WebApr 5, 2024 · CSRRW ：CSR Read and Write，用于读写CSR。 将CSR的前一个值复制到目标寄存器，源寄存器的值 (rs1)被复制到CSR，这是一个原子写操作。 要读取CSR而不写入它，源寄存器 (rs1)可以指定为x0。 要编写CSR而不读取它，目标寄存器 (rd)可以指定为x0。 这是一个原子操作。 简单来说就是rd是读CSR到rd中，rs1是将rs1的值写入到CSR。 例 … WebApr 11, 2024 · On 2024/4/11 17:02, Bin Meng wrote: When reading a non-existent CSR QEMU should raise illegal instruction exception, but currently it just exits due to the g_assert() check.
从riscv底层原理分析gd32vf103的中断行为 - 豆丁网
WebDec 17, 2015 · riscv-privileged is at 1.7, compressed is at 1.9 but does not contain csrrw. Have added link in question to the privileged 1.7 spec to help clarify the question if this is the wrong version can you edit the question to link to the correct documentation. – WebThe CSRRW (Atomic Read/Write CSR) instruction atomically swaps values: in the CSRs and integer registers. CSRRW reads the old value of the: CSR, zero-extends the value to XLEN bits, then writes it to integer: register {\em rd}. The initial value in {\em rs1} is … iowa men\u0027s basketball tonite
RISC-V Instruction Set Explanation - fraserinnovations
WebFrom: Daniel Henrique Barboza To: Bin Meng , Alistair Francis , Liu Zhiwei , Weiwei Li , Palmer Dabbelt Cc: [email protected], [email protected], Fei Wu … WebMay 5, 2024 · The main problem is you have to use a compile time constant for the 'csr' value, you can not use a register/variable to provide this. Which means you can not put it in a loop and get the CSR register number from a variable in C. The specific ASM instruction that is generated is encoded to include the CSR register number, the CSR to work with is ... WebCategory NameFmt RV32I Base Category Name RV mnemonic Loads Load Atomic R/WByte ILB rd,rs1,imm CSR Access CSRRW rd,csr,rs1 LoadHalfword ILH rd,rs1,imm Atomic Read & Set BitCSRRS rd,csr,rs1 Load Word ILW rd,rs1,imm Atomic Read & Clear BitCSRRC rd,csr,rs1 LoadByte Unsigned ILBU rd,rs1,imm Atomic R/W ImmCSRRWI … iowa men\u0027s basketball tournament