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shrink evalstack from 2 to 1 page

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c64=$cf00-$cfff, x16: $0700-$07ff
This commit is contained in:
Irmen de Jong 2023-02-21 22:52:04 +01:00
parent fd5ebef488
commit 5318ba6c6e
7 changed files with 16 additions and 19 deletions
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6
codeCore/src/prog8/code/target/atari/AtariMachineDefinition.kt
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@ -13,9 +13,9 @@ class AtariMachineDefinition: IMachineDefinition {
override val FLOAT_MEM_SIZE = 6
override val PROGRAM_LOAD_ADDRESS = 0x2000u
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x1a00u // $1a00-$1aff inclusive // TODO
override var ESTACK_HI = 0x1b00u // $1b00-$1bff inclusive // TODO
// the 2*128 byte evaluation stack (1 page, on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x1b00u // $1b00-$1b7f inclusive // TODO
override var ESTACK_HI = 0x1b80u // $1b80-$1bff inclusive // TODO
override lateinit var zeropage: Zeropage
override lateinit var golden: GoldenRam

6
codeCore/src/prog8/code/target/c128/C128MachineDefinition.kt
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@ -14,9 +14,9 @@ class C128MachineDefinition: IMachineDefinition {
override val FLOAT_MEM_SIZE = Mflpt5.FLOAT_MEM_SIZE
override val PROGRAM_LOAD_ADDRESS = 0x1c01u
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x1a00u // $1a00-$1aff inclusive
override var ESTACK_HI = 0x1b00u // $1b00-$1bff inclusive
// the 2*128 byte evaluation stack (1 page, on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x1b00u // $1b00-$1b7f inclusive
override var ESTACK_HI = 0x1b80u // $1b80-$1bff inclusive
override lateinit var zeropage: Zeropage
override lateinit var golden: GoldenRam

6
codeCore/src/prog8/code/target/c64/C64MachineDefinition.kt
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@ -15,9 +15,9 @@ class C64MachineDefinition: IMachineDefinition {
override val FLOAT_MEM_SIZE = Mflpt5.FLOAT_MEM_SIZE
override val PROGRAM_LOAD_ADDRESS = 0x0801u
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0xce00u // $ce00-$ceff inclusive
override var ESTACK_HI = 0xcf00u // $ce00-$ceff inclusive
// the 2*128 byte evaluation stack (1 page, on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0xcf00u // $cf00-$cf7f inclusive
override var ESTACK_HI = 0xcf80u // $cf80-$cfff inclusive
override lateinit var zeropage: Zeropage
override lateinit var golden: GoldenRam

6
codeCore/src/prog8/code/target/cx16/CX16MachineDefinition.kt
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@ -14,9 +14,9 @@ class CX16MachineDefinition: IMachineDefinition {
override val FLOAT_MEM_SIZE = Mflpt5.FLOAT_MEM_SIZE
override val PROGRAM_LOAD_ADDRESS = 0x0801u
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x0400u // $0400-$04ff inclusive
override var ESTACK_HI = 0x0500u // $0500-$05ff inclusive
// the 2*128 byte evaluation stack (1 page, on which bytes, words, and even floats are stored during calculations)
override var ESTACK_LO = 0x0700u // $0700-$077f inclusive
override var ESTACK_HI = 0x0780u // $0780-$07ff inclusive
override lateinit var zeropage: Zeropage
override lateinit var golden: GoldenRam

2
codeGenCpu6502/src/prog8/codegen/cpu6502/ProgramAndVarsGen.kt
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@ -435,7 +435,7 @@ internal class ProgramAndVarsGen(
}
asmgen.out("""+
ldx #255 ; init estack ptr
ldx #127 ; init estack ptr (half page)
clv
clc""")
}

6
docs/source/technical.rst
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@ -38,9 +38,9 @@ directly into the target variable, register, or memory location.
The software stack is implemented as follows:
- 2 pages of memory are allocated for this, exact locations vary per machine target.
For the C64 they are set at $ce00 and $cf00 (so $ce00-$cfff is reserved).
For the Commander X16 they are set at $0400 and $0500 (so $0400-$05ff are reserved).
- 2*128 bytes = 1 page of memory allocated for this, exact locations vary per machine target.
For the C64 this page is at $cf00-$cfff.
For the Commander X16 it is at $0700-$07ff (top of the "golden ram" area).
This default location can be overridden using the `-esa` command line option.
- these are the high and low bytes of the values on the stack (it's a 'split 16 bit word stack')
- for byte values just the lsb page is used, for word values both pages

3
docs/source/todo.rst
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@ -5,9 +5,6 @@ For next minor release
^^^^^^^^^^^^^^^^^^^^^^
- option to put BSS in specific upper memory block ($a000-$bfff on x16, $c000-$cdff on C64) add a .cerror check for overflow!
- document bss stuff in the manual
- shrink the evalstack to just 1 page (half page for upper, half page for lower byte)
- after that, move evalstack on x16 to $0700-$07ff rather than $0400-$04ff ? -> gotta fix x16shell 'bios' vectors
...