volatile char y; volatile char g; __attribute__((section(SECTION_NAME))) void foo(char x) { switch (x) { case 0: y = 67; break; case 1: y = 20; break; case 2: y = 109; break; case 3: y = 33; break; case 4: y = 44; break; case 5: y = 37; break; case 6: y = 10; break; case 7: y = 98; break; } y = y + g; }