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The targets allow to run cc65 programs in the sim65 exection einvironment. As there are no "real" i/o facilities there's no need for header files. Paravirtualized entry points are mapped to $FFF0 ff. There's a large cc65 progam area from $0200-$FFEF. The binary format includes a one-byte header indicating the required execution environment: The value 0 means 6502 and the value 1 means 65C02. The load adress for the binary is fixed to $0200. Note: Running sim65C02 programs currently doesn't work bcause sim65 doesn't actually implement 65C02 opcodes.
33 lines
877 B
ArmAsm
33 lines
877 B
ArmAsm
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; Oliver Schmidt, 2013-05-16
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;
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; Startup code for cc65 (sim6502 version)
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;
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.export _exit
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.import zerobss, callmain
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.import initlib, donelib
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.import exit
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.import __RAM_START__, __RAM_SIZE__ ; Linker generated
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.import __STACKSIZE__ ; Linker generated
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.include "zeropage.inc"
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.segment "STARTUP"
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cld
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ldx #$FF
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txs
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lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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ldx #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
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sta sp
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stx sp+1
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jsr zerobss
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jsr initlib
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jsr callmain
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_exit: pha
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jsr donelib
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pla
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jsr exit
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