Overview

gen_program_header is part of the riscv_asm_program_gen.sv assembly generation flow used in CHIPS Alliance's open-source riscv-dv random instruction generator for RISC-V processor verification. The surrounding riscv_asm_program_gen class generates complete RISC-V assembly programs, including sections such as initialization routines, instruction sections, data sections, stack sections, page tables, and interrupt/exception handling. [C1]

Role in the generation flow

gen_program() is described as the main function that generates all sections of the assembly program and calls functions in riscv_asm_program_gen one by one. In that flow, gen_program() calls gen_program_header() after directed-instruction stream setup. [C2]

gen_program_header() uses the string array instr_stream to fill in header content. The evidence gives an example header output:

.include "user_init.s"

[C3]

Section insertion

gen_program_header() calls:

gen_section("_start", str)

This call inserts header instructions into instr_stream. [C4]

Surrounding sequence

Within the documented gen_program() sequence, the header generation step occurs before init_gpr(), which initializes general-purpose registers with random values. Later steps generate directed instruction streams, convert instruction streams to assembly string format, optionally insert subprograms, and add host-interface related instructions. [C5]

Practical significance

Within the evidence-provided flow, gen_program_header() is the step responsible for establishing the generated assembly program's header content and _start section before register initialization and instruction-stream generation proceed. [C2][C3][C4][C5]