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本文记录一次使用反汇编进行调试分析。
最近在 rtthread 下适配 MilkV Duo 的硬件定时器驱动时遇到了一些问题#xff0c;demo 运行时报以下错误#xff1a;
Unhandled Exception 2:Illegal Instruction
scause:0x0x0000000000000002,stval:0x0x…RISC-V反汇编调试记录分享
本文记录一次使用反汇编进行调试分析。
最近在 rtthread 下适配 MilkV Duo 的硬件定时器驱动时遇到了一些问题demo 运行时报以下错误
Unhandled Exception 2:Illegal Instruction
scause:0x0x0000000000000002,stval:0x0x000000000007a787,sepc:0x0x0000000080232a72
--------------Dump Registers-----------------
Function Registers: ra(x1) 0x0x0000000080232f88 user_sp 0x0x000000008029f5d8 gp(x3) 0x0x0000000080262a68 tp(x4) 0x0x00000000deadbeef
Temporary Registers: t0(x5) 0x0x0000000000000120 t1(x6) 0x0x00000000deadbeef t2(x7) 0x0x000000008029f518 t3(x28) 0x0x00000000deadbeef t4(x29) 0x0x00000000deadbeef t5(x30) 0x0x00000000deadbeef t6(x31) 0x0x00000000deadbeef
Saved Registers: s0/fp(x8) 0x0x000000008029f618 s1(x9) 0x0x00000000deadbeef s2(x18) 0x0x00000000deadbeef s3(x19) 0x0x00000000deadbeefs4(x20) 0x0x00000000deadbeef s5(x21) 0x0x00000000deadbeefs6(x22) 0x0x00000000deadbeef s7(x23) 0x0x00000000deadbeefs8(x24) 0x0x00000000deadbeef s9(x25) 0x0x00000000deadbeefs10(x26) 0x0x00000000deadbeef s11(x27) 0x0x00000000deadbeef
Function Arguments Registers: a0(x10) 0x0x00000000802604c0 a1(x11) 0x0x000000008029f6b0a2(x12) 0x0x000000008029f6b0 a3(x13) 0x0x0000000000000008 a4(x14) 0x0x0000000000000004 a5(x15) 0x0x0000000080256080 a6(x16) 0x0x0000000000000065 a7(x17) 0x0x00000000deadbeef
sstatus 0x0x0000000200040120 Supervisor Interrupt Disabled Last Time Supervisor Interrupt EnabledLast Privilege is Supervisor ModePermit to Access User PageNot Permit to Read Executable-only Page
satp 0x0x0000000000000000Current Page Table(Physical) 0x0x0000000000000000Current ASID 0x0x0000000000000000Mode No Address Translation/Protection Mode
-----------------Dump OK---------------------
--------------Thread list--------------
current thread: tshell
--------------Backtrace--------------想要查看 0x80232a72 处的程序指令确认是否有非法指令。由于身边没有合适的调试器不方便通过GDB对出错地址的代码进行定位。于是尝试通过反汇编进行分析
$ objdump -l -S rtthread.elf out.c运行提示不支持当前架构于是安装对应架构的反汇编工具
$ sudo apt install binutils-riscv64-unknown-elf安装完成后即可进行反汇编
$ riscv64-unknown-elf-objdump -l -S rtthread.elf out.c在反汇编得到的 out.c 中即可快速搜索定位到目标程序
/home/Project/rt-thread/components/drivers/hwtimer/hwtimer.c:43float tv_sec;float devi_min 1;80232a6e: 00023797 auipc a5,0x2380232a72: 61a78793 addi a5,a5,1562 # 80256088 rt_system_timer_thread_init0x6a6e80232a76: 0007a787 flw fa5,0(a5)80232a7a: fef42027 fsw fa5,-32(s0)即可继续进行分析调试。
