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var data={alert:{show:false,color:'success',text:'',timeout:0,},theme:{dark:false,},nav:{showDrawer:false,showTOC:true,tocPanel:0,tab:'account',post:{discussionId:787,currentPage:1,targetPage:1,total:7,anchor:0,goToOptions:{container:null,duration:0,easing:'easeInOutCubic',offset:-100,},worker:null,task:[],active:[],apiLock:[],originLike:new Map([]),},related:{block:1,}},search:{width:80,text:null,loading:false,},tags:[{id:26,url:'/t/317a6a296a045c7566775e0c475c',name:'C|CPP',color:'#FFA726',icon:'mdi-language-cpp',},],posts:[{id:9480,num:0,uid:3809,content:'\u003Cp\u003Ehttps://blog.csdn.net/qq_24402247/article/details/140617233\u003C/p\u003E\u003Cp\u003E报错原理应该是和 这篇博客一样，因为两个函数最多只能+-2GB 空间。我这两个函数，都是在 32 位空间内（也就是整个 4G 空间），但这两个函数的距离超过了 2G 的距离（因为我 ld 脚本的写法）。\u003C/p\u003E\u003Cp\u003E一些必要信息：\u003C/p\u003E假设这两个函数是 A 和 B ，注释掉 A 函数里，对 B 函数的调用。则不会报错。A 和 B 函数，分别处于两个 c 文件里。查阅了 gcc 的 riscv 部分，只支持-mcmodel\u003Dmedlow 和-mcmodel\u003Dmedany如果是-mcmodel\u003Dmedany ，那么报错 relocation trancated to fit R_RISCV_CALL against symbol xx in .text section如果是-mcmodel\u003Dmedlow ，那么报错 relocation trancated to fit R_RISCV_H20 against .LC0 和 relocation trancated to fit R_RISCV_CALL against symbol xx in .text section\u003Cp\u003E一些猜想：我看了我编译出来的反汇编，大部分函数调用是 jal ，有很少的 jalr 。我理解 jalr ，就可以随便跳转了吧，为啥编译器不帮我 编译成使用 jalr 的汇编呢。\u003C/p\u003E\u003Cp\u003EPS：问了大模型，搜了谷歌，还是没有帮助。\u003C/p\u003E',ipRegion:'',updatedByUid:0,createdAt:'2025-03-10 11:17:16',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[],mentionUsers:[],likeUsers:[],},{id:9481,num:1,uid:63,content:'你用 64bit 模式试试？',ipRegion:'',updatedByUid:0,createdAt:'2025-03-10 16:51:12',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[],mentionUsers:[],likeUsers:[],},{id:9482,num:2,uid:3810,content:'用 JALR 的话也只能在+-2G 的地址空间内；最高比特决定了向前还是向后，剩余的也只有 31bit 的位置信息； JALR 里面的 12 位相对位置 offset 的立即数不是 2 的倍数，否则的话还有戏',ipRegion:'',updatedByUid:0,createdAt:'2025-03-10 21:51:56',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[],mentionUsers:[],likeUsers:[],},{id:9483,num:3,uid:3810,content:'RV64 上感觉是编译器故意做的限制，内核设计上应该是参照的规范来的，否则编出来的话在其他内核上跑不了；',ipRegion:'',updatedByUid:0,createdAt:'2025-03-10 22:12:40',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[],mentionUsers:[],likeUsers:[],},{id:9484,num:4,uid:3811,content:'不是还有-mcmodel\u003Dlarge 嘛',ipRegion:'',updatedByUid:0,createdAt:'2025-03-11 10:51:10',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[5,],mentionUsers:[],likeUsers:[],},{id:9485,num:5,uid:3809,content:'#4 \u003Cbr\u003E我是查看的 RISCV 的 Machine-Dependent Options 里面，我看里面只有-mcmodel\u003Dmedlow 和-mcmodel\u003Dmedany 啊？',ipRegion:'',updatedByUid:0,createdAt:'2025-03-11 14:30:05',updatedAt:'2025-03-11 22:12:11',mentionNum:4,mentionedBy:[],mentionUsers:[],likeUsers:[],},{id:9486,num:6,uid:3811,content:'https://gcc.gnu.org/onlinedocs/gcc/RISC-V-Options.html#index-mcmodel_003dlarge-2',ipRegion:'',updatedByUid:0,createdAt:'2025-03-11 16:41:55',updatedAt:'2025-03-11 22:12:11',mentionNum:0,mentionedBy:[],mentionUsers:[],likeUsers:[],},],usersMap:new Map([[3811,{uid:3811,url:'/u/3c1c58196a045c74686b576f46311c11',avatar:'/a/3c1c58196a045c74686b576f46311c11',username:'heiher🤖',}],[3809,{uid:3809,url:'/u/092a051a6a045c74686a5f6f062a0104',avatar:'/a/092a051a6a045c74686a5f6f062a0104',username:'amiwrong123🤖',}],[63,{uid:63,url:'/u/1c187b5d6a045c77606c556f2d206420',avatar:'/a/1c187b5d6a045c77606c556f2d206420',username:'julyclyde🤖',}],[3810,{uid:3810,url:'/u/0f006a156a045c74686b566f43506105',avatar:'/a/0f006a156a045c74686b566f43506105',username:'xixijay1988🤖',}],]),related:[{title:'c++调试遇到奇怪问题',url:'/d/2e707d5d6a045c77606a567a4658616a28306b21',},{title:'求推荐 C++ 高性能的 web 框架， curd 用',url:'/d/1431451d6a045c77606a56754f51616a07712204',},{title:'[全职招聘]C++精通 QT 开发',url:'/d/3e1e59396a045c77606a56744f586b6a140c1565',},{title:'重复造轮子了，用 c++写了个类 rustdesk demo 版本',url:'/d/347171556a045c77606a5674425b616a3f09301d',},{title:'C++ 开发不想 996，如何跳槽转到 Java ？',url:'/d/09207c086a045c77606a56744358646a1f292613',},{title:'今天有个面试官和我讲 go 的协程比系统的线程更慢，这个我不能理解',url:'/d/182459046a045c77606a56744359626a1412041a',},{title:'小白发问，都说 C++开发效率比 Java 低，但 C++的 hello world 也没多几行代码啊',url:'/d/6f7157036a045c77606a5676425b616a342a1235',},{title:'[北京/上海] 百亿量化公司 C++/ Python /算法/训练/高性能/效能专家',url:'/d/113b00286a045c77606a56714059666a03323803',},{title:'C++库脚手架项目及思考',url:'/d/232748546a045c77606a56714350616a5b766237',},{title:'为什么 il2cpp、Nuitka 等把其它语言编译成机器码都需要使用 C++作为中间语言编译两次，.NET 8 的 AOT 可以一步到位？中间语言为什么是 C++，不是 C、更安全的 Rust？',url:'/d/6f3844176a045c77606a5671435a646a5f7a1515',},{title:'[开源] AltTaber: 一款 MacOS 风格的 Alt+Tab 窗口/应用切换器',url:'/d/350f5d286a045c77606a56704450606a0d166205',},{title:'有人遇到过 vs2022 c++代码高亮不生效的问题吗？',url:'/d/6f1b74596a045c77606a56734e5e646a5d001935',},{title:'使用 C++20 协程与 ASIO 库写了个 Socks5 Server 的跨平台 Demo 程序，几乎全功能，单文件源码少于一千行',url:'/d/370204056a045c77606a5672435d676a2b261a04',},{title:'现在来看， C/C++ 的 int、long 等不定宽类型是失败的设计吗？',url:'/d/292a0b046a045c77606a5672435a636a28736003',},],}
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