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fix(relinker): decode XOP instructions

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The x86 decoder had no XOP (AMD 8F escape) support and read 8F E8.. as
POP r/m, losing instruction boundaries. Since #2238 roots code addresses
taken by RIP-relative LEA, code analysis reaches CPU-dispatched XOP
paths, such as the vpperm routines in Stremio Plus (PPSA74126), OpenNOW
(PPSA99082) and PPSA99420, and their Windows conversion failed with
"Code analysis: overlapping instruction boundaries". Decode 8F followed
by a map of 8 or more as a three-byte XOP prefix (8F can only be POP r/m
with ModRM.reg 0) with a ModRM operand, an 8-bit immediate in map 8 and
a 32-bit immediate in map 0Ah, in both the length and operand decoders.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Achraf ReyaniandClaude Opus 5.5 authored and Dean Galvin committed 2026-10-10 19:27:24 +13:00
1 parent 23ed501f4a
commit ce8dbc977f
3 files changed
+30 -7
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core/relinker/codegen/include/codegen/x86/X64OpcodeConstants.hpp
+4
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@@ -220,6 +220,10 @@ inline constexpr std::size_t Vex2PrefixLength = 2;
inline constexpr std::size_t Vex3PrefixLength = 3;
inline constexpr std::uint8_t Vex3MapMask = 0x1F;
inline constexpr std::uint8_t Vex3Map0F3A = 0x03;
inline constexpr std::uint8_t XopPrefix = 0x8F;
inline constexpr std::uint8_t XopMapMin = 0x08;
inline constexpr std::uint8_t XopMap8 = 0x08;
inline constexpr std::uint8_t XopMapA = 0x0A;
}