How to add compiler generated sections for instrumentation binaries?

Table of Contents

• Introduction
  • Linker changes

Introduction

When all libraries and application is compiled in instrumentation mode, some extra ELF sections are created by the compiler. In any examples, these additional section handling needs to be done in linker script.

Linker changes

In the linker file, some change are required. Add following lines of code in linker file when using ti-arm-clang compiler. This code should be inside SECTIONS.

GROUP
{
    .bss:{} palign(8)
    __llvm_prf_cnts: {} align(8)
    __llvm_prf_bits: {} align(8)
} > OCRAM
RUN_START(__BSS_START)
RUN_END(__BSS_END)

Few things to keep tack of:

1. Sections .bss, __llvm_prf_cnts and __llvm_prf_bits should not be present anywhere else in the linker file.
2. OCRAM should be replaced with correct memory name.