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S16v3: add sp un-leak

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SashegDev
2026-09-13 12:13:59 +00:00
parent 9cd903c34d
commit 80ee6d1bf3
3 changed files with 20 additions and 14 deletions
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tools/sbl_uni.py
+7 -5
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@@ -393,12 +393,14 @@ def main():
mu.mem_write(0x08006964, bytes.fromhex(
"04c09de50c309fe5002093e5022082e3002083e51eff2fe1"
"00a17300"))
# S16-stublet (b25, 44B @0x08006CC0): smart return for B66 bx ip.
# ip odd + top 8 (DDRLOW/DDRHIGH code) => bx ip (legit pushed-lr
# return); else default (restore r7, jump poll resumption 0x8007779).
# S16-stublet (b27, 50B @0x08006CC0): smart return for B66 bx ip.
# ip odd + top 8 (code) => add sp,#8 (pop the helper frame it
# skipped!) + bx ip (legit pushed-lr return, un-leaks the stack);
# else default (restore r7, jump poll resumption 0x8007779).
mu.mem_write(0x08006CC0, bytes.fromhex(
"1cf0010f09d05fea1c63082b00d160475fea1c73082b00d"
"160474af20007c0f2730747f2797cc0f6000c6047"))
"ddf804c01cf0010f0bd05fea1c63082b00d102b06047"
"5fea1c73082b00d160474af20007c0f2730747f2797c"
"c0f6000c6047"))
# stack zone fill (STUBV odd)
mu.mem_write(0x085F0000, struct.pack("<I", STUBV) * (0x10000 // 4))
# pop-site slots (sp values from traces)