Description: fix JSCore segmentation fault on 64-bit big endian systems In CodeBlock.cpp the code preparing the operands of op_get_from_scope writes the property offset as pointer size (hence 64 bit) value: . 2141: instructions[i + 6].u.pointer = reinterpret_cast<void*>(op.operand); . while the same slot is accessed later by the jitted code as 32 bit integer: . macro getProperty(slow) loadisFromInstruction(6, t1) . This fails on big endian targets since the integer access takes the higher part of the 64 bit value. Origin: backport, https://github.com/webkit/webkit/commit/3fdde71c7d95d758 Reviewed-by: Frank Heimes <frank.heimes@canonical.com> Last-Update: 2021-11-24 --- a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm +++ b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm @@ -2020,7 +2020,7 @@ macro loadWithStructureCheck(operand, sl end macro getProperty(slow) - loadisFromInstruction(6, t1) + loadpFromInstruction(6, t1) loadPropertyAtVariableOffset(t1, t0, t2, slow) valueProfile(t2, 7, t0) loadisFromInstruction(1, t0)