blackfin gcc-toolchain 链接错误未定义对“Ret_Add”的引用

Question

以下讨论：

https://blackfin.uclinux.org/gf/project/uclinux-dist/forum/?_forum_action=ForumMessageBrowse&thread_id=46813&action=ForumBrowse&forum_id=39

我正在将 VDSP 编译器的 FFT 算法转换为裸机应用程序以在核心 B 上运行并让 uclinux 在核心 A 上运行。我有一个链接错误，我不明白它来自哪里：

调用：'/opt/uClinux/bfin-elf/bin/../bfin-elf/bin/ld.real''-v''-o''test_ad1836_driver''-T''coreb_test_ad1836_driver.lds' '--just-symbol' '../../icc_core/icc' 'queue.o' 'ezkit_561.o' 'heap_2.o' 'port.o' 'tasks.o' 'test_ad1836_driver.o' 'list .o''croutine.o''u​​ser_isr.o''bfin_isr.o''app_c.o''context_sl_asm.o''cycle_count.o''CFFT_Rad4_NS_NBRev.o''-Ttext''0x3c00000''-L'' /opt/uClinux/bfin-elf/bfin-elf/lib''-L''/opt/uClinux/bfin-elf/bfin-elf/lib''-lc' GNU ld 版本 2.17 cycle_count.o：在函数Compute_Cycle_Count': /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBRev/corea/cycle_count.asm:22: undefined reference toRet_Add' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBrev/corea/cycle_count.asm:23：未定义引用Ret_Add' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBRev/corea/cycle_count.asm:27: undefined reference toSave_R7' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBrev/corea/cycle_count.asm:28：未定义引用Save_R7' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBRev/corea/cycle_count.asm:44: undefined reference toSave_R7' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBrev/corea/cycle_count.asm:45：未定义引用Save_R7' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBRev/corea/cycle_count.asm:48: undefined reference toRet_Add' /home/william/Development_new/Music_Recognition/code/uCLinux/uclinux-dist/user/blkfin-apps/icc_utils/example/DSP_imp/CFFT_Rad4_NS_NBrev/corea/cycle_count.asm:49：未定义对“Ret_Add”的引用

代码如下：

.section l1.data;
.align 4;
.var _Ret_Add =0;
.var _Save_R7 =0;

.section l1.text;
.global _Compute_Cycle_Count;
.align 8;
_Compute_Cycle_Count： P0.L = _Ret_Add;
P0.H = _Ret_Add;
R3 = RETS；
[P0] = R3；

    P0.L = _Save_R7;                                                       
    P0.H = _Save_R7;                                                       
    [P0] = R7; 

........

谢谢

威廉

Answer 1

您的代码中没有 _Ret_Add 和 _Save_R7 声明以供 GNU 汇编器理解。你应该把它从 VDSP asm 移植到 GNU asm：

_Ret_Add: .int 0;

或者如果您更喜欢保持向后兼容：

.if defined (__GNUC__)
_Ret_Add:
.int 0;
.else
.var _Ret_Add =0;
.endif

看看this。