Sam Ravnborg wrote:
Technically we should also specify @progbits or @nobits on sections,
however, I think @progbits is the default.
I have on my todo list to do so. But I wanted to investigate a bit
more since I do not yet fully understand the difference.
And we have to use %progbits and %nobits as ARM uses '"' to indicate
comments.
The difference is quite simple:
a - this section occupies address space
w - this section is writable
x - this section is executable
progbits - this section has data in the file
In contrast, a nobits section is implicitly zero-filled.
By default:
.bss is (aw,nobits).
.data is (aw,progbits).
.rodata is (a,progbits).
.text is (ax,progbits).
Since .bss is nobits, it doesn't occupy any space in the executable, and
is zero-filled by the loader.
-hpa
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