ARM_UNWIND_BACKTRACE (2)

修改点：

1. 所有vrs[7]都要改成vrs[11]，

2. unwind_frame()

/* We are done if current frame pc is equal to the virtual pc, prevent infinite loop */
   if(pc == ucb.vrs[15]) {
       return 0;
   }

如果C代码函数有递归调用，可能不会push pc，所以pop时pc是没有改变的，递归虽然调用的是同一个函数，但不能只认为只有一次调用，

（这里同时也是3.）

3. unwind_frame()

  /* Set the virtual pc to the virtual lr if this is the first unwind */if(ucb.vrs[15] == 0) {ucb.vrs[15] = ucb.vrs[14];}

init初始化时，

/* Initialize the virtual register set */if(frame) {ucb->vrs[11] = frame->fp;ucb->vrs[13] = frame->sp;ucb->vrs[14] = frame->lr;ucb->vrs[15] = frame->pc;}这里当时没注意，原出处是ucb->vrs[15] = 0;

但同样的是递归时不更新PC同样是会提前结束。

修改为每次都设置pc = lr

代码做应用时发现的问题，做修改后，暂时OK了

## Total Size      = 0x0000a158 = 41304 Bytes
## Start Addr      = 0x40000000
## Starting application at 0x40000000 ...
GIC version: 2
********************************
FuKe OS [Dec 12 2020 17:42:35]
------------------------------
OS MEM: (0x4000F000) 0x4000F000 - 0x42000000, size 0x01FF1000
        (DDR 0x40000000 - 0x42000000, 0x02000000)
IDLE Task Id 0
=== APP run err 1

RootFs: VFS, UID 1
/
|--- dev/(mount DevFS, UID 2)
        |---    |---
EXCEPT: Data Abort
----- Unwind BackTrace -----
R0: 0x6559244E, R1: 0x44388BF9, R2: 0x3FEAD06D, R3: 0x31727D4E, R4: 0x00000006
R5: 0x4000A0D0, R6: 0x168A05AD, R7: 0x13E199CE R8: 0x00000001, R9: 0xDEADBEEF
R10: 0x00000001, R11: 0x4000F8A4 R12: 0x4000F665
SP: 0x4000F880, LR: 0x00000005, PC: 0x40002420, CPSR: 0x60000013
0x400023D4(print_node) @0x40002420

R0: 0x6559244E, R1: 0x44388BF9, R2: 0x3FEAD06D, R3: 0x31727D4E, R4: 0x4000F920
R5: 0x4000F8D0, R6: 0x4000F8D4, R7: 0x4000A028 R8: 0x00000000, R9: 0xDEADBEEF
R10: 0x00000001, R11: 0x4000F8CC R12: 0x4000F665
SP: 0x4000F8A8, LR: 0x4000249C, PC: 0x4000249C, CPSR: 0x60000013
0x400023D4(print_node) @0x4000249C

R0: 0x6559244E, R1: 0x44388BF9, R2: 0x3FEAD06D, R3: 0x31727D4E, R4: 0x00000000
R5: 0x4000DA40, R6: 0xDEADBEEF, R7: 0xDEADBEEF R8: 0xDEADBEEF, R9: 0xDEADBEEF
R10: 0xDEADBEEF, R11: 0x4000F8EC R12: 0x4000F665
SP: 0x4000F8D0, LR: 0x400026D0, PC: 0x400026D0, CPSR: 0x60000013
0x40002658(test_fs_tree) @0x400026D0

R0: 0x6559244E, R1: 0x44388BF9, R2: 0x3FEAD06D, R3: 0x31727D4E, R4: 0x4000A008
R5: 0xDEADBEEF, R6: 0xDEADBEEF, R7: 0xDEADBEEF R8: 0xDEADBEEF, R9: 0xDEADBEEF
R10: 0xDEADBEEF, R11: 0x4000F904 R12: 0x4000F665
SP: 0x4000F8F0, LR: 0x40002278, PC: 0x40002278, CPSR: 0x60000013
0x40002208(osIdleTask) @0x40002278

----- Unwind BackTrace End -----
@ FK_ExceptHandle() L652: ERROR TO HANG !!!

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