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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)
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