a816 1.0.1

65c816 patching assembler (Super Famicom)

a816

Another 65c816 assembler

Usage

Command line

$ a816 --help
usage: x816 [-h] [--verbose] [-o OUTPUT_FILE] [-f FORMAT] [-m MAPPING] [--copier-header] [--dump-symbols] [-D KEY=VALUE [KEY=VALUE ...]] input_file

x816 usage

positional arguments:
  input_file            The asm file to assemble.

options:
  -h, --help            show this help message and exit
  --verbose             Displays all log levels.
  -o OUTPUT_FILE, --output OUTPUT_FILE
                        Output file
  -f FORMAT             Output format
  -m MAPPING            Address Mapping
  --copier-header       Adds 0x200 address delta corresponding to copier header in ips writer.
  --dump-symbols        Dumps symbol table
  -D KEY=VALUE [KEY=VALUE ...], --defines KEY=VALUE [KEY=VALUE ...]
                        Defines symbols.

or directly from python code:

From python code

from a816.program import Program

def build_patch(input, output):
    program = Program()
    program.assemble_as_patch(input, output)
    program.resolver.dump_symbol_map()

Supported Syntax

Memonics

adc, and, asl, bcc, bcs, beq, bit, bmi, bne, bpl, bra, brk, brl, bvc, bvs, clc, cld, cli, clv, cmp, cop, cpx, cpy, db, dec, dex, dey, eor, inc, inx, iny, jml, jmp, jsl, jsr, lda, ldx, ldy, lsr, mvn, mvp, nop, ora, pea, pei, per, pha, phb, phd, phk, php, phx, phy, pla, plb, pld, plp, plx, ply, rep, rol, ror, rti, rtl, rts, sbc, sec, sed, sei, sep, sta, stp, stx, sty, stz, tax, tay, tcd, tcs, tdc, trb, tsb, tsc, tsx, txa, txs, txy, tya, tyx, wai, xba, xce

Macros

; define a macro
.macro test(var_1, var_2) {
    lda.w var_1 << 16 + var_2
}

; use that macro
test(0x10, 0x10)

; should expand that way
lda.w 0x10 << 16 + 0x10

; code generated
lda.w 0x1010

Code pointer relocation

*=0x008000
    jsr.l _intro

Scopes

some_address = 0x54
{
    lda.b some_address
    beq no_action
    ; this label is only visible inside this scope
    no_action:
}

Named scopes

*=0x009000
named_scope {
   addr = 0x1234
   youhou_text:
   .text 'youhou'
   .db 0
   yaha_text:
   .text 'yaha'
   .db 0
}

*=0x019A52
	load_system_menu_text_pointer(named_scope.youhou_text)

*=0x019A80
	load_system_menu_text_pointer(named_scope.yaha_text)