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3.30 __attribute__((section("name"))) variable attribute

The section attribute specifies that a variable must be placed in a particular data section.

Normally, the ARM® compiler places the data it generates in sections like .data and .bss. However, you might require additional data sections or you might want a variable to appear in a special section, for example, to map to special hardware.

If you use the section attribute, read-only variables are placed in RO data sections, writable variables are placed in RW data sections.

If the section name starts with .bss., the variable is placed in a ZI section.


/* in RO section */
const int descriptor[3] __attribute__((section ("descr"))) = { 1,2,3 };
/* in RW section */
long long rw_initialized[10] __attribute__((section ("INITIALIZED_RW"))) = {5};
/* in RW section */
long long rw[10] __attribute__((section ("RW")));
/* in ZI section */
int my_zi __attribute__((section (".bss.my_zi_section")));