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https://github.com/autc04/Retro68.git
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129 lines
2.1 KiB
ArmAsm
129 lines
2.1 KiB
ArmAsm
# Completely pointless test program to figure out how MacsBug function names work
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# The format for MacsBug function names:
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# if strlen(name) < 32:
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# rts | jmp (%a0) // return instruction [required]
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# .byte 0x80 + strlen(name)
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# .ascii name
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# .align 2,0
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# .short literalBytes
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# // literalBytes of data
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# else: // 32 <= strlen(name) <= 255
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# rts | jmp (%a0) // return instruction [required]
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# .byte 0x80
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# .byte strlen(name)
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# .ascii name
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# .align 2,0
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# .short literalBytes
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# // literalBytes of data
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.section .text.startup,"ax",@progbits
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.align 2
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.globl main
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.type main, @function
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main:
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link.w %fp,#0
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dc.w 0xa9ff
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moveq #0,%d0
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move.w #42, -(%sp)
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bsr foopas
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move.w #42, -(%sp)
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bsr foopas2
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move.w #42, -(%sp)
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bsr barpas
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bsr quux
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# Some weird control flow to see under what
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# circumstances MacsBug recognizes function names:
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bra .L1
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unlk %fp
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.L2:
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rts
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.L1:
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moveq #1,%d0
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unlk %fp
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bra .L2
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# MacsBug recognizes the function name only
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# after rts and a few other instructions,
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# so we just add a rts
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rts
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.byte 132
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.ascii "main"
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.align 2,0
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# size of literals following function name
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.short 0
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.size main, .-main
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foopas:
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link.w %fp,#42
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unlk %fp
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move.l (%sp)+, %a0
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addq #2, %sp
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# MacsBug knows about jmp (%a0)
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jmp (%a0)
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.byte 134
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.ascii "foopas"
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.align 2,0
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# size of literals following function name
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.short 0
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.size foopas, .-foopas
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foopas2:
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link.w %fp,#42
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unlk %fp
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move.l (%sp)+, %a1
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addq #2, %sp
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# MacsBug doesn't know about jmp (%a1)
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jmp (%a1)
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.byte 135
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.ascii "foopas2"
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.align 2,0
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# size of literals following function name
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.short 0
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.size foopas2, .-foopas2
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barpas:
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link.w %fp,#42
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unlk %fp
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move.l (%sp)+, %a1
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addq #2, %sp
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jmp (%a1)
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# ... but adding an extra rts doesn't hurt.
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rts
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.byte 134
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.ascii "barpas"
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.align 2,0
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# size of literals following function name
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.short 0
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.size barpas, .-barpas
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quux:
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link.w %fp,#42
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unlk %fp
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rts
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rts
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.byte 152
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# MacsBug doesn't recognize names with weird characters
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.ascii "quux<X>::operator()(int)"
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.align 2,0
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# size of literals following function name
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.short 0
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.size quux, .-quux
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