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zasm: lower RAM requirements

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I've tested RAM usage when self-assembling and there weren't as high
as I thought. zasm's defaults now use less than 0x1800 bytes of RAM,
making it possible, theoretically for now, for a Sega Master System
to assemble Collapse OS from within itself.
This commit is contained in:
Virgil Dupras 2019-10-06 15:42:09 -04:00
parent e4732d79dc
commit 83b314c450
2 changed files with 9 additions and 3 deletions
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12
apps/zasm/glue.asm
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@ -47,19 +47,25 @@
.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 0x40
.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 0x1000
.equ ZASM_REG_BUFSZ 0x700
; Size of the names buffer for the local context registry
.equ ZASM_LREG_BUFSZ 0x200
.equ ZASM_LREG_BUFSZ 0x100
; ******

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tools/emul/zasm/zasm.bin
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