How to specify .bss section on a elf target?

Asked May 18 '15 at 15:00

Active May 18 '15 at 15:00

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I want to define a bss section for my elf. But when i google for it only below flags would be supported for ELF targets using .section directive.

a section is allocatable 
e section is excluded from executable and shared library. 
w section is writable 
x section is executable 
M section is mergeable 
S section contains zero terminated strings 
G section is a member of a section group 
T section is used for thread-local-storage 
? section is a member of the previously-current section's group, if any

Can anyone help me to specify bss section or else any alternative option.

asked May 18 '15 at 15:00

vimal prathap

3

The compiler and linker will automatically add a .bss section. Could you clarify what you actually want to do? (So where do you want to specify it, in a linker script, from the commandline, using which tool). – Sebastian Riese May 18 '15 at 15:04
not in linker script, i have it in .S file. – vimal prathap May 18 '15 at 15:06
does this answer your question? – Sebastian Riese May 18 '15 at 15:07
@sebastian no. I have like .section "sectionname", "ab" So i am getting a compilation error "Fatal error: unrecognized .section attribute: want a,e,w,x,M,S,G,T" because "b" isn't supported for elf. BTW i am using gcc compiler. – vimal prathap May 18 '15 at 15:11
Could you post a minimal example showing the problem? – Sebastian Riese May 18 '15 at 15:14
@SebastianRiese Please check my previous comment. – vimal prathap May 18 '15 at 15:16
Why do you need a named .bss section? Why don't you allocate space in the .bss section? – Sebastian Riese May 18 '15 at 15:18
No, i can't do that. – vimal prathap May 18 '15 at 15:19
You could also allocate memory in a named section and zero the section by hand. – Sebastian Riese May 18 '15 at 15:25

How to specify .bss section on a elf target?

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