D1S跑rtt为什不定时的报错啊,谁帮忙分析一下

[smiletiger]

Unhandled Exception 2:Illegal Instruction
mcause:0x0000000000000002,mtval:0x0000000030009073,mepc:0x00000000401685d4
--------------Dump Registers-----------------
Function Registers:
ra(x1) = 0x00000000402ead80()
)
gp(x3) = 0x0000000000000000()
tp(x4) = 0x0000000000000000()
Temporary Registers:
t0(x5) = 0x0000000000000000()
t1(x6) = 0x0000000000000000()
t2(x7) = 0x0000000000000000()
t3(x28) = 0x00000000402eac50()
t4(x29) = 0x00000000402eac50()
t5(x30) = 0x00000000402eac60()
t6(x31) = 0x00000000402eac60()
Saved Registers:
s0/fp(x8) = 0x0000000000000000()
s1(x9) = 0x0000000000000000()
s2(x18) = 0x00000000402eabf8()
s3(x19) = 0x0000000000ff0001()
s4(x20) = 0x0000000000000000()
s5(x21) = 0x0000000000000000()
s6(x22) = 0x00000000402eac20()
s7(x23) = 0x00000000402eac20()
s8(x24) = 0x00000000402eac30()
s9(x25) = 0x00000000402eac30()
s10(x26) = 0x00000000402eac40()
s11(x27) = 0x00000000402eac40()
Function Argu
[2022-03-25 20:08:13.327]# RECV ASCII>
ments Registers:
a0(x10) = 0x0000000000000000()
a1(x11) = 0x00000000402f6ec8()
a2(x12) = 0x0000000070616568()
a3(x13) = 0x0000000000000000()
a4(x14) = 0x0000018300000000()
a5(x15) = 0x00000000402a8380()
a6(x16) = 0x00000000402e62e8()
a7(x17) = 0x00000000402eabf8()
sstatus = 0x0000000a00000000
Supervisor Interrupt Disabled
Last Time Supervisor Interrupt Disabled
Last Privilege is User Mode
Not Permit to Access User Page
Not Permit to Read Executable-only Page
satp = 0x0000000000000000
Mode = No Address Translation/Protection Mode
-----------------Dump OK---------------------

定位到代码是下面这条语句

401685c2: 3002b073 csrc mstatus,t0
401685c6: 6291 lui t0,0x4
401685c8: 3002a073 csrs mstatus,t0
401685cc: 6082 ld ra,0(sp)
401685ce: 34109073 csrw mepc,ra
401685d2: 60c2 ld ra,16(sp)
401685d4: 30009073 csrw mstatus,ra

定位到源代码是这里的
.macro SAVE_ALL

#ifdef ENABLE_FPU
/* save float registers /
addi sp, sp, -CTX_FPU_REG_NR * REGBYTES
#endif / ENABLE_FPU */

/* save general registers */
addi  sp,   sp, -CTX_GENERAL_REG_NR * REGBYTES //save 33 reg
STORE x1,   1 * REGBYTES(sp)                //x1 ra

csrr  x1, mstatus
STORE x1,   2 * REGBYTES(sp)

csrr  x1, mepc
STORE x1, 0 * REGBYTES(sp)