; zasm
;
; Reads input from specified blkdev ID, assemble the binary in two passes and
; spit the result in another specified blkdev ID.
;
; We don't buffer the whole source in memory, so we need our input blkdev to
; support Seek so we can read the file a second time. So, for input, we need
; GetB and Seek.
;
; For output, we only need PutB. Output doesn't start until the second pass.
;
; The goal of the second pass is to assign values to all symbols so that we
; can have forward references (instructions referencing a label that happens
; later).
;
; Labels and constants are both treated the same way, that is, they can be
; forward-referenced in instructions. ".equ" directives, however, are evaluated
; during the first pass so forward references are not allowed.
;
; *** Requirements ***
; strncmp
; upcase
; findchar
; blkSel
; blkSet
; fsFindFN
; fsOpen
; fsGetB
; _blkGetB
; _blkPutB
; _blkSeek
; _blkTell
; printstr
; printcrlf
inc "user.h"
; *** Overridable consts ***
; NOTE: These limits below are designed to be *just* enough for zasm to assemble
; itself. Considering that this app is Collapse OS' biggest app, it's safe to
; assume that it will be enough for many many use cases. If you need to compile
; apps with lots of big symbols, you'll need to adjust these.
; With these default settings, zasm runs with less than 0x1800 bytes of RAM!
; Maximum number of symbols we can have in the global and consts registry
equ ZASM_REG_MAXCNT 0xff
; Maximum number of symbols we can have in the local registry
equ ZASM_LREG_MAXCNT 0x20
; Size of the symbol name buffer size. This is a pool. There is no maximum name
; length for a single symbol, just a maximum size for the whole pool.
; Global labels and consts have the same buf size
equ ZASM_REG_BUFSZ 0x700
; Size of the names buffer for the local context registry
equ ZASM_LREG_BUFSZ 0x100
