|
- ; 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"
- .org 0x85e0
- .equ USER_RAMSTART USER_CODE
-
- ; *** 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
-
- ; ******
-
- .inc "err.h"
- .inc "ascii.h"
- .inc "blkdev.h"
- .inc "fs.h"
- jp zasmMain
-
- .inc "core.asm"
- .inc "zasm/const.asm"
- .inc "lib/util.asm"
- .inc "lib/ari.asm"
- .inc "lib/parse.asm"
- .inc "zasm/util.asm"
- .equ IO_RAMSTART USER_RAMSTART
- .inc "zasm/io.asm"
- .equ TOK_RAMSTART IO_RAMEND
- .inc "zasm/tok.asm"
- .equ INS_RAMSTART TOK_RAMEND
- .inc "zasm/instr.asm"
- .equ DIREC_RAMSTART INS_RAMEND
- .inc "zasm/directive.asm"
- .inc "zasm/parse.asm"
- .equ EXPR_PARSE parseNumberOrSymbol
- .inc "lib/expr.asm"
- .equ SYM_RAMSTART DIREC_RAMEND
- .inc "zasm/symbol.asm"
- .equ ZASM_RAMSTART SYM_RAMEND
- .inc "zasm/main.asm"
- USER_RAMSTART:
|
