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Place the zero page variables into the ZEROPAGE segment

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git-svn-id: svn://svn.cc65.org/cc65/trunk@322 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2000-09-07 21:49:13 +00:00
parent 5446245eb4
commit e0a619ff90
7 changed files with 148 additions and 103 deletions
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libsrc/apple2/crt0.s
+26 -18
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@@ -15,25 +15,33 @@
; Define and export the ZP variables for the C64 runtime
.exportzp sp, sreg, regsave
.exportzp ptr1, ptr2, ptr3, ptr4
.exportzp tmp1, tmp2, tmp3, tmp4
.exportzp regbank, zpspace
.exportzp ptr1, ptr2, ptr3, ptr4
.exportzp tmp1, tmp2, tmp3, tmp4
.exportzp regbank, zpspace
; These zero page entries overlap with the sweet-16 registers.
; must be changed if sweet-16 is to be supported
sp = $00 ; stack pointer
sreg = $02 ; secondary register/high 16 bit for longs
regsave = $04 ; slot to save/restore (E)AX into
ptr1 = $08 ;
ptr2 = $0A
ptr3 = $0C
ptr4 = $0E
tmp1 = $10
tmp2 = $11
tmp3 = $12
tmp4 = $13
regbank = $14 ; 6 byte register bank
zpspace = $1A ; Zero page space allocated
; These zero page entries overlap with the sweet-16 registers in
; the standard apple2 linker config. They must be changed if sweet-16
; is to be supported
.zeropage
zpstart = *
sp: .res 2 ; Stack pointer
sreg: .res 2 ; Secondary register/high 16 bit for longs
regsave: .res 2 ; slot to save/restore (E)AX into
ptr1: .res 2
ptr2: .res 2
ptr3: .res 2
ptr4: .res 2
tmp1: .res 1
tmp2: .res 1
tmp3: .res 1
tmp4: .res 1
regbank: .res 6 ; 6 byte register bank
zpspace = * - zpstart ; Zero page space allocated
.code
; ------------------------------------------------------------------------
; Actual code