请问ARM9下浮点运算的问题。

实验板:     TQ2440
实验环境: Ubuntu12.04 + arm-linux-gcc-3.4.5-glibc-2.3.6
在代码中使用到浮点数运算，单个源文件编译可以通过，链接时出现一串很长的错误提示，根据错误提示到网上搜索了下，大概是因为硬件不支持浮点运算的问题。
但是，都没有讲清楚具体是怎么回事，怎么解决。请各位指点一下呐。
我试过把浮点运算的地方全部改成整型运算，编译，链接都没问题。
另外还想请教下，TFTLCD实验中的那个画线的算法，不太看得明白 ，请各位给点提示吧。
具体错误信息如下：

1. arm-linux-gcc -Wall -O2 -c -o output/Head.o source/Head.s
   
2. arm-linux-gcc -Wall -O2 -c -o output/Init.o source/Init.c
   
3. arm-linux-gcc -Wall -O2 -c -o output/MMU.o source/MMU.c
   
4. arm-linux-gcc -Wall -O2 -c -o output/Nand_K9F2G08U0B.o source/Nand_K9F2G08U0B.c
   
5. arm-linux-gcc -Wall -O2 -c -o output/Interrupt.o source/Interrupt.c
   
6. arm-linux-gcc -Wall -O2 -c -o output/Test.o source/Test.c
   
7. arm-linux-gcc -Wall -O2 -c -o output/TFTLCD.o source/TFTLCD.c
   
8. arm-linux-ld -TTest.lds -o output/Test.elf output/Head.o output/Init.o output/MMU.o output/Nand_K9F2G08U0B.o output/Interrupt.o output/Test.o output/TFTLCD.o
   
9. output/TFTLCD.o(.text+0xd0): In function `TFTDrawLine':
   
10. : undefined reference to `__floatsisf'
    
11. output/TFTLCD.o(.text+0xe4): In function `TFTDrawLine':
    
12. : undefined reference to `__floatsisf'
    
13. output/TFTLCD.o(.text+0xf0): In function `TFTDrawLine':
    
14. : undefined reference to `__divsf3'
    
15. output/TFTLCD.o(.text+0x10c): In function `TFTDrawLine':
    
16. : undefined reference to `__addsf3'
    
17. output/TFTLCD.o(.text+0x110): In function `TFTDrawLine':
    
18. : undefined reference to `__fixunssfsi'
    
19. output/TFTLCD.o(.text+0x12c): In function `TFTDrawLine':
    
20. : undefined reference to `__floatsisf'
    
21. output/TFTLCD.o(.text+0x134): In function `TFTDrawLine':
    
22. : undefined reference to `__addsf3'
    
23. output/TFTLCD.o(.text+0x13c): In function `TFTDrawLine':
    
24. : undefined reference to `__addsf3'
    
25. output/TFTLCD.o(.text+0x150): In function `TFTDrawLine':
    
26. : undefined reference to `__floatsisf'
    
27. output/TFTLCD.o(.text+0x15c): In function `TFTDrawLine':
    
28. : undefined reference to `__subsf3'
    
29. output/TFTLCD.o(.text+0x204): In function `TFTDrawLine':
    
30. : undefined reference to `__floatsisf'
    
31. output/TFTLCD.o(.text+0x218): In function `TFTDrawLine':
    
32. : undefined reference to `__floatsisf'
    
33. output/TFTLCD.o(.text+0x224): In function `TFTDrawLine':
    
34. : undefined reference to `__divsf3'
    
35. output/TFTLCD.o(.text+0x244): In function `TFTDrawLine':
    
36. : undefined reference to `__addsf3'
    
37. output/TFTLCD.o(.text+0x248): In function `TFTDrawLine':
    
38. : undefined reference to `__fixunssfsi'
    
39. output/TFTLCD.o(.text+0x264): In function `TFTDrawLine':
    
40. : undefined reference to `__floatsisf'
    
41. output/TFTLCD.o(.text+0x26c): In function `TFTDrawLine':
    
42. : undefined reference to `__addsf3'
    
43. output/TFTLCD.o(.text+0x274): In function `TFTDrawLine':
    
44. : undefined reference to `__addsf3'
    
45. output/TFTLCD.o(.text+0x288): In function `TFTDrawLine':
    
46. : undefined reference to `__floatsisf'
    
47. output/TFTLCD.o(.text+0x294): In function `TFTDrawLine':
    
48. : undefined reference to `__subsf3'
    
49. output/TFTLCD.o(.text+0x35c): In function `TFTDrawLine':
    
50. : undefined reference to `__floatsisf'
    
51. output/TFTLCD.o(.text+0x364): In function `TFTDrawLine':
    
52. : undefined reference to `__addsf3'
    
53. output/TFTLCD.o(.text+0x374): In function `TFTDrawLine':
    
54. : undefined reference to `__floatsisf'
    
55. output/TFTLCD.o(.text+0x37c): In function `TFTDrawLine':
    
56. : undefined reference to `__addsf3'
    
57. output/TFTLCD.o(.text+0x38c): In function `TFTDrawLine':
    
58. : undefined reference to `__floatsisf'
    
59. output/TFTLCD.o(.text+0x394): In function `TFTDrawLine':
    
60. : undefined reference to `__addsf3'
    
61. output/TFTLCD.o(.text+0x3a4): In function `TFTDrawLine':
    
62. : undefined reference to `__floatsisf'
    
63. output/TFTLCD.o(.text+0x3ac): In function `TFTDrawLine':
    
64. : undefined reference to `__addsf3'
    
65. output/TFTLCD.o(.text+0x3bc): In function `TFTDrawLine':
    
66. : undefined reference to `__floatsisf'
    
67. output/TFTLCD.o(.text+0x3c4): In function `TFTDrawLine':
    
68. : undefined reference to `__addsf3'
    
69. output/TFTLCD.o(.text+0x3d4): In function `TFTDrawLine':
    
70. : undefined reference to `__floatsisf'
    
71. output/TFTLCD.o(.text+0x3dc): In function `TFTDrawLine':
    
72. : undefined reference to `__addsf3'
    
73. output/TFTLCD.o(.text+0x3ec): In function `TFTDrawLine':
    
74. : undefined reference to `__floatsisf'
    
75. output/TFTLCD.o(.text+0x3f4): In function `TFTDrawLine':
    
76. : undefined reference to `__addsf3'
    
77. output/TFTLCD.o(.text+0x404): In function `TFTDrawLine':
    
78. : undefined reference to `__floatsisf'
    
79. output/TFTLCD.o(.text+0x40c): In function `TFTDrawLine':
    
80. : undefined reference to `__addsf3'
    
81. make: *** [Test.bin] Error 1

复制代码

2440不支持硬件浮点运算

可以看看bresenham算法

TQ-lkp 发表于 2012-7-20 14:51
2440不支持硬件浮点运算

恩，在网上看过一些解决办法，是在MakeFile中添加一些东西，我对MF还不熟悉，看不懂那些语句是做什么用的。
应该不至于要自己写浮点数运算函数吧？
以前学过AVR单片机，也没有硬件浮点运算电路，但是通过MakeFile中的设置，就可以让编译器自动生成浮点运算代码。

cbncb 发表于 2012-7-20 15:34
可以看看bresenham算法

谢谢，没学过信号处理、图像处理之类的课程，呵呵。