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57 lines
1.4 KiB
ArmAsm
57 lines
1.4 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 06.08.1998
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; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
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;
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; CC65 runtime: function epilogue
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;
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; exit a function. pop stack and rts. The function comes in different
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; flavours that provide default values for the return val, or drop a local
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; stack frame with size in y.
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.export leave00, leave0, leavey00, leavey0, leavey
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.export leave
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.import addysp
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.importzp sp
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.macpack cpu
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leave00:
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lda #0
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leave0: ldx #0
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beq leave
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leavey00:
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lda #0 ; "return 0"
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leavey0:
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ldx #0 ; return < 256
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leavey:
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jsr addysp ; drop stack frame
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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leave: tay ; save A a sec
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lda (sp) ; that's the pushed arg size
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sec ; Count the byte, the count's stored in
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adc sp
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sta sp
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bcc L1
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inc sp+1
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L1: tya ; Get return value back
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.else
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leave: pha ; save A a sec
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ldy #0
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lda (sp),y ; that's the pushed arg size
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sec ; Count the byte, the count's stored in
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adc sp
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sta sp
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bcc L1
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inc sp+1
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L1: pla ; Get return value back
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.endif
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rts
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