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进入用户模式（系统调用存在page fault的bug）
This commit is contained in:
fslongjin
parent
c09c6d4e66
commit
dacc29310f
@ -22,7 +22,7 @@ enum CMOSTimeSelector
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int rtc_get_cmos_time(struct rtc_time_t *t)
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{
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// 为防止中断请求打断该过程，需要先关中断
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cli();
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//cli();
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uint8_t status_register_B = read_cmos(0x0B); // 读取状态寄存器B
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bool is_24h = ((status_register_B & 0x02) ? true : false); // 判断是否启用24小时模式
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@ -53,6 +53,6 @@ int rtc_get_cmos_time(struct rtc_time_t *t)
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if ((!is_24h) && t->hour & 0x80) // 将十二小时制转为24小时
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t->hour = ((t->hour & 0x7f) + 12) % 24;
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sti();
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//sti();
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return 0;
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}
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@ -104,9 +104,11 @@ Err_Code:
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// 系统调用入口
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// 保存寄存器
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ENTRY(system_call)
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// 由于sysenter指令会禁用中断，因此要在这里手动开启中断
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sti;
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hlt
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subq $0x38, %rsp
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cld;
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@ -137,6 +139,7 @@ ENTRY(system_call)
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// 将rsp作为参数传递给system_call_function
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movq %rsp, %rdi
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callq system_call_function
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@ -145,33 +148,29 @@ ENTRY(system_call)
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ENTRY(ret_from_system_call)
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movq %rax, 0x80(%rsp) // 将当前rax的值先存到栈中rax的位置
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rbx
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popq %rcx
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popq %rdx
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popq %rsi
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popq %rdi
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popq %rbp
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popq %rax // 不允许直接pop到ds
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movq %rax, %ds
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popq %rax
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movq %rax, %es
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popq %rax
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addq $0x38, %rsp
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.byte 0x48
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sysexit
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rbx
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popq %rcx
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popq %rdx
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popq %rsi
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popq %rdi
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popq %rbp
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popq %rax
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movq %rax, %ds
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popq %rax
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movq %rax, %es
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popq %rax
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addq $0x38, %rsp
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.byte 0x48
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sysexit
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// 0 #DE 除法错误
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@ -168,7 +168,7 @@ void do_stack_segment_fault(struct pt_regs *regs, unsigned long error_code)
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// 13 #GP 通用保护性异常
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void do_general_protection(struct pt_regs *regs, unsigned long error_code)
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{
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hlt();
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kerror("do_general_protection(13),\tError Code:%#18lx,\tRSP:%#18lx,\tRIP:%#18lx\n", error_code, regs->rsp, regs->rip);
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if (error_code & 0x01)
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printk_color(RED, BLACK, "The exception occurred during delivery of an event external to the program,such as an interrupt or an earlier exception.\n");
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@ -192,7 +192,7 @@ void do_general_protection(struct pt_regs *regs, unsigned long error_code)
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// 14 #PF 页故障
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void do_page_fault(struct pt_regs *regs, unsigned long error_code)
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{
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hlt();
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unsigned long cr2 = 0;
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__asm__ __volatile__("movq %%cr2, %0":"=r"(cr2)::"memory");
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@ -164,7 +164,7 @@ void mm_init()
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if (z->zone_addr_start >= 0x100000000 && (!ZONE_UNMAPPED_INDEX))
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ZONE_UNMAPPED_INDEX = i;
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}
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kdebug("ZONE_DMA_INDEX=%d\tZONE_NORMAL_INDEX=%d\tZONE_UNMAPPED_INDEX=%d", ZONE_DMA_INDEX, ZONE_NORMAL_INDEX, ZONE_UNMAPPED_INDEX);
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//kdebug("ZONE_DMA_INDEX=%d\tZONE_NORMAL_INDEX=%d\tZONE_UNMAPPED_INDEX=%d", ZONE_DMA_INDEX, ZONE_NORMAL_INDEX, ZONE_UNMAPPED_INDEX);
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// 设置内存页管理结构的地址，预留了一段空间，防止内存越界。
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memory_management_struct.end_of_struct = (ul)((ul)memory_management_struct.zones_struct + memory_management_struct.zones_struct_len + sizeof(long) * 32) & (~(sizeof(long) - 1));
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@ -174,7 +174,7 @@ void mm_init()
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// 初始化内存管理单元结构所占的物理页的结构体
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ul mms_max_page = (virt_2_phys(memory_management_struct.end_of_struct) >> PAGE_2M_SHIFT); // 内存管理单元所占据的序号最大的物理页
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kdebug("mms_max_page=%ld", mms_max_page);
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//kdebug("mms_max_page=%ld", mms_max_page);
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struct Page *tmp_page = NULL;
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ul page_num;
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@ -191,11 +191,11 @@ void mm_init()
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global_CR3 = get_CR3();
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// root_page_table_phys_addr = global_CR3;
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kdebug("global_CR3\t:%#018lx", global_CR3);
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kdebug("*global_CR3\t:%#018lx", *phys_2_virt(global_CR3) & (~0xff));
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kdebug("**global_CR3\t:%#018lx", *phys_2_virt(*phys_2_virt(global_CR3) & (~0xff)) & (~0xff));
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//kdebug("global_CR3\t:%#018lx", global_CR3);
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//kdebug("*global_CR3\t:%#018lx", *phys_2_virt(global_CR3) & (~0xff));
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//kdebug("**global_CR3\t:%#018lx", *phys_2_virt(*phys_2_virt(global_CR3) & (~0xff)) & (~0xff));
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kdebug("1.memory_management_struct.bmp:%#018lx\tzone->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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//kdebug("1.memory_management_struct.bmp:%#018lx\tzone->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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//kinfo("Cleaning page table remapping at 0x0000");
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kinfo("Memory management unit initialize complete!");
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@ -374,7 +374,7 @@ ul slab_init()
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page_init(page, PAGE_KERNEL_INIT | PAGE_KERNEL | PAGE_PGT_MAPPED);
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}
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kdebug("2.memory_management_struct.bmp:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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//kdebug("2.memory_management_struct.bmp:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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// 为slab内存池对象分配内存空间
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ul *virt = NULL;
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@ -395,7 +395,7 @@ ul slab_init()
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kmalloc_cache_group[i].cache_pool_entry->vaddr = virt;
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}
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kdebug("3.memory_management_struct.bmp:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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//kdebug("3.memory_management_struct.bmp:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
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kinfo("SLAB initialized successfully!");
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@ -8,6 +8,7 @@
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#include <mm/slab.h>
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#include <sched/sched.h>
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extern void system_call(void);
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/**
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* @brief 切换进程
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*
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@ -20,24 +21,20 @@
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void __switch_to(struct process_control_block *prev, struct process_control_block *next)
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{
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initial_tss[0].rsp0 = next->thread->rbp;
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kdebug("phys_2_virt(TSS64_Table)=%#018lx", phys_2_virt(TSS64_Table));
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set_tss64((uint *)phys_2_virt(TSS64_Table), initial_tss[0].rsp0, initial_tss[0].rsp1, initial_tss[0].rsp2, initial_tss[0].ist1,
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initial_tss[0].ist2, initial_tss[0].ist3, initial_tss[0].ist4, initial_tss[0].ist5, initial_tss[0].ist6, initial_tss[0].ist7);
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kdebug("prev->thread=%#018lx", prev->thread);
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kdebug("next->thread=%#018lx", next->thread);
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__asm__ __volatile__("movq %%fs, %0 \n\t"
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: "=a"(prev->thread->fs)::"memory");
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__asm__ __volatile__("movq %%gs, %0 \n\t"
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: "=a"(prev->thread->gs)::"memory");
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kdebug("&next->thread->fs=%#018lx", &(next->thread->fs));
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__asm__ __volatile__("movq %0, %%fs \n\t" ::"a"(next->thread->fs)
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: "memory");
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__asm__ __volatile__("movq %0, %%gs \n\t" ::"a"(next->thread->gs)
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: "memory");
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wrmsr(0x175, next->thread->rbp);
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kdebug("prev->thread->rsp0:%#018lx\n", prev->thread->rbp);
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kdebug("next->thread->rsp0:%#018lx\n", next->thread->rbp);
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}
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@ -52,17 +49,20 @@ void user_level_function()
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// kinfo("Try to enter syscall id 15...");
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// enter_syscall(15, 0, 0, 0, 0, 0, 0, 0, 0);
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//enter_syscall(SYS_PRINTF, (ul) "test_sys_printf\n", 0, 0, 0, 0, 0, 0, 0);
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long ret = 0;
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// color_printk(RED,BLACK,"user_level_function task is running\n");
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char string[]="Hello World!\n";
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// enter_syscall(SYS_PRINTF, (ul) "test_sys_printf\n", 0, 0, 0, 0, 0, 0, 0);
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long ret = 0;
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// color_printk(RED,BLACK,"user_level_function task is running\n");
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__asm__ __volatile__ ( "leaq sysexit_return_address(%%rip), %%rdx \n\t"
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"movq %%rsp, %%rcx \n\t"
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"sysenter \n\t"
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"sysexit_return_address: \n\t"
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:"=a"(ret):"0"(1),"D"(string):"memory");
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//kinfo("Return from syscall id 15...");
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char string[] = "Hello World!\n";
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__asm__ __volatile__("leaq sysexit_return_address(%%rip), %%rdx \n\t"
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"movq %%rsp, %%rcx \n\t"
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"sysenter \n\t"
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"sysexit_return_address: \n\t"
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: "=a"(ret)
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: "0"(1), "D"(string)
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: "memory", "rcx", "rdx", "r14");
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// kinfo("Return from syscall id 15...");
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while (1)
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;
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@ -90,9 +90,9 @@ ul do_execve(struct pt_regs *regs)
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uint64_t addr = 0x800000UL;
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unsigned long * tmp = phys_2_virt((unsigned long *)((unsigned long)get_CR3() & (~0xfffUL)) + (( addr>> PAGE_GDT_SHIFT) & 0x1ff));
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unsigned long *tmp = phys_2_virt((unsigned long *)((unsigned long)get_CR3() & (~0xfffUL)) + ((addr >> PAGE_GDT_SHIFT) & 0x1ff));
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unsigned long * virtual = kmalloc(PAGE_4K_SIZE, 0);
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unsigned long *virtual = kmalloc(PAGE_4K_SIZE, 0);
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set_pml4t(tmp, mk_pml4t(virt_2_phys(virtual), PAGE_USER_PGT));
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tmp = phys_2_virt((unsigned long *)(*tmp & (~0xfffUL)) + ((addr >> PAGE_1G_SHIFT) & 0x1ff));
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@ -105,9 +105,10 @@ ul do_execve(struct pt_regs *regs)
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flush_tlb();
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/*
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mm_map_phys_addr_user(addr, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE);
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*/ if (!(current_pcb->flags & PF_KTHREAD))
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/*
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mm_map_phys_addr_user(addr, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE);
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*/
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if (!(current_pcb->flags & PF_KTHREAD))
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current_pcb->addr_limit = KERNEL_BASE_LINEAR_ADDR;
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// 将程序代码拷贝到对应的内存中
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memcpy((void *)0x800000, user_level_function, 1024);
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@ -247,29 +248,36 @@ void process_init()
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initial_mm.brk_start = 0;
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initial_mm.brk_end = memory_management_struct.kernel_end;
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initial_mm.stack_start = *(ul *)phys_2_virt(&_stack_start);
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// 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
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wrmsr(0x174, KERNEL_CS);
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// 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）
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wrmsr(0x175, current_pcb->thread->rbp);
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// 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。
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wrmsr(0x176, (ul)system_call);
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// 初始化进程和tss
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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);
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initial_tss[0].rsp0 = initial_thread.rbp;
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/*
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kdebug("initial_thread.rbp=%#018lx", initial_thread.rbp);
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kdebug("initial_tss[0].rsp1=%#018lx", initial_tss[0].rsp1);
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kdebug("initial_tss[0].ist1=%#018lx", initial_tss[0].ist1);
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*/
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// 初始化进程的循环链表
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list_init(&initial_proc_union.pcb.list);
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current_pcb->flags=0;
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kernel_thread(initial_kernel_thread, 10, CLONE_FS | CLONE_FILES | CLONE_SIGNAL); // 初始化内核进程
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initial_proc_union.pcb.state = PROC_RUNNING;
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// 获取新的进程的pcb
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struct process_control_block *p = container_of(list_next(¤t_pcb->list), struct process_control_block, list);
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// struct process_control_block *p = container_of(list_next(¤t_pcb->list), struct process_control_block, list);
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kdebug("Ready to switch...");
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// 切换到新的内核线程
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switch_proc(current_pcb, p);
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// switch_proc(current_pcb, p);
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}
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/**
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@ -296,6 +304,8 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
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// 将当前进程的pcb复制到新的pcb内
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*tsk = *current_pcb;
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kdebug("current_pcb->flags=%#010lx", current_pcb->flags);
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// 将进程加入循环链表
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list_init(&tsk->list);
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@ -306,6 +316,7 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
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// 将线程结构体放置在pcb的后面
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struct thread_struct *thd = (struct thread_struct *)(tsk + 1);
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memset(thd, 0, sizeof(struct thread_struct));
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tsk->thread = thd;
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// 将寄存器信息存储到进程的内核栈空间的顶部
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@ -321,6 +332,10 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
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// 若进程不是内核层的进程，则跳转到ret from system call
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if (!(tsk->flags & PF_KTHREAD))
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thd->rip = regs->rip = (ul)ret_from_system_call;
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else
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kdebug("is kernel proc.");
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kdebug("ret_from_system_call=%#018lx", (ul)ret_from_system_call);
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tsk->state = PROC_RUNNING;
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@ -24,7 +24,7 @@ void smp_init()
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apic_get_ics(ACPI_ICS_TYPE_PROCESSOR_LOCAL_APIC, tmp_vaddr, &total_processor_num);
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kdebug("processor num=%d", total_processor_num);
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//kdebug("processor num=%d", total_processor_num);
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for (int i = 0; i < total_processor_num; ++i)
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proc_local_apic_structs[i] = (struct acpi_Processor_Local_APIC_Structure_t *)(tmp_vaddr[i]);
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@ -56,10 +56,10 @@ void smp_init()
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set_tss_descriptor(10 + (i * 2), (void *)virt_2_phys(cpu_core_info[i].tss_vaddr));
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set_tss64((uint *)cpu_core_info[i].tss_vaddr, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start, cpu_core_info[i].stack_start);
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kdebug("phys_2_virt(GDT_Table)=%#018lx",phys_2_virt(GDT_Table));
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kdebug("GDT Table %#018lx, \t %#018lx", *(ul *)(phys_2_virt(GDT_Table) + 10 + i * 2), *(ul *)(phys_2_virt(GDT_Table) + 10 + i * 2 + 1));
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//kdebug("phys_2_virt(GDT_Table)=%#018lx",phys_2_virt(GDT_Table));
|
||||
//kdebug("GDT Table %#018lx, \t %#018lx", *(ul *)(phys_2_virt(GDT_Table) + 10 + i * 2), *(ul *)(phys_2_virt(GDT_Table) + 10 + i * 2 + 1));
|
||||
// kdebug("(cpu_core_info[i].tss_vaddr)=%#018lx", (cpu_core_info[i].tss_vaddr));
|
||||
kdebug("(cpu_core_info[i].stack_start)=%#018lx", (cpu_core_info[i].stack_start));
|
||||
//kdebug("(cpu_core_info[i].stack_start)=%#018lx", (cpu_core_info[i].stack_start));
|
||||
// 连续发送两次start-up IPI
|
||||
ipi_send_IPI(DEST_PHYSICAL, IDLE, ICR_LEVEL_DE_ASSERT, EDGE_TRIGGER, 0x20, ICR_Start_up, ICR_No_Shorthand, true, proc_local_apic_structs[i]->ACPI_ID);
|
||||
ipi_send_IPI(DEST_PHYSICAL, IDLE, ICR_LEVEL_DE_ASSERT, EDGE_TRIGGER, 0x20, ICR_Start_up, ICR_No_Shorthand, true, proc_local_apic_structs[i]->ACPI_ID);
|
||||
@ -111,7 +111,7 @@ void smp_ap_start()
|
||||
load_TR(10 + current_starting_cpu * 2);
|
||||
|
||||
sti();
|
||||
kdebug("IDT_addr = %#018lx", phys_2_virt(IDT_Table));
|
||||
//kdebug("IDT_addr = %#018lx", phys_2_virt(IDT_Table));
|
||||
memset(current_pcb, 0, sizeof(struct process_control_block));
|
||||
spin_unlock(&multi_core_starting_lock);
|
||||
while (1) // 这里要循环hlt，原因是当收到中断后，核心会被唤醒，处理完中断之后不会自动hlt
|
||||
|
||||
@ -27,8 +27,10 @@ void syscall_init()
|
||||
// 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);
|
||||
|
||||
}
|
||||
|
||||
long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7)
|
||||
@ -65,10 +67,11 @@ long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, u
|
||||
*/
|
||||
ul sys_printf(struct pt_regs *regs)
|
||||
{
|
||||
while(1);
|
||||
if(regs->r9 == 0 &®s->r10 == 0)
|
||||
printk((char*)regs->r8);
|
||||
else printk_color(regs->r9, regs->r10, (char*)regs->r8);
|
||||
|
||||
//if(regs->r9 == 0 &®s->r10 == 0)
|
||||
// printk((char*)regs->r8);
|
||||
//else printk_color(regs->r9, regs->r10, (char*)regs->r8);
|
||||
printk_color(BLACK,WHITE,(char *)regs->rdi);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user