mirror of
https://github.com/fachat/xa65.git
synced 2024-06-26 08:29:29 +00:00
110 lines
3.4 KiB
Plaintext
110 lines
3.4 KiB
Plaintext
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mkdir xatest
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cd xatest
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echo "jsr bla: loop: jmp loop" > 1.s
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echo "bla: rts" > 2.s
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xa -R -c -o 1.o65 1.s
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xa -R -c -o 2.o65 2.s
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ldo65 -o linked.o65 1.o65 2.o65
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reloc65 -bt 32768 -xt -o t linked.o65
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hexdump -C t
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output:
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00000000 20 06 80 4c 03 8c 60 | ..L..`|
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00000007
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The bytes 20 06 80 are correct, it's JSR $8006. But 4c 03 8c means JMP $8c03. What's wrong here?
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Do I use it in a wrong way?
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Following procedure leads to the expected code:
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echo "jsr bla: loop: jmp loop: bla: rts" > 1.s
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xa -R -c -o 1.o65 1.s
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ldo65 -o linked.o65 1.o65
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reloc65 -bt 32768 -xt -o t linked.o65
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hexdump -C t
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I use 2.3.0, it comes with Debian Testing.
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==============================================================================
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Analysis:
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cat 1.o65.hex
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00000000 01 00 6f 36 35 00 00 10 00 10 06 00 00 04 00 00 |..o65...........|
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00000010 00 40 00 00 04 00 00 00 00 00 00 20 00 00 4c 03 |.@......... ..L.|
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00000020 10 01 00 62 6c 61 00 02 80 00 00 03 82 00 00 01 |...bla..........|
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00000030 00 6c 6f 6f 70 00 02 03 10 |.loop....|
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00000039
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file65 -V 1.o65
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1.o65: o65 version 0 object file
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mode: 1000 =[object][16bit][byte relocation][CPU 6502][align 1]
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text segment @ $1000 - $1006 [$0006 bytes]
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data segment @ $0400 - $0400 [$0000 bytes]
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bss segment @ $4000 - $4000 [$0000 bytes]
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zero segment @ $0004 - $0004 [$0000 bytes]
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stack size $0000 bytes (i.e. unknown)
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Undefined Labels: 1
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bla
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Global Labels: 1
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loop (segID=2 (text), offset=1003)
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==> text segment start $1000, loop is at $1003 -> ok
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undef'd label bla stored as zero (00 00) in opcode -> ok
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relocation table entry: $1001, ADR, undef'd, label #0 -> ok
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$1004, ADR, text segment -> ok
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---------------------------------------------------
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cat 2.o65.hex
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00000000 01 00 6f 36 35 00 00 10 00 10 01 00 00 04 00 00 |..o65...........|
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00000010 00 40 00 00 04 00 00 00 00 00 00 60 00 00 00 00 |.@.........`....|
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00000020 01 00 62 6c 61 00 02 00 10 |..bla....|
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file65 -V 2.o65
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2.o65: o65 version 0 object file
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mode: 1000 =[object][16bit][byte relocation][CPU 6502][align 1]
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text segment @ $1000 - $1001 [$0001 bytes]
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data segment @ $0400 - $0400 [$0000 bytes]
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bss segment @ $4000 - $4000 [$0000 bytes]
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zero segment @ $0004 - $0004 [$0000 bytes]
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stack size $0000 bytes (i.e. unknown)
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Undefined Labels: 0
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Global Labels: 1
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bla (segID=2 (text), offset=1000)
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=> text segment start $1000 -> ok
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no relocation table entries -> ok
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global label text segment, at $1000 -> ok
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---------------------------------------------------
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ldo65 -o linked.o65 1.o65 2.o65
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linked.o65.hex
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00000000 01 00 6f 36 35 00 00 00 00 04 07 00 00 10 00 00 |..o65...........|
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00000010 00 40 00 00 02 00 00 00 00 00 00 20 06 04 4c 03 |.@......... ..L.|
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00000020 10 60 00 00 02 82 03 82 00 00 02 00 6c 6f 6f 70 |.`..........loop|
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00000030 00 02 03 04 62 6c 61 00 02 06 04 |....bla....|
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ile65 -V linked.o65
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linked.o65: o65 version 0 executable file
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mode: 0000 =[executable][16bit][byte relocation][CPU 6502][align 1]
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text segment @ $0400 - $0407 [$0007 bytes]
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data segment @ $1000 - $1000 [$0000 bytes]
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bss segment @ $4000 - $4000 [$0000 bytes]
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zero segment @ $0002 - $0002 [$0000 bytes]
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stack size $0000 bytes (i.e. unknown)
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Undefined Labels: 0
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Global Labels: 2
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loop (segID=2 (text), offset=0403)
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bla (segID=2 (text), offset=0406)
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=> text segment start $0400
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$0400 jsr $0406 -> RTS -> ok
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$0403 jmp $1003 >>>>>>>>>>>>>>>> wrong !!!
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should be $0403
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