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riscemu/docs/assembly.md

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Assembly

Assembly tokenization should be workiung completely. It knows what instructions the CPU implementation supports and parses based on them.

Pseudo-ops

The following pseudo-ops are implemented as of yet:

  • .space <len> reverse bytes of zero
  • .ascii 'text' put text into memory
  • .asciiz 'text' put text into memory (null terminated)
  • .sextion .<name> same as .<name> see sections:

Sections:

Currently only these three sections are supported:

  • data read-write data (non-executable)
  • rodata read-only data (non-executable)
  • .text executable data (read-only)

Allocating stack

another pseudo-op is recognized: .stack <len>. This marks the executable as requesting at least <len> bytes of stack. If the loader repsects this wish, the sp is initialized pointing to the end of the stack.