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Change segment order to make o65 layout valid

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VECTORS was messing things up
This commit is contained in:
Byron Lathi
2023-08-22 20:49:07 -07:00
parent c5b1a47c8e
commit 8bccfed867
7 changed files with 55 additions and 28 deletions
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2
sw/kernel/boot.s
View File

@@ -17,7 +17,7 @@
; ---------------------------------------------------------------------------
; Place the startup code in a special segment
.segment "CODE"
.segment "STARTUP"
; ---------------------------------------------------------------------------
; A little light 6502 housekeeping

7
sw/kernel/link.ld
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@@ -11,13 +11,12 @@ MEMORY
SEGMENTS {
ZEROPAGE: load = ZP, type = zp, define = yes;
STARTUP: load = KERNEL, type = ro;
CODE: load = KERNEL, type = ro;
ONCE: load = KERNEL, type = ro, optional = yes;
CODE: load = KERNEL, type = ro;
RODATA: load = KERNEL, type = ro;
DATA: load = KERNEL, type = rw, define = yes;
BSS: load = KERNEL, type = rw, define = yes;
HEAP: load = KERNEL, type = rw, define = yes, optional = yes;
RODATA: load = KERNEL, type = ro;
VECTORS: load = ROM, type = ro, start = $FFFA;
}
FILES
@@ -27,7 +26,7 @@ FILES
FORMATS
{
o65: os = super, version = 0, type = small,
o65: os = lunix, version = 0, type = small,
export = _init;
}

16
sw/kernel/vectors.s
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@@ -1,16 +0,0 @@
.segment "VECTORS"
.addr _nmi_int ; NMI vector
.addr _na ; Reset vector (Doesn't matter, will go back to ROM)
.addr _irq_int ; IRQ/BRK vector
.segment "CODE"
_na:
rti
_nmi_int:
rti
_irq_int:
rti

48
sw/script/o65dump.py
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@@ -1,6 +1,43 @@
#!/usr/bin/python
import sys
import io
class O65():
header: dict[str, int] = {}
options: list[(int, int, bytes)] = []
text: bytes
data: bytes
def __init__(self, filename: str) -> None:
with open(filename, "rb") as _file:
self.header["no_c64"] = int.from_bytes(_file.read(2))
self.header["magic"] = int.from_bytes(_file.read(3))
self.header["version"] = int.from_bytes(_file.read(1))
self.header["mode"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["tbase"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["tlen"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["dbase"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["dlen"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["bbase"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["blen"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["zbase"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["zlen"] = int.from_bytes(_file.read(2), byteorder="little")
self.header["stack"] = int.from_bytes(_file.read(2), byteorder="little")
olen = int.from_bytes(_file.read(1))
while olen != 0:
otype = int.from_bytes(_file.read(1))
obytes = _file.read(olen - 2)
self.options.append((olen, otype, obytes))
olen = int.from_bytes(_file.read(1))
self.text = _file.read(self.header["tlen"])
self.data = _file.read(self.header["dlen"])
def main() -> None:
if len(sys.argv) < 2:
@@ -8,8 +45,15 @@ def main() -> None:
return
filename = sys.argv[1]
print(filename)
with open(filename, "rb") as file:
print(file.read(1))
o65 = O65(filename)
for item, value in o65.header.items():
print(f"{item}:\t{value:x}")
for option in o65.options:
print(f"Type: {option[1]}, Data: {option[2]}")
with open("text.bin", "wb") as textfile:
textfile.write(o65.text)
if __name__ == "__main__":
main()

2
sw/test_exec/Makefile
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@@ -1,4 +1,4 @@
CC=cl65
CC=../cc65/bin/cl65
CFLAGS=-T -t super6502 -I. --cpu "65C02"
test: CFLAGS=-T -t sim65c02 -I.
LDFLAGS=-C link.ld -m $(NAME).map

6
sw/test_exec/link.ld
View File

@@ -10,13 +10,13 @@ FILES {
SEGMENTS {
ZEROPAGE: load = ZP, type = zp, define = yes;
DATA: load = SDRAM, type = rw, define = yes, run = SDRAM;
BSS: load = SDRAM, type = bss, define = yes;
HEAP: load = SDRAM, type = bss, optional = yes;
STARTUP: load = SDRAM, type = ro;
ONCE: load = SDRAM, type = ro, optional = yes;
CODE: load = SDRAM, type = ro;
RODATA: load = SDRAM, type = ro;
DATA: load = SDRAM, type = rw, define = yes, run = SDRAM;
BSS: load = SDRAM, type = bss, define = yes;
HEAP: load = SDRAM, type = bss, optional = yes;
}
FEATURES {