mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-09 02:46:47 +00:00
694 lines
18 KiB
C
694 lines
18 KiB
C
#include "syscall.h"
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#include "../process/process.h"
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#include <exception/gate.h>
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#include <exception/irq.h>
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#include <driver/disk/ahci/ahci.h>
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#include <mm/slab.h>
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#include <common/errno.h>
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#include <common/fcntl.h>
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#include <filesystem/fat32/fat32.h>
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#include <filesystem/VFS/VFS.h>
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#include <driver/keyboard/ps2_keyboard.h>
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#include <process/process.h>
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// 导出系统调用入口函数，定义在entry.S中
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extern void system_call(void);
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extern void syscall_int(void);
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/**
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* @brief 导出系统调用处理函数的符号
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*
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*/
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#define SYSCALL_COMMON(syscall_num, symbol) extern unsigned long symbol(struct pt_regs *regs);
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SYSCALL_COMMON(0, system_call_not_exists); // 导出system_call_not_exists函数
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#undef SYSCALL_COMMON // 取消前述宏定义
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/**
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* @brief 重新定义为：把系统调用函数加入系统调用表
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* @param syscall_num 系统调用号
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* @param symbol 系统调用处理函数
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*/
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#define SYSCALL_COMMON(syscall_num, symbol) [syscall_num] = symbol,
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/**
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* @brief sysenter的系统调用函数，从entry.S中跳转到这里
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*
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* @param regs 3特权级下的寄存器值,rax存储系统调用号
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* @return ul 对应的系统调用函数的地址
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*/
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ul system_call_function(struct pt_regs *regs)
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{
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return system_call_table[regs->rax](regs);
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}
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/**
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* @brief 初始化系统调用模块
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*
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*/
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void syscall_init()
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{
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kinfo("Initializing syscall...");
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set_system_trap_gate(0x80, 0, syscall_int); // 系统调用门
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}
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/**
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* @brief 通过中断进入系统调用
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*
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* @param syscall_id
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* @param arg0
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* @param arg1
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* @param arg2
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* @param arg3
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* @param arg4
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* @param arg5
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* @param arg6
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* @param arg7
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* @return long
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*/
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long enter_syscall_int(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7)
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{
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long err_code;
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__asm__ __volatile__(
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"movq %2, %%r8 \n\t"
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"movq %3, %%r9 \n\t"
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"movq %4, %%r10 \n\t"
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"movq %5, %%r11 \n\t"
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"movq %6, %%r12 \n\t"
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"movq %7, %%r13 \n\t"
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"movq %8, %%r14 \n\t"
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"movq %9, %%r15 \n\t"
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"int $0x80 \n\t"
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: "=a"(err_code)
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: "a"(syscall_id), "m"(arg0), "m"(arg1), "m"(arg2), "m"(arg3), "m"(arg4), "m"(arg5), "m"(arg6), "m"(arg7)
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: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
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return err_code;
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}
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/**
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* @brief 打印字符串的系统调用
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*
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* 当arg1和arg2均为0时，打印黑底白字，否则按照指定的前景色和背景色来打印
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*
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* @param regs 寄存器
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* @param arg0 要打印的字符串
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* @param arg1 前景色
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* @param arg2 背景色
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* @return ul 返回值
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*/
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ul sys_put_string(struct pt_regs *regs)
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{
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printk_color(regs->r9, regs->r10, (char *)regs->r8);
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// printk_color(BLACK, WHITE, (char *)regs->r8);
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return 0;
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}
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uint64_t sys_open(struct pt_regs *regs)
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{
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char *filename = (char *)(regs->r8);
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int flags = (int)(regs->r9);
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// kdebug("filename=%s", filename);
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long path_len = strnlen_user(filename, PAGE_4K_SIZE) + 1;
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if (path_len <= 0) // 地址空间错误
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{
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return -EFAULT;
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}
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else if (path_len >= PAGE_4K_SIZE) // 名称过长
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{
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return -ENAMETOOLONG;
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}
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// 为待拷贝文件路径字符串分配内存空间
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char *path = (char *)kmalloc(path_len, 0);
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if (path == NULL)
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return -ENOMEM;
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memset(path, 0, path_len);
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strncpy_from_user(path, filename, path_len);
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// 寻找文件
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struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
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// if (dentry != NULL)
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// printk_color(ORANGE, BLACK, "Found %s\nDIR_FstClus:%#018lx\tDIR_FileSize:%#018lx\n", path, ((struct fat32_inode_info_t *)(dentry->dir_inode->private_inode_info))->first_clus, dentry->dir_inode->file_size);
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// else
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// printk_color(ORANGE, BLACK, "Can`t find file\n");
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kfree(path);
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if (dentry == NULL)
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return -ENOENT;
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// 要求打开文件夹而目标不是文件夹
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if ((flags & O_DIRECTORY) && (dentry->dir_inode->attribute != VFS_ATTR_DIR))
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return -ENOTDIR;
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// 要找的目标是文件夹
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if ((flags & O_DIRECTORY) && dentry->dir_inode->attribute == VFS_ATTR_DIR)
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return -EISDIR;
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// todo: 引入devfs后删除这段代码
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// 暂时遇到设备文件的话，就将其first clus设置为特定值
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if (path_len >= 5 && filename[0] == '/' && filename[1] == 'd' && filename[2] == 'e' && filename[3] == 'v' && filename[4] == '/')
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{
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// 对于fat32文件系统上面的设备文件，设置其起始扇区
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((struct fat32_inode_info_t *)(dentry->dir_inode->private_inode_info))->first_clus |= 0xf0000000;
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dentry->dir_inode->sb->sb_ops->write_inode(dentry->dir_inode);
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dentry->dir_inode->attribute |= VFS_ATTR_DEVICE;
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}
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// 创建文件描述符
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struct vfs_file_t *file_ptr = (struct vfs_file_t *)kmalloc(sizeof(struct vfs_file_t), 0);
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memset(file_ptr, 0, sizeof(struct vfs_file_t));
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int errcode = -1;
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file_ptr->dEntry = dentry;
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file_ptr->mode = flags;
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// todo: 接入devfs
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// 特判一下是否为键盘文件
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if (dentry->dir_inode->attribute & VFS_ATTR_DEVICE)
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{
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file_ptr->file_ops = &ps2_keyboard_fops; // 如果是设备文件，暂时认为它是键盘文件
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}
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else
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file_ptr->file_ops = dentry->dir_inode->file_ops;
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// 如果文件系统实现了打开文件的函数
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if (file_ptr->file_ops && file_ptr->file_ops->open)
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errcode = file_ptr->file_ops->open(dentry->dir_inode, file_ptr);
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if (errcode != VFS_SUCCESS)
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{
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kfree(file_ptr);
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return -EFAULT;
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}
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if (file_ptr->mode & O_TRUNC) // 清空文件
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file_ptr->dEntry->dir_inode->file_size = 0;
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if (file_ptr->mode & O_APPEND)
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file_ptr->position = file_ptr->dEntry->dir_inode->file_size;
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else
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file_ptr->position = 0;
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struct vfs_file_t **f = current_pcb->fds;
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int fd_num = -1;
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// 在指针数组中寻找空位
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// todo: 当pcb中的指针数组改为动态指针数组之后，需要更改这里（目前还是静态指针数组）
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for (int i = 0; i < PROC_MAX_FD_NUM; ++i)
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{
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if (f[i] == NULL) // 找到指针数组中的空位
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{
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fd_num = i;
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break;
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}
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}
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// 指针数组没有空位了
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if (fd_num == -1)
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{
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kfree(file_ptr);
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return -EMFILE;
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}
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// 保存文件描述符
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f[fd_num] = file_ptr;
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return fd_num;
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}
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/**
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* @brief 关闭文件系统调用
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*
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* @param fd_num 文件描述符号
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*
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* @param regs
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* @return uint64_t
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*/
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uint64_t sys_close(struct pt_regs *regs)
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{
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int fd_num = (int)regs->r8;
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// kdebug("sys close: fd=%d", fd_num);
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// 校验文件描述符范围
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if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
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return -EBADF;
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// 文件描述符不存在
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if (current_pcb->fds[fd_num] == NULL)
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return -EBADF;
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struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
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uint64_t ret;
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// If there is a valid close function
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if (file_ptr->file_ops && file_ptr->file_ops->close)
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ret = file_ptr->file_ops->close(file_ptr->dEntry->dir_inode, file_ptr);
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kfree(file_ptr);
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current_pcb->fds[fd_num] = NULL;
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return 0;
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}
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/**
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* @brief 从文件中读取数据
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*
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* @param fd_num regs->r8 文件描述符号
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* @param buf regs->r9 输出缓冲区
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* @param count regs->r10 要读取的字节数
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*
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* @return uint64_t
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*/
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uint64_t sys_read(struct pt_regs *regs)
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{
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int fd_num = (int)regs->r8;
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void *buf = (void *)regs->r9;
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int64_t count = (int64_t)regs->r10;
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// kdebug("sys read: fd=%d", fd_num);
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// 校验文件描述符范围
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if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
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return -EBADF;
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// 文件描述符不存在
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if (current_pcb->fds[fd_num] == NULL)
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return -EBADF;
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if (count < 0)
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return -EINVAL;
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struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
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uint64_t ret;
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if (file_ptr->file_ops && file_ptr->file_ops->read)
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ret = file_ptr->file_ops->read(file_ptr, (char *)buf, count, &(file_ptr->position));
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return ret;
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}
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/**
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* @brief 向文件写入数据
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*
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* @param fd_num regs->r8 文件描述符号
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* @param buf regs->r9 输入缓冲区
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* @param count regs->r10 要写入的字节数
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*
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* @return uint64_t
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*/
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uint64_t sys_write(struct pt_regs *regs)
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{
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int fd_num = (int)regs->r8;
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void *buf = (void *)regs->r9;
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int64_t count = (int64_t)regs->r10;
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kdebug("sys write: fd=%d", fd_num);
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// 校验文件描述符范围
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if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
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return -EBADF;
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// 文件描述符不存在
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if (current_pcb->fds[fd_num] == NULL)
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return -EBADF;
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if (count < 0)
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return -EINVAL;
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struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
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uint64_t ret;
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if (file_ptr->file_ops && file_ptr->file_ops->write)
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ret = file_ptr->file_ops->write(file_ptr, (char *)buf, count, &(file_ptr->position));
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return ret;
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}
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/**
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* @brief 调整文件的访问位置
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*
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* @param fd_num 文件描述符号
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* @param offset 偏移量
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* @param whence 调整模式
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* @return uint64_t 调整结束后的文件访问位置
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*/
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uint64_t sys_lseek(struct pt_regs *regs)
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{
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int fd_num = (int)regs->r8;
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long offset = (long)regs->r9;
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int whence = (int)regs->r10;
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// kdebug("sys_lseek: fd=%d", fd_num);
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uint64_t retval = 0;
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// 校验文件描述符范围
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if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
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return -EBADF;
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// 文件描述符不存在
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if (current_pcb->fds[fd_num] == NULL)
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return -EBADF;
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struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
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if (file_ptr->file_ops && file_ptr->file_ops->lseek)
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retval = file_ptr->file_ops->lseek(file_ptr, offset, whence);
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return retval;
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}
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uint64_t sys_fork(struct pt_regs *regs)
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{
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// kdebug("sys_fork");
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return do_fork(regs, 0, regs->rsp, 0);
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}
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uint64_t sys_vfork(struct pt_regs *regs)
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{
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kdebug("sys vfork");
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return do_fork(regs, CLONE_VM | CLONE_FS | CLONE_SIGNAL, regs->rsp, 0);
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}
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/**
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* @brief 将堆内存调整为arg0
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*
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* @param arg0 新的堆区域的结束地址
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* arg0=-1 ===> 返回堆区域的起始地址
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* arg0=-2 ===> 返回堆区域的结束地址
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* @return uint64_t 错误码
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*
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*/
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uint64_t sys_brk(struct pt_regs *regs)
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{
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uint64_t new_brk = PAGE_2M_ALIGN(regs->r8);
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// kdebug("sys_brk input= %#010lx , new_brk= %#010lx bytes current_pcb->mm->brk_start=%#018lx current->end_brk=%#018lx", regs->r8, new_brk, current_pcb->mm->brk_start, current_pcb->mm->brk_end);
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if ((int64_t)regs->r8 == -1)
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{
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// kdebug("get brk_start=%#018lx", current_pcb->mm->brk_start);
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return current_pcb->mm->brk_start;
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}
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if ((int64_t)regs->r8 == -2)
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{
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// kdebug("get brk_end=%#018lx", current_pcb->mm->brk_end);
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return current_pcb->mm->brk_end;
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}
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if (new_brk > current_pcb->addr_limit) // 堆地址空间超过限制
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return -ENOMEM;
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int64_t offset;
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if (new_brk >= current_pcb->mm->brk_end)
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offset = (int64_t)(new_brk - current_pcb->mm->brk_end);
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else
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offset = -(int64_t)(current_pcb->mm->brk_end - new_brk);
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/*
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if (offset < 0)
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{
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kdebug("decrease brk, offset = %#010lx", (uint64_t)(-offset));
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}
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*/
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new_brk = mm_do_brk(current_pcb->mm->brk_end, offset); // 扩展堆内存空间
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current_pcb->mm->brk_end = new_brk;
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return 0;
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}
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/**
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* @brief 将堆内存空间加上offset（注意，该系统调用只应在普通进程中调用，而不能是内核线程）
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*
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* @param arg0 offset偏移量
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* @return uint64_t the previous program break
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*/
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uint64_t sys_sbrk(struct pt_regs *regs)
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{
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uint64_t retval = current_pcb->mm->brk_end;
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if ((int64_t)regs->r8 > 0)
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{
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uint64_t new_brk = PAGE_2M_ALIGN(retval + regs->r8);
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if (new_brk > current_pcb->addr_limit) // 堆地址空间超过限制
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{
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kdebug("exceed mem limit, new_brk = %#018lx", new_brk);
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return -ENOMEM;
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}
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}
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else
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{
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if ((__int128_t)current_pcb->mm->brk_end + (__int128_t)regs->r8 < current_pcb->mm->brk_start)
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return retval;
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}
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// kdebug("do brk");
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uint64_t new_brk = mm_do_brk(current_pcb->mm->brk_end, (int64_t)regs->r8); // 调整堆内存空间
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// kdebug("do brk done, new_brk = %#018lx", new_brk);
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current_pcb->mm->brk_end = new_brk;
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return retval;
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}
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/**
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* @brief 重启计算机
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*
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* @return
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*/
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uint64_t sys_reboot(struct pt_regs *regs)
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||
{
|
||
// 重启计算机
|
||
io_out8(0x64, 0xfe);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* @brief 切换工作目录
|
||
*
|
||
* @param dest_path 目标路径
|
||
* @return
|
||
+--------------+------------------------+
|
||
| 返回码 | 描述 |
|
||
+--------------+------------------------+
|
||
| 0 | 成功 |
|
||
| EACCESS | 权限不足 |
|
||
| ELOOP | 解析path时遇到路径循环 |
|
||
| ENAMETOOLONG | 路径名过长 |
|
||
| ENOENT | 目标文件或目录不存在 |
|
||
| ENODIR | 检索期间发现非目录项 |
|
||
| ENOMEM | 系统内存不足 |
|
||
| EFAULT | 错误的地址 |
|
||
| ENAMETOOLONG | 路径过长 |
|
||
+--------------+------------------------+
|
||
*/
|
||
uint64_t sys_chdir(struct pt_regs *regs)
|
||
{
|
||
char *dest_path = (char *)regs->r8;
|
||
// kdebug("dest_path=%s", dest_path);
|
||
// 检查目标路径是否为NULL
|
||
if (dest_path == NULL)
|
||
return -EFAULT;
|
||
|
||
// 计算输入的路径长度
|
||
int dest_path_len = strnlen_user(dest_path, PAGE_4K_SIZE);
|
||
|
||
// 长度小于等于0
|
||
if (dest_path_len <= 0)
|
||
return -EFAULT;
|
||
else if (dest_path_len >= PAGE_4K_SIZE)
|
||
return -ENAMETOOLONG;
|
||
|
||
// 为路径字符串申请空间
|
||
char *path = kmalloc(dest_path_len + 1, 0);
|
||
// 系统内存不足
|
||
if (path == NULL)
|
||
return -ENOMEM;
|
||
|
||
memset(path, 0, dest_path_len + 1);
|
||
|
||
// 将字符串从用户空间拷贝进来, +1是为了拷贝结尾的\0
|
||
strncpy_from_user(path, dest_path, dest_path_len + 1);
|
||
|
||
struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
|
||
|
||
kfree(path);
|
||
|
||
if (dentry == NULL)
|
||
return -ENOENT;
|
||
|
||
// 目标不是目录
|
||
if (dentry->dir_inode->attribute != VFS_ATTR_DIR)
|
||
return -ENOTDIR;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* @brief 获取目录中的数据
|
||
*
|
||
* @param fd 文件描述符号
|
||
* @return uint64_t
|
||
*/
|
||
uint64_t sys_getdents(struct pt_regs *regs)
|
||
{
|
||
int fd = (int)regs->r8;
|
||
void *dirent = (void *)regs->r9;
|
||
long count = (long)regs->r10;
|
||
|
||
if (fd < 0 || fd > PROC_MAX_FD_NUM)
|
||
return -EBADF;
|
||
|
||
if (count < 0)
|
||
return -EINVAL;
|
||
|
||
struct vfs_file_t *filp = current_pcb->fds[fd];
|
||
if (filp == NULL)
|
||
return -EBADF;
|
||
|
||
uint64_t retval = 0;
|
||
if (filp->file_ops && filp->file_ops->readdir)
|
||
retval = filp->file_ops->readdir(filp, dirent, &vfs_fill_dentry);
|
||
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* @brief 执行新的程序
|
||
*
|
||
* @param user_path(r8寄存器) 文件路径
|
||
* @param argv(r9寄存器) 参数列表
|
||
* @return uint64_t
|
||
*/
|
||
uint64_t sys_execve(struct pt_regs *regs)
|
||
{
|
||
// kdebug("sys_execve");
|
||
char *user_path = (char *)regs->r8;
|
||
char **argv = (char **)regs->r9;
|
||
|
||
int path_len = strnlen_user(user_path, PAGE_4K_SIZE);
|
||
|
||
// kdebug("path_len=%d", path_len);
|
||
if (path_len >= PAGE_4K_SIZE)
|
||
return -ENAMETOOLONG;
|
||
else if (path_len <= 0)
|
||
return -EFAULT;
|
||
|
||
char *path = (char *)kmalloc(path_len + 1, 0);
|
||
if (path == NULL)
|
||
return -ENOMEM;
|
||
|
||
memset(path, 0, path_len + 1);
|
||
|
||
// kdebug("before copy file path from user");
|
||
// 拷贝文件路径
|
||
strncpy_from_user(path, user_path, path_len);
|
||
path[path_len] = '\0';
|
||
|
||
// kdebug("before do_execve, path = %s", path);
|
||
// 执行新的程序
|
||
uint64_t retval = do_execve(regs, path, argv, NULL);
|
||
|
||
kfree(path);
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* @brief 等待进程退出
|
||
*
|
||
* @param pid 目标进程id
|
||
* @param status 返回的状态信息
|
||
* @param options 等待选项
|
||
* @param rusage
|
||
* @return uint64_t
|
||
*/
|
||
uint64_t sys_wait4(struct pt_regs *regs)
|
||
{
|
||
uint64_t pid = regs->r8;
|
||
int *status = (int *)regs->r9;
|
||
int options = regs->r10;
|
||
void *rusage = (void*)regs->r11;
|
||
|
||
struct process_control_block *proc = NULL;
|
||
struct process_control_block *child_proc = NULL;
|
||
|
||
// 查找pid为指定值的进程
|
||
// ps: 这里判断子进程的方法没有按照posix 2008来写。
|
||
// todo: 根据进程树判断是否为当前进程的子进程
|
||
for (proc = &initial_proc_union.pcb; proc->next_pcb != &initial_proc_union.pcb; proc = proc->next_pcb)
|
||
{
|
||
if (proc->next_pcb->pid == pid)
|
||
{
|
||
child_proc = proc->next_pcb;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (child_proc == NULL)
|
||
return -ECHILD;
|
||
|
||
// 暂时不支持options选项，该值目前必须为0
|
||
if (options != 0)
|
||
return -EINVAL;
|
||
|
||
// 如果子进程没有退出，则等待其退出
|
||
while (child_proc->state != PROC_ZOMBIE)
|
||
wait_queue_sleep_on_interriptible(¤t_pcb->wait_child_proc_exit);
|
||
|
||
// 拷贝子进程的返回码
|
||
*status = child_proc->exit_code;
|
||
// copy_to_user(status, (void*)child_proc->exit_code, sizeof(int));
|
||
proc->next_pcb = child_proc->next_pcb;
|
||
|
||
// 释放子进程的页表
|
||
process_exit_mm(child_proc);
|
||
// 释放子进程的pcb
|
||
kfree(child_proc);
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* @brief 进程退出
|
||
*
|
||
* @param exit_code 退出返回码
|
||
* @return uint64_t
|
||
*/
|
||
uint64_t sys_exit(struct pt_regs * regs)
|
||
{
|
||
return process_do_exit(regs->r8);
|
||
}
|
||
|
||
ul sys_ahci_end_req(struct pt_regs *regs)
|
||
{
|
||
ahci_end_request();
|
||
return 0;
|
||
}
|
||
|
||
// 系统调用的内核入口程序
|
||
void do_syscall_int(struct pt_regs *regs, unsigned long error_code)
|
||
{
|
||
|
||
ul ret = system_call_table[regs->rax](regs);
|
||
regs->rax = ret; // 返回码
|
||
}
|
||
|
||
system_call_t system_call_table[MAX_SYSTEM_CALL_NUM] =
|
||
{
|
||
[0] = system_call_not_exists,
|
||
[1] = sys_put_string,
|
||
[2] = sys_open,
|
||
[3] = sys_close,
|
||
[4] = sys_read,
|
||
[5] = sys_write,
|
||
[6] = sys_lseek,
|
||
[7] = sys_fork,
|
||
[8] = sys_vfork,
|
||
[9] = sys_brk,
|
||
[10] = sys_sbrk,
|
||
[11] = sys_reboot,
|
||
[12] = sys_chdir,
|
||
[13] = sys_getdents,
|
||
[14] = sys_execve,
|
||
[15] = sys_wait4,
|
||
[16] = sys_exit,
|
||
[17 ... 254] = system_call_not_exists,
|
||
[255] = sys_ahci_end_req};
|