_stack_start);
// 向MSR寄存器组中的 IA32_SYSENTER_CS寄存器写入内核的代码段的地址
wrmsr(0x174, KERNEL_CS);
// 向MSR寄存器组中的 IA32_SYSENTER_ESP寄存器写入内核进程的rbp（在syscall入口中会将rsp减去相应的数值）
wrmsr(0x175, current_pcb->thread->rbp);
// 向MSR寄存器组中的 IA32_SYSENTER_EIP寄存器写入系统调用入口的地址。
wrmsr(0x176, (ul)system_call);
// 初始化进程和tss
set_tss64((uint *)phys_2_virt(TSS64_Table), initial_thread.rbp, initial_tss[0].rsp1, initial_tss[0].rsp2, initial_tss[0].ist1, initial_tss[0].ist2, initial_tss[0].ist3, initial_tss[0].ist4, initial_tss[0].ist5, initial_tss[0].ist6, initial_tss[0].ist7);
initial_tss[0].rsp0 = initial_thread.rbp;
/*
kdebug("initial_thread.rbp=%#018lx", initial_thread.rbp);
kdebug("initial_tss[0].rsp1=%#018lx", initial_tss[0].rsp1);
kdebug("initial_tss[0].ist1=%#018lx", initial_tss[0].ist1);
*/
// 初始化进程的循环链表
list_init(&initial_proc_union.pcb.list);
current_pcb->flags=0;
kernel_thread(initial_kernel_thread, 10, CLONE_FS | CLONE_FILES | CLONE_SIGNAL); // 初始化内核进程
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
switch_proc(current_pcb, p);
// switch_proc(current_pcb, p);
}
/**
@ -296,6 +304,8 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
// 将当前进程的pcb复制到新的pcb内
*tsk = *current_pcb;
kdebug("current_pcb->flags=%#010lx", current_pcb->flags);
// 将进程加入循环链表
list_init(&tsk->list);
@ -306,6 +316,7 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
// 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
@ -321,6 +332,10 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
// 若进程不是内核层的进程，则跳转到ret from system call
if (!(tsk->flags & PF_KTHREAD))
thd->rip = regs->rip = (ul)ret_from_system_call;
else
kdebug("is kernel proc.");
kdebug("ret_from_system_call=%#018lx", (ul)ret_from_system_call);
tsk->state = PROC_RUNNING;