WebApr 26, 2024 · la t0, __stack_end__ csrw CSR_MSCRATCH, t0. 1.把工程的桟底写入to寄存器. 2.然后通过csrw指令写入内核暂存寄存器CSR_MSCRATCH. LOAD sp, pxCurrentTCB LOAD sp, 0x0(sp) 1.把pxCurrentTCB赋予桟指正sp,而pxCurrentTCB就是任务,而任务结构体的第一项就是桟顶.这就对应起来了 http://csg.csail.mit.edu/6.175/labs/lab8-riscv-exceptions.html
Constructive Computer Architecture: RISC-V …
Webcsrr a1, mepc: mv a2, sp: jal handle_trap: csrw mepc, a0 # Remain in M-mode after eret: li t0, MSTATUS_MPP: csrs mstatus, t0: LREG x1, 1*REGBYTES(sp) LREG x2, 2*REGBYTES(sp) LREG x3, … WebExecute the mret instruction, after first setting up mstatus.mpp to S (01) and mepc to the address you want to start executing S mode from. To switch to U mode set mstatus.mpp … csharp spec
RISC-V port pxPortInitialiseStack() issue about "mstatus" value …
http://csg.csail.mit.edu/6.175/lectures/L09-RISC-V%20ISA.pdf WebThe RISC-V Instruction Set Manual Volume II: Privileged Architecture Version 1.7 Andrew Waterman Yunsup Lee Rimas Avizienis David A. Patterson Krste Asanović Volume 2 of the RISC-V ISAspecification, or “The PrivilegedSpec”, defines offered privilege levels. In simplest terms, RISC-V offers threelevels of privilege, or modes, which systems can choose to support indifferent configurations. The three basic modes include: 1. Machine (M) 2. Supervisor (S) 3. User (U) These … See more In our post on Caller and Callee SavedRegisters,we introduced 32 General Purpose Registers (GPRs) defined in the RISC-V ISA.These … See more In our Introduction to InstructionFormatspost we covered a few instructions offered by the RISC-V base ISAs, and touchedbriefly on how RISC-V uses an extension … See more As previously mentioned, our entry point is defined as start, which is ataddress 0x80000000 in memory. QEMU will jump there after some initial setup,and since we already set a breakpoint, we can issue a “continue” (c) … See more As previously mentioned, a hart starts out in Mmode. We can break out QEMU tosee this in action, but first we’ll need to write a program to step through. Inprevious posts we have written C … See more eafe growth etf