There are no specific enable bits to allow exceptions to occur since they are always enabled by default. However, early in the boot flow, software should set up mtvec.BASE to a defined value, which contains the base address of the default exception handler. All exceptions will trap to mtve...
The Interrupt bit in the mcause register is set if the trap was caused by an interrupt. The Exception Code field contains a code identifying the last exception or interrupt. Table 3.6 lists the possible machine-level exception codes. The Exception Code is a WLRL field, so is only guaranteed...
RISC-V 执行环境接口(EEI, execution environment interface)定义了程序的初始状态、环境中hart的数量与类型(包括hart所支持的特权模式,可访问的内存、I/O区域,所有合法指令在每个hart上的执行行为(即,ISA实际是EEI的一个组件)),以及该如何处理在执行期间引发的任何中断(intrrupt)和异常(exception)(包括环境调用(envir...
在RISC-V中,synchronous exceptions和interrupts分别用于处理指令执行中的错误和外部/内部事件引发的中断。理解这两者的区别和处理方式有助于设计和实现更有效的异常和中断处理机制。 这句话描述了在RISC-V架构中,如何使用mcause寄存器的值来区分中断和其他陷阱(traps),以及如何利用该值来索引到陷阱向量表(trap vector t...
我们将术语异常(exception)认为是在运行时出现了一个与当前RISC-V线程中的一条指 令相关的非正常的情况。我们将术语自陷(trap)认为是在一个RISC-V线程中出现了一个异 常的情况,导致将控制同步传输到自陷处理函数。自陷处理函数通常是在一个更高特权环境 中执行的。 我们将术语中断(interrupt)认为是在当前RISC-...
A shift left can remove the interrupt bit and scale the exception codes to index into a trap vector table. We do not distinguish privileged instruction exceptions from illegal opcode exceptions. This simplifies the architecture and also hides details of which higher-privilege instructions are ...
RISC-V Instruction Set Manual. Contribute to riscv/riscv-isa-manual development by creating an account on GitHub.
RISC-V Instruction Set Manual. Contribute to riscv/riscv-isa-manual development by creating an account on GitHub.
左移两位得到vector_table的index的原因是:A shift left can remove the interrupt bit and scale the exception codes to index into a trap vector table. 跳转到处理程序: 使用jalr指令跳转到计算出的处理程序地址,保存返回地址到ra寄存器。 jalr ra, 0(a1) ...
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