A reference assembler for RISC-V backend. Primarily for learning and hacking. Implements the grammar described in the riscv-asm-manual. ELF spec reference is here.
Make sure flex and bison are present in your system.
make
The test files are under tests. Once the build is made,
use one of the assembly files from there to generate an
object file.
./riscvass tests/helloworld.s
This will result in an object file called out.o. you
can open it with a hex viewer like xxd out.o to see
the content.
This portion is for scratch notes as I am working through a feature or a component
- encode unconditional jump properly
- make sure the immediates are encoded properly: e.g. imm[31:12] means encode the bits 12 to 31.
aka the work in progress
- initialize symbol table and string table
- add entry to the strtab
- proper offset calculation for section headers
- add entry to the symtab
- add instructions to the text section
- Implement macro/psuedo instructions
- address/ref resolution (single pass?)
- local label (1b, 2f, etc.)
- Implement all ISA instructions
- relocation info
- Use the symbol table to the full capacity
- directive support