本文是对RISC-V ABIs Specification中整数和浮点的调用约定部分的详细介绍。 1 整数寄存器约定 RISCV中一共有32个整数寄存器。 1.1 特殊功能寄存器 x0 (zero):零寄存器,硬连线为0值,不可修改。用于提供常数0或清空操作。 x1 (ra):返回地址寄存器,存储函数调用的返回地址。 ...
ABI见“RISC-V ABIs Specification”,除了直接手写汇编的大神外(比如一些汇编级的适配工作),abi主要面向编译器后端开发和移植人员,ABI作为Application与AEE的接口,实际上主要用于支持编程语言各种基础语法和功能的实现(实际上就是支持作为编译器的编译目标),包括表达式求值(加减法... 整数/浮点等运算操作),各种循环跳转...
For more details, please seeThe RISC-V ISA Specification, Volume I: Unprivileged Spec march RISC-V ISA strings are defined by appending the supported extensions to the base ISA in the order listed above. For example, the RISC-V ISA with 32, 32-bit integer registers and the instructions to ...
The RV32E calling convention may only be used with the RV32E ISA, hence the role of registers x16-x31 and f0-f31 is not defined. A future version of this specification may relax this constraint. While various different ABIs are technically possible, for software compatibility reasons it is ...
--with-isa-spec=can specify the default version of the RISC-V Unprivileged (formerly User-Level) ISA specification. Possible options are:2.2,20190608and20191213. The default version is20191213. More details about this option you can refer this postRISC-V GNU toolchain bumping default ISA spec to...
This document is currently targeted at toolchain implementers and developers, but over time we hope it will also become a useful reference for RISC-V toolchain users. See also RISC-V user-level ISA specification RISC-V ELF psABI specification ...
--with-isa-spec=can specify the default version of the RISC-V Unprivileged (formerly User-Level) ISA specification. Possible options are:2.2,20190608and20191213. The default version is20191213. More details about this option you can refer this postRISC-V GNU toolchain bumping default ISA spec to...
https://github.com/riscv/riscv-qemu.git ABI Supported ABIsareilp32 (32-bit soft-float), ilp32d (32-bit hard-float), ilp32f (32-bitwithsingle-precisioninregistersanddoubleinmemory, niche useonly), lp64 lp64f lp64d (same butwith64-bit longandpointers). ...
For RISC-V, we separate out specification and checking of PMAs into a separate hardware structure, the PMA checker. In many cases, the attributes are known at system design time for each physical address region, and can be hardwired into the PMA checker. Where the attributes are run-time ...
When the full 5-bit destination register specifier is present, it is in the same place as in the 32-bit RISC-V encoding. Where immediates are sign-extended, the sign-extension is always from bit 12. Immediate fields have been scrambled, as in the base specification, to reduce the number...