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6.2.4 Annotating assembly code programs

Valgrind can annotate assembly code programs too, or annotate the assembly code generated for your C program. Sometimes this is useful for understanding what is really happening when an interesting line of C code is translated into multiple instructions.

To do this, you just need to assemble your ‘.s’ files with assembler-level debug information. gcc doesn't do this, but you can use the GNU assembler with the ‘--gstabs’ option to generate object files with this information, e.g.:

as --gstabs foo.s

You can then profile and annotate source files in the same way as for C/C++ programs.