TMS570LS3137: How should byte alignment be set for the.data,.stack segments?

shunyun.deng

Part Number: TMS570LS3137

We are debugging another problem in which we want to align the data segment and stack of the program to 8 bytes.

The "ARM Optimizing C/C++ Compiler V16.9.0.lts User's Guide-SpNU151m "is checked. ALIGN() and PALIGN() are both acceptable.However, the compiled.data was not 8-byte aligned and the.map was not even refreshed.

Code Composer Studio Version: 10.0.0.00010

Please help to see how it is, thank you!

over 3 years ago

0 Chester Gillon over 3 years ago

Guru 92251 points

Reading the compiler documentation, ALIGN() or PALIGN() in a linker command file only control the alignment of the output section. I.e. doesn't control the alignment on the input sections which are combined to form the output section.

The old thread Aligning input sections with linker says controlling the input section alignment isn't possible in the linker command file.

Are you able to use the DATA_ALIGN pragma in the source code to specify the alignment on the individual symbols which need 8 byte alignment?

+1 QJ Wang over 3 years ago in reply to Chester Gillon

TI__Guru**** 196306 points

Hi Shunyun,

Please read the note in the link below to understand the input section and the output section:

http://software-dl.ti.com/ccs/esd/documents/sdto_cgt_Linker-Command-File-Primer.html

The only way to control the alignment of an input section is with the DATA_ALIGN pragma:

#pragma DATA_ALIGN(myData, 8)

char myData[64];

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TMS570LS3137: How should byte alignment be set for the.data,.stack segments?