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Fix SSE4a EXTRQ/INSERTQ register form

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This commit is contained in:
neobugs1
2026-07-29 22:51:53 +02:00
parent cb7a083b78
commit ea2b54a4d0
1 changed files with 94 additions and 12 deletions
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src/loader/x64InstructionEmulator.cpp
+94 -12
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@@ -413,22 +413,44 @@ static bool TryEmulateSse4a(PCONTEXT context) {
return false; return false;
} }
const uint8_t reg = ((modrm >> 3u) & 0x07u) | ((rex & 0x04u) << 1u); const uint8_t reg = ((modrm >> 3u) & 0x07u) | ((rex & 0x04u) << 1u);
const uint8_t rm = (modrm & 0x07u) | ((rex & 0x01u) << 3u); const uint8_t rm = (modrm & 0x07u) | ((rex & 0x01u) << 3u);
const uint8_t length = rip[offset + 3];
const uint8_t index = rip[offset + 4];
// AMD SSE4a immediate-form EXTRQ/INSERTQ. PS5 code can execute these natively on AMD hardware, // AMD SSE4a immediate-form EXTRQ/INSERTQ. PS5 code can execute these natively on AMD hardware,
// while Intel hosts raise an illegal-instruction exception. // while Intel hosts raise an illegal-instruction exception.
const bool immediate_form = (reg == 0);
if (prefix == 0x66) { if (prefix == 0x66) {
auto* dst = GetContextXmm(context, rm); auto* dst = GetContextXmm(context, rm);
if (dst == nullptr) { if (dst == nullptr) {
return false; return false;
} }
uint8_t length = 0;
uint8_t index = 0;
size_t insn_length = 0;
if (immediate_form) {
length = rip[offset + 3];
index = rip[offset + 4];
insn_length = offset + 5;
} else {
auto* src = GetContextXmm(context, reg);
if (src == nullptr) {
return false;
}
length = static_cast<uint8_t>(src->Low & 0x3fu);
index = static_cast<uint8_t>((src->Low >> 6u) & 0x3fu);
insn_length = offset + 3;
}
if (length == 0) {
length = 64;
}
dst->Low = ExtractBitField(dst->Low, length, index); dst->Low = ExtractBitField(dst->Low, length, index);
dst->High = 0; dst->High = 0;
context->Rip += offset + 5; context->Rip += insn_length;
return true; return true;
} }
@@ -438,8 +460,26 @@ static bool TryEmulateSse4a(PCONTEXT context) {
return false; return false;
} }
uint8_t length = 0;
uint8_t index = 0;
size_t insn_length = 0;
if (immediate_form) {
length = rip[offset + 3];
index = rip[offset + 4];
insn_length = offset + 5;
} else {
length = static_cast<uint8_t>(src->Low & 0x3fu);
index = static_cast<uint8_t>((src->Low >> 6u) & 0x3fu);
insn_length = offset + 3;
}
if (length == 0) {
length = 64;
}
dst->Low = InsertBitField(dst->Low, src->Low, length, index); dst->Low = InsertBitField(dst->Low, src->Low, length, index);
context->Rip += offset + 5; context->Rip += insn_length;
return true; return true;
} }
@@ -579,21 +619,44 @@ static bool TryEmulateSse4a(ucontext_t* context) {
return false; return false;
} }
const uint8_t reg = ((modrm >> 3u) & 0x07u) | ((rex & 0x04u) << 1u); const uint8_t reg = ((modrm >> 3u) & 0x07u) | ((rex & 0x04u) << 1u);
const uint8_t rm = (modrm & 0x07u) | ((rex & 0x01u) << 3u); const uint8_t rm = (modrm & 0x07u) | ((rex & 0x01u) << 3u);
const uint8_t length = rip[offset + 3];
const uint8_t index = rip[offset + 4];
// AMD SSE4a immediate-form EXTRQ/INSERTQ. // AMD SSE4a immediate-form EXTRQ/INSERTQ.
const bool immediate_form = (reg == 0);
if (prefix == 0x66) { if (prefix == 0x66) {
auto* dst = GetContextXmm(context, rm); auto* dst = GetContextXmm(context, rm);
if (dst == nullptr) { if (dst == nullptr) {
return false; return false;
} }
uint8_t length = 0;
uint8_t index = 0;
size_t insn_len = 0;
if (immediate_form) {
length = rip[offset + 3];
index = rip[offset + 4];
insn_len = offset + 5;
} else {
auto* src = GetContextXmm(context, reg);
if (src == nullptr) {
return false;
}
const uint64_t src_low = GetXmmLow(src);
length = static_cast<uint8_t>(src_low & 0x3fu);
index = static_cast<uint8_t>((src_low >> 6u) & 0x3fu);
insn_len = offset + 3;
}
if (length == 0) {
length = 64;
}
SetXmmLow(dst, ExtractBitField(GetXmmLow(dst), length, index)); SetXmmLow(dst, ExtractBitField(GetXmmLow(dst), length, index));
SetXmmHigh(dst, 0); SetXmmHigh(dst, 0);
rip_reg += static_cast<greg_t>(offset + 5); rip_reg += static_cast<greg_t>(insn_len);
return true; return true;
} }
@@ -603,8 +666,27 @@ static bool TryEmulateSse4a(ucontext_t* context) {
return false; return false;
} }
uint8_t length = 0;
uint8_t index = 0;
size_t insn_len = 0;
if (immediate_form) {
length = rip[offset + 3];
index = rip[offset + 4];
insn_len = offset + 5;
} else {
const uint64_t src_low = GetXmmLow(src);
length = static_cast<uint8_t>(src_low & 0x3fu);
index = static_cast<uint8_t>((src_low >> 6u) & 0x3fu);
insn_len = offset + 3;
}
if (length == 0) {
length = 64;
}
SetXmmLow(dst, InsertBitField(GetXmmLow(dst), GetXmmLow(src), length, index)); SetXmmLow(dst, InsertBitField(GetXmmLow(dst), GetXmmLow(src), length, index));
rip_reg += static_cast<greg_t>(offset + 5); rip_reg += static_cast<greg_t>(insn_len);
return true; return true;
} }