CL65在使用.align时不调整地址

Question

我正在尝试编写一个使用.align指令来确保数据不跨越页面边界的asm程序。

但是，虽然数据位于内存中正确的位置，但编译后的代码没有使用正确的地址。

根据文档( https://www.cc65.org/doc/ld65-5.html )

如果请求对齐，链接器将向输出文件添加足够的空间，以便新段从一个地址开始，该地址可以被给定的数字除除而没有剩余部分。所有地址都进行了相应的调整。用于填充未使用的空间，使用零字节，或者，如果内存区域具有“填充”属性，则使用该值。

这种调整似乎并没有发生。

要再现，我有以下配置文件：(请注意DATA256段上的“对齐”)

# Assembly configuration for R38

FEATURES {
    STARTADDRESS: default = $0801;
}
SYMBOLS {
    __LOADADDR__: type = import;
# Putting "-u __EXEHDR__" on cl65's command line will add a BASIC RUN stub to your program.
#    __EXEHDR__:   type = import;
    __HIMEM__:    type = weak, value = $9F00;
}
MEMORY {
    ZP:       file = "", start = $0022,  size = $0080 - $0022, define = yes;
    ZP2:      file = "", start = $00A9,  size = $0100 - $00A9;
    LOADADDR: file = %O, start = %S - 2, size = $0002;
    MAIN:     file = %O, start = %S,     size = __HIMEM__ - %S;
}
SEGMENTS {
    ZEROPAGE: load = ZP,       type = zp;
    EXTZP:    load = ZP2,      type = zp, optional = yes; # OK if BASIC functions not used
    LOADADDR: load = LOADADDR, type = ro;
    EXEHDR:   load = MAIN,     type = ro, optional = yes;
    CODE:     load = MAIN,     type = ro;
    LOWCODE:  load = MAIN,     type = ro, optional = yes;
    RODATA:   load = MAIN,     type = ro;
    DATA:     load = MAIN,     type = rw;
    DATA256:  load = MAIN,     type = rw, align = $100;
    DATA4k:   load = MAIN,     type = rw, align = $1000;
    BSS:      load = MAIN,     type = bss,                define = yes;
}
FEATURES {
    CONDES: type    = constructor,
            label   = __CONSTRUCTOR_TABLE__,
            count   = __CONSTRUCTOR_COUNT__,
            segment = ONCE;
    CONDES: type    = destructor,
            label   = __DESTRUCTOR_TABLE__,
            count   = __DESTRUCTOR_COUNT__,
            segment = RODATA;
    CONDES: type    = interruptor,
            label   = __INTERRUPTOR_TABLE__,
            count   = __INTERRUPTOR_COUNT__,
            segment = RODATA,
            import  = __CALLIRQ__;
}

以asm为

   .org $0801                  ; Assembled code should start at $0801
                                ; (where BASIC programs start)
                                ; The real program starts at $0810 = 2064

; 10 SYS 2064
    .byte $0C, $08              ; $080C - pointer to next line of BASIC code
    .byte $0A, $00              ; 2-byte line number ($000A = 10)
    .byte $9E                   ; SYS BASIC token
    .byte $20                   ; [space]
    .byte $32, $30, $36, $34    ; $32="2",$30="0",$36="6",$34="4"
    .byte $00                   ; End of Line
    .byte $00, $00              ; This is address $080C containing
                                ; 2-byte pointer to next line of BASIC code
                                ; ($0000 = end of program)
    .byte $00, $00              ; Padding so code starts at $0810
    cld

    stp
    lda testdata
    rts


.segment "DATA256"
testdata:
    .byte $01, $02, $03, $04

使用以下命令行生成：

cl65 --verbose -o build.prg --cpu 65c02 -t cx16 -C asm.cfg -Ln labels.txt -m map.txt -T main.asm

这是编译好的.prg。您可以看到从$0816读取的'lda测试数据‘，它不是对齐地址。填充到$01，$02，$03显示数据是对齐的。

​

​

这在调试器中得到确认。

​

​

我做错了什么？或者这是链接器中的一个bug？

Answer 1

不要使用.org指令。配置文件设置地址：STARTADDRESS: default = $0801。

另外，该指令告诉汇编程序告诉链接器，“不要重新定位下面的代码”。这就阻止了.segment指令执行我们期望它做的事情。