SECTION .data contain nothing？

thomas yang78259

Recently I read detaily COFF file format and bin file format， as you know COFF file use section for relocation, and the .text section for code, .data for init value, .......

while I compiler a file and see the map file, I find that the size of the .data section is 0, which means the section is empty. I did not understand that because my program uses several global vars which all have different init value(not 0) and I think the init value will be put into .data section, did I misunderstand?

my program just like this:

int gtest0, gtest1, gtest2, gtest3;

int gtest4 = 0x55;

char gchar[4] = {0x30, 0x31, 0x32, 0x33};

short gShort[5];

void main() { ...... }

over 12 years ago

0 Tom Kopriva over 12 years ago

TI__Mastermind 20480 points

Thomas,

What device are you using?

You might want to take a look at the compiler user's guide. For example, the C6000 User's guide has a section (7.1.1.) defining where initialized global variables go.

0 thomas yang78259 over 12 years ago in reply to Tom Kopriva

Intellectual 950 points

thanks Tom Kopriva

I have read the guide and find that there is not real .data section and replace with .fardata section and .neardata section and .rodata section. and

-- For EABI only, the .fardata section reserves space for non-const, initialized far global and static variables.

– For EABI only, the .neardata section reserves space for non-const, initialized near global and static variables.

– For EABI only, the .rodata section reserves space for const near global and static variables.

but I want to know above section just reserve space or hold some init value? and what is EABI? what is ABI? Does

CCS can support EABI?How to define far or near?

0 David Friedland over 12 years ago in reply to thomas yang78259

TI__Mastermind 18320 points

Thomas,

Your question appears t be more specific to the code gen tools than to BIOS. I have moved this thread over to the Compiler Forum in hopes that it will get a faster response there.

0 Archaeologist over 12 years ago in reply to thomas yang78259

TI__Guru* 84285 points

thomas yang78259 said:
what is EABI? what is ABI?

For a definition of ABI, see http://en.wikipedia.org/wiki/Application_binary_interface

See the TMS320C6000 Optimizing Compiler v7.4 User's Guide (SPRU187U) section 6.11 "Application Binary Interface"

Does CCS can support EABI?

Yes

I want to know above section just reserve space or hold some init value?

You are either using COFF or you are using EABI, you cannot use both. COFF mode and EABI mode use the section names a bit differently. In COFF mode, the compiler does not generate any .data sections. See section 5.3.5 "Specifying Where to Allocate Sections in Memory"

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SECTION .data contain nothing？