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m1n1.adt: introduce yet another DAPFT8110 variant

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When I tried to use the proxyclient shell, I got:
"Exception parsing /device-tree/arm-io/dart-dcp.dapf-instance-0 value […]"

I laid out the hex dump in a text editor, and added line breaks every
56 bytes (the former size of DAPFT8110B):

0000703b020000000080713b0200000020000000000000000000000000000000000000000000000000000000000000000003010000000000
40723b020000000080723b020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000
003b020000007f73073b02000000200000000000000000000000000000000000000000000000000000000000000000030100000000000028
3d020000000040283d020000002000000000000000000000000000000000000000000000000000000000000000000301000000000080003d
020000000380003d020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000e03f02
000000ffffef3f0200000020000000000000000000000000000000000000000000000000000000000000000003010000000000c0403e0200
0000ffff403e020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000433e020000
00ff3f433e020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000783d02000000
03417a3d0200000020000000000000000000000000000000000000000000000000000000000000000003010000000000003c3b0200000000
003e3b020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000403c02000000ffff
473c020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000103c020000004f0c10
3c020000002000000000000000000000000000000000000000000000000000000000000000000301000000000000703d020000000341723d
02000000200000000000000000000000000000000000000000000000000000000000000000030100000000

Looking at the patterns shared by all struct instances
(r0h = 3, r0l = 1, for example), each row appeared to be shifted one
byte to the left compared to its predecessor.  This suggests that
DAPFT8110B has only three extra bytes of padding compared to
DAPFT8110.

So, here I introduce DAPFT8110C, a new variant, one byte shorter than
DAPFT8110B.  Unlike DAPFT8110, there's no flag to differentiate
between these two variants, so we just have to guess based on what
divisor makes whole structs.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
This commit is contained in:
Alyssa Ross 2023-10-27 15:10:53 +02:00 committed by Hector Martin
parent 8bdfdb7ce8
commit 93cce40476
1 changed files with 19 additions and 1 deletions
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20
proxyclient/m1n1/adt.py
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@ -232,6 +232,20 @@ DAPFT8110B = Struct(
"pad" / Hex(Int32ul),
)
DAPFT8110C = Struct(
"start" / Hex(Int64ul),
"end" / Hex(Int64ul),
"r20" / Hex(Int32ul),
"unk1" / Hex(Int32ul),
"r4" / Hex(Int32ul),
"unk2" / Array(5, Hex(Int32ul)),
"unk3" / Hex(Int8ul),
"r0h" / Hex(Int8ul),
"r0l" / Hex(Int8ul),
"unk4" / Hex(Int8ul),
"pad" / Array(3, Hex(Int8ul)),
)
DEV_PROPERTIES = {
"pmgr": {
"*": {
@ -412,7 +426,11 @@ def parse_prop(node, path, node_name, name, v, is_template=False):
except AttributeError:
return None, v
if flags & 0x40:
t = GreedyRange(DAPFT8110B)
if len(v) % DAPFT8110B.sizeof() == 0:
if len(v) % DAPFT8110C.sizeof() != 0:
t = GreedyRange(DAPFT8110B)
else:
t = GreedyRange(DAPFT8110C)
else:
t = GreedyRange(DAPFT8110)