如果跳转或选中的分支(taken branch)的目标(target)上发生了指令访问错误异常(access-fault exception)或指令页错误异常(instruction page-fault exception),则该异常将在目标指令上报告,而不是跳转或分支指令上。 无条件跳转 JAL(jump and link)指令采用J-type格式,其中J-immediate编码了一个有符号偏移量(imm[20:10...
对于R=0 且 W=1的情况不符合实际含义,故作为保留,以便未来某些情况下使用。 当一条指令试图execute, load, store但遭到拒绝时,分别触发instruction access-fault exception, load access-fault exception, store access-fault exception。 Address Matching 之前说明了,一个PMP entry由一个地址寄存器和一个配置寄存器组...
01Instruction access fault 02Illegal instruction 03Breakpoint 04Load address misaligned 05Load access ...
Sstvalastvalmustbewrittenwiththefaultingvirtualaddressforload,store,andinstructionpage-fault,access-fault,andmisalignedexceptions,andforbreakpointexceptionsotherthanthosecausedbyexecutionoftheEBREAKorC.EBREAKinstructions.Forillegal-instructionexceptions,stvalmustbewrittenwiththefaultinginstruction. SscounterenwForanyhpm...
配置寄存器包含权限位，如R、W、X，分别表示读、写、执行权限，为1表示有权限，为0表示无权限。R=0且W=1的情况是预留的，以供未来使用。当指令尝试执行、加载或存储时遭到拒绝，会触发相应的异常：instruction access-fault exception、load access-fault exception、store access-fault exception。一个...
Failed read or write accesses generate a load or store access exception, and an instruction access fault would occur on a failed instruction fetch. When an exception occurs while attempting to execute from a region without execute permissions, the fault occurs on the fetch and not the branch, ...
1 指令访问错误(Instruction access fault) 同步 取指令访存错误。 mdcause提供详细的指令放错误类型: 2 非法指令(Illegal instruction) 同步 非法指令。 3 断点(Breakpoint) 同步 RISC-V架构定义了EBREAK指令,当处理器执行到该指令时,会发生异常进入异常服务程序。该指令往往用于调试器(Debugger)使用,譬如设置断点 ...
修改之后发现会在栈上 trap_instruction_access_fault: core 0: 0x0000000080002264 (0x000900e7) jalr s2 core 0: exception trap_instruction_access_fault, epc 0x000000007ffffbd8 core 0: tval 0x000000007ffffbd8 ... pc: 0x7ffffbdc $0: 0x00000000 ra: 0x80002268 sp: 0x7ffffb20 gp: 0x00000000...
The term "access fault" has a very specific meaning within RISC-V, which does not apply here. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Assignees No one assigned Labels None yet Projects None yet Milestone No milestone Developm...
基于RISC-V架构的双核容错系统.pdf,本发明公开了一种基于RISC‑V架构的双核容错系统,包括:第一处理器核、第二处理器核、指令紧耦合存储器、数据紧耦合存储器、多个总线矩阵模块、中断控制器、外部设备和总线,以及多个错误检查和纠正模块;第一处理器核和第二处理器核均