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Most of register fiddling routines (which is now the only thing contained in care.asm) are used by almost all userspace apps, often in inner loops. That makes the penalty of using jump tables for those a bit too high. Moreover, it burdens jump tables needlessly. Because this unit is very small (now that string routines are out), it makes sense to always include it in binaries.
90 lines
2.4 KiB
NASM
90 lines
2.4 KiB
NASM
; zasm
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;
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; Reads input from specified blkdev ID, assemble the binary in two passes and
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; spit the result in another specified blkdev ID.
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;
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; We don't buffer the whole source in memory, so we need our input blkdev to
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; support Seek so we can read the file a second time. So, for input, we need
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; GetB and Seek.
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;
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; For output, we only need PutB. Output doesn't start until the second pass.
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;
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; The goal of the second pass is to assign values to all symbols so that we
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; can have forward references (instructions referencing a label that happens
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; later).
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;
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; Labels and constants are both treated the same way, that is, they can be
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; forward-referenced in instructions. ".equ" directives, however, are evaluated
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; during the first pass so forward references are not allowed.
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;
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; *** Requirements ***
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; strncmp
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; upcase
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; findchar
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; parseHex
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; parseHexPair
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; blkSel
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; blkSet
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; fsFindFN
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; fsOpen
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; fsGetB
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; parseArgs
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; _blkGetB
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; _blkPutB
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; _blkSeek
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; _blkTell
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; printstr
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; FS_HANDLE_SIZE
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; BLOCKDEV_SIZE
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.inc "user.h"
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; *** Overridable consts ***
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; NOTE: These limits below are designed to be *just* enough for zasm to assemble
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; itself. Considering that this app is Collapse OS' biggest app, it's safe to
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; assume that it will be enough for many many use cases. If you need to compile
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; apps with lots of big symbols, you'll need to adjust these.
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; With these default settings, zasm runs with less than 0x1800 bytes of RAM!
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; Maximum number of symbols we can have in the global and consts registry
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.equ ZASM_REG_MAXCNT 0xff
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; Maximum number of symbols we can have in the local registry
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.equ ZASM_LREG_MAXCNT 0x20
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; Size of the symbol name buffer size. This is a pool. There is no maximum name
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; length for a single symbol, just a maximum size for the whole pool.
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; Global labels and consts have the same buf size
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.equ ZASM_REG_BUFSZ 0x700
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; Size of the names buffer for the local context registry
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.equ ZASM_LREG_BUFSZ 0x100
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; ******
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.inc "err.h"
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.inc "ascii.h"
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.org USER_CODE
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jp zasmMain
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.inc "core.asm"
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.inc "zasm/const.asm"
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.inc "lib/util.asm"
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.inc "zasm/util.asm"
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.equ IO_RAMSTART USER_RAMSTART
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.inc "zasm/io.asm"
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.equ TOK_RAMSTART IO_RAMEND
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.inc "zasm/tok.asm"
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.inc "lib/parse.asm"
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.equ INS_RAMSTART TOK_RAMEND
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.inc "zasm/instr.asm"
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.equ DIREC_RAMSTART INS_RAMEND
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.inc "zasm/directive.asm"
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.inc "zasm/parse.asm"
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.inc "zasm/expr.asm"
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.equ SYM_RAMSTART DIREC_RAMEND
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.inc "zasm/symbol.asm"
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.equ ZASM_RAMSTART SYM_RAMEND
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.inc "zasm/main.asm"
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