RealView Compilation Tools - ARM Information Center

Compiler-specific Features
• rwdata
• zidata.
Usage
Use a scatter-loading description file with the ARM linker to control how to place a
named section at a particular address in memory.
Restrictions
This option has no effect on:
• Inline functions and their local static variables.
• Template instantiations and their local static variables.
• Elimination of unused variables and functions. However, using #pragma arm
section enables the linker to eliminate a function or variable that might otherwise
be kept because it is in the same section as a used function or variable.
• The order that definitions are written to the object file.
Example
int x1 = 5;
// in .data (default)
int y1[100];
// in .bss (default)
int const z1[3] = {1,2,3}; // in .constdata (default)
#pragma arm section rwdata = "foo", rodata = "bar"
int x2 = 5;
// in foo (data part of region)
int y2[100];
// in .bss
int const z2[3] = {1,2,3}; // in bar
char *s2 = "abc";
// s2 in foo, "abc" in .conststring
#pragma arm section rodata
int x3 = 5;
// in foo
int y3[100];
// in .bss
int const z3[3] = {1,2,3}; // in .constdata
char *s3 = "abc";
// s3 in foo, "abc" in .conststring
#pragma arm section code = "foo"
int add1(int x)
// in foo (code part of region)
{
return x+1;
}
#pragma arm section code
See also
• __attribute__((section("name"))) on page 4-38
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