Merge pull request #144 from rakslice/emaculation_x64_32_instruction_…

…skip Add x86_64 32-bit address mode prefix to ix86_skip_instruction
emaculation · Dec 3, 2020 · b0a8453 · b0a8453
2 parents af55889 + 66a3122
commit b0a8453
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diff --git a/BasiliskII/src/CrossPlatform/sigsegv.cpp b/BasiliskII/src/CrossPlatform/sigsegv.cpp
@@ -1018,6 +1018,15 @@ static bool ix86_skip_instruction(SIGSEGV_REGISTER_TYPE * regs)
 		transfer_size = SIZE_WORD;
 	}
 
+#if defined(__x86_64__) || defined(_M_X64)
+	// Address size override
+	if (*eip == 0x67) {
+		// 32-bit address
+		eip++;
+		len++;
+	}
+#endif
+
 	// REX prefix
 #if defined(__x86_64__) || defined(_M_X64)
 	struct rex_t {

diff --git a/SheepShaver/src/CrossPlatform/sigsegv.cpp b/SheepShaver/src/CrossPlatform/sigsegv.cpp
@@ -1018,6 +1018,15 @@ static bool ix86_skip_instruction(SIGSEGV_REGISTER_TYPE * regs)
 		transfer_size = SIZE_WORD;
 	}
 
+#if defined(__x86_64__) || defined(_M_X64)
+	// Address size override
+	if (*eip == 0x67) {
+		// 32-bit address
+		eip++;
+		len++;
+	}
+#endif
+
 	// REX prefix
 #if defined(__x86_64__) || defined(_M_X64)
 	struct rex_t {