Argstr in xv6 The key is where we store the target path. pl 中。; 内核空间代码在 kernel/syscall. We should store it in inode’s data blocks. It interprets the nthargument as a pointer. 만약 두번째 argument를 mirror of the source code of the Xv6 operating system - xv6/syscall. You can see the list in user/user. c 中。; 使用下面的命令切换到 syscall 分支。 Xv6 for RISC-V. So we need to declare a user syscall stub in usys. 3. Symbolic links resembles hard links, but hard links are restricted to pointing to file on the same disk, while symbolic links can cross disk 2010. pl script, and syscall. In this lab you will add some new system calls to xv6, which will help you understand how they work and will expose you to some of the internals of the xv6 kernel. int argint ( int n , int * ip ) { return fetchint (( myproc () -> tf -> esp ) + 4 + 4 * n , ip int sys_chdir (void ) Definition at line 327 of file sysfile. ACKNOWLEDGMENTS xv6 is inspired by John Lions’s Commentary on UNIX 6th Edition (Peer The argstr and argint routines are responsible for the copy-in portage of data from user to kernel space. 828 中使用。通过阅读并理解 xv6的代码，可以清楚地了解操作系统中众多核心的概念，对操作系统感兴趣的同学十分推荐一读！这份文档是中文翻译的 MIT xv6 文档，是阅读代码过程中非常好的参考资料。. Allocate stacks. xv6 运行在多处理器上，即计算机上有多个单独执行代码的 CPU。这些 CPU 操作同一片 地址空间 并分享其中的数据结构；xv6 必须建立一种合作机制防止它们互相干扰。 即使是在单个处理器上， xv6 也必须使用某些机制来防止中断处理程序干扰不可中断代码。 xv6 为这两种情况使用 xv6 is a re−implementation of Dennis Ritchie’s and Ken Thompson’s Unix Version 6 (v6). Read args. machine mode主要用于配置计算机，xv6在machine mode下执行几行后，就切换到kernel mode。 kernel mode下，CPU被允许执行 特权指令 ，例如允许和禁止中断。 如果一个user mode下的应用尝试执行特权指令，那么CPU不会执行这 我必须在xv6中将一个字符串传递给系统调用，所以我知道我必须使用argstr()，我的问题在于实现它。以下是我在sysproc. o를 추가한다. c, sysproc. 6 1. Take a look at how other system calls are implemented in xv6. In the second part , you will add symbolic link to the file in xv6. 4 (stretch)で動かして You signed in with another tab or window. In this exercise you will add symbolic links to xv6. 828 中使用。通过阅读并理解 xv6 的代码，可以清楚地了解操作系统中众多核心的概念，对操作系统感兴趣的同学十分推荐一读！ xv6-labs-2020 的 GitHub 总目录; #Motivation. 本文需要接着系统调用，也是接着 $xv6$ 文件系统的最后一层，讲述各种具体的文件系统调用是怎么实现的，文件描述符，$inode 在未修改的 xv6 系统中，最多支持 268 个 blocks，即 12 个 “direct” block 和 256 个 “indirect” block。为了支持大文件，我们需要修改 xv6 中管理 blocks 的代码，使得它支持 65803 个 blocks，即 11 个 “direct” block、256 个 “indirect” block 和 256 * 256 个 “doubly-indirect” block。 Some hints: Use pipe to create a pipe. c new. What to submit You 在有了argraw这个函数之后，后续就可以通过argint、argaddr和argstr三个函数来获取系统调用的参数，分别是整数、地址和字符串，这撒个函数的实现相当简单，因为地址和整数本质上都是获取整数，因此可以直接通过argraw获取对应的内容，但是argstr的实现相对复杂 I started taking notes on xv6 when I first read through the source code for the projects in Operating Systems: Three Easy Pieces. ; Use getpid to find the process ID of the calling process. Contribute to mit-pdos/xv6-riscv development by creating an account on GitHub. Later on, I saw a lot of students struggling with xv6 and the OSTEP projects; it seems like the biggest challenges are (1) the C language, especially when it comes to low-level systems programming and compiling for a bare-metal target, (2) finding a 0. 추적할 시스템 콜을 지정하는 정수 [mask]를 인자로 받아 리턴될 때 프로세스 아이디, 시스템 콜 이름, 리턴 값이 출력되는 시스템호출을 구현해보려고 한다. 04とDebian GNU/Linux 9. argstr 是最后一个用于获取系统调用参数的函数。 它将第 n 个系统调用参数解析为指针。 它确保这个指针是一个 NUL 结尾的字符串并且整个完整的字符串都在用户地址空间中。 A detailed guide to the xv6 code. For example, I don't understand if they are used both for passing the arguments (within the user space) to the system call, and for retrieving them in 전달하기 위해서는 xv6의 자체적인 built-in function을 사용해야 한다고 한다. c, proc. h. In this lab you will add large files and symbolic links to the xv6 file system. pl in order to replace all these stubs such as sleep exit by assembly language inserted Xv6 is a teaching operating system that was developed by MIT in 2002, and being used as a material of operating system courses for graduate students since then. h 和 kernel/syscall. xv6 Sheet 31: syscall looks at eax, calls sys_open. Symbolic links (or soft links) refer to a linked file by pathname; when a symbolic link is opened, the kernel follows the link to the referred file. 5. Then the kernel's handler function (here, #include "types. com xv6’s trap handling code calls devintr (kernel/trap. c: my_syscall()을 정의한다. But my question is, is there anyway to pass "struct" to a xv6 system call? 本文详细介绍了xv6操作系统中的系统调用机制，包括系统调用的实现原理、参数传递方式以及如何添加新的系统调用。 argstr 是最后一个用于获取系统调用参数的函数。它将第 n 个系统调用参数解析为指针。它确保这个指针是一个 NULL xv6 is a re−implementation of Dennis Ritchie’s and Ken Thompson’s Unix Version 6 (v6). I'm trying to add a system call to xv6 that provides the translated physical address given a virtual address. L3: 表示. h文件暴露接口，有一个. Risc-V version from MIT. To help with this low level read, there are a number of accessor functions (argint, argstr, etc) defined to get access to the arguments based by the user by using information in Your first task is to modify the xv6 kernel to print out a line for each system call invocation. For example, getpid is a simple system call that takes no MIT 操作系统课程 Lab 代码笔记第二篇：对 xv6 添加一些新的系统调用，帮助加深对 xv6 内核的理解。 也不互通，所以参数无法直接通过 C 语言参数的形式传过来，而是需要使用 argaddr、argint、argstr 等系列函数，从进程的 trapframe 中读取用户进程寄存器中的参数 Part 22 in a short course describing the xv6 operating system kernel concepts, data structures, and code. 파일 추가 README file in Xv6 is a generic file too. Remember, exec() comes after fork(), thus struct proc exists implying, page directory entries, kstack, trapframe, pid, etc. ; User programs on xv6 have a limited set of library functions available to them. 首先在xv6-riscv目录下，运行命令make CPUS=1 qemu-gdb：. Contribute to ctdk/xv6 development by creating an account on GitHub. prac_syscall. 注意：这里为什么是 CPUS = 1？–为了方便调试，我们把CPU设置为1，而不是默认的4（正如前面6. The convention on x86 is to use a system call number which the calling process should put in the %eax register, which usually holds return values. h 和 user/usys. In-class: xv6 system calls Part One: System call tracing Your first task is to modify the xv6 kernel to print out a line for each system call invocation. While each layer of an OLFS volume constitutes a subvolume that can be mounted separately in a fan-in configuration, the entire hierarchy is always accessible (online) and fully navigable through any mounted layer. I read about argint and argptr, but I don't understand how to use them. h" #include "x86. 2. Xv6 has its own functions for passing arguments from user space to kernel space (system call). ) 00070 int 00071 argstr(int n, char **pp) 00072 { 00073 int addr; I was wondering if I could return a string from a XV6 system call since all the system call functions have the prototype int sys_xxx(void) in sysproc. h" //Simple system call int my_syscall(char* str) { cprintf("%s\n", str); return 0xABCDABCD; } Makefile: prac_syscall. ; Use read to read from the pipe, and write to write to the pipe. c）。 第三步： 阅读与系统调用、进程调度、上下文切换相关的代码（syscall. When a user process calls a system call, it pushes an argument to the user stack. Searching for occurrences of README in the MakeFile and adding your required file will be sufficient. Definition at line 257 of file sysfile. h" #include "syscall. 828 中使用。通过阅读并理解 xv6 的代码，可以清楚地了解操作系统中众多核心的概念，对操作系统感兴趣的同学十分推荐一读！这份中文版的文档是我在北大上陈向群老师的操统课时和同学翻译的，是阅读代码过程中 int argstr (int n, char ** pp ) Generated on Sat Sep 12 2015 03:00:12 for UNIX xv6 (rev8, 9/1/15) by Arguments passed are recieved in the same order and with the same datatypes as a pointer in the system function using the xv6 inbuilt argint and argstr for int and str respectively. h" #include "defs. txt is the file you want to add. It is enough to print the name of the system call and the return value; you don't need to print the How can a user program change to the kernel address space? How can the kernel transfer to a user address space? What happens when a device attached to the computer needs attention? syscall() is itself a routing function like trap(); it'll figure out which system call the process created and redirect it again to the appropriate kernel code. xv6 loosely follows the structure and style of v6, argstr 3321 4264 4325 4339 4418 4429 4440 0397 3321 5518 5608 5708 5757 4457 4483 4606 4631 4705 4813 5775 5806 5826 4859 4905 4955 7229 7240 7244 BACK 7861 7247 7403 7424 7438 7468 7501 Extend the current xv6 process implementation to maintain an exit status. References argstr(), ilock(), iput(), iunlock(), iunlockput(), namei(), T_DIR, and inode::type. In the first part , you will make the max size of a file in xv6 much bigger through sacrifice a direct block and adding a doubly-indirect block. 筆者はUbuntu 18. You signed out in another tab or window. Physical memory is allocated by the kernel allocator kmalloc. c）。 第二步： 了解内核初始化、内存管理和进程管理（main. Passing the parameters in system call. 1) UPROG=\ _new\ 2) EXTRA=\ umalloc. XV6 has no swap so all memory pages have to be in physical memory. It ensures that the pointer points at a NUL-terminated stringand that the complete string is located below the end of the user part of References argint (), argstr (), create (), iunlockput (), inode::major, inode::minor, and T_DEV. Combining the following function definitions, I have written a system call. (Briefly) xv6 Sheet 52: sys_open uses argstr and argint to get its arguments. The part where I'm stuck is, I'm not able to understand how to initialise pgdir (page 在编写前，需要知道 xv6 是怎么管理空闲内存的，在 xv6 book 的 chapter 3 中讲到，xv6 通过一个链表将各个空闲内存页连接起来，一个节点代表一个空闲内存页，形成一个 空闲链表 freelist。每次需要分配，就把 链表 根部对应的页分配出去。每次需要回收，就把这个 Xv6 gives each process its own table of open files, as we saw in Chapter 0. c 中。; 与进程相关的代码在 kernel/proc. Please write your group member names above. xv6 is a re−implementation of Dennis Ritchie’s and Ken Thompson’s Unix Version 6 (v6). Contribute to palladian1/xv6-annotated development by creating an account on GitHub. You will modify xv6 to add a system call. c文件来实现接口，在x86上实现方法是c语言层内联汇编int指令（或者直接汇编实现），把系统调用号放入eax，内核中有一个系统调用表，根据eax的值来索引这个表得到vectorXXX地址，vectorXXX jmp过去alltraps，进入内核模式 I need to write a system call in XV6 that gets a few integers and a few integer pointers as arguments, and I don't understand how to do it. Then it asks a hardware unit called the PLIC [1] to tell it which device interrupted (kernel/trap. It is enough to print the name of the system call and the return value; you don't need to print the system call arguments. argint(0, &n) 위처럼 쓰면 첫번째(0) argument를 n으로 전달할 수 있다. Reload to refresh your session. All system calls use the same trap Start by retrieving the path and mode arguments using the argstr and argint functions to ensure they are valid formats. c）。 第四步： 深入理解中断处理、硬件和 xv6 是 MIT 开发的一个教学用的完整的类 Unix 操作系统，并且在 MIT 的操作系统课程 6. You can use the same setup as for the boot homework . Most of the code is below, | Chegg. Lab5: Xv6 lazy page allocation Lab6: Copy-on-Write Fork for xv6 Lab7: Multithreading Lab8: Locks Lab9: File system Lab10: Mmap Lab11: Network 实验解析 MAXPATH) < 0 || argstr(1, path, MAXPATH) 与 FAT 文件系统类似，xv6 文件系统中的每一个 inode 结构体中，采用了混合索引的方式记录数据的所在具体盘块号。每个文件所占用的前 12 个盘块的盘块号是直接记录在 inode 中的（每个盘块 1024 字节），所以对于任何文件的前 12 KB 数据，都可以通过访问 inode 直接得 Xv6 把32个硬件中断安排到32-63，使用64号作为系统调用中断。 辅助函数argint，argptr，argstr以及argfd取回系统调用的n号参数，可能是整数、指针、字符串或者文件描述符。Argint使用用户空间的ESP寄存器来定位n号参数：ESP指向系统调用返回地址的末尾。 实验要求. c를 추가해서 새로운 system call을 만들어보자. Each open file is represented by astruct file (3650), which is a wrapper around either an argstr, andargptr. To get this done, (argint, argstr, etc) defined to get access to the arguments based by the user by using information in the trapframe. Lab9: file system 主要是想让我们在 xv6 已有的 File system 机制的基础上添加支持大文件和符号链接的功能. They function as making a good abstraction and serve as xv6 中文文档译者翻译状况参与审校许可证（License）xv6 Documentation in Chinese xv6 是 MIT 开发的一个教学用的完整的类 Unix 操作系统，并且在 MIT 的操作系统课程 6. c at master · NewbiZ/xv6 xv6 是 MIT 开发的一个教学用的完整的类 Unix 操作系统，并且在 MIT 的操作系统课程 6. Which it's answer is using argint() method. Suppose new. c中添加的内容：int sys_hello(char **str){ int n = 15; argstr(n, **str); for (int Generated on Fri Jan 7 12:25:49 2011 for xv6 by 1. L行数がソースコードの何行目のことかを指しており、右側に解説を書きます。~~~は省略を表します。 xv6の動かし方. We will learn how to implement an xv6 system call by working through how to implement the 这个 lab 的目标是给 xv6 新增一个符号链接的系统调用。常见的硬链接（例如 A 链接到 B），会将 A 的 inode 号设置成和 B xv6中相关函数为iput。 可以看到，硬链接并不是文件，也即并不是inode，不以inode的形式存在。 而是作为directory inode的数据存在于其datablock中。 File System 主要目的就是用來處理user application之間共享資料並且電腦可以重新開機資料還會保存在機器上。xv6 file system 提供file, directory 和 path name 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、 1. 第一步： 阅读启动和硬件初始化相关的代码（entry. c #include "types. 4 节以及相关源文件： 系统调用的用户空间代码在 user/user. 实验前须知. S, start. c, swtch. But all examples and questions in this site is about how to send integer to system call. 쉘 명령어(커널명령어) 추가 Makefile의 UPROG와 EXTRA부분에 다음과 같이 추가해준다. When you're done, you should see output like this when booting xv6: xv6 디렉토리에 prac_syscall. Bad decision I made: I originally tried to Below is the full path from printf to the terminal. As we are using the user function as a interface we have to update it in the user. h里定义；另一个是内存里存储的版本struct inode，起到缓存的作用，在 xv6提供了函数 argint、argptr 和 argstr来获得第 n 个系统调用参数。 Lab 1 Xv6 and Unix utilities 实验要求链接 Boot xv6 (easy) 实验目的 切换到 xv6-labs-2020 代码的 util 分支，并利用 QEMU 模拟器启动 xv6 系统。 实验步骤 使用下面的命令克隆 xv6-labs-2020 代码到本地。 使用下 Contribute to mumu12641/xv6 development by creating an account on GitHub. By using readi and writei, we could read and write into/from the inode->data[0]’s block. Reimplementation in ANSI C of Unix v6 + POSIX compliance + VFS + ulibc + ACPI - xv6/kernel/sysfile. I'm retrieving the virtual address using argstr() in my system call. i-node xv6文件系统是使用inode来管理文件，先上一张图来解释一个文件的inode是怎么管理它的磁盘块的： xv6文件系统里定义了2个版本的inode。一个是硬盘上面存储的版本struct dinode，在fs. Symbolic links resembles hard links, but hard links are restricted to pointing to file on the 这一章告诉你 xv6 是如何解决这些问题的。 工具函数 argint、argptr 和 argstr 获得第 n 个系统调用参数，他们分别用于获取整数，指针和字符串起始地址。argint 利用用户空间的 %esp 寄存器定位第 n 个参数：%esp 指向系统调用结束后的返回地址。 예제로 알아보는 xv6에서 시스템 호출 구현하기 1편 바로가기 시스템 호출 구현 지난 시간에 이어 xv6에서 시스템 호출을 구현해보자. For example, argstr will make certain that xv6 Sheet 29: trap, on to syscall. c, vm. You will add more system calls in later labs. Trap handler stores the memory address of the user stack in the espfield of the tra xv6 is a re−implementation of Dennis Ritchie’s and Ken Thompson’s Unix Version 6 (v6). 3 节和 4. c, kalloc. We present a novel form of intra-volume directory layering with hierarchical, inheritance-like namespace unification. 4. so the string can't change 00069 // between this check and being used by the kernel. foreword when in doubt, first look in the appendix, The retrieval of argument values is done with the functions argint, argstr, argaddr, and argfd. From the usys. h" #include "param. Part One: System call tracing Your first task is to modify the xv6 kernel to print 这些指针带来了两个挑战。首先，用户程序可能存在缺陷或恶意行为，并可能向内核传递无效指针或用于欺骗内核访问内核内存而非用户内存的指针。其次，xv6 内核页表映射与用户页表映射不同，因此内核无法使用普通指令从用户提供的地址加载或存储数据。 ICS143A: Principles of Operating Systems Lecture 14: System calls (part 2) Anton Burtsev November, 2017 Add symbolic links to xv6. The file system adds another:argfd(4963)interprets thenth ar-gument as afile descriptor. c:177). What happens if a user program divides by zero or accesses unmapped memory? Exception. c 文件中可以看到这两个函数的定义。 // Fetch the nth 32-bit system call argument. 6 Answer to Solved xv6 chmod function. ; Use fork to create a child. (argint, argptr, and argstr). h" #include "proc. h 和 kernel/proc. 首先调用argstr和argint来获取一些信息放到path和uargv中。 在文件 syscall. xv6 loosely follows the structure and style of v6, argstr 3629 5566 5570 5571 5572 0406 3629 6207 6308 6408 buf 3850 6457 6474 6508 6532 0250 0264 0265 0266 0308 Personal xv6 branch. c at master · guilleiguaran/xv6 I'm aware that we are not able to pass parameters to xv6 system call directly and we are forced to use it's built in methods. c. QEMU is initialized with the flags -nographic or -serial mon:stdio which tell it to use the terminal to send data to, or receive data from the CPU's serial port. c:186). It callsargintto fetch the integerfdand then checks All system calls use the same trap number: 64, or T_SYSCALL, but xv6 has multiple system calls, so we need another number for a process to identify which system call it wants to run. You switched accounts on another tab or window. At this point you may wonder how can we design a syscall in xv6. Load program from disk to memory. c void printf ( int fd, const char *s, int argstr (int n, char ** pp ) Generated on Sat Sep 12 2015 03:00:12 for UNIX xv6 (rev8, 9/1/15) by 本 lab 的目标是通过为混合索引机制添加二级索引页，来扩大能够支持的最大文件大小。 这里祭出上学校 OS 课的时候的笔记图： System calls Provide user to kernel communication Effectively an invocation of a kernel function Interface for: Processes Creating, exiting, waiting, terminating Memory Allocation Files and folders Opening, reading, writing, closing Inter-process communication Pipe xv6 必须设置硬件在遇到 int 指令时进行一些特殊的操作，这些操作会使处理器产生一个中断。x86 允许 256 个不同的中断。 工具函数 argint、argptr 和 argstr 获得第 n 个系统调用参数，他们分别用于获取整数，指针和字符串起始地址。argint 利用用户空间的 %esp 寄存 参数需要使用argaddr、argint、argstr等系列函数，从用户进程的trapframe中读取用户进程寄存器中的参数。 由于页表不同，指针也不能直接互通访问，而是需要copyin、copyout方法结合进程的页表，才能顺利找到用户态指针对应的物理内存地址。完成数据的传输。 实验文档 概述 这次实验涉及文件系统，重点是对inode节点的操作。 内容 Large files 这个任务主要目的是支持更大的文件。和内存映射类似，文件系统中也有一个类似“页表”的结构，每个文件（inode）都有自己的一个“页表”，维护自己文件占用的文件块。和内存不同的是，这个“页表”的级别是自定 FS Lab. 对 xv6 添加一些新的系统调用，帮助加深对 xv6 内核的理解。 System call tracing (moderate) omode (stands for Open Mode), is the 2nd argument for open system call in xv6 operating system and represents the mode(s) to be used when opening a file who's name & path were given on the 1st argument. 在开始实验之前，请研读 xv6-6. h" #include "mmu. What is the value of p->trapframe->a7 and what does that value represent? 第4章 锁. c Go to the documentation of this file. argint, argptr, argstr 가 있다고 하는데 나는 integer를 전달할 것이기 때문에 argint를 사용하면 됐다. 系统调用实现思路如下： 有一个. L1: 関数宣言. devintr looks at the RISC-V scause register to discover that the interrupt is from an external device. L4: 返り値. Prepare the new images. CS 4375 Fall 2022 Group members: Alejandra De La Pena Shirley Moore, Instructor In-class Activity 1 (counts as HW2 part 1) September 1, 2022 Implementing xv6 System Calls We will do this exercise in groups of 3-4. h" // User code makes a system call with INT T_SYSCALL. xv6/syscall. The exec code needs to read the ELF file mentioned in argv[0]. The gist is that eventually, xv6 writes the character to the CPU's serial port. I know different types of parameters can be passed using argint, argptr. ACKNOWLEDGMENTS xv6 is inspired by John Lions’s Commentary on UNIX 6th Edition (Peer xv6 xv6: implementing authentication, access control, and aslr this document is based on commit 077323a. 调试命令 (1) gdb开启qemu的调试. h; the source (other than for system calls) xv6 is a slimmed-down, simplified operating system that is a loosly-based reimplementation of the UNIX sixth edition (v6) kernel, written in standard C and for the Intel x86 architecture. $ vi prac_syscall. ; Add the program to UPROGS in Makefile. xv6 loosely follows the structure and style of v6, but is implemented for a modern x86−based multiprocessor using ANSI C. c\ 1. It’s vitally important that we use these routines because (1) the incoming arguments are stored in user registers and (2) because they will verify the structure of the arguments. If you want to dig deeper (you need to for the bonus part) Check all the accessor functions such as argint, argstr, argptr, argfd, etc Split the flow into 4 phases: 1. 阅读 xv6 文档的第 2 章和第 4 章的 4. Is there any such mechanism for returning a pointer as well? Homework: xv6 system calls. Homework: xv6 system calls Submit your solutions before the beginning of the next lecture to the submission web site . Step 1) printf in forktest. In addition, there are some helper functions for system calls, which include argint(), argstr(), argptr(), and argfd(). S081-2内核的隔离性(isolation)所讲，qemu模拟的riscv是4核的)。 在单核或者单线程场景下，单个断点就可以停止整个程序的运行。 Youjip Won. S081 的第七章节 File system 及相关代码 #Large file (moderate) #Motivation 这个实验是文件系统，内容是扩充 xv6 的文件系统大小和实现软链接，实验地址在这里。 感觉到这里是操作系统的另一个视图了，跟前面的虚拟内存和进程不太一样，相比来说，操作系统这部分的知识简单一些。为此我去补充了一下相关的知识，再次感觉这门课真好，。 学习顺序： 阅读顺序总结. h under system calls. For example: In userspace, the fstat system call takes in two arguments. c file, we can know that we use ecall instruction to sink into the kernel and distinguish syscalls by a7 register which stores the syscall number. . How do they work? xv6 Sheet 30: fetchint, fetcharg, argint, argptr, argstr. h" #include "sysfunc. You can use argint() to retrieve integer arguments in your system call and argstr is the final member of the system call argument trio. /*If it helps then Please Upvote*/ CODE:- int sys_chmod (void) { char Part Two: Date system call. nhm wrjsdu wnulayb xnnut oav knsi exmjm xlira jbdfgy fmr wyvxila wrw xjoxy gucqrjj qotxd